define([
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"dojo/_base/declare", // declare
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"dojo/dom-construct", // domConstruct.create
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"dojo/has",
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"dojo/_base/lang", // lang.hitch
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"dojo/on",
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"dojo/_base/window", // win.body
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"../Viewport"
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], function(declare, domConstruct, has, lang, on, win, Viewport){
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// module:
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// dijit/form/_ExpandingTextAreaMixin
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// feature detection, true for mozilla and webkit
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has.add("textarea-needs-help-shrinking", function(){
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var body = win.body(), // note: if multiple documents exist, doesn't matter which one we use
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te = domConstruct.create('textarea', {
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rows:"5",
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cols:"20",
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value: ' ',
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style: {zoom:1, fontSize:"12px", height:"96px", overflow:'hidden', visibility:'hidden', position:'absolute', border:"5px solid white", margin:"0", padding:"0", boxSizing: 'border-box', MsBoxSizing: 'border-box', WebkitBoxSizing: 'border-box', MozBoxSizing: 'border-box' }
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}, body, "last");
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var needsHelpShrinking = te.scrollHeight >= te.clientHeight;
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body.removeChild(te);
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return needsHelpShrinking;
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});
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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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textarea.style.overflowY = "hidden";
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this.own(on(textarea, "focus, resize", lang.hitch(this, "_resizeLater")));
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},
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startup: function(){
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this.inherited(arguments);
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this.own(Viewport.on("resize", lang.hitch(this, "_resizeLater")));
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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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// #rows = #newlines+1
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textarea.rows = (textarea.value.match(/\n/g) || []).length + 1;
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},
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_resizeLater: function(){
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this.defer("resize");
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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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var textarea = this.textbox;
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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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if(textarea.style.overflowY == "hidden"){ textarea.scrollTop = 0; }
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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 newH = textareaScrollHeight() + Math.max(textarea.offsetHeight - textarea.clientHeight, 0);
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var newHpx = newH + "px";
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if(newHpx != textarea.style.height){
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textarea.style.height = newHpx;
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textarea.rows = 1; // rows can act like a minHeight if not cleared
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}
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if(has("textarea-needs-help-shrinking")){
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var origScrollHeight = textareaScrollHeight(),
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newScrollHeight = origScrollHeight,
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origMinHeight = textarea.style.minHeight,
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decrement = 4, // not too fast, not too slow
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thisScrollHeight,
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origScrollTop = textarea.scrollTop;
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textarea.style.minHeight = newHpx; // maintain current height
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textarea.style.height = "auto"; // allow scrollHeight to change
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while(newH > 0){
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textarea.style.minHeight = Math.max(newH - decrement, 4) + "px";
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thisScrollHeight = textareaScrollHeight();
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var change = newScrollHeight - thisScrollHeight;
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newH -= change;
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if(change < decrement){
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break; // scrollHeight didn't shrink
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}
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newScrollHeight = thisScrollHeight;
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decrement <<= 1;
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}
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textarea.style.height = newH + "px";
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textarea.style.minHeight = origMinHeight;
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textarea.scrollTop = origScrollTop;
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}
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textarea.style.overflowY = textareaScrollHeight() > textarea.clientHeight ? "auto" : "hidden";
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if(textarea.style.overflowY == "hidden"){ textarea.scrollTop = 0; }
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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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});
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});
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