1170 lines
38 KiB
JavaScript
1170 lines
38 KiB
JavaScript
/*
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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 ) {
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//this code was taken from the https://github.com/furf/jquery-ui-touch-punch
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var mouseEvents = {
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touchstart: 'mousedown',
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touchmove: 'mousemove',
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touchend: 'mouseup'
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},
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gesturesSupport = 'ongesturestart' in document.createElement('div');
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/**
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* Convert a touch event to a mouse-like
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*/
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function makeMouseEvent (event) {
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var touch = event.originalEvent.changedTouches[0];
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return $.extend(event, {
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type: mouseEvents[event.type],
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which: 1,
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pageX: touch.pageX,
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pageY: touch.pageY,
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screenX: touch.screenX,
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screenY: touch.screenY,
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clientX: touch.clientX,
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clientY: touch.clientY,
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isTouchEvent: true
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});
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}
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var mouseProto = $.ui.mouse.prototype,
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_mouseInit = $.ui.mouse.prototype._mouseInit;
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mouseProto._mouseInit = function() {
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var self = this;
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self._touchActive = false;
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this.element.bind( 'touchstart.' + this.widgetName, function(event) {
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if (gesturesSupport && event.originalEvent.touches.length > 1) { return; }
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self._touchActive = true;
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return self._mouseDown(makeMouseEvent(event));
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})
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var self = this;
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// these delegates are required to keep context
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this._mouseMoveDelegate = function(event) {
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if (gesturesSupport && event.originalEvent.touches && event.originalEvent.touches.length > 1) { return; }
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if (self._touchActive) {
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return self._mouseMove(makeMouseEvent(event));
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}
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};
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this._mouseUpDelegate = function(event) {
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if (self._touchActive) {
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self._touchActive = false;
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return self._mouseUp(makeMouseEvent(event));
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}
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};
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$(document)
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.bind('touchmove.'+ this.widgetName, this._mouseMoveDelegate)
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.bind('touchend.' + this.widgetName, this._mouseUpDelegate);
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_mouseInit.apply(this);
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}
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/**
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* Simple implementation of jQuery like getters/setters
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* var val = something();
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* something(val);
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*/
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var setter = function(setter, getter) {
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return function(val) {
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if (arguments.length === 0) {
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return getter.apply(this);
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} else {
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setter.apply(this, arguments);
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}
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}
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};
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/**
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* Internet explorer rotates image relative left top corner, so we should
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* shift image when it's rotated.
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*/
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var ieTransforms = {
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'0': {
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marginLeft: 0,
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marginTop: 0,
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filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod="auto expand")'
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},
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'90': {
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marginLeft: -1,
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marginTop: 1,
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filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=-1, M21=1, M22=0, SizingMethod="auto expand")'
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},
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'180': {
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marginLeft: 0,
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marginTop: 0,
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filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=-1, M12=0, M21=0, M22=-1, SizingMethod="auto expand")'
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},
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'270': {
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marginLeft: -1,
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marginTop: 1,
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filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=1, M21=-1, M22=0, SizingMethod="auto expand")'
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}
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},
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// this test is the inversion of the css filters test from the modernizr project
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useIeTransforms = function() {
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var modElem = document.createElement('modernizr'),
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mStyle = modElem.style,
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omPrefixes = 'Webkit Moz O ms',
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domPrefixes = omPrefixes.toLowerCase().split(' '),
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props = ("transform" + ' ' + domPrefixes.join("Transform ") + "Transform").split(' ');
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for ( var i in props ) {
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var prop = props[i];
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if ( !$.contains(prop, "-") && mStyle[prop] !== undefined ) {
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return false;
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}
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}
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return true;
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}();
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$.widget( "ui.iviewer", $.ui.mouse, {
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widgetEventPrefix: "iviewer",
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options : {
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/**
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* start zoom value for image, not used now
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* may be equal to "fit" to fit image into container or scale in %
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**/
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zoom: "fit",
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/**
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* base value to scale image
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**/
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zoom_base: 100,
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/**
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* maximum zoom
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**/
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zoom_max: 800,
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/**
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* minimum zoom
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**/
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zoom_min: 25,
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/**
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* base of rate multiplier.
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* zoom is calculated by formula: zoom_base * zoom_delta^rate
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**/
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zoom_delta: 1.4,
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/**
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* whether the zoom should be animated.
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*/
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zoom_animation: true,
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/**
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* if true plugin doesn't add its own controls
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**/
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ui_disabled: false,
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/**
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* If false mousewheel will be disabled
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*/
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mousewheel: true,
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/**
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* if false, plugin doesn't bind resize event on window and this must
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* be handled manually
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**/
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update_on_resize: true,
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/**
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* event is triggered when zoom value is changed
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* @param int new zoom value
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* @return boolean if false zoom action is aborted
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**/
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onZoom: jQuery.noop,
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/**
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* event is triggered when zoom value is changed after image is set to the new dimensions
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* @param int new zoom value
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* @return boolean if false zoom action is aborted
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**/
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onAfterZoom: jQuery.noop,
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/**
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* event is fired on drag begin
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* @param object coords mouse coordinates on the image
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* @return boolean if false is returned, drag action is aborted
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**/
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onStartDrag: jQuery.noop,
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/**
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* event is fired on drag action
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* @param object coords mouse coordinates on the image
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**/
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onDrag: jQuery.noop,
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/**
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* event is fired on drag stop
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* @param object coords mouse coordinates on the image
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**/
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onStopDrag: jQuery.noop,
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/**
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* event is fired when mouse moves over image
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* @param object coords mouse coordinates on the image
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**/
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onMouseMove: jQuery.noop,
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/**
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* mouse click event
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* @param object coords mouse coordinates on the image
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**/
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onClick: jQuery.noop,
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/**
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* event is fired when image starts to load
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*/
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onStartLoad: null,
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/**
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* event is fired, when image is loaded and initially positioned
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*/
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onFinishLoad: null,
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/**
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* event is fired when image load error occurs
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*/
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onErrorLoad: null
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},
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_create: function() {
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var me = this;
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//drag variables
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this.dx = 0;
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this.dy = 0;
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/* object containing actual information about image
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* @img_object.object - jquery img object
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* @img_object.orig_{width|height} - original dimensions
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* @img_object.display_{width|height} - actual dimensions
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*/
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this.img_object = {};
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this.zoom_object = {}; //object to show zoom status
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this._angle = 0;
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this.current_zoom = this.options.zoom;
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if(this.options.src === null){
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return;
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}
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this.container = this.element;
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this._updateContainerInfo();
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//init container
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this.container.css("overflow","hidden");
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if (this.options.update_on_resize == true) {
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$(window).resize(function() {
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me.update();
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});
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}
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this.img_object = new $.ui.iviewer.ImageObject(this.options.zoom_animation);
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if (this.options.mousewheel) {
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this.container.bind('mousewheel.iviewer', function(ev, delta)
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{
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//this event is there instead of containing div, because
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//at opera it triggers many times on div
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var zoom = (delta > 0)?1:-1,
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container_offset = me.container.offset(),
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mouse_pos = {
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//jquery.mousewheel 3.1.0 uses strange MozMousePixelScroll event
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//which is not being fixed by jQuery.Event
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x: (ev.pageX || ev.originalEvent.pageX) - container_offset.left,
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y: (ev.pageY || ev.originalEvent.pageX) - container_offset.top
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};
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me.zoom_by(zoom, mouse_pos);
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return false;
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});
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if (gesturesSupport) {
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var gestureThrottle = +new Date();
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var originalScale, originalCenter;
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this.img_object.object()
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// .bind('gesturestart', function(ev) {
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.bind('touchstart', function(ev) {
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originalScale = me.current_zoom;
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var touches = ev.originalEvent.touches,
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container_offset;
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if (touches.length == 2) {
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container_offset = me.container.offset();
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originalCenter = {
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x: (touches[0].pageX + touches[1].pageX) / 2 - container_offset.left,
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y: (touches[0].pageY + touches[1].pageY) / 2 - container_offset.top
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};
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} else {
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originalCenter = null;
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}
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}).bind('gesturechange', function(ev) {
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//do not want to import throttle function from underscore
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var d = +new Date();
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if ((d - gestureThrottle) < 50) { return; }
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gestureThrottle = d;
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var zoom = originalScale * ev.originalEvent.scale;
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me.set_zoom(zoom, originalCenter);
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ev.preventDefault();
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}).bind('gestureend', function(ev) {
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originalCenter = null;
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});
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}
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}
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//init object
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this.img_object.object()
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//bind mouse events
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.click(function(e){return me._click(e)})
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.prependTo(this.container);
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this.container.bind('mousemove', function(ev) { me._handleMouseMove(ev); });
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this.loadImage(this.options.src);
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if(!this.options.ui_disabled)
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{
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this.createui();
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}
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this._mouseInit();
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},
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destroy: function() {
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$.Widget.prototype.destroy.call( this );
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this._mouseDestroy();
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this.img_object.object().remove();
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this.container.off('.iviewer');
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this.container.css('overflow', ''); //cleanup styles on destroy
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},
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_updateContainerInfo: function()
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{
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this.options.height = this.container.height();
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this.options.width = this.container.width();
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},
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update: function()
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{
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this._updateContainerInfo()
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this.setCoords(this.img_object.x(), this.img_object.y());
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},
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loadImage: function( src )
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{
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this.current_zoom = this.options.zoom;
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var me = this;
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this._trigger('onStartLoad', 0, src);
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this.container.addClass("iviewer_loading");
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this.img_object.load(src, function() {
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me._imageLoaded(src);
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}, function() {
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me._trigger("onErrorLoad", 0, src);
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});
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},
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_imageLoaded: function(src) {
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this.container.removeClass("iviewer_loading");
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this.container.addClass("iviewer_cursor");
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if(this.options.zoom == "fit"){
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this.fit(true);
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}
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else {
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this.set_zoom(this.options.zoom, true);
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}
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this._trigger('onFinishLoad', 0, src);
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},
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/**
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* fits image in the container
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*
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* @param {boolean} skip_animation
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**/
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fit: function(skip_animation)
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{
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var aspect_ratio = this.img_object.orig_width() / this.img_object.orig_height();
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var window_ratio = this.options.width / this.options.height;
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var choose_left = (aspect_ratio > window_ratio);
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var new_zoom = 0;
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if(choose_left){
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new_zoom = this.options.width / this.img_object.orig_width() * 100;
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}
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else {
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new_zoom = this.options.height / this.img_object.orig_height() * 100;
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}
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this.set_zoom(new_zoom, skip_animation);
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},
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/**
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* center image in container
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**/
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center: function()
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{
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this.setCoords(-Math.round((this.img_object.display_width() - this.options.width)/2),
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-Math.round((this.img_object.display_height() - this.options.height)/2));
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},
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/**
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* move a point in container to the center of display area
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* @param x a point in container
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* @param y a point in container
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**/
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moveTo: function(x, y)
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{
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var dx = x-Math.round(this.options.width/2);
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var dy = y-Math.round(this.options.height/2);
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var new_x = this.img_object.x() - dx;
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var new_y = this.img_object.y() - dy;
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this.setCoords(new_x, new_y);
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},
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/**
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* Get container offset object.
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*/
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getContainerOffset: function() {
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return jQuery.extend({}, this.container.offset());
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},
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/**
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* set coordinates of upper left corner of image object
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**/
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setCoords: function(x,y)
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{
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//do nothing while image is being loaded
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if(!this.img_object.loaded()) { return; }
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var coords = this._correctCoords(x,y);
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this.img_object.x(coords.x);
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this.img_object.y(coords.y);
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},
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_correctCoords: function( x, y )
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{
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x = parseInt(x, 10);
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y = parseInt(y, 10);
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//check new coordinates to be correct (to be in rect)
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if(y > 0){
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y = 0;
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}
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if(x > 0){
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x = 0;
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}
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if(y + this.img_object.display_height() < this.options.height){
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y = this.options.height - this.img_object.display_height();
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}
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if(x + this.img_object.display_width() < this.options.width){
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x = this.options.width - this.img_object.display_width();
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}
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if(this.img_object.display_width() <= this.options.width){
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x = -(this.img_object.display_width() - this.options.width)/2;
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}
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if(this.img_object.display_height() <= this.options.height){
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y = -(this.img_object.display_height() - this.options.height)/2;
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}
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return { x: x, y:y };
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},
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/**
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* convert coordinates on the container to the coordinates on the image (in original size)
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*
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* @return object with fields x,y according to coordinates or false
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* if initial coords are not inside image
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**/
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containerToImage : function (x,y)
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{
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var coords = { x : x - this.img_object.x(),
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y : y - this.img_object.y()
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};
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coords = this.img_object.toOriginalCoords(coords);
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return { x : util.descaleValue(coords.x, this.current_zoom),
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y : util.descaleValue(coords.y, this.current_zoom)
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};
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},
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/**
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* convert coordinates on the image (in original size, and zero angle) to the coordinates on the container
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*
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* @return object with fields x,y according to coordinates
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**/
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imageToContainer : function (x,y)
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{
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var coords = {
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x : util.scaleValue(x, this.current_zoom),
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y : util.scaleValue(y, this.current_zoom)
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};
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return this.img_object.toRealCoords(coords);
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},
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/**
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* get mouse coordinates on the image
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* @param e - object containing pageX and pageY fields, e.g. mouse event object
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*
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* @return object with fields x,y according to coordinates or false
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* if initial coords are not inside image
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**/
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_getMouseCoords : function(e)
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{
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var containerOffset = this.container.offset();
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coords = this.containerToImage(e.pageX - containerOffset.left, e.pageY - containerOffset.top);
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return coords;
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},
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/**
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* set image scale to the new_zoom
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*
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* @param {number} new_zoom image scale in %
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* @param {boolean} skip_animation
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* @param {x: number, y: number} Coordinates of point the should not be moved on zoom. The default is the center of image.
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**/
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set_zoom: function(new_zoom, skip_animation, zoom_center)
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{
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if (this._trigger('onZoom', 0, new_zoom) == false) {
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return;
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}
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//do nothing while image is being loaded
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if(!this.img_object.loaded()) { return; }
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zoom_center = zoom_center || {
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x: Math.round(this.options.width/2),
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y: Math.round(this.options.height/2)
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}
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if(new_zoom < this.options.zoom_min)
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{
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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 );
|