From c938b710295e32ae87683de293e8957055ec4a23 Mon Sep 17 00:00:00 2001
From: 10G Meow <10gmeow@gmail.com>
Date: Sun, 21 Sep 2025 20:25:47 +0300
Subject: [PATCH] vue-pdf-embed

---
 package.json                                  |   1 +
 .../messages/composition/MessageFile.vue      | 107 +++++++++++++++++-
 2 files changed, 104 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index d7f41c2..52eeaac 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
     "vue-3-sanitize": "^0.1.4",
     "vue-clipboard2": "^0.3.3",
     "vue-i18n": "^11.1.3",
+    "vue-pdf-embed": "^2.1.3",
     "vue-router": "^4.5.1",
     "vue-swipeable-bottom-sheet": "^0.0.5",
     "vue3-emoji-picker": "^1.1.8",
diff --git a/src/components/messages/composition/MessageFile.vue b/src/components/messages/composition/MessageFile.vue
index 06b4c6f..4526322 100644
--- a/src/components/messages/composition/MessageFile.vue
+++ b/src/components/messages/composition/MessageFile.vue
@@ -8,21 +8,47 @@
       </div>
 
       <div class="message">
-        <ThumbnailView class="clickable" v-on:itemclick="onDownload" :item="attachment" />
+        <ThumbnailView class="clickable" v-on:itemclick="onItemClicked" :item="attachment" />
         <span class="edit-marker" v-if="event?.replacingEventId()">{{ $t("message.edited") }}</span>
       </div>
     </div>
+    <v-dialog v-model="showPdfDialog" fullscreen v-if="util.isMobileOrTabletBrowser()">
+      <v-card>
+        <v-toolbar :elevation="2" density="compact" class="position-fixed pdf-header" color="black">
+          <v-btn
+            icon="arrow_back"
+            @click="showPdfDialog = false"
+          ></v-btn>
+          <v-toolbar-title>{{ attachment.name }}</v-toolbar-title>
+        </v-toolbar>
+        <div class="pdf-container">
+          <div
+            v-for="(pageNum, index) in pageNums"
+            :key="pageNum"
+            :ref="(el) => { if (el) pageRefs[index] = el }"
+          >
+            <vue-pdf-embed
+              v-if="pageVisibility[pageNum]"
+              :source="doc"
+              :page="pageNum"
+            />
+          </div>
+        </div>
+      </v-card>
+    </v-dialog>
   </component>
 </template>
 
 <script setup lang="ts">
-import { computed, inject, ref, Ref } from "vue";
+import { computed, inject, ref, Ref, nextTick, watch, onBeforeUnmount } from "vue";
 import MessageIncoming from "./MessageIncoming.vue";
 import MessageOutgoing from "./MessageOutgoing.vue";
 import ThumbnailView from "../../file_mode/ThumbnailView.vue";
 import { useI18n } from "vue-i18n";
 import { MessageProps, useMessage } from "./useMessage";
 import { KeanuEvent } from "../../../models/eventAttachment";
+import VuePdfEmbed, { useVuePdfEmbed } from 'vue-pdf-embed'
+import util from "@/plugins/utils";
 
 const { t } = useI18n();
 const $matrix: any = inject("globalMatrix");
@@ -45,11 +71,84 @@ const rootComponent = computed(() => {
   return isIncoming.value ? MessageIncoming : MessageOutgoing;
 });
 
-const onDownload = () => {
-  emits("download", event.value);
+const onItemClicked = () => {
+  if(util.isMobileOrTabletBrowser()) {
+    showPdfDialog.value = true
+  } else {
+    emits("download", event.value);
+  }
 };
+
+const showPdfDialog = ref(false)
+const pageRefs = ref([]);
+const pageVisibility = ref({});
+let pageIntersectionObserver = null;
+const pdfSource = ref(null);
+
+const { doc } = useVuePdfEmbed({
+  source: pdfSource,
+});
+
+const pageNums = computed(() =>
+  doc.value ? [...Array(doc.value.numPages + 1).keys()].slice(1) : []
+);
+
+const resetPageIntersectionObserver = () => {
+  if(!util.isMobileOrTabletBrowser()) return
+  pageIntersectionObserver?.disconnect()
+  pageIntersectionObserver = new IntersectionObserver((entries) => {
+    entries.forEach((entry) => {
+      if (entry.isIntersecting) {
+        const index = pageRefs.value.findIndex((el) => el === entry.target)
+        if (index !== -1) {
+          const pageNum = pageNums.value[index]
+          pageVisibility.value[pageNum] = true
+        }
+      }
+    })
+  })
+
+  pageRefs.value.forEach((element) => {
+    if (element) pageIntersectionObserver.observe(element)
+  })
+};
+
+watch(pageNums, (newPageNums) => {
+  if(!util.isMobileOrTabletBrowser()) return
+  pageVisibility.value = { [newPageNums[0]]: true }
+  pageRefs.value = []
+  nextTick(resetPageIntersectionObserver)
+});
+
+watch(showPdfDialog, (pdfViewerShown) => {
+  if(!util.isMobileOrTabletBrowser()) return
+  if(pdfViewerShown && !pdfSource.value) {
+    pdfSource.value = attachment.value.src
+  }
+});
+
+onBeforeUnmount(() => {
+  pageIntersectionObserver?.disconnect()
+});
 </script>
 
 <style lang="scss">
 @use "@/assets/css/chat.scss" as *;
+.pdf-header {
+  z-index: 1000;
+}
+
+.pdf-container {
+  padding: 24px 16px;
+
+  & > * {
+    margin: 30px auto 0 auto;
+    min-height: 400px;
+  }
+
+  .vue-pdf-embed {
+    border: 1px solid #ccc;
+    width: 100%;
+  }
+}
 </style>