151 lines
4.4 KiB
Java
151 lines
4.4 KiB
Java
/*
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* Copyright (C) 2007 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 android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.drawable.Drawable;
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import android.graphics.drawable.LayerDrawable;
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import android.util.AttributeSet;
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/**
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* Displays checked/unchecked states as a button
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* with a "light" indicator and by default accompanied with the text "ON" or "OFF".
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*
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* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-formstuff.html">Form Stuff
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* tutorial</a>.</p>
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*
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* @attr ref android.R.styleable#ToggleButton_textOn
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* @attr ref android.R.styleable#ToggleButton_textOff
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* @attr ref android.R.styleable#ToggleButton_disabledAlpha
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*/
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public class ToggleButton extends CompoundButton {
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private CharSequence mTextOn;
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private CharSequence mTextOff;
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private Drawable mIndicatorDrawable;
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private static final int NO_ALPHA = 0xFF;
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private float mDisabledAlpha;
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public ToggleButton(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a =
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context.obtainStyledAttributes(
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attrs, com.android.internal.R.styleable.ToggleButton, defStyle, 0);
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mTextOn = a.getText(com.android.internal.R.styleable.ToggleButton_textOn);
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mTextOff = a.getText(com.android.internal.R.styleable.ToggleButton_textOff);
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mDisabledAlpha = a.getFloat(com.android.internal.R.styleable.ToggleButton_disabledAlpha, 0.5f);
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syncTextState();
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a.recycle();
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}
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public ToggleButton(Context context, AttributeSet attrs) {
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this(context, attrs, com.android.internal.R.attr.buttonStyleToggle);
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}
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public ToggleButton(Context context) {
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this(context, null);
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}
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@Override
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public void setChecked(boolean checked) {
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super.setChecked(checked);
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syncTextState();
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}
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private void syncTextState() {
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boolean checked = isChecked();
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if (checked && mTextOn != null) {
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setText(mTextOn);
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} else if (!checked && mTextOff != null) {
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setText(mTextOff);
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}
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}
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/**
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* Returns the text for when the button is in the checked state.
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*
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* @return The text.
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*/
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public CharSequence getTextOn() {
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return mTextOn;
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}
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/**
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* Sets the text for when the button is in the checked state.
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*
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* @param textOn The text.
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*/
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public void setTextOn(CharSequence textOn) {
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mTextOn = textOn;
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}
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/**
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* Returns the text for when the button is not in the checked state.
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*
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* @return The text.
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*/
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public CharSequence getTextOff() {
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return mTextOff;
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}
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/**
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* Sets the text for when the button is not in the checked state.
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*
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* @param textOff The text.
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*/
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public void setTextOff(CharSequence textOff) {
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mTextOff = textOff;
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}
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@Override
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protected void onFinishInflate() {
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super.onFinishInflate();
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updateReferenceToIndicatorDrawable(getBackground());
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}
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@Override
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public void setBackgroundDrawable(Drawable d) {
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super.setBackgroundDrawable(d);
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updateReferenceToIndicatorDrawable(d);
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}
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private void updateReferenceToIndicatorDrawable(Drawable backgroundDrawable) {
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if (backgroundDrawable instanceof LayerDrawable) {
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LayerDrawable layerDrawable = (LayerDrawable) backgroundDrawable;
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mIndicatorDrawable =
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layerDrawable.findDrawableByLayerId(com.android.internal.R.id.toggle);
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}
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}
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@Override
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protected void drawableStateChanged() {
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super.drawableStateChanged();
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if (mIndicatorDrawable != null) {
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mIndicatorDrawable.setAlpha(isEnabled() ? NO_ALPHA : (int) (NO_ALPHA * mDisabledAlpha));
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}
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}
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}
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