https://www.sansa.org.za/wp-content/plugins/gardon-addon/assets/ve…/twentytwenty.js?ver=1689101352

1(function($){
2
3  $.fn.twentytwenty = function(options) {
4    var options = $.extend({
5      default_offset_pct: 0.5,
6      orientation: 'horizontal',
7      before_label: 'Before',
8      after_label: 'After',
9      no_overlay: false,
10      move_slider_on_hover: false,
11      move_with_handle_only: true,
12      click_to_move: false
13    }, options);
14
15    return this.each(function() {
16
17      var sliderPct = options.default_offset_pct;
18      var container = $(this);
19      var sliderOrientation = options.orientation;
20      var beforeDirection = (sliderOrientation === 'vertical') ? 'down' : 'left';
21      var afterDirection = (sliderOrientation === 'vertical') ? 'up' : 'right';
22
23
24      container.wrap("<div class='twentytwenty-wrapper twentytwenty-" + sliderOrientation + "'></div>");
25      if(!options.no_overlay) {
26        container.append("<div class='twentytwenty-overlay'></div>");
27        var overlay = container.find(".twentytwenty-overlay");
28        overlay.append("<div class='twentytwenty-before-label' data-content='"+options.before_label+"'></div>");
29        overlay.append("<div class='twentytwenty-after-label' data-content='"+options.after_label+"'></div>");
30      }
31      var beforeImg = container.find("img:first");
32      var afterImg = container.find("img:last");
33      container.append("<div class='twentytwenty-handle'></div>");
34      var slider = container.find(".twentytwenty-handle");
35      slider.append("<span class='twentytwenty-" + beforeDirection + "-arrow'></span>");
36      slider.append("<span class='twentytwenty-" + afterDirection + "-arrow'></span>");
37      container.addClass("twentytwenty-container");
38      beforeImg.addClass("twentytwenty-before");
39      afterImg.addClass("twentytwenty-after");
40      
41      var calcOffset = function(dimensionPct) {
42        var w = beforeImg.width();
43        var h = beforeImg.height();
44        return {
45          w: w+"px",
46          h: h+"px",
47          cw: (dimensionPct*w)+"px",
48          ch: (dimensionPct*h)+"px"
49        };
50      };
51
52      var adjustContainer = function(offset) {
53      	if (sliderOrientation === 'vertical') {
54          beforeImg.css("clip", "rect(0,"+offset.w+","+offset.ch+",0)");
55          afterImg.css("clip", "rect("+offset.ch+","+offset.w+","+offset.h+",0)");
56      	}
57      	else {
58          beforeImg.css("clip", "rect(0,"+offset.cw+","+offset.h+",0)");
59          afterImg.css("clip", "rect(0,"+offset.w+","+offset.h+","+offset.cw+")");
60    	}
61        container.css("height", offset.h);
62      };
63
64      var adjustSlider = function(pct) {
65        var offset = calcOffset(pct);
66        slider.css((sliderOrientation==="vertical") ? "top" : "left", (sliderOrientation==="vertical") ? offset.ch : offset.cw);
67        adjustContainer(offset);
68      };
69
70      // Return the number specified or the min/max number if it outside the range given.
71      var minMaxNumber = function(num, min, max) {
72        return Math.max(min, Math.min(max, num));
73      };
74
75      // Calculate the slider percentage based on the position.
76      var getSliderPercentage = function(positionX, positionY) {
77        var sliderPercentage = (sliderOrientation === 'vertical') ?
78          (positionY-offsetY)/imgHeight :
79          (positionX-offsetX)/imgWidth;
80
81        return minMaxNumber(sliderPercentage, 0, 1);
82      };
83
84
85      $(window).on("resize.twentytwenty", function(e) {
86        adjustSlider(sliderPct);
87      });
88
89      var offsetX = 0;
90      var offsetY = 0;
91      var imgWidth = 0;
92      var imgHeight = 0;
93      var onMoveStart = function(e) {
94        if (((e.distX > e.distY && e.distX < -e.distY) || (e.distX < e.distY && e.distX > -e.distY)) && sliderOrientation !== 'vertical') {
95          e.preventDefault();
96        }
97        else if (((e.distX < e.distY && e.distX < -e.distY) || (e.distX > e.distY && e.distX > -e.distY)) && sliderOrientation === 'vertical') {
98          e.preventDefault();
99        }
100        container.addClass("active");
101        offsetX = container.offset().left;
102        offsetY = container.offset().top;
103        imgWidth = beforeImg.width(); 
104        imgHeight = beforeImg.height();          
105      };
106      var onMove = function(e) {
107        if (container.hasClass("active")) {
108          sliderPct = getSliderPercentage(e.pageX, e.pageY);
109          adjustSlider(sliderPct);
110        }
111      };
112      var onMoveEnd = function() {
113          container.removeClass("active");
114      };
115
116      var moveTarget = options.move_with_handle_only ? slider : container;
117      moveTarget.on("movestart",onMoveStart);
118      moveTarget.on("move",onMove);
119      moveTarget.on("moveend",onMoveEnd);
120
121      if (options.move_slider_on_hover) {
122        container.on("mouseenter", onMoveStart);
123        container.on("mousemove", onMove);
124        container.on("mouseleave", onMoveEnd);
125      }
126
127      slider.on("touchmove", function(e) {
128        e.preventDefault();
129      });
130
131      container.find("img").on("mousedown", function(event) {
132        event.preventDefault();
133      });
134
135      if (options.click_to_move) {
136        container.on('click', function(e) {
137          offsetX = container.offset().left;
138          offsetY = container.offset().top;
139          imgWidth = beforeImg.width();
140          imgHeight = beforeImg.height();
141
142          sliderPct = getSliderPercentage(e.pageX, e.pageY);
143          adjustSlider(sliderPct);
144        });
145      }
146
147      $(window).trigger("resize.twentytwenty");
148    });

149  };
150
151})(jQuery);