Add system clipboard support to Windows

Aerofoil/GpSystemServices_Win32.cpp

@@ -1,14 +1,117 @@
 #include "GpSystemServices_Win32.h"
 #include "GpMutex_Win32.h"
 #include "GpThreadEvent_Win32.h"
+#include "GpWindows.h"
+
+#include "IGpClipboardContents.h"
+
+#include "UTF16.h"
+#include "UTF8.h"
 
 #include <assert.h>
+#include <vector>
 
 #pragma push_macro("CreateMutex")
 #ifdef CreateMutex
 #undef CreateMutex
 #endif
 
+extern GpWindowsGlobals g_gpWindowsGlobals;
+
+namespace GpSystemServices_Win32_Private
+{
+	class RefCountedClipboard
+	{
+	public:
+		RefCountedClipboard();
+
+	protected:
+		virtual ~RefCountedClipboard();
+
+		void AddRef();
+		void DecRef();
+
+		unsigned int m_refCount;
+	};
+
+	class TextClipboard : public RefCountedClipboard, public IGpClipboardContentsText
+	{
+	public:
+		TextClipboard(const uint8_t *utf8Text, size_t utf8Size);
+		~TextClipboard() override;
+
+		GpClipboardContentsType_t GetContentsType() const override;
+		void Destroy() override;
+		IGpClipboardContents *Clone() const override;
+		const uint8_t *GetBytes() const override;
+		size_t GetSize() const override;
+
+	private:
+		std::vector<uint8_t> m_utf8Text;
+	};
+
+
+	RefCountedClipboard::RefCountedClipboard()
+		: m_refCount(1)
+	{
+	}
+
+	RefCountedClipboard::~RefCountedClipboard()
+	{
+	}
+
+	void RefCountedClipboard::AddRef()
+	{
+		m_refCount++;
+	}
+
+	void RefCountedClipboard::DecRef()
+	{
+		unsigned int rc = --m_refCount;
+		if (rc == 0)
+			delete this;
+	}
+
+	TextClipboard::TextClipboard(const uint8_t *utf8Text, size_t utf8Size)
+	{
+		m_utf8Text.resize(utf8Size);
+		if (utf8Size > 0)
+			memcpy(&m_utf8Text[0], utf8Text, utf8Size);
+	}
+
+	TextClipboard::~TextClipboard()
+	{
+	}
+
+	GpClipboardContentsType_t TextClipboard::GetContentsType() const
+	{
+		return GpClipboardContentsTypes::kText;
+	}
+
+	void TextClipboard::Destroy()
+	{
+		this->DecRef();
+	}
+
+	IGpClipboardContents *TextClipboard::Clone() const
+	{
+		const_cast<TextClipboard*>(this)->AddRef();
+		return const_cast<TextClipboard*>(this);
+	}
+
+	const uint8_t *TextClipboard::GetBytes() const
+	{
+		if (m_utf8Text.size() == 0)
+			return nullptr;
+		return &m_utf8Text[0];
+	}
+
+	size_t TextClipboard::GetSize() const
+	{
+		return m_utf8Text.size();
+	}
+}
+
 struct GpSystemServices_Win32_ThreadStartParams
 {
 	GpSystemServices_Win32::ThreadFunc_t m_threadFunc;
@@ -34,6 +137,10 @@ GpSystemServices_Win32::GpSystemServices_Win32()
 {
 }
 
+GpSystemServices_Win32::~GpSystemServices_Win32()
+{
+}
+
 int64_t GpSystemServices_Win32::GetTime() const
 {
 	SYSTEMTIME epochStart;
@@ -171,6 +278,89 @@ bool GpSystemServices_Win32::AreFontResourcesSeekable() const
 	return true;
 }
 
+IGpClipboardContents *GpSystemServices_Win32::GetClipboardContents() const
+{
+	IGpClipboardContents *cbObject = nullptr;
+
+	if (IsClipboardFormatAvailable(CF_UNICODETEXT))
+	{
+		if (OpenClipboard(g_gpWindowsGlobals.m_hwnd))
+		{
+			HGLOBAL textHandle = GetClipboardData(CF_UNICODETEXT);
+			if (textHandle)
+			{
+				const wchar_t *str = static_cast<const wchar_t*>(GlobalLock(textHandle));
+				if (str)
+				{
+					if (str[0] == 0)
+						cbObject = new GpSystemServices_Win32_Private::TextClipboard(nullptr, 0);
+					else
+					{
+						int bytesRequired = WideCharToMultiByte(CP_UTF8, 0, str, -1, nullptr, 0, nullptr, nullptr);
+
+						if (bytesRequired > 0)
+						{
+							std::vector<char> decodedText;
+							decodedText.resize(bytesRequired);
+							WideCharToMultiByte(CP_UTF8, 0, str, -1, &decodedText[0], bytesRequired, nullptr, nullptr);
+
+							cbObject = new GpSystemServices_Win32_Private::TextClipboard(reinterpret_cast<const uint8_t*>(&decodedText[0]), decodedText.size() - 1);
+						}
+					}
+
+					GlobalUnlock(textHandle);
+				}
+			}
+			CloseClipboard();
+		}
+	}
+
+	return cbObject;
+}
+
+void GpSystemServices_Win32::SetClipboardContents(IGpClipboardContents *contents)
+{
+	if (!contents)
+		return;
+
+	if (contents->GetContentsType() == GpClipboardContentsTypes::kText)
+	{
+		IGpClipboardContentsText *textContents = static_cast<IGpClipboardContentsText*>(contents);
+
+		if (OpenClipboard(g_gpWindowsGlobals.m_hwnd))
+		{
+			if (EmptyClipboard())
+			{
+				int wcharsRequired = MultiByteToWideChar(CP_UTF8, 0, reinterpret_cast<const char*>(textContents->GetBytes()), textContents->GetSize(), nullptr, 0);
+
+				std::vector<wchar_t> wideChars;
+
+				if (wcharsRequired)
+				{
+					wideChars.resize(wcharsRequired + 1);
+					MultiByteToWideChar(CP_UTF8, 0, reinterpret_cast<const char*>(textContents->GetBytes()), textContents->GetSize(), &wideChars[0], wcharsRequired);
+				}
+				else
+					wideChars.resize(1);
+
+				wideChars[wideChars.size() - 1] = static_cast<wchar_t>(0);
+
+				HGLOBAL textObject = GlobalAlloc(GMEM_MOVEABLE, wideChars.size() * sizeof(wchar_t));
+				if (textObject)
+				{
+					wchar_t *buffer = static_cast<wchar_t*>(GlobalLock(textObject));
+					memcpy(buffer, &wideChars[0], wideChars.size() * sizeof(wchar_t));
+					GlobalUnlock(textObject);
+
+					SetClipboardData(CF_UNICODETEXT, textObject);
+				}
+			}
+
+			CloseClipboard();
+		}
+	}
+}
+
 
 void GpSystemServices_Win32::SetTouchscreenSimulation(bool isTouchscreenSimulation)
 {

Aerofoil/GpSystemServices_Win32.h

@@ -19,6 +19,7 @@ class GpSystemServices_Win32 final : public IGpSystemServices
 {
 public:
 	GpSystemServices_Win32();
+	~GpSystemServices_Win32();
 
 	int64_t GetTime() const override;
 	void GetLocalDateTime(unsigned int &year, unsigned int &month, unsigned int &day, unsigned int &hour, unsigned int &minute, unsigned int &second) const override;
@@ -36,6 +37,8 @@ public:
 	void SetTextInputEnabled(bool isEnabled) override;
 	bool IsTextInputEnabled() const override;
 	bool AreFontResourcesSeekable() const override;
+	IGpClipboardContents *GetClipboardContents() const override;
+	void SetClipboardContents(IGpClipboardContents *contents) override;
 
 	void SetTouchscreenSimulation(bool isTouchscreenSimulation);