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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 package org.chromium.content_public.browser;
      6 
      7 /**
      8  * A class that is notified of events and state changes related to gesture processing from
      9  * the ContentViewCore.
     10  */
     11 public class GestureStateListener {
     12     /**
     13      * Called when the pinch gesture starts.
     14      */
     15     public void onPinchStarted() {}
     16 
     17     /**
     18      * Called when the pinch gesture ends.
     19      */
     20     public void onPinchEnded() {}
     21 
     22     /**
     23      * Called when a fling starts.
     24      */
     25     public void onFlingStartGesture(int vx, int vy, int scrollOffsetY, int scrollExtentY) {}
     26 
     27     /**
     28      * Called when a fling is cancelled.
     29      */
     30     public void onFlingCancelGesture() {}
     31 
     32     /**
     33      * Called when a fling has ended.
     34      */
     35     public void onFlingEndGesture(int scrollOffsetY, int scrollExtentY) {}
     36 
     37     /**
     38      * Called when a fling event was not handled by the renderer.
     39      */
     40     public void onUnhandledFlingStartEvent(int vx, int vy) {}
     41 
     42     /**
     43      * Called to indicate that a scroll update gesture had been consumed by the page.
     44      * This callback is called whenever any layer is scrolled (like a frame or div). It is
     45      * not called when a JS touch handler consumes the event (preventDefault), it is not called
     46      * for JS-initiated scrolling.
     47      */
     48     public void onScrollUpdateGestureConsumed() {}
     49 
     50     /*
     51      * Called when a scroll gesture has started.
     52      */
     53     public void onScrollStarted(int scrollOffsetY, int scrollExtentY) {}
     54 
     55     /*
     56      * Called when a scroll gesture has stopped.
     57      */
     58     public void onScrollEnded(int scrollOffsetY, int scrollExtentY) {}
     59 
     60     /*
     61      * Called when the scroll offsets or extents may have changed.
     62      */
     63     public void onScrollOffsetOrExtentChanged(int scrollOffsetY, int scrollExtentY) {}
     64 
     65     /*
     66      * Called after a single-tap gesture event was dispatched to the renderer,
     67      * indicating whether or not the gesture was consumed.
     68      */
     69     public void onSingleTap(boolean consumed, int x, int y) {}
     70 }
     71