/****************************************************************************
**
** Copyright (C) 2013 Samuel Gaist <samuel.gaist@edeltech.ch>
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
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** General Public License version 3 as published by the Free Software
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** ensure the GNU Lesser General Public License version 3 requirements
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****************************************************************************/

#include "qwindowsguieventdispatcher_p.h"

#include <qpa/qwindowsysteminterface.h>

#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>

QT_BEGIN_NAMESPACE

/*!
    \class QWindowsGuiEventDispatcher
    \brief Event dispatcher for Windows

    Maintains a global stack storing the current event dispatcher and
    its processing flags for access from the Windows procedure
    qWindowsWndProc. Handling the QPA gui events should be done
    from within the qWindowsWndProc to ensure correct processing of messages.

    \internal
*/

QWindowsGuiEventDispatcher::QWindowsGuiEventDispatcher(QObject *parent) :
    QEventDispatcherWin32(parent)
{
    setObjectName(QStringLiteral("QWindowsGuiEventDispatcher"));
    createInternalHwnd(); // QTBUG-40881: Do not delay registering timers, etc. for QtMfc.
}

bool QWindowsGuiEventDispatcher::processEvents(QEventLoop::ProcessEventsFlags flags)
{
    const QEventLoop::ProcessEventsFlags oldFlags = m_flags;
    m_flags = flags;
    const bool rc = QEventDispatcherWin32::processEvents(flags);
    m_flags = oldFlags;
    return rc;
}

void QWindowsGuiEventDispatcher::sendPostedEvents()
{
    QEventDispatcherWin32::sendPostedEvents();
    QWindowSystemInterface::sendWindowSystemEvents(m_flags);
}

// Helpers for printing debug output for WM_* messages.
struct MessageDebugEntry
{
    UINT message;
    const char *description;
    bool interesting;
};

static const MessageDebugEntry
messageDebugEntries[] = {
    {WM_CREATE, "WM_CREATE", true},
    {WM_PAINT, "WM_PAINT", true},
    {WM_CLOSE, "WM_CLOSE", true},
    {WM_DESTROY, "WM_DESTROY", true},
    {WM_MOVE, "WM_MOVE", true},
    {WM_SIZE, "WM_SIZE", true},
    {WM_GETICON, "WM_GETICON", false},
    {WM_KEYDOWN, "WM_KEYDOWN", true},
    {WM_SYSKEYDOWN, "WM_SYSKEYDOWN", true},
    {WM_SYSCOMMAND, "WM_SYSCOMMAND", true},
    {WM_KEYUP, "WM_KEYUP", true},
    {WM_SYSKEYUP, "WM_SYSKEYUP", true},
#if defined(WM_APPCOMMAND)
    {WM_APPCOMMAND, "WM_APPCOMMAND", true},
#endif
    {WM_IME_CHAR, "WM_IMECHAR", true},
    {WM_IME_KEYDOWN, "WM_IMECHAR", true},
    {WM_CANCELMODE,  "WM_CANCELMODE", true},
    {WM_CHAR, "WM_CHAR", true},
    {WM_DEADCHAR, "WM_DEADCHAR", true},
    {WM_ACTIVATE, "WM_ACTIVATE", true},
    {WM_SETFOCUS, "WM_SETFOCUS", true},
    {WM_KILLFOCUS, "WM_KILLFOCUS", true},
    {WM_ENABLE, "WM_ENABLE", true},
    {WM_SHOWWINDOW, "WM_SHOWWINDOW", true},
    {WM_WINDOWPOSCHANGED, "WM_WINDOWPOSCHANGED", true},
    {WM_SETCURSOR, "WM_SETCURSOR", false},
    {WM_GETFONT, "WM_GETFONT", true},
    {WM_LBUTTONDOWN, "WM_LBUTTONDOWN", true},
    {WM_LBUTTONUP, "WM_LBUTTONUP", true},
    {WM_LBUTTONDBLCLK, "WM_LBUTTONDBLCLK", true},
    {WM_RBUTTONDOWN, "WM_RBUTTONDOWN", true},
    {WM_RBUTTONUP, "WM_RBUTTONUP", true},
    {WM_RBUTTONDBLCLK, "WM_RBUTTONDBLCLK", true},
    {WM_MBUTTONDOWN, "WM_MBUTTONDOWN", true},
    {WM_MBUTTONUP, "WM_MBUTTONUP", true},
    {WM_MBUTTONDBLCLK, "WM_MBUTTONDBLCLK", true},
    {WM_MOUSEWHEEL, "WM_MOUSEWHEEL", true},
    {WM_XBUTTONDOWN, "WM_XBUTTONDOWN", true},
    {WM_XBUTTONUP, "WM_XBUTTONUP", true},
    {WM_XBUTTONDBLCLK, "WM_XBUTTONDBLCLK", true},
    {WM_MOUSEHWHEEL, "WM_MOUSEHWHEEL", true},
    {WM_GETOBJECT, "WM_GETOBJECT", true},
    {WM_IME_SETCONTEXT, "WM_IME_SETCONTEXT", true},
    {WM_INPUTLANGCHANGE, "WM_INPUTLANGCHANGE", true},
    {WM_IME_NOTIFY, "WM_IME_NOTIFY", true},
#if defined(WM_DWMNCRENDERINGCHANGED)
    {WM_DWMNCRENDERINGCHANGED, "WM_DWMNCRENDERINGCHANGED", true},
#endif
    {WM_IME_SETCONTEXT, "WM_IME_SETCONTEXT", true},
    {WM_IME_NOTIFY, "WM_IME_NOTIFY", true},
    {WM_RENDERFORMAT, "WM_RENDERFORMAT", true},
    {WM_RENDERALLFORMATS, "WM_RENDERALLFORMATS", true},
    {WM_DESTROYCLIPBOARD, "WM_DESTROYCLIPBOARD", true},
    {WM_CAPTURECHANGED, "WM_CAPTURECHANGED", true},
    {WM_IME_STARTCOMPOSITION, "WM_IME_STARTCOMPOSITION", true},
    {WM_IME_COMPOSITION, "WM_IME_COMPOSITION", true},
    {WM_IME_ENDCOMPOSITION, "WM_IME_ENDCOMPOSITION", true},
    {WM_IME_NOTIFY, "WM_IME_NOTIFY", true},
    {WM_IME_REQUEST, "WM_IME_REQUEST", true},
#if !defined(QT_NO_SESSIONMANAGER)
    {WM_QUERYENDSESSION, "WM_QUERYENDSESSION", true},
    {WM_ENDSESSION, "WM_ENDSESSION", true},
#endif
    {WM_MOUSEACTIVATE,"WM_MOUSEACTIVATE", true},
    {WM_CHILDACTIVATE, "WM_CHILDACTIVATE", true},
    {WM_PARENTNOTIFY, "WM_PARENTNOTIFY", true},
    {WM_ENTERIDLE, "WM_ENTERIDLE", false},
    {WM_GETMINMAXINFO, "WM_GETMINMAXINFO", true},
    {WM_WINDOWPOSCHANGING, "WM_WINDOWPOSCHANGING", true},
    {WM_NCCREATE, "WM_NCCREATE", true},
    {WM_NCDESTROY, "WM_NCDESTROY", true},
    {WM_NCCALCSIZE, "WM_NCCALCSIZE", true},
    {WM_NCACTIVATE, "WM_NCACTIVATE", true},
    {WM_NCMOUSEMOVE, "WM_NCMOUSEMOVE", true},
    {WM_NCMOUSELEAVE, "WM_NCMOUSELEAVE", true},
    {WM_NCLBUTTONDOWN, "WM_NCLBUTTONDOWN", true},
    {WM_NCLBUTTONUP, "WM_NCLBUTTONUP", true},
    {WM_ACTIVATEAPP, "WM_ACTIVATEAPP", true},
    {WM_NCPAINT, "WM_NCPAINT", true},
    {WM_ERASEBKGND, "WM_ERASEBKGND", true},
    {WM_MOUSEMOVE, "WM_MOUSEMOVE", true},
    {WM_MOUSELEAVE, "WM_MOUSELEAVE", true},
    {WM_NCHITTEST, "WM_NCHITTEST", false},
#ifdef WM_TOUCH
    {WM_TOUCH, "WM_TOUCH", true},
#endif
    {WM_CHANGECBCHAIN, "WM_CHANGECBCHAIN", true},
    {WM_DISPLAYCHANGE, "WM_DISPLAYCHANGE", true},
    {WM_DRAWCLIPBOARD, "WM_DRAWCLIPBOARD", true},
    {WM_THEMECHANGED, "WM_THEMECHANGED", true},
    {0x90, "WM_UAHDESTROYWINDOW", true},
    {0x272, "WM_UNREGISTER_WINDOW_SERVICES", true},
#ifdef WM_POINTERUPDATE
    {WM_POINTERDEVICECHANGE, "WM_POINTERDEVICECHANGE", true},
    {WM_POINTERDEVICEINRANGE, "WM_POINTERDEVICEINRANGE", true},
    {WM_POINTERDEVICEOUTOFRANGE, "WM_POINTERDEVICEOUTOFRANGE", true},
    {WM_NCPOINTERUPDATE, "WM_NCPOINTERUPDATE", true},
    {WM_NCPOINTERDOWN, "WM_NCPOINTERDOWN", true},
    {WM_NCPOINTERUP, "WM_NCPOINTERUP", true},
    {WM_POINTERUPDATE, "WM_POINTERUPDATE", true},
    {WM_POINTERDOWN, "WM_POINTERDOWN", true},
    {WM_POINTERUP, "WM_POINTERUP", true},
    {WM_POINTERENTER, "WM_POINTERENTER", true},
    {WM_POINTERLEAVE, "WM_POINTERLEAVE", true},
    {WM_POINTERACTIVATE, "WM_POINTERACTIVATE", true},
    {WM_POINTERCAPTURECHANGED, "WM_POINTERCAPTURECHANGED", true},
    {WM_TOUCHHITTESTING, "WM_TOUCHHITTESTING", true},
    {WM_POINTERWHEEL, "WM_POINTERWHEEL", true},
    {WM_POINTERHWHEEL, "WM_POINTERHWHEEL", true},
#endif // WM_POINTERUPDATE
#ifdef DM_POINTERHITTEST
    {DM_POINTERHITTEST, "DM_POINTERHITTEST", true},
#endif // DM_POINTERHITTEST
#ifdef WM_POINTERROUTEDTO
    {WM_POINTERROUTEDTO, "WM_POINTERROUTEDTO", true},
    {WM_POINTERROUTEDAWAY, "WM_POINTERROUTEDAWAY", true},
    {WM_POINTERROUTEDRELEASED, "WM_POINTERROUTEDRELEASED", true},
#endif // WM_POINTERROUTEDTO
};

static inline const MessageDebugEntry *messageDebugEntry(UINT msg)
{
    for (size_t i = 0; i < sizeof(messageDebugEntries)/sizeof(MessageDebugEntry); i++)
        if (messageDebugEntries[i].message == msg)
            return messageDebugEntries + i;
    return 0;
}

const char *QWindowsGuiEventDispatcher::windowsMessageName(UINT msg)
{
    if (const MessageDebugEntry *e = messageDebugEntry(msg))
        return e->description;
    return "Unknown";
}

QT_END_NAMESPACE