/*
  This file is part of KDDockWidgets.

  Copyright (C) 2019-2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
  Author: Sérgio Martins <sergio.martins@kdab.com>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef KDDOCKWIDGETS_FRAMEWORKWIDGETFACTORY_H
#define KDDOCKWIDGETS_FRAMEWORKWIDGETFACTORY_H

#include "docks_export.h"
#include "KDDockWidgets.h"
#include "QWidgetAdapter.h"

/**
 * @file
 * @brief A factory class for allowing the user to customize some internal widgets.
 *
 * @author Sérgio Martins \<sergio.martins@kdab.com\>
 */

namespace Layouting {
class Separator;
class Widget;
}

namespace KDDockWidgets {

class MainWindowBase;
class DropIndicatorOverlayInterface;
class FloatingWindow;
class TabWidget;
class TitleBar;
class Frame;
class DropArea;
class TabBar;

/**
 * @brief A factory class for allowing the user to customize some internal widgets.
 * This is optional, and if not provided, a default one will be used, @ref DefaultWidgetFactory.
 *
 * Deriving from @ref DefaultWidgetFactory is recommended, unless you need to override
 * all methods.
 *
 * Sub-classing FrameworkWidgetFactory allows for fine-grained customization and
 * styling of some non-public widgets, such as titlebars, dock widget frame and
 * tab widgets.
 *
 * To set your own factory see Config::setFrameworkWidgetFactory()
 *
 * Will also be useful to provide a QtQuickWidget factory in the future.
 *
 * @sa Config::setFrameworkWidgetFactory()
 */
class DOCKS_EXPORT FrameworkWidgetFactory {
public:
    FrameworkWidgetFactory() = default;

    ///@brief Destructor.Don't delete FrameworkWidgetFactory directly, it's owned
    /// by the framework.
    virtual ~FrameworkWidgetFactory();

    ///@brief Called internally by the framework to create a Frame class
    ////      Override to provide your own Frame sub-class. A frame is the
    ///       widget that holds the titlebar and tab-widget which holds the
    ///       DockWidgets.
    ///@param parent just forward to Frame's constructor
    ///@param options just forward to Frame's constructor
    virtual Frame* createFrame(QWidgetOrQuick *parent = nullptr, FrameOptions = FrameOption_None) const = 0;

    ///@brief Called internally by the framework to create a TitleBar
    ///       Override to provide your own TitleBar sub-class. If overridden then
    ///       you also need to override the overload below.
    ///@param frame Just forward to TitleBar's constructor.
    virtual TitleBar* createTitleBar(Frame *frame) const = 0;

    ///@brief Called internally by the framework to create a TitleBar
    ///       Override to provide your own TitleBar sub-class. If overridden then
    ///       you also need to override the overload above.
    ///@param floatingWindow Just forward to TitleBar's constructor.
    virtual TitleBar* createTitleBar(FloatingWindow *floatingWindow) const = 0;

    ///@brief Called internally by the framework to create a TabBar
    ///       Override to provide your own TabBar sub-class.
    ///@param parent Just forward to TabBar's's constructor.
    virtual TabBar* createTabBar(TabWidget *parent = nullptr) const = 0;

    ///@brief Called internally by the framework to create a TabWidget
    ///       Override to provide your own TabWidget sub-class.
    ///@param parent Just forward to TabWidget's constructor.
    virtual TabWidget* createTabWidget(Frame *parent) const = 0;

    ///@brief Called internally by the framework to create a Separator
    ///       Override to provide your own Separator sub-class. The Separator allows
    ///       the user to resize nested dock widgets.
    ///@param parent Just forward to Separator's constructor.
    virtual Layouting::Separator* createSeparator(Layouting::Widget *parent = nullptr) const = 0;

    ///@brief Called internally by the framework to create a FloatingWindow
    ///       Override to provide your own FloatingWindow sub-class. If overridden then
    ///       you also need to override the overloads below.
    ///@param parent Just forward to FloatingWindow's constructor.
    virtual FloatingWindow *createFloatingWindow(MainWindowBase *parent = nullptr) const = 0;

    ///@brief Called internally by the framework to create a FloatingWindow
    ///       Override to provide your own FloatingWindow sub-class. If overridden then
    ///       you also need to override the overloads above.
    ///@param frame Just forward to FloatingWindow's constructor.
    ///@param parent Just forward to FloatingWindow's constructor.
    virtual FloatingWindow *createFloatingWindow(Frame *frame, MainWindowBase *parent = nullptr) const = 0;

    ///@brief Called internally by the framework to create a DropIndicatorOverlayInterface
    ///       Override to provide your own DropIndicatorOverlayInterface sub-class.
    ///@param dropArea Just forward to DropIndicatorOverlayInterface's constructor.
    virtual DropIndicatorOverlayInterface *createDropIndicatorOverlay(DropArea *dropArea) const = 0;
private:
    Q_DISABLE_COPY(FrameworkWidgetFactory)
};

/**
 * @brief The FrameworkWidgetFactory that's used if none is specified.
 */
class DOCKS_EXPORT DefaultWidgetFactory : public FrameworkWidgetFactory
{
public:
    DefaultWidgetFactory() = default;
    Frame *createFrame(QWidgetOrQuick *parent, FrameOptions) const override;
    TitleBar *createTitleBar(Frame *) const override;
    TitleBar *createTitleBar(FloatingWindow *) const override;
    TabBar *createTabBar(TabWidget *parent) const override;
    TabWidget *createTabWidget(Frame *parent) const override;
    Layouting::Separator *createSeparator(Layouting::Widget *parent = nullptr) const override;
    FloatingWindow *createFloatingWindow(MainWindowBase *parent = nullptr) const override;
    FloatingWindow *createFloatingWindow(Frame *frame, MainWindowBase *parent = nullptr) const override;
    DropIndicatorOverlayInterface *createDropIndicatorOverlay(DropArea*) const override;
private:
    Q_DISABLE_COPY(DefaultWidgetFactory)
};

}

#endif