/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at https://www.qt.io/contact-us.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtWidgets/qmainwindow.h>
#include <QtCore/qvector.h>
#include <QtWidgets/qmdiarea.h>

QT_BEGIN_NAMESPACE

class QDesignerActions;
class QDesignerWorkbench;
class QDesignerToolWindow;
class QDesignerFormWindow;
class QDesignerSettings;

class QtToolBarManager;
class QToolBar;
class QMdiArea;
class QMenu;
class QByteArray;
class QMimeData;

/* A main window that has a configureable policy on handling close events. If
 * enabled, it can forward the close event to external handlers.
 * Base class for windows that can switch roles between tool windows
 * and main windows. */

class MainWindowBase: public QMainWindow
{
    Q_DISABLE_COPY_MOVE(MainWindowBase)
    Q_OBJECT
protected:
    explicit MainWindowBase(QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::Window);

public:
    enum CloseEventPolicy {
        /* Always accept close events */
        AcceptCloseEvents,
        /* Emit a signal with the event, have it handled elsewhere */
        EmitCloseEventSignal };

    CloseEventPolicy closeEventPolicy() const { return m_policy; }
    void setCloseEventPolicy(CloseEventPolicy pol) { m_policy = pol; }

    static QVector<QToolBar *> createToolBars(const QDesignerActions *actions, bool singleToolBar);
    static QString mainWindowTitle();

    // Use the minor Qt version as settings versions to avoid conflicts
    static int settingsVersion();

signals:
    void closeEventReceived(QCloseEvent *e);

protected:
    void closeEvent(QCloseEvent *e) override;
private:
    CloseEventPolicy m_policy = AcceptCloseEvents;
};

/* An MdiArea that listens for desktop file manager file drop events and emits
 * a signal to open a dropped file. */
class DockedMdiArea : public QMdiArea
{
    Q_DISABLE_COPY_MOVE(DockedMdiArea)
    Q_OBJECT
public:
    explicit DockedMdiArea(const QString &extension, QWidget *parent = nullptr);

signals:
    void fileDropped(const QString &);

protected:
    bool event (QEvent *event);

private:
    QStringList uiFiles(const QMimeData *d) const;

    const QString m_extension;
};

// Convenience class that manages a QtToolBarManager and an action to trigger
// it on a mainwindow.
class ToolBarManager : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY_MOVE(ToolBarManager)
public:
    explicit ToolBarManager(QMainWindow *configureableMainWindow,
                            QWidget *parent,
                            QMenu *toolBarMenu,
                            const QDesignerActions *actions,
                            const QVector<QToolBar *> &toolbars,
                            const QVector<QDesignerToolWindow *> &toolWindows);

    QByteArray saveState(int version = 0) const;
    bool restoreState(const QByteArray &state, int version = 0);

private slots:
    void configureToolBars();
    void updateToolBarMenu();

private:
    QMainWindow *m_configureableMainWindow;
    QWidget *m_parent;
    QMenu *m_toolBarMenu;
    QtToolBarManager *m_manager;
    QAction *m_configureAction;
    QVector<QToolBar *> m_toolbars;
};

/* Main window to be used for docked mode */
class DockedMainWindow : public MainWindowBase {
    Q_OBJECT
    Q_DISABLE_COPY_MOVE(DockedMainWindow)
public:
    typedef QVector<QDesignerToolWindow *> DesignerToolWindowList;
    typedef QVector<QDockWidget *> DockWidgetList;

    explicit DockedMainWindow(QDesignerWorkbench *wb,
                              QMenu *toolBarMenu,
                              const DesignerToolWindowList &toolWindows);

    // Create a MDI subwindow for the form.
    QMdiSubWindow *createMdiSubWindow(QWidget *fw, Qt::WindowFlags f, const QKeySequence &designerCloseActionShortCut);

    QMdiArea *mdiArea() const;

    DockWidgetList addToolWindows(const DesignerToolWindowList &toolWindows);

    void restoreSettings(const QDesignerSettings &s, const DockWidgetList &dws, const QRect &desktopArea);
    void saveSettings(QDesignerSettings &) const;

signals:
    void fileDropped(const QString &);
    void formWindowActivated(QDesignerFormWindow *);

private slots:
    void slotSubWindowActivated(QMdiSubWindow*);

private:
    ToolBarManager *m_toolBarManager;
};

QT_END_NAMESPACE

#endif // MAINWINDOW_H