145 lines
3.4 KiB
Vue
145 lines
3.4 KiB
Vue
<script>
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import { GlIcon } from '@gitlab/ui';
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import { throttle } from 'lodash';
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import { DESIGN_MARK_APP_START, DESIGN_MAIN_IMAGE_OUTPUT } from '~/performance/constants';
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import { performanceMarkAndMeasure } from '~/performance/utils';
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export default {
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components: {
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GlIcon,
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},
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props: {
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image: {
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type: String,
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required: false,
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default: '',
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},
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name: {
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type: String,
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required: false,
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default: '',
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},
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scale: {
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type: Number,
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required: false,
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default: 1,
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},
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},
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data() {
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return {
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baseImageSize: null,
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imageStyle: null,
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imageError: false,
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};
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},
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watch: {
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scale(val) {
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this.zoom(val);
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},
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},
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beforeDestroy() {
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window.removeEventListener('resize', this.resizeThrottled, false);
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},
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mounted() {
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if (!this.image) {
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this.onImgLoad();
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}
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this.resizeThrottled = throttle(() => {
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// NOTE: if imageStyle is set, then baseImageSize
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// won't change due to resize. We must still emit a
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// `resize` event so that the parent can handle
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// resizes appropriately (e.g. for design_overlay)
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this.setBaseImageSize();
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}, 400);
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window.addEventListener('resize', this.resizeThrottled, false);
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},
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methods: {
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onImgLoad() {
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requestIdleCallback(this.setBaseImageSize, { timeout: 1000 });
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requestIdleCallback(this.setImageNaturalScale, { timeout: 1000 });
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performanceMarkAndMeasure({
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measures: [
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{
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name: DESIGN_MAIN_IMAGE_OUTPUT,
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start: DESIGN_MARK_APP_START,
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},
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],
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});
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},
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onImgError() {
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this.imageError = true;
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},
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setBaseImageSize() {
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const { contentImg } = this.$refs;
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if (!contentImg || contentImg.offsetHeight === 0 || contentImg.offsetWidth === 0) return;
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this.baseImageSize = {
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height: contentImg.offsetHeight,
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width: contentImg.offsetWidth,
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};
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this.onResize({ width: this.baseImageSize.width, height: this.baseImageSize.height });
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},
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setImageNaturalScale() {
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const { contentImg } = this.$refs;
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if (!contentImg) {
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return;
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}
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const { naturalHeight, naturalWidth } = contentImg;
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// In case image 404s
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if (naturalHeight === 0 || naturalWidth === 0) {
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return;
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}
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const { height, width } = this.baseImageSize;
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this.$parent.$emit(
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'setMaxScale',
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Math.round(((height + width) / (naturalHeight + naturalWidth)) * 100) / 100,
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);
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},
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onResize({ width, height }) {
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this.$emit('resize', { width, height });
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},
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zoom(amount) {
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if (amount === 1) {
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this.imageStyle = null;
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this.$nextTick(() => {
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this.setBaseImageSize();
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});
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return;
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}
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const width = this.baseImageSize.width * amount;
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const height = this.baseImageSize.height * amount;
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this.imageStyle = {
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width: `${width}px`,
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height: `${height}px`,
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};
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this.onResize({ width, height });
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},
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},
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};
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</script>
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<template>
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<div class="gl-mx-auto gl-my-auto js-design-image">
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<gl-icon v-if="imageError" class="gl-text-gray-200" name="media-broken" :size="48" />
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<img
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v-show="!imageError"
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ref="contentImg"
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class="mh-100"
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:src="image"
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:alt="name"
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:style="imageStyle"
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:class="{ 'img-fluid': !imageStyle }"
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@error="onImgError"
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@load="onImgLoad"
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/>
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</div>
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</template>
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