[FancyZones] Improve code quality (part 3: window dragging) (#23040)

src/modules/fancyzones/FancyZonesLib/DraggingState.cpp

@@ -0,0 +1,83 @@
+#include "pch.h"
+#include "DraggingState.h"
+
+#include <FancyZonesLib/Settings.h>
+#include <FancyZonesLib/util.h>
+
+DraggingState::DraggingState(const std::function<void()>& keyUpdateCallback) :
+    m_mouseState(false),
+    m_mouseHook(std::bind(&DraggingState::OnMouseDown, this)),
+    m_leftShiftKeyState(keyUpdateCallback),
+    m_rightShiftKeyState(keyUpdateCallback),
+    m_ctrlKeyState(keyUpdateCallback),
+    m_keyUpdateCallback(keyUpdateCallback)
+{
+}
+
+void DraggingState::Enable()
+{
+    if (FancyZonesSettings::settings().mouseSwitch)
+    {
+        m_mouseHook.enable();
+    }
+
+    m_leftShiftKeyState.enable();
+    m_rightShiftKeyState.enable();
+    m_ctrlKeyState.enable();
+}
+
+void DraggingState::Disable()
+{
+    bool leftShiftPressed = m_leftShiftKeyState.state();
+    bool rightShiftPressed = m_rightShiftKeyState.state();
+
+    if (FancyZonesSettings::settings().shiftDrag)
+    {
+        if (leftShiftPressed)
+        {
+            FancyZonesUtils::SwallowKey(VK_LSHIFT);
+        }
+
+        if (rightShiftPressed)
+        {
+            FancyZonesUtils::SwallowKey(VK_RSHIFT);
+        }
+    }
+
+    m_dragging = false;
+    m_mouseState = false;
+
+    m_mouseHook.disable();
+    m_leftShiftKeyState.disable();
+    m_rightShiftKeyState.disable();
+    m_ctrlKeyState.disable();
+}
+
+void DraggingState::UpdateDraggingState() noexcept
+{
+    // This updates m_dragEnabled depending on if the shift key is being held down
+    if (FancyZonesSettings::settings().shiftDrag)
+    {
+        m_dragging = ((m_leftShiftKeyState.state() || m_rightShiftKeyState.state()) ^ m_mouseState);
+    }
+    else
+    {
+        m_dragging = !((m_leftShiftKeyState.state() || m_rightShiftKeyState.state()) ^ m_mouseState);
+    }
+}
+
+void DraggingState::OnMouseDown()
+{
+    m_mouseState = !m_mouseState;
+    m_keyUpdateCallback();
+}
+
+bool DraggingState::IsDragging() const noexcept
+{
+    return m_dragging;
+}
+
+bool DraggingState::IsSelectManyZonesState() const noexcept
+{
+    return m_ctrlKeyState.state();
+}