158 lines
4.2 KiB
JavaScript
158 lines
4.2 KiB
JavaScript
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dojo.provide("dojox.html.metrics");
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(function(){
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var dhm = dojox.html.metrics;
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// derived from Morris John's emResized measurer
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dhm.getFontMeasurements = function(){
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// summary
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// Returns an object that has pixel equivilents of standard font size values.
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var heights = {
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'1em':0, '1ex':0, '100%':0, '12pt':0, '16px':0, 'xx-small':0, 'x-small':0,
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'small':0, 'medium':0, 'large':0, 'x-large':0, 'xx-large':0
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};
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if(dojo.isIE){
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// we do a font-size fix if and only if one isn't applied already.
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// NOTE: If someone set the fontSize on the HTML Element, this will kill it.
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dojo.doc.documentElement.style.fontSize="100%";
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}
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// set up the measuring node.
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var div=dojo.doc.createElement("div");
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var ds = div.style;
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ds.position="absolute";
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ds.left="-100px";
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ds.top="0";
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ds.width="30px";
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ds.height="1000em";
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ds.border="0";
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ds.margin="0";
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ds.padding="0";
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ds.outline="0";
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ds.lineHeight="1";
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ds.overflow="hidden";
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dojo.body().appendChild(div);
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// do the measurements.
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for(var p in heights){
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ds.fontSize = p;
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heights[p] = Math.round(div.offsetHeight * 12/16) * 16/12 / 1000;
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}
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dojo.body().removeChild(div);
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div = null;
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return heights; // object
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};
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var fontMeasurements = null;
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dhm.getCachedFontMeasurements = function(recalculate){
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if(recalculate || !fontMeasurements){
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fontMeasurements = dhm.getFontMeasurements();
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}
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return fontMeasurements;
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};
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var measuringNode = null, empty = {};
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dhm.getTextBox = function(/* String */ text, /* Object */ style, /* String? */ className){
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var m;
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if(!measuringNode){
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m = measuringNode = dojo.doc.createElement("div");
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m.style.position = "absolute";
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m.style.left = "-10000px";
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m.style.top = "0";
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dojo.body().appendChild(m);
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}else{
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m = measuringNode;
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}
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// reset styles
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m.className = "";
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m.style.border = "0";
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m.style.margin = "0";
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m.style.padding = "0";
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m.style.outline = "0";
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// set new style
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if(arguments.length > 1 && style){
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for(var i in style){
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if(i in empty){ continue; }
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m.style[i] = style[i];
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}
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}
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// set classes
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if(arguments.length > 2 && className){
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m.className = className;
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}
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// take a measure
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m.innerHTML = text;
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return dojo.marginBox(m);
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};
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// determine the scrollbar sizes on load.
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var scroll={ w:16, h:16 };
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dhm.getScrollbar=function(){ return { w:scroll.w, h:scroll.h }; };
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dhm._fontResizeNode = null;
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dhm.initOnFontResize = function(interval){
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var f = dhm._fontResizeNode = dojo.doc.createElement("iframe");
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var fs = f.style;
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fs.position = "absolute";
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fs.width = "5em";
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fs.height = "10em";
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fs.top = "-10000px";
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if(dojo.isIE){
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f.onreadystatechange = function(){
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if(f.contentWindow.document.readyState == "complete"){
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f.onresize = f.contentWindow.parent[dojox._scopeName].html.metrics._fontresize;
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}
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};
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}else{
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f.onload = function(){
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f.contentWindow.onresize = f.contentWindow.parent[dojox._scopeName].html.metrics._fontresize;
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};
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}
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//The script tag is to work around a known firebug race condition. See comments in bug #9046
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f.setAttribute("src", "javascript:'<html><head><script>if(\"loadFirebugConsole\" in window){window.loadFirebugConsole();}</script></head><body></body></html>'");
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dojo.body().appendChild(f);
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dhm.initOnFontResize = function(){};
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};
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dhm.onFontResize = function(){};
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dhm._fontresize = function(){
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dhm.onFontResize();
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}
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dojo.addOnUnload(function(){
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// destroy our font resize iframe if we have one
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var f = dhm._fontResizeNode;
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if(f){
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if(dojo.isIE && f.onresize){
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f.onresize = null;
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}else if(f.contentWindow && f.contentWindow.onresize){
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f.contentWindow.onresize = null;
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}
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dhm._fontResizeNode = null;
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}
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});
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dojo.addOnLoad(function(){
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// getScrollbar metrics node
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try{
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var n=dojo.doc.createElement("div");
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n.style.cssText = "top:0;left:0;width:100px;height:100px;overflow:scroll;position:absolute;visibility:hidden;";
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dojo.body().appendChild(n);
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scroll.w = n.offsetWidth - n.clientWidth;
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scroll.h = n.offsetHeight - n.clientHeight;
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dojo.body().removeChild(n);
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//console.log("Scroll bar dimensions: ", scroll);
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delete n;
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}catch(e){}
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// text size poll setup
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if("fontSizeWatch" in dojo.config && !!dojo.config.fontSizeWatch){
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dhm.initOnFontResize();
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}
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});
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})();
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