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imageview.js
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imageview.js
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/**
* Moui
* OO-based UI behavior modules behind CardKit(mobile webapp framework)'s view components
*
* using AMD (Asynchronous Module Definition) API with OzJS
* see http://ozjs.org for details
*
* Copyright (C) 2010-2013, Dexter.Yy, MIT License
* vim: et:ts=4:sw=4:sts=4
*/
define('moui/imageview', [
'dollar',
'mo/lang',
'mo/template/string',
'moui/util/supports',
'moui/util/mousewheel',
'moui/overlay'
], function($, _, tpl, supports, mousewheel, overlay) {
var NS = 'mouiImageView',
BLANK_IMG = 'data:image/gif;base64,R0lGODlhAQABAJH/AP///wAAAMDAwAAAACH5BAEAAAIALAAAAAABAAEAAAICVAEAOw==',
TPL_IMG = '<img src="' + BLANK_IMG + '"><div class="mask"></div>',
TPL_VIEW =
'<div id="{{id}}" class="{{cname}}">\
<div class="shd"></div>\
<div class="wrapper">\
<header>\
<span class="btn cancel"></span>\
<span class="group resize">\
<span class="btn bigger"></span>\
<span class="btn reset"></span>\
<span class="btn smaller"></span>\
<span class="scale-status"></span>\
</span>\
<span class="group pager">\
<span class="btn prev"></span>\
<span class="btn next"></span>\
</span>\
<h1></h1>\
</header>\
<article>' + TPL_IMG + '</article>\
<div class="loading"></div>\
<footer></footer>\
</div>\
</div>',
_piclib = {},
_img_loader_tm,
_scale_timer,
default_config = {
className: 'moui-imageview',
closeDelay: 400,
images: [],
offset: 0,
maxScale: 3,
minScale: 0.5,
scaleStep: 0.05,
initialScroll: 'topleft',
allowDrag: true,
allowWheel: true,
allowSave: true,
loadingContent: 'Loading...',
cancelText: 'x',
smallerText: '—',
resetText: '1x',
biggerText: '+',
nextText: '›',
prevText: '‹'
};
var ImageView = _.construct(overlay.Overlay, function(){
this.superConstructor.apply(this, arguments);
if (supports.touch) {
this._node.addClass('enable-touch');
this.initGesture();
} else {
this.initMousewheel();
this.initDrag();
}
});
_.mix(ImageView.prototype, {
_ns: NS,
_template: TPL_VIEW,
_defaults: _.mix({}, ImageView.prototype._defaults, default_config),
init: function(opt) {
this.superMethod('init', [opt]);
this._wrapper = this._node.find('.wrapper').eq(0);
this._content = this._node.find('footer').eq(-1);
this._imageWrapper = this._node.find('article').eq(0);
this._imageMask = this._imageWrapper.find('.mask');
this._image = this._imageWrapper.find('img');
this._loading = this._node.find('.loading').eq(0);
this._scaleStatus = this._header.find('.scale-status').eq(0);
return this;
},
initGesture: function(){
var self = this,
tm = +new Date(),
last = false;
this._imageWrapper.on('gesturechange', function(e){
clearTimeout(_scale_timer);
e = e.originalEvent || e;
var now = +new Date();
if (now - tm < 50) {
return;
}
tm = now;
if (last !== false) {
self.zoomImage(e.scale - last > 0 && 2 || -2);
}
last = e.scale;
});
},
initMousewheel: function(){
var self = this;
this.event.on('open', function(){
if (self._config.allowWheel) {
mousewheel(self._imageWrapper[0]).on(when_wheel);
}
}).on('close', function(){
if (self._config.allowWheel) {
mousewheel(self._imageWrapper[0]).off(when_wheel);
}
});
function when_wheel(e){
e.preventDefault();
var data = mousewheel.fix(e);
self.zoomImage(data[2] || data[0] > 0 && 2 || -2);
}
},
initDrag: function(){
var x, y,
self = this,
handler = self._config.allowSave
? self._image
: self._imageMask,
box = self._imageWrapper[0];
handler.on('mousedown', function(e){
var which = e.button;
if (!self._config.allowDrag
|| which > 0 && which !== 1
|| which < 0 && which !== -1) {
return;
}
e.preventDefault();
x = e.clientX;
y = e.clientY;
var start_x = x,
start_y = y;
$(document).off('mousemove', when_drag)
.on('mousemove', when_drag)
.once('mouseup', function(e){
if (Math.abs(e.clientX - start_x) > 10
|| Math.abs(e.clientY - start_y) > 10) {
self.event.fire('dragend', [e]);
}
$(document).off('mousemove', when_drag);
});
function when_drag(e){
e.preventDefault();
box.scrollLeft -= e.clientX - x;
box.scrollTop -= e.clientY - y;
x = e.clientX;
y = e.clientY;
}
});
},
set: function(opt) {
if (!opt) {
return this;
}
this.superMethod('set', [opt]);
if (opt.allowSave !== undefined) {
if (opt.allowSave) {
this._node.removeClass('disable-save');
} else {
this._node.addClass('disable-save');
}
}
if (opt.content !== undefined) {
if (!opt.content) {
this._content.hide();
} else {
this._content.show();
}
}
if (opt.loadingContent) {
this._loading.html(opt.loadingContent);
}
_.each(opt, function(str, prop){
var name = /^(\w+)Text$/.exec(prop);
if (name && name[1]) {
this._header.find('.btn.' + name[1]).html(str);
}
}, this);
return this;
},
next: function(){
this.setImage(this._imagesOffset + 1);
},
prev: function(){
this.setImage(this._imagesOffset - 1);
},
startFocus: function(){
this._node.addClass('focus-image');
},
stopFocus: function(){
this._node.removeClass('focus-image');
},
toggleFocus: function(){
this._node.toggleClass('focus-image');
},
dragReset: function(w, h){
var x = 0,
y = 0;
if (this._config.initialScroll === 'center') {
var max_scale = this._config.maxScale;
w = w || this._wrapper.width();
h = h || this._wrapper.height();
x = (w * max_scale - w) / 2;
y = (h * max_scale - h) / 2;
}
this._imageWrapper[0].scrollLeft = x;
this._imageWrapper[0].scrollTop = y;
},
zoomIn: function(n){
this.zoomImage((n || 1) * 2.5);
},
zoomOut: function(n){
this.zoomImage(-(n || 1) * 2.5);
},
zoomReset: function(){
this._lastScale = this._imageScale;
this._changeImageScale(1);
},
zoomToggle: function(){
if (this._imageScale !== 1) {
this.zoomReset();
} else if (this._lastScale) {
this.zoomImageTo(this._lastScale);
}
},
zoomImage: function(delta){
this.zoomImageTo(this._imageScale
+ delta * this._config.scaleStep);
},
zoomImageTo: function(scale){
var max_scale = this._config.maxScale,
min_scale = this._config.minScale,
w = this._imageWidth,
h = this._imageHeight,
r = w / h;
w = scale * w;
if (w < this._imageWidth * min_scale
|| w > this._wrapperWidth * max_scale) {
return;
}
h = w / r;
if (h < this._imageHeight * min_scale
|| h > this._wrapperHeight * max_scale) {
return;
}
this._changeImageScale(w / this._imageWidth);
},
_changeImageScale: function(scale, opt){
opt = opt || {};
var wrapper = this._imageWrapper[0],
w = scale * this._imageWidth,
h = w / (this._imageWidth / this._imageHeight),
l = (this._wrapperWidth - w) / 2,
t = (this._wrapperHeight - h) / 2;
this._imageScale = scale;
this._scaleStatus.html(Math.round(scale * 100) + '%');
if (opt.autoTop
/* || supports.touch*/) {
if (l < 0) {
l = 0;
}
if (t < 0) {
t = 0;
}
}
var values = {
width: w,
left: l,
top: t
};
if (!opt.autoTop
/* && !supports.touch*/) {
if (l < 0) {
values.left = l + wrapper.scrollLeft;
}
if (t < 0) {
values.top = t + wrapper.scrollTop;
}
}
this._image.css(values);
this._imageMask.css(_.mix({
height: h
}, values));
if (opt.autoTop
/* || supports.touch*/) {
return;
}
clearTimeout(_scale_timer);
_scale_timer = setTimeout(function(){
this._image.addClass('disable-effect');
if (l < 0) {
this._image.css('left', 0);
this._imageMask.css('left', 0);
wrapper.scrollLeft = -l;
} else {
wrapper.scrollLeft = 0;
}
if (t < 0) {
this._image.css('top', 0);
this._imageMask.css('top', 0);
wrapper.scrollTop = -t;
} else {
wrapper.scrollTop = 0;
}
this._image.removeClass('disable-effect');
}.bind(this), 500);
},
updateImageSize: function(w, h){
w = w || this._image[0].width;
h = h || this._image[0].height;
if (!w || !h
|| w <= 0 || h <= 0) {
return false;
}
var win_w = this._wrapper.width(),
win_h = this._wrapper.height(),
size = adapted_size(w, h, win_w, win_h);
this._imageWidth = size[0];
this._imageHeight = size[1];
this._wrapperWidth = win_w;
this._wrapperHeight = win_h;
this._changeImageScale(1, {
autoTop: true
});
this.dragReset(win_w, win_h);
return true;
},
setImage: function(offset){
var self = this,
images = this._config.images,
url = images[offset];
if (!url) {
return;
}
var scale_cache = this._imageScale;
this._image.attr('src', BLANK_IMG);
this._loading.show();
this._imagesOffset = offset;
if (offset <= 0) {
this._header.find('.prev').addClass('disabled');
} else {
this._header.find('.prev').removeClass('disabled');
}
if (offset >= images.length - 1) {
this._header.find('.next').addClass('disabled');
} else {
this._header.find('.next').removeClass('disabled');
}
var tm = +new Date();
_img_loader_tm = tm;
preload_image(url, function(url, w, h){
if (_img_loader_tm !== tm) {
return;
}
self._image.attr('src', url);
var show_pic = function(){
if (!self.updateImageSize(w, h)) {
setTimeout(show_pic, 200);
} else {
self._loading.hide();
self._image.addClass('ready');
if (scale_cache) {
self._changeImageScale(scale_cache, {
autoTop: true
});
}
}
};
show_pic();
preload_image(images[offset - 1]);
preload_image(images[offset + 1]);
});
this.event.fire('changeImage', [url, offset]);
},
getCurrentImage: function(){
return {
url: this._image.attr('src'),
offset: this._imagesOffset
};
},
cancel: function(){
this.event.fire('cancel', [this]);
this.close();
return this.event.promise('close');
},
applyOpen: function(){
var re = this.superMethod('applyOpen', arguments);
this.setImage(this._config.offset);
return re;
},
applyClose: function(){
this._image.removeClass('ready');
return this.superMethod('applyClose', arguments);
}
});
function preload_image(url, fn){
if (!url) {
return;
}
var img = _piclib[url];
if (Array.isArray(img)) {
setTimeout(done, 0);
} else if (img) {
$(img).on('load', function(){
img = _piclib[url] = [img.width, img.height];
done();
});
} else {
img = new Image();
_piclib[url] = $(img).on('load', function(){
img = _piclib[url] = [img.width, img.height];
done();
})[0];
img.src = url;
}
function done(){
if (fn) {
fn(url, img[0], img[1]);
}
}
}
function adapted_size(w, h, max_w, max_h){
var r = w / h;
if (r > 1) {
if (w !== max_w) {
w = max_w;
}
h = w / r;
if (h > max_h) {
h = max_h;
}
w = h * r;
} else {
if (h !== max_h) {
h = max_h;
}
w = h * r;
if (w > max_w) {
w = max_w;
}
h = w / r;
}
return [w, h];
}
function exports(opt) {
return new exports.ImageView(opt);
}
exports.ImageView = ImageView;
exports.adaptedSize = adapted_size;
exports.preloadImage = preload_image;
return exports;
});