M7350/base/core/java/android/widget/ToggleButton.java

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2024-09-09 08:52:07 +00:00
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.util.AttributeSet;
/**
* Displays checked/unchecked states as a button
* with a "light" indicator and by default accompanied with the text "ON" or "OFF".
*
* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-formstuff.html">Form Stuff
* tutorial</a>.</p>
*
* @attr ref android.R.styleable#ToggleButton_textOn
* @attr ref android.R.styleable#ToggleButton_textOff
* @attr ref android.R.styleable#ToggleButton_disabledAlpha
*/
public class ToggleButton extends CompoundButton {
private CharSequence mTextOn;
private CharSequence mTextOff;
private Drawable mIndicatorDrawable;
private static final int NO_ALPHA = 0xFF;
private float mDisabledAlpha;
public ToggleButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a =
context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.ToggleButton, defStyle, 0);
mTextOn = a.getText(com.android.internal.R.styleable.ToggleButton_textOn);
mTextOff = a.getText(com.android.internal.R.styleable.ToggleButton_textOff);
mDisabledAlpha = a.getFloat(com.android.internal.R.styleable.ToggleButton_disabledAlpha, 0.5f);
syncTextState();
a.recycle();
}
public ToggleButton(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.buttonStyleToggle);
}
public ToggleButton(Context context) {
this(context, null);
}
@Override
public void setChecked(boolean checked) {
super.setChecked(checked);
syncTextState();
}
private void syncTextState() {
boolean checked = isChecked();
if (checked && mTextOn != null) {
setText(mTextOn);
} else if (!checked && mTextOff != null) {
setText(mTextOff);
}
}
/**
* Returns the text for when the button is in the checked state.
*
* @return The text.
*/
public CharSequence getTextOn() {
return mTextOn;
}
/**
* Sets the text for when the button is in the checked state.
*
* @param textOn The text.
*/
public void setTextOn(CharSequence textOn) {
mTextOn = textOn;
}
/**
* Returns the text for when the button is not in the checked state.
*
* @return The text.
*/
public CharSequence getTextOff() {
return mTextOff;
}
/**
* Sets the text for when the button is not in the checked state.
*
* @param textOff The text.
*/
public void setTextOff(CharSequence textOff) {
mTextOff = textOff;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
updateReferenceToIndicatorDrawable(getBackground());
}
@Override
public void setBackgroundDrawable(Drawable d) {
super.setBackgroundDrawable(d);
updateReferenceToIndicatorDrawable(d);
}
private void updateReferenceToIndicatorDrawable(Drawable backgroundDrawable) {
if (backgroundDrawable instanceof LayerDrawable) {
LayerDrawable layerDrawable = (LayerDrawable) backgroundDrawable;
mIndicatorDrawable =
layerDrawable.findDrawableByLayerId(com.android.internal.R.id.toggle);
}
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mIndicatorDrawable != null) {
mIndicatorDrawable.setAlpha(isEnabled() ? NO_ALPHA : (int) (NO_ALPHA * mDisabledAlpha));
}
}
}