Double and Triple Click Selection (microsoft#1197)

src/cascadia/TerminalControl/TermControl.h

@@ -104,6 +104,15 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
         //      viewport via touch input.
         std::optional<winrt::Windows::Foundation::Point> _touchAnchor;
 
+        using Timestamp = uint64_t;
+
+        // imported from WinUser
+        // Used for PointerPoint.Timestamp Property (https://docs.microsoft.com/en-us/uwp/api/windows.ui.input.pointerpoint.timestamp#Windows_UI_Input_PointerPoint_Timestamp)
+        Timestamp _multiClickTimer;
+        Timestamp _lastMouseClick;
+        unsigned int _multiClickCounter;
+        std::optional<winrt::Windows::Foundation::Point> _lastMouseClickPos;
+
         // Event revokers -- we need to deregister ourselves before we die,
         // lest we get callbacks afterwards.
         winrt::Windows::UI::Xaml::Controls::Control::SizeChanged_revoker _sizeChangedRevoker;
@@ -155,6 +164,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
         DWORD _GetPressedModifierKeys() const;
 
         const COORD _GetTerminalPosition(winrt::Windows::Foundation::Point cursorPosition);
+        const unsigned int _NumberOfClicks(winrt::Windows::Foundation::Point clickPos, Timestamp clickTime);
 
         double _GetAutoScrollSpeed(double cursorDistanceFromBorder) const;
     };

src/cascadia/TerminalCore/Terminal.cpp

@@ -133,6 +133,8 @@ void Terminal::UpdateSettings(winrt::Microsoft::Terminal::Settings::ICoreSetting
 
     _snapOnInput = settings.SnapOnInput();
 
+    _wordDelimiters = settings.WordDelimiters();
+
     // TODO:MSFT:21327402 - if HistorySize has changed, resize the buffer so we
     // have a smaller scrollback. We should do this carefully - if the new buffer
     // size is smaller than where the mutable viewport currently is, we'll want

src/cascadia/TerminalCore/Terminal.hpp

@@ -117,6 +117,8 @@ class Microsoft::Terminal::Core::Terminal final :
 #pragma region TextSelection
     // These methods are defined in TerminalSelection.cpp
     const bool IsSelectionActive() const noexcept;
+    void DoubleClickSelection(const COORD position);
+    void TripleClickSelection(const COORD position);
     void SetSelectionAnchor(const COORD position);
     void SetEndSelectionPosition(const COORD position);
     void SetBoxSelection(const bool isEnabled) noexcept;
@@ -149,6 +151,7 @@ class Microsoft::Terminal::Core::Terminal final :
     bool _selectionActive;
     SHORT _selectionAnchor_YOffset;
     SHORT _endSelectionPosition_YOffset;
+    std::wstring _wordDelimiters;
 
     std::shared_mutex _readWriteLock;
 
@@ -191,5 +194,9 @@ class Microsoft::Terminal::Core::Terminal final :
     std::vector<SMALL_RECT> _GetSelectionRects() const;
     const SHORT _ExpandWideGlyphSelectionLeft(const SHORT xPos, const SHORT yPos) const;
     const SHORT _ExpandWideGlyphSelectionRight(const SHORT xPos, const SHORT yPos) const;
+    void _ExpandDoubleClickSelectionLeft(const COORD position);
+    void _ExpandDoubleClickSelectionRight(const COORD position);
+    const bool _isWordDelimiter(std::wstring_view cellChar) const;
+    const COORD _ConvertToBufferCell(const COORD viewportPos) const;
 #pragma endregion
 };