100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
// This file is part of VSTGUI. It is subject to the license terms
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// in the LICENSE file found in the top-level directory of this
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// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE
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#pragma once
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#include "vstguibase.h"
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namespace VSTGUI {
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//-----------------------------------------------------------------------------
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/// @brief interface for drag&drop and clipboard data
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//-----------------------------------------------------------------------------
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class IDataPackage : public AtomicReferenceCounted
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{
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public:
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enum Type {
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/** File type (UTF-8 C-String) */
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kFilePath = 0,
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/** Text type (UTF-8 C-String) */
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kText,
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/** Binary type */
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kBinary,
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kError = -1
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};
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virtual uint32_t getCount () const = 0;
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virtual uint32_t getDataSize (uint32_t index) const = 0;
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virtual Type getDataType (uint32_t index) const = 0;
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virtual uint32_t getData (uint32_t index, const void*& buffer, Type& type) const = 0;
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protected:
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IDataPackage () {}
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};
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//-----------------------------------------------------------------------------
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/** IDataPackage iterator
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*
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* @ingroup new_in_4_12
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*/
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struct DataPackageIterator
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{
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struct Item
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{
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IDataPackage::Type type {IDataPackage::Type::kError};
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uint32_t dataSize {0};
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const void* data {nullptr};
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};
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DataPackageIterator (IDataPackage* pkg, uint32_t index = 0u) : pkg (pkg), index (index) {}
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DataPackageIterator& operator++ ()
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{
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item = {};
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index++;
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return *this;
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}
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const Item& operator->() const
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{
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gatherItem ();
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return item;
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}
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const Item& operator* () const
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{
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gatherItem ();
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return item;
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}
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bool operator!= (const DataPackageIterator& other) const
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{
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return other.pkg != pkg || other.index != index;
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}
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uint32_t getIndex () const { return index; }
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private:
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void gatherItem () const
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{
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if (item.data == nullptr && pkg && index < pkg->getCount ())
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item.dataSize = pkg->getData (index, item.data, item.type);
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}
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IDataPackage* pkg {nullptr};
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uint32_t index {0u};
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mutable Item item;
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};
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//-----------------------------------------------------------------------------
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inline DataPackageIterator begin (IDataPackage* pkg) { return DataPackageIterator (pkg); }
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//-----------------------------------------------------------------------------
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inline DataPackageIterator end (IDataPackage* pkg)
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{
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return DataPackageIterator (pkg, pkg->getCount ());
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}
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} // VSTGUI
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