Add context menu option to save images

fixes #265

include/timeline/TimelineItem.h

@@ -99,6 +99,8 @@ protected:
 
 private:
         void init();
+        //! Add a context menu option to save the image of the timeline item.
+        void addSaveImageAction(ImageItem *image);
 
         template<class Widget>
         void setupLocalWidgetLayout(Widget *widget,

include/timeline/widgets/ImageItem.h

@@ -48,6 +48,10 @@ public:
 
         QSize sizeHint() const override;
 
+public slots:
+        //! Show a save as dialog for the image.
+        void saveAs();
+
 protected:
         void paintEvent(QPaintEvent *event) override;
         void mousePressEvent(QMouseEvent *event) override;

src/timeline/TimelineItem.cc

@@ -137,6 +137,8 @@ TimelineItem::TimelineItem(ImageItem *image,
         init();
 
         setupLocalWidgetLayout<ImageItem>(image, userid, "sent an image", withSender);
+
+        addSaveImageAction(image);
 }
 
 TimelineItem::TimelineItem(FileItem *file, const QString &userid, bool withSender, QWidget *parent)
@@ -177,6 +179,8 @@ TimelineItem::TimelineItem(ImageItem *image,
 {
         setupWidgetLayout<mtx::events::RoomEvent<mtx::events::msg::Image>, ImageItem>(
           image, event, " sent an image", with_sender);
+
+        addSaveImageAction(image);
 }
 
 TimelineItem::TimelineItem(FileItem *file,
@@ -518,3 +522,14 @@ TimelineItem::paintEvent(QPaintEvent *)
         QPainter p(this);
         style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
 }
+
+void
+TimelineItem::addSaveImageAction(ImageItem *image)
+{
+        if (contextMenu_) {
+                auto saveImage = new QAction("Save image", this);
+                contextMenu_->addAction(saveImage);
+
+                connect(saveImage, &QAction::triggered, image, &ImageItem::saveAs);
+        }
+}

src/timeline/widgets/ImageItem.cc

@@ -18,6 +18,7 @@
 #include <QBrush>
 #include <QDebug>
 #include <QDesktopServices>
+#include <QFileDialog>
 #include <QFileInfo>
 #include <QPainter>
 #include <QPixmap>
@@ -219,3 +220,32 @@ ImageItem::paintEvent(QPaintEvent *event)
                 painter.drawText(textRegion_, Qt::AlignVCenter, elidedText);
         }
 }
+
+void
+ImageItem::saveAs()
+{
+        auto filename = QFileDialog::getSaveFileName(this, tr("Save image"), text_);
+
+        if (filename.isEmpty())
+                return;
+
+        auto proxy = client_->downloadFile(url_);
+        connect(proxy,
+                &DownloadMediaProxy::fileDownloaded,
+                this,
+                [proxy, this, filename](const QByteArray &data) {
+                        proxy->deleteLater();
+
+                        try {
+                                QFile file(filename);
+
+                                if (!file.open(QIODevice::WriteOnly))
+                                        return;
+
+                                file.write(data);
+                                file.close();
+                        } catch (const std::exception &ex) {
+                                qDebug() << "Error while saving file to:" << ex.what();
+                        }
+                });
+}