WidgetInit.h

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#pragma once
class QWidget;
namespace NDEVR
{
    class DockItem;
    class QCustomDockWidget;
    /**--------------------------------------------------------------------------------------------------
    \brief Provides a way to lazily initialize widgets when needed but still pass them to container
        dialogs. Useful for adding things to Settings dialogs or other large structures where
        they may never be initialized.
    **/
    class WidgetInit
    {
    public:
        WidgetInit(std::function<QWidget*()> init)
            : m_create_widget(init)
        {}
        WidgetInit(QWidget* widget)
            : m_widget(widget)
        {}
        virtual QWidget* getWidget()
        {
            if (m_widget == nullptr)
                m_widget = m_create_widget();
            return m_widget;
        }
    protected:
        const std::function<QWidget*()> m_create_widget;
        QWidget* m_widget = nullptr;
    };
    /**--------------------------------------------------------------------------------------------------
    \brief Provides a way to optianally lazily initialize widgets when needed but still pass them 
        to container docks. Useful for adding things to Settings dialogs or other large structures where
        they may never be initialized.
    **/
    class DockInit
    {
    public:
        DockInit(std::function<QCustomDockWidget*()> init)
            : m_create_dock(init)
        {}
        DockInit(QCustomDockWidget* init)
            : m_dock_item(init)
        {}
        bool isInit() const
        {
            return m_dock_item != nullptr;
        }
        virtual QCustomDockWidget* getDock()
        {
            if (m_dock_item == nullptr)
                m_dock_item = m_create_dock();
            return m_dock_item;
        }
    protected:
        const std::function<QCustomDockWidget*()> m_create_dock;
        QCustomDockWidget* m_dock_item = nullptr;
    };
}