48 lines
18 KiB
JavaScript
48 lines
18 KiB
JavaScript
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/*
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* iviewer Widget for jQuery UI
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* https://github.com/can3p/iviewer
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*
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* Copyright (c) 2009 - 2012 Dmitry Petrov
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* Dual licensed under the MIT and GPL licenses.
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* - http://www.opensource.org/licenses/mit-license.php
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* - http://www.gnu.org/copyleft/gpl.html
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*
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* Author: Dmitry Petrov
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* Version: 0.7.7
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*/
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(function($,undefined){var mouseEvents={touchstart:"mousedown",touchmove:"mousemove",touchend:"mouseup"},gesturesSupport="ongesturestart"in document.createElement("div");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=$.ui.mouse.prototype._mouseInit;
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mouseProto._mouseInit=function(){var self=this;self._touchActive=false;this.element.bind("touchstart."+this.widgetName,function(event){if(gesturesSupport&&event.originalEvent.touches.length>1)return;self._touchActive=true;return self._mouseDown(makeMouseEvent(event))});var self=this;this._mouseMoveDelegate=function(event){if(gesturesSupport&&event.originalEvent.touches&&event.originalEvent.touches.length>1)return;if(self._touchActive)return self._mouseMove(makeMouseEvent(event))};this._mouseUpDelegate=
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function(event){if(self._touchActive){self._touchActive=false;return self._mouseUp(makeMouseEvent(event))}};$(document).bind("touchmove."+this.widgetName,this._mouseMoveDelegate).bind("touchend."+this.widgetName,this._mouseUpDelegate);_mouseInit.apply(this)};var setter=function(setter,getter){return function(val){if(arguments.length===0)return getter.apply(this);else setter.apply(this,arguments)}};var ieTransforms={"0":{marginLeft:0,marginTop:0,filter:'progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod="auto expand")'},
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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")'}},useIeTransforms=function(){var el=document.createElement("div");el.style.cssText=["-ms-",
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"",""].join("filter:blur(2px); ");return!!el.style.cssText&&document.documentMode<9}();$.widget("ui.iviewer",$.ui.mouse,{widgetEventPrefix:"iviewer",options:{zoom:"fit",zoom_base:100,zoom_max:800,zoom_min:25,zoom_delta:1.4,zoom_animation:true,ui_disabled:false,mousewheel:true,update_on_resize:true,onZoom:jQuery.noop,onAfterZoom:jQuery.noop,onStartDrag:jQuery.noop,onDrag:jQuery.noop,onStopDrag:jQuery.noop,onMouseMove:jQuery.noop,onClick:jQuery.noop,onStartLoad:null,onFinishLoad:null,onErrorLoad:null},
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_create:function(){var me=this;this.dx=0;this.dy=0;this.img_object={};this.zoom_object={};this._angle=0;this.current_zoom=this.options.zoom;if(this.options.src===null)return;this.container=this.element;this._updateContainerInfo();this.container.css("overflow","hidden");if(this.options.update_on_resize==true)$(window).resize(function(){me.update()});this.img_object=new $.ui.iviewer.ImageObject(this.options.zoom_animation);if(this.options.mousewheel){this.container.bind("mousewheel.iviewer",function(ev,
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delta){var zoom=delta>0?1:-1,container_offset=me.container.offset(),mouse_pos={x:ev.pageX-container_offset.left,y:ev.pageY-container_offset.top};me.zoom_by(zoom,mouse_pos);return false});if(gesturesSupport){var gestureThrottle=+new Date;var originalScale,originalCenter;this.img_object.object().bind("touchstart",function(ev){originalScale=me.current_zoom;var touches=ev.originalEvent.touches,container_offset;if(touches.length==2){container_offset=me.container.offset();originalCenter={x:(touches[0].pageX+
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touches[1].pageX)/2-container_offset.left,y:(touches[0].pageY+touches[1].pageY)/2-container_offset.top}}else originalCenter=null}).bind("gesturechange",function(ev){var d=+new Date;if(d-gestureThrottle<50)return;gestureThrottle=d;var zoom=originalScale*ev.originalEvent.scale;me.set_zoom(zoom,originalCenter);ev.preventDefault()}).bind("gestureend",function(ev){originalCenter=null})}}this.img_object.object().click(function(e){return me._click(e)}).prependTo(this.container);this.container.bind("mousemove",
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function(ev){me._handleMouseMove(ev)});this.loadImage(this.options.src);if(!this.options.ui_disabled)this.createui();this._mouseInit()},destroy:function(){$.Widget.prototype.destroy.call(this);this._mouseDestroy();this.img_object.object().remove();this.container.off(".iviewer");this.container.css("overflow","")},_updateContainerInfo:function(){this.options.height=this.container.height();this.options.width=this.container.width()},update:function(){this._updateContainerInfo();this.setCoords(this.img_object.x(),
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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",
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0,src)},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:function(){this.setCoords(-Math.round((this.img_object.display_width()-this.options.width)/
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2),-Math.round((this.img_object.display_height()-this.options.height)/2))},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)},getContainerOffset:function(){return jQuery.extend({},this.container.offset())},setCoords:function(x,y){if(!this.img_object.loaded())return;var coords=this._correctCoords(x,y);this.img_object.x(coords.x);this.img_object.y(coords.y)},
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_correctCoords:function(x,y){x=parseInt(x,10);y=parseInt(y,10);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()-
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this.options.height)/2;return{x:x,y:y}},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)}},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)},_getMouseCoords:function(e){var containerOffset=this.container.offset();
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coords=this.containerToImage(e.pageX-containerOffset.left,e.pageY-containerOffset.top);return coords},set_zoom:function(new_zoom,skip_animation,zoom_center){if(this._trigger("onZoom",0,new_zoom)==false)return;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;if(this.current_zoom=="fit"){var old_x=
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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,
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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()},
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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)},angle:function(deg,abs){if(arguments.length===0)return this.img_object.angle();if(deg<-270||
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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);this.center();this._trigger("angle",0,{angle:this.img_object.angle()})},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=
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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_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+"%")}},info:function(param,withoutRotation){if(!param)return;switch(param){case "orig_width":case "orig_height":if(withoutRotation)return this.img_object.angle()%
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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()}}},_mouseStart:function(e){$.ui.mouse.prototype._mouseStart.call(this,e);if(this._trigger("onStartDrag",0,
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this._getMouseCoords(e))===false)return false;this.container.addClass("iviewer_drag_cursor");this._dragInitialized=!(e.originalEvent.changedTouches&&e.originalEvent.changedTouches.length==1);this.dx=e.pageX-this.img_object.x();this.dy=e.pageY-this.img_object.y();return true},_mouseCapture:function(e){return true},_handleMouseMove:function(e){this._trigger("onMouseMove",e,this._getMouseCoords(e))},_mouseDrag:function(e){$.ui.mouse.prototype._mouseDrag.call(this,e);if(!this._dragInitialized){this.dx=
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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},_mouseStop:function(e){$.ui.mouse.prototype._mouseStop.call(this,e);this.container.removeClass("iviewer_drag_cursor");this._trigger("onStopDrag",0,this._getMouseCoords(e))},_click:function(e){this._trigger("onClick",0,this._getMouseCoords(e))},createui:function(){var me=
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this;$("<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);$("<div>",
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{"class":"iviewer_zoom_fit iviewer_common iviewer_button"}).bind("mousedown touchstart",function(){me.fit(this);return false}).appendTo(this.container);this.zoom_object=$("<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",
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function(){me.angle(90);return false}).appendTo(this.container);this.update_status()}});$.ui.iviewer.ImageObject=function(do_anim){this._img=$("<img>").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)};(function(){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)};
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this.loaded=function(){return this._loaded};this.load=function(src,loaded,error){var self=this;loaded=loaded||jQuery.noop;this._loaded=false;var img=new Image;img.onload=function(){self._loaded=true;self._reset(this.width,this.height);self._img.removeAttr("width").removeAttr("height").removeAttr("style").css({position:"absolute",top:"0px",left:"0px",maxWidth:"none"});self._img[0].src=src;loaded()};img.onerror=error;setTimeout(function(){img.src=src},0);this.angle(0)};this._dimension=function(prefix,
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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]})};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",
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"height"),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});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});this.angle=setter(function(deg){var prevSwap=this._swapDimensions;this._angle=deg;this._swapDimensions=
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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*
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this.display_diff()/2,marginTop:ieTransforms[deg].marginTop*this.display_diff()/2})}},function(){return this._angle});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}}};this.toRealCoords=function(point){switch(this.angle()){case 0:return{x:this.x()+point.x,y:this.y()+
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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}}};this.object=setter(jQuery.noop,function(){return this._img});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,
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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;if(useIeTransforms&&swapDims){var ieh=
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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)}};this._finishAnimation=function(){this._img.stop(true,
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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);
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