[image file view] rewrote it with react (#2983)

* [image file view] rewrote it with react

* [image file view] modification

* [image file view] modified code indentation & etc.

frontend/src/view-file-image.js

@@ -0,0 +1,151 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { seafileAPI } from './utils/seafile-api';
+import { Utils } from './utils/utils';
+import { gettext, siteRoot, siteName } from './utils/constants';
+import FileInfo from './components/file-view/file-info';
+import FileToolbar from './components/file-view/file-toolbar';
+import FileViewTip from './components/file-view/file-view-tip';
+import CommentsList from './components/comments-list';
+import watermark from 'watermark-dom';
+
+import './assets/css/fa-solid.css';
+import './assets/css/fa-regular.css';
+import './assets/css/fontawesome.css';
+import './css/file-view.css';
+import './css/image-file-view.css';
+
+const { fileName, isStarred, isLocked, lockedByMe,
+  repoID, filePath, err, enableWatermark, userNickName,
+  previousImage, nextImage, rawPath // only for image file
+} = window.app.pageOptions;
+
+let previousImageUrl, nextImageUrl; 
+if (previousImage) {
+  previousImageUrl = `${siteRoot}lib/${repoID}/file${Utils.encodePath(previousImage)}`;
+}
+if (nextImage) {
+  nextImageUrl = `${siteRoot}lib/${repoID}/file${Utils.encodePath(nextImage)}`;
+}
+
+class ViewFileImage extends React.Component {
+
+  constructor(props) {
+    super(props);
+    this.state = {
+      isStarred: isStarred,
+      isLocked: isLocked,
+      lockedByMe: lockedByMe,
+      isCommentPanelOpen: false
+    };
+  }
+
+  componentDidMount() {
+    document.addEventListener('keydown', (e) => {
+      if (previousImage && e.keyCode == 37) { // press '<-'
+        location.href = previousImageUrl;
+      }
+      if (nextImage && e.keyCode == 39) { // press '->'
+        location.href = nextImageUrl;
+      }
+    });
+  }
+
+  toggleCommentPanel = () => {
+    this.setState({
+      isCommentPanelOpen: !this.state.isCommentPanelOpen
+    });
+  }
+
+  toggleStar = () => {
+    if (this.state.isStarred) {
+      seafileAPI.unStarFile(repoID, filePath).then((res) => {
+        this.setState({
+          isStarred: false
+        });
+      });
+    } else {
+      seafileAPI.starFile(repoID, filePath).then((res) => {
+        this.setState({
+          isStarred: true
+        });
+      });
+    }
+  }
+
+  toggleLockFile = () => {
+    if (this.state.isLocked) {
+      seafileAPI.unlockfile(repoID, filePath).then((res) => {
+        this.setState({
+          isLocked: false, 
+          lockedByMe: false 
+        });
+      });
+    } else {
+      seafileAPI.lockfile(repoID, filePath).then((res) => {
+        this.setState({
+          isLocked: true,
+          lockedByMe: true
+        });
+      });
+    }    
+  }
+
+  render() {
+    return (
+      <div className="h-100 d-flex flex-column">
+        <div className="file-view-header d-flex justify-content-between">
+          <FileInfo
+            isStarred={this.state.isStarred}
+            isLocked={this.state.isLocked}
+            toggleStar={this.toggleStar}
+          />
+          <FileToolbar 
+            isLocked={this.state.isLocked}
+            lockedByMe={this.state.lockedByMe}
+            toggleLockFile={this.toggleLockFile}
+            toggleCommentPanel={this.toggleCommentPanel}
+          />
+        </div>
+        <div className="file-view-body flex-auto d-flex">
+          <FileContent />
+          {this.state.isCommentPanelOpen &&
+            <CommentsList toggleCommentsList={this.toggleCommentPanel} />
+          }
+        </div>
+      </div>
+    );
+  }
+}
+
+class FileContent extends React.Component {
+
+  render() {
+    if (err) {
+      return <FileViewTip />;
+    }
+    return (
+      <div className="file-view-content flex-1 image-file-view">
+        {previousImage && (
+          <a href={previousImageUrl} id="img-prev" title={gettext('you can also press ← ')}><span className="fas fa-chevron-left"></span></a>
+        )}
+        {nextImage && (
+          <a href={nextImageUrl} id="img-next" title={gettext('you can also press →')}><span className="fas fa-chevron-right"></span></a>
+        )}
+        <img src={rawPath} alt={fileName} id="image-view" />
+      </div>
+    );
+  }
+}
+
+if (enableWatermark) {
+  watermark.init({
+    watermark_txt: `${siteName} ${userNickName}`,
+    watermark_alpha: 0.075
+  });
+}
+
+ReactDOM.render (
+  <ViewFileImage />,
+  document.getElementById('wrapper')
+);