feat: support topmost.(windows&linux)

bitsdojo_window_linux/lib/src/native_api.dart

@@ -93,6 +93,11 @@ typedef Void TSetWindowTitle(IntPtr window, Pointer<Utf8> title);
 typedef DSetWindowTitle = void Function(int window, Pointer<Utf8> title);
 final DSetWindowTitle setWindowTitle = _theAPI.ref.setWindowTitle.asFunction();
 
+// setTopmost
+typedef Void TSetTopmost(IntPtr window, Int32 topmost);
+typedef DSetTopmost = void Function(int window, int topmost);
+final DSetTopmost setTopmost = _theAPI.ref.setTopMost.asFunction();
+
 class BDWAPI extends Struct {
   external Pointer<NativeFunction<TGetAppWindowHandle>> getAppWindowHandle;
   external Pointer<NativeFunction<TGetScreenRect>> getScreenRect;
@@ -110,6 +115,7 @@ class BDWAPI extends Struct {
   external Pointer<NativeFunction<TMaximizeWindow>> maximizeWindow;
   external Pointer<NativeFunction<TUnmaximizeWindow>> unmaximizeWindow;
   external Pointer<NativeFunction<TSetWindowTitle>> setWindowTitle;
+  external Pointer<NativeFunction<TSetTopmost>> setTopMost;
 }
 
 typedef Pointer<BDWAPI> TBitsdojoWindowAPI();

bitsdojo_window_linux/lib/src/window.dart

@@ -201,6 +201,12 @@ class GtkWindow extends DesktopWindow {
         handle!, _maxSize!.width.toInt(), _maxSize!.height.toInt());
   }
 
+  @override
+  set topmost(bool topmost) {
+    if (!isValidHandle(handle, "set topmost")) return;
+    native.setTopmost(handle!, topmost ? 1 : 0);
+  }
+
   @override
   set size(Size newSize) {
     if (!isValidHandle(handle, "set size")) return;

bitsdojo_window_linux/linux/api.cpp

@@ -18,7 +18,8 @@ BDWAPI _theAPI = {
     minimizeWindow,
     maximizeWindow,
     unmaximizeWindow,
-    setWindowTitle
+    setWindowTitle,
+    setTopmost
 };
 
 } // namespace bitsdojo_window

bitsdojo_window_linux/linux/api.h

@@ -26,6 +26,7 @@ typedef struct _BDWAPI {
     TMaximizeWindow maximizeWindow;
     TUnmaximizeWindow unmaximizeWindow;
     TSetWindowTitle setWindowTitle;
+    TSetTopmost setTopmost;
 } BDWAPI;
 
 }  // namespace bitsdojo_window

bitsdojo_window_linux/linux/api_impl.cpp

@@ -209,4 +209,8 @@ void setWindowTitle(GtkWindow* window, const gchar* title) {
     g_idle_add_full(G_PRIORITY_HIGH_IDLE, setWindowTitleProc, params, NULL);
 }
 
+void setTopmost(GtkWindow* window, int topmost){
+    gtk_window_set_keep_above(window,topmost == 1 ? TRUE : FALSE);
+}
+
 }  // namespace bitsdojo_window

bitsdojo_window_linux/linux/api_impl.h

@@ -49,6 +49,9 @@ namespace bitsdojo_window {
 
     typedef void (*TSetWindowTitle)(GtkWindow*, const gchar *);
     void setWindowTitle(GtkWindow* window, const gchar *title);
+
+    typedef void (*TSetTopmost)(GtkWindow*, int);
+    void setTopmost(GtkWindow* window,int topmost);
 }
 
 #endif // _BDW_API_IMPL_

bitsdojo_window_macos/lib/src/window.dart

@@ -238,4 +238,10 @@ class MacOSWindow extends DesktopWindow {
     if (!isValidHandle(handle, "maximizeOrRestore")) return;
     maximizeOrRestoreWindow(handle!);
   }
+
+  @override
+  set topmost(bool topmost) {
+    // TODO: implement topmost
+    throw UnimplementedError();
+  }
 }

bitsdojo_window_platform_interface/lib/window.dart

@@ -18,6 +18,8 @@ abstract class DesktopWindow {
   set minSize(Size? newSize);
   set maxSize(Size? newSize);
 
+  set topmost(bool topmost);
+
   Alignment? get alignment;
   set alignment(Alignment? newAlignment);
 

bitsdojo_window_platform_interface/lib/window_not_implemented.dart

@@ -39,6 +39,10 @@ class NotImplementedWindow extends DesktopWindow {
     throw UnimplementedError('maxSize setter has not been implemented.');
   }
 
+  set topmost(bool toomost) {
+    throw UnimplementedError('topmost setter has not been implemented.');
+  }
+
   Alignment get alignment {
     throw UnimplementedError('alignment getter has not been implemented.');
   }

bitsdojo_window_windows/lib/src/window.dart

@@ -293,4 +293,11 @@ class WinWindow extends WinDesktopWindow {
   void startDragging() {
     BitsdojoWindowPlatform.instance.dragAppWindow();
   }
+
+  @override
+  set topmost(bool topmost) {
+    if (!isValidHandle(handle, "topmost")) return;
+
+    PostMessage(handle!, WM_USER + 1, topmost ? 1 : 0, 0);
+  }
 }