wl_surface: move dnd logic to separate module

src/ifs/wl_surface/dnd_icon.rs

@@ -0,0 +1,55 @@
+use {
+    crate::{
+        ifs::{wl_seat::WlSeatGlobal, wl_surface::WlSurface},
+        rect::Rect,
+        renderer::Renderer,
+    },
+    std::rc::Rc,
+};
+
+pub struct DndIcon {
+    pub(super) surface: Rc<WlSurface>,
+    pub(super) seat: Rc<WlSeatGlobal>,
+}
+
+impl DndIcon {
+    pub fn surface(&self) -> &Rc<WlSurface> {
+        &self.surface
+    }
+
+    fn update_visible(&self) {
+        let is_visible =
+            self.surface.dnd_icons.is_not_empty() && self.surface.client.state.root_visible();
+        self.surface.set_visible(is_visible);
+    }
+
+    pub fn enable(self: &Rc<Self>) {
+        self.surface.dnd_icons.insert(self.seat.id(), self.clone());
+        self.update_visible();
+    }
+
+    pub fn disable(self: &Rc<Self>) {
+        self.surface.dnd_icons.remove(&self.seat.id());
+        self.update_visible();
+    }
+
+    pub fn surface_position(&self, seat_x: i32, seat_y: i32) -> (i32, i32) {
+        (
+            seat_x + self.surface.buf_x.get(),
+            seat_y + self.surface.buf_y.get(),
+        )
+    }
+
+    fn extents(&self, x: i32, y: i32) -> Rect {
+        let (x, y) = self.surface_position(x, y);
+        self.surface.extents.get().move_(x, y)
+    }
+
+    pub fn render(&self, renderer: &mut Renderer<'_>, cursor_rect: &Rect, x: i32, y: i32) {
+        let extents = self.extents(x, y);
+        if extents.intersects(&cursor_rect) {
+            let (x, y) = cursor_rect.translate(extents.x1(), extents.y1());
+            renderer.render_surface(&self.surface, x, y, None);
+        }
+    }
+}