Accessibility: Set-up UIA Tree

src/cascadia/TerminalCore/Terminal.hpp

@@ -101,6 +101,23 @@ class Microsoft::Terminal::Core::Terminal final :
     const std::vector<Microsoft::Console::Render::RenderOverlay> GetOverlays() const noexcept override;
     const bool IsGridLineDrawingAllowed() noexcept override;
     std::vector<Microsoft::Console::Types::Viewport> GetSelectionRects() noexcept override;
+    bool IsAreaSelected() const override;
+    void ClearSelection() override;
+    void SelectNewRegion(const COORD coordStart, const COORD coordEnd) override;
+
+    // TODO GitHub #605: Search functionality
+    // For now, just adding it here to make UiaTextRange easier to create (Accessibility)
+    // We should actually abstract this out better once Windows Terminal has Search
+    HRESULT SearchForText(_In_ BSTR text,
+                          _In_ BOOL searchBackward,
+                          _In_ BOOL ignoreCase,
+                          _Outptr_result_maybenull_ ITextRangeProvider** ppRetVal,
+                          unsigned int _start,
+                          unsigned int _end,
+                          std::function<unsigned int(IRenderData*, const COORD)> _coordToEndpoint,
+                          std::function<COORD(IRenderData*, const unsigned int)> _endpointToCoord,
+                          std::function<IFACEMETHODIMP(ITextRangeProvider**)> Clone) override;
+
     const std::wstring GetConsoleTitle() const noexcept override;
     void LockConsole() noexcept override;
     void UnlockConsole() noexcept override;
@@ -122,7 +139,6 @@ class Microsoft::Terminal::Core::Terminal final :
     void SetSelectionAnchor(const COORD position);
     void SetEndSelectionPosition(const COORD position);
     void SetBoxSelection(const bool isEnabled) noexcept;
-    void ClearSelection() noexcept;
 
     const std::wstring RetrieveSelectedTextFromBuffer(bool trimTrailingWhitespace) const;
 #pragma endregion

src/cascadia/TerminalCore/TerminalSelection.cpp

@@ -210,7 +210,7 @@ void Terminal::SetBoxSelection(const bool isEnabled) noexcept
 
 // Method Description:
 // - clear selection data and disable rendering it
-void Terminal::ClearSelection() noexcept
+void Terminal::ClearSelection()
 {
     _selectionActive = false;
     _selectionAnchor = { 0, 0 };

src/cascadia/TerminalCore/terminalrenderdata.cpp

@@ -117,6 +117,33 @@ std::vector<Microsoft::Console::Types::Viewport> Terminal::GetSelectionRects() n
     return result;
 }
 
+bool Terminal::IsAreaSelected() const
+{
+    return _selectionActive;
+}
+
+void Terminal::SelectNewRegion(const COORD coordStart, const COORD coordEnd)
+{
+    SetSelectionAnchor(coordStart);
+    SetEndSelectionPosition(coordEnd);
+}
+
+// TODO GitHub #605: Search functionality
+// For now, just adding it here to make UiaTextRange easier to create (Accessibility)
+// We should actually abstract this out better once Windows Terminal has Search
+HRESULT Terminal::SearchForText(_In_ BSTR /*text*/,
+                                _In_ BOOL /*searchBackward*/,
+                                _In_ BOOL /*ignoreCase*/,
+                                _Outptr_result_maybenull_ ITextRangeProvider** /*ppRetVal*/,
+                                unsigned int /*_start*/,
+                                unsigned int /*_end*/,
+                                std::function<unsigned int(IRenderData*, const COORD)> /*_coordToEndpoint*/,
+                                std::function<COORD(IRenderData*, const unsigned int)> /*_endpointToCoord*/,
+                                std::function<IFACEMETHODIMP(ITextRangeProvider**)> /*Clone*/)
+{
+    return E_NOTIMPL;
+}
+
 const std::wstring Terminal::GetConsoleTitle() const noexcept
 {
     return _title;

src/cascadia/WindowsTerminal/BaseWindow.h

@@ -3,11 +3,16 @@
 
 #pragma once
 
+#include "..\types\IConsoleWindow.hpp"
+#include "..\types\WindowUiaProviderBase.hpp"
+
 // Custom window messages
 #define CM_UPDATE_TITLE (WM_USER)
 
 #include <wil/resource.h>
 
+using namespace Microsoft::Console::Types;
+
 template<typename T>
 class BaseWindow
 {
@@ -51,6 +56,11 @@ class BaseWindow
             return HandleDpiChange(_window.get(), wparam, lparam);
         }
 
+        case WM_GETOBJECT:
+        {
+            return HandleGetObject(_window.get(), wparam, lparam);
+        }
+
         case WM_DESTROY:
         {
             PostQuitMessage(0);
@@ -121,6 +131,22 @@ class BaseWindow
         return 0;
     }
 
+    [[nodiscard]] LRESULT HandleGetObject(const HWND hWnd, const WPARAM wParam, const LPARAM lParam)
+    {
+        LRESULT retVal = 0;
+
+        // If we are receiving a request from Microsoft UI Automation framework, then return the basic UIA COM interface.
+        if (static_cast<long>(lParam) == static_cast<long>(UiaRootObjectId))
+        {
+            retVal = UiaReturnRawElementProvider(hWnd, wParam, lParam, _GetUiaProvider());
+        }
+        // Otherwise, return 0. We don't implement MS Active Accessibility (the other framework that calls WM_GETOBJECT).
+
+        return retVal;
+    }
+
+    virtual IRawElementProviderSimple* _GetUiaProvider() = 0;
+
     virtual void OnResize(const UINT width, const UINT height) = 0;
     virtual void OnMinimize() = 0;
     virtual void OnRestore() = 0;
@@ -135,7 +161,7 @@ class BaseWindow
     HWND GetHandle() const noexcept
     {
         return _window.get();
-    };
+    }
 
     float GetCurrentDpiScale() const noexcept
     {
@@ -187,7 +213,7 @@ class BaseWindow
     {
         _title = newTitle;
         PostMessageW(_window.get(), CM_UPDATE_TITLE, 0, reinterpret_cast<LPARAM>(nullptr));
-    };
+    }
 
 protected:
     using base_type = BaseWindow<T>;

src/cascadia/WindowsTerminal/IslandWindow.cpp

@@ -179,6 +179,30 @@ void IslandWindow::OnSize(const UINT width, const UINT height)
     return base_type::MessageHandler(message, wparam, lparam);
 }
 
+// Routine Description:
+// - Creates/retrieves a handle to the UI Automation provider COM interfaces
+// Arguments:
+// - <none>
+// Return Value:
+// - Pointer to UI Automation provider class/interfaces.
+IRawElementProviderSimple* IslandWindow::_GetUiaProvider()
+{
+    if (nullptr == _pUiaProvider)
+    {
+        try
+        {
+            _pUiaProvider = WindowUiaProvider::Create(this);
+        }
+        catch (...)
+        {
+            LOG_HR(wil::ResultFromCaughtException());
+            _pUiaProvider = nullptr;
+        }
+    }
+
+    return _pUiaProvider;
+}
+
 // Method Description:
 // - Called when the window has been resized (or maximized)
 // Arguments:

src/cascadia/WindowsTerminal/IslandWindow.h

@@ -3,10 +3,14 @@
 
 #include "pch.h"
 #include "BaseWindow.h"
+#include "../types/IUiaWindow.h"
+#include "WindowUiaProvider.hpp"
 #include <winrt/Microsoft.Terminal.TerminalControl.h>
 #include <winrt/TerminalApp.h>
 
-class IslandWindow : public BaseWindow<IslandWindow>
+class IslandWindow :
+    public BaseWindow<IslandWindow>,
+    public IUiaWindow
 {
 public:
     IslandWindow() noexcept;
@@ -17,6 +21,7 @@ class IslandWindow : public BaseWindow<IslandWindow>
     virtual void OnSize(const UINT width, const UINT height);
 
     [[nodiscard]] virtual LRESULT MessageHandler(UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept override;
+    IRawElementProviderSimple* _GetUiaProvider();
     void OnResize(const UINT width, const UINT height) override;
     void OnMinimize() override;
     void OnRestore() override;
@@ -29,6 +34,38 @@ class IslandWindow : public BaseWindow<IslandWindow>
 
     void UpdateTheme(const winrt::Windows::UI::Xaml::ElementTheme& requestedTheme);
 
+#pragma region IUiaWindow
+    void ChangeViewport(const SMALL_RECT NewWindow)
+    {
+        // TODO GitHub #1352: Hook up ScreenInfoUiaProvider to WindowUiaProvider
+        // Relevant comment from zadjii-msft:
+        /*
+        In my head for designing this, I'd then have IslandWindow::ChangeViewport
+        call a callback that AppHost sets, where AppHost will then call into the
+        TerminalApp to have TerminalApp handle the ChangeViewport call.
+        (See IslandWindow::SetCreateCallback as an example of a similar
+        pattern we're using today.) That way, if someone else were trying
+        to resuse this, they could have their own AppHost (or TerminalApp
+        equivalent) handle the ChangeViewport call their own way.
+        */
+        return;
+    };
+
+    HWND GetWindowHandle() const noexcept override
+    {
+        return BaseWindow::GetHandle();
+    };
+
+    [[nodiscard]] HRESULT SignalUia(_In_ EVENTID id) override { return E_NOTIMPL; };
+    [[nodiscard]] HRESULT UiaSetTextAreaFocus() override { return E_NOTIMPL; };
+
+    RECT GetWindowRect() const noexcept override
+    {
+        return BaseWindow::GetWindowRect();
+    };
+
+#pragma endregion
+
 protected:
     void ForceResize()
     {
@@ -38,6 +75,7 @@ class IslandWindow : public BaseWindow<IslandWindow>
     }
 
     HWND _interopWindowHandle;
+    WindowUiaProvider* _pUiaProvider;
 
     winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource _source;