Updating the preview generation logic so that it aligns better with

the drag source image

> Using common code for pending item drag (WidgetContainerView and PinItemDragListener)
> Adding a shortcut-circuit in Workspace when a pendingItem can create a shortcut
  directly. Previously the multi-window drop was routing through onActivityResult which
  was causing some state information to be lost.

Bug: 33584624
Change-Id: I0259870032185713caa9bff27092dbae6ce91199

1 files changed, 191 insertions, 0 deletions

diff --git a/src/com/android/launcher3/widget/PendingItemDragHelper.java b/src/com/android/launcher3/widget/PendingItemDragHelper.java
new file mode 100644
index 000000000..a4698c292
--- /dev/null
+++ b/src/com/android/launcher3/widget/PendingItemDragHelper.java
@@ -0,0 +1,191 @@
+/*
+ * 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.widget;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.view.View;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.DragSource;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.PendingAddItemInfo;
+import com.android.launcher3.Workspace;
+import com.android.launcher3.dragndrop.DragOptions;
+import com.android.launcher3.graphics.DragPreviewProvider;
+import com.android.launcher3.graphics.HolographicOutlineHelper;
+import com.android.launcher3.graphics.LauncherIcons;
+
+/**
+ * Extension of {@link DragPreviewProvider} with logic specific to pending widgets/shortcuts
+ * dragged from the widget tray.
+ */
+public class PendingItemDragHelper extends DragPreviewProvider {
+
+    private static final float MAX_WIDGET_SCALE = 1.25f;
+
+    private final PendingAddItemInfo mAddInfo;
+
+    private Bitmap mPreviewBitmap;
+
+    public PendingItemDragHelper(View view) {
+        super(view);
+        mAddInfo = (PendingAddItemInfo) view.getTag();
+    }
+
+    /**
+     * Starts the drag for the pending item associated with the view.
+     *
+     * @param previewBounds The bounds where the image was displayed,
+     *                      {@link WidgetImageView#getBitmapBounds()}
+     * @param previewBitmapWidth The actual width of the bitmap displayed in the view.
+     * @param previewViewWidth The width of {@link WidgetImageView} displaying the preview
+     * @param screenPos Position of {@link WidgetImageView} on the screen
+     */
+    public void startDrag(Rect previewBounds, int previewBitmapWidth, int previewViewWidth,
+            Point screenPos, DragSource source, DragOptions options) {
+        final Launcher launcher = Launcher.getLauncher(mView.getContext());
+        LauncherAppState app = LauncherAppState.getInstance(launcher);
+
+        final Bitmap preview;
+        final float scale;
+        final Point dragOffset;
+        final Rect dragRegion;
+
+
+        if (mAddInfo instanceof PendingAddWidgetInfo) {
+            PendingAddWidgetInfo createWidgetInfo = (PendingAddWidgetInfo) mAddInfo;
+            int[] size = launcher.getWorkspace().estimateItemSize(createWidgetInfo, true, false);
+
+            int maxWidth = Math.min((int) (previewBitmapWidth * MAX_WIDGET_SCALE), size[0]);
+
+            int[] previewSizeBeforeScale = new int[1];
+            preview = app.getWidgetCache() .generateWidgetPreview(
+                    launcher, createWidgetInfo.info, maxWidth, null, previewSizeBeforeScale);
+
+            if (previewSizeBeforeScale[0] < previewBitmapWidth) {
+                // The icon has extra padding around it.
+                int padding = (previewBitmapWidth - previewSizeBeforeScale[0]) / 2;
+                if (previewBitmapWidth > previewViewWidth) {
+                    padding = padding * previewViewWidth / previewBitmapWidth;
+                }
+
+                previewBounds.left += padding;
+                previewBounds.right -= padding;
+            }
+            scale = previewBounds.width() / (float) preview.getWidth();
+            launcher.getDragController().addDragListener(new WidgetHostViewLoader(launcher, mView));
+
+            dragOffset = null;
+            dragRegion = null;
+        } else {
+            PendingAddShortcutInfo createShortcutInfo = (PendingAddShortcutInfo) mAddInfo;
+            Drawable icon = createShortcutInfo.activityInfo.getFullResIcon(app.getIconCache());
+            preview = LauncherIcons.createScaledBitmapWithoutShadow(icon, launcher);
+            mAddInfo.spanX = mAddInfo.spanY = 1;
+            scale = ((float) launcher.getDeviceProfile().iconSizePx) / preview.getWidth();
+
+            dragOffset = new Point(previewPadding / 2, previewPadding / 2);
+
+            // Create a preview same as the workspace cell size and draw the icon at the
+            // appropriate position.
+            int[] size = launcher.getWorkspace().estimateItemSize(mAddInfo, false, true);
+            DeviceProfile dp = launcher.getDeviceProfile();
+            int iconSize = dp.iconSizePx;
+
+            dragRegion = new Rect();
+            dragRegion.left = (size[0] - iconSize) / 2;
+            dragRegion.right = dragRegion.left + iconSize;
+            dragRegion.top = (size[1] - iconSize - dp.iconTextSizePx - dp.iconDrawablePaddingPx) / 2;
+            dragRegion.bottom = dragRegion.top + iconSize;
+        }
+
+        // Since we are not going through the workspace for starting the drag, set drag related
+        // information on the workspace before starting the drag.
+        launcher.getWorkspace().prepareDragWithProvider(this);
+
+        int dragLayerX = screenPos.x + previewBounds.left
+                + (int) ((scale * preview.getWidth() - preview.getWidth()) / 2);
+        int dragLayerY = screenPos.y + previewBounds.top
+                + (int) ((scale * preview.getHeight() - preview.getHeight()) / 2);
+
+        mPreviewBitmap = preview;
+        // Start the drag
+        launcher.getDragController().startDrag(preview, dragLayerX, dragLayerY, source, mAddInfo,
+                dragOffset, dragRegion, scale, options);
+    }
+
+
+    @Override
+    public Bitmap createDragOutline(Canvas canvas) {
+        if (mAddInfo instanceof PendingAddShortcutInfo) {
+            int width = mPreviewBitmap.getWidth();
+            int height = mPreviewBitmap.getHeight();
+            Bitmap b = Bitmap.createBitmap(width + blurSizeOutline, height + blurSizeOutline,
+                    Bitmap.Config.ALPHA_8);
+            canvas.setBitmap(b);
+
+            Launcher launcher = Launcher.getLauncher(mView.getContext());
+            int size = launcher.getDeviceProfile().iconSizePx;
+
+            Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
+            Rect dst = new Rect(0, 0, size, size);
+            dst.offset(blurSizeOutline / 2, blurSizeOutline / 2);
+            canvas.drawBitmap(mPreviewBitmap, src, dst, new Paint(Paint.FILTER_BITMAP_FLAG));
+
+            HolographicOutlineHelper.getInstance(mView.getContext())
+                    .applyExpensiveOutlineWithBlur(b, canvas);
+
+            canvas.setBitmap(null);
+            return b;
+        }
+
+        Workspace workspace = Launcher.getLauncher(mView.getContext()).getWorkspace();
+        int[] size = workspace.estimateItemSize(mAddInfo, false, false);
+
+        int w = size[0];
+        int h = size[1];
+        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ALPHA_8);
+        canvas.setBitmap(b);
+
+        Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
+        float scaleFactor = Math.min((w - blurSizeOutline) / (float) mPreviewBitmap.getWidth(),
+                (h - blurSizeOutline) / (float) mPreviewBitmap.getHeight());
+        int scaledWidth = (int) (scaleFactor * mPreviewBitmap.getWidth());
+        int scaledHeight = (int) (scaleFactor * mPreviewBitmap.getHeight());
+        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
+
+        // center the image
+        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
+
+        canvas.drawBitmap(mPreviewBitmap, src, dst, null);
+
+        // Don't clip alpha values for the drag outline if we're using the default widget preview
+        boolean clipAlpha = !(mAddInfo instanceof PendingAddWidgetInfo &&
+                (((PendingAddWidgetInfo) mAddInfo).previewImage == 0));
+        HolographicOutlineHelper.getInstance(mView.getContext())
+                .applyExpensiveOutlineWithBlur(b, canvas, clipAlpha);
+        canvas.setBitmap(null);
+
+        return b;
+    }
+}