Implement outline view mode (#401)

* Created wasm binding to action's of the radio buttons which control the view mode
Added entry to DocumentMessage Enum

* draw in wireframe mode by changing parameters on each shape
added functions/changed behavior to do as above
not working yet
   - newly added shapes should be drawn in wireframe
   - setting fill to "none" on a path does not only draw an outline
      - maybe the stroke width is 0?

* Wire frame view mostly functional for ellipses
   - Need to implement for all shapes
   - BUG: shapes don't immediatley update upon changing view-mode

* Fixed: active document now updates after view mode swap

* The Pros:
   - wire frame mode effects all shapes correctly

The Cons:
   - wire frame mode effects everything, including things that maybe shouldn't be, like select boxes and pen lines

* wire frame view no longer effects overlay layers

* Fixed: While in wireframe view the pen tool will draw regular thickness lines.

* some commenting

* Fixed potential bug:
   In layer/file system with a Folder layer with a sub-layer that is also
   a Folder cache_dirty must be set in order for all shapes to update properly

* refactored code to use ViewMode enum names throughout

* Changed: All wireframe lines are blank
cargo fmt

* Wireframe thickness doesn't change as a result of zooming
   - Added DocumentMessage::ReRenderDocument, which marks layers as dirty and renders with the updated render-string
   - All "zoom" messages in the movement_handler send a re-render message
   - while in wireframe view, the "render-transform" of all shapes includes the root layer transform

Added getter/setter methods for graphene::Document::view_mode

* cargo fmt

* wireframe now has proper thickness after "Zoom Canvas to Fit all" action

* Refactored
   - Changed FrontendMessage::UpdateCanvas to RenderDocument message to allow for lazy evaluation
   - Created DocumentOperation::SetViewMode to be more consistent with existing code
   - removed log statement
   - Added constants for empty fill and thin-black stroke

* cargo fmt

* Removed ReRenderDocument message

* cargo fmt

* Fixes as suggested by TrueDoctor

* clean up merge
cargo fmt

* Refactor:
   moved view_mode to DocumentMessageHandler

* Polishing

* changed those two comments

* Remove unknown todo comment

Co-authored-by: Keavon Chambers <keavon@keavon.com>

graphene/src/layers/mod.rs

@@ -1,4 +1,5 @@
 pub mod style;
+use style::ViewMode;
 
 use glam::DAffine2;
 use glam::{DMat2, DVec2};
@@ -18,7 +19,7 @@ use serde::{Deserialize, Serialize};
 use std::fmt::Write;
 
 pub trait LayerData {
-	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>);
+	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>, view_mode: ViewMode);
 	fn intersects_quad(&self, quad: Quad, path: &mut Vec<LayerId>, intersections: &mut Vec<Vec<LayerId>>);
 	fn bounding_box(&self, transform: glam::DAffine2) -> Option<[DVec2; 2]>;
 }
@@ -46,12 +47,14 @@ impl LayerDataType {
 }
 
 impl LayerData for LayerDataType {
-	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>) {
-		self.inner_mut().render(svg, transforms)
+	fn render(&mut self, svg: &mut String, transforms: &mut Vec<glam::DAffine2>, view_mode: ViewMode) {
+		self.inner_mut().render(svg, transforms, view_mode)
 	}
+
 	fn intersects_quad(&self, quad: Quad, path: &mut Vec<LayerId>, intersections: &mut Vec<Vec<LayerId>>) {
 		self.inner().intersects_quad(quad, path, intersections)
 	}
+
 	fn bounding_box(&self, transform: glam::DAffine2) -> Option<[DVec2; 2]> {
 		self.inner().bounding_box(transform)
 	}
@@ -102,14 +105,14 @@ impl Layer {
 		}
 	}
 
-	pub fn render(&mut self, transforms: &mut Vec<DAffine2>) -> &str {
+	pub fn render(&mut self, transforms: &mut Vec<DAffine2>, view_mode: ViewMode) -> &str {
 		if !self.visible {
 			return "";
 		}
 		if self.cache_dirty {
 			transforms.push(self.transform);
 			self.thumbnail_cache.clear();
-			self.data.render(&mut self.thumbnail_cache, transforms);
+			self.data.render(&mut self.thumbnail_cache, transforms, if self.overlay { ViewMode::Normal } else { view_mode });
 
 			self.cache.clear();
 			let _ = writeln!(self.cache, r#"<g transform="matrix("#);