Initial community commit

Src/external_dependencies/openmpt-trunk/mptrack/Clipboard.h

@@ -0,0 +1,105 @@
+/*
+* Clipboard.h
+* -----------
+* Purpose: RAII wrapper around operating system clipboard
+* Notes  : (currently none)
+* Authors: OpenMPT Devs
+* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+*/
+
+#pragma once
+
+#include "openmpt/all/BuildSettings.hpp"
+
+class Clipboard
+{
+public:
+	// Open clipboard for writing (size > 0) or reading (size == 0).
+	Clipboard(UINT clipFormat, size_t size = 0)
+		: m_clipFormat(clipFormat)
+	{
+		m_opened = theApp.GetMainWnd()->OpenClipboard() != FALSE;
+		if(size > 0)
+		{
+			if(m_opened && (m_hCpy = ::GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, size)) != nullptr)
+			{
+				::EmptyClipboard();
+				m_data = mpt::as_span(static_cast<std::byte *>(::GlobalLock(m_hCpy)), size);
+			}
+		} else
+		{
+			HGLOBAL hCpy = ::GetClipboardData(m_clipFormat);
+			void *p = nullptr;
+			if(hCpy != nullptr && (p = ::GlobalLock(hCpy)) != nullptr)
+			{
+				m_data = mpt::as_span(mpt::void_cast<std::byte *>(p), ::GlobalSize(hCpy));
+			}
+		}
+	}
+
+	bool IsValid() const
+	{
+		return m_opened && m_hCpy && m_data.data();
+	}
+
+	template<typename T>
+	T *As()
+	{
+		return mpt::byte_cast<T*>(m_data.data());
+	}
+
+	mpt::byte_span Get()
+	{
+		return m_data;
+	}
+
+	std::string_view GetString() const
+	{
+		if(m_data.data())
+			return { mpt::byte_cast<const char *>(m_data.data()), m_data.size() };
+		else
+			return {};
+	}
+
+	Clipboard operator =(mpt::const_byte_span data)
+	{
+		MPT_ASSERT(m_data.size() >= data.size());
+		std::copy(data.begin(), data.end(), m_data.begin());
+		return *this;
+	}
+
+	template <typename T>
+	Clipboard operator =(const T &v)
+	{
+		mpt::const_byte_span data = mpt::as_raw_memory(v);
+		MPT_ASSERT(m_data.size() >= data.size());
+		std::copy(data.begin(), data.end(), m_data.begin());
+		return *this;
+	}
+
+	void Close()
+	{
+		if(m_hCpy)
+		{
+			::GlobalUnlock(m_hCpy);
+			::SetClipboardData(m_clipFormat, static_cast<HANDLE>(m_hCpy));
+			m_hCpy = nullptr;
+		}
+		if(m_opened)
+		{
+			::CloseClipboard();
+			m_opened = false;
+		}
+	}
+
+	~Clipboard()
+	{
+		Close();
+	}
+
+protected:
+	HGLOBAL m_hCpy = nullptr;
+	mpt::byte_span m_data;
+	UINT m_clipFormat;
+	bool m_opened = false;
+};