https://fawziakoofi.org/wp-content/plugins/wp-photo-album-plus/js/wppa-touch.js?ver=260930-65941

1// wppa-touch.js
2//
3// Contains swipe modules
4// Dependancies: wppa.js and default wp jQuery library
5//
6var wppaJsTouchVersion = '8.5.01.008';
7
8function wppaStartTime() {
9	var d = new Date();
10	var t = d.getTime();
11	wppaMobileTimeStart = t;
12	return true;
13}
14
15function wppaInTime() {
16	var d = new Date();
17	var t = d.getTime();
18	// Return true if no later than 500 msec after wppaStartTime();
19	return ( t - wppaMobileTimeStart ) < 250;
20}
21
22function wppaTapLink( id, url ) {
23	if ( wppaInTime() ) {
24		_bumpClickCount( id );
25		document.location.href = url;
26	}
27}
28
29function wppaTouchStart( event, id, mocc ) {
30
31	wppaSwipeMocc = mocc;
32
33	if ( mocc == -1 ) {
34		wppaSwipeOnLightbox = true;
35		event.preventDefault();
36	}
37
38	wppaFingerCount = event.touches.length;
39
40	if ( wppaFingerCount == 1 ) {
41		wppaStartX = event.touches[0].pageX;
42		wppaStartY = event.touches[0].pageY;
43		wppaTriggerElementID = id;
44	} else {
45		wppaTouchCancel();
46	}
47}
48
49function wppaTouchMove( event ) {
50
51	if ( wppaSwipeOnLightbox ) {
52		event.preventDefault();
53	}
54
55	if ( event.touches.length == 1 ) {
56		wppaCurX = event.touches[0].pageX;
57		wppaCurY = event.touches[0].pageY;
58	} else {
59		wppaTouchCancel();
60	}
61}
62
63function wppaTouchEnd( event ) {
64
65	if ( wppaSwipeOnLightbox ) {
66		event.preventDefault();
67	}
68
69	if ( wppaFingerCount == 1 && wppaCurX != 0 ) {
70		wppaSwipeLength = Math.round( Math.sqrt( Math.pow( wppaCurX - wppaStartX,2 ) + Math.pow( wppaCurY - wppaStartY,2 ) ) );
71		if ( wppaSwipeLength >= wppaMinLength ) {
72			wppaCalculateAngle();
73			wppaDetermineSwipeDirection();
74			wppaProcessingRoutine();
75		}
76	}
77	wppaTouchCancel();
78}
79
80function wppaTouchCancel() {
81	wppaFingerCount 		= 0;
82	wppaStartX 				= 0;
83	wppaStartY 				= 0;
84	wppaCurX 				= 0;
85	wppaCurY 				= 0;
86	wppaDeltaX 				= 0;
87	wppaDeltaY 				= 0;
88	wppaHorzDiff 			= 0;
89	wppaVertDiff 			= 0;
90	wppaSwipeLength 		= 0;
91	wppaSwipeAngle 			= null;
92	wppaSwipeDirection 		= null;
93	wppaTriggerElementID 	= null;
94	wppaSwipeOnLightbox 	= false;
95	wppaSwipeMocc 			= 0;
96}
97
98function wppaCalculateAngle() {
99
100	var X = wppaStartX-wppaCurX;
101	var Y = wppaCurY-wppaStartY;
102	var Z = Math.round( Math.sqrt( Math.pow( X,2 )+Math.pow( Y,2 ) ) ); //the distance - rounded - in pixels
103	var r = Math.atan2( Y,X ); //angle in radians ( Cartesian system )
104
105	wppaSwipeAngle = Math.round( r*180/Math.PI ); //angle in degrees
106
107	if ( wppaSwipeAngle < 0 ) {
108		wppaSwipeAngle =  360 - Math.abs( wppaSwipeAngle );
109	}
110}
111
112function wppaDetermineSwipeDirection() {
113
114	if ( ( wppaSwipeAngle <= 45 ) && ( wppaSwipeAngle >= 0 ) ) {
115		wppaSwipeDirection = 'left';
116	}
117	else if ( ( wppaSwipeAngle <= 360 ) && ( wppaSwipeAngle >= 315 ) ) {
118		wppaSwipeDirection = 'left';
119	}
120	else if ( ( wppaSwipeAngle >= 135 ) && ( wppaSwipeAngle <= 225 ) ) {
121		wppaSwipeDirection = 'right';
122	}
123	else if ( ( wppaSwipeAngle > 45 ) && ( wppaSwipeAngle < 135 ) ) {
124		wppaSwipeDirection = 'down';
125	}
126	else {
127		wppaSwipeDirection = 'up';
128	}
129}
130
131function wppaProcessingRoutine() {
132
133	var swipedElement = document.getElementById( wppaTriggerElementID );
134
135	// swipe on ligtbox image
136	if ( wppaSwipeOnLightbox ) {
137		if ( wppaSwipeDirection == 'left' ) {
138			wppaOvlShowNext();
139		}
140		else if ( wppaSwipeDirection == 'right' ) {
141			wppaOvlShowPrev();
142		}
143	}
144
145	// swipe on slideshow
146	else {
147		if ( wppaSwipeDirection == 'right' ) {
148			idx = _wppaCurIdx[wppaSwipeMocc] - 1;
149			if ( idx < 0 ) {
150				if ( ! wppaSlideWrap ) {
151					return;
152				}
153				idx = _wppaSlides[wppaSwipeMocc].length - 1;
154			}
155			wppaGotoKeepState( wppaSwipeMocc , idx );
156		}
157		if ( wppaSwipeDirection == 'left' ) {
158			idx = _wppaCurIdx[wppaSwipeMocc] + 1;
159			if ( idx == _wppaSlides[wppaSwipeMocc].length ) {
160				if ( ! wppaSlideWrap ) {
161					return;
162				}
163				idx = 0;
164			}
165			wppaGotoKeepState( wppaSwipeMocc , idx );
166		}
167		else if ( wppaSwipeDirection == 'up' ) {
168		}
169		else if ( wppaSwipeDirection == 'down' ) {
170		}
171	}
172
173	wppaTouchCancel();	// Reset
174}