Increasing the size of the drag icon when a shortcut is dragged

Change-Id: I7d768657300d3229e05d1eb18aec3720a9098ffc

1 files changed, 155 insertions, 0 deletions

diff --git a/src/com/android/launcher3/graphics/DragPreviewProvider.java b/src/com/android/launcher3/graphics/DragPreviewProvider.java
new file mode 100644
index 000000000..a00bc923a
--- /dev/null
+++ b/src/com/android/launcher3/graphics/DragPreviewProvider.java
@@ -0,0 +1,155 @@
+/*
+ * 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.graphics;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.graphics.Region.Op;
+import android.graphics.drawable.Drawable;
+import android.view.View;
+import android.widget.TextView;
+
+import com.android.launcher3.HolographicOutlineHelper;
+import com.android.launcher3.PreloadIconDrawable;
+import com.android.launcher3.R;
+import com.android.launcher3.Workspace;
+import com.android.launcher3.folder.FolderIcon;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * A utility class to generate preview bitmap for dragging.
+ */
+public class DragPreviewProvider {
+
+    public static final int DRAG_BITMAP_PADDING = 2;
+
+    private final Rect mTempRect = new Rect();
+
+    protected final View mView;
+
+    // The padding added to the drag view during the preview generation.
+    public final int previewPadding;
+
+    public DragPreviewProvider(View view) {
+        mView = view;
+
+        if (mView instanceof TextView) {
+            Drawable d = Workspace.getTextViewIcon((TextView) mView);
+            Rect bounds = getDrawableBounds(d);
+            previewPadding = DRAG_BITMAP_PADDING - bounds.left - bounds.top;
+        } else {
+            previewPadding = DRAG_BITMAP_PADDING;
+        }
+    }
+
+    /**
+     * Draw the View v into the given Canvas.
+     *
+     * @param destCanvas the canvas to draw on
+     */
+    private void drawDragView(Canvas destCanvas) {
+        destCanvas.save();
+        if (mView instanceof TextView) {
+            Drawable d = Workspace.getTextViewIcon((TextView) mView);
+            Rect bounds = getDrawableBounds(d);
+            destCanvas.translate(DRAG_BITMAP_PADDING / 2 - bounds.left,
+                    DRAG_BITMAP_PADDING / 2 - bounds.top);
+            d.draw(destCanvas);
+        } else {
+            final Rect clipRect = mTempRect;
+            mView.getDrawingRect(clipRect);
+
+            boolean textVisible = false;
+            if (mView instanceof FolderIcon) {
+                // For FolderIcons the text can bleed into the icon area, and so we need to
+                // hide the text completely (which can't be achieved by clipping).
+                if (((FolderIcon) mView).getTextVisible()) {
+                    ((FolderIcon) mView).setTextVisible(false);
+                    textVisible = true;
+                }
+            }
+            destCanvas.translate(-mView.getScrollX() + DRAG_BITMAP_PADDING / 2,
+                    -mView.getScrollY() + DRAG_BITMAP_PADDING / 2);
+            destCanvas.clipRect(clipRect, Op.REPLACE);
+            mView.draw(destCanvas);
+
+            // Restore text visibility of FolderIcon if necessary
+            if (textVisible) {
+                ((FolderIcon) mView).setTextVisible(true);
+            }
+        }
+        destCanvas.restore();
+    }
+
+    /**
+     * Returns a new bitmap to show when the given View is being dragged around.
+     * Responsibility for the bitmap is transferred to the caller.
+     */
+    public Bitmap createDragBitmap(Canvas canvas) {
+        Bitmap b;
+
+        if (mView instanceof TextView) {
+            Drawable d = Workspace.getTextViewIcon((TextView) mView);
+            Rect bounds = getDrawableBounds(d);
+            b = Bitmap.createBitmap(bounds.width() + DRAG_BITMAP_PADDING,
+                    bounds.height() + DRAG_BITMAP_PADDING, Bitmap.Config.ARGB_8888);
+        } else {
+            b = Bitmap.createBitmap(mView.getWidth() + DRAG_BITMAP_PADDING,
+                    mView.getHeight() + DRAG_BITMAP_PADDING, Bitmap.Config.ARGB_8888);
+        }
+
+        canvas.setBitmap(b);
+        drawDragView(canvas);
+        canvas.setBitmap(null);
+
+        return b;
+    }
+
+    /**
+     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
+     * Responsibility for the bitmap is transferred to the caller.
+     */
+    public Bitmap createDragOutline(Canvas canvas) {
+        final int outlineColor = mView.getResources().getColor(R.color.outline_color);
+        final Bitmap b = Bitmap.createBitmap(mView.getWidth() + DRAG_BITMAP_PADDING,
+                mView.getHeight() + DRAG_BITMAP_PADDING, Bitmap.Config.ARGB_8888);
+
+        canvas.setBitmap(b);
+        drawDragView(canvas);
+        HolographicOutlineHelper.obtain(mView.getContext())
+                .applyExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor);
+        canvas.setBitmap(null);
+        return b;
+    }
+
+    protected static Rect getDrawableBounds(Drawable d) {
+        Rect bounds = new Rect();
+        d.copyBounds(bounds);
+        if (bounds.width() == 0 || bounds.height() == 0) {
+            bounds.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
+        } else {
+            bounds.offsetTo(0, 0);
+        }
+        if (d instanceof PreloadIconDrawable) {
+            int inset = -((PreloadIconDrawable) d).getOutset();
+            bounds.inset(inset, inset);
+        }
+        return bounds;
+    }
+}