290 lines
9.3 KiB
C++
290 lines
9.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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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 : public ComBaseClassHelper<IDropSource>
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{
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JuceDropSource() {}
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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 : 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 == 0)
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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 != 0)
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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 += 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 != 0)
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{
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dest.ptd = (DVTARGETDEVICE*) CoTaskMemAlloc (sizeof (DVTARGETDEVICE));
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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 : public ComBaseClassHelper <IDataObject>
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{
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public:
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JuceDataObject (JuceDropSource* s, const FORMATETC* f, const STGMEDIUM* m)
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: dropSource (s), format (f), medium (m)
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{
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}
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~JuceDataObject()
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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)
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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 = 0;
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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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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)
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{
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if (f == 0)
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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)
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{
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pFormatEtcOut->ptd = 0;
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return E_NOTIMPL;
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}
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JUCE_COMRESULT EnumFormatEtc (DWORD direction, IEnumFORMATETC** result)
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{
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if (result == 0)
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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 = 0;
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return E_NOTIMPL;
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}
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JUCE_COMRESULT GetDataHere (FORMATETC*, STGMEDIUM*) { return DATA_E_FORMATETC; }
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JUCE_COMRESULT SetData (FORMATETC*, STGMEDIUM*, BOOL) { return E_NOTIMPL; }
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JUCE_COMRESULT DAdvise (FORMATETC*, DWORD, IAdviseSink*, DWORD*) { return OLE_E_ADVISENOTSUPPORTED; }
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JUCE_COMRESULT DUnadvise (DWORD) { return E_NOTIMPL; }
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JUCE_COMRESULT EnumDAdvise (IEnumSTATDATA**) { return OLE_E_ADVISENOTSUPPORTED; }
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private:
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JuceDropSource* const dropSource;
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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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HDROP createHDrop (const StringArray& fileNames)
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{
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int totalBytes = 0;
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for (int i = fileNames.size(); --i >= 0;)
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totalBytes += (int) CharPointer_UTF16::getBytesRequiredFor (fileNames[i].getCharPointer()) + sizeof (WCHAR);
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HDROP hDrop = (HDROP) GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, sizeof (DROPFILES) + totalBytes + 4);
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if (hDrop != 0)
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{
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auto pDropFiles = (LPDROPFILES) GlobalLock (hDrop);
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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);
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}
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return hDrop;
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}
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bool performDragDrop (FORMATETC* const format, STGMEDIUM* const medium, const DWORD whatToDo)
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{
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auto source = new JuceDropSource();
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auto data = new JuceDataObject (source, format, medium);
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DWORD effect;
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auto res = DoDragDrop (data, source, whatToDo, &effect);
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data->Release();
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source->Release();
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return res == DRAGDROP_S_DROP;
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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, Component*)
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{
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FORMATETC format = { CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM medium = { TYMED_HGLOBAL, { 0 }, 0 };
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medium.hGlobal = DragAndDropHelpers::createHDrop (files);
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return DragAndDropHelpers::performDragDrop (&format, &medium, canMove ? (DWORD) (DROPEFFECT_COPY | DROPEFFECT_MOVE)
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: (DWORD) DROPEFFECT_COPY);
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}
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bool DragAndDropContainer::performExternalDragDropOfText (const String& text, Component*)
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{
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FORMATETC format = { CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM medium = { TYMED_HGLOBAL, { 0 }, 0 };
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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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WCHAR* const data = static_cast<WCHAR*> (GlobalLock (medium.hGlobal));
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text.copyToUTF16 (data, numBytes);
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format.cfFormat = CF_UNICODETEXT;
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GlobalUnlock (medium.hGlobal);
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return DragAndDropHelpers::performDragDrop (&format, &medium, DROPEFFECT_COPY | DROPEFFECT_MOVE);
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}
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} // namespace juce
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