123 lines
4.1 KiB
JavaScript
123 lines
4.1 KiB
JavaScript
//>>built
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define("dijit/form/_ExpandingTextAreaMixin", [
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"dojo/_base/declare", // declare
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"dojo/dom-construct", // domConstruct.create
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"dojo/_base/lang", // lang.hitch
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"dojo/_base/window" // win.body
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], function(declare, domConstruct, lang, win){
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// module:
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// dijit/form/_ExpandingTextAreaMixin
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// summary:
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// Mixin for textarea widgets to add auto-expanding capability
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// feature detection
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var needsHelpShrinking;
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return declare("dijit.form._ExpandingTextAreaMixin", null, {
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// summary:
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// Mixin for textarea widgets to add auto-expanding capability
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_setValueAttr: function(){
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this.inherited(arguments);
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this.resize();
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},
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postCreate: function(){
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this.inherited(arguments);
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var textarea = this.textbox;
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if(needsHelpShrinking == undefined){
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var te = domConstruct.create('textarea', {rows:"5", cols:"20", value: ' ', style: {zoom:1, overflow:'hidden', visibility:'hidden', position:'absolute', border:"0px solid black", padding:"0px"}}, win.body(), "last");
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needsHelpShrinking = te.scrollHeight >= te.clientHeight;
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win.body().removeChild(te);
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}
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this.connect(textarea, "onscroll", "_resizeLater");
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this.connect(textarea, "onresize", "_resizeLater");
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this.connect(textarea, "onfocus", "_resizeLater");
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textarea.style.overflowY = "hidden";
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this._estimateHeight();
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this._resizeLater();
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},
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_onInput: function(e){
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this.inherited(arguments);
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this.resize();
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},
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_estimateHeight: function(){
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// summary:
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// Approximate the height when the textarea is invisible with the number of lines in the text.
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// Fails when someone calls setValue with a long wrapping line, but the layout fixes itself when the user clicks inside so . . .
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// In IE, the resize event is supposed to fire when the textarea becomes visible again and that will correct the size automatically.
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//
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var textarea = this.textbox;
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textarea.style.height = "auto";
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// #rows = #newlines+1
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// Note: on Moz, the following #rows appears to be 1 too many.
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// Actually, Moz is reserving room for the scrollbar.
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// If you increase the font size, this behavior becomes readily apparent as the last line gets cut off without the +1.
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textarea.rows = (textarea.value.match(/\n/g) || []).length + 2;
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},
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_resizeLater: function(){
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setTimeout(lang.hitch(this, "resize"), 0);
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},
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resize: function(){
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// summary:
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// Resizes the textarea vertically (should be called after a style/value change)
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function textareaScrollHeight(){
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var empty = false;
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if(textarea.value === ''){
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textarea.value = ' ';
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empty = true;
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}
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var sh = textarea.scrollHeight;
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if(empty){ textarea.value = ''; }
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return sh;
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}
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var textarea = this.textbox;
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if(textarea.style.overflowY == "hidden"){ textarea.scrollTop = 0; }
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if(this.resizeTimer){ clearTimeout(this.resizeTimer); }
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this.resizeTimer = null;
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if(this.busyResizing){ return; }
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this.busyResizing = true;
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if(textareaScrollHeight() || textarea.offsetHeight){
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var currentHeight = textarea.style.height;
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if(!(/px/.test(currentHeight))){
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currentHeight = textareaScrollHeight();
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textarea.rows = 1;
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textarea.style.height = currentHeight + "px";
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}
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var newH = Math.max(parseInt(currentHeight) - textarea.clientHeight, 0) + textareaScrollHeight();
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var newHpx = newH + "px";
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if(newHpx != textarea.style.height){
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textarea.rows = 1;
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textarea.style.height = newHpx;
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}
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if(needsHelpShrinking){
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var scrollHeight = textareaScrollHeight();
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textarea.style.height = "auto";
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if(textareaScrollHeight() < scrollHeight){ // scrollHeight can shrink so now try a larger value
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newHpx = newH - scrollHeight + textareaScrollHeight() + "px";
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}
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textarea.style.height = newHpx;
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}
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textarea.style.overflowY = textareaScrollHeight() > textarea.clientHeight ? "auto" : "hidden";
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}else{
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// hidden content of unknown size
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this._estimateHeight();
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}
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this.busyResizing = false;
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},
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destroy: function(){
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if(this.resizeTimer){ clearTimeout(this.resizeTimer); }
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if(this.shrinkTimer){ clearTimeout(this.shrinkTimer); }
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this.inherited(arguments);
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}
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});
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});
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