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120 lines
3.0 KiB
JavaScript
Executable File
120 lines
3.0 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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HTMLTextAreaElement.prototype.updateSize = function(){
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this.style.height = ''
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this.style.height = this.scrollHeight + 'px'
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return this }
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HTMLTextAreaElement.prototype.autoUpdateSize = function(){
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var that = this
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this.addEventListener('input',
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function(evt){
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that.updateSize() })
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return this }
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HTMLTextAreaElement.prototype.getTextGeometry = function(){
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var offset = this.selectionStart
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var text = this.value
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// get the relevant styles...
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var style = getComputedStyle(this)
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var s = {}
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for(var i=0; i < style.length; i++){
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var k = style[i]
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if(k.startsWith('font')
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|| k.startsWith('line')
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|| k.startsWith('white-space')){
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s[k] = style[k] } }
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var carret = document.createElement('span')
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carret.innerText = '|'
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carret.style.margin = '0px'
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carret.style.padding = '0px'
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var span = document.createElement('span')
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span.innerText = text.slice(0, offset)
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Object.assign(span.style, {
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...s,
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position: 'fixed',
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display: 'block',
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top: '-100%',
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left: '-100%',
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width: this.offsetWidth + 'px',
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height: this.scrollHeight + 'px',
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padding: style.padding,
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outline: 'solid 1px red',
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pointerEvents: 'none',
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})
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span.append(carret)
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document.body.append(span)
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var res = {
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length: text.length,
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lines: Math.floor(this.offsetHeight / carret.offsetHeight),
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line: Math.floor(carret.offsetTop / carret.offsetHeight),
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offset: offset,
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offsetLeft: carret.offsetLeft,
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offsetTop: carret.offsetTop,
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}
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span.remove()
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return res }
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// calculate number of lines in text area (both wrapped and actual lines)
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Object.defineProperty(HTMLTextAreaElement.prototype, 'heightLines', {
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enumerable: false,
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get: function(){
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var style = getComputedStyle(this)
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return Math.floor(
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(this.scrollHeight
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- parseFloat(style.paddingTop)
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- parseFloat(style.paddingBottom))
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/ (parseFloat(style.lineHeight)
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|| parseFloat(style.fontSize))) }, })
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Object.defineProperty(HTMLTextAreaElement.prototype, 'lines', {
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enumerable: false,
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get: function(){
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return this.value
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.split(/\n/g)
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.length }, })
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// XXX this does not account for wrapping...
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Object.defineProperty(HTMLTextAreaElement.prototype, 'caretLine', {
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enumerable: false,
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get: function(){
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var offset = this.selectionStart
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return offset != null ?
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this.value
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.slice(0, offset)
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.split(/\n/g)
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.length
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: undefined }, })
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Object.defineProperty(HTMLTextAreaElement.prototype, 'caretOffset', {
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enumerable: false,
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get: function(){
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var offset = this.selectionStart
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var r = document.createRange()
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r.setStart(this, offset)
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r.setEnd(this, offset)
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var rect = r.getBoundingClientRect()
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return {
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top: rect.top,
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left: rect.left,
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} },
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})
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/**********************************************************************
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* vim:set ts=4 sw=4 : */
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