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/*
Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dijit.form.Textarea"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dijit.form.Textarea"] = true;
dojo.provide("dijit.form.Textarea");
dojo.require("dijit.form.SimpleTextarea");
dojo.declare(
"dijit.form.Textarea",
dijit.form.SimpleTextarea,
{
// summary:
// A textarea widget that adjusts it's height according to the amount of data.
//
// description:
// A textarea that dynamically expands/contracts (changing it's height) as
// the user types, to display all the text without requiring a scroll bar.
//
// Takes nearly all the parameters (name, value, etc.) that a vanilla textarea takes.
// Rows is not supported since this widget adjusts the height.
//
// example:
// | <textarea dojoType="dijit.form.TextArea">...</textarea>
// TODO: for 2.0, rename this to ExpandingTextArea, and rename SimpleTextarea to Textarea
baseClass: "dijitTextBox dijitTextArea dijitExpandingTextArea",
// Override SimpleTextArea.cols to default to width:100%, for backward compatibility
cols: "",
_previousNewlines: 0,
_strictMode: (dojo.doc.compatMode != 'BackCompat'), // not the same as !dojo.isQuirks
_getHeight: function(textarea){
var newH = textarea.scrollHeight;
if(dojo.isIE){
newH += textarea.offsetHeight - textarea.clientHeight - ((dojo.isIE < 8 && this._strictMode) ? dojo._getPadBorderExtents(textarea).h : 0);
}else if(dojo.isMoz){
newH += textarea.offsetHeight - textarea.clientHeight; // creates room for horizontal scrollbar
}else if(dojo.isWebKit){
newH += dojo._getBorderExtents(textarea).h;
}else{ // Opera 9.6 (TODO: test if this is still needed)
newH += dojo._getPadBorderExtents(textarea).h;
}
return newH;
},
_estimateHeight: function(textarea){
// summary:
// Approximate the height when the textarea is invisible with the number of lines in the text.
// Fails when someone calls setValue with a long wrapping line, but the layout fixes itself when the user clicks inside so . . .
// In IE, the resize event is supposed to fire when the textarea becomes visible again and that will correct the size automatically.
//
textarea.style.maxHeight = "";
textarea.style.height = "auto";
// #rows = #newlines+1
// Note: on Moz, the following #rows appears to be 1 too many.
// Actually, Moz is reserving room for the scrollbar.
// If you increase the font size, this behavior becomes readily apparent as the last line gets cut off without the +1.
textarea.rows = (textarea.value.match(/\n/g) || []).length + 1;
},
_needsHelpShrinking: dojo.isMoz || dojo.isWebKit,
_onInput: function(){
// Override SimpleTextArea._onInput() to deal with height adjustment
this.inherited(arguments);
if(this._busyResizing){ return; }
this._busyResizing = true;
var textarea = this.textbox;
if(textarea.scrollHeight && textarea.offsetHeight && textarea.clientHeight){
var newH = this._getHeight(textarea) + "px";
if(textarea.style.height != newH){
textarea.style.maxHeight = textarea.style.height = newH;
}
if(this._needsHelpShrinking){
if(this._setTimeoutHandle){
clearTimeout(this._setTimeoutHandle);
}
this._setTimeoutHandle = setTimeout(dojo.hitch(this, "_shrink"), 0); // try to collapse multiple shrinks into 1
}
}else{
// hidden content of unknown size
this._estimateHeight(textarea);
}
this._busyResizing = false;
},
_busyResizing: false,
_shrink: function(){
// grow paddingBottom to see if scrollHeight shrinks (when it is unneccesarily big)
this._setTimeoutHandle = null;
if(this._needsHelpShrinking && !this._busyResizing){
this._busyResizing = true;
var textarea = this.textbox;
var empty = false;
if(textarea.value == ''){
textarea.value = ' '; // prevent collapse all the way back to 0
empty = true;
}
var scrollHeight = textarea.scrollHeight;
if(!scrollHeight){
this._estimateHeight(textarea);
}else{
var oldPadding = textarea.style.paddingBottom;
var newPadding = dojo._getPadExtents(textarea);
newPadding = newPadding.h - newPadding.t;
textarea.style.paddingBottom = newPadding + 1 + "px"; // tweak padding to see if height can be reduced
var newH = this._getHeight(textarea) - 1 + "px"; // see if the height changed by the 1px added
if(textarea.style.maxHeight != newH){ // if can be reduced, so now try a big chunk
textarea.style.paddingBottom = newPadding + scrollHeight + "px";
textarea.scrollTop = 0;
textarea.style.maxHeight = this._getHeight(textarea) - scrollHeight + "px"; // scrollHeight is the added padding
}
textarea.style.paddingBottom = oldPadding;
}
if(empty){
textarea.value = '';
}
this._busyResizing = false;
}
},
resize: function(){
// summary:
// Resizes the textarea vertically (should be called after a style/value change)
this._onInput();
},
_setValueAttr: function(){
this.inherited(arguments);
this.resize();
},
buildRendering: function(){
this.inherited(arguments);
// tweak textarea style to reduce browser differences
dojo.style(this.textbox, { overflowY: 'hidden', overflowX: 'auto', boxSizing: 'border-box', MsBoxSizing: 'border-box', WebkitBoxSizing: 'border-box', MozBoxSizing: 'border-box' });
},
postCreate: function(){
this.inherited(arguments);
this.connect(this.textbox, "onscroll", "_onInput");
this.connect(this.textbox, "onresize", "_onInput");
this.connect(this.textbox, "onfocus", "_onInput"); // useful when a previous estimate was off a bit
this._setTimeoutHandle = setTimeout(dojo.hitch(this, "resize"), 0);
},
uninitialize: function(){
if(this._setTimeoutHandle){
clearTimeout(this._setTimeoutHandle);
}
this.inherited(arguments);
}
});
}
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