CList.h

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/* Copyright (C) 2015 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_CLIST
#define INCLUDED_CLIST

#include "IGUIScrollBar.h"

/**
 * Create a list of elements, where one can be selected
 * by the user. The control will use a pre-processed
 * text-object for each element, which will be managed
 * by the IGUITextOwner structure.
 *
 * A scroll-bar will appear when needed. This will be
 * achieved with the IGUIScrollBarOwner structure.
 */
class CList : public IGUIScrollBarOwner, public IGUITextOwner
{
    GUI_OBJECT(CList)

public:
    CList();
    virtual ~CList();

    /**
     * @see IGUIObject#ResetStates()
     */
    virtual void ResetStates() { IGUIScrollBarOwner::ResetStates(); }

    /**
     * Adds an item last to the list.
     */
    virtual void AddItem(const CStrW& str, const CStrW& data);

protected:
    /**
     * Sets up text, should be called every time changes has been
     * made that can change the visual.
     */
    virtual void SetupText();

    /**
     * @see IGUIObject#HandleMessage()
     */
    virtual void HandleMessage(SGUIMessage& Message);

    /**
     * Handle events manually to catch keyboard inputting.
     */
    virtual InReaction ManuallyHandleEvent(const SDL_Event_* ev);

    /**
     * Draws the List box
     */
    virtual void Draw();

    /**
     * Easy select elements functions
     */
    virtual void SelectNextElement();
    virtual void SelectPrevElement();
    virtual void SelectFirstElement();
    virtual void SelectLastElement();

    /**
     * Handle the <item> tag.
     */
    virtual bool HandleAdditionalChildren(const XMBElement& child, CXeromyces* pFile);

    // Called every time the auto-scrolling should be checked.
    void UpdateAutoScroll();

    // Extended drawing interface, this is so that classes built on the this one
    //  can use other sprite names.
    virtual void DrawList(const int& selected, const CStr& _sprite, const CStr& _sprite_selected, const CStr& _textcolor);

    // Get the area of the list. This is so that it can easily be changed, like in CDropDown
    //  where the area is not equal to m_CachedActualSize.
    virtual CRect GetListRect() const { return m_CachedActualSize; }

    // Returns whether SetupText() has run since the last message was received
    // (and thus whether list items have possibly changed).
    virtual bool GetModified() const { return m_Modified; }

    /**
     * List of each element's relative y position. Will be
     * one larger than m_Items, because it will end with the
     * bottom of the last element. First element will always
     * be zero, but still stored for easy handling.
     */
    std::vector<float> m_ItemsYPositions;

private:
    // Whether the list's items have been modified since last handling a message.
    bool m_Modified;

    // Used for doubleclick registration
    int m_PrevSelectedItem;

    // Last time a click on an item was issued
    double m_LastItemClickTime;
};

#endif // INCLUDED_CLIST