Implement scratchpad window toggling

src/tree/toplevel.rs

@@ -1323,3 +1323,64 @@ pub fn toplevel_set_workspace(state: &Rc<State>, tl: Rc<dyn ToplevelNode>, ws: &
         tl.tl_set_fullscreen(true, Some(ws.clone()));
     }
 }
+
+pub struct ScratchpadToplevelState {
+    pub floating: bool,
+    pub fullscreen: bool,
+    pub workspace: Option<Rc<WorkspaceNode>>,
+}
+
+pub fn toplevel_hide_for_scratchpad(tl: Rc<dyn ToplevelNode>) -> Option<ScratchpadToplevelState> {
+    if tl.node_is_placeholder() {
+        return None;
+    }
+    let data = tl.tl_data();
+    let scratchpad_state = ScratchpadToplevelState {
+        floating: data.parent_is_float.get(),
+        fullscreen: data.is_fullscreen.get(),
+        workspace: data.workspace.get(),
+    };
+    if data.is_fullscreen.get() {
+        tl.clone().tl_set_fullscreen(false, None);
+        if data.is_fullscreen.get() {
+            return None;
+        }
+    }
+    let parent = data.parent.get()?;
+    let kb_foci = collect_kb_foci(tl.clone());
+    parent.cnode_remove_child2(&*tl, true);
+    data.parent.take();
+    data.float.take();
+    if data.parent_is_float.replace(false) {
+        data.property_changed(TL_CHANGED_FLOATING);
+    }
+    if data.workspace.take().is_some() {
+        data.property_changed(TL_CHANGED_WORKSPACE);
+    }
+    tl.tl_set_visible(false);
+    if let Some(workspace) = &scratchpad_state.workspace {
+        for seat in kb_foci {
+            workspace
+                .clone()
+                .node_do_focus(&seat, Direction::Unspecified);
+        }
+    }
+    Some(scratchpad_state)
+}
+
+pub fn toplevel_restore_from_scratchpad(
+    state: &Rc<State>,
+    tl: Rc<dyn ToplevelNode>,
+    ws: &Rc<WorkspaceNode>,
+    scratchpad_state: &ScratchpadToplevelState,
+) {
+    if scratchpad_state.floating {
+        let (width, height) = tl.tl_data().float_size(ws);
+        state.map_floating(tl.clone(), width, height, ws, None);
+    } else {
+        state.map_tiled_on(tl.clone(), ws);
+    }
+    if scratchpad_state.fullscreen && ws.fullscreen.is_none() {
+        tl.tl_set_fullscreen(true, Some(ws.clone()));
+    }
+}