Add "Zoom to fit modules" to menu bar and "Zoom to fit" to module context menu, with key commands F4 and Ctrl+F4.

include/app/RackScrollWidget.hpp

@@ -29,6 +29,10 @@ struct RackScrollWidget : ui::ScrollWidget {
 	*/
 	void setZoom(float zoom);
 	void setZoom(float zoom, math::Vec pivot);
+	/** Sets offset and zoom to fit module bounding box to view. */
+	void zoomToModules();
+	/** Sets offset and zoom to fit given bound (in module coordinates) to view. */
+	void zoomToBound(math::Rect bound);
 
 	void step() override;
 	void draw(const DrawArgs& args) override;

src/app/MenuBar.cpp

@@ -420,6 +420,14 @@ struct ViewButton : MenuButton {
 			}
 		}));
 
+		ZoomSlider* zoomSlider = new ZoomSlider;
+		zoomSlider->box.size.x = 250.0;
+		menu->addChild(zoomSlider);
+
+		menu->addChild(createMenuItem("Zoom to fit modules", "F4", [=]() {
+			APP->scene->rackScroll->zoomToModules();
+		}));
+
 		menu->addChild(new ui::MenuSeparator);
 		menu->addChild(createMenuLabel("Appearance"));
 
@@ -441,10 +449,6 @@ struct ViewButton : MenuButton {
 		menu->addChild(createBoolPtrMenuItem("Show tooltips", "", &settings::tooltips));
 
 		// Various sliders
-		ZoomSlider* zoomSlider = new ZoomSlider;
-		zoomSlider->box.size.x = 250.0;
-		menu->addChild(zoomSlider);
-
 		CableOpacitySlider* cableOpacitySlider = new CableOpacitySlider;
 		cableOpacitySlider->box.size.x = 250.0;
 		menu->addChild(cableOpacitySlider);

src/app/ModuleWidget.cpp

@@ -360,6 +360,10 @@ void ModuleWidget::onHoverKey(const HoverKeyEvent& e) {
 				system::openBrowser(manualUrl);
 			e.consume(this);
 		}
+		if (e.key == GLFW_KEY_F4 && (e.mods & RACK_MOD_MASK) == RACK_MOD_CTRL) {
+			APP->scene->rackScroll->zoomToBound(getBox());
+			e.consume(this);
+		}
 	}
 
 	if (e.isConsumed())
@@ -1111,6 +1115,13 @@ void ModuleWidget::createContextMenu() {
 		weakThis->removeAction();
 	}, false, true));
 
+	// Zoom to fit
+	menu->addChild(createMenuItem("Zoom to fit", RACK_MOD_CTRL_NAME "+F4", [=]() {
+		if (!weakThis)
+			return;
+		APP->scene->rackScroll->zoomToBound(weakThis->getBox());
+	}));
+
 	appendContextMenu(menu);
 }
 

src/app/RackScrollWidget.cpp

@@ -71,6 +71,24 @@ void RackScrollWidget::setZoom(float zoom, math::Vec pivot) {
 }
 
 
+void RackScrollWidget::zoomToModules() {
+	widget::Widget* moduleContainer = rackWidget->getModuleContainer();
+	math::Rect bound = moduleContainer->getChildrenBoundingBox();
+	zoomToBound(bound);
+}
+
+
+void RackScrollWidget::zoomToBound(math::Rect bound) {
+	if (!bound.pos.isFinite())
+		return;
+	bound = bound.grow(math::Vec(24, 24));
+	math::Vec size = getSize();
+	float zoom = std::min(size.x / bound.size.x, size.y / bound.size.y);
+	offset = bound.getCenter() * zoom - size / 2;
+	zoomWidget->setZoom(zoom);
+}
+
+
 void RackScrollWidget::step() {
 	float zoom = getZoom();
 

src/app/Scene.cpp

@@ -232,6 +232,10 @@ void Scene::onHoverKey(const HoverKeyEvent& e) {
 			settings::cpuMeter ^= true;
 			e.consume(this);
 		}
+		if (e.key == GLFW_KEY_F4 && (e.mods & RACK_MOD_MASK) == 0) {
+			APP->scene->rackScroll->zoomToModules();
+			e.consume(this);
+		}
 		if (e.key == GLFW_KEY_F11 && (e.mods & RACK_MOD_MASK) == 0) {
 			APP->window->setFullScreen(!APP->window->isFullScreen());
 			// The MenuBar will be hidden when the mouse moves over the RackScrollWidget.