Unifying focus indicator handling for workspace and all-apps

Adding an abstract FocusIndicatorHelper based on FocusIndicatorView
which draws the background instead of using a dummy view.

Change-Id: Id560195323d2ddad8fcd77ba675cf3f4fd4a94ab

1 files changed, 85 insertions, 0 deletions

diff --git a/src/com/android/launcher3/keyboard/ViewGroupFocusHelper.java b/src/com/android/launcher3/keyboard/ViewGroupFocusHelper.java
new file mode 100644
index 000000000..bd5c06e5b
--- /dev/null
+++ b/src/com/android/launcher3/keyboard/ViewGroupFocusHelper.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2016 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.keyboard;
+
+import android.graphics.Rect;
+import android.view.View;
+import android.view.View.OnFocusChangeListener;
+
+import com.android.launcher3.PagedView;
+
+/**
+ * {@link FocusIndicatorHelper} for a generic view group.
+ */
+public class ViewGroupFocusHelper extends FocusIndicatorHelper {
+
+    private final View mContainer;
+
+    public ViewGroupFocusHelper(View container) {
+        super(container);
+        mContainer = container;
+    }
+
+    @Override
+    public void viewToRect(View v, Rect outRect) {
+        outRect.left = 0;
+        outRect.top = 0;
+
+        computeLocationRelativeToContainer(v, outRect);
+
+        // If a view is scaled, its position will also shift accordingly. For optimization, only
+        // consider this for the last node.
+        outRect.left += (1 - v.getScaleX()) * v.getWidth() / 2;
+        outRect.top += (1 - v.getScaleY()) * v.getHeight() / 2;
+
+        outRect.right = outRect.left + (int) (v.getScaleX() * v.getWidth());
+        outRect.bottom = outRect.top + (int) (v.getScaleY() * v.getHeight());
+    }
+
+    private void computeLocationRelativeToContainer(View child, Rect outRect) {
+        View parent = (View) child.getParent();
+        outRect.left += child.getLeft();
+        outRect.top += child.getTop();
+
+        if (parent != mContainer) {
+            if (parent instanceof PagedView) {
+                PagedView page = (PagedView) parent;
+                outRect.left -= page.getScrollForPage(page.indexOfChild(child));
+            }
+
+            computeLocationRelativeToContainer(parent, outRect);
+        }
+    }
+
+    /**
+     * Sets the alpha of this FocusIndicatorHelper to 0 when a view with this listener
+     * receives focus.
+     */
+    public View.OnFocusChangeListener getHideIndicatorOnFocusListener() {
+        return new OnFocusChangeListener() {
+            @Override
+            public void onFocusChange(View v, boolean hasFocus) {
+                if (hasFocus) {
+                    endCurrentAnimation();
+                    setCurrentView(null);
+                    setAlpha(0);
+                    invalidateDirty();
+                }
+            }
+        };
+    }
+}