GestureStateListener.java revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
1b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov// Copyright 2014 The Chromium Authors. All rights reserved.
2b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov// Use of this source code is governed by a BSD-style license that can be
3b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov// found in the LICENSE file.
4b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov
5b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobovpackage org.chromium.content_public.browser;
6b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov
7b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov/**
8b161955ffbda5ccb5293e0c76ef982acb6ec6661Artyom Skrobov * A class that is notified of events and state changes related to gesture processing from
9 * the ContentViewCore.
10 */
11public 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