PLT-616: Enable playing of animated GIF in thumbnails and preview

web/react/components/file_attachment.jsx

@@ -10,9 +10,10 @@ export default class FileAttachment extends React.Component {
         super(props);
 
         this.loadFiles = this.loadFiles.bind(this);
+        this.playGif = this.playGif.bind(this);
 
         this.canSetState = false;
-        this.state = {fileSize: -1};
+        this.state = {fileSize: -1, mime: '', playing: false, loading: false};
     }
     componentDidMount() {
         this.loadFiles();
@@ -93,6 +94,16 @@ export default class FileAttachment extends React.Component {
 
         return true;
     }
+    playGif(e, fileUrl) {
+        var img = new Image();
+
+        this.setState({loading: true});
+        img.load(fileUrl);
+        img.onload = () => this.setState({playing: true, loading: false});
+        img.onError = () => this.setState({loading: false});
+
+        e.stopPropagation();
+    }
     render() {
         var filename = this.props.filename;
 
@@ -100,6 +111,38 @@ export default class FileAttachment extends React.Component {
         var fileUrl = utils.getFileUrl(filename);
         var type = utils.getFileType(fileInfo.ext);
 
+        var playButton = '';
+        var loadedFile = '';
+        var loadingIndicator = '';
+        if (this.state.mime === 'image/gif') {
+            playButton = (
+                <div
+                    className='file-play-button'
+                    onClick={(e) => this.playGif(e, fileUrl)}
+                >
+                    {"►"}
+                </div>
+            );
+        }
+        if (this.state.playing) {
+            loadedFile = (
+                <img
+                    className='file__loaded'
+                    src={fileUrl}
+                />
+            );
+            playButton = '';
+        }
+        if (this.state.loading) {
+            loadingIndicator = (
+                <img
+                    className='spinner file__loading'
+                    src='/static/images/load.gif'
+                />
+            );
+            playButton = '';
+        }
+
         var thumbnail;
         if (type === 'image') {
             thumbnail = (
@@ -107,7 +150,11 @@ export default class FileAttachment extends React.Component {
                     ref={filename}
                     className='post__load'
                     style={{backgroundImage: 'url(/static/images/load.gif)'}}
-                />
+                >
+                    {loadingIndicator}
+                    {playButton}
+                    {loadedFile}
+                </div>
             );
         } else {
             thumbnail = <div className={'file-icon ' + utils.getIconClassName(type)}/>;
@@ -119,7 +166,7 @@ export default class FileAttachment extends React.Component {
                 filename,
                 function success(data) {
                     if (this.canSetState) {
-                        this.setState({fileSize: parseInt(data.size, 10)});
+                        this.setState({fileSize: parseInt(data.size, 10), mime: data.mime});
                     }
                 }.bind(this),
                 function error() {}

web/react/components/view_image.jsx

@@ -38,7 +38,10 @@ export default class ViewImageModal extends React.Component {
             progress: progress,
             images: {},
             fileSizes: {},
-            showFooter: false
+            fileMimes: {},
+            showFooter: false,
+            isPlaying: {},
+            isLoading: {}
         };
     }
     handleNext(e) {
@@ -122,6 +125,28 @@ export default class ViewImageModal extends React.Component {
             this.setState({loaded});
         }
     }
+    playGif(e, filename, fileUrl) {
+        var isLoading = this.state.isLoading;
+        var isPlaying = this.state.isPlaying;
+
+        isLoading[filename] = fileUrl;
+        this.setState({isLoading});
+
+        var img = new Image();
+        img.load(fileUrl);
+        img.onload = () => {
+            delete isLoading[filename];
+            isPlaying[filename] = fileUrl;
+            this.setState({isPlaying, isLoading});
+        };
+        img.onError = () => {
+            delete isLoading[filename];
+            this.setState({isLoading});
+        };
+
+        e.stopPropagation();
+        e.preventDefault();
+    }
     componentDidMount() {
         $(window).on('keyup', this.handleKeyPress);
 
@@ -154,6 +179,10 @@ export default class ViewImageModal extends React.Component {
         var fileType = Utils.getFileType(fileInfo.ext);
 
         if (fileType === 'image') {
+            if (typeof this.state.isPlaying[filename] !== 'undefined') {
+                return this.state.isPlaying[filename];
+            }
+
             // This is a temporary patch to fix issue with old files using absolute paths
             if (fileInfo.path.indexOf('/api/v1/files/get') !== -1) {
                 fileInfo.path = fileInfo.path.split('/api/v1/files/get')[1];
@@ -189,12 +218,51 @@ export default class ViewImageModal extends React.Component {
             var fileType = Utils.getFileType(fileInfo.ext);
 
             if (fileType === 'image') {
+                if (!(filename in this.state.fileMimes)) {
+                    Client.getFileInfo(
+                        filename,
+                        (data) => {
+                            if (this.canSetState) {
+                                var fileMimes = this.state.fileMimes;
+                                fileMimes[filename] = data.mime;
+                                this.setState(fileMimes);
+                            }
+                        },
+                        () => {}
+                    );
+                }
+
+                var playButton = '';
+                if (this.state.fileMimes[filename] === 'image/gif' && !(filename in this.state.isLoading) && !(filename in this.state.isPlaying)) {
+                    playButton = (
+                        <div
+                            className='file-play-button'
+                            onClick={(e) => this.playGif(e, filename, fileUrl)}
+                        >
+                            {"►"}
+                        </div>
+                    );
+                }
+
+                var loadingIndicator = '';
+                if (this.state.isLoading[filename] === fileUrl) {
+                    loadingIndicator = (
+                        <img
+                            className='spinner file__loading'
+                            src='/static/images/load.gif'
+                        />
+                    );
+                    playButton = '';
+                }
+
                 // image files just show a preview of the file
                 content = (
                     <a
                         href={fileUrl}
                         target='_blank'
                     >
+                        {loadingIndicator}
+                        {playButton}
                         <img
                             style={{maxHeight: this.state.imgHeight}}
                             ref='image'

web/react/utils/utils.jsx

@@ -544,6 +544,7 @@ export function applyTheme(theme) {
     if (theme.buttonBg) {
         changeCss('.btn.btn-primary', 'background:' + theme.buttonBg, 1);
         changeCss('.btn.btn-primary:hover, .btn.btn-primary:active, .btn.btn-primary:focus', 'background:' + changeColor(theme.buttonBg, -0.25), 1);
+        changeCss('.file-play-button', 'color:' + changeColor(theme.buttonBg, -0.25), 1);
     }
 
     if (theme.buttonColor) {