qtbase/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp

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**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
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** $QT_END_LICENSE$
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****************************************************************************/

#include "qwindowsdialoghelpers.h"

#include "qwindowscontext.h"
#include "qwindowswindow.h"

#include <QtWidgets/QColorDialog>
#include <QtWidgets/QFontDialog>
#include <QtWidgets/QFileDialog>

#include <QtGui/QGuiApplication>
#include <QtGui/QColor>

#include <QtCore/QDebug>
#include <QtCore/QRegExp>
#include <QtCore/QTimer>
#include <QtCore/QDir>
#include <QtCore/QScopedArrayPointer>
#include <QtCore/QSharedPointer>
#include <QtCore/QObject>
#include <QtCore/QThread>
#include <QtCore/private/qsystemlibrary_p.h>

#include "qtwindows_additional.h"

#define STRICT_TYPED_ITEMIDS
#include <shlobj.h>
#include <shlwapi.h>

// #define USE_NATIVE_COLOR_DIALOG /* Testing purposes only */

#ifdef Q_CC_MINGW /* Add missing declarations for MinGW */

/* Constants obtained by running the below stream operator for
 * CLSID, IID on the constants in the Windows SDK libraries. */

static const IID   IID_IFileOpenDialog   = {0xd57c7288, 0xd4ad, 0x4768, {0xbe, 0x02, 0x9d, 0x96, 0x95, 0x32, 0xd9, 0x60}};
static const IID   IID_IFileSaveDialog   = {0x84bccd23, 0x5fde, 0x4cdb,{0xae, 0xa4, 0xaf, 0x64, 0xb8, 0x3d, 0x78, 0xab}};
static const IID   IID_IShellItem        = {0x43826d1e, 0xe718, 0x42ee, {0xbc, 0x55, 0xa1, 0xe2, 0x61, 0xc3, 0x7b, 0xfe}};
static const IID   IID_IFileDialogEvents = {0x973510db, 0x7d7f, 0x452b,{0x89, 0x75, 0x74, 0xa8, 0x58, 0x28, 0xd3, 0x54}};
static const CLSID CLSID_FileOpenDialog  = {0xdc1c5a9c, 0xe88a, 0x4dde, {0xa5, 0xa1, 0x60, 0xf8, 0x2a, 0x20, 0xae, 0xf7}};
static const CLSID CLSID_FileSaveDialog  = {0xc0b4e2f3, 0xba21, 0x4773,{0x8d, 0xba, 0x33, 0x5e, 0xc9, 0x46, 0xeb, 0x8b}};

typedef struct _COMDLG_FILTERSPEC
{
    LPCWSTR pszName;
    LPCWSTR pszSpec;
} COMDLG_FILTERSPEC;


#define FOS_OVERWRITEPROMPT        0x2
#define FOS_STRICTFILETYPES        0x4
#define FOS_NOCHANGEDIR        0x8
#define FOS_PICKFOLDERS        0x20
#define FOS_FORCEFILESYSTEM        0x40
#define FOS_ALLNONSTORAGEITEMS 0x80
#define FOS_NOVALIDATE         0x100
#define FOS_ALLOWMULTISELECT   0x200
#define FOS_PATHMUSTEXIST      0x800
#define FOS_FILEMUSTEXIST      0x1000
#define FOS_CREATEPROMPT       0x2000
#define FOS_SHAREAWARE         0x4000
#define FOS_NOREADONLYRETURN   0x8000
#define FOS_NOTESTFILECREATE   0x10000
#define FOS_HIDEMRUPLACES      0x20000
#define FOS_HIDEPINNEDPLACES   0x40000
#define FOS_NODEREFERENCELINKS 0x100000
#define FOS_DONTADDTORECENT    0x2000000
#define FOS_FORCESHOWHIDDEN    0x10000000
#define FOS_DEFAULTNOMINIMODE  0x20000000
#define FOS_FORCEPREVIEWPANEON 0x40000000

typedef int GETPROPERTYSTOREFLAGS;
#define GPS_DEFAULT               0x00000000
#define GPS_HANDLERPROPERTIESONLY 0x00000001
#define GPS_READWRITE             0x00000002
#define GPS_TEMPORARY             0x00000004
#define GPS_FASTPROPERTIESONLY    0x00000008
#define GPS_OPENSLOWITEM          0x00000010
#define GPS_DELAYCREATION         0x00000020
#define GPS_BESTEFFORT            0x00000040
#define GPS_MASK_VALID            0x0000007F

typedef int (QT_WIN_CALLBACK* BFFCALLBACK)(HWND hwnd, UINT uMsg, LPARAM lParam, LPARAM lpData);
// message from browser
#define BFFM_INITIALIZED        1
#define BFFM_SELCHANGED         2
#define BFFM_ENABLEOK           (WM_USER + 101)
// Browsing for directory.
#define BIF_NONEWFOLDERBUTTON  0x0200
#define BIF_NOTRANSLATETARGETS 0x0400
#define BIF_BROWSEFORCOMPUTER  0x1000
#define BIF_BROWSEFORPRINTER   0x2000
#define BIF_BROWSEINCLUDEFILES 0x4000
#define BIF_SHAREABLE          0x8000

//the enums
typedef enum {
    SIATTRIBFLAGS_AND   = 0x1,
    SIATTRIBFLAGS_OR    = 0x2,
    SIATTRIBFLAGS_APPCOMPAT     = 0x3,
    SIATTRIBFLAGS_MASK  = 0x3
}       SIATTRIBFLAGS;
typedef enum {
    SIGDN_NORMALDISPLAY = 0x00000000,
    SIGDN_PARENTRELATIVEPARSING = 0x80018001,
    SIGDN_PARENTRELATIVEFORADDRESSBAR = 0x8001c001,
    SIGDN_DESKTOPABSOLUTEPARSING = 0x80028000,
    SIGDN_PARENTRELATIVEEDITING = 0x80031001,
    SIGDN_DESKTOPABSOLUTEEDITING = 0x8004c000,
    SIGDN_FILESYSPATH = 0x80058000,
    SIGDN_URL = 0x80068000
} SIGDN;
typedef enum {
    FDAP_BOTTOM = 0x00000000,
    FDAP_TOP = 0x00000001
} FDAP;
typedef enum {
    FDESVR_DEFAULT = 0x00000000,
    FDESVR_ACCEPT = 0x00000001,
    FDESVR_REFUSE = 0x00000002
} FDE_SHAREVIOLATION_RESPONSE;
typedef FDE_SHAREVIOLATION_RESPONSE FDE_OVERWRITE_RESPONSE;

//the structs
typedef struct {
    LPCWSTR pszName;
    LPCWSTR pszSpec;
} qt_COMDLG_FILTERSPEC;
typedef struct {
    GUID fmtid;
    DWORD pid;
} qt_PROPERTYKEY;

typedef struct {
    USHORT      cb;
    BYTE        abID[1];
} qt_SHITEMID, *qt_LPSHITEMID;
typedef struct {
    qt_SHITEMID mkid;
} qt_ITEMIDLIST, *qt_LPITEMIDLIST;
typedef const qt_ITEMIDLIST *qt_LPCITEMIDLIST;
typedef struct {
    HWND          hwndOwner;
    qt_LPCITEMIDLIST pidlRoot;
    LPWSTR        pszDisplayName;
    LPCWSTR       lpszTitle;
    UINT          ulFlags;
    BFFCALLBACK   lpfn;
    LPARAM        lParam;
    int           iImage;
} qt_BROWSEINFO;

DECLARE_INTERFACE(IFileDialogEvents);

DECLARE_INTERFACE_(IShellItem, IUnknown)
{
    STDMETHOD(BindToHandler)(THIS_ IBindCtx *pbc, REFGUID bhid, REFIID riid, void **ppv) PURE;
    STDMETHOD(GetParent)(THIS_ IShellItem **ppsi) PURE;
    STDMETHOD(GetDisplayName)(THIS_ SIGDN sigdnName, LPWSTR *ppszName) PURE;
    STDMETHOD(GetAttributes)(THIS_ ULONG sfgaoMask, ULONG *psfgaoAttribs) PURE;
    STDMETHOD(Compare)(THIS_ IShellItem *psi, DWORD hint, int *piOrder) PURE;
};

DECLARE_INTERFACE_(IShellItemFilter, IUnknown)
{
    STDMETHOD(IncludeItem)(THIS_ IShellItem *psi) PURE;
    STDMETHOD(GetEnumFlagsForItem)(THIS_ IShellItem *psi, DWORD *pgrfFlags) PURE;
};

DECLARE_INTERFACE_(IEnumShellItems, IUnknown)
{
    STDMETHOD(Next)(THIS_ ULONG celt, IShellItem **rgelt, ULONG *pceltFetched) PURE;
    STDMETHOD(Skip)(THIS_ ULONG celt) PURE;
    STDMETHOD(Reset)(THIS_) PURE;
    STDMETHOD(Clone)(THIS_ IEnumShellItems **ppenum) PURE;
};

DECLARE_INTERFACE_(IShellItemArray, IUnknown)
{
    STDMETHOD(BindToHandler)(THIS_ IBindCtx *pbc, REFGUID rbhid, REFIID riid, void **ppvOut) PURE;
    STDMETHOD(GetPropertyStore)(THIS_ GETPROPERTYSTOREFLAGS flags, REFIID riid, void **ppv) PURE;
    STDMETHOD(GetPropertyDescriptionList)(THIS_ const qt_PROPERTYKEY *keyType, REFIID riid, void **ppv) PURE;
    STDMETHOD(GetAttributes)(THIS_ SIATTRIBFLAGS dwAttribFlags, ULONG sfgaoMask, ULONG *psfgaoAttribs) PURE;
    STDMETHOD(GetCount)(THIS_ DWORD *pdwNumItems) PURE;
    STDMETHOD(GetItemAt)(THIS_ DWORD dwIndex, IShellItem **ppsi) PURE;
    STDMETHOD(EnumItems)(THIS_ IEnumShellItems **ppenumShellItems) PURE;
};

DECLARE_INTERFACE_(IModalWindow, IUnknown)
{
    STDMETHOD(Show)(THIS_ HWND hwndParent) PURE;
};

DECLARE_INTERFACE_(IFileDialog, IModalWindow)
{
    STDMETHOD(SetFileTypes)(THIS_ UINT cFileTypes, const COMDLG_FILTERSPEC *rgFilterSpec) PURE;
    STDMETHOD(SetFileTypeIndex)(THIS_ UINT iFileType) PURE;
    STDMETHOD(GetFileTypeIndex)(THIS_ UINT *piFileType) PURE;
    STDMETHOD(Advise)(THIS_ IFileDialogEvents *pfde, DWORD *pdwCookie) PURE;
    STDMETHOD(Unadvise)(THIS_ DWORD dwCookie) PURE;
    STDMETHOD(SetOptions)(THIS_ DWORD fos) PURE;
    STDMETHOD(GetOptions)(THIS_ DWORD *pfos) PURE;
    STDMETHOD(SetDefaultFolder)(THIS_ IShellItem *psi) PURE;
    STDMETHOD(SetFolder)(THIS_ IShellItem *psi) PURE;
    STDMETHOD(GetFolder)(THIS_ IShellItem **ppsi) PURE;
    STDMETHOD(GetCurrentSelection)(THIS_ IShellItem **ppsi) PURE;
    STDMETHOD(SetFileName)(THIS_ LPCWSTR pszName) PURE;
    STDMETHOD(GetFileName)(THIS_ LPWSTR *pszName) PURE;
    STDMETHOD(SetTitle)(THIS_ LPCWSTR pszTitle) PURE;
    STDMETHOD(SetOkButtonLabel)(THIS_ LPCWSTR pszText) PURE;
    STDMETHOD(SetFileNameLabel)(THIS_ LPCWSTR pszLabel) PURE;
    STDMETHOD(GetResult)(THIS_ IShellItem **ppsi) PURE;
    STDMETHOD(AddPlace)(THIS_ IShellItem *psi, FDAP fdap) PURE;
    STDMETHOD(SetDefaultExtension)(THIS_ LPCWSTR pszDefaultExtension) PURE;
    STDMETHOD(Close)(THIS_ HRESULT hr) PURE;
    STDMETHOD(SetClientGuid)(THIS_ REFGUID guid) PURE;
    STDMETHOD(ClearClientData)(THIS_) PURE;
    STDMETHOD(SetFilter)(THIS_ IShellItemFilter *pFilter) PURE;
};

DECLARE_INTERFACE_(IFileDialogEvents, IUnknown)
{
    STDMETHOD(OnFileOk)(THIS_ IFileDialog *pfd) PURE;
    STDMETHOD(OnFolderChanging)(THIS_ IFileDialog *pfd, IShellItem *psiFolder) PURE;
    STDMETHOD(OnFolderChange)(THIS_ IFileDialog *pfd) PURE;
    STDMETHOD(OnSelectionChange)(THIS_ IFileDialog *pfd) PURE;
    STDMETHOD(OnShareViolation)(THIS_ IFileDialog *pfd, IShellItem *psi, FDE_SHAREVIOLATION_RESPONSE *pResponse) PURE;
    STDMETHOD(OnTypeChange)(THIS_ IFileDialog *pfd) PURE;
    STDMETHOD(OnOverwrite)(THIS_ IFileDialog *pfd, IShellItem *psi, FDE_OVERWRITE_RESPONSE *pResponse) PURE;
};

DECLARE_INTERFACE_(IFileOpenDialog, IFileDialog)
{
    STDMETHOD(GetResults)(THIS_ IShellItemArray **ppenum) PURE;
    STDMETHOD(GetSelectedItems)(THIS_ IShellItemArray **ppsai) PURE;
};

typedef IUnknown IPropertyStore;
typedef IUnknown IFileOperationProgressSink;

DECLARE_INTERFACE_(IFileSaveDialog, IFileDialog)
{
public:
    STDMETHOD(SetSaveAsItem)(THIS_ IShellItem *psi) PURE;
    STDMETHOD(SetProperties)(THIS_ IPropertyStore *pStore) PURE;
    STDMETHOD(SetCollectedProperties)(THIS_ IPropertyStore *pStore) PURE;
    STDMETHOD(GetProperties)(THIS_ IPropertyStore **ppStore) PURE;
    STDMETHOD(ApplyProperties)(THIS_ IShellItem *psi, IPropertyStore *pStore, HWND hwnd, IFileOperationProgressSink *pSink) PURE;
};

#endif // Q_CC_MINGW

QT_BEGIN_NAMESPACE

/* Output UID (IID, CLSID) as C++ constants.
 * The constants are contained in the Windows SDK libs, but not for MinGW. */
static inline QString guidToString(const GUID &g)
{
    QString rc;
    QTextStream str(&rc);
    str.setIntegerBase(16);
    str.setNumberFlags(str.numberFlags() | QTextStream::ShowBase);
    str << '{' << g.Data1 << ", " << g.Data2 << ", " << g.Data3;
    str.setFieldWidth(2);
    str.setFieldAlignment(QTextStream::AlignRight);
    str.setPadChar(QLatin1Char('0'));
    str << ",{" << g.Data4[0] << ", " << g.Data4[1]  << ", " << g.Data4[2]  << ", " << g.Data4[3]
        << ", " << g.Data4[4] << ", " << g.Data4[5]  << ", " << g.Data4[6]  << ", " << g.Data4[7]
        << "}};";
    return rc;
}

inline QDebug operator<<(QDebug d, const GUID &g)
{ d.nospace() << guidToString(g); return d; }

namespace QWindowsDialogs
{
/*!
    \fn eatMouseMove()

    After closing a windows dialog with a double click (i.e. open a file)
    the message queue still contains a dubious WM_MOUSEMOVE message where
    the left button is reported to be down (wParam != 0).
    remove all those messages (usually 1) and post the last one with a
    reset button state.

    \ingroup qt-lighthouse-win
*/

void eatMouseMove()
{
    MSG msg = {0, 0, 0, 0, 0, {0, 0} };
    while (PeekMessage(&msg, 0, WM_MOUSEMOVE, WM_MOUSEMOVE, PM_REMOVE))
        ;
    if (msg.message == WM_MOUSEMOVE)
        PostMessage(msg.hwnd, msg.message, 0, msg.lParam);
    if (QWindowsContext::verboseDialogs)
        qDebug("%s triggered=%d" , __FUNCTION__, msg.message == WM_MOUSEMOVE);
}

} // namespace QWindowsDialogs

/*!
    \class QWindowsNativeDialogBase
    \brief Base class for Windows native dialogs.

    Base clases for native dialogs that mimick the
    behaviour of their QDialog counterparts as close as
    possible.

    A major difference is that there is only an exec(), which
    is a modal, blocking call; there is no non-blocking show().
    There 2 types of native dialogs:

    \list
    \o Dialogs provided by the Comdlg32 library (ChooseColor,
       ChooseFont). They only provide a modal, blocking
       function call (with idle processing).
    \o File dialogs are classes derived from IFileDialog. They
       inherit IModalWindow and their exec() method (calling
       IModalWindow::Show()) is similarly blocking, but methods
       like close() can be called on them from event handlers.
    \endlist

    \ingroup qt-lighthouse-win
*/

class QWindowsNativeDialogBase : public QObject
{
    Q_OBJECT
public:
    virtual void setWindowTitle(const QString &title) = 0;
    virtual void exec(HWND owner = 0) = 0;
    virtual QPlatformDialogHelper::DialogCode result() const = 0;

signals:
    void accepted();
    void rejected();

public slots:
    virtual void close() = 0;

protected:
    QWindowsNativeDialogBase() {}
};

/*!
    \class QWindowsDialogHelperBase
    \brief Helper for native Windows dialogs.

    Provides basic functionality and introduces new virtuals.
    The native dialog is created in setVisible_sys() since
    then modality and the state of DontUseNativeDialog is known.

    Modal dialogs are then started via the platformNativeDialogModalHelp(),
    platformNativeDialogModalHelp() slots.
    Non-modal dialogs are shown using a separate thread should
    they support it.

    \sa QWindowsDialogThread
    \ingroup qt-lighthouse-win
*/

template <class BaseClass>
QWindowsDialogHelperBase<BaseClass>::QWindowsDialogHelperBase() :
    m_nativeDialog(0),
    m_ownerWindow(0)
{
}

template <class BaseClass>
QWindowsNativeDialogBase *QWindowsDialogHelperBase<BaseClass>::nativeDialog() const
{
    if (!m_nativeDialog) {
         qWarning("%s invoked with no native dialog present.", __FUNCTION__);
         return 0;
    }
    return m_nativeDialog;
}

template <class BaseClass>
QWindowsNativeDialogBase *QWindowsDialogHelperBase<BaseClass>::ensureNativeDialog()
{
    // Create dialog and apply common settings.
    if (!m_nativeDialog)
        m_nativeDialog = createNativeDialog();
    return m_nativeDialog;
}

template <class BaseClass>
void QWindowsDialogHelperBase<BaseClass>::deleteNativeDialog_sys()
{
    if (QWindowsContext::verboseDialogs)
        qDebug("%s" , __FUNCTION__);
    delete m_nativeDialog;
    m_nativeDialog = 0;
}

/*!
    \class QWindowsDialogThread
    \brief Run a non-modal native dialog in a separate thread.

    \sa QWindowsDialogHelperBase
    \ingroup qt-lighthouse-win
*/

class QWindowsDialogThread : public QThread
{
public:
    QWindowsDialogThread(QWindowsNativeDialogBase *dialog,
                             HWND owner = 0) :
        m_dialog(dialog), m_owner(owner) {}

    void run();

private:
    QWindowsNativeDialogBase *m_dialog;
    const HWND m_owner;
};

void QWindowsDialogThread::run()
{
    if (QWindowsContext::verboseDialogs)
        qDebug(">%s" , __FUNCTION__);
    m_dialog->exec(m_owner);
    deleteLater();
    if (QWindowsContext::verboseDialogs)
        qDebug("<%s" , __FUNCTION__);
}

template <class BaseClass>
bool QWindowsDialogHelperBase<BaseClass>::show_sys(QPlatformDialogHelper::ShowFlags flags,
                                                   Qt::WindowFlags,
                                                   QWindow *parent)
{
    const bool modal = flags & QPlatformDialogHelper::ShowModal;
    if (parent) {
        m_ownerWindow = QWindowsWindow::handleOf(parent);
    } else {
        m_ownerWindow = 0;
    }
    if (QWindowsContext::verboseDialogs)
        qDebug("%s modal=%d native=%p parent=%p" ,
               __FUNCTION__, modal, m_nativeDialog, m_ownerWindow);
    if (!modal && !supportsNonModalDialog())
        return false; // Was it changed in-between?
    if (!ensureNativeDialog())
        return false;
    if (!modal) { // Modal dialogs are shown in separate slot.
        QWindowsDialogThread *thread = new QWindowsDialogThread(m_nativeDialog, m_ownerWindow);
        thread->start();
    }
    return true;
}

template <class BaseClass>
void QWindowsDialogHelperBase<BaseClass>::hide_sys()
{
    if (m_nativeDialog)
        m_nativeDialog->close();
    m_ownerWindow = 0;
}

template <class BaseClass>
void QWindowsDialogHelperBase<BaseClass>::platformNativeDialogModalHelp()
{
    if (QWindowsContext::verboseDialogs)
        qDebug("%s" , __FUNCTION__);
    if (QWindowsNativeDialogBase *nd =nativeDialog())
        nd->metaObject()->invokeMethod(this,
                                       "emitLaunchNativeAppModalPanel",
                                       Qt::QueuedConnection);
}

template <class BaseClass>
void QWindowsDialogHelperBase<BaseClass>::_q_platformRunNativeAppModalPanel()
{
    if (QWindowsNativeDialogBase *nd =nativeDialog())
        nd->exec(m_ownerWindow);
}

template <class BaseClass>
QPlatformDialogHelper::DialogCode QWindowsDialogHelperBase<BaseClass>::dialogResultCode_sys()
{
    if (QWindowsNativeDialogBase *nd =nativeDialog())
        return nd->result();
    return QPlatformDialogHelper::Rejected;
}

static inline bool snapToDefaultButtonHint()
{
    BOOL snapToDefault = false;
    if (SystemParametersInfo(SPI_GETSNAPTODEFBUTTON, 0, &snapToDefault, 0))
        return snapToDefault;
    return false;
}

template <class BaseClass>
QVariant QWindowsDialogHelperBase<BaseClass>::styleHint(QPlatformDialogHelper::StyleHint hint) const
{
    switch (hint) {
    case QPlatformDialogHelper::SnapToDefaultButton:
        return QVariant(snapToDefaultButtonHint());
    }
    return BaseClass::styleHint(hint);
}

/*!
    \class QWindowsNativeFileDialogEventHandler
    \brief Listens to IFileDialog events and forwards them to QWindowsNativeFileDialogBase

    Events like 'folder change' that have an equivalent signal
    in QFileDialog are forwarded.

    \sa QWindowsNativeFileDialogBase, QWindowsFileDialogHelper

    \ingroup qt-lighthouse-win
*/

class QWindowsNativeFileDialogBase;

class QWindowsNativeFileDialogEventHandler : public IFileDialogEvents
{
public:
    static IFileDialogEvents *create(QWindowsNativeFileDialogBase *nativeFileDialog);

    // IUnknown methods
    IFACEMETHODIMP QueryInterface(REFIID riid, void** ppv)
    {
        if (riid != IID_IUnknown && riid != IID_IFileDialogEvents) {
            *ppv = NULL;
            return ResultFromScode(E_NOINTERFACE);
        }
        *ppv = this;
        AddRef();
        return NOERROR;
    }

    IFACEMETHODIMP_(ULONG) AddRef() { return InterlockedIncrement(&m_ref); }

    IFACEMETHODIMP_(ULONG) Release()
    {
        const long ref = InterlockedDecrement(&m_ref);
        if (!ref)
            delete this;
        return ref;
    }

    // IFileDialogEvents methods
    IFACEMETHODIMP OnFileOk(IFileDialog *) { return S_OK; }
    IFACEMETHODIMP OnFolderChange(IFileDialog *) { return S_OK; }
    IFACEMETHODIMP OnFolderChanging(IFileDialog *, IShellItem *);
    IFACEMETHODIMP OnHelp(IFileDialog *) { return S_OK; }
    IFACEMETHODIMP OnSelectionChange(IFileDialog *);
    IFACEMETHODIMP OnShareViolation(IFileDialog *, IShellItem *, FDE_SHAREVIOLATION_RESPONSE *) { return S_OK; }
    IFACEMETHODIMP OnTypeChange(IFileDialog *);
    IFACEMETHODIMP OnOverwrite(IFileDialog *, IShellItem *, FDE_OVERWRITE_RESPONSE *) { return S_OK; }

    QWindowsNativeFileDialogEventHandler(QWindowsNativeFileDialogBase *nativeFileDialog) :
        m_ref(1), m_nativeFileDialog(nativeFileDialog) {}
    ~QWindowsNativeFileDialogEventHandler() {}

private:
    long m_ref;
    QWindowsNativeFileDialogBase *m_nativeFileDialog;
};

IFileDialogEvents *QWindowsNativeFileDialogEventHandler::create(QWindowsNativeFileDialogBase *nativeFileDialog)
{
    IFileDialogEvents *result;
    QWindowsNativeFileDialogEventHandler *eventHandler = new QWindowsNativeFileDialogEventHandler(nativeFileDialog);
    if (FAILED(eventHandler->QueryInterface(IID_IFileDialogEvents, reinterpret_cast<void **>(&result)))) {
        qErrnoWarning("%s: Unable to obtain IFileDialogEvents");
        return 0;
    }
    eventHandler->Release();
    return result;
}

/*!
    \class QWindowsNativeFileDialogBase
    \brief Windows native file dialog wrapper around IFileOpenDialog, IFileSaveDialog.

    Provides convenience methods.
    Note that only IFileOpenDialog has multi-file functionality.

    \sa QWindowsNativeFileDialogEventHandler, QWindowsFileDialogHelper
    \ingroup qt-lighthouse-win
*/

class QWindowsNativeFileDialogBase : public QWindowsNativeDialogBase
{
    Q_OBJECT
    Q_PROPERTY(bool hideFiltersDetails READ hideFiltersDetails WRITE setHideFiltersDetails)
public:
    ~QWindowsNativeFileDialogBase();

    inline static QWindowsNativeFileDialogBase *create(QFileDialogOptions::AcceptMode am);

    virtual void setWindowTitle(const QString &title);
    inline void setMode(QFileDialogOptions::FileMode mode, QFileDialogOptions::FileDialogOptions options);
    inline void setDirectory(const QString &directory);
    inline QString directory() const;
    virtual void exec(HWND owner = 0);
    inline void setNameFilters(const QStringList &f);
    inline void selectNameFilter(const QString &filter);
    inline QString selectedNameFilter() const;
    bool hideFiltersDetails() const    { return m_hideFiltersDetails; }
    void setHideFiltersDetails(bool h) { m_hideFiltersDetails = h; }
    void setDefaultSuffix(const QString &s);
    inline void setLabelText(QFileDialogOptions::DialogLabel l, const QString &text);

    virtual QPlatformDialogHelper::DialogCode result() const
        { return fileResult(); }
    virtual QPlatformDialogHelper::DialogCode fileResult(QStringList *fileResult = 0) const = 0;
    virtual QStringList selectedFiles() const = 0;

    inline void onFolderChange(IShellItem *);
    inline void onSelectionChange();
    inline void onTypeChange();

signals:
    void directoryEntered(const QString& directory);
    void currentChanged(const QString& file);
    void filterSelected(const QString & filter);

public slots:
    virtual void close() { m_fileDialog->Close(S_OK); }

protected:
    QWindowsNativeFileDialogBase();
    bool init(const CLSID &clsId, const IID &iid);
    inline IFileDialog * fileDialog() const { return m_fileDialog; }
    static QString itemPath(IShellItem *item);
    static int itemPaths(IShellItemArray *items, QStringList *fileResult = 0);
    static IShellItem *shellItem(const QString &path);

private:
    IFileDialog *m_fileDialog;
    IFileDialogEvents *m_dialogEvents;
    DWORD m_cookie;
    QStringList m_nameFilters;
    bool m_hideFiltersDetails;
};

QWindowsNativeFileDialogBase::QWindowsNativeFileDialogBase() :
    m_fileDialog(0), m_dialogEvents(0), m_cookie(0), m_hideFiltersDetails(false)
{
}

QWindowsNativeFileDialogBase::~QWindowsNativeFileDialogBase()
{
    if (m_dialogEvents && m_fileDialog)
        m_fileDialog->Unadvise(m_cookie);
    if (m_dialogEvents)
        m_dialogEvents->Release();
    if (m_fileDialog)
        m_fileDialog->Release();
}

bool QWindowsNativeFileDialogBase::init(const CLSID &clsId, const IID &iid)
{
    HRESULT hr = CoCreateInstance(clsId, NULL, CLSCTX_INPROC_SERVER,
                                  iid, reinterpret_cast<void **>(&m_fileDialog));
    if (FAILED(hr)) {
        qErrnoWarning("%s: CoCreateInstance failed");
        return false;
    }
    m_dialogEvents = QWindowsNativeFileDialogEventHandler::create(this);
    if (!m_dialogEvents)
        return false;
    // Register event handler
    hr = m_fileDialog->Advise(m_dialogEvents, &m_cookie);
    if (FAILED(hr)) {
        qErrnoWarning("%s: IFileDialog::Advise failed");
        return false;
    }
    if (QWindowsContext::verboseDialogs)
        qDebug("%s %p %p cookie=%lu" , __FUNCTION__, m_fileDialog, m_dialogEvents, m_cookie);

    return true;
}

void QWindowsNativeFileDialogBase::setWindowTitle(const QString &title)
{
    m_fileDialog->SetTitle(reinterpret_cast<const wchar_t *>(title.utf16()));
}

IShellItem *QWindowsNativeFileDialogBase::shellItem(const QString &path)
{
    if (QWindowsContext::shell32dll.sHCreateItemFromParsingName) {
        IShellItem *result = 0;
        const QString native = QDir::toNativeSeparators(path);
        const HRESULT hr =
            QWindowsContext::shell32dll.sHCreateItemFromParsingName(reinterpret_cast<const wchar_t *>(native.utf16()),
                                                                    NULL, IID_IShellItem,
                                                                    reinterpret_cast<void **>(&result));
        if (SUCCEEDED(hr))
            return result;
    }
    qErrnoWarning("%s: SHCreateItemFromParsingName()) failed", __FUNCTION__);
    return 0;
}

void QWindowsNativeFileDialogBase::setDirectory(const QString &directory)
{
    if (IShellItem *psi = QWindowsNativeFileDialogBase::shellItem(directory)) {
        m_fileDialog->SetFolder(psi);
        psi->Release();
    }
}

QString QWindowsNativeFileDialogBase::directory() const
{
    IShellItem *item = 0;
    return (SUCCEEDED(m_fileDialog) && item) ?
        QWindowsNativeFileDialogBase::itemPath(item) : QString();
}

void QWindowsNativeFileDialogBase::exec(HWND owner)
{
    if (QWindowsContext::verboseDialogs)
        qDebug(">%s on %p", __FUNCTION__, (void *)owner);
    const HRESULT hr = m_fileDialog->Show(owner);
    QWindowsDialogs::eatMouseMove();
    if (QWindowsContext::verboseDialogs)
        qDebug("<%s returns 0x%lx", __FUNCTION__, hr);
    if (hr == S_OK) {
        emit accepted();
    } else {
        emit rejected();
    }
}

void QWindowsNativeFileDialogBase::setMode(QFileDialogOptions::FileMode mode, QFileDialogOptions::FileDialogOptions options)
{
    DWORD flags = FOS_PATHMUSTEXIST | FOS_FORCESHOWHIDDEN;
    if (options & QFileDialogOptions::DontResolveSymlinks)
        flags |= FOS_NODEREFERENCELINKS;
    switch (mode) {
    case QFileDialogOptions::AnyFile:
        flags |= FOS_NOREADONLYRETURN;
        if (!(options & QFileDialogOptions::DontConfirmOverwrite))
            flags |= FOS_OVERWRITEPROMPT;
        break;
    case QFileDialogOptions::ExistingFile:
        flags |= FOS_FILEMUSTEXIST;
        break;
    case QFileDialogOptions::Directory:
    case QFileDialogOptions::DirectoryOnly:
        flags |= FOS_PICKFOLDERS | FOS_FILEMUSTEXIST;
        break;
    case QFileDialogOptions::ExistingFiles:
        flags |= FOS_FILEMUSTEXIST | FOS_ALLOWMULTISELECT;
        break;
    }
    if (QWindowsContext::verboseDialogs)
        qDebug().nospace()
            << __FUNCTION__ << " mode=" << mode << " options"
            << options << " results in 0x" << flags;

    if (FAILED(m_fileDialog->SetOptions(flags)))
        qErrnoWarning("%s: SetOptions() failed", __FUNCTION__);
}

QString QWindowsNativeFileDialogBase::itemPath(IShellItem *item)
{
    QString result;
    LPWSTR name = 0;
    if (SUCCEEDED(item->GetDisplayName(SIGDN_FILESYSPATH, &name))) {
        result = QDir::cleanPath(QString::fromWCharArray(name));
        CoTaskMemFree(name);
    }
    return result;
}

int QWindowsNativeFileDialogBase::itemPaths(IShellItemArray *items,
                                            QStringList *result /* = 0 */)
{
    DWORD itemCount = 0;
    if (result)
        result->clear();
    if (FAILED(items->GetCount(&itemCount)))
        return 0;
    if (result && itemCount) {
        result->reserve(itemCount);
        for (DWORD i = 0; i < itemCount; ++i) {
            IShellItem *item = 0;
            if (SUCCEEDED(items->GetItemAt(i, &item)))
                result->push_back(QWindowsNativeFileDialogBase::itemPath(item));
        }
   }
    return itemCount;
}

// Copy a string to an Utf16 buffer.
static inline void toBuffer(const QString &what, WCHAR **ptr)
{
    const int length = 1 + what.size();
    qMemCopy(*ptr, what.utf16(), length * sizeof(WCHAR));
    *ptr += length;
}

void QWindowsNativeFileDialogBase::setNameFilters(const QStringList &filters)
{
    /* Populates an array of COMDLG_FILTERSPEC from list of filters,
     * store the strings in a flat, contiguous buffer. */
    m_nameFilters = filters;
    const int size = filters.size();
    int totalStringLength = 0;
    for (int i = 0; i < size; ++i)
        totalStringLength += filters.at(i).size();

    QScopedArrayPointer<WCHAR> buffer(new WCHAR[totalStringLength * 2 + 2 * size]);
    QScopedArrayPointer<COMDLG_FILTERSPEC> comFilterSpec(new COMDLG_FILTERSPEC[size]);

    const QString matchesAll = QStringLiteral(" (*)");
    const QRegExp filterSeparatorRE(QStringLiteral("; *"));
    const QString separator = QStringLiteral(";");
    Q_ASSERT(filterSeparatorRE.isValid());

    WCHAR *ptr = buffer.data();
    // Split filter specification as 'Texts (*.txt[;] *.doc)'
    // into description and filters specification as '*.txt;*.doc'
    for (int i = 0; i < size; ++i) {
        QString filterString = filters.at(i);
        const int openingParenPos = filterString.lastIndexOf(QLatin1Char('('));
        const int closingParenPos = openingParenPos != -1 ?
            filterString.indexOf(QLatin1Char(')'), openingParenPos + 1) : -1;
        QString filterSpec = closingParenPos == -1 ?
            QString(QLatin1Char('*')) : filterString.mid(openingParenPos + 1, closingParenPos - openingParenPos - 1);
        filterSpec.replace(filterSeparatorRE, separator);
        if (m_hideFiltersDetails) {
            // Do not show pattern in description
            if (openingParenPos != -1) {
                filterString.truncate(openingParenPos);
                while (filterString.endsWith(QLatin1Char(' ')))
                    filterString.truncate(filterString.size() - 1);
            }
        } else {
            // Display glitch: 'All files (*)' shows up as 'All files (*) (*)'
            if (filterString.endsWith(matchesAll))
                filterString.truncate(filterString.size() - matchesAll.size());
        }
        // Add to buffer.
        comFilterSpec[i].pszName = ptr;
        toBuffer(filterString, &ptr);
        comFilterSpec[i].pszSpec = ptr;
        toBuffer(filterSpec, &ptr);
    }

    m_fileDialog->SetFileTypes(size, comFilterSpec.data());
}

void QWindowsNativeFileDialogBase::setDefaultSuffix(const QString &s)
{
    wchar_t *wSuffix = const_cast<wchar_t *>(reinterpret_cast<const wchar_t *>(s.utf16()));
    m_fileDialog->SetDefaultExtension(wSuffix);
}

void QWindowsNativeFileDialogBase::setLabelText(QFileDialogOptions::DialogLabel l, const QString &text)
{
    wchar_t *wText = const_cast<wchar_t *>(reinterpret_cast<const wchar_t *>(text.utf16()));
    switch (l) {
        break;
    case QFileDialogOptions::FileName:
        m_fileDialog->SetFileNameLabel(wText);
        break;
    case QFileDialogOptions::Accept:
        m_fileDialog->SetOkButtonLabel(wText);
        break;
    case QFileDialogOptions::LookIn:
    case QFileDialogOptions::Reject:
    case QFileDialogOptions::FileType:
    case QFileDialogOptions::DialogLabelCount:
        break;
    }
}

void QWindowsNativeFileDialogBase::selectNameFilter(const QString &filter)
{
    const int index = m_nameFilters.indexOf(filter);
    if (index >= 0) {
        m_fileDialog->SetFileTypeIndex(index + 1); // one-based.
    } else {
        qWarning("%s: Invalid parameter '%s' not found in '%s'.",
                 __FUNCTION__, qPrintable(filter),
                 qPrintable(m_nameFilters.join(QStringLiteral(", "))));
    }
}

QString QWindowsNativeFileDialogBase::selectedNameFilter() const
{
    UINT uIndex = 0;
    if (SUCCEEDED(m_fileDialog->GetFileTypeIndex(&uIndex))) {
        const int index = uIndex - 1; // one-based
        if (index < m_nameFilters.size())
            return m_nameFilters.at(index);
    }
    return QString();
}

void QWindowsNativeFileDialogBase::onFolderChange(IShellItem *item)
{
    if (item) {
        const QString directory = QWindowsNativeFileDialogBase::itemPath(item);
        emit directoryEntered(directory);
    }
}

void QWindowsNativeFileDialogBase::onSelectionChange()
{
    const QStringList current = selectedFiles();
    if (current.size() == 1)
        emit currentChanged(current.front());
}

void QWindowsNativeFileDialogBase::onTypeChange()
{
    emit filterSelected(selectedNameFilter());
}

HRESULT QWindowsNativeFileDialogEventHandler::OnFolderChanging(IFileDialog *, IShellItem *item)
{
    m_nativeFileDialog->onFolderChange(item);
    return S_OK;
}

HRESULT QWindowsNativeFileDialogEventHandler::OnSelectionChange(IFileDialog *)
{
    m_nativeFileDialog->onSelectionChange();
    return S_OK;
}

HRESULT QWindowsNativeFileDialogEventHandler::OnTypeChange(IFileDialog *)
{
    m_nativeFileDialog->onTypeChange();
    return S_OK;
}

/*!
    \class QWindowsNativeSaveFileDialog
    \brief Windows native file save dialog wrapper around IFileSaveDialog.

    Implements single-selection methods.

    \ingroup qt-lighthouse-win
*/

class QWindowsNativeSaveFileDialog : public QWindowsNativeFileDialogBase
{
public:
    virtual QPlatformDialogHelper::DialogCode fileResult(QStringList *fileResult = 0) const;
    virtual QStringList selectedFiles() const;
};

QPlatformDialogHelper::DialogCode QWindowsNativeSaveFileDialog::fileResult(QStringList *result /* = 0 */) const
{
    if (result)
        result->clear();
    IShellItem *item = 0;
    const HRESULT hr = fileDialog()->GetResult(&item);
    if (FAILED(hr) || !item)
        return QPlatformDialogHelper::Rejected;
    if (result)
        result->push_back(QWindowsNativeFileDialogBase::itemPath(item));
    return QPlatformDialogHelper::Accepted;
}

QStringList QWindowsNativeSaveFileDialog::selectedFiles() const
{
    QStringList result;
    IShellItem *item = 0;
    const HRESULT hr = fileDialog()->GetCurrentSelection(&item);
    if (SUCCEEDED(hr) && item)
        result.push_back(QWindowsNativeSaveFileDialog::itemPath(item));
    return result;
}

/*!
    \class QWindowsNativeOpenFileDialog
    \brief Windows native file save dialog wrapper around IFileOpenDialog.

    Implements multi-selection methods.

    \ingroup qt-lighthouse-win
*/

class QWindowsNativeOpenFileDialog : public QWindowsNativeFileDialogBase
{
public:
    virtual QPlatformDialogHelper::DialogCode fileResult(QStringList *fileResult = 0) const;
    virtual QStringList selectedFiles() const;

private:
    inline IFileOpenDialog *openFileDialog() const
        { return static_cast<IFileOpenDialog *>(fileDialog()); }
};

QPlatformDialogHelper::DialogCode QWindowsNativeOpenFileDialog::fileResult(QStringList *result /* = 0 */) const
{
    if (result)
        result->clear();
    IShellItemArray *items = 0;
    const HRESULT hr = openFileDialog()->GetResults(&items);
    if (SUCCEEDED(hr) && items && QWindowsNativeFileDialogBase::itemPaths(items, result) > 0)
        return QPlatformDialogHelper::Accepted;
    return QPlatformDialogHelper::Rejected;
}

QStringList QWindowsNativeOpenFileDialog::selectedFiles() const
{
    QStringList result;
    IShellItemArray *items = 0;
    const HRESULT hr = openFileDialog()->GetSelectedItems(&items);
    if (SUCCEEDED(hr) && items)
        QWindowsNativeFileDialogBase::itemPaths(items, &result);
    return result;
}

/*!
    \brief Factory method for QWindowsNativeFileDialogBase returning
    QWindowsNativeOpenFileDialog or QWindowsNativeSaveFileDialog depending on
    QFileDialog::AcceptMode.
*/

QWindowsNativeFileDialogBase *QWindowsNativeFileDialogBase::create(QFileDialogOptions::AcceptMode am)
{
    QWindowsNativeFileDialogBase *result = 0;
    if (am == QFileDialogOptions::AcceptOpen) {
        result = new QWindowsNativeOpenFileDialog;
        if (!result->init(CLSID_FileOpenDialog, IID_IFileOpenDialog)) {
            delete result;
            return 0;
        }
    } else {
        result = new QWindowsNativeSaveFileDialog;
        if (!result->init(CLSID_FileSaveDialog, IID_IFileSaveDialog)) {
            delete result;
            return 0;
        }
    }
    return result;
}

/*!
    \class QWindowsFileDialogHelper
    \brief Helper for native Windows file dialogs

    \ingroup qt-lighthouse-win
*/

class QWindowsFileDialogHelper : public QWindowsDialogHelperBase<QPlatformFileDialogHelper>
{
public:
    QWindowsFileDialogHelper() {}

    virtual bool defaultNameFilterDisables() const
        { return true; }
    virtual void setDirectory_sys(const QString &directory);
    virtual QString directory_sys() const;
    virtual void selectFile_sys(const QString &filename);
    virtual QStringList selectedFiles_sys() const;
    virtual void setFilter_sys();
    virtual void setNameFilters_sys(const QStringList &filters);
    virtual void selectNameFilter_sys(const QString &filter);
    virtual QString selectedNameFilter_sys() const;

private:
    virtual QWindowsNativeDialogBase *createNativeDialog();
    inline QWindowsNativeFileDialogBase *nativeFileDialog() const
        { return static_cast<QWindowsNativeFileDialogBase *>(nativeDialog()); }
};

QWindowsNativeDialogBase *QWindowsFileDialogHelper::createNativeDialog()
{
    QWindowsNativeFileDialogBase *result = QWindowsNativeFileDialogBase::create(options()->acceptMode());
    if (!result)
        return 0;
    QObject::connect(result, SIGNAL(accepted()), this, SIGNAL(accept()),
                     Qt::QueuedConnection);
    QObject::connect(result, SIGNAL(rejected()), this, SIGNAL(reject()),
                     Qt::QueuedConnection);
    QObject::connect(result, SIGNAL(directoryEntered(QString)),
                     this, SIGNAL(directoryEntered(QString)),
                     Qt::QueuedConnection);
    QObject::connect(result, SIGNAL(currentChanged(QString)),
                     this, SIGNAL(currentChanged(QString)),
                     Qt::QueuedConnection);
    QObject::connect(result, SIGNAL(filterSelected(QString)),
                     this, SIGNAL(filterSelected(QString)),
                     Qt::QueuedConnection);

    // Apply settings.
    const QSharedPointer<QFileDialogOptions> &opts = options();
    result->setWindowTitle(opts->windowTitle());
    result->setMode(opts->fileMode(), opts->options());
    result->setHideFiltersDetails(opts->testOption(QFileDialogOptions::HideNameFilterDetails));
    const QStringList nameFilters = opts->nameFilters();
    if (!nameFilters.isEmpty())
        result->setNameFilters(nameFilters);
    if (opts->isLabelExplicitlySet(QFileDialogOptions::FileName))
        result->setLabelText(QFileDialogOptions::FileName, opts->labelText(QFileDialogOptions::FileName));
    if (opts->isLabelExplicitlySet(QFileDialogOptions::Accept))
        result->setLabelText(QFileDialogOptions::Accept, opts->labelText(QFileDialogOptions::Accept));
    const QString initialDirectory = opts->initialDirectory();
    if (!initialDirectory.isEmpty())
        result->setDirectory(initialDirectory);
    const QString initialNameFilter = opts->initiallySelectedNameFilter();
    if (!initialNameFilter.isEmpty())
        result->selectNameFilter(initialNameFilter);
    const QString defaultSuffix = opts->defaultSuffix();
    if (!defaultSuffix.isEmpty())
        result->setDefaultSuffix(defaultSuffix);
    return result;
}

void QWindowsFileDialogHelper::setDirectory_sys(const QString &directory)
{
    if (QWindowsContext::verboseDialogs)
        qDebug("%s %s" , __FUNCTION__, qPrintable(directory));

    if (QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        nfd->setDirectory(directory);
}

QString QWindowsFileDialogHelper::directory_sys() const
{
    if (const QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        return nfd->directory();
    return QString();
}

void QWindowsFileDialogHelper::selectFile_sys(const QString & /* filename */)
{
    // Not implemented.
}

QStringList QWindowsFileDialogHelper::selectedFiles_sys() const
{
    QStringList files;
    if (const QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        nfd->fileResult(&files);
    if (QWindowsContext::verboseDialogs)
        qDebug("%s files='%s'" , __FUNCTION__,
               qPrintable(files.join(QStringLiteral(", "))));
    return files;
}

void QWindowsFileDialogHelper::setFilter_sys()
{
    if (QWindowsContext::verboseDialogs)
        qDebug("%s" , __FUNCTION__);
}

void QWindowsFileDialogHelper::setNameFilters_sys(const QStringList &filters)
{
    if (QWindowsContext::verboseDialogs)
        qDebug("%s" , __FUNCTION__);
    if (QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        nfd->setNameFilters(filters);
}

void QWindowsFileDialogHelper::selectNameFilter_sys(const QString &filter)
{
    if (QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        nfd->selectNameFilter(filter);
}

QString QWindowsFileDialogHelper::selectedNameFilter_sys() const
{
    if (const QWindowsNativeFileDialogBase *nfd = nativeFileDialog())
        return nfd->selectedNameFilter();
    return QString();
}

/*!
    \class QWindowsNativeColorDialog
    \brief Native Windows color dialog.

    Wrapper around Comdlg32's ChooseColor() function.
    Not currently in use as QColorDialog is equivalent.

    \sa QWindowsColorDialogHelper
    \sa #define USE_NATIVE_COLOR_DIALOG

    \ingroup qt-lighthouse-win
*/

typedef QSharedPointer<QColor> SharedPointerColor;

class QWindowsNativeColorDialog : public QWindowsNativeDialogBase
{
    Q_OBJECT
public:
    enum { CustomColorCount = 16 };

    explicit QWindowsNativeColorDialog(const SharedPointerColor &color);

    virtual void setWindowTitle(const QString &) {}
    virtual void exec(HWND owner = 0);
    virtual QPlatformDialogHelper::DialogCode result() const { return m_code; }

public slots:
    virtual void close() {}

private:
    COLORREF m_customColors[CustomColorCount];
    QPlatformDialogHelper::DialogCode m_code;
    SharedPointerColor m_color;
};

QWindowsNativeColorDialog::QWindowsNativeColorDialog(const SharedPointerColor &color) :
    m_code(QPlatformDialogHelper::Rejected), m_color(color)
{
    qFill(m_customColors, m_customColors + 16, COLORREF(0));
}

static inline COLORREF qColorToCOLORREF(const QColor &color)
{ return RGB(color.red(), color.green(), color.blue()); }

static inline QColor COLORREFToQColor(COLORREF cr)
{ return QColor(GetRValue(cr), GetGValue(cr), GetBValue(cr)); }

void QWindowsNativeColorDialog::exec(HWND owner)
{
    typedef BOOL (WINAPI *ChooseColorWType)(LPCHOOSECOLORW);

    CHOOSECOLOR chooseColor;
    if (QWindowsContext::verboseDialogs)
        qDebug() << '>' << __FUNCTION__ << " on " << owner;
    ZeroMemory(&chooseColor, sizeof(chooseColor));
    chooseColor.lStructSize = sizeof(chooseColor);
    chooseColor.hwndOwner = owner;
    chooseColor.lpCustColors = m_customColors;
    QRgb *qCustomColors = QColorDialogOptions::customColors();
    const int customColorCount = qMin(QColorDialogOptions::customColorCount(),
                                      int(CustomColorCount));
    for (int c= 0; c < customColorCount; ++c)
        m_customColors[c] = qColorToCOLORREF(QColor(qCustomColors[c]));
    chooseColor.rgbResult = qColorToCOLORREF(*m_color);
    chooseColor.Flags = CC_FULLOPEN | CC_RGBINIT;
    static ChooseColorWType chooseColorW = 0;
    if (!chooseColorW) {
        QSystemLibrary library(QStringLiteral("Comdlg32"));
        chooseColorW = (ChooseColorWType)library.resolve("ChooseColorW");
    }
    if (chooseColorW) {
        m_code = chooseColorW(&chooseColor) ?
            QPlatformDialogHelper::Accepted : QPlatformDialogHelper::Rejected;
        QWindowsDialogs::eatMouseMove();
    } else {
        m_code = QPlatformDialogHelper::Rejected;
    }
    if (m_code == QPlatformDialogHelper::Accepted) {
        *m_color = COLORREFToQColor(chooseColor.rgbResult);
        for (int c= 0; c < customColorCount; ++c)
            qCustomColors[c] = COLORREFToQColor(m_customColors[c]).rgb();
        emit accepted();
        if (QWindowsContext::verboseDialogs)
            qDebug() << '<' << __FUNCTION__ << m_color;
    } else {
        emit rejected();
    }
}

/*!
    \class QWindowsColorDialogHelper
    \brief Helper for native Windows color dialogs

    Not currently in use as QColorDialog is equivalent.

    \sa #define USE_NATIVE_COLOR_DIALOG
    \sa QWindowsNativeColorDialog

    \ingroup qt-lighthouse-win
*/

class QWindowsColorDialogHelper : public QWindowsDialogHelperBase<QPlatformColorDialogHelper>
{
public:
    QWindowsColorDialogHelper() {}

    virtual bool supportsNonModalDialog()
        { return false; }

    virtual QColor currentColor_sys() const { return *m_currentColor; }
    virtual void setCurrentColor_sys(const QColor &c) { *m_currentColor = c; }

private:
    inline QWindowsNativeColorDialog *nativeFileDialog() const
        { return static_cast<QWindowsNativeColorDialog *>(nativeDialog()); }
    virtual QWindowsNativeDialogBase *createNativeDialog();

    SharedPointerColor m_currentColor;
};

QWindowsNativeDialogBase *QWindowsColorDialogHelper::createNativeDialog()
{
    QWindowsNativeColorDialog *nativeDialog = new QWindowsNativeColorDialog(m_currentColor);
    nativeDialog->setWindowTitle(options()->windowTitle());
    return nativeDialog;
}

namespace QWindowsDialogs {

// QWindowsDialogHelperBase creation functions
bool useHelper(QPlatformTheme::DialogType type)
{
    switch (type) {
    case QPlatformTheme::FileDialog:
        return true;
        break;
    case QPlatformTheme::ColorDialog:
#ifdef USE_NATIVE_COLOR_DIALOG
        return true;
#else
        break;
#endif
    case QPlatformTheme::FontDialog:
        break;
    }
    return false;
}

QPlatformDialogHelper *createHelper(QPlatformTheme::DialogType type)
{
    switch (type) {
    case QPlatformTheme::FileDialog:
        return new QWindowsFileDialogHelper();
    case QPlatformTheme::ColorDialog:
#ifdef USE_NATIVE_COLOR_DIALOG
        return new QWindowsColorDialogHelper();
#else
        break;
#endif
    case QPlatformTheme::FontDialog:
        break;
    }
    return 0;
}

} // namespace QWindowsDialogs
QT_END_NAMESPACE

#include "qwindowsdialoghelpers.moc"