1454 lines
58 KiB
Java
1454 lines
58 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import com.android.internal.R;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.View;
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import android.view.ViewDebug;
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import android.view.ViewGroup;
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import android.widget.RemoteViews.RemoteView;
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/**
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* A Layout that arranges its children in a single column or a single row. The direction of
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* the row can be set by calling {@link #setOrientation(int) setOrientation()}.
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* You can also specify gravity, which specifies the alignment of all the child elements by
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* calling {@link #setGravity(int) setGravity()} or specify that specific children
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* grow to fill up any remaining space in the layout by setting the <em>weight</em> member of
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* {@link android.widget.LinearLayout.LayoutParams LinearLayout.LayoutParams}.
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* The default orientation is horizontal.
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*
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* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-linearlayout.html">Linear Layout
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* tutorial</a>.</p>
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*
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* <p>
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* Also see {@link LinearLayout.LayoutParams android.widget.LinearLayout.LayoutParams}
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* for layout attributes </p>
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*/
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@RemoteView
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public class LinearLayout extends ViewGroup {
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public static final int HORIZONTAL = 0;
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public static final int VERTICAL = 1;
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/**
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* Whether the children of this layout are baseline aligned. Only applicable
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* if {@link #mOrientation} is horizontal.
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*/
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@ViewDebug.ExportedProperty(category = "layout")
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private boolean mBaselineAligned = true;
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/**
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* If this layout is part of another layout that is baseline aligned,
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* use the child at this index as the baseline.
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*
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* Note: this is orthogonal to {@link #mBaselineAligned}, which is concerned
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* with whether the children of this layout are baseline aligned.
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*/
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@ViewDebug.ExportedProperty(category = "layout")
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private int mBaselineAlignedChildIndex = -1;
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/**
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* The additional offset to the child's baseline.
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* We'll calculate the baseline of this layout as we measure vertically; for
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* horizontal linear layouts, the offset of 0 is appropriate.
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*/
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@ViewDebug.ExportedProperty(category = "measurement")
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private int mBaselineChildTop = 0;
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@ViewDebug.ExportedProperty(category = "measurement")
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private int mOrientation;
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@ViewDebug.ExportedProperty(category = "measurement", mapping = {
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@ViewDebug.IntToString(from = -1, to = "NONE"),
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@ViewDebug.IntToString(from = Gravity.NO_GRAVITY, to = "NONE"),
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@ViewDebug.IntToString(from = Gravity.TOP, to = "TOP"),
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@ViewDebug.IntToString(from = Gravity.BOTTOM, to = "BOTTOM"),
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@ViewDebug.IntToString(from = Gravity.LEFT, to = "LEFT"),
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@ViewDebug.IntToString(from = Gravity.RIGHT, to = "RIGHT"),
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@ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL, to = "CENTER_VERTICAL"),
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@ViewDebug.IntToString(from = Gravity.FILL_VERTICAL, to = "FILL_VERTICAL"),
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@ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"),
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@ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL, to = "FILL_HORIZONTAL"),
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@ViewDebug.IntToString(from = Gravity.CENTER, to = "CENTER"),
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@ViewDebug.IntToString(from = Gravity.FILL, to = "FILL")
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})
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private int mGravity = Gravity.LEFT | Gravity.TOP;
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@ViewDebug.ExportedProperty(category = "measurement")
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private int mTotalLength;
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@ViewDebug.ExportedProperty(category = "layout")
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private float mWeightSum;
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@ViewDebug.ExportedProperty(category = "layout")
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private boolean mUseLargestChild;
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private int[] mMaxAscent;
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private int[] mMaxDescent;
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private static final int VERTICAL_GRAVITY_COUNT = 4;
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private static final int INDEX_CENTER_VERTICAL = 0;
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private static final int INDEX_TOP = 1;
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private static final int INDEX_BOTTOM = 2;
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private static final int INDEX_FILL = 3;
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public LinearLayout(Context context) {
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super(context);
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}
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public LinearLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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TypedArray a =
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context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.LinearLayout);
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int index = a.getInt(com.android.internal.R.styleable.LinearLayout_orientation, -1);
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if (index >= 0) {
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setOrientation(index);
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}
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index = a.getInt(com.android.internal.R.styleable.LinearLayout_gravity, -1);
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if (index >= 0) {
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setGravity(index);
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}
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boolean baselineAligned = a.getBoolean(R.styleable.LinearLayout_baselineAligned, true);
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if (!baselineAligned) {
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setBaselineAligned(baselineAligned);
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}
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mWeightSum = a.getFloat(R.styleable.LinearLayout_weightSum, -1.0f);
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mBaselineAlignedChildIndex =
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a.getInt(com.android.internal.R.styleable.LinearLayout_baselineAlignedChildIndex, -1);
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// TODO: Better name, add Java APIs, make it public
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mUseLargestChild = a.getBoolean(R.styleable.LinearLayout_useLargestChild, false);
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a.recycle();
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}
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/**
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* <p>Indicates whether widgets contained within this layout are aligned
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* on their baseline or not.</p>
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*
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* @return true when widgets are baseline-aligned, false otherwise
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*/
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public boolean isBaselineAligned() {
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return mBaselineAligned;
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}
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/**
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* <p>Defines whether widgets contained in this layout are
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* baseline-aligned or not.</p>
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*
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* @param baselineAligned true to align widgets on their baseline,
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* false otherwise
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*
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* @attr ref android.R.styleable#LinearLayout_baselineAligned
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*/
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@android.view.RemotableViewMethod
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public void setBaselineAligned(boolean baselineAligned) {
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mBaselineAligned = baselineAligned;
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}
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@Override
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public int getBaseline() {
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if (mBaselineAlignedChildIndex < 0) {
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return super.getBaseline();
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}
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if (getChildCount() <= mBaselineAlignedChildIndex) {
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throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout "
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+ "set to an index that is out of bounds.");
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}
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final View child = getChildAt(mBaselineAlignedChildIndex);
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final int childBaseline = child.getBaseline();
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if (childBaseline == -1) {
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if (mBaselineAlignedChildIndex == 0) {
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// this is just the default case, safe to return -1
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return -1;
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}
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// the user picked an index that points to something that doesn't
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// know how to calculate its baseline.
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throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout "
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+ "points to a View that doesn't know how to get its baseline.");
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}
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// TODO: This should try to take into account the virtual offsets
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// (See getNextLocationOffset and getLocationOffset)
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// We should add to childTop:
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// sum([getNextLocationOffset(getChildAt(i)) / i < mBaselineAlignedChildIndex])
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// and also add:
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// getLocationOffset(child)
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int childTop = mBaselineChildTop;
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if (mOrientation == VERTICAL) {
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final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
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if (majorGravity != Gravity.TOP) {
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switch (majorGravity) {
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case Gravity.BOTTOM:
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childTop = mBottom - mTop - mPaddingBottom - mTotalLength;
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break;
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case Gravity.CENTER_VERTICAL:
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childTop += ((mBottom - mTop - mPaddingTop - mPaddingBottom) -
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mTotalLength) / 2;
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break;
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}
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}
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}
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LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams();
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return childTop + lp.topMargin + childBaseline;
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}
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/**
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* @return The index of the child that will be used if this layout is
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* part of a larger layout that is baseline aligned, or -1 if none has
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* been set.
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*/
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public int getBaselineAlignedChildIndex() {
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return mBaselineAlignedChildIndex;
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}
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/**
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* @param i The index of the child that will be used if this layout is
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* part of a larger layout that is baseline aligned.
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*
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* @attr ref android.R.styleable#LinearLayout_baselineAlignedChildIndex
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*/
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@android.view.RemotableViewMethod
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public void setBaselineAlignedChildIndex(int i) {
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if ((i < 0) || (i >= getChildCount())) {
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throw new IllegalArgumentException("base aligned child index out "
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+ "of range (0, " + getChildCount() + ")");
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}
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mBaselineAlignedChildIndex = i;
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}
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/**
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* <p>Returns the view at the specified index. This method can be overriden
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* to take into account virtual children. Refer to
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* {@link android.widget.TableLayout} and {@link android.widget.TableRow}
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* for an example.</p>
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*
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* @param index the child's index
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* @return the child at the specified index
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*/
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View getVirtualChildAt(int index) {
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return getChildAt(index);
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}
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/**
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* <p>Returns the virtual number of children. This number might be different
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* than the actual number of children if the layout can hold virtual
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* children. Refer to
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* {@link android.widget.TableLayout} and {@link android.widget.TableRow}
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* for an example.</p>
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*
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* @return the virtual number of children
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*/
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int getVirtualChildCount() {
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return getChildCount();
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}
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/**
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* Returns the desired weights sum.
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*
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* @return A number greater than 0.0f if the weight sum is defined, or
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* a number lower than or equals to 0.0f if not weight sum is
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* to be used.
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*/
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public float getWeightSum() {
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return mWeightSum;
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}
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/**
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* Defines the desired weights sum. If unspecified the weights sum is computed
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* at layout time by adding the layout_weight of each child.
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*
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* This can be used for instance to give a single child 50% of the total
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* available space by giving it a layout_weight of 0.5 and setting the
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* weightSum to 1.0.
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*
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* @param weightSum a number greater than 0.0f, or a number lower than or equals
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* to 0.0f if the weight sum should be computed from the children's
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* layout_weight
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*/
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@android.view.RemotableViewMethod
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public void setWeightSum(float weightSum) {
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mWeightSum = Math.max(0.0f, weightSum);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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if (mOrientation == VERTICAL) {
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measureVertical(widthMeasureSpec, heightMeasureSpec);
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} else {
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measureHorizontal(widthMeasureSpec, heightMeasureSpec);
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}
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}
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/**
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* Measures the children when the orientation of this LinearLayout is set
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* to {@link #VERTICAL}.
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*
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* @param widthMeasureSpec Horizontal space requirements as imposed by the parent.
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* @param heightMeasureSpec Vertical space requirements as imposed by the parent.
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*
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* @see #getOrientation()
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* @see #setOrientation(int)
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* @see #onMeasure(int, int)
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*/
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void measureVertical(int widthMeasureSpec, int heightMeasureSpec) {
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mTotalLength = 0;
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int maxWidth = 0;
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int alternativeMaxWidth = 0;
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int weightedMaxWidth = 0;
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boolean allFillParent = true;
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float totalWeight = 0;
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final int count = getVirtualChildCount();
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final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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boolean matchWidth = false;
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final int baselineChildIndex = mBaselineAlignedChildIndex;
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final boolean useLargestChild = mUseLargestChild;
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int largestChildHeight = Integer.MIN_VALUE;
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// See how tall everyone is. Also remember max width.
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for (int i = 0; i < count; ++i) {
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final View child = getVirtualChildAt(i);
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if (child == null) {
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mTotalLength += measureNullChild(i);
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continue;
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}
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if (child.getVisibility() == View.GONE) {
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i += getChildrenSkipCount(child, i);
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continue;
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}
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LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams();
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totalWeight += lp.weight;
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if (heightMode == MeasureSpec.EXACTLY && lp.height == 0 && lp.weight > 0) {
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// Optimization: don't bother measuring children who are going to use
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// leftover space. These views will get measured again down below if
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// there is any leftover space.
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final int totalLength = mTotalLength;
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mTotalLength = Math.max(totalLength, totalLength + lp.topMargin + lp.bottomMargin);
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} else {
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int oldHeight = Integer.MIN_VALUE;
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if (lp.height == 0 && lp.weight > 0) {
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// heightMode is either UNSPECIFIED or AT_MOST, and this
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// child wanted to stretch to fill available space.
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// Translate that to WRAP_CONTENT so that it does not end up
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// with a height of 0
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oldHeight = 0;
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lp.height = LayoutParams.WRAP_CONTENT;
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}
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// Determine how big this child would like to be. If this or
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// previous children have given a weight, then we allow it to
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// use all available space (and we will shrink things later
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// if needed).
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measureChildBeforeLayout(
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child, i, widthMeasureSpec, 0, heightMeasureSpec,
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totalWeight == 0 ? mTotalLength : 0);
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if (oldHeight != Integer.MIN_VALUE) {
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lp.height = oldHeight;
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}
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final int childHeight = child.getMeasuredHeight();
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final int totalLength = mTotalLength;
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mTotalLength = Math.max(totalLength, totalLength + childHeight + lp.topMargin +
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lp.bottomMargin + getNextLocationOffset(child));
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if (useLargestChild) {
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largestChildHeight = Math.max(childHeight, largestChildHeight);
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}
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}
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/**
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* If applicable, compute the additional offset to the child's baseline
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* we'll need later when asked {@link #getBaseline}.
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*/
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if ((baselineChildIndex >= 0) && (baselineChildIndex == i + 1)) {
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mBaselineChildTop = mTotalLength;
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}
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// if we are trying to use a child index for our baseline, the above
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// book keeping only works if there are no children above it with
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// weight. fail fast to aid the developer.
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if (i < baselineChildIndex && lp.weight > 0) {
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throw new RuntimeException("A child of LinearLayout with index "
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+ "less than mBaselineAlignedChildIndex has weight > 0, which "
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+ "won't work. Either remove the weight, or don't set "
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+ "mBaselineAlignedChildIndex.");
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}
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boolean matchWidthLocally = false;
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if (widthMode != MeasureSpec.EXACTLY && lp.width == LayoutParams.MATCH_PARENT) {
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// The width of the linear layout will scale, and at least one
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// child said it wanted to match our width. Set a flag
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// indicating that we need to remeasure at least that view when
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// we know our width.
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matchWidth = true;
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matchWidthLocally = true;
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}
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final int margin = lp.leftMargin + lp.rightMargin;
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final int measuredWidth = child.getMeasuredWidth() + margin;
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maxWidth = Math.max(maxWidth, measuredWidth);
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allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT;
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if (lp.weight > 0) {
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/*
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* Widths of weighted Views are bogus if we end up
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* remeasuring, so keep them separate.
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*/
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weightedMaxWidth = Math.max(weightedMaxWidth,
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matchWidthLocally ? margin : measuredWidth);
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} else {
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alternativeMaxWidth = Math.max(alternativeMaxWidth,
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matchWidthLocally ? margin : measuredWidth);
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}
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i += getChildrenSkipCount(child, i);
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}
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if (useLargestChild && heightMode == MeasureSpec.AT_MOST) {
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mTotalLength = 0;
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for (int i = 0; i < count; ++i) {
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final View child = getVirtualChildAt(i);
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if (child == null) {
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mTotalLength += measureNullChild(i);
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continue;
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}
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if (child.getVisibility() == GONE) {
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i += getChildrenSkipCount(child, i);
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continue;
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}
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final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)
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child.getLayoutParams();
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// Account for negative margins
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final int totalLength = mTotalLength;
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mTotalLength = Math.max(totalLength, totalLength + largestChildHeight +
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lp.topMargin + lp.bottomMargin + getNextLocationOffset(child));
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}
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}
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// Add in our padding
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mTotalLength += mPaddingTop + mPaddingBottom;
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int heightSize = mTotalLength;
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// Check against our minimum height
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heightSize = Math.max(heightSize, getSuggestedMinimumHeight());
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// Reconcile our calculated size with the heightMeasureSpec
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heightSize = resolveSize(heightSize, heightMeasureSpec);
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// Either expand children with weight to take up available space or
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// shrink them if they extend beyond our current bounds
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int delta = heightSize - mTotalLength;
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if (delta != 0 && totalWeight > 0.0f) {
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float weightSum = mWeightSum > 0.0f ? mWeightSum : totalWeight;
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mTotalLength = 0;
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for (int i = 0; i < count; ++i) {
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final View child = getVirtualChildAt(i);
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if (child.getVisibility() == View.GONE) {
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continue;
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}
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LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams();
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float childExtra = lp.weight;
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if (childExtra > 0) {
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// Child said it could absorb extra space -- give him his share
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int share = (int) (childExtra * delta / weightSum);
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weightSum -= childExtra;
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delta -= share;
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final int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
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mPaddingLeft + mPaddingRight +
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lp.leftMargin + lp.rightMargin, lp.width);
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|
|
// TODO: Use a field like lp.isMeasured to figure out if this
|
|
// child has been previously measured
|
|
if ((lp.height != 0) || (heightMode != MeasureSpec.EXACTLY)) {
|
|
// child was measured once already above...
|
|
// base new measurement on stored values
|
|
int childHeight = child.getMeasuredHeight() + share;
|
|
if (childHeight < 0) {
|
|
childHeight = 0;
|
|
}
|
|
|
|
child.measure(childWidthMeasureSpec,
|
|
MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
|
|
} else {
|
|
// child was skipped in the loop above.
|
|
// Measure for this first time here
|
|
child.measure(childWidthMeasureSpec,
|
|
MeasureSpec.makeMeasureSpec(share > 0 ? share : 0,
|
|
MeasureSpec.EXACTLY));
|
|
}
|
|
}
|
|
|
|
final int margin = lp.leftMargin + lp.rightMargin;
|
|
final int measuredWidth = child.getMeasuredWidth() + margin;
|
|
maxWidth = Math.max(maxWidth, measuredWidth);
|
|
|
|
boolean matchWidthLocally = widthMode != MeasureSpec.EXACTLY &&
|
|
lp.width == LayoutParams.MATCH_PARENT;
|
|
|
|
alternativeMaxWidth = Math.max(alternativeMaxWidth,
|
|
matchWidthLocally ? margin : measuredWidth);
|
|
|
|
allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT;
|
|
|
|
final int totalLength = mTotalLength;
|
|
mTotalLength = Math.max(totalLength, totalLength + child.getMeasuredHeight() +
|
|
lp.topMargin + lp.bottomMargin + getNextLocationOffset(child));
|
|
}
|
|
|
|
// Add in our padding
|
|
mTotalLength += mPaddingTop + mPaddingBottom;
|
|
// TODO: Should we recompute the heightSpec based on the new total length?
|
|
} else {
|
|
alternativeMaxWidth = Math.max(alternativeMaxWidth,
|
|
weightedMaxWidth);
|
|
}
|
|
|
|
if (!allFillParent && widthMode != MeasureSpec.EXACTLY) {
|
|
maxWidth = alternativeMaxWidth;
|
|
}
|
|
|
|
maxWidth += mPaddingLeft + mPaddingRight;
|
|
|
|
// Check against our minimum width
|
|
maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
|
|
|
|
setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec), heightSize);
|
|
|
|
if (matchWidth) {
|
|
forceUniformWidth(count, heightMeasureSpec);
|
|
}
|
|
}
|
|
|
|
private void forceUniformWidth(int count, int heightMeasureSpec) {
|
|
// Pretend that the linear layout has an exact size.
|
|
int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(),
|
|
MeasureSpec.EXACTLY);
|
|
for (int i = 0; i< count; ++i) {
|
|
final View child = getVirtualChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
LinearLayout.LayoutParams lp = ((LinearLayout.LayoutParams)child.getLayoutParams());
|
|
|
|
if (lp.width == LayoutParams.MATCH_PARENT) {
|
|
// Temporarily force children to reuse their old measured height
|
|
// FIXME: this may not be right for something like wrapping text?
|
|
int oldHeight = lp.height;
|
|
lp.height = child.getMeasuredHeight();
|
|
|
|
// Remeasue with new dimensions
|
|
measureChildWithMargins(child, uniformMeasureSpec, 0, heightMeasureSpec, 0);
|
|
lp.height = oldHeight;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Measures the children when the orientation of this LinearLayout is set
|
|
* to {@link #HORIZONTAL}.
|
|
*
|
|
* @param widthMeasureSpec Horizontal space requirements as imposed by the parent.
|
|
* @param heightMeasureSpec Vertical space requirements as imposed by the parent.
|
|
*
|
|
* @see #getOrientation()
|
|
* @see #setOrientation(int)
|
|
* @see #onMeasure(int, int)
|
|
*/
|
|
void measureHorizontal(int widthMeasureSpec, int heightMeasureSpec) {
|
|
mTotalLength = 0;
|
|
int maxHeight = 0;
|
|
int alternativeMaxHeight = 0;
|
|
int weightedMaxHeight = 0;
|
|
boolean allFillParent = true;
|
|
float totalWeight = 0;
|
|
|
|
final int count = getVirtualChildCount();
|
|
|
|
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
|
|
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
|
|
|
|
boolean matchHeight = false;
|
|
|
|
if (mMaxAscent == null || mMaxDescent == null) {
|
|
mMaxAscent = new int[VERTICAL_GRAVITY_COUNT];
|
|
mMaxDescent = new int[VERTICAL_GRAVITY_COUNT];
|
|
}
|
|
|
|
final int[] maxAscent = mMaxAscent;
|
|
final int[] maxDescent = mMaxDescent;
|
|
|
|
maxAscent[0] = maxAscent[1] = maxAscent[2] = maxAscent[3] = -1;
|
|
maxDescent[0] = maxDescent[1] = maxDescent[2] = maxDescent[3] = -1;
|
|
|
|
final boolean baselineAligned = mBaselineAligned;
|
|
final boolean useLargestChild = mUseLargestChild;
|
|
|
|
final boolean isExactly = widthMode == MeasureSpec.EXACTLY;
|
|
|
|
int largestChildWidth = Integer.MIN_VALUE;
|
|
|
|
// See how wide everyone is. Also remember max height.
|
|
for (int i = 0; i < count; ++i) {
|
|
final View child = getVirtualChildAt(i);
|
|
|
|
if (child == null) {
|
|
mTotalLength += measureNullChild(i);
|
|
continue;
|
|
}
|
|
|
|
if (child.getVisibility() == GONE) {
|
|
i += getChildrenSkipCount(child, i);
|
|
continue;
|
|
}
|
|
|
|
final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)
|
|
child.getLayoutParams();
|
|
|
|
totalWeight += lp.weight;
|
|
|
|
if (widthMode == MeasureSpec.EXACTLY && lp.width == 0 && lp.weight > 0) {
|
|
// Optimization: don't bother measuring children who are going to use
|
|
// leftover space. These views will get measured again down below if
|
|
// there is any leftover space.
|
|
if (isExactly) {
|
|
mTotalLength += lp.leftMargin + lp.rightMargin;
|
|
} else {
|
|
final int totalLength = mTotalLength;
|
|
mTotalLength = Math.max(totalLength, totalLength +
|
|
lp.leftMargin + lp.rightMargin);
|
|
}
|
|
|
|
// Baseline alignment requires to measure widgets to obtain the
|
|
// baseline offset (in particular for TextViews). The following
|
|
// defeats the optimization mentioned above. Allow the child to
|
|
// use as much space as it wants because we can shrink things
|
|
// later (and re-measure).
|
|
if (baselineAligned) {
|
|
final int freeSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
|
|
child.measure(freeSpec, freeSpec);
|
|
}
|
|
} else {
|
|
int oldWidth = Integer.MIN_VALUE;
|
|
|
|
if (lp.width == 0 && lp.weight > 0) {
|
|
// widthMode is either UNSPECIFIED or AT_MOST, and this
|
|
// child
|
|
// wanted to stretch to fill available space. Translate that to
|
|
// WRAP_CONTENT so that it does not end up with a width of 0
|
|
oldWidth = 0;
|
|
lp.width = LayoutParams.WRAP_CONTENT;
|
|
}
|
|
|
|
// Determine how big this child would like to be. If this or
|
|
// previous children have given a weight, then we allow it to
|
|
// use all available space (and we will shrink things later
|
|
// if needed).
|
|
measureChildBeforeLayout(child, i, widthMeasureSpec,
|
|
totalWeight == 0 ? mTotalLength : 0,
|
|
heightMeasureSpec, 0);
|
|
|
|
if (oldWidth != Integer.MIN_VALUE) {
|
|
lp.width = oldWidth;
|
|
}
|
|
|
|
final int childWidth = child.getMeasuredWidth();
|
|
if (isExactly) {
|
|
mTotalLength += childWidth + lp.leftMargin + lp.rightMargin +
|
|
getNextLocationOffset(child);
|
|
} else {
|
|
final int totalLength = mTotalLength;
|
|
mTotalLength = Math.max(totalLength, totalLength + childWidth + lp.leftMargin +
|
|
lp.rightMargin + getNextLocationOffset(child));
|
|
}
|
|
|
|
if (useLargestChild) {
|
|
largestChildWidth = Math.max(childWidth, largestChildWidth);
|
|
}
|
|
}
|
|
|
|
boolean matchHeightLocally = false;
|
|
if (heightMode != MeasureSpec.EXACTLY && lp.height == LayoutParams.MATCH_PARENT) {
|
|
// The height of the linear layout will scale, and at least one
|
|
// child said it wanted to match our height. Set a flag indicating that
|
|
// we need to remeasure at least that view when we know our height.
|
|
matchHeight = true;
|
|
matchHeightLocally = true;
|
|
}
|
|
|
|
final int margin = lp.topMargin + lp.bottomMargin;
|
|
final int childHeight = child.getMeasuredHeight() + margin;
|
|
|
|
if (baselineAligned) {
|
|
final int childBaseline = child.getBaseline();
|
|
if (childBaseline != -1) {
|
|
// Translates the child's vertical gravity into an index
|
|
// in the range 0..VERTICAL_GRAVITY_COUNT
|
|
final int gravity = (lp.gravity < 0 ? mGravity : lp.gravity)
|
|
& Gravity.VERTICAL_GRAVITY_MASK;
|
|
final int index = ((gravity >> Gravity.AXIS_Y_SHIFT)
|
|
& ~Gravity.AXIS_SPECIFIED) >> 1;
|
|
|
|
maxAscent[index] = Math.max(maxAscent[index], childBaseline);
|
|
maxDescent[index] = Math.max(maxDescent[index], childHeight - childBaseline);
|
|
}
|
|
}
|
|
|
|
maxHeight = Math.max(maxHeight, childHeight);
|
|
|
|
allFillParent = allFillParent && lp.height == LayoutParams.MATCH_PARENT;
|
|
if (lp.weight > 0) {
|
|
/*
|
|
* Heights of weighted Views are bogus if we end up
|
|
* remeasuring, so keep them separate.
|
|
*/
|
|
weightedMaxHeight = Math.max(weightedMaxHeight,
|
|
matchHeightLocally ? margin : childHeight);
|
|
} else {
|
|
alternativeMaxHeight = Math.max(alternativeMaxHeight,
|
|
matchHeightLocally ? margin : childHeight);
|
|
}
|
|
|
|
i += getChildrenSkipCount(child, i);
|
|
}
|
|
|
|
// Check mMaxAscent[INDEX_TOP] first because it maps to Gravity.TOP,
|
|
// the most common case
|
|
if (maxAscent[INDEX_TOP] != -1 ||
|
|
maxAscent[INDEX_CENTER_VERTICAL] != -1 ||
|
|
maxAscent[INDEX_BOTTOM] != -1 ||
|
|
maxAscent[INDEX_FILL] != -1) {
|
|
final int ascent = Math.max(maxAscent[INDEX_FILL],
|
|
Math.max(maxAscent[INDEX_CENTER_VERTICAL],
|
|
Math.max(maxAscent[INDEX_TOP], maxAscent[INDEX_BOTTOM])));
|
|
final int descent = Math.max(maxDescent[INDEX_FILL],
|
|
Math.max(maxDescent[INDEX_CENTER_VERTICAL],
|
|
Math.max(maxDescent[INDEX_TOP], maxDescent[INDEX_BOTTOM])));
|
|
maxHeight = Math.max(maxHeight, ascent + descent);
|
|
}
|
|
|
|
if (useLargestChild && widthMode == MeasureSpec.AT_MOST) {
|
|
mTotalLength = 0;
|
|
|
|
for (int i = 0; i < count; ++i) {
|
|
final View child = getVirtualChildAt(i);
|
|
|
|
if (child == null) {
|
|
mTotalLength += measureNullChild(i);
|
|
continue;
|
|
}
|
|
|
|
if (child.getVisibility() == GONE) {
|
|
i += getChildrenSkipCount(child, i);
|
|
continue;
|
|
}
|
|
|
|
final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)
|
|
child.getLayoutParams();
|
|
if (isExactly) {
|
|
mTotalLength += largestChildWidth + lp.leftMargin + lp.rightMargin +
|
|
getNextLocationOffset(child);
|
|
} else {
|
|
final int totalLength = mTotalLength;
|
|
mTotalLength = Math.max(totalLength, totalLength + largestChildWidth +
|
|
lp.leftMargin + lp.rightMargin + getNextLocationOffset(child));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add in our padding
|
|
mTotalLength += mPaddingLeft + mPaddingRight;
|
|
|
|
int widthSize = mTotalLength;
|
|
|
|
// Check against our minimum width
|
|
widthSize = Math.max(widthSize, getSuggestedMinimumWidth());
|
|
|
|
// Reconcile our calculated size with the widthMeasureSpec
|
|
widthSize = resolveSize(widthSize, widthMeasureSpec);
|
|
|
|
// Either expand children with weight to take up available space or
|
|
// shrink them if they extend beyond our current bounds
|
|
int delta = widthSize - mTotalLength;
|
|
if (delta != 0 && totalWeight > 0.0f) {
|
|
float weightSum = mWeightSum > 0.0f ? mWeightSum : totalWeight;
|
|
|
|
maxAscent[0] = maxAscent[1] = maxAscent[2] = maxAscent[3] = -1;
|
|
maxDescent[0] = maxDescent[1] = maxDescent[2] = maxDescent[3] = -1;
|
|
maxHeight = -1;
|
|
|
|
mTotalLength = 0;
|
|
|
|
for (int i = 0; i < count; ++i) {
|
|
final View child = getVirtualChildAt(i);
|
|
|
|
if (child == null || child.getVisibility() == View.GONE) {
|
|
continue;
|
|
}
|
|
|
|
final LinearLayout.LayoutParams lp =
|
|
(LinearLayout.LayoutParams) child.getLayoutParams();
|
|
|
|
float childExtra = lp.weight;
|
|
if (childExtra > 0) {
|
|
// Child said it could absorb extra space -- give him his share
|
|
int share = (int) (childExtra * delta / weightSum);
|
|
weightSum -= childExtra;
|
|
delta -= share;
|
|
|
|
final int childHeightMeasureSpec = getChildMeasureSpec(
|
|
heightMeasureSpec,
|
|
mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin,
|
|
lp.height);
|
|
|
|
// TODO: Use a field like lp.isMeasured to figure out if this
|
|
// child has been previously measured
|
|
if ((lp.width != 0) || (widthMode != MeasureSpec.EXACTLY)) {
|
|
// child was measured once already above ... base new measurement
|
|
// on stored values
|
|
int childWidth = child.getMeasuredWidth() + share;
|
|
if (childWidth < 0) {
|
|
childWidth = 0;
|
|
}
|
|
|
|
child.measure(
|
|
MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY),
|
|
childHeightMeasureSpec);
|
|
} else {
|
|
// child was skipped in the loop above. Measure for this first time here
|
|
child.measure(MeasureSpec.makeMeasureSpec(
|
|
share > 0 ? share : 0, MeasureSpec.EXACTLY),
|
|
childHeightMeasureSpec);
|
|
}
|
|
}
|
|
|
|
if (isExactly) {
|
|
mTotalLength += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin +
|
|
getNextLocationOffset(child);
|
|
} else {
|
|
final int totalLength = mTotalLength;
|
|
mTotalLength = Math.max(totalLength, totalLength + child.getMeasuredWidth() +
|
|
lp.leftMargin + lp.rightMargin + getNextLocationOffset(child));
|
|
}
|
|
|
|
boolean matchHeightLocally = heightMode != MeasureSpec.EXACTLY &&
|
|
lp.height == LayoutParams.MATCH_PARENT;
|
|
|
|
final int margin = lp.topMargin + lp .bottomMargin;
|
|
int childHeight = child.getMeasuredHeight() + margin;
|
|
maxHeight = Math.max(maxHeight, childHeight);
|
|
alternativeMaxHeight = Math.max(alternativeMaxHeight,
|
|
matchHeightLocally ? margin : childHeight);
|
|
|
|
allFillParent = allFillParent && lp.height == LayoutParams.MATCH_PARENT;
|
|
|
|
if (baselineAligned) {
|
|
final int childBaseline = child.getBaseline();
|
|
if (childBaseline != -1) {
|
|
// Translates the child's vertical gravity into an index in the range 0..2
|
|
final int gravity = (lp.gravity < 0 ? mGravity : lp.gravity)
|
|
& Gravity.VERTICAL_GRAVITY_MASK;
|
|
final int index = ((gravity >> Gravity.AXIS_Y_SHIFT)
|
|
& ~Gravity.AXIS_SPECIFIED) >> 1;
|
|
|
|
maxAscent[index] = Math.max(maxAscent[index], childBaseline);
|
|
maxDescent[index] = Math.max(maxDescent[index],
|
|
childHeight - childBaseline);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add in our padding
|
|
mTotalLength += mPaddingLeft + mPaddingRight;
|
|
// TODO: Should we update widthSize with the new total length?
|
|
|
|
// Check mMaxAscent[INDEX_TOP] first because it maps to Gravity.TOP,
|
|
// the most common case
|
|
if (maxAscent[INDEX_TOP] != -1 ||
|
|
maxAscent[INDEX_CENTER_VERTICAL] != -1 ||
|
|
maxAscent[INDEX_BOTTOM] != -1 ||
|
|
maxAscent[INDEX_FILL] != -1) {
|
|
final int ascent = Math.max(maxAscent[INDEX_FILL],
|
|
Math.max(maxAscent[INDEX_CENTER_VERTICAL],
|
|
Math.max(maxAscent[INDEX_TOP], maxAscent[INDEX_BOTTOM])));
|
|
final int descent = Math.max(maxDescent[INDEX_FILL],
|
|
Math.max(maxDescent[INDEX_CENTER_VERTICAL],
|
|
Math.max(maxDescent[INDEX_TOP], maxDescent[INDEX_BOTTOM])));
|
|
maxHeight = Math.max(maxHeight, ascent + descent);
|
|
}
|
|
} else {
|
|
alternativeMaxHeight = Math.max(alternativeMaxHeight, weightedMaxHeight);
|
|
}
|
|
|
|
if (!allFillParent && heightMode != MeasureSpec.EXACTLY) {
|
|
maxHeight = alternativeMaxHeight;
|
|
}
|
|
|
|
maxHeight += mPaddingTop + mPaddingBottom;
|
|
|
|
// Check against our minimum height
|
|
maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
|
|
|
|
setMeasuredDimension(widthSize, resolveSize(maxHeight, heightMeasureSpec));
|
|
|
|
if (matchHeight) {
|
|
forceUniformHeight(count, widthMeasureSpec);
|
|
}
|
|
}
|
|
|
|
private void forceUniformHeight(int count, int widthMeasureSpec) {
|
|
// Pretend that the linear layout has an exact size. This is the measured height of
|
|
// ourselves. The measured height should be the max height of the children, changed
|
|
// to accomodate the heightMesureSpec from the parent
|
|
int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(),
|
|
MeasureSpec.EXACTLY);
|
|
for (int i = 0; i < count; ++i) {
|
|
final View child = getVirtualChildAt(i);
|
|
if (child.getVisibility() != GONE) {
|
|
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child.getLayoutParams();
|
|
|
|
if (lp.height == LayoutParams.MATCH_PARENT) {
|
|
// Temporarily force children to reuse their old measured width
|
|
// FIXME: this may not be right for something like wrapping text?
|
|
int oldWidth = lp.width;
|
|
lp.width = child.getMeasuredWidth();
|
|
|
|
// Remeasure with new dimensions
|
|
measureChildWithMargins(child, widthMeasureSpec, 0, uniformMeasureSpec, 0);
|
|
lp.width = oldWidth;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* <p>Returns the number of children to skip after measuring/laying out
|
|
* the specified child.</p>
|
|
*
|
|
* @param child the child after which we want to skip children
|
|
* @param index the index of the child after which we want to skip children
|
|
* @return the number of children to skip, 0 by default
|
|
*/
|
|
int getChildrenSkipCount(View child, int index) {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* <p>Returns the size (width or height) that should be occupied by a null
|
|
* child.</p>
|
|
*
|
|
* @param childIndex the index of the null child
|
|
* @return the width or height of the child depending on the orientation
|
|
*/
|
|
int measureNullChild(int childIndex) {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* <p>Measure the child according to the parent's measure specs. This
|
|
* method should be overriden by subclasses to force the sizing of
|
|
* children. This method is called by {@link #measureVertical(int, int)} and
|
|
* {@link #measureHorizontal(int, int)}.</p>
|
|
*
|
|
* @param child the child to measure
|
|
* @param childIndex the index of the child in this view
|
|
* @param widthMeasureSpec horizontal space requirements as imposed by the parent
|
|
* @param totalWidth extra space that has been used up by the parent horizontally
|
|
* @param heightMeasureSpec vertical space requirements as imposed by the parent
|
|
* @param totalHeight extra space that has been used up by the parent vertically
|
|
*/
|
|
void measureChildBeforeLayout(View child, int childIndex,
|
|
int widthMeasureSpec, int totalWidth, int heightMeasureSpec,
|
|
int totalHeight) {
|
|
measureChildWithMargins(child, widthMeasureSpec, totalWidth,
|
|
heightMeasureSpec, totalHeight);
|
|
}
|
|
|
|
/**
|
|
* <p>Return the location offset of the specified child. This can be used
|
|
* by subclasses to change the location of a given widget.</p>
|
|
*
|
|
* @param child the child for which to obtain the location offset
|
|
* @return the location offset in pixels
|
|
*/
|
|
int getLocationOffset(View child) {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* <p>Return the size offset of the next sibling of the specified child.
|
|
* This can be used by subclasses to change the location of the widget
|
|
* following <code>child</code>.</p>
|
|
*
|
|
* @param child the child whose next sibling will be moved
|
|
* @return the location offset of the next child in pixels
|
|
*/
|
|
int getNextLocationOffset(View child) {
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
protected void onLayout(boolean changed, int l, int t, int r, int b) {
|
|
if (mOrientation == VERTICAL) {
|
|
layoutVertical();
|
|
} else {
|
|
layoutHorizontal();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Position the children during a layout pass if the orientation of this
|
|
* LinearLayout is set to {@link #VERTICAL}.
|
|
*
|
|
* @see #getOrientation()
|
|
* @see #setOrientation(int)
|
|
* @see #onLayout(boolean, int, int, int, int)
|
|
*/
|
|
void layoutVertical() {
|
|
final int paddingLeft = mPaddingLeft;
|
|
|
|
int childTop = mPaddingTop;
|
|
int childLeft;
|
|
|
|
// Where right end of child should go
|
|
final int width = mRight - mLeft;
|
|
int childRight = width - mPaddingRight;
|
|
|
|
// Space available for child
|
|
int childSpace = width - paddingLeft - mPaddingRight;
|
|
|
|
final int count = getVirtualChildCount();
|
|
|
|
final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
|
|
final int minorGravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
|
|
|
|
if (majorGravity != Gravity.TOP) {
|
|
switch (majorGravity) {
|
|
case Gravity.BOTTOM:
|
|
// mTotalLength contains the padding already, we add the top
|
|
// padding to compensate
|
|
childTop = mBottom - mTop + mPaddingTop - mTotalLength;
|
|
break;
|
|
|
|
case Gravity.CENTER_VERTICAL:
|
|
childTop += ((mBottom - mTop) - mTotalLength) / 2;
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = getVirtualChildAt(i);
|
|
if (child == null) {
|
|
childTop += measureNullChild(i);
|
|
} else if (child.getVisibility() != GONE) {
|
|
final int childWidth = child.getMeasuredWidth();
|
|
final int childHeight = child.getMeasuredHeight();
|
|
|
|
final LinearLayout.LayoutParams lp =
|
|
(LinearLayout.LayoutParams) child.getLayoutParams();
|
|
|
|
int gravity = lp.gravity;
|
|
if (gravity < 0) {
|
|
gravity = minorGravity;
|
|
}
|
|
|
|
switch (gravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
|
|
case Gravity.LEFT:
|
|
childLeft = paddingLeft + lp.leftMargin;
|
|
break;
|
|
|
|
case Gravity.CENTER_HORIZONTAL:
|
|
childLeft = paddingLeft + ((childSpace - childWidth) / 2)
|
|
+ lp.leftMargin - lp.rightMargin;
|
|
break;
|
|
|
|
case Gravity.RIGHT:
|
|
childLeft = childRight - childWidth - lp.rightMargin;
|
|
break;
|
|
default:
|
|
childLeft = paddingLeft;
|
|
break;
|
|
}
|
|
|
|
|
|
childTop += lp.topMargin;
|
|
setChildFrame(child, childLeft, childTop + getLocationOffset(child),
|
|
childWidth, childHeight);
|
|
childTop += childHeight + lp.bottomMargin + getNextLocationOffset(child);
|
|
|
|
i += getChildrenSkipCount(child, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Position the children during a layout pass if the orientation of this
|
|
* LinearLayout is set to {@link #HORIZONTAL}.
|
|
*
|
|
* @see #getOrientation()
|
|
* @see #setOrientation(int)
|
|
* @see #onLayout(boolean, int, int, int, int)
|
|
*/
|
|
void layoutHorizontal() {
|
|
final int paddingTop = mPaddingTop;
|
|
|
|
int childTop;
|
|
int childLeft = mPaddingLeft;
|
|
|
|
// Where bottom of child should go
|
|
final int height = mBottom - mTop;
|
|
int childBottom = height - mPaddingBottom;
|
|
|
|
// Space available for child
|
|
int childSpace = height - paddingTop - mPaddingBottom;
|
|
|
|
final int count = getVirtualChildCount();
|
|
|
|
final int majorGravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
|
|
final int minorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
|
|
|
|
final boolean baselineAligned = mBaselineAligned;
|
|
|
|
final int[] maxAscent = mMaxAscent;
|
|
final int[] maxDescent = mMaxDescent;
|
|
|
|
if (majorGravity != Gravity.LEFT) {
|
|
switch (majorGravity) {
|
|
case Gravity.RIGHT:
|
|
// mTotalLength contains the padding already, we add the left
|
|
// padding to compensate
|
|
childLeft = mRight - mLeft + mPaddingLeft - mTotalLength;
|
|
break;
|
|
|
|
case Gravity.CENTER_HORIZONTAL:
|
|
childLeft += ((mRight - mLeft) - mTotalLength) / 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = getVirtualChildAt(i);
|
|
|
|
if (child == null) {
|
|
childLeft += measureNullChild(i);
|
|
} else if (child.getVisibility() != GONE) {
|
|
final int childWidth = child.getMeasuredWidth();
|
|
final int childHeight = child.getMeasuredHeight();
|
|
int childBaseline = -1;
|
|
|
|
final LinearLayout.LayoutParams lp =
|
|
(LinearLayout.LayoutParams) child.getLayoutParams();
|
|
|
|
if (baselineAligned && lp.height != LayoutParams.MATCH_PARENT) {
|
|
childBaseline = child.getBaseline();
|
|
}
|
|
|
|
int gravity = lp.gravity;
|
|
if (gravity < 0) {
|
|
gravity = minorGravity;
|
|
}
|
|
|
|
switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) {
|
|
case Gravity.TOP:
|
|
childTop = paddingTop + lp.topMargin;
|
|
if (childBaseline != -1) {
|
|
childTop += maxAscent[INDEX_TOP] - childBaseline;
|
|
}
|
|
break;
|
|
|
|
case Gravity.CENTER_VERTICAL:
|
|
// Removed support for baseline alignment when layout_gravity or
|
|
// gravity == center_vertical. See bug #1038483.
|
|
// Keep the code around if we need to re-enable this feature
|
|
// if (childBaseline != -1) {
|
|
// // Align baselines vertically only if the child is smaller than us
|
|
// if (childSpace - childHeight > 0) {
|
|
// childTop = paddingTop + (childSpace / 2) - childBaseline;
|
|
// } else {
|
|
// childTop = paddingTop + (childSpace - childHeight) / 2;
|
|
// }
|
|
// } else {
|
|
childTop = paddingTop + ((childSpace - childHeight) / 2)
|
|
+ lp.topMargin - lp.bottomMargin;
|
|
break;
|
|
|
|
case Gravity.BOTTOM:
|
|
childTop = childBottom - childHeight - lp.bottomMargin;
|
|
if (childBaseline != -1) {
|
|
int descent = child.getMeasuredHeight() - childBaseline;
|
|
childTop -= (maxDescent[INDEX_BOTTOM] - descent);
|
|
}
|
|
break;
|
|
default:
|
|
childTop = paddingTop;
|
|
break;
|
|
}
|
|
|
|
childLeft += lp.leftMargin;
|
|
setChildFrame(child, childLeft + getLocationOffset(child), childTop,
|
|
childWidth, childHeight);
|
|
childLeft += childWidth + lp.rightMargin +
|
|
getNextLocationOffset(child);
|
|
|
|
i += getChildrenSkipCount(child, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void setChildFrame(View child, int left, int top, int width, int height) {
|
|
child.layout(left, top, left + width, top + height);
|
|
}
|
|
|
|
/**
|
|
* Should the layout be a column or a row.
|
|
* @param orientation Pass HORIZONTAL or VERTICAL. Default
|
|
* value is HORIZONTAL.
|
|
*
|
|
* @attr ref android.R.styleable#LinearLayout_orientation
|
|
*/
|
|
public void setOrientation(int orientation) {
|
|
if (mOrientation != orientation) {
|
|
mOrientation = orientation;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the current orientation.
|
|
*
|
|
* @return either {@link #HORIZONTAL} or {@link #VERTICAL}
|
|
*/
|
|
public int getOrientation() {
|
|
return mOrientation;
|
|
}
|
|
|
|
/**
|
|
* Describes how the child views are positioned. Defaults to GRAVITY_TOP. If
|
|
* this layout has a VERTICAL orientation, this controls where all the child
|
|
* views are placed if there is extra vertical space. If this layout has a
|
|
* HORIZONTAL orientation, this controls the alignment of the children.
|
|
*
|
|
* @param gravity See {@link android.view.Gravity}
|
|
*
|
|
* @attr ref android.R.styleable#LinearLayout_gravity
|
|
*/
|
|
@android.view.RemotableViewMethod
|
|
public void setGravity(int gravity) {
|
|
if (mGravity != gravity) {
|
|
if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == 0) {
|
|
gravity |= Gravity.LEFT;
|
|
}
|
|
|
|
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
|
|
gravity |= Gravity.TOP;
|
|
}
|
|
|
|
mGravity = gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@android.view.RemotableViewMethod
|
|
public void setHorizontalGravity(int horizontalGravity) {
|
|
final int gravity = horizontalGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
|
|
if ((mGravity & Gravity.HORIZONTAL_GRAVITY_MASK) != gravity) {
|
|
mGravity = (mGravity & ~Gravity.HORIZONTAL_GRAVITY_MASK) | gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@android.view.RemotableViewMethod
|
|
public void setVerticalGravity(int verticalGravity) {
|
|
final int gravity = verticalGravity & Gravity.VERTICAL_GRAVITY_MASK;
|
|
if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != gravity) {
|
|
mGravity = (mGravity & ~Gravity.VERTICAL_GRAVITY_MASK) | gravity;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public LayoutParams generateLayoutParams(AttributeSet attrs) {
|
|
return new LinearLayout.LayoutParams(getContext(), attrs);
|
|
}
|
|
|
|
/**
|
|
* Returns a set of layout parameters with a width of
|
|
* {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT}
|
|
* and a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}
|
|
* when the layout's orientation is {@link #VERTICAL}. When the orientation is
|
|
* {@link #HORIZONTAL}, the width is set to {@link LayoutParams#WRAP_CONTENT}
|
|
* and the height to {@link LayoutParams#WRAP_CONTENT}.
|
|
*/
|
|
@Override
|
|
protected LayoutParams generateDefaultLayoutParams() {
|
|
if (mOrientation == HORIZONTAL) {
|
|
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
|
|
} else if (mOrientation == VERTICAL) {
|
|
return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
|
|
return new LayoutParams(p);
|
|
}
|
|
|
|
|
|
// Override to allow type-checking of LayoutParams.
|
|
@Override
|
|
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
|
|
return p instanceof LinearLayout.LayoutParams;
|
|
}
|
|
|
|
/**
|
|
* Per-child layout information associated with ViewLinearLayout.
|
|
*
|
|
* @attr ref android.R.styleable#LinearLayout_Layout_layout_weight
|
|
* @attr ref android.R.styleable#LinearLayout_Layout_layout_gravity
|
|
*/
|
|
public static class LayoutParams extends ViewGroup.MarginLayoutParams {
|
|
/**
|
|
* Indicates how much of the extra space in the LinearLayout will be
|
|
* allocated to the view associated with these LayoutParams. Specify
|
|
* 0 if the view should not be stretched. Otherwise the extra pixels
|
|
* will be pro-rated among all views whose weight is greater than 0.
|
|
*/
|
|
@ViewDebug.ExportedProperty(category = "layout")
|
|
public float weight;
|
|
|
|
/**
|
|
* Gravity for the view associated with these LayoutParams.
|
|
*
|
|
* @see android.view.Gravity
|
|
*/
|
|
@ViewDebug.ExportedProperty(category = "layout", mapping = {
|
|
@ViewDebug.IntToString(from = -1, to = "NONE"),
|
|
@ViewDebug.IntToString(from = Gravity.NO_GRAVITY, to = "NONE"),
|
|
@ViewDebug.IntToString(from = Gravity.TOP, to = "TOP"),
|
|
@ViewDebug.IntToString(from = Gravity.BOTTOM, to = "BOTTOM"),
|
|
@ViewDebug.IntToString(from = Gravity.LEFT, to = "LEFT"),
|
|
@ViewDebug.IntToString(from = Gravity.RIGHT, to = "RIGHT"),
|
|
@ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL, to = "CENTER_VERTICAL"),
|
|
@ViewDebug.IntToString(from = Gravity.FILL_VERTICAL, to = "FILL_VERTICAL"),
|
|
@ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"),
|
|
@ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL, to = "FILL_HORIZONTAL"),
|
|
@ViewDebug.IntToString(from = Gravity.CENTER, to = "CENTER"),
|
|
@ViewDebug.IntToString(from = Gravity.FILL, to = "FILL")
|
|
})
|
|
public int gravity = -1;
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(Context c, AttributeSet attrs) {
|
|
super(c, attrs);
|
|
TypedArray a =
|
|
c.obtainStyledAttributes(attrs, com.android.internal.R.styleable.LinearLayout_Layout);
|
|
|
|
weight = a.getFloat(com.android.internal.R.styleable.LinearLayout_Layout_layout_weight, 0);
|
|
gravity = a.getInt(com.android.internal.R.styleable.LinearLayout_Layout_layout_gravity, -1);
|
|
|
|
a.recycle();
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(int width, int height) {
|
|
super(width, height);
|
|
weight = 0;
|
|
}
|
|
|
|
/**
|
|
* Creates a new set of layout parameters with the specified width, height
|
|
* and weight.
|
|
*
|
|
* @param width the width, either {@link #MATCH_PARENT},
|
|
* {@link #WRAP_CONTENT} or a fixed size in pixels
|
|
* @param height the height, either {@link #MATCH_PARENT},
|
|
* {@link #WRAP_CONTENT} or a fixed size in pixels
|
|
* @param weight the weight
|
|
*/
|
|
public LayoutParams(int width, int height, float weight) {
|
|
super(width, height);
|
|
this.weight = weight;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(ViewGroup.LayoutParams p) {
|
|
super(p);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(MarginLayoutParams source) {
|
|
super(source);
|
|
}
|
|
|
|
@Override
|
|
public String debug(String output) {
|
|
return output + "LinearLayout.LayoutParams={width=" + sizeToString(width) +
|
|
", height=" + sizeToString(height) + " weight=" + weight + "}";
|
|
}
|
|
}
|
|
}
|