Add responses in document for layer system (#91)

core/document/src/response.rs

@@ -0,0 +1,47 @@
+use crate::LayerId;
+use std::fmt;
+
+#[derive(Debug, Clone)]
+pub struct LayerPanelEntry {
+	pub name: String,
+	pub visible: bool,
+	pub layer_type: LayerType,
+}
+
+#[derive(Debug, Clone)]
+pub enum LayerType {
+	Folder,
+	Shape,
+}
+
+impl fmt::Display for LayerType {
+	fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+		let name = match self {
+			LayerType::Folder => "folder",
+			LayerType::Shape => "shape",
+		};
+
+		formatter.write_str(name)
+	}
+}
+
+#[derive(Debug, Clone)]
+#[repr(C)]
+// TODO - Make Copy when possible
+pub enum DocumentResponse {
+	UpdateCanvas { document: String },
+	CollapseFolder { path: Vec<LayerId> },
+	ExpandFolder { path: Vec<LayerId>, children: Vec<LayerPanelEntry> },
+}
+
+impl fmt::Display for DocumentResponse {
+	fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+		let name = match self {
+			DocumentResponse::UpdateCanvas { .. } => "UpdateCanvas",
+			DocumentResponse::CollapseFolder { .. } => "CollapseFolder",
+			DocumentResponse::ExpandFolder { .. } => "ExpandFolder",
+		};
+
+		formatter.write_str(name)
+	}
+}