focusdata.h

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/*
  libwt - Vassilis Virvilis Toolkit - a widget library
  Copyright (C) 2006 Vassilis Virvilis <vasvir2@fastmail.fm>
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  This library 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
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  Boston, MA  02111-1307, SA.
*/

#ifndef WT_FOCUSDATA_H
#define WT_FOCUSDATA_H

#include <list>

namespace Wt {

class Widget;
typedef std::list<Widget *> WidgetList;

class FocusData : public WidgetList {
public:
    Widget *focusWidget() const {
        return (current_it_ != end()) ? *current_it_ : 0;
    }

    Widget *home() {
        it_ = current_it_;
        return focusWidget();
    }

    Widget *next() {
        if (it_ == end())
            return 0;
        ++it_;
        if (it_ == end())
            it_ = begin();
        return *it_;
    }

    Widget *prev() {
        if (it_ == end())
            return 0;
        if (it_ == begin())
            it_ = end();
        else {
            --it_;
        }
        return *it_;
    }

    Widget *first() const {
        if (!size())
            return 0;
        return front();
    }

    Widget *last() const {
        if (!size())
            return 0;
        return back();
    }

    int count() const {
        return size();
    }

protected:
    friend class Widget;
    FocusData() :
            current_it_(end()),
    it_(end()) {}

    Widget *setFocus(const Widget *w) {
        it_ = find(begin(), end(), w);
        current_it_ = it_;
        return focusWidget();
    }

    /// stop being clever and loose the damn focus
    void looseFocus() {
        current_it_ = end();
        it_ = begin();
    }

private:
    WidgetList::iterator current_it_, it_;
};

}
#endif // WT_FOCUSDATA_H

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This document is licensed under the terms of the GNU Free Documentation License and may be freely distributed under the conditions given by this license.