dash-frontend: popup manager

dash-frontend/src/util/desktop_finder.rs

@@ -1,7 +1,7 @@
 use gio::prelude::{AppInfoExt, IconExt};
 use gtk::traits::IconThemeExt;
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 #[allow(dead_code)] // TODO: remove this
 pub struct DesktopEntry {
 	pub exec_path: String,

dash-frontend/src/util/mod.rs

@@ -1 +1,2 @@
 pub mod desktop_finder;
+pub mod popup_manager;

dash-frontend/src/util/popup_manager.rs

@@ -0,0 +1,110 @@
+use std::{
+	cell::RefCell,
+	rc::{Rc, Weak},
+};
+
+use wgui::{
+	assets::AssetPath,
+	components::button::ComponentButton,
+	event::{EventAlterables, StyleSetRequest},
+	globals::WguiGlobals,
+	layout::{Layout, LayoutTask, WidgetID},
+	parser::{Fetchable, ParseDocumentParams, ParserState},
+	taffy::Display,
+};
+
+pub struct PopupManagerParams<'a> {
+	pub globals: WguiGlobals,
+	pub layout: &'a mut Layout,
+	pub parent_id: WidgetID,
+}
+
+struct MountedPopup {
+	#[allow(dead_code)]
+	state: ParserState,
+	id_root: WidgetID,
+}
+
+pub struct State {
+	popup_stack: Vec<MountedPopup>,
+}
+
+pub struct PopupManager {
+	pub state: Rc<RefCell<State>>,
+	globals: WguiGlobals,
+	parent_id: WidgetID,
+}
+
+pub struct PushPopupResult {
+	pub id_content: WidgetID,
+}
+
+impl State {
+	fn refresh_stack(&mut self, alterables: &mut EventAlterables) {
+		// show only the topmost popup
+		for (idx, popup) in self.popup_stack.iter().enumerate() {
+			alterables.set_style(
+				popup.id_root,
+				StyleSetRequest::Display(if idx == self.popup_stack.len() - 1 {
+					Display::Flex
+				} else {
+					Display::None
+				}),
+			);
+		}
+	}
+
+	fn pop_popup(&mut self, alterables: &mut EventAlterables) {
+		let Some(popup) = self.popup_stack.pop() else {
+			return;
+		};
+
+		alterables.tasks.push(LayoutTask::RemoveWidget(popup.id_root));
+		self.refresh_stack(alterables);
+	}
+}
+
+impl PopupManager {
+	pub fn new(params: PopupManagerParams) -> anyhow::Result<Self> {
+		Ok(Self {
+			globals: params.globals,
+			parent_id: params.parent_id,
+			state: Rc::new(RefCell::new(State {
+				popup_stack: Vec::new(),
+			})),
+		})
+	}
+
+	pub fn push_popup(&mut self, globals: WguiGlobals, layout: &mut Layout) -> anyhow::Result<PushPopupResult> {
+		let doc_params = &ParseDocumentParams {
+			globals,
+			path: AssetPath::BuiltIn("gui/view/popup_window.xml"),
+			extra: Default::default(),
+		};
+		let state = wgui::parser::parse_from_assets(doc_params, layout, self.parent_id)?;
+
+		let id_root = state.get_widget_id("root")?;
+		let id_content = state.get_widget_id("content")?;
+
+		let but_back = state.fetch_component_as::<ComponentButton>("but_back")?;
+
+		but_back.on_click({
+			let state = self.state.clone();
+			Box::new(move |common, _evt| {
+				state.borrow_mut().pop_popup(common.alterables);
+				Ok(())
+			})
+		});
+
+		let mounted_popup = MountedPopup { state, id_root };
+
+		let mut state = self.state.borrow_mut();
+		state.popup_stack.push(mounted_popup);
+
+		let mut c = layout.start_common();
+		state.refresh_stack(c.common().alterables);
+		c.finish()?;
+
+		Ok(PushPopupResult { id_content })
+	}
+}