Adding ability to delete previously saved wallpapers

- Also preserving temporarily picked wallpapers on
rotation

Change-Id: I35361e2a5619cd986bd8b66268ce9e94b9a0027e

src/com/android/launcher3/CheckableFrameLayout.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2013 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.launcher3;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.Checkable;
+import android.widget.FrameLayout;
+
+public class CheckableFrameLayout extends FrameLayout implements Checkable {
+    private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };
+    boolean mChecked;
+
+    public CheckableFrameLayout(Context context) {
+        super(context);
+    }
+
+    public CheckableFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public CheckableFrameLayout(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    public boolean isChecked() {
+        return mChecked;
+    }
+
+    public void setChecked(boolean checked) {
+        if (checked != mChecked) {
+            mChecked = checked;
+            refreshDrawableState();
+        }
+    }
+
+    public void toggle() {
+        setChecked(!mChecked);
+    }
+
+    @Override
+    protected int[] onCreateDrawableState(int extraSpace) {
+        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
+        if (isChecked()) {
+            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
+        }
+        return drawableState;
+    }
+}