config: add resize action

src/config/handler.rs

@@ -2623,6 +2623,18 @@ impl ConfigProxyHandler {
         Ok(())
     }
 
+    fn handle_window_resize(
+        &self,
+        window: Window,
+        dx1: i32,
+        dy1: i32,
+        dx2: i32,
+        dy2: i32,
+    ) -> Result<(), CphError> {
+        self.get_window(window)?.tl_resize(dx1, dy1, dx2, dy2);
+        Ok(())
+    }
+
     fn handle_window_exists(&self, window: Window) {
         self.respond(Response::WindowExists {
             exists: self.get_window(window).is_ok(),
@@ -3381,6 +3393,15 @@ impl ConfigProxyHandler {
             ClientMessage::CreateVirtualOutput { name } => self.handle_create_virtual_output(name),
             ClientMessage::RemoveVirtualOutput { name } => self.handle_remove_virtual_output(name),
             ClientMessage::CleanLogsOlderThan { time } => self.handle_clean_logs_older_than(time),
+            ClientMessage::WindowResize {
+                window,
+                dx1,
+                dy1,
+                dx2,
+                dy2,
+            } => self
+                .handle_window_resize(window, dx1, dy1, dx2, dy2)
+                .wrn("window_resize")?,
         }
         Ok(())
     }

src/tree/toplevel.rs

@@ -73,6 +73,7 @@ pub trait ToplevelNode: ToplevelNodeBase {
     fn tl_set_float(&self, float: Option<&Rc<FloatNode>>);
     fn tl_mark_ancestor_fullscreen(&self, fullscreen: bool);
     fn tl_mark_fullscreen(&self, fullscreen: bool);
+    fn tl_resize(&self, dx1: i32, dy1: i32, dx2: i32, dy2: i32);
 }
 
 impl<T: ToplevelNodeBase> ToplevelNode for T {
@@ -250,6 +251,18 @@ impl<T: ToplevelNodeBase> ToplevelNode for T {
         self.tl_mark_ancestor_fullscreen(fullscreen);
         self.tl_mark_fullscreen_ext();
     }
+
+    fn tl_resize(&self, dx1: i32, dy1: i32, dx2: i32, dy2: i32) {
+        let Some(parent) = self.tl_data().parent.get() else {
+            return;
+        };
+        let pos = self.node_absolute_position();
+        let x1 = (dx1 != 0).then_some(pos.x1().saturating_add(dx1));
+        let y1 = (dy1 != 0).then_some(pos.y1().saturating_add(dy1));
+        let x2 = (dx2 != 0).then_some(pos.x2().saturating_add(dx2));
+        let y2 = (dy2 != 0).then_some(pos.y2().saturating_add(dy2));
+        parent.cnode_resize_child(self, x1, y1, x2, y2);
+    }
 }
 
 pub trait ToplevelNodeBase: Node {