Fix Keyboard Navigation and Xaml Island focus issues for KBM (dev/build-features) (#2429)

* Added XamlBridge code and implemented keyboard focus navigation for xaml islands

* Change global pointer to static

src/modules/keyboardmanager/ui/XamlBridge.h

@@ -0,0 +1,72 @@
+#pragma once
+#include <unknwn.h> // To enable support for non-WinRT interfaces, unknwn.h must be included before any C++/WinRT headers.
+#include <winrt/Windows.System.h>
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.Foundation.Collections.h>
+#include <winrt/Windows.UI.Xaml.Hosting.h>
+#include <winrt/Windows.UI.Xaml.Markup.h>
+#include <windows.ui.xaml.hosting.desktopwindowxamlsource.h>
+#include <windowsx.h>
+
+// This class is used for handling XAML Island operations
+class XamlBridge
+{
+public:
+    // Function to run the message loop for the xaml island window
+    int MessageLoop();
+
+    // Constructor
+    XamlBridge(HWND parent) :
+        parentWindow(parent), lastFocusRequestId(winrt::guid())
+    {
+    }
+
+    // Function to initialise the xaml source object
+    HWND InitDesktopWindowsXamlSource(winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource);
+
+    // Function to close and delete all the xaml source objects
+    void ClearXamlIslands();
+
+    // Message Handler function for Xaml Island windows
+    LRESULT MessageHandler(UINT const message, WPARAM const wParam, LPARAM const lParam) noexcept;
+
+private:
+    // Stores the last window handle in focus
+    HWND m_hwndLastFocus = nullptr;
+
+    // Stores the handle of the parent native window
+    HWND parentWindow = nullptr;
+
+    // Stores the GUID of the last focus request
+    winrt::guid lastFocusRequestId;
+
+    // Function to return the xaml island currently in focus
+    winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource GetFocusedIsland();
+
+    // Function to pre process the message on the xaml source object
+    bool FilterMessage(const MSG* msg);
+
+    // Event triggered when focus is requested
+    void OnTakeFocusRequested(winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource const& sender, winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSourceTakeFocusRequestedEventArgs const& args);
+
+    // Function to return the next xaml island in focus
+    winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource GetNextFocusedIsland(MSG* msg);
+
+    // Function to handle focus navigation
+    bool NavigateFocus(MSG* msg);
+
+    // Stores the focus event objects
+    std::vector<winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource::TakeFocusRequested_revoker> m_takeFocusEventRevokers;
+
+    // Stores the xaml source objects
+    std::vector<winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource> m_xamlSources;
+
+    // Function invoked when the window is destroyed
+    void OnDestroy(HWND);
+
+    // Function invoked when the window is activated
+    void OnActivate(HWND, UINT state, HWND hwndActDeact, BOOL fMinimized);
+
+    // Function invoked when the window is set to focus
+    void OnSetFocus(HWND, HWND hwndOldFocus);
+};