1 files changed, 79 insertions, 0 deletions
diff --git a/src/com/android/launcher3/dragndrop/ExternalDragPreviewProvider.java b/src/com/android/launcher3/dragndrop/ExternalDragPreviewProvider.java
new file mode 100644
index 000000000..6b14be714
--- /dev/null
+++ b/src/com/android/launcher3/dragndrop/ExternalDragPreviewProvider.java
@@ -0,0 +1,79 @@
+/*
+ * 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.dragndrop;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.HolographicOutlineHelper;
+import com.android.launcher3.ItemInfo;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.graphics.DragPreviewProvider;
+
+/**
+ * Extension of {@link DragPreviewProvider} which provides a dummy outline when drag starts from
+ * a different window.
+ * It just draws an empty circle to a placeholder outline.
+ */
+public class ExternalDragPreviewProvider extends DragPreviewProvider {
+
+    private final Launcher mLauncher;
+    private final ItemInfo mAddInfo;
+
+    private final int[] mOutlineSize;
+
+    public ExternalDragPreviewProvider(Launcher launcher, ItemInfo addInfo) {
+        super(null);
+        mLauncher = launcher;
+        mAddInfo = addInfo;
+
+        mOutlineSize = mLauncher.getWorkspace().estimateItemSize(mAddInfo, false);
+    }
+
+    public Rect getPreviewBounds() {
+        Rect rect = new Rect();
+        DeviceProfile dp = mLauncher.getDeviceProfile();
+        rect.left = DRAG_BITMAP_PADDING / 2;
+        rect.top = (mOutlineSize[1] - dp.cellHeightPx) / 2;
+        rect.right = rect.left + dp.iconSizePx;
+        rect.bottom = rect.top + dp.iconSizePx;
+        return rect;
+    }
+
+    @Override
+    public Bitmap createDragOutline(Canvas canvas) {
+        final Bitmap b = Bitmap.createBitmap(mOutlineSize[0], mOutlineSize[1], Bitmap.Config.ALPHA_8);
+        canvas.setBitmap(b);
+
+        Paint paint = new Paint();
+        paint.setColor(Color.WHITE);
+        paint.setStyle(Paint.Style.FILL);
+
+        // Use 0.9f times the radius for the actual circle to account for icon normalization.
+        float radius = getPreviewBounds().width() * 0.5f;
+        canvas.drawCircle(DRAG_BITMAP_PADDING / 2 + radius,
+                DRAG_BITMAP_PADDING / 2 + radius, radius * 0.9f, paint);
+
+        HolographicOutlineHelper.obtain(mLauncher).applyExpensiveOutlineWithBlur(b, canvas);
+        canvas.setBitmap(null);
+        return b;
+    }
+}