Java example source code file (CRobot.m)
The CRobot.m Java example source code
/*
* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#import <JavaNativeFoundation/JavaNativeFoundation.h>
#import <ApplicationServices/ApplicationServices.h>
#import "LWCToolkit.h"
#import "sun_lwawt_macosx_CRobot.h"
#import "java_awt_event_InputEvent.h"
#import "sizecalc.h"
// Starting number for event numbers generated by Robot.
// Apple docs don't mention at all what are the requirements
// for these numbers. It seems that they must be higher
// than event numbers from real events, which start at some
// value close to zero. There is no API for obtaining current
// event number, so we have to start from some random number.
// 32000 as starting value works for me, let's hope that it will
// work for others as well.
#define ROBOT_EVENT_NUMBER_START 32000
#define k_JAVA_ROBOT_WHEEL_COUNT 1
#if !defined(kCGBitmapByteOrder32Host)
#define kCGBitmapByteOrder32Host 0
#endif
// In OS X, left and right mouse button share the same click count.
// That is, if one starts clicking the left button rapidly and then
// switches to the right button, then the click count will continue
// increasing, without dropping to 1 in between. The middle button,
// however, has its own click count.
// For robot, we aren't going to emulate all that complexity. All our
// synhtetic clicks share the same click count.
static int gsClickCount;
static NSTimeInterval gsLastClickTime;
// Apparently, for mouse up/down events we have to set an event number
// that is incremented on each button press. Otherwise, strange things
// happen with z-order.
static int gsEventNumber;
static int* gsButtonEventNumber;
static inline CGKeyCode GetCGKeyCode(jint javaKeyCode);
static void PostMouseEvent(const CGPoint point, CGMouseButton button,
CGEventType type, int clickCount, int eventNumber);
static int GetClickCount(BOOL isDown);
static void
CreateJavaException(JNIEnv* env, CGError err)
{
// Throw a java exception indicating what is wrong.
NSString* s = [NSString stringWithFormat:@"Robot: CGError: %d", err];
(*env)->ThrowNew(env, (*env)->FindClass(env, "java/awt/AWTException"),
[s UTF8String]);
}
/*
* Class: sun_lwawt_macosx_CRobot
* Method: initRobot
* Signature: (V)V
*/
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_CRobot_initRobot
(JNIEnv *env, jobject peer)
{
// Set things up to let our app act like a synthetic keyboard and mouse.
// Always set all states, in case Apple ever changes default behaviors.
static int setupDone = 0;
if (!setupDone) {
int i;
jint* tmp;
jboolean copy = JNI_FALSE;
setupDone = 1;
// Don't block local events after posting ours
CGSetLocalEventsSuppressionInterval(0.0);
// Let our event's modifier key state blend with local hardware events
CGEnableEventStateCombining(TRUE);
// Don't let our events block local hardware events
CGSetLocalEventsFilterDuringSupressionState(
kCGEventFilterMaskPermitAllEvents,
kCGEventSupressionStateSupressionInterval);
CGSetLocalEventsFilterDuringSupressionState(
kCGEventFilterMaskPermitAllEvents,
kCGEventSupressionStateRemoteMouseDrag);
gsClickCount = 0;
gsLastClickTime = 0;
gsEventNumber = ROBOT_EVENT_NUMBER_START;
gsButtonEventNumber = (int*)SAFE_SIZE_ARRAY_ALLOC(malloc, sizeof(int), gNumberOfButtons);
if (gsButtonEventNumber == NULL) {
JNU_ThrowOutOfMemoryError(env, NULL);
return;
}
for (i = 0; i < gNumberOfButtons; ++i) {
gsButtonEventNumber[i] = ROBOT_EVENT_NUMBER_START;
}
}
}
/*
* Class: sun_lwawt_macosx_CRobot
* Method: mouseEvent
* Signature: (IIIIZZ)V
*/
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_CRobot_mouseEvent
(JNIEnv *env, jobject peer,
jint displayID, jint mouseLastX, jint mouseLastY, jint buttonsState,
jboolean isButtonsDownState, jboolean isMouseMove)
{
JNF_COCOA_ENTER(env);
// This is the native method called when Robot mouse events occur.
// The CRobot tracks the mouse position, and which button was
// pressed. If the mouse position is unknown it is obtained from
// CGEvents. The peer also tracks the mouse button desired state,
// the appropriate key modifier state, and whether the mouse action
// is simply a mouse move with no mouse button state changes.
CGError err = kCGErrorSuccess;
CGRect globalDeviceBounds = CGDisplayBounds(displayID);
// Set unknown mouse location, if needed.
if ((mouseLastX == sun_lwawt_macosx_CRobot_MOUSE_LOCATION_UNKNOWN) ||
(mouseLastY == sun_lwawt_macosx_CRobot_MOUSE_LOCATION_UNKNOWN))
{
CGEventRef event = CGEventCreate(NULL);
if (event == NULL) {
return;
}
CGPoint globalPos = CGEventGetLocation(event);
CFRelease(event);
// Normalize the coords within this display device, as
// per Robot rules.
if (globalPos.x < CGRectGetMinX(globalDeviceBounds)) {
globalPos.x = CGRectGetMinX(globalDeviceBounds);
}
else if (globalPos.x > CGRectGetMaxX(globalDeviceBounds)) {
globalPos.x = CGRectGetMaxX(globalDeviceBounds);
}
if (globalPos.y < CGRectGetMinY(globalDeviceBounds)) {
globalPos.y = CGRectGetMinY(globalDeviceBounds);
}
else if (globalPos.y > CGRectGetMaxY(globalDeviceBounds)) {
globalPos.y = CGRectGetMaxY(globalDeviceBounds);
}
mouseLastX = (jint)globalPos.x;
mouseLastY = (jint)globalPos.y;
}
// volatile, otherwise it warns that it might be clobbered by 'longjmp'
volatile CGPoint point;
// Translate the device relative point into a valid global CGPoint.
point.x = mouseLastX + globalDeviceBounds.origin.x;
point.y = mouseLastY + globalDeviceBounds.origin.y;
__block CGMouseButton button = kCGMouseButtonLeft;
__block CGEventType type = kCGEventMouseMoved;
void (^HandleRobotButton)(CGMouseButton, CGEventType, CGEventType, CGEventType) =
^(CGMouseButton cgButton, CGEventType cgButtonUp, CGEventType cgButtonDown,
CGEventType cgButtonDragged) {
button = cgButton;
type = cgButtonUp;
if (isButtonsDownState) {
if (isMouseMove) {
type = cgButtonDragged;
} else {
type = cgButtonDown;
}
}
};
// Left
if (buttonsState & java_awt_event_InputEvent_BUTTON1_MASK ||
buttonsState & java_awt_event_InputEvent_BUTTON1_DOWN_MASK ) {
HandleRobotButton(kCGMouseButtonLeft, kCGEventLeftMouseUp,
kCGEventLeftMouseDown, kCGEventLeftMouseDragged);
}
// Other
if (buttonsState & java_awt_event_InputEvent_BUTTON2_MASK ||
buttonsState & java_awt_event_InputEvent_BUTTON2_DOWN_MASK ) {
HandleRobotButton(kCGMouseButtonCenter, kCGEventOtherMouseUp,
kCGEventOtherMouseDown, kCGEventOtherMouseDragged);
}
// Right
if (buttonsState & java_awt_event_InputEvent_BUTTON3_MASK ||
buttonsState & java_awt_event_InputEvent_BUTTON3_DOWN_MASK ) {
HandleRobotButton(kCGMouseButtonRight, kCGEventRightMouseUp,
kCGEventRightMouseDown, kCGEventRightMouseDragged);
}
// Extra
if (gNumberOfButtons > 3) {
int extraButton;
for (extraButton = 3; extraButton < gNumberOfButtons; ++extraButton) {
if ((buttonsState & gButtonDownMasks[extraButton])) {
HandleRobotButton(extraButton, kCGEventOtherMouseUp,
kCGEventOtherMouseDown, kCGEventOtherMouseDragged);
}
}
}
int clickCount = 0;
int eventNumber = gsEventNumber;
if (isMouseMove) {
// any mouse movement resets click count
gsLastClickTime = 0;
} else {
clickCount = GetClickCount(isButtonsDownState);
if (isButtonsDownState) {
gsButtonEventNumber[button] = gsEventNumber++;
}
eventNumber = gsButtonEventNumber[button];
}
PostMouseEvent(point, button, type, clickCount, eventNumber);
JNF_COCOA_EXIT(env);
}
/*
* Class: sun_lwawt_macosx_CRobot
* Method: mouseWheel
* Signature: (I)V
*/
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_CRobot_mouseWheel
(JNIEnv *env, jobject peer, jint wheelAmt)
{
CGEventRef event = CGEventCreateScrollWheelEvent(NULL,
kCGScrollEventUnitLine,
k_JAVA_ROBOT_WHEEL_COUNT, wheelAmt);
if (event != NULL) {
CGEventPost(kCGSessionEventTap, event);
CFRelease(event);
}
}
/*
* Class: sun_lwawt_macosx_CRobot
* Method: keyEvent
* Signature: (IZ)V
*/
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_CRobot_keyEvent
(JNIEnv *env, jobject peer, jint javaKeyCode, jboolean keyPressed)
{
/*
* Well, using CGEventCreateKeyboardEvent/CGEventPost would have been
* a better solution, however, it gives me all kinds of trouble and I have
* no idea how to solve them without inserting delays between simulated
* events. So, I've ended up disabling it and opted for another approach
* that uses Accessibility API instead.
*/
CGKeyCode keyCode = GetCGKeyCode(javaKeyCode);
AXUIElementRef elem = AXUIElementCreateSystemWide();
AXUIElementPostKeyboardEvent(elem, (CGCharCode)0, keyCode, keyPressed);
CFRelease(elem);
#if 0
CGEventRef event = CGEventCreateKeyboardEvent(NULL, keyCode, keyPressed);
if (event != NULL) {
CGEventPost(kCGSessionEventTap, event);
CFRelease(event);
}
#endif
}
/*
* Class: sun_lwawt_macosx_CRobot
* Method: nativeGetScreenPixels
* Signature: (IIIII[I)V
*/
JNIEXPORT void JNICALL
Java_sun_lwawt_macosx_CRobot_nativeGetScreenPixels
(JNIEnv *env, jobject peer,
jint x, jint y, jint width, jint height, jintArray pixels)
{
JNF_COCOA_ENTER(env);
jint picX = x;
jint picY = y;
jint picWidth = width;
jint picHeight = height;
CGRect screenRect = CGRectMake(picX, picY, picWidth, picHeight);
CGImageRef screenPixelsImage = CGWindowListCreateImage(screenRect,
kCGWindowListOptionOnScreenOnly,
kCGNullWindowID, kCGWindowImageDefault);
if (screenPixelsImage == NULL) {
return;
}
// get a pointer to the Java int array
void *jPixelData = (*env)->GetPrimitiveArrayCritical(env, pixels, 0);
// create a graphics context around the Java int array
CGColorSpaceRef picColorSpace = CGColorSpaceCreateWithName(
kCGColorSpaceGenericRGB);
CGContextRef jPicContextRef = CGBitmapContextCreate(
jPixelData,
picWidth, picHeight,
8, picWidth * sizeof(jint),
picColorSpace,
kCGBitmapByteOrder32Host |
kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease(picColorSpace);
// flip, scale, and color correct the screen image into the Java pixels
CGRect bounds = { { 0, 0 }, { picWidth, picHeight } };
CGContextDrawImage(jPicContextRef, bounds, screenPixelsImage);
CGContextFlush(jPicContextRef);
// cleanup
CGContextRelease(jPicContextRef);
CGImageRelease(screenPixelsImage);
// release the Java int array back up to the JVM
(*env)->ReleasePrimitiveArrayCritical(env, pixels, jPixelData, 0);
JNF_COCOA_EXIT(env);
}
/****************************************************
* Helper methods
****************************************************/
static void PostMouseEvent(const CGPoint point, CGMouseButton button,
CGEventType type, int clickCount, int eventNumber)
{
CGEventRef mouseEvent = CGEventCreateMouseEvent(NULL, type, point, button);
if (mouseEvent != NULL) {
CGEventSetIntegerValueField(mouseEvent, kCGMouseEventClickState, clickCount);
CGEventSetIntegerValueField(mouseEvent, kCGMouseEventNumber, eventNumber);
CGEventPost(kCGSessionEventTap, mouseEvent);
CFRelease(mouseEvent);
}
}
// NOTE: Don't modify this table directly. It is machine generated. See below.
static const unsigned char javaToMacKeyCode[] = {
127, // 0 0 VK_UNDEFINED No_Equivalent
127, // 1 0x1 Not_Used
127, // 2 0x2 Not_Used
127, // 3 0x3 VK_CANCEL No_Equivalent
127, // 4 0x4 Not_Used
127, // 5 0x5 Not_Used
127, // 6 0x6 Not_Used
127, // 7 0x7 Not_Used
51, // 8 0x8 VK_BACK_SPACE
48, // 9 0x9 VK_TAB
36, // 10 0xa VK_ENTER
127, // 11 0xb Not_Used
71, // 12 0xc VK_CLEAR
127, // 13 0xd Not_Used
127, // 14 0xe Not_Used
127, // 15 0xf Not_Used
56, // 16 0x10 VK_SHIFT
59, // 17 0x11 VK_CONTROL
58, // 18 0x12 VK_ALT
113, // 19 0x13 VK_PAUSE
57, // 20 0x14 VK_CAPS_LOCK
127, // 21 0x15 VK_KANA No_Equivalent
127, // 22 0x16 Not_Used
127, // 23 0x17 Not_Used
127, // 24 0x18 VK_FINAL No_Equivalent
127, // 25 0x19 VK_KANJI No_Equivalent
127, // 26 0x1a Not_Used
53, // 27 0x1b VK_ESCAPE
127, // 28 0x1c VK_CONVERT No_Equivalent
127, // 29 0x1d VK_NONCONVERT No_Equivalent
127, // 30 0x1e VK_ACCEPT No_Equivalent
127, // 31 0x1f VK_MODECHANGE No_Equivalent
49, // 32 0x20 VK_SPACE
116, // 33 0x21 VK_PAGE_UP
121, // 34 0x22 VK_PAGE_DOWN
119, // 35 0x23 VK_END
115, // 36 0x24 VK_HOME
123, // 37 0x25 VK_LEFT
126, // 38 0x26 VK_UP
124, // 39 0x27 VK_RIGHT
125, // 40 0x28 VK_DOWN
127, // 41 0x29 Not_Used
127, // 42 0x2a Not_Used
127, // 43 0x2b Not_Used
43, // 44 0x2c VK_COMMA
27, // 45 0x2d VK_MINUS
47, // 46 0x2e VK_PERIOD
44, // 47 0x2f VK_SLASH
29, // 48 0x30 VK_0
18, // 49 0x31 VK_1
19, // 50 0x32 VK_2
20, // 51 0x33 VK_3
21, // 52 0x34 VK_4
23, // 53 0x35 VK_5
22, // 54 0x36 VK_6
26, // 55 0x37 VK_7
28, // 56 0x38 VK_8
25, // 57 0x39 VK_9
127, // 58 0x3a Not_Used
41, // 59 0x3b VK_SEMICOLON
127, // 60 0x3c Not_Used
24, // 61 0x3d VK_EQUALS
127, // 62 0x3e Not_Used
127, // 63 0x3f Not_Used
127, // 64 0x40 Not_Used
0, // 65 0x41 VK_A
11, // 66 0x42 VK_B
8, // 67 0x43 VK_C
2, // 68 0x44 VK_D
14, // 69 0x45 VK_E
3, // 70 0x46 VK_F
5, // 71 0x47 VK_G
4, // 72 0x48 VK_H
34, // 73 0x49 VK_I
38, // 74 0x4a VK_J
40, // 75 0x4b VK_K
37, // 76 0x4c VK_L
46, // 77 0x4d VK_M
45, // 78 0x4e VK_N
31, // 79 0x4f VK_O
35, // 80 0x50 VK_P
12, // 81 0x51 VK_Q
15, // 82 0x52 VK_R
1, // 83 0x53 VK_S
17, // 84 0x54 VK_T
32, // 85 0x55 VK_U
9, // 86 0x56 VK_V
13, // 87 0x57 VK_W
7, // 88 0x58 VK_X
16, // 89 0x59 VK_Y
6, // 90 0x5a VK_Z
33, // 91 0x5b VK_OPEN_BRACKET
42, // 92 0x5c VK_BACK_SLASH
30, // 93 0x5d VK_CLOSE_BRACKET
127, // 94 0x5e Not_Used
127, // 95 0x5f Not_Used
82, // 96 0x60 VK_NUMPAD0
83, // 97 0x61 VK_NUMPAD1
84, // 98 0x62 VK_NUMPAD2
85, // 99 0x63 VK_NUMPAD3
86, // 100 0x64 VK_NUMPAD4
87, // 101 0x65 VK_NUMPAD5
88, // 102 0x66 VK_NUMPAD6
89, // 103 0x67 VK_NUMPAD7
91, // 104 0x68 VK_NUMPAD8
92, // 105 0x69 VK_NUMPAD9
67, // 106 0x6a VK_MULTIPLY
69, // 107 0x6b VK_ADD
127, // 108 0x6c VK_SEPARATER No_Equivalent
78, // 109 0x6d VK_SUBTRACT
65, // 110 0x6e VK_DECIMAL
75, // 111 0x6f VK_DIVIDE
122, // 112 0x70 VK_F1
120, // 113 0x71 VK_F2
99, // 114 0x72 VK_F3
118, // 115 0x73 VK_F4
96, // 116 0x74 VK_F5
97, // 117 0x75 VK_F6
98, // 118 0x76 VK_F7
100, // 119 0x77 VK_F8
101, // 120 0x78 VK_F9
109, // 121 0x79 VK_F10
103, // 122 0x7a VK_F11
111, // 123 0x7b VK_F12
127, // 124 0x7c Not_Used
127, // 125 0x7d Not_Used
127, // 126 0x7e Not_Used
117, // 127 0x7f VK_DELETE
127, // 128 0x80 VK_DEAD_GRAVE No_Equivalent
127, // 129 0x81 VK_DEAD_ACUTE No_Equivalent
127, // 130 0x82 VK_DEAD_CIRCUMFLEX No_Equivalent
127, // 131 0x83 VK_DEAD_TILDE No_Equivalent
127, // 132 0x84 VK_DEAD_MACRON No_Equivalent
127, // 133 0x85 VK_DEAD_BREVE No_Equivalent
127, // 134 0x86 VK_DEAD_ABOVEDOT No_Equivalent
127, // 135 0x87 VK_DEAD_DIAERESIS No_Equivalent
127, // 136 0x88 VK_DEAD_ABOVERING No_Equivalent
127, // 137 0x89 VK_DEAD_DOUBLEACUTE No_Equivalent
127, // 138 0x8a VK_DEAD_CARON No_Equivalent
127, // 139 0x8b VK_DEAD_CEDILLA No_Equivalent
127, // 140 0x8c VK_DEAD_OGONEK No_Equivalent
127, // 141 0x8d VK_DEAD_IOTA No_Equivalent
127, // 142 0x8e VK_DEAD_VOICED_SOUND No_Equivalent
127, // 143 0x8f VK_DEAD_SEMIVOICED_SOUND No_Equivalent
127, // 144 0x90 VK_NUM_LOCK No_Equivalent
107, // 145 0x91 VK_SCROLL_LOCK
127, // 146 0x92 Not_Used
127, // 147 0x93 Not_Used
127, // 148 0x94 Not_Used
127, // 149 0x95 Not_Used
127, // 150 0x96 VK_AMPERSAND No_Equivalent
127, // 151 0x97 VK_ASTERISK No_Equivalent
127, // 152 0x98 VK_QUOTEDBL No_Equivalent
127, // 153 0x99 VK_LESS No_Equivalent
105, // 154 0x9a VK_PRINTSCREEN
127, // 155 0x9b VK_INSERT No_Equivalent
114, // 156 0x9c VK_HELP
55, // 157 0x9d VK_META
127, // 158 0x9e Not_Used
127, // 159 0x9f Not_Used
127, // 160 0xa0 VK_GREATER No_Equivalent
127, // 161 0xa1 VK_BRACELEFT No_Equivalent
127, // 162 0xa2 VK_BRACERIGHT No_Equivalent
127, // 163 0xa3 Not_Used
127, // 164 0xa4 Not_Used
127, // 165 0xa5 Not_Used
127, // 166 0xa6 Not_Used
127, // 167 0xa7 Not_Used
127, // 168 0xa8 Not_Used
127, // 169 0xa9 Not_Used
127, // 170 0xaa Not_Used
127, // 171 0xab Not_Used
127, // 172 0xac Not_Used
127, // 173 0xad Not_Used
127, // 174 0xae Not_Used
127, // 175 0xaf Not_Used
127, // 176 0xb0 Not_Used
127, // 177 0xb1 Not_Used
127, // 178 0xb2 Not_Used
127, // 179 0xb3 Not_Used
127, // 180 0xb4 Not_Used
127, // 181 0xb5 Not_Used
127, // 182 0xb6 Not_Used
127, // 183 0xb7 Not_Used
127, // 184 0xb8 Not_Used
127, // 185 0xb9 Not_Used
127, // 186 0xba Not_Used
127, // 187 0xbb Not_Used
127, // 188 0xbc Not_Used
127, // 189 0xbd Not_Used
127, // 190 0xbe Not_Used
127, // 191 0xbf Not_Used
50, // 192 0xc0 VK_BACK_QUOTE
127, // 193 0xc1 Not_Used
127, // 194 0xc2 Not_Used
127, // 195 0xc3 Not_Used
127, // 196 0xc4 Not_Used
127, // 197 0xc5 Not_Used
127, // 198 0xc6 Not_Used
127, // 199 0xc7 Not_Used
127, // 200 0xc8 Not_Used
127, // 201 0xc9 Not_Used
127, // 202 0xca Not_Used
127, // 203 0xcb Not_Used
127, // 204 0xcc Not_Used
127, // 205 0xcd Not_Used
127, // 206 0xce Not_Used
127, // 207 0xcf Not_Used
127, // 208 0xd0 Not_Used
127, // 209 0xd1 Not_Used
127, // 210 0xd2 Not_Used
127, // 211 0xd3 Not_Used
127, // 212 0xd4 Not_Used
127, // 213 0xd5 Not_Used
127, // 214 0xd6 Not_Used
127, // 215 0xd7 Not_Used
127, // 216 0xd8 Not_Used
127, // 217 0xd9 Not_Used
127, // 218 0xda Not_Used
127, // 219 0xdb Not_Used
127, // 220 0xdc Not_Used
127, // 221 0xdd Not_Used
39 // 222 0xde VK_QUOTE
};
// NOTE: All values above 222 don't have an equivalent on MacOSX.
static inline CGKeyCode GetCGKeyCode(jint javaKeyCode)
{
if (javaKeyCode > 222) {
return 127;
} else {
return javaToMacKeyCode[javaKeyCode];
}
}
static int GetClickCount(BOOL isDown) {
NSTimeInterval now = [[NSDate date] timeIntervalSinceReferenceDate];
NSTimeInterval clickInterval = now - gsLastClickTime;
BOOL isWithinTreshold = clickInterval < [NSEvent doubleClickInterval];
if (isDown) {
if (isWithinTreshold) {
gsClickCount++;
} else {
gsClickCount = 1;
}
gsLastClickTime = now;
} else {
// In OS X, a mouse up has the click count of the last mouse down
// if an interval between up and down is within the double click
// threshold, and 0 otherwise.
if (!isWithinTreshold) {
gsClickCount = 0;
}
}
return gsClickCount;
}
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