combobox.cpp

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/*
 * ===========================================================================
 * PRODUCTION $Log: combobox.cpp,v $
 * PRODUCTION Revision 1000.3  2004/06/01 21:08:58  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.16
 * PRODUCTION
 * ===========================================================================
 */

/*  $Id: combobox.cpp,v 1000.3 2004/06/01 21:08:58 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Author: Philip Johnson
 *
 * File Description: combobox.cpp -- dropdown combobox widget for FLTK
 *
 */

#include <ncbi_pch.hpp>
#include <corelib/ncbistl.hpp>
#include <gui/widgets/fl/combobox.hpp>

#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Input.H>


BEGIN_NCBI_SCOPE


//-----------------------------------------------------------------------------
// PRE : undo information stored in member variables
// POST: the previous value, position & mark have been restored
void CComboBox::CInput::Undo(void)
{
    value(m_Value.c_str());
    position(m_Position, m_Mark);
}

//-----------------------------------------------------------------------------
// PRE : input event
// POST: if ctrl pressed, parent window is checked for shortcuts; current
// input information (value, mark, position) is stored for undo purposes
int CComboBox::CInput::handle(int e)
{
    if (e == FL_KEYBOARD) {
        if ((Fl::event_state() & FL_CTRL)  &&
            window()->handle(FL_SHORTCUT)) { //check for shortcuts
            return 1;
        }

        m_Value = value();
        m_Mark = mark();
        m_Position = position();
    }

    return Fl_Input::handle(e);
}


//-----------------------------------------------------------------------------
// PRE : browser event
// POST: standard browser event handler; if value() is 0 & down arrow
// pressed, value changed to 1 (bug in std handler changes the value to 2)
int CComboBox::CBrowser::handle(int e)
{
    if (e == FL_KEYBOARD  &&  Fl::event_key() == FL_Down  &&  value() == 0) {
        value(1);
        do_callback();
        return 1;
    }
    return Fl_Hold_Browser::handle(e);
}

//-----------------------------------------------------------------------------
// PRE : a widget
// POST: whether the current event *ROOT* is found within the box specified
// by the widget
bool EventRootInside(Fl_Widget *w) {
    if (!w) {
        return false;
    }
    return !(Fl::event_x_root() < w->x()  ||
             Fl::event_x_root() >= w->x() + w->w()  ||
             Fl::event_y_root() < w->y()  ||
             Fl::event_y_root() >= w->y() + w->h());

}

//-----------------------------------------------------------------------------
// PRE : standard fltk boundaries
// POST: popupwin created
CComboBox::CPopupWin::CPopupWin(int x, int y, int w, int h)
    : Fl_Menu_Window(x,y,w,h), m_MouseOver(NULL)
{
    clear_border();
    size_range(1,1);
}



//-----------------------------------------------------------------------------
// PRE : a grabbed event 
// POST: event passed to leaf widgets as appropriate
int CComboBox::CPopupWin::handle(int event)
{
    switch (event) {
    case FL_SHOW:
        m_MouseOver = NULL;
        break;

    case FL_MOVE:
        {   
            // We moved outside the top-level window; close it!
            Fl_Window *top = Fl::first_window();
            if (top == this) {
                top = Fl::next_window(top);
            }
            if (!EventRootInside(top)  &&
                !EventRootInside(this)) {
                do_callback();
                return 1;
            }
        }
        {   
            // Identify & process leave events
            int childI;
            for (childI = children() - 1;
                 childI >= 0  &&  !Fl::event_inside(child(childI));
                 --childI);
            
            if (childI < 0) {
                if (m_MouseOver) {
                    m_MouseOver->handle(FL_LEAVE);
                    m_MouseOver = NULL;
                }
            } else if (child(childI) != m_MouseOver) {
                if (m_MouseOver) {
                    m_MouseOver->handle(FL_LEAVE);
                }
                m_MouseOver = child(childI);
            }
        }
        break;

    case FL_PUSH:
        if (Fl::event_x() < 0  ||  Fl::event_x() >= w()  ||
            Fl::event_y() < 0  ||  Fl::event_y() >= h()) {
            do_callback();
            return 1;
        }
        break;

    case FL_KEYBOARD:
    case FL_SHORTCUT:
        switch(Fl::event_key()) {
        case FL_Tab:
        case FL_Enter:
        case FL_Escape:
        case FL_Control_L:
        case FL_Alt_L:
        case FL_Alt_R:
            do_callback();
            return 0;

        default: break;
        }

        for (int childI = children()-1;  childI >= 0;  --childI) {
            if (child(childI)->handle(event) != 0) {
                return 1;
            }
        }
        break;

    default: break;
    }

    return Fl_Menu_Window::handle(event);
}


//-----------------------------------------------------------------------------
// PRE :
// POST:
CComboBox::CComboBox(int x, int y, int w, int h, const char* label)
    : Fl_Group(x,y,w,h+1, label), m_InKeypressed(false), m_EntryMap(new CMap)
{
    when(FL_WHEN_CHANGED);
        
    int dx = Fl::box_dx(FL_DOWN_FRAME);
    int dy = Fl::box_dy(FL_DOWN_FRAME);
    int buttonD = h-2*dy;

    {
        m_Box = new Fl_Box(FL_DOWN_FRAME, x,y,w,h, NULL);

        m_Input = new CInput(x+dx, y+dy, w-2*dx-buttonD-1, buttonD);
        m_Input->box(FL_FLAT_BOX);
        m_Input->when(FL_WHEN_CHANGED);
        m_Input->callback((Fl_Callback*) s_InputCB, this);
        
        m_Button = new Fl_Button(x+(w-dx-buttonD), y+dy, buttonD,buttonD);
        m_Button->clear_visible_focus();
        m_Button->label("@-12>");
        m_Button->callback((Fl_Callback*) s_ButtonCB, this);
    }

    // Hidden window, mimics group
    Fl_Group::current(0);
    m_PopupWin = new CPopupWin(x, y, w, h*4);
    {
        m_Browser = new CBrowser(0, h, w, h*3);
        m_Browser->box(FL_BORDER_BOX);
        m_Browser->callback((Fl_Callback*) s_BrowserCB, this);
    }
    begin();

    m_PopupWin->resizable(m_PopupWin);
    m_PopupWin->callback((Fl_Callback*) s_CloseCB, this);
    m_PopupWin->end();
    m_PopupWin->hide();

    m_ResizeBox = new Fl_Box(m_Input->x(), m_Input->y(), m_Input->w(), 1);
    m_ResizeBox->hide();
    resizable(m_ResizeBox);
    end();
}


//-----------------------------------------------------------------------------
// PRE : event for whole combobox
// POST: open browser on down arrow; close browser on escape
int CComboBox::handle(int event)
{
    switch (event) {
    case FL_KEYBOARD:
        switch (Fl::event_key()) {
        case FL_Down:
        case FL_Up:
            {
                int curr = value_index();
                if (curr == -1  ||
                    !((m_Input->mark() == 0 &&
                       m_Input->position() == m_Input->size()) ||
                      (m_Input->position() == 0 &&
                       m_Input->mark() == m_Input->size()))) {
                    x_OpenBrowser();
                } else {
                    int next = (Fl::event_key() == FL_Down) ? curr+1 : curr-1;
                    if (next >= 0  &&  next < (int) m_Entries.size()) {
                        value(m_Entries[next].c_str());
                    }
                }
                return 1;
            }
        case FL_Enter:
            x_MaybeCallback();
        default:
            break;
        }
        break;

    case FL_UNFOCUS:
        x_MaybeCallback();
        break;

    default:
        break;
    }

    return Fl_Group::handle(event);
};


//-----------------------------------------------------------------------------
// PRE : new value for combobox
// POST: input box set to that value; browser scrolled to it as, if possible
void CComboBox::value(const char* s)
{
    m_Input->value(s);
    int idx = value_index();
    if (idx != -1) {
        m_Browser->value(idx+1);
    }
}


//-----------------------------------------------------------------------------