From 310febe53c06070268540ac4cd8676f6238be195 Mon Sep 17 00:00:00 2001
From: ZXY101 <tennershaun@gmail.com>
Date: Mon, 2 Oct 2023 12:05:26 +0200
Subject: [PATCH] Handle mobile viewer

---
 src/lib/components/Reader/Reader.svelte       | 130 ++++++++++++++----
 src/lib/components/Reader/TextBoxes.svelte    |  16 ++-
 .../Settings/Reader/ReaderSettings.svelte     |  12 +-
 src/lib/panzoom/util.ts                       |  23 +++-
 src/lib/settings/settings.ts                  |   2 +
 src/lib/upload/index.ts                       |   4 +-
 src/lib/util/misc.ts                          |  15 ++
 7 files changed, 162 insertions(+), 40 deletions(-)

diff --git a/src/lib/components/Reader/Reader.svelte b/src/lib/components/Reader/Reader.svelte
index 341d754..4945280 100644
--- a/src/lib/components/Reader/Reader.svelte
+++ b/src/lib/components/Reader/Reader.svelte
@@ -1,8 +1,14 @@
 <script lang="ts">
   import { catalog } from '$lib/catalog';
-  import { Panzoom, toggleFullScreen, zoomDefault } from '$lib/panzoom';
+  import {
+    Panzoom,
+    panzoomStore,
+    toggleFullScreen,
+    zoomDefault,
+    zoomFitToScreen
+  } from '$lib/panzoom';
   import { progress, settings, updateProgress } from '$lib/settings';
-  import { clamp } from '$lib/util';
+  import { clamp, debounce } from '$lib/util';
   import { Input, Popover, Range, Spinner } from 'flowbite-svelte';
   import MangaPage from './MangaPage.svelte';
   import {
@@ -181,9 +187,64 @@
 
     return maxCharCount;
   }
+
+  let startX = 0;
+  let startY = 0;
+
+  function handleTouchStart(event: TouchEvent) {
+    if ($settings.mobile) {
+      const { clientX, clientY } = event.touches[0];
+
+      startX = clientX;
+      startY = clientY;
+    }
+  }
+
+  function handlePointerUp(event: TouchEvent) {
+    if ($settings.mobile) {
+      debounce(() => {
+        if (event.touches.length === 0) {
+          const { clientX, clientY } = event.changedTouches[0];
+
+          const distanceX = clientX - startX;
+          const distanceY = clientY - startY;
+
+          const isSwipe = distanceY < 200 && distanceY > 200 * -1;
+
+          if (isSwipe) {
+            const swipeThreshold = Math.abs(($settings.swipeThreshold / 100) * window.innerWidth);
+
+            if (distanceX > swipeThreshold) {
+              left(event, true);
+            } else if (distanceX < swipeThreshold * -1) {
+              right(event, true);
+            }
+          }
+        }
+      });
+    }
+  }
+
+  function onDoubleTap(event: MouseEvent) {
+    if ($panzoomStore && $settings.mobile) {
+      const { clientX, clientY } = event;
+      const { scale } = $panzoomStore.getTransform();
+
+      if (scale < 0.5) {
+        $panzoomStore.zoomTo(clientX, clientY, 3);
+      } else {
+        zoomFitToScreen();
+      }
+    }
+  }
 </script>
 
-<svelte:window on:resize={zoomDefault} on:keyup|preventDefault={handleShortcuts} />
+<svelte:window
+  on:resize={zoomDefault}
+  on:keyup|preventDefault={handleShortcuts}
+  on:touchstart={handleTouchStart}
+  on:touchend={handlePointerUp}
+/>
 <svelte:head>
   <title>{volume?.mokuroData.volume || 'Volume'}</title>
 </svelte:head>
@@ -227,7 +288,6 @@
           max={pages.length}
           bind:value={manualPage}
           on:change={onManualPageChange}
-          cla
           defaultClass=""
         />
       </div>
@@ -239,17 +299,35 @@
   </button>
   <div class="flex" style:background-color={$settings.backgroundColor}>
     <Panzoom>
-      <button
-        class="h-full fixed -left-1/2 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01] justify-items-center"
-        on:mousedown={mouseDown}
-        on:mouseup={left}
-      />
-      <button
-        class="h-full fixed -right-1/2 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01]"
-        on:mousedown={mouseDown}
-        on:mouseup={right}
-      />
-      <div class="flex flex-row" class:flex-row-reverse={!$settings.rightToLeft}>
+      {#if !$settings.mobile}
+        <button
+          class="h-full fixed -left-1/2 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01]"
+          on:mousedown={mouseDown}
+          on:mouseup={left}
+        />
+        <button
+          class="h-full fixed -right-1/2 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01]"
+          on:mousedown={mouseDown}
+          on:mouseup={right}
+        />
+      {:else}
+        <button
+          class="h-screen fixed top-full left-0 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01]"
+          on:mousedown={mouseDown}
+          on:mouseup={left}
+        />
+        <button
+          class="h-screen fixed top-full right-0 z-10 w-1/2 hover:bg-slate-400 opacity-[0.01]"
+          on:mousedown={mouseDown}
+          on:mouseup={right}
+        />
+      {/if}
+      <div
+        class="flex flex-row"
+        class:flex-row-reverse={!$settings.rightToLeft}
+        on:dblclick={onDoubleTap}
+        role="none"
+      >
         {#if showSecondPage()}
           <MangaPage page={pages[index + 1]} src={Object.values(volume?.files)[index + 1]} />
         {/if}
@@ -257,16 +335,18 @@
       </div>
     </Panzoom>
   </div>
-  <button
-    on:mousedown={mouseDown}
-    on:mouseup={left}
-    class="left-0 top-0 absolute h-full w-10 hover:bg-slate-400 opacity-[0.01]"
-  />
-  <button
-    on:mousedown={mouseDown}
-    on:mouseup={right}
-    class="right-0 top-0 absolute h-full w-10 hover:bg-slate-400 opacity-[0.01]"
-  />
+  {#if !$settings.mobile}
+    <button
+      on:mousedown={mouseDown}
+      on:mouseup={left}
+      class="left-0 top-0 absolute h-full w-16 hover:bg-slate-400 opacity-[0.01]"
+    />
+    <button
+      on:mousedown={mouseDown}
+      on:mouseup={right}
+      class="right-0 top-0 absolute h-full w-16 hover:bg-slate-400 opacity-[0.01]"
+    />
+  {/if}
 {:else}
   <div class="fixed z-50 left-1/2 top-1/2">
     <Spinner />
diff --git a/src/lib/components/Reader/TextBoxes.svelte b/src/lib/components/Reader/TextBoxes.svelte
index d59e964..240ccc8 100644
--- a/src/lib/components/Reader/TextBoxes.svelte
+++ b/src/lib/components/Reader/TextBoxes.svelte
@@ -55,7 +55,7 @@
 </script>
 
 {#each textBoxes as { fontSize, height, left, lines, top, width, writingMode }, index (`text-box-${index}`)}
-  <button
+  <div
     class="text-box"
     style:width
     style:height
@@ -65,15 +65,15 @@
     style:font-weight={fontWeight}
     style:display
     style:border
+    style:writing-mode={writingMode}
+    role="none"
     on:dblclick={() => onUpdateCard(lines)}
     {contenteditable}
   >
-    <div style:writing-mode={writingMode}>
-      {#each lines as line}
-        <p>{line}</p>
-      {/each}
-    </div>
-  </button>
+    {#each lines as line}
+      <p>{line}</p>
+    {/each}
+  </div>
 {/each}
 
 <style>
@@ -85,6 +85,7 @@
     font-size: 16pt;
     white-space: nowrap;
     border: 1px solid rgba(0, 0, 0, 0);
+    z-index: 11;
   }
 
   .text-box:focus,
@@ -101,6 +102,7 @@
     margin: 0;
     background-color: rgb(255, 255, 255);
     font-weight: var(--bold);
+    z-index: 11;
   }
 
   .text-box:focus p,
diff --git a/src/lib/components/Settings/Reader/ReaderSettings.svelte b/src/lib/components/Settings/Reader/ReaderSettings.svelte
index de94124..43abf79 100644
--- a/src/lib/components/Settings/Reader/ReaderSettings.svelte
+++ b/src/lib/components/Settings/Reader/ReaderSettings.svelte
@@ -1,8 +1,14 @@
 <script lang="ts">
-  import { AccordionItem } from 'flowbite-svelte';
+  import { AccordionItem, Label, Range } from 'flowbite-svelte';
   import ReaderSelects from './ReaderSelects.svelte';
   import ReaderToggles from './ReaderToggles.svelte';
   import { isReader } from '$lib/util';
+  import { settings, updateSetting } from '$lib/settings';
+
+  let value = $settings.swipeThreshold;
+  function onChange() {
+    updateSetting('swipeThreshold', value);
+  }
 </script>
 
 <AccordionItem open={isReader()}>
@@ -11,5 +17,9 @@
     <ReaderSelects />
     <hr class="border-gray-100 opacity-10" />
     <ReaderToggles />
+    <div>
+      <Label>Swipe threshold</Label>
+      <Range on:change={onChange} min={20} max={90} disabled={!$settings.mobile} bind:value />
+    </div>
   </div>
 </AccordionItem>
diff --git a/src/lib/panzoom/util.ts b/src/lib/panzoom/util.ts
index 95ef575..0111a64 100644
--- a/src/lib/panzoom/util.ts
+++ b/src/lib/panzoom/util.ts
@@ -167,14 +167,23 @@ export function keepInBounds() {
   let minY = innerHeight - height - marginY;
   let maxY = marginY;
 
+  let forceCenterY = false;
+
   if (width + 2 * marginX <= innerWidth) {
     minX = marginX;
     maxX = innerWidth - width - marginX;
+  } else {
+    minX = innerWidth - width - marginX;
+    maxX = marginX;
   }
 
   if (height + 2 * marginY <= innerHeight) {
     minY = marginY;
     maxY = innerHeight - height - marginY;
+    forceCenterY = true;
+  } else {
+    minY = innerHeight - height - marginY;
+    maxY = marginY;
   }
 
   if (x < minX) {
@@ -185,11 +194,15 @@ export function keepInBounds() {
     transform.x = maxX;
   }
 
-  if (y < minY) {
-    transform.y = minY;
-  }
-  if (y > maxY) {
-    transform.y = maxY;
+  if (forceCenterY) {
+    transform.y = innerHeight / 2 - height / 2;
+  } else {
+    if (y < minY) {
+      transform.y = minY;
+    }
+    if (y > maxY) {
+      transform.y = maxY;
+    }
   }
 }
 
diff --git a/src/lib/settings/settings.ts b/src/lib/settings/settings.ts
index 44be2be..f0e31e3 100644
--- a/src/lib/settings/settings.ts
+++ b/src/lib/settings/settings.ts
@@ -37,6 +37,7 @@ export type Settings = {
   hasCover: boolean;
   mobile: boolean;
   backgroundColor: string;
+  swipeThreshold: number;
   fontSize: FontSize;
   zoomDefault: ZoomModes;
   ankiConnectSettings: AnkiConnectSettings;
@@ -67,6 +68,7 @@ const defaultSettings: Settings = {
   charCount: false,
   mobile: false,
   backgroundColor: '#030712',
+  swipeThreshold: 50,
   fontSize: 'auto',
   zoomDefault: 'zoomFitToScreen',
   ankiConnectSettings: {
diff --git a/src/lib/upload/index.ts b/src/lib/upload/index.ts
index 9dd919a..76c76f7 100644
--- a/src/lib/upload/index.ts
+++ b/src/lib/upload/index.ts
@@ -32,7 +32,7 @@ export async function unzipManga(file: File) {
 function getDetails(file: File) {
   const { webkitRelativePath, name } = file
   const split = name.split('.');
-  const ext = split.pop()
+  const ext = split.pop();
   const filename = split.join('.');
   let path = filename
 
@@ -143,7 +143,7 @@ export async function processFiles(files: File[]) {
       continue;
     }
 
-    if (zipTypes.includes(ext)) {
+    if (ext && zipTypes.includes(ext)) {
       const unzippedFiles = await unzipManga(file);
 
       volumes[path] = {
diff --git a/src/lib/util/misc.ts b/src/lib/util/misc.ts
index 3569330..6fa6fe1 100644
--- a/src/lib/util/misc.ts
+++ b/src/lib/util/misc.ts
@@ -7,4 +7,19 @@ export function clamp(num: number, min: number, max: number) {
 
 export function isReader() {
   return get(page).route.id === '/[manga]/[volume]'
+}
+
+let timer: any;
+
+export function debounce(func: () => void, timeout = 50) {
+  if (!timer) {
+    timer = setTimeout(() => {
+      func();
+      clearTimeout(timer);
+      timer = undefined;
+    }, timeout);
+  } else {
+    clearTimeout(timer);
+    timer = undefined;
+  }
 }
\ No newline at end of file