mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
380 lines
10 KiB
JavaScript
380 lines
10 KiB
JavaScript
"use strict";
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var _html2canvas = {},
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previousElement,
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computedCSS,
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html2canvas;
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function h2clog(a) {
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if (_html2canvas.logging && window.console && window.console.log) {
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window.console.log(a);
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}
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}
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_html2canvas.Util = {};
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_html2canvas.Util.trimText = (function(isNative){
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return function(input){
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if(isNative) { return isNative.apply( input ); }
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else { return ((input || '') + '').replace( /^\s+|\s+$/g , '' ); }
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};
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})( String.prototype.trim );
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_html2canvas.Util.parseBackgroundImage = function (value) {
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var whitespace = ' \r\n\t',
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method, definition, prefix, prefix_i, block, results = [],
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c, mode = 0, numParen = 0, quote, args;
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var appendResult = function(){
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if(method) {
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if(definition.substr( 0, 1 ) === '"') {
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definition = definition.substr( 1, definition.length - 2 );
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}
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if(definition) {
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args.push(definition);
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}
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if(method.substr( 0, 1 ) === '-' &&
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(prefix_i = method.indexOf( '-', 1 ) + 1) > 0) {
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prefix = method.substr( 0, prefix_i);
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method = method.substr( prefix_i );
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}
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results.push({
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prefix: prefix,
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method: method.toLowerCase(),
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value: block,
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args: args
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});
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}
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args = []; //for some odd reason, setting .length = 0 didn't work in safari
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method =
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prefix =
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definition =
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block = '';
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};
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appendResult();
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for(var i = 0, ii = value.length; i<ii; i++) {
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c = value[i];
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if(mode === 0 && whitespace.indexOf( c ) > -1){
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continue;
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}
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switch(c) {
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case '"':
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if(!quote) {
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quote = c;
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}
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else if(quote === c) {
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quote = null;
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}
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break;
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case '(':
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if(quote) { break; }
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else if(mode === 0) {
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mode = 1;
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block += c;
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continue;
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} else {
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numParen++;
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}
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break;
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case ')':
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if(quote) { break; }
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else if(mode === 1) {
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if(numParen === 0) {
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mode = 0;
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block += c;
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appendResult();
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continue;
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} else {
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numParen--;
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}
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}
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break;
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case ',':
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if(quote) { break; }
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else if(mode === 0) {
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appendResult();
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continue;
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}
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else if (mode === 1) {
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if(numParen === 0 && !method.match(/^url$/i)) {
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args.push(definition);
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definition = '';
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block += c;
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continue;
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}
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}
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break;
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}
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block += c;
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if(mode === 0) { method += c; }
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else { definition += c; }
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}
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appendResult();
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return results;
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};
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_html2canvas.Util.Bounds = function getBounds (el) {
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var clientRect,
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bounds = {};
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if (el.getBoundingClientRect){
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clientRect = el.getBoundingClientRect();
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// TODO add scroll position to bounds, so no scrolling of window necessary
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bounds.top = clientRect.top;
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bounds.bottom = clientRect.bottom || (clientRect.top + clientRect.height);
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bounds.left = clientRect.left;
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// older IE doesn't have width/height, but top/bottom instead
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bounds.width = clientRect.width || (clientRect.right - clientRect.left);
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bounds.height = clientRect.height || (clientRect.bottom - clientRect.top);
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return bounds;
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}
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};
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_html2canvas.Util.getCSS = function (el, attribute, index) {
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// return $(el).css(attribute);
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var val,
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isBackgroundSizePosition = attribute.match( /^background(Size|Position)$/ );
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function toPX( attribute, val ) {
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var rsLeft = el.runtimeStyle && el.runtimeStyle[ attribute ],
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left,
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style = el.style;
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// Check if we are not dealing with pixels, (Opera has issues with this)
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// Ported from jQuery css.js
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// From the awesome hack by Dean Edwards
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// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
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// If we're not dealing with a regular pixel number
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// but a number that has a weird ending, we need to convert it to pixels
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if ( !/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test( val ) && /^-?\d/.test( val ) ) {
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// Remember the original values
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left = style.left;
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// Put in the new values to get a computed value out
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if ( rsLeft ) {
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el.runtimeStyle.left = el.currentStyle.left;
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}
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style.left = attribute === "fontSize" ? "1em" : (val || 0);
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val = style.pixelLeft + "px";
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// Revert the changed values
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style.left = left;
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if ( rsLeft ) {
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el.runtimeStyle.left = rsLeft;
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}
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}
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if (!/^(thin|medium|thick)$/i.test( val )) {
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return Math.round(parseFloat( val )) + "px";
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}
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return val;
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}
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if (previousElement !== el) {
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computedCSS = document.defaultView.getComputedStyle(el, null);
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}
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val = computedCSS[attribute];
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if (isBackgroundSizePosition) {
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val = (val || '').split( ',' );
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val = val[index || 0] || val[0] || 'auto';
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val = _html2canvas.Util.trimText(val).split(' ');
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if(attribute === 'backgroundSize' && (!val[ 0 ] || val[ 0 ].match( /cover|contain|auto/ ))) {
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//these values will be handled in the parent function
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} else {
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val[ 0 ] = ( val[ 0 ].indexOf( "%" ) === -1 ) ? toPX( attribute + "X", val[ 0 ] ) : val[ 0 ];
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if(val[ 1 ] === undefined) {
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if(attribute === 'backgroundSize') {
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val[ 1 ] = 'auto';
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return val;
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}
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else {
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// IE 9 doesn't return double digit always
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val[ 1 ] = val[ 0 ];
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}
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}
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val[ 1 ] = ( val[ 1 ].indexOf( "%" ) === -1 ) ? toPX( attribute + "Y", val[ 1 ] ) : val[ 1 ];
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}
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} else if ( /border(Top|Bottom)(Left|Right)Radius/.test( attribute) ) {
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var arr = val.split(" ");
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if ( arr.length <= 1 ) {
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arr[ 1 ] = arr[ 0 ];
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}
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arr[ 0 ] = parseInt( arr[ 0 ], 10 );
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arr[ 1 ] = parseInt( arr[ 1 ], 10 );
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val = arr;
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}
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return val;
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};
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_html2canvas.Util.resizeBounds = function( current_width, current_height, target_width, target_height, stretch_mode ){
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var target_ratio = target_width / target_height,
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current_ratio = current_width / current_height,
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output_width, output_height;
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if(!stretch_mode || stretch_mode === 'auto') {
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output_width = target_width;
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output_height = target_height;
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} else {
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if(target_ratio < current_ratio ^ stretch_mode === 'contain') {
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output_height = target_height;
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output_width = target_height * current_ratio;
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} else {
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output_width = target_width;
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output_height = target_width / current_ratio;
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}
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}
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return { width: output_width, height: output_height };
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};
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function backgroundBoundsFactory( prop, el, bounds, image, imageIndex, backgroundSize ) {
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var bgposition = _html2canvas.Util.getCSS( el, prop, imageIndex ) ,
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topPos,
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left,
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percentage,
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val;
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if (bgposition.length === 1){
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val = bgposition[0];
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bgposition = [];
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bgposition[0] = val;
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bgposition[1] = val;
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}
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if (bgposition[0].toString().indexOf("%") !== -1){
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percentage = (parseFloat(bgposition[0])/100);
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left = bounds.width * percentage;
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if(prop !== 'backgroundSize') {
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left -= (backgroundSize || image).width*percentage;
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}
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} else {
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if(prop === 'backgroundSize') {
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if(bgposition[0] === 'auto') {
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left = image.width;
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} else {
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if(bgposition[0].match(/contain|cover/)) {
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var resized = _html2canvas.Util.resizeBounds( image.width, image.height, bounds.width, bounds.height, bgposition[0] );
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left = resized.width;
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topPos = resized.height;
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} else {
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left = parseInt (bgposition[0], 10 );
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}
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}
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} else {
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left = parseInt( bgposition[0], 10 );
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}
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}
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if(bgposition[1] === 'auto') {
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topPos = left / image.width * image.height;
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} else if (bgposition[1].toString().indexOf("%") !== -1){
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percentage = (parseFloat(bgposition[1])/100);
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topPos = bounds.height * percentage;
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if(prop !== 'backgroundSize') {
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topPos -= (backgroundSize || image).height * percentage;
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}
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} else {
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topPos = parseInt(bgposition[1],10);
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}
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return [left, topPos];
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}
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_html2canvas.Util.BackgroundPosition = function( el, bounds, image, imageIndex, backgroundSize ) {
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var result = backgroundBoundsFactory( 'backgroundPosition', el, bounds, image, imageIndex, backgroundSize );
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return { left: result[0], top: result[1] };
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};
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_html2canvas.Util.BackgroundSize = function( el, bounds, image, imageIndex ) {
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var result = backgroundBoundsFactory( 'backgroundSize', el, bounds, image, imageIndex );
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return { width: result[0], height: result[1] };
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};
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_html2canvas.Util.Extend = function (options, defaults) {
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for (var key in options) {
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if (options.hasOwnProperty(key)) {
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defaults[key] = options[key];
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}
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}
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return defaults;
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};
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/*
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* Derived from jQuery.contents()
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* Copyright 2010, John Resig
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* Dual licensed under the MIT or GPL Version 2 licenses.
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* http://jquery.org/license
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*/
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_html2canvas.Util.Children = function( elem ) {
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var children;
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try {
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children = (elem.nodeName && elem.nodeName.toUpperCase() === "IFRAME") ?
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elem.contentDocument || elem.contentWindow.document : (function( array ){
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var ret = [];
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if ( array !== null ) {
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(function( first, second ) {
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var i = first.length,
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j = 0;
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if ( typeof second.length === "number" ) {
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for ( var l = second.length; j < l; j++ ) {
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first[ i++ ] = second[ j ];
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}
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} else {
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while ( second[j] !== undefined ) {
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first[ i++ ] = second[ j++ ];
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}
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}
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first.length = i;
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return first;
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})( ret, array );
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}
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return ret;
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})( elem.childNodes );
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} catch (ex) {
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h2clog("html2canvas.Util.Children failed with exception: " + ex.message);
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children = [];
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}
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return children;
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};
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