Add 'View > Zoom to Selected' action (#1047)

* implements pan/zoom to the selected layer(s) on Period

Relates to #989

* adds layer menu support: Layer -> Center View on Selection

* relocate Center View on Selection to View -> Zoom to selected

* use the proper menu title

editor/src/messages/input_mapper/default_mapping.rs

@@ -280,6 +280,7 @@ pub fn default_mapping() -> Mapping {
 		entry!(KeyDown(PageDown); modifiers=[Shift], action_dispatch=NavigationMessage::TranslateCanvasByViewportFraction { delta: DVec2::new(-1., 0.) }),
 		entry!(KeyDown(PageUp); action_dispatch=NavigationMessage::TranslateCanvasByViewportFraction { delta: DVec2::new(0., 1.) }),
 		entry!(KeyDown(PageDown); action_dispatch=NavigationMessage::TranslateCanvasByViewportFraction { delta: DVec2::new(0., -1.) }),
+		entry!(KeyDown(Period); action_dispatch=NavigationMessage::FitViewportToSelection),
 		//
 		// PortfolioMessage
 		entry!(KeyDown(KeyO); modifiers=[Accel], action_dispatch=PortfolioMessage::OpenDocument),

editor/src/messages/portfolio/document/document_message_handler.rs

@@ -186,7 +186,8 @@ impl MessageHandler<DocumentMessage, (u64, &InputPreprocessorMessageHandler, &Pe
 			}
 			#[remain::unsorted]
 			Navigation(message) => {
-				self.navigation_handler.process_message(message, responses, (&self.document_legacy, ipp));
+				self.navigation_handler
+					.process_message(message, responses, (&self.document_legacy, ipp, self.selected_visible_layers_bounding_box(&render_data)));
 			}
 			#[remain::unsorted]
 			Overlays(message) => {

editor/src/messages/portfolio/document/navigation/navigation_message.rs

@@ -17,6 +17,7 @@ pub enum NavigationMessage {
 		padding_scale_factor: Option<f32>,
 		prevent_zoom_past_100: bool,
 	},
+	FitViewportToSelection,
 	IncreaseCanvasZoom {
 		center_on_mouse: bool,
 	},

editor/src/messages/portfolio/document/navigation/navigation_message_handler.rs

@@ -1,4 +1,7 @@
-use crate::consts::{VIEWPORT_ROTATE_SNAP_INTERVAL, VIEWPORT_SCROLL_RATE, VIEWPORT_ZOOM_LEVELS, VIEWPORT_ZOOM_MOUSE_RATE, VIEWPORT_ZOOM_SCALE_MAX, VIEWPORT_ZOOM_SCALE_MIN, VIEWPORT_ZOOM_WHEEL_RATE};
+use crate::consts::{
+	VIEWPORT_ROTATE_SNAP_INTERVAL, VIEWPORT_SCROLL_RATE, VIEWPORT_ZOOM_LEVELS, VIEWPORT_ZOOM_MOUSE_RATE, VIEWPORT_ZOOM_SCALE_MAX, VIEWPORT_ZOOM_SCALE_MIN, VIEWPORT_ZOOM_TO_FIT_PADDING_SCALE_FACTOR,
+	VIEWPORT_ZOOM_WHEEL_RATE,
+};
 use crate::messages::frontend::utility_types::MouseCursorIcon;
 use crate::messages::input_mapper::utility_types::input_keyboard::{Key, KeysGroup};
 use crate::messages::input_mapper::utility_types::input_mouse::{ViewportBounds, ViewportPosition};
@@ -48,9 +51,9 @@ impl Default for NavigationMessageHandler {
 	}
 }
 
-impl MessageHandler<NavigationMessage, (&Document, &InputPreprocessorMessageHandler)> for NavigationMessageHandler {
+impl MessageHandler<NavigationMessage, (&Document, &InputPreprocessorMessageHandler, Option<[DVec2; 2]>)> for NavigationMessageHandler {
 	#[remain::check]
-	fn process_message(&mut self, message: NavigationMessage, responses: &mut VecDeque<Message>, (document, ipp): (&Document, &InputPreprocessorMessageHandler)) {
+	fn process_message(&mut self, message: NavigationMessage, responses: &mut VecDeque<Message>, (document, ipp, selection_bounds): (&Document, &InputPreprocessorMessageHandler, Option<[DVec2; 2]>)) {
 		use NavigationMessage::*;
 
 		#[remain::sorted]
@@ -91,6 +94,18 @@ impl MessageHandler<NavigationMessage, (&Document, &InputPreprocessorMessageHand
 				responses.push_back(PortfolioMessage::UpdateDocumentWidgets.into());
 				self.create_document_transform(&ipp.viewport_bounds, responses);
 			}
+			FitViewportToSelection => {
+				if let Some(bounds) = selection_bounds {
+					responses.push_back(
+						FitViewportToBounds {
+							bounds,
+							padding_scale_factor: Some(VIEWPORT_ZOOM_TO_FIT_PADDING_SCALE_FACTOR),
+							prevent_zoom_past_100: false,
+						}
+						.into(),
+					)
+				}
+			}
 			IncreaseCanvasZoom { center_on_mouse } => {
 				let new_scale = *VIEWPORT_ZOOM_LEVELS.iter().find(|scale| **scale > self.zoom).unwrap_or(&self.zoom);
 				if center_on_mouse {
@@ -272,6 +287,7 @@ impl MessageHandler<NavigationMessage, (&Document, &InputPreprocessorMessageHand
 			WheelCanvasTranslate,
 			TranslateCanvas,
 			TranslateCanvasByViewportFraction,
+			FitViewportToSelection,
 		);
 
 		if self.panning || self.tilting || self.zooming {

editor/src/messages/portfolio/menu_bar/menu_bar_message_handler.rs

@@ -222,6 +222,12 @@ impl PropertyHolder for MenuBarMessageHandler {
 			MenuBarEntry::new_root(
 				"View".into(),
 				MenuBarEntryChildren(vec![vec![
+					MenuBarEntry {
+						label: "Zoom to Selected".into(),
+						shortcut: action_keys!(NavigationMessageDiscriminant::FitViewportToSelection),
+						action: MenuBarEntry::create_action(|_| NavigationMessage::FitViewportToSelection.into()),
+						..MenuBarEntry::default()
+					},
 					MenuBarEntry {
 						label: "Zoom to Fit".into(),
 						shortcut: action_keys!(DocumentMessageDiscriminant::ZoomCanvasToFitAll),