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fix: ViewportPosition #163

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This commit is contained in:
claviering 2022-10-28 09:43:30 +08:00
parent 3b45c9dc59
commit d47e414abf
1 changed files with 32 additions and 4 deletions
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36
src/views/Editor/Canvas/hooks/useViewportSize.ts
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@ -11,8 +11,8 @@ export default (canvasRef: Ref<HTMLElement | undefined>) => {
const { canvasPercentage, canvasDragged } = storeToRefs(mainStore)
const { viewportRatio } = storeToRefs(useSlidesStore())
// 计算画布可视区域的位置
const setViewportPosition = () => {
// 初始化画布可视区域的位置
const initViewportPosition = () => {
if (!canvasRef.value) return
const canvasWidth = canvasRef.value.clientWidth
const canvasHeight = canvasRef.value.clientHeight
@ -30,13 +30,41 @@ export default (canvasRef: Ref<HTMLElement | undefined>) => {
viewportTop.value = (canvasHeight - viewportActualHeight) / 2
}
}
// 计算画布可视区域的位置
const setViewportPosition = (newValue: number[], oldValue: number[]) => {
console.log(newValue, oldValue)
if (!canvasRef.value || !newValue || !newValue.length || !oldValue || !oldValue.length) return
const canvasWidth = canvasRef.value.clientWidth
const canvasHeight = canvasRef.value.clientHeight
// change canvasPercentage
if (newValue[0] !== oldValue[0]) {
const newViewportActualWidth = canvasWidth * (newValue[0] / 100)
const oldViewportActualWidth = canvasWidth * (oldValue[0] / 100)
const newViewportActualHeight = canvasHeight * (newValue[0] / 100)
const oldViewportActualHeight = canvasHeight * (oldValue[0] / 100)
mainStore.setCanvasScale(newViewportActualWidth / VIEWPORT_SIZE)
viewportLeft.value = viewportLeft.value - (newViewportActualWidth - oldViewportActualWidth) / 2
viewportTop.value = viewportTop.value - (newViewportActualHeight - oldViewportActualHeight) / 2
}
else if (newValue[1] !== oldValue[1]) {
// change viewportRatio
if (canvasHeight / canvasWidth > viewportRatio.value) {
const viewportActualWidth = canvasWidth * (canvasPercentage.value / 100)
mainStore.setCanvasScale(viewportActualWidth / VIEWPORT_SIZE)
}
else {
const viewportActualHeight = canvasHeight * (canvasPercentage.value / 100)
mainStore.setCanvasScale(viewportActualHeight / (VIEWPORT_SIZE * viewportRatio.value))
}
}
}
// 可视区域缩放或比例变化时，更新可视区域的位置
watch([canvasPercentage, viewportRatio], setViewportPosition)
// 画布拖拽状态改变（复原）时，更新可视区域的位置
watch(canvasDragged, () => {
if (!canvasDragged.value) setViewportPosition()
if (!canvasDragged.value) initViewportPosition()
})
// 画布可视区域位置和大小的样式
@ -48,7 +76,7 @@ export default (canvasRef: Ref<HTMLElement | undefined>) => {
}))
// 监听画布尺寸发生变化时，更新可视区域的位置
const resizeObserver = new ResizeObserver(setViewportPosition)
const resizeObserver = new ResizeObserver(initViewportPosition)
onMounted(() => {
if (canvasRef.value) resizeObserver.observe(canvasRef.value)