mirror of
https://github.com/juce-framework/JUCE.git
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80ac9a78a0
The INLINE macros allow singletons to be declared and defined in one line, without requiring a separate JUCE_IMPLEMENT_SINGLETON statement.
375 lines
12 KiB
C++
375 lines
12 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace DragAndDropHelpers
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{
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//==============================================================================
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struct JuceDropSource final : public ComBaseClassHelper<IDropSource>
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{
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JuceDropSource() = default;
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JUCE_COMRESULT QueryContinueDrag (BOOL escapePressed, DWORD keys) override
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{
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if (escapePressed)
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return DRAGDROP_S_CANCEL;
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if ((keys & (MK_LBUTTON | MK_RBUTTON)) == 0)
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return DRAGDROP_S_DROP;
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return S_OK;
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}
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JUCE_COMRESULT GiveFeedback (DWORD) override
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{
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return DRAGDROP_S_USEDEFAULTCURSORS;
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}
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};
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//==============================================================================
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struct JuceEnumFormatEtc final : public ComBaseClassHelper<IEnumFORMATETC>
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{
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JuceEnumFormatEtc (const FORMATETC* f) : format (f) {}
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JUCE_COMRESULT Clone (IEnumFORMATETC** result) override
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{
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if (result == nullptr)
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return E_POINTER;
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auto newOne = new JuceEnumFormatEtc (format);
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newOne->index = index;
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*result = newOne;
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return S_OK;
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}
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JUCE_COMRESULT Next (ULONG celt, LPFORMATETC lpFormatEtc, ULONG* pceltFetched) override
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{
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if (pceltFetched != nullptr)
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*pceltFetched = 0;
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else if (celt != 1)
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return S_FALSE;
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if (index == 0 && celt > 0 && lpFormatEtc != nullptr)
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{
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copyFormatEtc (lpFormatEtc [0], *format);
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++index;
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if (pceltFetched != nullptr)
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*pceltFetched = 1;
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return S_OK;
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}
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return S_FALSE;
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}
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JUCE_COMRESULT Skip (ULONG celt) override
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{
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if (index + (int) celt >= 1)
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return S_FALSE;
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index += (int) celt;
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return S_OK;
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}
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JUCE_COMRESULT Reset() override
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{
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index = 0;
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return S_OK;
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}
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private:
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const FORMATETC* const format;
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int index = 0;
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static void copyFormatEtc (FORMATETC& dest, const FORMATETC& source)
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{
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dest = source;
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if (source.ptd != nullptr)
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{
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dest.ptd = (DVTARGETDEVICE*) CoTaskMemAlloc (sizeof (DVTARGETDEVICE));
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if (dest.ptd != nullptr)
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*(dest.ptd) = *(source.ptd);
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}
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}
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JUCE_DECLARE_NON_COPYABLE (JuceEnumFormatEtc)
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};
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//==============================================================================
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class JuceDataObject final : public ComBaseClassHelper<IDataObject>
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{
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public:
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JuceDataObject (const FORMATETC* f, const STGMEDIUM* m)
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: format (f), medium (m)
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{
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}
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~JuceDataObject() override
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{
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jassert (refCount == 0);
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}
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JUCE_COMRESULT GetData (FORMATETC* pFormatEtc, STGMEDIUM* pMedium) override
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{
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if ((pFormatEtc->tymed & format->tymed) != 0
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&& pFormatEtc->cfFormat == format->cfFormat
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&& pFormatEtc->dwAspect == format->dwAspect)
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{
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pMedium->tymed = format->tymed;
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pMedium->pUnkForRelease = nullptr;
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if (format->tymed == TYMED_HGLOBAL)
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{
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auto len = GlobalSize (medium->hGlobal);
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void* const src = GlobalLock (medium->hGlobal);
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void* const dst = GlobalAlloc (GMEM_FIXED, len);
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if (src != nullptr && dst != nullptr)
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memcpy (dst, src, len);
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GlobalUnlock (medium->hGlobal);
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pMedium->hGlobal = dst;
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return S_OK;
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}
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}
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return DV_E_FORMATETC;
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}
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JUCE_COMRESULT QueryGetData (FORMATETC* f) override
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{
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if (f == nullptr)
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return E_INVALIDARG;
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if (f->tymed == format->tymed
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&& f->cfFormat == format->cfFormat
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&& f->dwAspect == format->dwAspect)
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return S_OK;
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return DV_E_FORMATETC;
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}
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JUCE_COMRESULT GetCanonicalFormatEtc (FORMATETC*, FORMATETC* pFormatEtcOut) override
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{
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pFormatEtcOut->ptd = nullptr;
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return E_NOTIMPL;
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}
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JUCE_COMRESULT EnumFormatEtc (DWORD direction, IEnumFORMATETC** result) override
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{
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if (result == nullptr)
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return E_POINTER;
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if (direction == DATADIR_GET)
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{
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*result = new JuceEnumFormatEtc (format);
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return S_OK;
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}
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*result = nullptr;
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return E_NOTIMPL;
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}
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JUCE_COMRESULT GetDataHere (FORMATETC*, STGMEDIUM*) override { return DATA_E_FORMATETC; }
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JUCE_COMRESULT SetData (FORMATETC*, STGMEDIUM*, BOOL) override { return E_NOTIMPL; }
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JUCE_COMRESULT DAdvise (FORMATETC*, DWORD, IAdviseSink*, DWORD*) override { return OLE_E_ADVISENOTSUPPORTED; }
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JUCE_COMRESULT DUnadvise (DWORD) override { return E_NOTIMPL; }
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JUCE_COMRESULT EnumDAdvise (IEnumSTATDATA**) override { return OLE_E_ADVISENOTSUPPORTED; }
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private:
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const FORMATETC* const format;
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const STGMEDIUM* const medium;
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JUCE_DECLARE_NON_COPYABLE (JuceDataObject)
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};
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//==============================================================================
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static HDROP createHDrop (const StringArray& fileNames)
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{
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size_t totalBytes = 0;
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for (int i = fileNames.size(); --i >= 0;)
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totalBytes += CharPointer_UTF16::getBytesRequiredFor (fileNames[i].getCharPointer()) + sizeof (WCHAR);
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struct Deleter
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{
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void operator() (void* ptr) const noexcept { GlobalFree (ptr); }
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};
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auto hDrop = std::unique_ptr<void, Deleter> ((HDROP) GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, sizeof (DROPFILES) + totalBytes + 4));
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if (hDrop != nullptr)
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{
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auto pDropFiles = (LPDROPFILES) GlobalLock (hDrop.get());
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if (pDropFiles == nullptr)
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return nullptr;
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pDropFiles->pFiles = sizeof (DROPFILES);
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pDropFiles->fWide = true;
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auto* fname = reinterpret_cast<WCHAR*> (addBytesToPointer (pDropFiles, sizeof (DROPFILES)));
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for (int i = 0; i < fileNames.size(); ++i)
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{
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auto bytesWritten = fileNames[i].copyToUTF16 (fname, 2048);
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fname = reinterpret_cast<WCHAR*> (addBytesToPointer (fname, bytesWritten));
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}
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*fname = 0;
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GlobalUnlock (hDrop.get());
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}
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return static_cast<HDROP> (hDrop.release());
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}
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struct DragAndDropJob final : public ThreadPoolJob
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{
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DragAndDropJob (FORMATETC f, STGMEDIUM m, DWORD d, std::function<void()>&& cb)
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: ThreadPoolJob ("DragAndDrop"),
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format (f), medium (m), whatToDo (d),
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completionCallback (std::move (cb))
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{
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}
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JobStatus runJob() override
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{
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[[maybe_unused]] const auto result = OleInitialize (nullptr);
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auto* source = new JuceDropSource();
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auto* data = new JuceDataObject (&format, &medium);
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DWORD effect;
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DoDragDrop (data, source, whatToDo, &effect);
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data->Release();
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source->Release();
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OleUninitialize();
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if (completionCallback != nullptr)
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MessageManager::callAsync (std::move (completionCallback));
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return jobHasFinished;
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}
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FORMATETC format;
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STGMEDIUM medium;
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DWORD whatToDo;
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std::function<void()> completionCallback;
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};
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class ThreadPoolHolder final : private DeletedAtShutdown
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{
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public:
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ThreadPoolHolder() = default;
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~ThreadPoolHolder()
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{
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// Wait forever if there's a job running. The user needs to cancel the transfer
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// in the GUI.
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pool.removeAllJobs (true, -1);
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clearSingletonInstance();
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}
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JUCE_DECLARE_SINGLETON_SINGLETHREADED_INLINE (ThreadPoolHolder, false)
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// We need to make sure we don't do simultaneous text and file drag and drops,
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// so use a pool that can only run a single job.
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ThreadPool pool { ThreadPoolOptions{}.withNumberOfThreads (1) };
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};
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}
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//==============================================================================
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bool DragAndDropContainer::performExternalDragDropOfFiles (const StringArray& files, const bool canMove,
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Component*, std::function<void()> callback)
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{
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if (files.isEmpty())
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return false;
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FORMATETC format = { CF_HDROP, nullptr, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM medium = { TYMED_HGLOBAL, { nullptr }, nullptr };
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medium.hGlobal = DragAndDropHelpers::createHDrop (files);
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auto& pool = DragAndDropHelpers::ThreadPoolHolder::getInstance()->pool;
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pool.addJob (new DragAndDropHelpers::DragAndDropJob (format, medium,
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canMove ? (DROPEFFECT_COPY | DROPEFFECT_MOVE) : DROPEFFECT_COPY,
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std::move (callback)),
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true);
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return true;
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}
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bool DragAndDropContainer::performExternalDragDropOfText (const String& text, Component*, std::function<void()> callback)
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{
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if (text.isEmpty())
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return false;
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FORMATETC format = { CF_TEXT, nullptr, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM medium = { TYMED_HGLOBAL, { nullptr }, nullptr };
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auto numBytes = CharPointer_UTF16::getBytesRequiredFor (text.getCharPointer());
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medium.hGlobal = GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, numBytes + 2);
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if (medium.hGlobal == nullptr)
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return false;
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auto* data = static_cast<WCHAR*> (GlobalLock (medium.hGlobal));
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text.copyToUTF16 (data, numBytes + 2);
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format.cfFormat = CF_UNICODETEXT;
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GlobalUnlock (medium.hGlobal);
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auto& pool = DragAndDropHelpers::ThreadPoolHolder::getInstance()->pool;
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pool.addJob (new DragAndDropHelpers::DragAndDropJob (format,
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medium,
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DROPEFFECT_COPY | DROPEFFECT_MOVE,
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std::move (callback)),
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true);
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return true;
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}
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} // namespace juce
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