Add x11 support.

src/native/linux_x11.rs

@@ -243,6 +243,27 @@ impl X11Display {
         (self.libx11.XFlush)(self.display);
     }
 
+    unsafe fn set_window_position(&mut self, window: Window, new_x: u32, new_y: u32) {
+        (self.libx11.XMoveWindow)(self.display, window, new_x, new_y);
+        (self.libx11.XFlush)(self.display);
+    }
+
+    unsafe fn get_window_position(&mut self, window: Window) -> (u32, u32) {
+        let mut x = 0;
+        let mut y = 0;
+        (self.libx11.XTranslateCoordinates)(
+            self.display,
+            window,
+            self.root,
+            0,
+            0,
+            &mut x,
+            &mut y,
+            std::ptr::null_mut(),
+        );
+        (x, y)
+    }
+
     fn show_mouse(&mut self, shown: bool) {
         unsafe {
             if shown {
@@ -324,6 +345,9 @@ impl X11Display {
                     new_width,
                     new_height,
                 } => self.set_window_size(self.window, new_width as _, new_height as _),
+                SetWindowPosition { new_x, new_y } => {
+                    self.set_window_position(self.window, new_x as _, new_y as _)
+                }
                 SetFullscreen(fullscreen) => self.set_fullscreen(self.window, fullscreen),
                 ShowKeyboard(show) => {
                     eprintln!("Not implemented for X11")
@@ -366,6 +390,7 @@ where
 
     (display.libx11.XFlush)(display.display);
 
+    // Get width and height
     let (w, h) = display
         .libx11
         .query_window_size(display.display, display.window);
@@ -400,6 +425,13 @@ where
             display.process_event(&mut xevent, &mut *event_handler);
         }
 
+        // update screen_position if window was moved
+        let (x, y) = display.get_window_position(display.window);
+        let mut d = crate::native_display().try_lock().unwrap();
+        if d.screen_position.0 != x || d.screen_position.1 != y {
+            d.screen_position = (x, y);
+        }
+
         event_handler.update();
         event_handler.draw();