Adding the ability to scale the hotseat or items in the hotseat

--> A bunch of stuff breaks when scaling the hotseat. More specifically,
    drag and drop animations between hotseat and workspace,
    scaling on pick up, folder animations, determination of
    item placement. This CL fixes these issues so that the
    hotseat or hotseat items are ready to be scaled.
--> For now, using 90% scale factor for 7-inch+ UIs

Change-Id: Iac098409347e76139e4d726a071397b56ac684d2

src/com/android/launcher2/CellLayout.java

@@ -138,6 +138,7 @@ public class CellLayout extends ViewGroup {
     private ShortcutAndWidgetContainer mShortcutsAndWidgets;
 
     private boolean mIsHotseat = false;
+    private float mHotseatScale = 1f;
 
     public static final int MODE_DRAG_OVER = 0;
     public static final int MODE_ON_DROP = 1;
@@ -200,6 +201,7 @@ public class CellLayout extends ViewGroup {
         setAlwaysDrawnWithCacheEnabled(false);
 
         final Resources res = getResources();
+        mHotseatScale = (res.getInteger(R.integer.hotseat_item_scale_percentage) / 100f);
 
         mNormalBackground = res.getDrawable(R.drawable.homescreen_blue_normal_holo);
         mActiveGlowBackground = res.getDrawable(R.drawable.homescreen_blue_strong_holo);
@@ -317,6 +319,10 @@ public class CellLayout extends ViewGroup {
         mShortcutsAndWidgets.buildLayer();
     }
 
+    public float getChildrenScale() {
+        return mIsHotseat ? mHotseatScale : 1.0f;
+    }
+
     public void setGridSize(int x, int y) {
         mCountX = x;
         mCountY = y;
@@ -387,6 +393,25 @@ public class CellLayout extends ViewGroup {
         }
     }
 
+    public void scaleRect(Rect r, float scale) {
+        if (scale != 1.0f) {
+            r.left = (int) (r.left * scale + 0.5f);
+            r.top = (int) (r.top * scale + 0.5f);
+            r.right = (int) (r.right * scale + 0.5f);
+            r.bottom = (int) (r.bottom * scale + 0.5f);
+        }
+    }
+
+    Rect temp = new Rect();
+    void scaleRectAboutCenter(Rect in, Rect out, float scale) {
+        int cx = in.centerX();
+        int cy = in.centerY();
+        out.set(in);
+        out.offset(-cx, -cy);
+        scaleRect(out, scale);
+        out.offset(cx, cy);
+    }
+
     @Override
     protected void onDraw(Canvas canvas) {
         // When we're large, we are either drawn in a "hover" state (ie when dragging an item to
@@ -414,9 +439,10 @@ public class CellLayout extends ViewGroup {
             final float alpha = mDragOutlineAlphas[i];
             if (alpha > 0) {
                 final Rect r = mDragOutlines[i];
+                scaleRectAboutCenter(r, temp, getChildrenScale());
                 final Bitmap b = (Bitmap) mDragOutlineAnims[i].getTag();
                 paint.setAlpha((int)(alpha + .5f));
-                canvas.drawBitmap(b, null, r, paint);
+                canvas.drawBitmap(b, null, temp, paint);
             }
         }
 
@@ -591,6 +617,9 @@ public class CellLayout extends ViewGroup {
             }
         }
 
+        child.setScaleX(getChildrenScale());
+        child.setScaleY(getChildrenScale());
+
         // Generate an id for each view, this assumes we have at most 256x256 cells
         // per workspace screen
         if (lp.cellX >= 0 && lp.cellX <= mCountX - 1 && lp.cellY >= 0 && lp.cellY <= mCountY - 1) {
@@ -2072,11 +2101,8 @@ public class CellLayout extends ViewGroup {
             }
             initDeltaX = child.getTranslationX();
             initDeltaY = child.getTranslationY();
-            finalScale = 1.0f - 4.0f / child.getWidth();
+            finalScale = getChildrenScale() - 4.0f / child.getWidth();
             initScale = child.getScaleX();
-
-            child.setPivotY(child.getMeasuredHeight() * 0.5f);
-            child.setPivotX(child.getMeasuredWidth() * 0.5f);
             this.child = child;
         }
 
@@ -2117,7 +2143,7 @@ public class CellLayout extends ViewGroup {
                     // We make sure to end only after a full period
                     initDeltaX = 0;
                     initDeltaY = 0;
-                    initScale = 1.0f;
+                    initScale = getChildrenScale();
                 }
             });
             mShakeAnimators.put(child, this);
@@ -2138,8 +2164,8 @@ public class CellLayout extends ViewGroup {
             AnimatorSet s = LauncherAnimUtils.createAnimatorSet();
             a = s;
             s.playTogether(
-                LauncherAnimUtils.ofFloat(child, "scaleX", 1f),
-                LauncherAnimUtils.ofFloat(child, "scaleY", 1f),
+                LauncherAnimUtils.ofFloat(child, "scaleX", getChildrenScale()),
+                LauncherAnimUtils.ofFloat(child, "scaleY", getChildrenScale()),
                 LauncherAnimUtils.ofFloat(child, "translationX", 0f),
                 LauncherAnimUtils.ofFloat(child, "translationY", 0f)
             );