1 files changed, 118 insertions, 0 deletions
diff --git a/src/com/android/launcher3/ClearCircleLayout.java b/src/com/android/launcher3/ClearCircleLayout.java
new file mode 100644
index 000000000..e48c84eef
--- /dev/null
+++ b/src/com/android/launcher3/ClearCircleLayout.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2014 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.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Point;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.view.View;
+
+public class ClearCircleLayout extends View {
+
+    private static final String HOLE_LOCATION_PAGE_INDICATOR = "page_indicator";
+    private static final String HOLE_LOCATION_CENTER_SCREEN = "center_screen";
+
+    private static final int BACKGROUND_COLOR = 0x80000000;
+    private static float MIGRATION_WORKSPACE_INNER_CIRCLE_RADIUS_DPS = 42;
+    private static float MIGRATION_WORKSPACE_OUTER_CIRCLE_RADIUS_DPS = 46;
+
+    private final String mHoleLocation;
+    private final Paint mErasePaint;
+    private final Paint mBorderPaint;
+
+    private Launcher mLauncher;
+    private Point mHoleCenter;
+    private DisplayMetrics mMetrics;
+
+    public ClearCircleLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ClearCircleLayout);
+        mHoleLocation = a.getString(R.styleable.ClearCircleLayout_holeLocation);
+        a.recycle();
+
+        mErasePaint = new Paint();
+        mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
+        mErasePaint.setColor(0xFFFFFF);
+        mErasePaint.setAlpha(0);
+        mErasePaint.setAntiAlias(true);
+
+        mBorderPaint = new Paint();
+        mBorderPaint.setColor(0xFFFFFFFF);
+        mBorderPaint.setAntiAlias(true);
+    }
+
+    void initHole(Launcher launcher) {
+        mLauncher = launcher;
+        mMetrics = new DisplayMetrics();
+        launcher.getWindowManager().getDefaultDisplay().getMetrics(mMetrics);
+
+        if (mHoleLocation.endsWith(HOLE_LOCATION_PAGE_INDICATOR)) {
+            LauncherAppState app = LauncherAppState.getInstance();
+            DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
+
+            Rect indicator = grid.getWorkspacePageIndicatorBounds(new Rect());
+            mHoleCenter = new Point(indicator.centerX(), indicator.centerY());
+        } else if (mHoleLocation.endsWith(HOLE_LOCATION_CENTER_SCREEN)) {
+            mHoleCenter = new Point(mMetrics.widthPixels / 2, mMetrics.heightPixels / 2);
+        }
+    }
+
+    @Override
+    protected void dispatchDraw(Canvas canvas) {
+        if (mHoleCenter == null) {
+            canvas.drawColor(BACKGROUND_COLOR);
+        } else {
+            drawHole(canvas);
+        }
+
+        super.dispatchDraw(canvas);
+    }
+
+    private void drawHole(Canvas canvas) {
+        // Initialize the draw buffer (to allow punching through)
+        Bitmap eraseBg = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),
+                Bitmap.Config.ARGB_8888);
+        Canvas eraseCanvas = new Canvas(eraseBg);
+        eraseCanvas.drawColor(BACKGROUND_COLOR);
+
+        Rect insets = mLauncher.getDragLayer().getInsets();
+        float x = mHoleCenter.x - insets.left;
+        float y = mHoleCenter.y - insets.top;
+        // Draw the outer circle
+        eraseCanvas.drawCircle(x, y,
+                DynamicGrid.pxFromDp(MIGRATION_WORKSPACE_OUTER_CIRCLE_RADIUS_DPS, mMetrics),
+                mBorderPaint);
+
+        // Draw the inner circle
+        eraseCanvas.drawCircle(x, y,
+                DynamicGrid.pxFromDp(MIGRATION_WORKSPACE_INNER_CIRCLE_RADIUS_DPS, mMetrics),
+                mErasePaint);
+
+        canvas.drawBitmap(eraseBg, 0, 0, null);
+        eraseCanvas.setBitmap(null);
+        eraseBg.recycle();
+    }
+}