qwidgetplatform_p.h

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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QWIDGETPLATFORM_P_H
#define QWIDGETPLATFORM_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtCore/qdebug.h>
#include <QtCore/qcoreapplication.h>
#include <QtGui/qpa/qplatformtheme.h>
#include <QtGui/qpa/qplatformdialoghelper.h>
#include <QtGui/qpa/qplatformsystemtrayicon.h>
#include <QtGui/qpa/qplatformmenu.h>
 
#ifdef QT_WIDGETS_LIB
#include <QtWidgets/qtwidgetsglobal.h>
#if QT_CONFIG(colordialog)
#include "qwidgetplatformcolordialog_p.h"
#endif
#if QT_CONFIG(filedialog)
#include "qwidgetplatformfiledialog_p.h"
#endif
#if QT_CONFIG(fontdialog)
#include "qwidgetplatformfontdialog_p.h"
#endif
#if QT_CONFIG(messagebox)
#include "qwidgetplatformmessagedialog_p.h"
#endif
#if QT_CONFIG(menu)
#include "qwidgetplatformmenu_p.h"
#include "qwidgetplatformmenuitem_p.h"
#endif
#ifndef QT_NO_SYSTEMTRAYICON
#include "qwidgetplatformsystemtrayicon_p.h"
#endif
#endif
 
QT_BEGIN_NAMESPACE
 
#ifndef QT_WIDGETS_LIB
typedef QPlatformMenu QWidgetPlatformMenu;
typedef QPlatformMenuItem QWidgetPlatformMenuItem;
typedef QPlatformColorDialogHelper QWidgetPlatformColorDialog;
typedef QPlatformFileDialogHelper QWidgetPlatformFileDialog;
typedef QPlatformFontDialogHelper QWidgetPlatformFontDialog;
typedef QPlatformMessageDialogHelper QWidgetPlatformMessageDialog;
typedef QPlatformSystemTrayIcon QWidgetPlatformSystemTrayIcon;
#endif
 
namespace QWidgetPlatform
{
    static inline bool isAvailable(const char *type)
    {
        if (!qApp->inherits("QApplication")) {
            qCritical("\nERROR: No native %s implementation available."
                      "\nQt Labs Platform requires Qt Widgets on this setup."
                      "\nAdd 'QT += widgets' to .pro and create QApplication in main().\n", type);
            return false;
        }
        return true;
    }
 
    template<typename T>
    static inline T *createWidget(const char *name, QObject *parent)
    {
        static bool available = isAvailable(name);
#ifdef QT_WIDGETS_LIB
        if (available)
            return new T(parent);
#else
        Q_UNUSED(parent);
        Q_UNUSED(available);
#endif
        return nullptr;
    }
 
    static inline QPlatformMenu *createMenu(QObject *parent = nullptr) {
#if defined(QT_WIDGETS_LIB) && QT_CONFIG(menu)
        return createWidget<QWidgetPlatformMenu>("Menu", parent);
#else
        Q_UNUSED(parent);
        return nullptr;
#endif
    }
    static inline QPlatformMenuItem *createMenuItem(QObject *parent = nullptr) {
#if defined(QT_WIDGETS_LIB) && QT_CONFIG(menu)
        return createWidget<QWidgetPlatformMenuItem>("MenuItem", parent);
#else
        Q_UNUSED(parent);
        return nullptr;
#endif
    }
    static inline QPlatformSystemTrayIcon *createSystemTrayIcon(QObject *parent = nullptr) {
#ifndef QT_NO_SYSTEMTRAYICON
        return createWidget<QWidgetPlatformSystemTrayIcon>("SystemTrayIcon", parent);
#else
        Q_UNUSED(parent);
        return nullptr;
#endif
    }
    static inline QPlatformDialogHelper *createDialog(QPlatformTheme::DialogType type, QObject *parent = nullptr)
    {
#if !defined(QT_WIDGETS_LIB) || !(QT_CONFIG(colordialog) || QT_CONFIG(filedialog) || QT_CONFIG(fontdialog) || QT_CONFIG(messagebox))
        Q_UNUSED(type);
        Q_UNUSED(parent);
#else
        switch (type) {
#if QT_CONFIG(colordialog)
        case QPlatformTheme::ColorDialog: return createWidget<QWidgetPlatformColorDialog>("ColorDialog", parent);
#endif
#if QT_CONFIG(filedialog)
        case QPlatformTheme::FileDialog: return createWidget<QWidgetPlatformFileDialog>("FileDialog", parent);
#endif
#if QT_CONFIG(fontdialog)
        case QPlatformTheme::FontDialog: return createWidget<QWidgetPlatformFontDialog>("FontDialog", parent);
#endif
#if QT_CONFIG(messagebox)
        case QPlatformTheme::MessageDialog: return createWidget<QWidgetPlatformMessageDialog>("MessageDialog", parent);
#endif
        default: break;
        }
#endif
        return nullptr;
    }
}
 
QT_END_NAMESPACE
 
#endif // QWIDGETPLATFORM_P_H