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| <template>
| <PreviewImage :mode="openScale ? 'scaleToFill' : 'widthFix'" :style="_style" v-bind="props" />
| </template>
|
| <script setup lang="ts">
| import PreviewImage from './PreviewImage.vue';
| import { previewImageProps } from './previewImage';
| import Taro from '@tarojs/taro';
| import { CSSProperties, computed, reactive, watch } from 'vue';
|
| defineOptions({
| name: 'AutoWidthImage',
| });
|
| const props = defineProps({
| ...previewImageProps,
| openScale: {
| type: Boolean,
| },
| });
|
| const MaxHeight = 375;
| const MaxWidth = 375;
|
| const state = reactive({
| width: 0,
| height: 0,
| });
|
| watch(
| () => props.src,
| () => {
| if (props.src) {
| Taro.getImageInfo({
| src: props.src,
| success(result) {
| state.width = result.width;
| state.height = result.height;
| },
| });
| }
| },
| {
| immediate: true,
| }
| );
|
| const _style = computed(() => {
| if (state.width > state.height) {
| if (props.openScale) {
| const width = Math.min(MaxWidth, state.width);
| const scale = width / state.width;
|
| return {
| height: `${state.height * scale}px`,
| width: `${width}px`,
| } as CSSProperties;
| } else {
| return {
| width: `${state.width}px`,
| maxWidth: '100%',
| };
| }
| } else {
| const height = Math.min(MaxHeight, state.height);
| const scale = height / state.height;
| return {
| height: `${height}px`,
| width: `${state.width * scale}px`,
| } as CSSProperties;
| }
| });
| </script>
|
|
