1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.widget; 18 19 20 import android.content.Context; 21 import android.content.res.TypedArray; 22 import android.graphics.drawable.Drawable; 23 import android.graphics.drawable.LayerDrawable; 24 import android.util.AttributeSet; 25 import android.view.accessibility.AccessibilityEvent; 26 import android.view.accessibility.AccessibilityNodeInfo; 27 28 import com.android.internal.R; 29 30 /** 31 * Displays checked/unchecked states as a button 32 * with a "light" indicator and by default accompanied with the text "ON" or "OFF". 33 * 34 * <p>See the <a href="{@docRoot}guide/topics/ui/controls/togglebutton.html">Toggle Buttons</a> 35 * guide.</p> 36 * 37 * @attr ref android.R.styleable#ToggleButton_textOn 38 * @attr ref android.R.styleable#ToggleButton_textOff 39 * @attr ref android.R.styleable#ToggleButton_disabledAlpha 40 */ 41 public class ToggleButton extends CompoundButton { 42 private CharSequence mTextOn; 43 private CharSequence mTextOff; 44 45 private Drawable mIndicatorDrawable; 46 47 private static final int NO_ALPHA = 0xFF; 48 private float mDisabledAlpha; 49 ToggleButton(Context context, AttributeSet attrs, int defStyle)50 public ToggleButton(Context context, AttributeSet attrs, int defStyle) { 51 super(context, attrs, defStyle); 52 53 TypedArray a = 54 context.obtainStyledAttributes( 55 attrs, com.android.internal.R.styleable.ToggleButton, defStyle, 0); 56 mTextOn = a.getText(com.android.internal.R.styleable.ToggleButton_textOn); 57 mTextOff = a.getText(com.android.internal.R.styleable.ToggleButton_textOff); 58 mDisabledAlpha = a.getFloat(com.android.internal.R.styleable.ToggleButton_disabledAlpha, 0.5f); 59 syncTextState(); 60 a.recycle(); 61 } 62 ToggleButton(Context context, AttributeSet attrs)63 public ToggleButton(Context context, AttributeSet attrs) { 64 this(context, attrs, com.android.internal.R.attr.buttonStyleToggle); 65 } 66 ToggleButton(Context context)67 public ToggleButton(Context context) { 68 this(context, null); 69 } 70 71 @Override setChecked(boolean checked)72 public void setChecked(boolean checked) { 73 super.setChecked(checked); 74 75 syncTextState(); 76 } 77 syncTextState()78 private void syncTextState() { 79 boolean checked = isChecked(); 80 if (checked && mTextOn != null) { 81 setText(mTextOn); 82 } else if (!checked && mTextOff != null) { 83 setText(mTextOff); 84 } 85 } 86 87 /** 88 * Returns the text for when the button is in the checked state. 89 * 90 * @return The text. 91 */ getTextOn()92 public CharSequence getTextOn() { 93 return mTextOn; 94 } 95 96 /** 97 * Sets the text for when the button is in the checked state. 98 * 99 * @param textOn The text. 100 */ setTextOn(CharSequence textOn)101 public void setTextOn(CharSequence textOn) { 102 mTextOn = textOn; 103 } 104 105 /** 106 * Returns the text for when the button is not in the checked state. 107 * 108 * @return The text. 109 */ getTextOff()110 public CharSequence getTextOff() { 111 return mTextOff; 112 } 113 114 /** 115 * Sets the text for when the button is not in the checked state. 116 * 117 * @param textOff The text. 118 */ setTextOff(CharSequence textOff)119 public void setTextOff(CharSequence textOff) { 120 mTextOff = textOff; 121 } 122 123 @Override onFinishInflate()124 protected void onFinishInflate() { 125 super.onFinishInflate(); 126 127 updateReferenceToIndicatorDrawable(getBackground()); 128 } 129 130 @Override setBackgroundDrawable(Drawable d)131 public void setBackgroundDrawable(Drawable d) { 132 super.setBackgroundDrawable(d); 133 134 updateReferenceToIndicatorDrawable(d); 135 } 136 updateReferenceToIndicatorDrawable(Drawable backgroundDrawable)137 private void updateReferenceToIndicatorDrawable(Drawable backgroundDrawable) { 138 if (backgroundDrawable instanceof LayerDrawable) { 139 LayerDrawable layerDrawable = (LayerDrawable) backgroundDrawable; 140 mIndicatorDrawable = 141 layerDrawable.findDrawableByLayerId(com.android.internal.R.id.toggle); 142 } else { 143 mIndicatorDrawable = null; 144 } 145 } 146 147 @Override drawableStateChanged()148 protected void drawableStateChanged() { 149 super.drawableStateChanged(); 150 151 if (mIndicatorDrawable != null) { 152 mIndicatorDrawable.setAlpha(isEnabled() ? NO_ALPHA : (int) (NO_ALPHA * mDisabledAlpha)); 153 } 154 } 155 156 @Override onInitializeAccessibilityEvent(AccessibilityEvent event)157 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 158 super.onInitializeAccessibilityEvent(event); 159 event.setClassName(ToggleButton.class.getName()); 160 } 161 162 @Override onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info)163 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 164 super.onInitializeAccessibilityNodeInfo(info); 165 info.setClassName(ToggleButton.class.getName()); 166 } 167 } 168