Modifying wallpapers customization page to look like widgets.

- Disallowing touch handling when there are no children

Change-Id: I925d6f1f862f8c7994a80c4eaacc80f8d59f6ab2

src/com/android/launcher2/PagedViewExtendedLayout.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2010 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.launcher2;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.widget.LinearLayout;
+
+/**
+ * The linear layout used strictly for the widget/wallpaper tab of the customization tray
+ */
+public class PagedViewExtendedLayout extends LinearLayout {
+    static final String TAG = "PagedViewWidgetLayout";
+
+    public PagedViewExtendedLayout(Context context) {
+        this(context, null);
+    }
+
+    public PagedViewExtendedLayout(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public PagedViewExtendedLayout(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        // We eat up the touch events here, since the PagedView (which uses the same swiping
+        // touch code as Workspace previously) uses onInterceptTouchEvent() to determine when
+        // the user is scrolling between pages.  This means that if the pages themselves don't
+        // handle touch events, it gets forwarded up to PagedView itself, and it's own
+        // onTouchEvent() handling will prevent further intercept touch events from being called
+        // (it's the same view in that case).  This is not ideal, but to prevent more changes,
+        // we just always mark the touch event as handled.
+        return super.onTouchEvent(event) || true;
+    }
+
+    @Override
+    protected boolean onSetAlpha(int alpha) {
+        return true;
+    }
+
+    @Override
+    public void setAlpha(float alpha) {
+        setChildrenAlpha(alpha);
+        super.setAlpha(alpha);
+    }
+
+    private void setChildrenAlpha(float alpha) {
+        final int childCount = getChildCount();
+        for (int i = 0; i < childCount; i++) {
+            getChildAt(i).setAlpha(alpha);
+        }
+    }
+}