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feat:web text maxLines

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This commit is contained in:
钱泽虹
2023-09-13 19:08:28 +08:00
committed by osborn
parent afb3de1fbc
commit d71e55e673
3 changed files with 56 additions and 42 deletions
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50
doric-web/src/shader/DoricTextNode.ts
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@@ -8,7 +8,6 @@ export class DoricTextNode extends DoricViewNode {
const div = document.createElement('div')
div.style.display = "flex"
div.style.overflow = "hidden"
div.style.lineHeight = `${this.lineHeight()}em`
this.textElement = document.createElement('span')
div.appendChild(this.textElement)
div.style.justifyContent = "center"
@@ -100,30 +99,39 @@ export class DoricTextNode extends DoricViewNode {
configSize() {
if (this.maxLines > 0) {
const computedStyle = window.getComputedStyle(this.view)
const currentContentHeight = this.view.clientHeight - pixelString2Number(computedStyle.paddingTop) - pixelString2Number(computedStyle.paddingBottom)
let maxHeight = Math.ceil(parseFloat(computedStyle.getPropertyValue('font-size')) * this.lineHeight() * this.maxLines)
if (currentContentHeight > 0) {
maxHeight = Math.min(maxHeight, Math.ceil(currentContentHeight))
const computedStyle = window.getComputedStyle(this.view)
const lineHeight = this.lineHeight(computedStyle)
let allowedMaxLines = this.maxLines
const contentHeight = this.view.clientHeight - pixelString2Number(computedStyle.paddingTop) - pixelString2Number(computedStyle.paddingBottom)
if (contentHeight > 0) {
const contentAllowedLines = Math.floor(contentHeight / lineHeight)
allowedMaxLines = Math.min(this.maxLines, contentAllowedLines)
}
if (this.computedHeight(computedStyle) > maxHeight) {
this.textElement.innerText = this.truncationText(computedStyle, maxHeight)
const originalLines = Math.floor(this.originalHeight(computedStyle) / lineHeight)
if (originalLines > allowedMaxLines) {
this.textElement.innerText = this.truncationText(computedStyle, lineHeight, allowedMaxLines)
}
}
}
lineHeight() {
return 1.3
lineHeight(style: CSSStyleDeclaration) {
const canvas = document.createElement('canvas')
const ctx = canvas.getContext('2d')
ctx!.font = style.font
const pureText = this.textElement.innerText.replace(/\n/g, '')
const metrics = ctx!.measureText(pureText)
return metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent
}
computedHeight(style:CSSStyleDeclaration) {
originalHeight(style:CSSStyleDeclaration) {
const tempEle = document.createElement('div')
tempEle.style.font = style.font
tempEle.textContent = this.textElement.innerText
tempEle.style.whiteSpace = 'normal'
this.view.style.overflow = 'hidden'
tempEle.style.lineHeight = `${this.lineHeight()}em`
tempEle.style.width = this.view.style.width
tempEle.style.whiteSpace = style.whiteSpace
this.view.style.overflow = style.overflow
tempEle.style.width = style.width
document.body.appendChild(tempEle)
const height = tempEle.offsetHeight
@@ -131,22 +139,22 @@ export class DoricTextNode extends DoricViewNode {
return height
}
truncationText(style:CSSStyleDeclaration, maxHeight:number) {
truncationText(style:CSSStyleDeclaration, lineHeight:number, maxLines:number) {
const originalText = this.textElement.innerText
let start = 0, end = originalText.length
const tempEle = document.createElement('div')
tempEle.style.font = style.font
tempEle.style.whiteSpace = 'normal'
this.view.style.overflow = 'hidden'
tempEle.style.lineHeight = `${this.lineHeight()}em`
tempEle.style.width = this.view.style.width
tempEle.style.whiteSpace = style.whiteSpace
this.view.style.overflow = style.overflow
tempEle.style.width = style.width
document.body.appendChild(tempEle);
while(start <= end) {
const mid = Math.floor((start + end) / 2)
tempEle.textContent = originalText.slice(0,mid) + '...'
if (tempEle.offsetHeight > maxHeight) {
const lines = Math.floor(tempEle.offsetHeight / lineHeight)
if (lines > maxLines) {
end = mid - 1
} else {
start = mid + 1