1 files changed, 75 insertions, 0 deletions
diff --git a/src/grabs/move_grab.rs b/src/grabs/move_grab.rs
new file mode 100644
index 00000000..c9aacbec
--- /dev/null
+++ b/src/grabs/move_grab.rs
@@ -0,0 +1,75 @@
+use crate::Smallvil;
+use smithay::{
+    desktop::Window,
+    input::pointer::{
+        AxisFrame, ButtonEvent, GrabStartData as PointerGrabStartData, MotionEvent, PointerGrab,
+        PointerInnerHandle, RelativeMotionEvent,
+    },
+    reexports::wayland_server::protocol::wl_surface::WlSurface,
+    utils::{Logical, Point},
+};
+
+pub struct MoveSurfaceGrab {
+    pub start_data: PointerGrabStartData<Smallvil>,
+    pub window: Window,
+    pub initial_window_location: Point<i32, Logical>,
+}
+
+impl PointerGrab<Smallvil> for MoveSurfaceGrab {
+    fn motion(
+        &mut self,
+        data: &mut Smallvil,
+        handle: &mut PointerInnerHandle<'_, Smallvil>,
+        _focus: Option<(WlSurface, Point<i32, Logical>)>,
+        event: &MotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus
+        handle.motion(data, None, event);
+
+        let delta = event.location - self.start_data.location;
+        let new_location = self.initial_window_location.to_f64() + delta;
+        data.space
+            .map_element(self.window.clone(), new_location.to_i32_round(), true);
+    }
+
+    fn relative_motion(
+        &mut self,
+        data: &mut Smallvil,
+        handle: &mut PointerInnerHandle<'_, Smallvil>,
+        focus: Option<(WlSurface, Point<i32, Logical>)>,
+        event: &RelativeMotionEvent,
+    ) {
+        handle.relative_motion(data, focus, event);
+    }
+
+    fn button(
+        &mut self,
+        data: &mut Smallvil,
+        handle: &mut PointerInnerHandle<'_, Smallvil>,
+        event: &ButtonEvent,
+    ) {
+        handle.button(data, event);
+
+        // The button is a button code as defined in the
+        // Linux kernel's linux/input-event-codes.h header file, e.g. BTN_LEFT.
+        const BTN_LEFT: u32 = 0x110;
+
+        if !handle.current_pressed().contains(&BTN_LEFT) {
+            // No more buttons are pressed, release the grab.
+            handle.unset_grab(data, event.serial, event.time);
+        }
+    }
+
+    fn axis(
+        &mut self,
+        data: &mut Smallvil,
+        handle: &mut PointerInnerHandle<'_, Smallvil>,
+        details: AxisFrame,
+    ) {
+        handle.axis(data, details)
+    }
+
+    fn start_data(&self) -> &PointerGrabStartData<Smallvil> {
+        &self.start_data
+    }
+}