viewer: component dispatch (no functional change)

a cleaner way to add new components to LdGallery

1 files changed, 127 insertions, 0 deletions

diff --git a/viewer/src/components/item_handlers/LdPicture.vue b/viewer/src/components/item_handlers/LdPicture.vue
new file mode 100644
index 0000000..3809e4d
--- /dev/null
+++ b/viewer/src/components/item_handlers/LdPicture.vue
@@ -0,0 +1,127 @@
+<!-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2020  Guillaume FOUET
+--
+-- 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 <https://www.gnu.org/licenses/>.
+-->
+
+<template>
+  <!-- FIXME: v-dragscroll interferes with pinch-to-zoom -->
+  <div
+    ref="containerElement"
+    v-dragscroll
+    class="scrollbar ld-picture-container"
+    @click.capture="e => dragScrollClickFix.onClickCapture(e)"
+    @dblclick="$uiStore.toggleFullscreen()"
+    @dragstart.prevent
+    @dragscrollstart="dragScrollClickFix.onDragScrollStart()"
+    @dragscrollend="dragScrollClickFix.onDragScrollEnd()"
+  >
+    <v-lazy-image
+      ref="imageElement"
+      :src="pictureSrc(item.properties.resource)"
+      class="ld-picture-element"
+      :class="{'slow-loading': Boolean(slowLoadingStyle)}"
+      :style="slowLoadingStyle"
+      @load="clearSlowLoading"
+    />
+    <b-loading :active="loader" :is-full-page="false" class="ld-picture-loader" />
+  </div>
+</template>
+
+<script lang="ts">
+import { Component, Vue, Prop, Ref } from "vue-property-decorator";
+import LdZoom from "@/services/ldzoom";
+import DragScrollClickFix from "@/services/dragscrollclickfix";
+
+@Component
+export default class LdPicture extends Vue {
+  @Prop({ required: true }) readonly item!: Gallery.Picture;
+  @Ref() readonly containerElement!: HTMLDivElement;
+  @Ref() readonly imageElement!: Vue;
+
+  readonly SLOW_LOADING_TIMEOUT_MS: number = 1500;
+  readonly dragScrollClickFix = new DragScrollClickFix();
+
+  slowLoadingStyle: string | null = null;
+  loader: boolean = false;
+  timer: NodeJS.Timeout | null = null;
+
+  mounted() {
+    this.timer = setTimeout(this.generateSlowLoadingStyle, this.SLOW_LOADING_TIMEOUT_MS);
+    new LdZoom(
+      this.containerElement,
+      this.imageElement.$el as HTMLImageElement,
+      this.item.properties,
+      10,
+      1 / 5
+    ).install();
+  }
+
+  destroyed() {
+    this.clearSlowLoading();
+  }
+
+  clearSlowLoading() {
+    if (this.timer) clearTimeout(this.timer);
+    this.timer = null;
+    this.slowLoadingStyle = null;
+    this.loader = false;
+  }
+
+  pictureSrc(resource: string) {
+    return this.$galleryStore.resourceRoot + resource;
+  }
+
+  generateSlowLoadingStyle() {
+    this.clearSlowLoading();
+    this.loader = true;
+    if (this.item.thumbnail) {
+      const url = this.pictureSrc(this.item.thumbnail.resource);
+      this.slowLoadingStyle = `background-image: url('${url}');`;
+    }
+  }
+}
+</script>
+
+<style lang="scss">
+@import "~@/assets/scss/theme.scss";
+
+.ld-picture-container {
+  height: 100%;
+}
+
+.ld-picture-element {
+  max-width: unset;
+  max-height: unset;
+  cursor: grab;
+}
+
+.slow-loading {
+  background-repeat: no-repeat;
+  background-position: center;
+  background-size: contain;
+  background-color: $content-bgcolor;
+  background-blend-mode: soft-light;
+  opacity: 1 !important;
+}
+
+.ld-picture-loader {
+  position: relative;
+  & .loading-background {
+    background: none !important;
+  }
+}
+</style>