android: move scrollBy & scaleWithFocus to PZC (Fennec Import)

Change-Id: Ie0d23b302994134f9d382e255b0408f7c9f1c1fb

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/LayerController.java

@@ -135,18 +135,6 @@ public class LayerController implements PanZoomTarget {
         }
     }
 
-    /** Scrolls the viewport by the given offset. You must hold the monitor while calling this. */
-    public void scrollBy(PointF point) {
-        ViewportMetrics viewportMetrics = new ViewportMetrics(mViewportMetrics);
-        PointF origin = viewportMetrics.getOrigin();
-        origin.offset(point.x, point.y);
-        viewportMetrics.setOrigin(origin);
-        mViewportMetrics = new ImmutableViewportMetrics(viewportMetrics);
-
-        notifyLayerClientOfGeometryChange();
-        mView.requestRender();
-    }
-
     /** Sets the current page rect. You must hold the monitor while calling this. */
     public void setPageRect(RectF rect, RectF cssRect) {
         // Since the "rect" is always just a multiple of "cssRect" we don't need to
@@ -193,21 +181,6 @@ public class LayerController implements PanZoomTarget {
         }
     }
 
-    /**
-     * Scales the viewport, keeping the given focus point in the same place before and after the
-     * scale operation. You must hold the monitor while calling this.
-     */
-    public void scaleWithFocus(float zoomFactor, PointF focus) {
-        ViewportMetrics viewportMetrics = new ViewportMetrics(mViewportMetrics);
-        viewportMetrics.scaleTo(zoomFactor, focus);
-        mViewportMetrics = new ImmutableViewportMetrics(viewportMetrics);
-
-        // We assume the zoom level will only be modified by the
-        // PanZoomController, so no need to notify it of this change.
-        notifyLayerClientOfGeometryChange();
-        mView.requestRender();
-    }
-
     public boolean post(Runnable action) { return mView.post(action); }
 
     /**

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/PanZoomController.java

@@ -133,6 +133,10 @@ public class PanZoomController
         return mTarget.getViewportMetrics();
     }
 
+    private ViewportMetrics getMutableMetrics() {
+        return new ViewportMetrics(getMetrics());
+    }
+
     // for debugging bug 713011; it can be taken out once that is resolved.
     private void checkMainThread() {
         if (mMainThread != Thread.currentThread()) {
@@ -225,7 +229,7 @@ public class PanZoomController
         if (mState == PanZoomState.NOTHING) {
             synchronized (mTarget.getLock()) {
                 ViewportMetrics validated = getValidViewportMetrics();
-                if (! (new ViewportMetrics(getMetrics())).fuzzyEquals(validated)) {
+                if (! getMutableMetrics().fuzzyEquals(validated)) {
                     // page size changed such that we are now in overscroll. snap to the
                     // the nearest valid viewport
                     mTarget.setViewportMetrics(validated);
@@ -449,6 +453,16 @@ public class PanZoomController
         updatePosition();
     }
 
+    private void scrollBy(PointF point) {
+        ViewportMetrics viewportMetrics = getMutableMetrics();
+        PointF origin = viewportMetrics.getOrigin();
+        origin.offset(point.x, point.y);
+        viewportMetrics.setOrigin(origin);
+
+        mTarget.setViewportMetrics(viewportMetrics);
+        mTarget.notifyLayerClientOfGeometryChange();
+    }
+
     private void fling() {
         updatePosition();
 
@@ -465,7 +479,7 @@ public class PanZoomController
     private void bounce(ViewportMetrics metrics) {
         stopAnimationTimer();
 
-        ViewportMetrics bounceStartMetrics = new ViewportMetrics(getMetrics());
+        ViewportMetrics bounceStartMetrics = getMutableMetrics();
         if (bounceStartMetrics.fuzzyEquals(metrics)) {
             setState(PanZoomState.NOTHING);
             return;
@@ -539,7 +553,7 @@ public class PanZoomController
         }
         if (! mSubscroller.scrollBy(displacement)) {
             synchronized (mTarget.getLock()) {
-                mTarget.scrollBy(displacement);
+                scrollBy(displacement);
             }
         }
     }
@@ -690,7 +704,7 @@ public class PanZoomController
 
     /* Returns the nearest viewport metrics with no overscroll visible. */
     private ViewportMetrics getValidViewportMetrics() {
-        return getValidViewportMetrics(new ViewportMetrics(getMetrics()));
+        return getValidViewportMetrics(getMutableMetrics());
     }
 
     private ViewportMetrics getValidViewportMetrics(ViewportMetrics viewportMetrics) {
@@ -848,10 +862,10 @@ public class PanZoomController
                 newZoomFactor = maxZoomFactor + excessZoom;
             }
 
-            mTarget.scrollBy(new PointF(mLastZoomFocus.x - detector.getFocusX(),
+            scrollBy(new PointF(mLastZoomFocus.x - detector.getFocusX(),
                     mLastZoomFocus.y - detector.getFocusY()));
             PointF focus = new PointF(detector.getFocusX(), detector.getFocusY());
-            mTarget.scaleWithFocus(newZoomFactor, focus);
+            scaleWithFocus(newZoomFactor, focus);
         }
 
         mLastZoomFocus.set(detector.getFocusX(), detector.getFocusY());
@@ -872,6 +886,17 @@ public class PanZoomController
         mTarget.notifyLayerClientOfGeometryChange();
     }
 
+    /**
+     * Scales the viewport, keeping the given focus point in the same place before and after the
+     * scale operation. You must hold the monitor while calling this.
+     */
+    private void scaleWithFocus(float zoomFactor, PointF focus) {
+        ViewportMetrics viewportMetrics = getMutableMetrics();
+        viewportMetrics.scaleTo(zoomFactor, focus);
+        mTarget.setViewportMetrics(viewportMetrics);
+        mTarget.notifyLayerClientOfGeometryChange();
+    }
+
     public boolean getRedrawHint() {
         switch (mState) {
             case PINCHING:
@@ -944,7 +969,7 @@ public class PanZoomController
 
         float finalZoom = viewport.width() / zoomToRect.width();
 
-        ViewportMetrics finalMetrics = new ViewportMetrics(getMetrics());
+        ViewportMetrics finalMetrics = getMutableMetrics();
         finalMetrics.setOrigin(new PointF(zoomToRect.left * finalMetrics.getZoomFactor(),
                                           zoomToRect.top * finalMetrics.getZoomFactor()));
         finalMetrics.scaleTo(finalZoom, new PointF(0.0f, 0.0f));

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/ui/PanZoomTarget.java

@@ -17,8 +17,6 @@ public interface PanZoomTarget {
 
     public void setAnimationTarget(ViewportMetrics viewport);
     public void setViewportMetrics(ViewportMetrics viewport);
-    public void scrollBy(PointF point);
-    public void scaleWithFocus(float zoomFactor, PointF focus);
 
     public void notifyLayerClientOfGeometryChange();
     public void setForceRedraw();