Impl RequestFocus of xcb window.

3 files changed, 10 insertions, 1 deletions

diff --git a/include/cru/platform/gui/Window.h b/include/cru/platform/gui/Window.h
index 742ef798..f877545e 100644
--- a/include/cru/platform/gui/Window.h
+++ b/include/cru/platform/gui/Window.h
@@ -72,6 +72,8 @@ struct INativeWindow : virtual IPlatformResource {
   // The lefttop of the rect is relative to screen lefttop.
   virtual void SetWindowRect(const Rect& rect) = 0;
 
+  // Return true if window gained the focus. But the return value should be
+  // ignored, since it does not guarantee anything.
   virtual bool RequestFocus() = 0;
 
   // Relative to client lefttop.
diff --git a/include/cru/platform/gui/xcb/Window.h b/include/cru/platform/gui/xcb/Window.h
index ba4798a5..346cbd55 100644
--- a/include/cru/platform/gui/xcb/Window.h
+++ b/include/cru/platform/gui/xcb/Window.h
@@ -42,7 +42,7 @@ class XcbWindow : public XcbResource, public virtual INativeWindow {
   Rect GetWindowRect() override;
   void SetWindowRect(const Rect& rect) override;
 
-  virtual bool RequestFocus() = 0;
+  bool RequestFocus() override;
 
   // Relative to client lefttop.
   virtual Point GetMousePosition() = 0;
diff --git a/src/platform/gui/xcb/Window.cpp b/src/platform/gui/xcb/Window.cpp
index 9f2448d1..3e5c7f7b 100644
--- a/src/platform/gui/xcb/Window.cpp
+++ b/src/platform/gui/xcb/Window.cpp
@@ -231,6 +231,13 @@ void XcbWindow::SetWindowRect(const Rect &rect) {
   SetClientRect(real_rect);
 }
 
+bool XcbWindow::RequestFocus() {
+  if (!xcb_window_) return false;
+  xcb_set_input_focus(application_->GetXcbConnection(), XCB_NONE, *xcb_window_,
+                      XCB_CURRENT_TIME);
+  return true;
+}
+
 std::unique_ptr<graphics::IPainter> XcbWindow::BeginPaint() {
   assert(cairo_surface_);