annotations: allow hiding with Alt+H

Src/Controller/ControllerAnnotations.cpp

@@ -107,7 +107,12 @@ void ControllerAnnotations::keyPressEvent(QKeyEvent *event)
 		case Qt::Key::Key_E:
 			actionQueued = ActionQueued::CreateEllipse;
 			break;
-		case Qt::Key::Key_Delete:
+		case Qt::Key::Key_H:
+			model->toggleHideAnnotations();
+			handled = true;
+			break;
+		case Qt::Key::Key_Delete: // Fallthrough.
+		case Qt::Key::Key_Backspace:
 			// Remove existing selected annotation at current frame.
 			if (model->removeSelection())
 			{

Src/Model/Annotations.cpp

@@ -353,6 +353,8 @@ bool Annotations::tryStartDragging(QPoint cursor)
 	bool annotationFound = false;
 	for (auto &annotation : annotations)
 	{
+		if (annotation->isHidden())
+			continue;
 		auto handle = annotation->getHandleForPosition(cursor);
 		if (!handle) // Nothing found?
 			continue;
@@ -372,6 +374,8 @@ bool Annotations::trySetText(QPoint cursor) {
 	selection.reset();
 	for (auto &annotation : annotations)
 	{
+		if (annotation->isHidden())
+			continue;
 		if (!(selection.handle = annotation->getHandleForPosition(cursor))) {
 			continue;
 		}
@@ -442,3 +446,23 @@ bool Annotations::updateSelectionEndFrame()
 		selectedAnnotation->startFrame = selectedAnnotation->endFrame;
 	return true;
 }
+
+void Annotations::toggleHideAnnotations()
+{
+	bool allWereHidden = true;
+	for (auto &annotation : annotations)
+	{
+		if (!annotation->isHidden())
+		{
+			allWereHidden = false;
+			annotation->setHidden(true);
+		}
+	}
+
+	if (allWereHidden)
+	{
+		for (auto &annotation : annotations)
+			annotation->setHidden(false);
+	}
+
+}
\ No newline at end of file

Src/Model/Annotations.h

@@ -104,12 +104,18 @@ public:
 		{
 			origin.update(currentFrameID, trackedComponents);
 		}
+		// Visually disable annotations and interactions with them.
+		// This will not be serialized.
+		void setHidden(bool hidden=true) { this->hidden = hidden; }
+		bool isHidden() const { return hidden; }
 	protected:
 		bool isHandleAtPosition(const QPoint &handle, const QPoint &pos);
 		bool isHandleAtPosition(const TrackedPoint &handle, const QPoint &pos)
 		{
 			return isHandleAtPosition(*handle, pos);
 		}
+	private:
+		bool hidden { false };
 	};
 
 	/// A label marks a position.
@@ -185,6 +191,8 @@ public:
 	size_t getCurrentFrame() const { return currentFrame; }
 	// Called when trajectories or displayed frames have changed.
 	void updateTrackedAnnotations(const QList<IModelTrackedComponent*> &trackedComponents);
+	// Used to hide existing annotations, or if all are hidden, unhide them.
+	void toggleHideAnnotations();
 private:
 	size_t currentFrame{ 0 };							/**< The current frame is required by the view. */
 

Src/View/AnnotationsView.cpp

@@ -47,6 +47,8 @@ void AnnotationsView::paint(QPainter * painter, const QStyleOptionGraphicsItem *
 	const auto currentFrame = model->getCurrentFrame();
 	for (auto &annotation : model->annotations)
 	{
+		if (annotation->isHidden())
+			continue;
 		// Is the current frame in the annotation's range?
 		if ((currentFrame >= annotation->startFrame && currentFrame <= annotation->endFrame)
 			|| (currentFrame == annotation->startFrame && annotation->startFrame > annotation->endFrame))