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feat(module:input): support nzAutosize property (#251)
* feat(module:input): support nzAutosize property * docs(module:input): add textarea autosize demo close #252
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| const HIDDEN_TEXTAREA_STYLE = ` | ||
| min-height:0 !important; | ||
| max-height:none !important; | ||
| height:0 !important; | ||
| visibility:hidden !important; | ||
| overflow:hidden !important; | ||
| position:absolute !important; | ||
| z-index:-1000 !important; | ||
| top:0 !important; | ||
| right:0 !important | ||
| `; | ||
|
|
||
| const SIZING_STYLE = [ | ||
| 'letter-spacing', | ||
| 'line-height', | ||
| 'padding-top', | ||
| 'padding-bottom', | ||
| 'font-family', | ||
| 'font-weight', | ||
| 'font-size', | ||
| 'text-rendering', | ||
| 'text-transform', | ||
| 'width', | ||
| 'text-indent', | ||
| 'padding-left', | ||
| 'padding-right', | ||
| 'border-width', | ||
| 'box-sizing', | ||
| ]; | ||
|
|
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| const computedStyleCache = {}; | ||
| let hiddenTextarea; | ||
|
|
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| function calculateNodeStyling(node, useCache = false) { | ||
| const nodeRef = ( | ||
| node.getAttribute('id') || | ||
| node.getAttribute('data-reactid') || | ||
| node.getAttribute('name') | ||
| ); | ||
|
|
||
| if (useCache && computedStyleCache[nodeRef]) { | ||
| return computedStyleCache[nodeRef]; | ||
| } | ||
|
|
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| const style = window.getComputedStyle(node); | ||
|
|
||
| const boxSizing = ( | ||
| style.getPropertyValue('box-sizing') || | ||
| style.getPropertyValue('-moz-box-sizing') || | ||
| style.getPropertyValue('-webkit-box-sizing') | ||
| ); | ||
|
|
||
| const paddingSize = ( | ||
| parseFloat(style.getPropertyValue('padding-bottom')) + | ||
| parseFloat(style.getPropertyValue('padding-top')) | ||
| ); | ||
|
|
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| const borderSize = ( | ||
| parseFloat(style.getPropertyValue('border-bottom-width')) + | ||
| parseFloat(style.getPropertyValue('border-top-width')) | ||
| ); | ||
|
|
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| const sizingStyle = SIZING_STYLE | ||
| .map(name => `${name}:${style.getPropertyValue(name)}`) | ||
| .join(';'); | ||
|
|
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| const nodeInfo = { | ||
| sizingStyle, | ||
| paddingSize, | ||
| borderSize, | ||
| boxSizing, | ||
| }; | ||
|
|
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| if (useCache && nodeRef) { | ||
| computedStyleCache[nodeRef] = nodeInfo; | ||
| } | ||
|
|
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| return nodeInfo; | ||
| } | ||
|
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| export default function calculateNodeHeight( | ||
| uiTextNode, | ||
| useCache = false, | ||
| minRows: number | null = null, | ||
| maxRows: number | null = null, | ||
| ) { | ||
| if (!hiddenTextarea) { | ||
| hiddenTextarea = document.createElement('textarea'); | ||
| document.body.appendChild(hiddenTextarea); | ||
| } | ||
|
|
||
| // Fix wrap="off" issue | ||
| // https://github.com/ant-design/ant-design/issues/6577 | ||
| if (uiTextNode.getAttribute('wrap')) { | ||
| hiddenTextarea.setAttribute('wrap', uiTextNode.getAttribute('wrap')); | ||
| } else { | ||
| hiddenTextarea.removeAttribute('wrap'); | ||
| } | ||
|
|
||
| // Copy all CSS properties that have an impact on the height of the content in | ||
| // the textbox | ||
| const { | ||
| paddingSize, borderSize, | ||
| boxSizing, sizingStyle, | ||
| } = calculateNodeStyling(uiTextNode, useCache); | ||
|
|
||
| // Need to have the overflow attribute to hide the scrollbar otherwise | ||
| // text-lines will not calculated properly as the shadow will technically be | ||
| // narrower for content | ||
| hiddenTextarea.setAttribute('style', `${sizingStyle};${HIDDEN_TEXTAREA_STYLE}`); | ||
| hiddenTextarea.value = uiTextNode.value || uiTextNode.placeholder || ''; | ||
|
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| let minHeight = -Infinity; | ||
| let maxHeight = Infinity; | ||
| let height = hiddenTextarea.scrollHeight; | ||
| let overflowY; | ||
|
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| if (boxSizing === 'border-box') { | ||
| // border-box: add border, since height = content + padding + border | ||
| height = height + borderSize; | ||
| } else if (boxSizing === 'content-box') { | ||
| // remove padding, since height = content | ||
| height = height - paddingSize; | ||
| } | ||
|
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| if (minRows !== null || maxRows !== null) { | ||
| // measure height of a textarea with a single row | ||
| hiddenTextarea.value = ''; | ||
| const singleRowHeight = hiddenTextarea.scrollHeight - paddingSize; | ||
| if (minRows !== null) { | ||
| minHeight = singleRowHeight * minRows; | ||
| if (boxSizing === 'border-box') { | ||
| minHeight = minHeight + paddingSize + borderSize; | ||
| } | ||
| height = Math.max(minHeight, height); | ||
| } | ||
| if (maxRows !== null) { | ||
| maxHeight = singleRowHeight * maxRows; | ||
| if (boxSizing === 'border-box') { | ||
| maxHeight = maxHeight + paddingSize + borderSize; | ||
| } | ||
| overflowY = height > maxHeight ? '' : 'hidden'; | ||
| height = Math.min(maxHeight, height); | ||
| } | ||
| } | ||
| // Remove scroll bar flash when autosize without maxRows | ||
| if (!maxRows) { | ||
| overflowY = 'hidden'; | ||
| } | ||
| return { height, minHeight, maxHeight, overflowY }; | ||
| } |
27 changes: 27 additions & 0 deletions
27
src/showcase/nz-demo-input/nz-demo-input-textarea-auot-size.component.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| import { Component, OnInit } from '@angular/core'; | ||
|
|
||
| @Component({ | ||
| selector: 'nz-demo-input-textarea-auot-size', | ||
| template: ` | ||
| <nz-input [(ngModel)]="inputValueOne" nzType="textarea" nzAutosize nzPlaceHolder="Autosize height based on content lines"></nz-input> | ||
| <div style="margin-top: 16px;"> | ||
| <nz-input [(ngModel)]="inputValueTwo" nzType="textarea" [nzAutosize]="autosize" nzPlaceHolder="Autosize height with minimum and maximum number of lines"></nz-input> | ||
| </div> | ||
| `, | ||
| styles : [] | ||
| }) | ||
| export class NzDemoInputTextareaAutoSizeComponent implements OnInit { | ||
| inputValueOne: string; | ||
| inputValueTwo: string; | ||
| autosize = { | ||
| minRows: 2, | ||
| maxRows: 6 | ||
| }; | ||
|
|
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| constructor() { | ||
| } | ||
|
|
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| ngOnInit() { | ||
| } | ||
| } | ||
|
|
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