Implement bounding box for selected layers (#349)

* Implement bounding box for selected layers

* Add shift modifier for multi selection

graphene/src/document.rs

@@ -33,7 +33,7 @@ fn split_path(path: &[LayerId]) -> Result<(&[LayerId], LayerId), DocumentError>
 }
 
 impl Document {
-	pub fn with_content(serialized_content: &String) -> Result<Self, DocumentError> {
+	pub fn with_content(serialized_content: &str) -> Result<Self, DocumentError> {
 		serde_json::from_str(serialized_content).map_err(|e| DocumentError::InvalidFile(e.to_string()))
 	}
 
@@ -289,8 +289,10 @@ impl Document {
 			Operation::AddBoundingBox { path, transform, style } => {
 				let mut rect = Shape::rectangle(*style);
 				rect.render_index = -1;
-				self.set_layer(path, Layer::new(LayerDataType::Shape(rect), *transform), -1)?;
-				Some(vec![DocumentResponse::DocumentChanged])
+				let mut layer = Layer::new(LayerDataType::Shape(rect), *transform);
+				layer.overlay = true;
+				self.set_layer(path, layer, -1)?;
+				Some(vec![DocumentResponse::DocumentChanged, DocumentResponse::CreatedLayer { path: path.clone() }])
 			}
 			Operation::AddShape {
 				path,

graphene/src/layers/mod.rs

@@ -83,6 +83,7 @@ pub struct Layer {
 	pub cache_dirty: bool,
 	pub blend_mode: BlendMode,
 	pub opacity: f64,
+	pub overlay: bool,
 }
 
 impl Layer {
@@ -97,6 +98,7 @@ impl Layer {
 			cache_dirty: true,
 			blend_mode: BlendMode::Normal,
 			opacity: 1.,
+			overlay: false,
 		}
 	}
 
@@ -128,7 +130,7 @@ impl Layer {
 	}
 
 	pub fn intersects_quad(&self, quad: Quad, path: &mut Vec<LayerId>, intersections: &mut Vec<Vec<LayerId>>) {
-		if !self.visible {
+		if !self.visible || self.overlay {
 			return;
 		}
 		let transformed_quad = self.transform.inverse() * quad;
@@ -166,6 +168,7 @@ impl Clone for Layer {
 			cache_dirty: true,
 			blend_mode: self.blend_mode,
 			opacity: self.opacity,
+			overlay: self.overlay,
 		}
 	}
 }