1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.android.inputmethod.keyboard.internal;
import android.content.Context;
import android.util.Log;
import android.view.MotionEvent;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.MainKeyboardView;
import com.android.inputmethod.latin.LatinImeLogger;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.ResourceUtils;
import com.android.inputmethod.latin.define.ProductionFlag;
import com.android.inputmethod.research.ResearchLogger;
public final class SuddenJumpingTouchEventHandler {
private static final String TAG = SuddenJumpingTouchEventHandler.class.getSimpleName();
private static boolean DEBUG_MODE = LatinImeLogger.sDBG;
public interface ProcessMotionEvent {
public boolean processMotionEvent(MotionEvent me);
}
private final ProcessMotionEvent mView;
private final boolean mNeedsSuddenJumpingHack;
/** Whether we've started dropping move events because we found a big jump */
private boolean mDroppingEvents;
/**
* Whether multi-touch disambiguation needs to be disabled if a real multi-touch event has
* occured
*/
private boolean mDisableDisambiguation;
/** The distance threshold at which we start treating the touch session as a multi-touch */
private int mJumpThresholdSquare = Integer.MAX_VALUE;
private int mLastX;
private int mLastY;
public SuddenJumpingTouchEventHandler(Context context, ProcessMotionEvent view) {
mView = view;
mNeedsSuddenJumpingHack = Boolean.parseBoolean(ResourceUtils.getDeviceOverrideValue(
context.getResources(), R.array.sudden_jumping_touch_event_device_list, "false"));
}
public void setKeyboard(Keyboard newKeyboard) {
// One-seventh of the keyboard width seems like a reasonable threshold
final int jumpThreshold = newKeyboard.mOccupiedWidth / 7;
mJumpThresholdSquare = jumpThreshold * jumpThreshold;
}
/**
* This function checks to see if we need to handle any sudden jumps in the pointer location
* that could be due to a multi-touch being treated as a move by the firmware or hardware.
* Once a sudden jump is detected, all subsequent move events are discarded
* until an UP is received.<P>
* When a sudden jump is detected, an UP event is simulated at the last position and when
* the sudden moves subside, a DOWN event is simulated for the second key.
* @param me the motion event
* @return true if the event was consumed, so that it doesn't continue to be handled by
* {@link MainKeyboardView}.
*/
private boolean handleSuddenJumping(MotionEvent me) {
if (!mNeedsSuddenJumpingHack)
return false;
final int action = me.getAction();
final int x = (int) me.getX();
final int y = (int) me.getY();
boolean result = false;
// Real multi-touch event? Stop looking for sudden jumps
if (me.getPointerCount() > 1) {
mDisableDisambiguation = true;
}
if (mDisableDisambiguation) {
// If UP, reset the multi-touch flag
if (action == MotionEvent.ACTION_UP) mDisableDisambiguation = false;
return false;
}
switch (action) {
case MotionEvent.ACTION_DOWN:
// Reset the "session"
mDroppingEvents = false;
mDisableDisambiguation = false;
break;
case MotionEvent.ACTION_MOVE:
// Is this a big jump?
final int distanceSquare = (mLastX - x) * (mLastX - x) + (mLastY - y) * (mLastY - y);
// Check the distance.
if (distanceSquare > mJumpThresholdSquare) {
// If we're not yet dropping events, start dropping and send an UP event
if (!mDroppingEvents) {
mDroppingEvents = true;
// Send an up event
MotionEvent translated = MotionEvent.obtain(
me.getEventTime(), me.getEventTime(),
MotionEvent.ACTION_UP,
mLastX, mLastY, me.getMetaState());
mView.processMotionEvent(translated);
translated.recycle();
}
result = true;
} else if (mDroppingEvents) {
// If moves are small and we're already dropping events, continue dropping
result = true;
}
break;
case MotionEvent.ACTION_UP:
if (mDroppingEvents) {
// Send a down event first, as we dropped a bunch of sudden jumps and assume that
// the user is releasing the touch on the second key.
MotionEvent translated = MotionEvent.obtain(me.getEventTime(), me.getEventTime(),
MotionEvent.ACTION_DOWN,
x, y, me.getMetaState());
mView.processMotionEvent(translated);
translated.recycle();
mDroppingEvents = false;
// Let the up event get processed as well, result = false
}
break;
}
// Track the previous coordinate
mLastX = x;
mLastY = y;
return result;
}
public boolean onTouchEvent(MotionEvent me) {
// If there was a sudden jump, return without processing the actual motion event.
if (handleSuddenJumping(me)) {
if (DEBUG_MODE)
Log.w(TAG, "onTouchEvent: ignore sudden jump " + me);
if (ProductionFlag.IS_EXPERIMENTAL) {
ResearchLogger.suddenJumpingTouchEventHandler_onTouchEvent(me);
}
return true;
}
return mView.processMotionEvent(me);
}
}
|
