467 lines
14 KiB
JavaScript
467 lines
14 KiB
JavaScript
/*
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* jQuery PanZoom Plugin
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* Pan and zoom an image within a parent div.
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*
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* version: 0.9.0
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* @requires jQuery v1.4.2 or later (earlier probably work, but untested so far)
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*
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* Copyright (c) 2011 Ben Lumley
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* Examples and documentation at: https://github.com/benlumley/jQuery-PanZoom
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*
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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/licenses/gpl.html
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*/
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(function( $ ){
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$.fn.panZoom = function(method) {
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if ( methods[method] ) {
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return methods[ method ].apply( this, Array.prototype.slice.call( arguments, 1 ));
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} else if ( typeof method === 'object' || ! method ) {
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return methods.init.apply( this, arguments );
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} else {
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$.error( 'Method ' + method + ' does not exist' );
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}
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};
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$.fn.panZoom.defaults = {
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zoomIn : false,
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zoomOut : false,
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panUp : false,
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panDown : false,
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panLeft : false,
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panRight : false,
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fit : false,
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out_x1 : false,
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out_y1 : false,
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out_x2 : false,
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out_y2 : false,
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min_width : 20,
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min_height : 20,
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zoom_step : 3,
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pan_step : 3,
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debug : false,
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directedit : false,
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aspect : true,
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factor : 1,
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animate : true,
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animate_duration : 200,
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animate_easing : 'linear',
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double_click : true,
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mousewheel : true,
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mousewheel_delta : 1,
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draggable : true,
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clickandhold : true
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};
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var settings = {}
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var methods = {
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'init': function (options) {
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$.extend(settings, $.fn.panZoom.defaults, options);
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setupCSS.apply(this);
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setupData.apply(this);
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setupBindings.apply(this);
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methods.readPosition.apply(this);
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},
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'destroy': function () {
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$(window).unbind('.panZoom');
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this.removeData('panZoom');
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},
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'loadImage': function () {
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var data = this.data('panZoom');
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loadTargetDimensions.apply(this);
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methods.updatePosition.apply(this);
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if (data.last_image != null && data.last_image != this.attr('src')) {
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methods.fit.apply(this);
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}
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data.last_image = this.attr('src');
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data.loaded = true;
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},
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'readPosition': function () {
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var data = this.data('panZoom');
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if (settings.out_x1) { data.position.x1 = settings.out_x1.val()*settings.factor }
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if (settings.out_y1) { data.position.y1 = settings.out_y1.val()*settings.factor }
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if (settings.out_x2) { data.position.x2 = settings.out_x2.val()*settings.factor }
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if (settings.out_y2) { data.position.y2 = settings.out_y2.val()*settings.factor }
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methods.updatePosition.apply(this);
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},
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'updatePosition': function() {
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validatePosition.apply(this);
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writePosition.apply(this);
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applyPosition.apply(this);
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},
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'fit': function () {
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var data = this.data('panZoom');
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data.position.x1 = 0;
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data.position.y1 = 0;
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data.position.x2 = data.viewport_dimensions.x;
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data.position.y2 = data.viewport_dimensions.y;
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methods.updatePosition.apply(this);
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},
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'zoomIn': function (steps) {
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var data = this.data('panZoom');
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if (typeof(steps) == 'undefined') {
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var steps = getStepDimensions.apply(this);
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}
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console.debug(data.position);
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console.debug(data.viewport_dimensions);
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data.position.x1 = data.position.x1*1 - steps.zoom.x;
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data.position.x2 = data.position.x2*1 + steps.zoom.x;
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data.position.y1 = data.position.y1*1 - steps.zoom.y;
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data.position.y2 = data.position.y2*1 + steps.zoom.y;
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methods.updatePosition.apply(this);
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},
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'zoomOut': function (steps) {
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var data = this.data('panZoom');
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if (typeof(steps) == 'undefined') {
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var steps = getStepDimensions.apply(this);
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}
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data.position.x1 = data.position.x1*1 + steps.zoom.x;
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data.position.x2 = data.position.x2*1 - steps.zoom.x;
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data.position.y1 = data.position.y1*1 + steps.zoom.y;
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data.position.y2 = data.position.y2*1 - steps.zoom.y;
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methods.updatePosition.apply(this);
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},
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'panUp': function () {
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var data = this.data('panZoom');
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var steps = getStepDimensions.apply(this);
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data.position.y1 -= steps.pan.y;
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data.position.y2 -= steps.pan.y;
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methods.updatePosition.apply(this);
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},
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'panDown': function () {
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var data = this.data('panZoom');
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var steps = getStepDimensions.apply(this);
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data.position.y1 = data.position.y1*1 + steps.pan.y;
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data.position.y2 = data.position.y2*1 + steps.pan.y;
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methods.updatePosition.apply(this);
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},
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'panLeft': function () {
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var data = this.data('panZoom');
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var steps = getStepDimensions.apply(this);
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data.position.x1 -= steps.pan.x;
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data.position.x2 -= steps.pan.x;
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methods.updatePosition.apply(this);
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},
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'panRight': function () {
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var data = this.data('panZoom');
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var steps = getStepDimensions.apply(this);
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data.position.x1 = data.position.x1*1 + steps.pan.x;
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data.position.x2 = data.position.x2*1 + steps.pan.x;
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methods.updatePosition.apply(this);
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},
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'mouseWheel': function (delta) {
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// first calculate how much to zoom in/out
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var steps = getStepDimensions.apply(this);
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steps.zoom.x = steps.zoom.x * (Math.abs(delta) / settings.mousewheel_delta);
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steps.zoom.y = steps.zoom.y * (Math.abs(delta) / settings.mousewheel_delta);
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// then do it
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if (delta > 0) {
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methods.zoomIn.apply(this, [steps]);
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} else if (delta < 0) {
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methods.zoomOut.apply(this, [steps]);
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}
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},
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'dragComplete': function() {
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var data = this.data('panZoom');
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data.position.x1 = this.position().left;
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data.position.y1 = this.position().top;
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data.position.x2 = this.position().left*1 + this.width();
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data.position.y2 = this.position().top*1 + this.height();
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methods.updatePosition.apply(this);
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},
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'mouseDown': function (action) {
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methods[action].apply(this);
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if (settings.clickandhold) {
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var data = this.data('panZoom');
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methods.mouseUp.apply(this);
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data.mousedown_interval = window.setInterval(function (that, action) {
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that.panZoom(action);
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}, settings.animate_duration, this, action);
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}
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},
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'mouseUp': function() {
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var data = this.data('panZoom');
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window.clearInterval(data.mousedown_interval);
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}
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}
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function setupBindings() {
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eventData = { target: this }
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// bind up controls
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if (settings.zoomIn) {
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settings.zoomIn.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'zoomIn');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.zoomOut) {
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settings.zoomOut.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'zoomOut');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.panUp) {
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settings.panUp.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'panUp');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.panDown) {
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settings.panDown.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'panDown');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.panLeft) {
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settings.panLeft.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'panLeft');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.panRight) {
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settings.panRight.bind('mousedown.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseDown', 'panRight');
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}).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
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event.preventDefault(); event.data.target.panZoom('mouseUp');
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});
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}
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if (settings.fit) { settings.fit.bind('click.panZoom', eventData, function(event) { event.preventDefault(); event.data.target.panZoom('fit'); } ); }
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// double click
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if (settings.double_click) {
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this.bind('dblclick.panZoom', eventData, function(event, delta) { event.data.target.panZoom('zoomIn') } );
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}
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// mousewheel
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if (settings.mousewheel && typeof(this.mousewheel) == 'function') {
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this.parent().mousewheel(function(event, delta) { event.preventDefault(); $(this).find('img').panZoom('mouseWheel', delta) } );
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} else if (settings.mousewheel) {
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alert('Mousewheel requires mousewheel from jQuery tools - please include jQuery tools or disable mousewheel to remove this warning.')
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}
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// direct form input
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if (settings.directedit) {
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$(settings.out_x1).add(settings.out_y1).add(settings.out_x2).add(settings.out_y2).bind('change.panZoom blur.panZoom', eventData, function(event) { event.data.target.panZoom('readPosition') } );
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}
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if (settings.draggable && typeof(this.draggable) == 'function') {
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this.draggable({
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stop: function () { $(this).panZoom('dragComplete'); }
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});
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} else if (settings.draggable) {
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alert('Draggable requires jQuery UI - please include jQuery UI or disable draggable to remove this warning.')
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}
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// image load
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$(this).bind('load.panZoom', eventData, function (event) { event.data.target.panZoom('loadImage') })
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}
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function setupData() {
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this.data('panZoom', {
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target_element: this,
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target_dimensions: { x: null, y: null },
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viewport_element: this.parent(),
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viewport_dimensions: { x: this.parent().width(), y: this.parent().height() },
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position: { x1: null, y1: null, x2: null, y2: null },
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last_image: null,
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loaded: false,
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mousewheel_delta: 0,
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mousedown_interval: false
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});
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if (settings.debug) {
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console.log(this.data('panZoom'));
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}
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}
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function setupCSS() {
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if (this.parent().css('position') == 'static') {
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this.parent().css('position', 'relative');
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}
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this.css({
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'position': 'absolute',
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'top': 0,
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'left': 0
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});
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if (settings.draggable) {
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this.css({
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'cursor': 'move'
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});
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}
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}
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function validatePosition() {
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var data = this.data('panZoom');
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// if dimensions are too small...
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if ( data.position.x2 - data.position.x1 < settings.min_width/settings.factor || data.position.y2 - data.position.y1 < settings.min_height/settings.factor ) {
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// and second co-ords are zero (IE: no dims set), fit image
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if (data.position.x2 == 0 || data.position.y2 == 0) {
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methods.fit.apply(this);
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}
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// otherwise, backout a bit
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else {
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if (data.position.x2 - data.position.x1 < settings.min_width/settings.factor) {
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data.position.x2 = data.position.x1*1+settings.min_width/settings.factor;
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}
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if (data.position.y2 - data.position.y1 < settings.min_height/settings.factor) {
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data.position.y2 = data.position.y1*1+settings.min_height/settings.factor;
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}
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}
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}
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if (settings.aspect) {
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target = data.target_dimensions.ratio;
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current = getCurrentAspectRatio.apply(this)
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if (current > target) {
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new_width = getHeight.apply(this) * target;
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diff = getWidth.apply(this) - new_width;
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data.position.x1 = data.position.x1*1 + (diff/2);
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data.position.x2 = data.position.x2*1 - (diff/2);
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} else if (current < target) {
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new_height = getWidth.apply(this) / target;
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diff = getHeight.apply(this) - new_height;
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data.position.y1 = data.position.y1*1 + (diff/2);
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data.position.y2 = data.position.y2*1 - (diff/2);
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}
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}
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}
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function applyPosition() {
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var data = this.data('panZoom');
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width = getWidth.apply(this);
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height = getHeight.apply(this);
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left_offset = getLeftOffset.apply(this);
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top_offset = getTopOffset.apply(this);
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properties = {
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'top': Math.round(top_offset),
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'left': Math.round(left_offset),
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'width': Math.round(width),
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'height': Math.round(height)
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}
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if (data.loaded && settings.animate) {
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applyAnimate.apply(this, [ properties ]);
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} else {
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applyCSS.apply(this, [ properties ]);
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}
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if (settings.debug) {
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console.log('--');
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console.log('width:' + width);
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console.log('height:' + height);
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console.log('left:' + left_offset);
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console.log('top:' + top_offset);
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}
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}
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function applyCSS() {
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this.css( properties );
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}
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function applyAnimate() {
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this.stop().animate( properties , settings.animate_duration, settings.animate_easing);
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}
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function getWidth() {
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var data = this.data('panZoom');
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width = (data.position.x2 - data.position.x1);
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return width;
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}
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function getLeftOffset() {
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var data = this.data('panZoom');
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return data.position.x1;
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}
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function getHeight() {
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var data = this.data('panZoom');
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height = (data.position.y2 - data.position.y1);
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return height;
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}
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function getTopOffset() {
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var data = this.data('panZoom');
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top_offset = data.position.y1;
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return top_offset;
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}
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function getCurrentAspectRatio() {
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return (getWidth.apply(this) / getHeight.apply(this));
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}
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function writePosition() {
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var data = this.data('panZoom');
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if (settings.out_x1) { settings.out_x1.val(Math.round(data.position.x1 / settings.factor)) }
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if (settings.out_y1) { settings.out_y1.val(Math.round(data.position.y1 / settings.factor)) }
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if (settings.out_x2) { settings.out_x2.val(Math.round(data.position.x2 / settings.factor)) }
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if (settings.out_y2) { settings.out_y2.val(Math.round(data.position.y2 / settings.factor)) }
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}
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function getStepDimensions() {
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var data = this.data('panZoom');
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ret = {
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zoom: {
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x: (settings.zoom_step/100 * data.viewport_dimensions.x),
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y: (settings.zoom_step/100 * data.viewport_dimensions.y)
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},
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pan: {
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x: (settings.pan_step/100 * data.viewport_dimensions.x),
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y: (settings.pan_step/100 * data.viewport_dimensions.y)
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}
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}
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return ret;
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}
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function loadTargetDimensions() {
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var data = this.data('panZoom');
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var img = document.createElement('img');
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img.src = this.attr('src');
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img.id = "jqpz-temp";
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$('body').append(img);
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data.target_dimensions.x = $('#jqpz-temp').width();
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data.target_dimensions.y = $('#jqpz-temp').height();
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$('#jqpz-temp').remove();
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data.target_dimensions.ratio = data.target_dimensions.x / data.target_dimensions.y;
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}
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})( jQuery ); |