1 files changed, 101 insertions, 0 deletions
diff --git a/java/com/android/dialershared/bubble/CheckableImageButton.java b/java/com/android/dialershared/bubble/CheckableImageButton.java
new file mode 100644
index 000000000..7a5a432a6
--- /dev/null
+++ b/java/com/android/dialershared/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.dialershared.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);
+    }
+  }
+}