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/** 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.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.RemoteViews.RemoteView;import java.util.Map;/*** <p>* Displays a button with an image (instead of text) that can be pressed * or clicked by the user. By default, an ImageButton looks like a regular * {@link android.widget.Button}, with the standard button background* that changes color during different button states. The image on the surface* of the button is defined either by the {@code android:src} attribute in the* {@code <ImageButton>} XML element or by the* {@link #setImageResource(int)} method.</p>* * <p>To remove the standard button background image, define your own * background image or set the background color to be transparent.</p>* <p>To indicate the different button states (focused, selected, etc.), you can* define a different image for each state. E.g., a blue image by default, an* orange one for when focused, and a yellow one for when pressed. An easy way to* do this is with an XML drawable "selector." For example:</p>* <pre>* <?xml version="1.0" encoding="utf-8"?>* <selector xmlns:android="http://schemas.android.com/apk/res/android">* <item android:state_pressed="true"* android:drawable="@drawable/button_pressed" /> <!-- pressed -->* <item android:state_focused="true"* android:drawable="@drawable/button_focused" /> <!-- focused -->* <item android:drawable="@drawable/button_normal" /> <!-- default -->* </selector></pre>** <p>Save the XML file in your project {@code res/drawable/} folder and then * reference it as a drawable for the source of your ImageButton (in the * {@code android:src} attribute). Android will automatically change the image * based on the state of the button and the corresponding images* defined in the XML.</p>** <p>The order of the {@code <item>} elements is important because they are* evaluated in order. This is why the "normal" button image comes last, because* it will only be applied after {@code android:state_pressed} and {@code* android:state_focused} have both evaluated false.</p>** <p>See the <a href="{@docRoot}guide/topics/ui/controls/button.html">Buttons</a>* guide.</p>** <p><strong>XML attributes</strong></p>* <p>* See {@link android.R.styleable#ImageView Button Attributes},* {@link android.R.styleable#View View Attributes}* </p>*/
@RemoteView
public class ImageButton extends ImageView {public ImageButton(Context context) {this(context, null);}public ImageButton(Context context, AttributeSet attrs) {this(context, attrs, com.android.internal.R.attr.imageButtonStyle);}public ImageButton(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);setFocusable(true);}@Overrideprotected boolean onSetAlpha(int alpha) {return false;}@Overridepublic void onInitializeAccessibilityEvent(AccessibilityEvent event) {super.onInitializeAccessibilityEvent(event);event.setClassName(ImageButton.class.getName());}@Overridepublic void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {super.onInitializeAccessibilityNodeInfo(info);info.setClassName(ImageButton.class.getName());}
}
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