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Merge pull request #1015 from nextcloud-libraries/fix/stable4-previews
[stable4] Backport preview generation for FilePicker
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| <template> | ||
| <div :style="canLoadPreview ? { backgroundImage: `url(${previewURL})`} : undefined" | ||
| :aria-label="t('Mime type {mime}', { mime: node.mime || t('unknown') })" | ||
| class="file-picker__file-icon"> | ||
| <template v-if="!canLoadPreview"> | ||
| <IconFile v-if="isFile" :size="20" /> | ||
| <IconFolder v-else :size="20" /> | ||
| </template> | ||
| </div> | ||
| </template> | ||
|
|
||
| <script setup lang="ts"> | ||
| import { FileType, type Node } from '@nextcloud/files' | ||
| import { usePreviewURL } from '../../usables/preview' | ||
| import { computed, ref, toRef, watch } from 'vue' | ||
| import { t } from '../../utils/l10n' | ||
| import IconFile from 'vue-material-design-icons/File.vue' | ||
| import IconFolder from 'vue-material-design-icons/Folder.vue' | ||
| const props = defineProps<{ | ||
| node: Node | ||
| }>() | ||
| const { previewURL } = usePreviewURL(toRef(props, 'node')) | ||
| const isFile = computed(() => props.node.type === FileType.File) | ||
| const canLoadPreview = ref(false) | ||
| watch(previewURL, () => { | ||
| canLoadPreview.value = false | ||
| if (previewURL.value) { | ||
| const loader = document.createElement('img') | ||
| loader.src = previewURL.value.href | ||
| loader.onerror = () => loader.remove() | ||
| loader.onload = () => { canLoadPreview.value = true; loader.remove() } | ||
| document.body.appendChild(loader) | ||
| } | ||
| }, { immediate: true }) | ||
| </script> | ||
|
|
||
| <style scoped lang="scss"> | ||
| .file-picker__file-icon { | ||
| width: 32px; | ||
| height: 32px; | ||
| min-width: 32px; | ||
| min-height: 32px; | ||
| background-repeat: no-repeat; | ||
| background-size: contain; | ||
| // for the fallback | ||
| display: flex; | ||
| justify-content: center; | ||
| } | ||
| </style> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /** | ||
| * @copyright Copyright (c) 2023 Ferdinand Thiessen <opensource@fthiessen.de> | ||
| * | ||
| * @author Ferdinand Thiessen <opensource@fthiessen.de> | ||
| * | ||
| * @license AGPL-3.0-or-later | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as | ||
| * published by the Free Software Foundation, either version 3 of the | ||
| * License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| import type { Node } from '@nextcloud/files' | ||
| import type { Ref } from 'vue' | ||
|
|
||
| import { generateUrl } from '@nextcloud/router' | ||
| import { toValue } from '@vueuse/core' | ||
| import { ref, watchEffect } from 'vue' | ||
|
|
||
| interface PreviewOptions { | ||
| /** | ||
| * Size of the previews in px | ||
| * @default 32 | ||
| */ | ||
| size?: number | ||
| /** | ||
| * Should the preview fall back to the mime type icon | ||
| * @default true | ||
| */ | ||
| mimeFallback?: boolean | ||
| /** | ||
| * Should the preview be cropped or fitted | ||
| * @default false (meaning it gets fitted) | ||
| */ | ||
| cropPreview?: boolean | ||
| } | ||
|
|
||
| /** | ||
| * Generate the preview URL of a file node | ||
| * | ||
| * @param node The node to generate the preview for | ||
| * @param options Preview options | ||
| */ | ||
| export function getPreviewURL(node: Node, options: PreviewOptions = {}) { | ||
| options = { size: 32, cropPreview: false, mimeFallback: true, ...options } | ||
|
|
||
| try { | ||
| const previewUrl = node.attributes?.previewUrl | ||
| || generateUrl('/core/preview?fileId={fileid}', { | ||
| fileid: node.fileid, | ||
| }) | ||
|
|
||
| let url | ||
| try { | ||
| url = new URL(previewUrl) | ||
| } catch (e) { | ||
| url = new URL(previewUrl, window.location.origin) | ||
| } | ||
|
|
||
| // Request preview with params | ||
| url.searchParams.set('x', `${options.size}`) | ||
| url.searchParams.set('y', `${options.size}`) | ||
| url.searchParams.set('mimeFallback', `${options.mimeFallback}`) | ||
| url.searchParams.set('c', `${node.attributes.etag}`) // cache busting | ||
|
|
||
| // Handle cropping | ||
| url.searchParams.set('a', options.cropPreview === true ? '0' : '1') | ||
| return url | ||
| } catch (e) { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| export const usePreviewURL = (node: Node | Ref<Node>, options?: PreviewOptions | Ref<PreviewOptions>) => { | ||
| const previewURL = ref<URL|null>(null) | ||
|
|
||
| watchEffect(() => { | ||
| previewURL.value = getPreviewURL(toValue(node), toValue(options || {})) | ||
| }) | ||
|
|
||
| return { | ||
| previewURL, | ||
| } | ||
| } |
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