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Diffstat (limited to 'java/com/android/bubble/CheckableImageButton.java')
-rw-r--r-- | java/com/android/bubble/CheckableImageButton.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/java/com/android/bubble/CheckableImageButton.java b/java/com/android/bubble/CheckableImageButton.java new file mode 100644 index 000000000..dd9acced8 --- /dev/null +++ b/java/com/android/bubble/CheckableImageButton.java @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2017 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 com.android.bubble; + +import android.content.Context; +import android.support.v4.view.AccessibilityDelegateCompat; +import android.support.v4.view.ViewCompat; +import android.support.v4.view.accessibility.AccessibilityEventCompat; +import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; +import android.support.v7.widget.AppCompatImageButton; +import android.util.AttributeSet; +import android.view.View; +import android.view.accessibility.AccessibilityEvent; +import android.widget.Checkable; + +/** + * An {@link android.widget.ImageButton ImageButton} that implements {@link Checkable} and + * propagates the checkable state + */ +public class CheckableImageButton extends AppCompatImageButton implements Checkable { + + // Copied without modification from AppCompat library + + private static final int[] DRAWABLE_STATE_CHECKED = new int[] {android.R.attr.state_checked}; + + private boolean mChecked; + + public CheckableImageButton(Context context) { + this(context, null); + } + + public CheckableImageButton(Context context, AttributeSet attrs) { + this(context, attrs, android.R.attr.imageButtonStyle); + } + + public CheckableImageButton(Context context, AttributeSet attrs, int defStyleAttr) { + super(context, attrs, defStyleAttr); + + ViewCompat.setAccessibilityDelegate( + this, + new AccessibilityDelegateCompat() { + @Override + public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { + super.onInitializeAccessibilityEvent(host, event); + event.setChecked(isChecked()); + } + + @Override + public void onInitializeAccessibilityNodeInfo( + View host, AccessibilityNodeInfoCompat info) { + super.onInitializeAccessibilityNodeInfo(host, info); + info.setCheckable(true); + info.setChecked(isChecked()); + } + }); + } + + @Override + public void setChecked(boolean checked) { + if (mChecked != checked) { + mChecked = checked; + refreshDrawableState(); + sendAccessibilityEvent(AccessibilityEventCompat.TYPE_WINDOW_CONTENT_CHANGED); + } + } + + @Override + public boolean isChecked() { + return mChecked; + } + + @Override + public void toggle() { + setChecked(!mChecked); + } + + @Override + public int[] onCreateDrawableState(int extraSpace) { + if (mChecked) { + return mergeDrawableStates( + super.onCreateDrawableState(extraSpace + DRAWABLE_STATE_CHECKED.length), + DRAWABLE_STATE_CHECKED); + } else { + return super.onCreateDrawableState(extraSpace); + } + } +} |