https://www.dietitian.gr/gistfile1.js

1/**
2* author Remy Sharp
3* url http://remysharp.com/tag/marquee
4*/
5
6(function ($) {
7    $.fn.marquee = function (klass) {
8        var newMarquee = [],
9            last = this.length;
10
11        // works out the left or right hand reset position, based on scroll
12        // behavior, current direction and new direction
13        function getReset(newDir, marqueeRedux, marqueeState) {
14            var behavior = marqueeState.behavior, width = marqueeState.width, dir = marqueeState.dir;
15            var r = 0;
16            if (behavior == 'alternate') {
17                r = newDir == 1 ? marqueeRedux[marqueeState.widthAxis] - (width*2) : width;
18            } else if (behavior == 'slide') {
19                if (newDir == -1) {
20                    r = dir == -1 ? marqueeRedux[marqueeState.widthAxis] : width;
21                } else {
22                    r = dir == -1 ? marqueeRedux[marqueeState.widthAxis] - (width*2) : 0;
23                }
24            } else {
25                r = newDir == -1 ? marqueeRedux[marqueeState.widthAxis] : 0;
26            }
27            return r;
28        }
29
30        // single "thread" animation
31        function animateMarquee() {
32            var i = newMarquee.length,
33                marqueeRedux = null,
34                $marqueeRedux = null,
35                marqueeState = {},
36                newMarqueeList = [],
37                hitedge = false;
38                
39            while (i--) {
40                marqueeRedux = newMarquee[i];
41                $marqueeRedux = $(marqueeRedux);
42                marqueeState = $marqueeRedux.data('marqueeState');
43                
44                if ($marqueeRedux.data('paused') !== true) {
45                    // TODO read scrollamount, dir, behavior, loops and last from data
46                    marqueeRedux[marqueeState.axis] += (marqueeState.scrollamount * marqueeState.dir);
47
48                    // only true if it's hit the end
49                    hitedge = marqueeState.dir == -1 ? marqueeRedux[marqueeState.axis] <= getReset(marqueeState.dir * -1, marqueeRedux, marqueeState) : marqueeRedux[marqueeState.axis] >= getReset(marqueeState.dir * -1, marqueeRedux, marqueeState);
50                    
51                    if ((marqueeState.behavior == 'scroll' && marqueeState.last == marqueeRedux[marqueeState.axis]) || (marqueeState.behavior == 'alternate' && hitedge && marqueeState.last != -1) || (marqueeState.behavior == 'slide' && hitedge && marqueeState.last != -1)) {                        
52                        if (marqueeState.behavior == 'alternate') {
53                            marqueeState.dir *= -1; // flip
54                        }
55                        marqueeState.last = -1;
56
57                        $marqueeRedux.trigger('stop');
58
59                        marqueeState.loops--;
60                        if (marqueeState.loops === 0) {
61                            if (marqueeState.behavior != 'slide') {
62                                marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
63                            } else {
64                                // corrects the position
65                                marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir * -1, marqueeRedux, marqueeState);
66                            }
67
68                            $marqueeRedux.trigger('end');
69                        } else {
70                            // keep this marquee going
71                            newMarqueeList.push(marqueeRedux);
72                            $marqueeRedux.trigger('start');
73                            marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
74                        }
75                    } else {
76                        newMarqueeList.push(marqueeRedux);
77                    }
78                    marqueeState.last = marqueeRedux[marqueeState.axis];
79
80                    // store updated state only if we ran an animation
81                    $marqueeRedux.data('marqueeState', marqueeState);
82                } else {
83                    // even though it's paused, keep it in the list
84                    newMarqueeList.push(marqueeRedux);                    
85                }
86            }
87
88            newMarquee = newMarqueeList;
89            
90            if (newMarquee.length) {
91                setTimeout(animateMarquee, 25);
92            }            
93        }
94        
95        // TODO consider whether using .html() in the wrapping process could lead to loosing predefined events...
96        this.each(function (i) {
97            var $marquee = $(this),
98                width = $marquee.attr('width') || $marquee.width(),
99                height = $marquee.attr('height') || $marquee.height(),
100                $marqueeRedux = $marquee.after('<div ' + (klass ? 'class="' + klass + '" ' : '') + 'style="display: block-inline; width: ' + width + 'px; height: ' + height + 'px; overflow: hidden;"><div style="float: left; white-space: nowrap;">' + $marquee.html() + '</div></div>').next(),
101                marqueeRedux = $marqueeRedux.get(0),
102                hitedge = 0,
103                direction = ($marquee.attr('direction') || 'left').toLowerCase(),
104                marqueeState = {
105                    dir : /down|right/.test(direction) ? -1 : 1,
106                    axis : /left|right/.test(direction) ? 'scrollLeft' : 'scrollTop',
107                    widthAxis : /left|right/.test(direction) ? 'scrollWidth' : 'scrollHeight',
108                    last : -1,
109                    loops : $marquee.attr('loop') || -1,
110                    scrollamount : $marquee.attr('scrollamount') || this.scrollAmount || 2,
111                    behavior : ($marquee.attr('behavior') || 'scroll').toLowerCase(),
112                    width : /left|right/.test(direction) ? width : height
113                };
114            
115            // corrects a bug in Firefox - the default loops for slide is -1
116            if ($marquee.attr('loop') == -1 && marqueeState.behavior == 'slide') {
117                marqueeState.loops = 1;
118            }
119
120            $marquee.remove();
121            
122            // add padding
123            if (/left|right/.test(direction)) {
124                $marqueeRedux.find('> div').css('padding', '0 ' + width + 'px');
125            } else {
126                $marqueeRedux.find('> div').css('padding', height + 'px 0');
127            }
128            
129            // events
130            $marqueeRedux.bind('stop', function () {
131                $marqueeRedux.data('paused', true);
132            }).bind('pause', function () {
133                $marqueeRedux.data('paused', true);
134            }).bind('start', function () {
135                $marqueeRedux.data('paused', false);
136            }).bind('unpause', function () {
137                $marqueeRedux.data('paused', false);
138            }).data('marqueeState', marqueeState); // finally: store the state
139            
140            // todo - rerender event allowing us to do an ajax hit and redraw the marquee
141
142            newMarquee.push(marqueeRedux);
143
144            marqueeRedux[marqueeState.axis] = getReset(marqueeState.dir, marqueeRedux, marqueeState);
145            $marqueeRedux.trigger('start');
146            
147            // on the very last marquee, trigger the animation
148            if (i+1 == last) {
149                animateMarquee();
150            }
151        });            
152
153        return $(newMarquee);
154    };
155}(jQuery));