New file |
0,0 → 1,1169 |
/* |
* iviewer Widget for jQuery UI |
* https://github.com/can3p/iviewer |
* |
* Copyright (c) 2009 - 2012 Dmitry Petrov |
* Dual licensed under the MIT and GPL licenses. |
* - http://www.opensource.org/licenses/mit-license.php |
* - http://www.gnu.org/copyleft/gpl.html |
* |
* Author: Dmitry Petrov |
* Version: 0.7.7 |
*/ |
|
( function( $, undefined ) { |
|
//this code was taken from the https://github.com/furf/jquery-ui-touch-punch |
var mouseEvents = { |
touchstart: 'mousedown', |
touchmove: 'mousemove', |
touchend: 'mouseup' |
}, |
gesturesSupport = 'ongesturestart' in document.createElement('div'); |
|
|
/** |
* Convert a touch event to a mouse-like |
*/ |
function makeMouseEvent (event) { |
var touch = event.originalEvent.changedTouches[0]; |
|
return $.extend(event, { |
type: mouseEvents[event.type], |
which: 1, |
pageX: touch.pageX, |
pageY: touch.pageY, |
screenX: touch.screenX, |
screenY: touch.screenY, |
clientX: touch.clientX, |
clientY: touch.clientY, |
isTouchEvent: true |
}); |
} |
|
var mouseProto = $.ui.mouse.prototype, |
_mouseInit = $.ui.mouse.prototype._mouseInit; |
|
mouseProto._mouseInit = function() { |
var self = this; |
self._touchActive = false; |
|
this.element.bind( 'touchstart.' + this.widgetName, function(event) { |
if (gesturesSupport && event.originalEvent.touches.length > 1) { return; } |
self._touchActive = true; |
return self._mouseDown(makeMouseEvent(event)); |
}) |
|
var self = this; |
// these delegates are required to keep context |
this._mouseMoveDelegate = function(event) { |
if (gesturesSupport && event.originalEvent.touches && event.originalEvent.touches.length > 1) { return; } |
if (self._touchActive) { |
return self._mouseMove(makeMouseEvent(event)); |
} |
}; |
this._mouseUpDelegate = function(event) { |
if (self._touchActive) { |
self._touchActive = false; |
return self._mouseUp(makeMouseEvent(event)); |
} |
}; |
|
$(document) |
.bind('touchmove.'+ this.widgetName, this._mouseMoveDelegate) |
.bind('touchend.' + this.widgetName, this._mouseUpDelegate); |
|
_mouseInit.apply(this); |
} |
|
/** |
* Simple implementation of jQuery like getters/setters |
* var val = something(); |
* something(val); |
*/ |
var setter = function(setter, getter) { |
return function(val) { |
if (arguments.length === 0) { |
return getter.apply(this); |
} else { |
setter.apply(this, arguments); |
} |
} |
}; |
|
/** |
* Internet explorer rotates image relative left top corner, so we should |
* shift image when it's rotated. |
*/ |
var ieTransforms = { |
'0': { |
marginLeft: 0, |
marginTop: 0, |
filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod="auto expand")' |
}, |
|
'90': { |
marginLeft: -1, |
marginTop: 1, |
filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=-1, M21=1, M22=0, SizingMethod="auto expand")' |
}, |
|
'180': { |
marginLeft: 0, |
marginTop: 0, |
filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=-1, M12=0, M21=0, M22=-1, SizingMethod="auto expand")' |
}, |
|
'270': { |
marginLeft: -1, |
marginTop: 1, |
filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=1, M21=-1, M22=0, SizingMethod="auto expand")' |
} |
}, |
// this test is the inversion of the css filters test from the modernizr project |
useIeTransforms = function() { |
var modElem = document.createElement('modernizr'), |
mStyle = modElem.style, |
omPrefixes = 'Webkit Moz O ms', |
domPrefixes = omPrefixes.toLowerCase().split(' '), |
props = ("transform" + ' ' + domPrefixes.join("Transform ") + "Transform").split(' '); |
for ( var i in props ) { |
var prop = props[i]; |
if ( !$.contains(prop, "-") && mStyle[prop] !== undefined ) { |
return false; |
} |
} |
return true; |
}(); |
|
$.widget( "ui.iviewer", $.ui.mouse, { |
widgetEventPrefix: "iviewer", |
options : { |
/** |
* start zoom value for image, not used now |
* may be equal to "fit" to fit image into container or scale in % |
**/ |
zoom: "fit", |
/** |
* base value to scale image |
**/ |
zoom_base: 100, |
/** |
* maximum zoom |
**/ |
zoom_max: 800, |
/** |
* minimum zoom |
**/ |
zoom_min: 25, |
/** |
* base of rate multiplier. |
* zoom is calculated by formula: zoom_base * zoom_delta^rate |
**/ |
zoom_delta: 1.4, |
/** |
* whether the zoom should be animated. |
*/ |
zoom_animation: true, |
/** |
* if true plugin doesn't add its own controls |
**/ |
ui_disabled: false, |
/** |
* If false mousewheel will be disabled |
*/ |
mousewheel: true, |
/** |
* if false, plugin doesn't bind resize event on window and this must |
* be handled manually |
**/ |
update_on_resize: true, |
/** |
* event is triggered when zoom value is changed |
* @param int new zoom value |
* @return boolean if false zoom action is aborted |
**/ |
onZoom: jQuery.noop, |
/** |
* event is triggered when zoom value is changed after image is set to the new dimensions |
* @param int new zoom value |
* @return boolean if false zoom action is aborted |
**/ |
onAfterZoom: jQuery.noop, |
/** |
* event is fired on drag begin |
* @param object coords mouse coordinates on the image |
* @return boolean if false is returned, drag action is aborted |
**/ |
onStartDrag: jQuery.noop, |
/** |
* event is fired on drag action |
* @param object coords mouse coordinates on the image |
**/ |
onDrag: jQuery.noop, |
/** |
* event is fired on drag stop |
* @param object coords mouse coordinates on the image |
**/ |
onStopDrag: jQuery.noop, |
/** |
* event is fired when mouse moves over image |
* @param object coords mouse coordinates on the image |
**/ |
onMouseMove: jQuery.noop, |
/** |
* mouse click event |
* @param object coords mouse coordinates on the image |
**/ |
onClick: jQuery.noop, |
/** |
* event is fired when image starts to load |
*/ |
onStartLoad: null, |
/** |
* event is fired, when image is loaded and initially positioned |
*/ |
onFinishLoad: null, |
/** |
* event is fired when image load error occurs |
*/ |
onErrorLoad: null |
}, |
|
_create: function() { |
var me = this; |
|
//drag variables |
this.dx = 0; |
this.dy = 0; |
|
/* object containing actual information about image |
* @img_object.object - jquery img object |
* @img_object.orig_{width|height} - original dimensions |
* @img_object.display_{width|height} - actual dimensions |
*/ |
this.img_object = {}; |
|
this.zoom_object = {}; //object to show zoom status |
|
this._angle = 0; |
|
this.current_zoom = this.options.zoom; |
|
if(this.options.src === null){ |
return; |
} |
|
this.container = this.element; |
|
this._updateContainerInfo(); |
|
//init container |
this.container.css("overflow","hidden"); |
|
if (this.options.update_on_resize == true) { |
$(window).resize(function() { |
me.update(); |
}); |
} |
|
this.img_object = new $.ui.iviewer.ImageObject(this.options.zoom_animation); |
|
if (this.options.mousewheel) { |
this.container.bind('mousewheel.iviewer', function(ev, delta) |
{ |
//this event is there instead of containing div, because |
//at opera it triggers many times on div |
var zoom = (delta > 0)?1:-1, |
container_offset = me.container.offset(), |
mouse_pos = { |
//jquery.mousewheel 3.1.0 uses strange MozMousePixelScroll event |
//which is not being fixed by jQuery.Event |
x: (ev.pageX || ev.originalEvent.pageX) - container_offset.left, |
y: (ev.pageY || ev.originalEvent.pageX) - container_offset.top |
}; |
|
me.zoom_by(zoom, mouse_pos); |
return false; |
}); |
|
if (gesturesSupport) { |
var gestureThrottle = +new Date(); |
var originalScale, originalCenter; |
this.img_object.object() |
// .bind('gesturestart', function(ev) { |
.bind('touchstart', function(ev) { |
originalScale = me.current_zoom; |
var touches = ev.originalEvent.touches, |
container_offset; |
if (touches.length == 2) { |
container_offset = me.container.offset(); |
originalCenter = { |
x: (touches[0].pageX + touches[1].pageX) / 2 - container_offset.left, |
y: (touches[0].pageY + touches[1].pageY) / 2 - container_offset.top |
}; |
} else { |
originalCenter = null; |
} |
}).bind('gesturechange', function(ev) { |
//do not want to import throttle function from underscore |
var d = +new Date(); |
if ((d - gestureThrottle) < 50) { return; } |
gestureThrottle = d; |
var zoom = originalScale * ev.originalEvent.scale; |
me.set_zoom(zoom, originalCenter); |
ev.preventDefault(); |
}).bind('gestureend', function(ev) { |
originalCenter = null; |
}); |
} |
} |
|
//init object |
this.img_object.object() |
//bind mouse events |
.click(function(e){return me._click(e)}) |
.prependTo(this.container); |
|
this.container.bind('mousemove', function(ev) { me._handleMouseMove(ev); }); |
|
this.loadImage(this.options.src); |
|
if(!this.options.ui_disabled) |
{ |
this.createui(); |
} |
|
this._mouseInit(); |
}, |
|
destroy: function() { |
$.Widget.prototype.destroy.call( this ); |
this._mouseDestroy(); |
this.img_object.object().remove(); |
this.container.off('.iviewer'); |
this.container.css('overflow', ''); //cleanup styles on destroy |
}, |
|
_updateContainerInfo: function() |
{ |
this.options.height = this.container.height(); |
this.options.width = this.container.width(); |
}, |
|
update: function() |
{ |
this._updateContainerInfo() |
this.setCoords(this.img_object.x(), this.img_object.y()); |
}, |
|
loadImage: function( src ) |
{ |
this.current_zoom = this.options.zoom; |
var me = this; |
|
this._trigger('onStartLoad', 0, src); |
|
this.container.addClass("iviewer_loading"); |
this.img_object.load(src, function() { |
me._imageLoaded(src); |
}, function() { |
me._trigger("onErrorLoad", 0, src); |
}); |
}, |
|
_imageLoaded: function(src) { |
this.container.removeClass("iviewer_loading"); |
this.container.addClass("iviewer_cursor"); |
|
if(this.options.zoom == "fit"){ |
this.fit(true); |
} |
else { |
this.set_zoom(this.options.zoom, true); |
} |
|
this._trigger('onFinishLoad', 0, src); |
}, |
|
/** |
* fits image in the container |
* |
* @param {boolean} skip_animation |
**/ |
fit: function(skip_animation) |
{ |
var aspect_ratio = this.img_object.orig_width() / this.img_object.orig_height(); |
var window_ratio = this.options.width / this.options.height; |
var choose_left = (aspect_ratio > window_ratio); |
var new_zoom = 0; |
|
if(choose_left){ |
new_zoom = this.options.width / this.img_object.orig_width() * 100; |
} |
else { |
new_zoom = this.options.height / this.img_object.orig_height() * 100; |
} |
|
this.set_zoom(new_zoom, skip_animation); |
}, |
|
/** |
* center image in container |
**/ |
center: function() |
{ |
this.setCoords(-Math.round((this.img_object.display_width() - this.options.width)/2), |
-Math.round((this.img_object.display_height() - this.options.height)/2)); |
}, |
|
/** |
* move a point in container to the center of display area |
* @param x a point in container |
* @param y a point in container |
**/ |
moveTo: function(x, y) |
{ |
var dx = x-Math.round(this.options.width/2); |
var dy = y-Math.round(this.options.height/2); |
|
var new_x = this.img_object.x() - dx; |
var new_y = this.img_object.y() - dy; |
|
this.setCoords(new_x, new_y); |
}, |
|
/** |
* Get container offset object. |
*/ |
getContainerOffset: function() { |
return jQuery.extend({}, this.container.offset()); |
}, |
|
/** |
* set coordinates of upper left corner of image object |
**/ |
setCoords: function(x,y) |
{ |
//do nothing while image is being loaded |
if(!this.img_object.loaded()) { return; } |
|
var coords = this._correctCoords(x,y); |
this.img_object.x(coords.x); |
this.img_object.y(coords.y); |
}, |
|
_correctCoords: function( x, y ) |
{ |
x = parseInt(x, 10); |
y = parseInt(y, 10); |
|
//check new coordinates to be correct (to be in rect) |
if(y > 0){ |
y = 0; |
} |
if(x > 0){ |
x = 0; |
} |
if(y + this.img_object.display_height() < this.options.height){ |
y = this.options.height - this.img_object.display_height(); |
} |
if(x + this.img_object.display_width() < this.options.width){ |
x = this.options.width - this.img_object.display_width(); |
} |
if(this.img_object.display_width() <= this.options.width){ |
x = -(this.img_object.display_width() - this.options.width)/2; |
} |
if(this.img_object.display_height() <= this.options.height){ |
y = -(this.img_object.display_height() - this.options.height)/2; |
} |
|
return { x: x, y:y }; |
}, |
|
|
/** |
* convert coordinates on the container to the coordinates on the image (in original size) |
* |
* @return object with fields x,y according to coordinates or false |
* if initial coords are not inside image |
**/ |
containerToImage : function (x,y) |
{ |
var coords = { x : x - this.img_object.x(), |
y : y - this.img_object.y() |
}; |
|
coords = this.img_object.toOriginalCoords(coords); |
|
return { x : util.descaleValue(coords.x, this.current_zoom), |
y : util.descaleValue(coords.y, this.current_zoom) |
}; |
}, |
|
/** |
* convert coordinates on the image (in original size, and zero angle) to the coordinates on the container |
* |
* @return object with fields x,y according to coordinates |
**/ |
imageToContainer : function (x,y) |
{ |
var coords = { |
x : util.scaleValue(x, this.current_zoom), |
y : util.scaleValue(y, this.current_zoom) |
}; |
|
return this.img_object.toRealCoords(coords); |
}, |
|
/** |
* get mouse coordinates on the image |
* @param e - object containing pageX and pageY fields, e.g. mouse event object |
* |
* @return object with fields x,y according to coordinates or false |
* if initial coords are not inside image |
**/ |
_getMouseCoords : function(e) |
{ |
var containerOffset = this.container.offset(); |
coords = this.containerToImage(e.pageX - containerOffset.left, e.pageY - containerOffset.top); |
|
return coords; |
}, |
|
/** |
* set image scale to the new_zoom |
* |
* @param {number} new_zoom image scale in % |
* @param {boolean} skip_animation |
* @param {x: number, y: number} Coordinates of point the should not be moved on zoom. The default is the center of image. |
**/ |
set_zoom: function(new_zoom, skip_animation, zoom_center) |
{ |
if (this._trigger('onZoom', 0, new_zoom) == false) { |
return; |
} |
|
//do nothing while image is being loaded |
if(!this.img_object.loaded()) { return; } |
|
zoom_center = zoom_center || { |
x: Math.round(this.options.width/2), |
y: Math.round(this.options.height/2) |
} |
|
if(new_zoom < this.options.zoom_min) |
{ |
new_zoom = this.options.zoom_min; |
} |
else if(new_zoom > this.options.zoom_max) |
{ |
new_zoom = this.options.zoom_max; |
} |
|
/* we fake these values to make fit zoom properly work */ |
if(this.current_zoom == "fit") |
{ |
var old_x = zoom_center.x + Math.round(this.img_object.orig_width()/2); |
var old_y = zoom_center.y + Math.round(this.img_object.orig_height()/2); |
this.current_zoom = 100; |
} |
else { |
var old_x = -this.img_object.x() + zoom_center.x; |
var old_y = -this.img_object.y() + zoom_center.y |
} |
|
var new_width = util.scaleValue(this.img_object.orig_width(), new_zoom); |
var new_height = util.scaleValue(this.img_object.orig_height(), new_zoom); |
var new_x = util.scaleValue( util.descaleValue(old_x, this.current_zoom), new_zoom); |
var new_y = util.scaleValue( util.descaleValue(old_y, this.current_zoom), new_zoom); |
|
new_x = zoom_center.x - new_x; |
new_y = zoom_center.y - new_y; |
|
new_width = Math.floor(new_width); |
new_height = Math.floor(new_height); |
new_x = Math.floor(new_x); |
new_y = Math.floor(new_y); |
|
this.img_object.display_width(new_width); |
this.img_object.display_height(new_height); |
|
var coords = this._correctCoords( new_x, new_y ), |
self = this; |
|
this.img_object.setImageProps(new_width, new_height, coords.x, coords.y, |
skip_animation, function() { |
self._trigger('onAfterZoom', 0, new_zoom ); |
}); |
this.current_zoom = new_zoom; |
|
this.update_status(); |
}, |
|
/** |
* changes zoom scale by delta |
* zoom is calculated by formula: zoom_base * zoom_delta^rate |
* @param Integer delta number to add to the current multiplier rate number |
* @param {x: number, y: number=} Coordinates of point the should not be moved on zoom. |
**/ |
zoom_by: function(delta, zoom_center) |
{ |
var closest_rate = this.find_closest_zoom_rate(this.current_zoom); |
|
var next_rate = closest_rate + delta; |
var next_zoom = this.options.zoom_base * Math.pow(this.options.zoom_delta, next_rate) |
if(delta > 0 && next_zoom < this.current_zoom) |
{ |
next_zoom *= this.options.zoom_delta; |
} |
|
if(delta < 0 && next_zoom > this.current_zoom) |
{ |
next_zoom /= this.options.zoom_delta; |
} |
|
this.set_zoom(next_zoom, undefined, zoom_center); |
}, |
|
/** |
* Rotate image |
* @param {num} deg Degrees amount to rotate. Positive values rotate image clockwise. |
* Currently 0, 90, 180, 270 and -90, -180, -270 values are supported |
* |
* @param {boolean} abs If the flag is true if, the deg parameter will be considered as |
* a absolute value and relative otherwise. |
* @return {num|null} Method will return current image angle if called without any arguments. |
**/ |
angle: function(deg, abs) { |
if (arguments.length === 0) { return this.img_object.angle(); } |
|
if (deg < -270 || deg > 270 || deg % 90 !== 0) { return; } |
if (!abs) { deg += this.img_object.angle(); } |
if (deg < 0) { deg += 360; } |
if (deg >= 360) { deg -= 360; } |
|
if (deg === this.img_object.angle()) { return; } |
|
this.img_object.angle(deg); |
//the rotate behavior is different in all editors. For now we just center the |
//image. However, it will be better to try to keep the position. |
this.center(); |
this._trigger('angle', 0, { angle: this.img_object.angle() }); |
}, |
|
/** |
* finds closest multiplier rate for value |
* basing on zoom_base and zoom_delta values from settings |
* @param Number value zoom value to examine |
**/ |
find_closest_zoom_rate: function(value) |
{ |
if(value == this.options.zoom_base) |
{ |
return 0; |
} |
|
function div(val1,val2) { return val1 / val2 }; |
function mul(val1,val2) { return val1 * val2 }; |
|
var func = (value > this.options.zoom_base)?mul:div; |
var sgn = (value > this.options.zoom_base)?1:-1; |
|
var mltplr = this.options.zoom_delta; |
var rate = 1; |
|
while(Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate)) - value) > |
Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate+1)) - value)) |
{ |
rate++; |
} |
|
return sgn * rate; |
}, |
|
/* update scale info in the container */ |
update_status: function() |
{ |
if(!this.options.ui_disabled) |
{ |
var percent = Math.round(100*this.img_object.display_height()/this.img_object.orig_height()); |
if(percent) |
{ |
this.zoom_object.html(percent + "%"); |
} |
} |
}, |
|
/** |
* Get some information about the image. |
* Currently orig_(width|height), display_(width|height), angle, zoom and src params are supported. |
* |
* @param {string} parameter to check |
* @param {boolean} withoutRotation if param is orig_width or orig_height and this flag is set to true, |
* method will return original image width without considering rotation. |
* |
*/ |
info: function(param, withoutRotation) { |
if (!param) { return; } |
|
switch (param) { |
case 'orig_width': |
case 'orig_height': |
if (withoutRotation) { |
return (this.img_object.angle() % 180 === 0 ? this.img_object[param]() : |
param === 'orig_width' ? this.img_object.orig_height() : |
this.img_object.orig_width()); |
} else { |
return this.img_object[param](); |
} |
case 'display_width': |
case 'display_height': |
case 'angle': |
return this.img_object[param](); |
case 'zoom': |
return this.current_zoom; |
case 'src': |
return this.img_object.object().attr('src'); |
case 'coords': |
return { |
x: this.img_object.x(), |
y: this.img_object.y() |
}; |
} |
}, |
|
/** |
* callback for handling mousdown event to start dragging image |
**/ |
_mouseStart: function( e ) |
{ |
$.ui.mouse.prototype._mouseStart.call(this, e); |
if (this._trigger('onStartDrag', 0, this._getMouseCoords(e)) === false) { |
return false; |
} |
|
/* start drag event*/ |
this.container.addClass("iviewer_drag_cursor"); |
|
//#10: fix movement quirks for ipad |
this._dragInitialized = !(e.originalEvent.changedTouches && e.originalEvent.changedTouches.length==1); |
|
this.dx = e.pageX - this.img_object.x(); |
this.dy = e.pageY - this.img_object.y(); |
return true; |
}, |
|
_mouseCapture: function( e ) { |
return true; |
}, |
|
/** |
* Handle mouse move if needed. User can avoid using this callback, because |
* he can get the same information through public methods. |
* @param {jQuery.Event} e |
*/ |
_handleMouseMove: function(e) { |
this._trigger('onMouseMove', e, this._getMouseCoords(e)); |
}, |
|
/** |
* callback for handling mousemove event to drag image |
**/ |
_mouseDrag: function(e) |
{ |
$.ui.mouse.prototype._mouseDrag.call(this, e); |
|
//#10: imitate mouseStart, because we can get here without it on iPad for some reason |
if (!this._dragInitialized) { |
this.dx = e.pageX - this.img_object.x(); |
this.dy = e.pageY - this.img_object.y(); |
this._dragInitialized = true; |
} |
|
var ltop = e.pageY - this.dy; |
var lleft = e.pageX - this.dx; |
|
this.setCoords(lleft, ltop); |
this._trigger('onDrag', e, this._getMouseCoords(e)); |
return false; |
}, |
|
/** |
* callback for handling stop drag |
**/ |
_mouseStop: function(e) |
{ |
$.ui.mouse.prototype._mouseStop.call(this, e); |
this.container.removeClass("iviewer_drag_cursor"); |
this._trigger('onStopDrag', 0, this._getMouseCoords(e)); |
}, |
|
_click: function(e) |
{ |
this._trigger('onClick', 0, this._getMouseCoords(e)); |
}, |
|
/** |
* create zoom buttons info box |
**/ |
createui: function() |
{ |
var me=this; |
|
$("<div>", { 'class': "iviewer_zoom_in iviewer_common iviewer_button"}) |
.bind('mousedown touchstart',function(){me.zoom_by(1); return false;}) |
.appendTo(this.container); |
|
$("<div>", { 'class': "iviewer_zoom_out iviewer_common iviewer_button"}) |
.bind('mousedown touchstart',function(){me.zoom_by(- 1); return false;}) |
.appendTo(this.container); |
|
$("<div>", { 'class': "iviewer_zoom_zero iviewer_common iviewer_button"}) |
.bind('mousedown touchstart',function(){me.set_zoom(100); return false;}) |
.appendTo(this.container); |
|
$("<div>", { 'class': "iviewer_zoom_fit iviewer_common iviewer_button"}) |
.bind('mousedown touchstart',function(){me.fit(this); return false;}) |
.appendTo(this.container); |
|
this.zoom_object = $("<div>").addClass("iviewer_zoom_status iviewer_common") |
.appendTo(this.container); |
|
$("<div>", { 'class': "iviewer_rotate_left iviewer_common iviewer_button"}) |
.bind('mousedown touchstart',function(){me.angle(-90); return false;}) |
.appendTo(this.container); |
|
$("<div>", { 'class': "iviewer_rotate_right iviewer_common iviewer_button" }) |
.bind('mousedown touchstart',function(){me.angle(90); return false;}) |
.appendTo(this.container); |
|
this.update_status(); //initial status update |
} |
|
} ); |
|
/** |
* @class $.ui.iviewer.ImageObject Class represents image and provides public api without |
* extending image prototype. |
* @constructor |
* @param {boolean} do_anim Do we want to animate image on dimension changes? |
*/ |
$.ui.iviewer.ImageObject = function(do_anim) { |
this._img = $("<img>") |
//this is needed, because chromium sets them auto otherwise |
.css({ position: "absolute", top :"0px", left: "0px"}); |
|
this._loaded = false; |
this._swapDimensions = false; |
this._do_anim = do_anim || false; |
this.x(0, true); |
this.y(0, true); |
this.angle(0); |
}; |
|
|
/** @lends $.ui.iviewer.ImageObject.prototype */ |
(function() { |
/** |
* Restore initial object state. |
* |
* @param {number} w Image width. |
* @param {number} h Image height. |
*/ |
this._reset = function(w, h) { |
this._angle = 0; |
this._swapDimensions = false; |
this.x(0); |
this.y(0); |
|
this.orig_width(w); |
this.orig_height(h); |
this.display_width(w); |
this.display_height(h); |
}; |
|
/** |
* Check if image is loaded. |
* |
* @return {boolean} |
*/ |
this.loaded = function() { return this._loaded; }; |
|
/** |
* Load image. |
* |
* @param {string} src Image url. |
* @param {Function=} loaded Function will be called on image load. |
*/ |
this.load = function(src, loaded, error) { |
var self = this; |
|
loaded = loaded || jQuery.noop; |
this._loaded = false; |
|
//If we assign new image url to the this._img IE9 fires onload event and image width and |
//height are set to zero. So, we create another image object and load image through it. |
var img = new Image(); |
img.onload = function() { |
self._loaded = true; |
self._reset(this.width, this.height); |
|
self._img |
.removeAttr("width") |
.removeAttr("height") |
.removeAttr("style") |
//max-width is reset, because plugin breaks in the twitter bootstrap otherwise |
.css({ position: "absolute", top :"0px", left: "0px", maxWidth: "none"}) |
|
self._img[0].src = src; |
loaded(); |
}; |
|
img.onerror = error; |
|
//we need this because sometimes internet explorer 8 fires onload event |
//right after assignment (synchronously) |
setTimeout(function() { |
img.src = src; |
}, 0); |
|
this.angle(0); |
}; |
|
this._dimension = function(prefix, name) { |
var horiz = '_' + prefix + '_' + name, |
vert = '_' + prefix + '_' + (name === 'height' ? 'width' : 'height'); |
return setter(function(val) { |
this[this._swapDimensions ? horiz: vert] = val; |
}, |
function() { |
return this[this._swapDimensions ? horiz: vert]; |
}); |
}; |
|
/** |
* Getters and setter for common image dimensions. |
* display_ means real image tag dimensions |
* orig_ means physical image dimensions. |
* Note, that dimensions are swapped if image is rotated. It necessary, |
* because as little as possible code should know about rotation. |
*/ |
this.display_width = this._dimension('display', 'width'), |
this.display_height = this._dimension('display', 'height'), |
this.display_diff = function() { return Math.floor( this.display_width() - this.display_height() ) }; |
this.orig_width = this._dimension('orig', 'width'), |
this.orig_height = this._dimension('orig', 'height'), |
|
/** |
* Setter for X coordinate. If image is rotated we need to additionaly shift an |
* image to map image coordinate to the visual position. |
* |
* @param {number} val Coordinate value. |
* @param {boolean} skipCss If true, we only set the value and do not touch the dom. |
*/ |
this.x = setter(function(val, skipCss) { |
this._x = val; |
if (!skipCss) { |
this._finishAnimation(); |
this._img.css("left",this._x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px"); |
} |
}, |
function() { |
return this._x; |
}); |
|
/** |
* Setter for Y coordinate. If image is rotated we need to additionaly shift an |
* image to map image coordinate to the visual position. |
* |
* @param {number} val Coordinate value. |
* @param {boolean} skipCss If true, we only set the value and do not touch the dom. |
*/ |
this.y = setter(function(val, skipCss) { |
this._y = val; |
if (!skipCss) { |
this._finishAnimation(); |
this._img.css("top",this._y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px"); |
} |
}, |
function() { |
return this._y; |
}); |
|
/** |
* Perform image rotation. |
* |
* @param {number} deg Absolute image angle. The method will work with values 0, 90, 180, 270 degrees. |
*/ |
this.angle = setter(function(deg) { |
var prevSwap = this._swapDimensions; |
|
this._angle = deg; |
this._swapDimensions = deg % 180 !== 0; |
|
if (prevSwap !== this._swapDimensions) { |
var verticalMod = this._swapDimensions ? -1 : 1; |
this.x(this.x() - verticalMod * this.display_diff() / 2, true); |
this.y(this.y() + verticalMod * this.display_diff() / 2, true); |
}; |
|
var cssVal = 'rotate(' + deg + 'deg)', |
img = this._img; |
|
jQuery.each(['', '-webkit-', '-moz-', '-o-', '-ms-'], function(i, prefix) { |
img.css(prefix + 'transform', cssVal); |
}); |
|
if (useIeTransforms) { |
jQuery.each(['-ms-', ''], function(i, prefix) { |
img.css(prefix + 'filter', ieTransforms[deg].filter); |
}); |
|
img.css({ |
marginLeft: ieTransforms[deg].marginLeft * this.display_diff() / 2, |
marginTop: ieTransforms[deg].marginTop * this.display_diff() / 2 |
}); |
} |
}, |
function() { return this._angle; }); |
|
/** |
* Map point in the container coordinates to the point in image coordinates. |
* You will get coordinates of point on image with respect to rotation, |
* but will be set as if image was not rotated. |
* So, if image was rotated 90 degrees, it's (0,0) point will be on the |
* top right corner. |
* |
* @param {{x: number, y: number}} point Point in container coordinates. |
* @return {{x: number, y: number}} |
*/ |
this.toOriginalCoords = function(point) { |
switch (this.angle()) { |
case 0: return { x: point.x, y: point.y } |
case 90: return { x: point.y, y: this.display_width() - point.x } |
case 180: return { x: this.display_width() - point.x, y: this.display_height() - point.y } |
case 270: return { x: this.display_height() - point.y, y: point.x } |
} |
}; |
|
/** |
* Map point in the image coordinates to the point in container coordinates. |
* You will get coordinates of point on container with respect to rotation. |
* Note, if image was rotated 90 degrees, it's (0,0) point will be on the |
* top right corner. |
* |
* @param {{x: number, y: number}} point Point in container coordinates. |
* @return {{x: number, y: number}} |
*/ |
this.toRealCoords = function(point) { |
switch (this.angle()) { |
case 0: return { x: this.x() + point.x, y: this.y() + point.y } |
case 90: return { x: this.x() + this.display_width() - point.y, y: this.y() + point.x} |
case 180: return { x: this.x() + this.display_width() - point.x, y: this.y() + this.display_height() - point.y} |
case 270: return { x: this.x() + point.y, y: this.y() + this.display_height() - point.x} |
} |
}; |
|
/** |
* @return {jQuery} Return image node. this is needed to add event handlers. |
*/ |
this.object = setter(jQuery.noop, |
function() { return this._img; }); |
|
/** |
* Change image properties. |
* |
* @param {number} disp_w Display width; |
* @param {number} disp_h Display height; |
* @param {number} x |
* @param {number} y |
* @param {boolean} skip_animation If true, the animation will be skiped despite the |
* value set in constructor. |
* @param {Function=} complete Call back will be fired when zoom will be complete. |
*/ |
this.setImageProps = function(disp_w, disp_h, x, y, skip_animation, complete) { |
complete = complete || jQuery.noop; |
|
this.display_width(disp_w); |
this.display_height(disp_h); |
this.x(x, true); |
this.y(y, true); |
|
var w = this._swapDimensions ? disp_h : disp_w; |
var h = this._swapDimensions ? disp_w : disp_h; |
|
var params = { |
width: w, |
height: h, |
top: y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px", |
left: x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px" |
}; |
|
if (useIeTransforms) { |
jQuery.extend(params, { |
marginLeft: ieTransforms[this.angle()].marginLeft * this.display_diff() / 2, |
marginTop: ieTransforms[this.angle()].marginTop * this.display_diff() / 2 |
}); |
} |
|
var swapDims = this._swapDimensions, |
img = this._img; |
|
//here we come: another IE oddness. If image is rotated 90 degrees with a filter, than |
//width and height getters return real width and height of rotated image. The bad news |
//is that to set height you need to set a width and vice versa. Fuck IE. |
//So, in this case we have to animate width and height manually. |
if(useIeTransforms && swapDims) { |
var ieh = this._img.width(), |
iew = this._img.height(), |
iedh = params.height - ieh; |
iedw = params.width - iew; |
|
delete params.width; |
delete params.height; |
} |
|
if (this._do_anim && !skip_animation) { |
this._img.stop(true) |
.animate(params, { |
duration: 200, |
complete: complete, |
step: function(now, fx) { |
if(useIeTransforms && swapDims && (fx.prop === 'top')) { |
var percent = (now - fx.start) / (fx.end - fx.start); |
|
img.height(ieh + iedh * percent); |
img.width(iew + iedw * percent); |
img.css('top', now); |
} |
} |
}); |
} else { |
this._img.css(params); |
setTimeout(complete, 0); //both if branches should behave equally. |
} |
}; |
|
//if we set image coordinates we need to be sure that no animation is active atm |
this._finishAnimation = function() { |
this._img.stop(true, true); |
} |
|
}).apply($.ui.iviewer.ImageObject.prototype); |
|
|
|
var util = { |
scaleValue: function(value, toZoom) |
{ |
return value * toZoom / 100; |
}, |
|
descaleValue: function(value, fromZoom) |
{ |
return value * 100 / fromZoom; |
} |
}; |
|
} )( jQuery, undefined ); |