Animating the drag view scale up and down when dragging items.

Change-Id: Ic97d74a14964c6bdc23305b2d378b13a1f2e3664

1 files changed, 31 insertions, 34 deletions

diff --git a/src/com/android/launcher2/DragView.java b/src/com/android/launcher2/DragView.java
index 15d9c5449..90b2083a0 100644
--- a/src/com/android/launcher2/DragView.java
+++ b/src/com/android/launcher2/DragView.java
@@ -32,6 +32,8 @@ import android.view.animation.DecelerateInterpolator;
 import com.android.launcher.R;
 
 public class DragView extends View {
+    private static float sDragAlpha = 0.8f;
+
     private Bitmap mBitmap;
     private Bitmap mCrossFadeBitmap;
     private Paint mPaint;
@@ -48,8 +50,6 @@ public class DragView extends View {
     private float mOffsetX = 0.0f;
     private float mOffsetY = 0.0f;
 
-    private DragLayer.LayoutParams mLayoutParams;
-
     /**
      * Construct the drag view.
      * <p>
@@ -67,20 +67,14 @@ public class DragView extends View {
         mDragLayer = launcher.getDragLayer();
 
         final Resources res = getResources();
-        final int dragScale = res.getInteger(R.integer.config_dragViewExtraPixels);
-
-        Matrix scale = new Matrix();
-        final float scaleFactor = (width + dragScale) / width;
-        if (scaleFactor != 1.0f) {
-            scale.setScale(scaleFactor, scaleFactor);
-        }
-
-        final int offsetX = res.getDimensionPixelSize(R.dimen.dragViewOffsetX);
-        final int offsetY = res.getDimensionPixelSize(R.dimen.dragViewOffsetY);
+        final float offsetX = res.getDimensionPixelSize(R.dimen.dragViewOffsetX);
+        final float offsetY = res.getDimensionPixelSize(R.dimen.dragViewOffsetY);
+        final float scaleDps = res.getDimensionPixelSize(R.dimen.dragViewScale);
+        final float scale = (width + scaleDps) / width;
 
         // Animate the view into the correct position
         mAnim = ValueAnimator.ofFloat(0.0f, 1.0f);
-        mAnim.setDuration(110);
+        mAnim.setDuration(150);
         mAnim.setInterpolator(new DecelerateInterpolator(2.5f));
         mAnim.addUpdateListener(new AnimatorUpdateListener() {
             @Override
@@ -92,19 +86,20 @@ public class DragView extends View {
 
                 mOffsetX += deltaX;
                 mOffsetY += deltaY;
+                setScaleX(1f + (value * (scale - 1f)));
+                setScaleY(1f + (value * (scale - 1f)));
+                setAlpha(sDragAlpha * value + (1f - value));
 
                 if (getParent() == null) {
                     animation.cancel();
                 } else {
-                    DragLayer.LayoutParams lp = mLayoutParams;
-                    lp.x += deltaX;
-                    lp.y += deltaY;
-                    mDragLayer.requestLayout();
+                    setTranslationX(getTranslationX() + deltaX);
+                    setTranslationY(getTranslationY() + deltaY);
                 }
             }
         });
 
-        mBitmap = Bitmap.createBitmap(bitmap, left, top, width, height, scale, true);
+        mBitmap = Bitmap.createBitmap(bitmap, left, top, width, height);
         setDragRegion(new Rect(0, 0, width, height));
 
         // The point in our scaled bitmap that the touch events are located
@@ -236,14 +231,24 @@ public class DragView extends View {
         DragLayer.LayoutParams lp = new DragLayer.LayoutParams(0, 0);
         lp.width = mBitmap.getWidth();
         lp.height = mBitmap.getHeight();
-        lp.x = touchX - mRegistrationX;
-        lp.y = touchY - mRegistrationY;
         lp.customPosition = true;
         setLayoutParams(lp);
-        mLayoutParams = lp;
+        setTranslationX(touchX - mRegistrationX);
+        setTranslationY(touchY - mRegistrationY);
         mAnim.start();
     }
 
+    public void cancelAnimation() {
+        if (mAnim != null && mAnim.isRunning()) {
+            mAnim.cancel();
+        }
+    }
+
+    public void resetLayoutParams() {
+        mOffsetX = mOffsetY = 0;
+        requestLayout();
+    }
+
     /**
      * Move the window containing this view.
      *
@@ -251,22 +256,14 @@ public class DragView extends View {
      * @param touchY the y coordinate the user touched in DragLayer coordinates
      */
     void move(int touchX, int touchY) {
-        DragLayer.LayoutParams lp = mLayoutParams;
-        lp.x = touchX - mRegistrationX + (int) mOffsetX;
-        lp.y = touchY - mRegistrationY + (int) mOffsetY;
-        mDragLayer.requestLayout();
+        setTranslationX(touchX - mRegistrationX + (int) mOffsetX);
+        setTranslationY(touchY - mRegistrationY + (int) mOffsetY);
     }
 
     void remove() {
-        mDragLayer.removeView(DragView.this);
-    }
-
-    int[] getPosition(int[] result) {
-        DragLayer.LayoutParams lp = mLayoutParams;
-        if (result == null) result = new int[2];
-        result[0] = lp.x;
-        result[1] = lp.y;
-        return result;
+        if (getParent() != null) {
+            mDragLayer.removeView(DragView.this);
+        }
     }
 }