Impl GetMousePosition Capture/ReleaseMouse of xcb window.

2 files changed, 25 insertions, 4 deletions

diff --git a/include/cru/platform/gui/xcb/Window.h b/include/cru/platform/gui/xcb/Window.h
index 346cbd55..d9c2e8da 100644
--- a/include/cru/platform/gui/xcb/Window.h
+++ b/include/cru/platform/gui/xcb/Window.h
@@ -44,11 +44,10 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
 
   bool RequestFocus() override;
 
-  // Relative to client lefttop.
-  virtual Point GetMousePosition() = 0;
+  Point GetMousePosition() override;
 
-  virtual bool CaptureMouse() = 0;
-  virtual bool ReleaseMouse() = 0;
+  bool CaptureMouse() override;
+  bool ReleaseMouse() override;
 
   virtual void SetCursor(std::shared_ptr<ICursor> cursor) = 0;
 
diff --git a/src/platform/gui/xcb/Window.cpp b/src/platform/gui/xcb/Window.cpp
index 3e5c7f7b..4d28e6e6 100644
--- a/src/platform/gui/xcb/Window.cpp
+++ b/src/platform/gui/xcb/Window.cpp
@@ -238,6 +238,28 @@ bool XcbWindow::RequestFocus() {
   return true;
 }
 
+Point XcbWindow::GetMousePosition() {
+  auto window = xcb_window_.value_or(application_->GetFirstXcbScreen()->root);
+  auto cookie = xcb_query_pointer(application_->GetXcbConnection(), window);
+  auto reply = xcb_query_pointer_reply(application_->GetXcbConnection(), cookie,
+                                       nullptr);
+  return Point(reply->win_x, reply->win_y);
+}
+
+bool XcbWindow::CaptureMouse() {
+  if (!xcb_window_) return false;
+  xcb_grab_pointer(application_->GetXcbConnection(), FALSE, *xcb_window_, 0,
+                   XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, XCB_WINDOW_NONE,
+                   XCB_CURSOR_NONE, XCB_CURRENT_TIME);
+  return true;
+}
+
+bool XcbWindow::ReleaseMouse() {
+  if (!xcb_window_) return false;
+  xcb_ungrab_pointer(application_->xcb_connection_, XCB_CURRENT_TIME);
+  return true;
+}
+
 std::unique_ptr<graphics::IPainter> XcbWindow::BeginPaint() {
   assert(cairo_surface_);