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fix(视图): 修复空格导致Element宽度小于文字宽度。 #19

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fix(视图): 修复空格导致Element宽度小于文字宽度。 #19

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19 changes: 9 additions & 10 deletions tiny-whiteboard/src/utils/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -241,17 +241,12 @@ export const splitTextLines = text => {
let textCheckEl = null
export const getTextActWidth = (text, style) => {
if (!textCheckEl) {
textCheckEl = document.createElement('div')
textCheckEl.style.position = 'fixed'
textCheckEl.style.left = '-99999px'
document.body.appendChild(textCheckEl)
textCheckEl = createCanvas(300,200)
textCheckEl.ctx.textBaseline = "middle"
}
let { fontSize, fontFamily } = style
textCheckEl.innerText = text
textCheckEl.style.fontSize = fontSize + 'px'
textCheckEl.style.fontFamily = fontFamily
let { width } = textCheckEl.getBoundingClientRect()
return width
textCheckEl.ctx.font = `${style.fontSize}px ${style.fontFamily}`
textCheckEl.ctx.fillText(text, 0, 0)
return textCheckEl.ctx.measureText(text).width
}

// 计算固定宽度内能放下所有文字的最大字号
Expand All @@ -278,6 +273,10 @@ export const getWrapTextActWidth = element => {
if (width > maxWidth) {
maxWidth = width
}
if (textCheckEl) {
const {canvas, ctx} = textCheckEl
ctx.clearRect(-canvas.width / 2, -canvas.width / 2, canvas.width * 2, canvas.width * 2)
}
})
return maxWidth
}
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