From 6d2b3ec072fa05223affeeb441299f87935777c3 Mon Sep 17 00:00:00 2001
From: Nolan Lawson <nolan@nolanlawson.com>
Date: Sun, 3 Feb 2019 12:33:15 -0800
Subject: [PATCH] feat: add pinch-zoom to media dialog (#933)

* feat: add pinch-zoom to media dialog

* fix zoom buttons
---
 .gitignore                                    |   1 +
 bin/svgs.js                                   |   5 +-
 package.json                                  |   1 +
 .../dialog/components/MediaDialog.html        | 117 ++++++++++++------
 .../dialog/components/PinchZoomable.html      | 115 +++++++++++++++++
 yarn.lock                                     |  12 ++
 6 files changed, 213 insertions(+), 38 deletions(-)
 create mode 100644 src/routes/_components/dialog/components/PinchZoomable.html

diff --git a/.gitignore b/.gitignore
index 41dce00..cb1cb0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ node_modules
 /static/inline-script.js.map
 /static/emoji-mart-all.json
 /src/inline-script/checksum.js
+yarn-error.log
diff --git a/bin/svgs.js b/bin/svgs.js
index 0962d37..f48e0a1 100644
--- a/bin/svgs.js
+++ b/bin/svgs.js
@@ -40,6 +40,7 @@ module.exports = [
   { id: 'fa-circle', src: 'src/thirdparty/font-awesome-svg-png/white/svg/circle.svg' },
   { id: 'fa-circle-o', src: 'src/thirdparty/font-awesome-svg-png/white/svg/circle-o.svg' },
   { id: 'fa-angle-left', src: 'src/thirdparty/font-awesome-svg-png/white/svg/angle-left.svg' },
-  { id: 'fa-angle-right', src: 'src/thirdparty/font-awesome-svg-png/white/svg/angle-right.svg' }
-
+  { id: 'fa-angle-right', src: 'src/thirdparty/font-awesome-svg-png/white/svg/angle-right.svg' },
+  { id: 'fa-search-minus', src: 'src/thirdparty/font-awesome-svg-png/white/svg/search-minus.svg' },
+  { id: 'fa-search-plus', src: 'src/thirdparty/font-awesome-svg-png/white/svg/search-plus.svg' }
 ]
diff --git a/package.json b/package.json
index 09af4c6..646a619 100644
--- a/package.json
+++ b/package.json
@@ -78,6 +78,7 @@
     "p-any": "^1.1.0",
     "page-lifecycle": "^0.1.1",
     "performance-now": "^2.1.0",
+    "pinch-zoom-element": "^1.1.0",
     "prop-types": "^15.6.2",
     "quick-lru": "^2.0.0",
     "remount": "^0.9.3",
diff --git a/src/routes/_components/dialog/components/MediaDialog.html b/src/routes/_components/dialog/components/MediaDialog.html
index b9a008d..9dd01b0 100644
--- a/src/routes/_components/dialog/components/MediaDialog.html
+++ b/src/routes/_components/dialog/components/MediaDialog.html
@@ -11,44 +11,58 @@
         <div class="media-scroll-item">
           <div class="media-scroll-item-inner">
             <div class="media-scroll-item-inner-inner">
-              <MediaInDialog {media} />
+                <PinchZoomable className='media-pinch-zoom' disabled={!pinchZoomMode} >
+                  <MediaInDialog {media} />
+                </PinchZoomable>
             </div>
           </div>
         </div>
       {/each}
     </div>
-    {#if dots.length > 1}
-      <div class="media-controls">
-        <IconButton
-          className="media-control-button"
-          disabled={scrolledItem === 0}
-          label="Show previous media"
-          href="#fa-angle-left"
-          on:click="prev()"
-        />
-        {#each dots as dot, i (dot.i)}
-          <IconButton
-            className="media-control-button"
-            pressable={true}
-            label="Show {nth(i)} media"
-            pressed={i === scrolledItem}
-            href={i === scrolledItem ? '#fa-circle' : '#fa-circle-o'}
-            sameColorWhenPressed={true}
-            on:click="onClick(i)"
-          />
-        {/each}
-        <IconButton
-          className="media-control-button"
-          disabled={scrolledItem === length - 1}
-          label="Show next media"
-          href="#fa-angle-right"
-          on:click="next()"
-        />
-      </div>
-    {/if}
+    <div class="media-controls-outside">
+      <IconButton
+        className="media-control-button media-control-button-dummy-spacer"
+        href="#fa-search"
+      />
+      {#if dots.length > 1}
+        <div class="media-controls">
+            <IconButton
+              className="media-control-button"
+              disabled={scrolledItem === 0}
+              label="Show previous media"
+              href="#fa-angle-left"
+              on:click="prev()"
+            />
+            {#each dots as dot, i (dot.i)}
+              <IconButton
+                className="media-control-button"
+                pressable={true}
+                label="Show {nth(i)} media"
+                pressed={i === scrolledItem}
+                href={i === scrolledItem ? '#fa-circle' : '#fa-circle-o'}
+                sameColorWhenPressed={true}
+                on:click="onClick(i)"
+              />
+            {/each}
+            <IconButton
+              className="media-control-button"
+              disabled={scrolledItem === length - 1}
+              label="Show next media"
+              href="#fa-angle-right"
+              on:click="next()"
+            />
+        </div>
+      {/if}
+      <IconButton
+        className="media-control-button"
+        pressable={true}
+        pressed={pinchZoomMode}
+        label={pinchZoomMode ? 'Disable pinch-zoom mode' : 'Enable pinch-zoom mode'}
+        href="#fa-search"
+        on:click="togglePinchZoomMode()"
+      />
+    </div>
   </div>
-
-
 </ModalDialog>
 
 <Shortcut scope='mediaDialog' key="ArrowLeft" on:pressed="prev()" />
@@ -92,14 +106,37 @@
     padding: 5px;
   }
 
+  .media-controls-outside {
+    display: flex;
+    justify-content: space-between;
+    margin: 10px;
+  }
+
   .media-controls {
     display: flex;
     justify-content: space-between;
-    margin: 10px auto;
   }
 
-  :global(.media-control-button) {
-    margin: 0 5px;
+  :global(.media-pinch-zoom) {
+    width: 100%;
+    height: 100%;
+  }
+
+  :global(.media-control-button-dummy-spacer) {
+    visibility: hidden;
+  }
+
+  @media (min-width: 768px) {
+    :global(.media-control-button) {
+      margin: 0 5px;
+    }
+  }
+
+  @media (max-width: 320px) {
+    :global(.icon-button.media-control-button) {
+      padding-left: 5px;
+      padding-right: 5px;
+    }
   }
 
   @supports (scroll-snap-align: start) {
@@ -129,6 +166,7 @@
   import MediaInDialog from './MediaInDialog.html'
   import IconButton from '../../IconButton.html'
   import Shortcut from '../../shortcut/Shortcut.html'
+  import PinchZoomable from './PinchZoomable.html'
   import { show } from '../helpers/showDialog'
   import { oncreate as onCreateDialog } from '../helpers/onCreateDialog'
   import debounce from 'lodash-es/debounce'
@@ -163,6 +201,9 @@
       popShortcutScope('mediaDialog')
     },
     store: () => store,
+    data: () => ({
+      pinchZoomMode: false
+    }),
     computed: {
       length: ({ mediaItems }) => mediaItems.length,
       dots: ({ length }) => times(length, i => ({ i }))
@@ -171,7 +212,8 @@
       ModalDialog,
       MediaInDialog,
       IconButton,
-      Shortcut
+      Shortcut,
+      PinchZoomable
     },
     helpers: {
       nth (i) {
@@ -229,6 +271,9 @@
         } else {
           scroller.scrollLeft = scrollLeft
         }
+      },
+      togglePinchZoomMode () {
+        this.set({ pinchZoomMode: !this.get().pinchZoomMode })
       }
     }
   }
diff --git a/src/routes/_components/dialog/components/PinchZoomable.html b/src/routes/_components/dialog/components/PinchZoomable.html
new file mode 100644
index 0000000..cdd7870
--- /dev/null
+++ b/src/routes/_components/dialog/components/PinchZoomable.html
@@ -0,0 +1,115 @@
+<div class="pinch-zoom {disabled ? 'pinch-zoom-disabled' : ''} {className ? className : ''}" >
+  <pinch-zoom class="pinch-zoom-inner" ref:node>
+    <slot></slot>
+  </pinch-zoom>
+  <IconButton
+    className="pinch-zoom-button pinch-zoom-button-zoom-out"
+    muted={true}
+    label="Zoom out"
+    href="#fa-search-minus"
+    on:click="zoomOut()"
+  />
+  <IconButton
+    className="pinch-zoom-button pinch-zoom-button-zoom-in"
+    muted={true}
+    label="Zoom in"
+    href="#fa-search-plus"
+    on:click="zoomIn()"
+  />
+</div>
+<style>
+  .pinch-zoom {
+    position: relative;
+  }
+  .pinch-zoom-disabled {
+    pointer-events: none;
+  }
+  .pinch-zoom-inner {
+    width: 100%;
+    height: 100%;
+  }
+
+  :global(.icon-button.pinch-zoom-button) {
+    position: absolute;
+    z-index: 110;
+    bottom: 10px;
+    background: var(--mask-opaque-bg);
+  }
+
+  :global(.pinch-zoom-button-zoom-in) {
+    right: 10px;
+  }
+
+  :global(.pinch-zoom-button-zoom-out) {
+    left: 10px;
+  }
+
+  @media (max-width: 767px) {
+    :global(.pinch-zoom-button-zoom-in) {
+      right: 5px;
+    }
+
+    :global(.pinch-zoom-button-zoom-out) {
+      left: 5px;
+    }
+  }
+
+  @media (max-width: 320px) {
+    :global(.icon-button.pinch-zoom-button) {
+      padding-left: 5px;
+      padding-right: 5px;
+    }
+  }
+
+  :global(.pinch-zoom-disabled .pinch-zoom-button) {
+    visibility: hidden;
+  }
+</style>
+<script>
+  import IconButton from '../../IconButton.html'
+  import 'pinch-zoom-element/dist/pinch-zoom.js'
+  import { observe } from 'svelte-extras'
+
+  const ZOOM_INCREMENT = 0.1
+
+  export default {
+    oncreate () {
+      this.observe('disabled', disabled => {
+        if (disabled) {
+          this.resetZoom()
+        }
+      }, { init: false })
+    },
+    data: () => ({
+      disabled: false
+    }),
+    components: {
+      IconButton
+    },
+    methods: {
+      observe,
+      zoomIn () {
+        this.zoomBy(ZOOM_INCREMENT)
+      },
+      zoomOut () {
+        this.zoomBy(-ZOOM_INCREMENT)
+      },
+      zoomBy (increment) {
+        let { node } = this.refs
+        let scale = node.scale || 1
+        node.scaleTo(scale + increment, {
+          originX: '50%',
+          originY: '50%'
+        })
+      },
+      resetZoom () {
+        let { node } = this.refs
+        node.setTransform({
+          scale: 1,
+          x: 0,
+          y: 0
+        })
+      }
+    }
+  }
+</script>
diff --git a/yarn.lock b/yarn.lock
index 2bc3fe4..72836d4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5604,6 +5604,13 @@ pify@^3.0.0:
   resolved "https://registry.yarnpkg.com/pify/-/pify-3.0.0.tgz#e5a4acd2c101fdf3d9a4d07f0dbc4db49dd28176"
   integrity sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=
 
+pinch-zoom-element@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/pinch-zoom-element/-/pinch-zoom-element-1.1.0.tgz#0e12c3f7bd63631e45596d1417a15759f80a4e9c"
+  integrity sha512-jzF7Uad61b1+BnaEktbtOl025WaLDbwVgpcG4qive1OLwuFNU2Itt2c5tD6pp1sx4XgKhLzqjVgQ9qmCr3y6Ew==
+  dependencies:
+    pointer-tracker "^2.0.3"
+
 pinkie-promise@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/pinkie-promise/-/pinkie-promise-1.0.0.tgz#d1da67f5482563bb7cf57f286ae2822ecfbf3670"
@@ -5685,6 +5692,11 @@ pngjs@^3.3.1:
   resolved "https://registry.yarnpkg.com/pngjs/-/pngjs-3.3.3.tgz#85173703bde3edac8998757b96e5821d0966a21b"
   integrity sha512-1n3Z4p3IOxArEs1VRXnZ/RXdfEniAUS9jb68g58FIXMNkPJeZd+Qh4Uq7/e0LVxAQGos1eIUrqrt4FpjdnEd+Q==
 
+pointer-tracker@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/pointer-tracker/-/pointer-tracker-2.0.3.tgz#6e66be8330e9f4e83c81d76e1d78e42eb4f89c00"
+  integrity sha512-PURBF4oc45JPECuguX6oPL3pJU5AlF0Nb/4sZdmqzPNAkV4LGL9MJMqb0smWDtmQ0F0KpbxEJn4/Lf5ugN1keQ==
+
 posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"