oxjs/source/Ox.UI/js/Video/Ox.VideoPreview.js

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'use strict';
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/*@
Ox.VideoPreview <function> Video Preview
(options[, self]) -> <o> Video Preview
options <o> Options
self <o> Shared private variable
@*/
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Ox.VideoPreview = function(options, self) {
self = self || {};
var that = Ox.Element({}, self)
.defaults({
duration: 0,
getFrame: null,
fps: 25,
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frameRatio: 16/9,
height: 256,
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position: void 0,
scaleToFill: false,
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timeline: '',
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width: 256
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})
.options(options || {})
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.addClass('OxVideoPreview')
.css({
width: self.options.width + 'px',
height: self.options.height + 'px'
});
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self.loaded = [];
self.queue = [];
self.$frameElement = $('<div>')
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.addClass('OxFrame')
.appendTo(that.$element)
self.$frame = $('<img>')
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.attr({src: self.options.getFrame(self.options.position)})
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.css(getFrameCSS())
.appendTo(self.$frameElement);
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self.$timeline = $('<img>')
.addClass('OxTimeline')
.attr({src: self.options.timeline})
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.css({width: self.options.width + 'px'})
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.appendTo(that.$element);
self.$interface = Ox.Element({
tooltip: function(event) {
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// e.offsetX does not work in Firefox
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var position = getPosition(event.clientX - that.offset().left);
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self.$frame.attr({src: getClosestFrame(position)});
self.timeout && clearTimeout(self.timeout);
self.timeout = setTimeout(function() {
self.$frame.attr({src: self.options.getFrame(position)});
}, 250);
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return Ox.formatDuration(position, 2);
}
})
.addClass('OxInterface')
.bind({
click: click,
mouseenter: startLoading,
mouseleave: function() {
stopLoading();
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self.$frame.attr({src: self.options.getFrame(self.options.position)});
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}
})
.appendTo(that.$element);
function click(e) {
that.triggerEvent('click', {
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// e.offsetX does not work in Firefox
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position: getPosition(e.clientX - that.offset().left)
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});
}
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function getClosestFrame(position) {
return self.loaded.length == 0
? self.options.getFrame(self.options.position)
: self.loaded.sort(function(a, b) {
return Math.abs(a.position - position) - Math.abs(b.position - position);
})[0].frame;
}
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function getFrameCSS() {
var css = {},
elementWidth = self.options.width,
elementHeight = self.options.height - 16,
elementRatio = elementWidth / elementHeight,
frameRatio = self.options.frameRatio,
frameIsWider = frameRatio > elementRatio;
if (self.options.scaleToFill) {
css.width = frameIsWider ? elementHeight * frameRatio : elementWidth;
css.height = frameIsWider ? elementHeight : elementWidth / frameRatio;
css.marginLeft = frameIsWider ? (elementWidth - css.width) / 2 : 0;
css.marginTop = frameIsWider ? 0 : (elementHeight - css.height) / 2;
} else {
css.width = frameIsWider ? elementWidth : elementHeight * frameRatio;
css.height = frameIsWider ? elementWidth / frameRatio : elementHeight;
css.marginLeft = frameIsWider ? 0 : (css.width - elementWidth) / 2;
css.marginTop = frameIsWider ? (css.height - elementHeight) / 2 : 0;
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}
return Ox.map(css, function(value) {
return Math.round(value) + 'px';
});
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}
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function getPosition(x) {
return Math.round(
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self.options.duration * x / self.options.width * self.options.fps
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) / self.options.fps;
}
function startLoading() {
var last,
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steps = [Math.round(self.options.width / 2)];
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while ((last = steps[steps.length - 1]) > 1) {
steps.push(Math.round(last / 2));
}
steps.forEach(function(step) {
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Ox.loop(0, self.options.width, step, function(x) {
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var position = getPosition(x),
frame = self.options.getFrame(position);
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if (!self.loaded.some(function(image) {
return image.frame == frame;
}) && !self.queue.some(function(image) {
return image.frame == frame;
})) {
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self.queue.push({frame: frame, position: position});
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}
});
});
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self.queue.length && loadFrame();
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function loadFrame() {
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var image = self.queue.shift();
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$('<img>')
.load(function() {
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self.loaded.push(image);
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self.queue.length && loadFrame();
})
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.attr({src: image.frame})
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}
}
function stopLoading() {
self.queue = [];
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self.timeout && clearTimeout(self.timeout);
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}
self.setOption = function(key, value) {
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if (key == 'height') {
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that.css({height: value + 'px'});
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self.$frame.css(getFrameCSS());
} else if (key == 'position') {
self.$frame.attr({src: self.options.getFrame(value)});
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} else if (key == 'width') {
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that.css({width: value + 'px'});
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stopLoading();
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self.$frame.attr({src: self.options.getFrame()})
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.css(getFrameCSS());
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self.$timeline.css({width: value + 'px'});
}
}
return that;
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};