logic: add menu action for graph 'save as image' (issue #426) (#1104)

src/lib/CMakeLists.txt

@@ -489,6 +489,7 @@ add_files(
 	utility/messaging/type/graph/MessageGraphNodeHide.h
 	utility/messaging/type/graph/MessageGraphNodeMove.h
 	utility/messaging/type/graph/MessageScrollGraph.h
+	utility/messaging/type/graph/MessageSaveAsImage.h
 
 	utility/messaging/type/history/MessageHistoryToPosition.h
 	utility/messaging/type/history/MessageHistoryRedo.h

src/lib/utility/messaging/type/graph/MessageSaveAsImage.h

@@ -0,0 +1,20 @@
+#ifndef MESSAGE_SAVE_AS_IMAGE_H
+#define MESSAGE_SAVE_AS_IMAGE_H
+
+#include "Message.h"
+
+
+class MessageSaveAsImage: public Message<MessageSaveAsImage>
+{
+public:
+	MessageSaveAsImage(QString path) : path(path) {}
+
+	static const std::string getStaticType()
+	{
+		return "MessageSaveAsImage";
+	}
+
+	QString path;
+};
+
+#endif /* MESSAGE_SAVE_AS_IMAGE_H */

src/lib_gui/qt/graphics/QtGraphicsView.cpp

@@ -166,6 +166,8 @@ QtGraphicsView::QtGraphicsView(GraphFocusHandler* focusHandler, QWidget* parent)
 	m_legendButton->setObjectName(QStringLiteral("legend_button"));
 	m_legendButton->setToolTip(QStringLiteral("show legend"));
 	connect(m_legendButton, &QPushButton::clicked, this, &QtGraphicsView::legendClicked);
+
+	m_tabId = TabId::currentTab();
 }
 
 float QtGraphicsView::getZoomFactor() const
@@ -183,6 +185,8 @@ void QtGraphicsView::setSceneRect(const QRectF& rect)
 {
 	QGraphicsView::setSceneRect(rect);
 	scene()->setSceneRect(rect);
+	m_imageCached = toQImage();
+	m_tabId = TabId::currentTab();
 }
 
 QtGraphNode* QtGraphicsView::getNodeAtCursorPosition() const
@@ -724,7 +728,6 @@ void QtGraphicsView::exportGraph()
 			QStringLiteral("PNG (*.png);;JPEG (*.JPEG);;BMP Files (*.bmp);;SVG (*.svg)"))
 			.toStdWString());
 
-
 	if (filePath.extension() == L".svg")
 	{
 		QSvgGenerator svgGen;
@@ -852,3 +855,11 @@ void QtGraphicsView::updateTransform()
 	float zoomFactor = m_appZoomFactor * m_zoomFactor;
 	setTransform(QTransform(zoomFactor, 0, 0, zoomFactor, 0, 0));
 }
+
+void QtGraphicsView::handleMessage(MessageSaveAsImage* message)
+{
+	if ( (message->getSchedulerId() == getSchedulerId()) && !m_imageCached.isNull() )
+	{
+		m_imageCached.save(message->path);
+	}
+}

src/lib_gui/qt/graphics/QtGraphicsView.h

@@ -6,6 +6,9 @@
 #include <QGraphicsView>
 
 #include "types.h"
+#include "MessageListener.h"
+#include "MessageSaveAsImage.h"
+
 
 class GraphFocusHandler;
 class QPushButton;
@@ -14,7 +17,7 @@ class QtGraphEdge;
 class QtGraphNode;
 class QtSelfRefreshIconButton;
 
-class QtGraphicsView: public QGraphicsView
+class QtGraphicsView: public QGraphicsView, public MessageListener<MessageSaveAsImage>
 {
 	Q_OBJECT
 
@@ -33,6 +36,11 @@ public:
 
 	void updateZoom(float delta);
 
+	Id getSchedulerId() const override
+	{
+		return m_tabId;
+	}
+
 protected:
 	void resizeEvent(QResizeEvent* event);
 
@@ -90,6 +98,8 @@ private:
 	void setZoomFactor(float zoomFactor);
 	void updateTransform();
 
+	void handleMessage(MessageSaveAsImage* message) override;
+
 	GraphFocusHandler* m_focusHandler;
 
 	QPoint m_last;
@@ -141,6 +151,9 @@ private:
 
 	float m_zoomInButtonSpeed;
 	float m_zoomOutButtonSpeed;
+
+	QImage m_imageCached;
+	Id m_tabId;
 };
 
 #endif	  // QT_GRAPHICS_VIEW_H

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -38,6 +38,7 @@
 #include "MessageTabSelect.h"
 #include "MessageWindowClosed.h"
 #include "MessageZoom.h"
+#include "MessageSaveAsImage.h"
 #include "QtAbout.h"
 #include "QtContextMenu.h"
 #include "QtFileDialog.h"
@@ -710,6 +711,19 @@ void QtMainWindow::forceRefresh()
 	MessageRefresh().refreshAll().dispatch();
 }
 
+void QtMainWindow::saveAsImage()
+{
+	QString filePath = QtFileDialog::showSaveFileDialog(this, tr("Save as Image"), FilePath(), 
+		"PNG (*.png);;JPEG (*.JPEG);;BMP Files (*.bmp)");
+	if (filePath.isNull())
+	{
+		return;
+	}
+	MessageSaveAsImage m(filePath);
+	m.setSchedulerId(TabId::currentTab());
+	m.dispatch();
+}
+
 void QtMainWindow::undo()
 {
 	MessageHistoryUndo().dispatch();
@@ -924,6 +938,8 @@ void QtMainWindow::setupEditMenu()
 		this,
 		&QtMainWindow::openSettings,
 		QKeySequence(Qt::CTRL + Qt::Key_Comma));
+
+	menu->addAction(tr("&Save as Image"), this, &QtMainWindow::saveAsImage, QKeySequence(Qt::SHIFT + Qt::CTRL + Qt::Key_S));
 }
 
 void QtMainWindow::setupViewMenu()

src/lib_gui/qt/window/QtMainWindow.h

@@ -150,6 +150,7 @@ public slots:
 	void updateRecentProjectsMenu();
 
 	void toggleView(View* view, bool fromMenu);
+	void saveAsImage();
 
 private slots:
 	void toggleShowDockWidgetTitleBars();