Adding keyboard focus support for phones.

Change-Id: I2daab961d0727bc5d892db6b50ad0f51fe23873c

src/com/android/launcher2/PagedViewGridLayout.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2011 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.view.MotionEvent;
+import android.view.View;
+import android.view.View.MeasureSpec;
+import android.widget.FrameLayout;
+import android.widget.LinearLayout;
+
+/**
+ * The grid based layout used strictly for the widget/wallpaper tab of the AppsCustomize pane
+ */
+public class PagedViewGridLayout extends FrameLayout implements Page {
+    static final String TAG = "PagedViewGridLayout";
+
+    private int mCellCountX;
+    private int mCellCountY;
+
+    public PagedViewGridLayout(Context context, int cellCountX, int cellCountY) {
+        super(context, null, 0);
+        mCellCountX = cellCountX;
+        mCellCountY = cellCountY;
+    }
+
+    int getCellCountX() {
+        return mCellCountX;
+    }
+    int getCellCountY() {
+        return mCellCountY;
+    }
+
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // PagedView currently has issues with different-sized pages since it calculates the
+        // offset of each page to scroll to before it updates the actual size of each page
+        // (which can change depending on the content if the contents aren't a fixed size).
+        // We work around this by having a minimum size on each widget page).
+        int widthSpecSize = Math.max(getSuggestedMinimumWidth(),
+                MeasureSpec.getSize(widthMeasureSpec));
+        int widthSpecMode = MeasureSpec.AT_MOST;
+        super.onMeasure(MeasureSpec.makeMeasureSpec(widthSpecSize, widthSpecMode),
+                heightMeasureSpec);
+    }
+
+    @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);
+        }
+    }
+
+    @Override
+    public void removeAllViewsOnPage() {
+        removeAllViews();
+    }
+
+    @Override
+    public void removeViewOnPageAt(int index) {
+        removeViewAt(index);
+    }
+
+    @Override
+    public int getPageChildCount() {
+        return getChildCount();
+    }
+
+    @Override
+    public View getChildOnPageAt(int i) {
+        return getChildAt(i);
+    }
+
+    @Override
+    public int indexOfChildOnPage(View v) {
+        return indexOfChild(v);
+    }
+
+    public static class LayoutParams extends FrameLayout.LayoutParams {
+        public LayoutParams(int width, int height) {
+            super(width, height);
+        }
+    }
+}