layout.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        layout.cpp
// Purpose:     Constraint layout system classes
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id: layout.cpp,v 1.30 2005/03/12 20:57:14 RD Exp $
// Copyright:   (c) Julian Smart
// Licence:       wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// =============================================================================
// declarations
// =============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "layout.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#ifndef WX_PRECOMP
  #include "wx/defs.h"
#endif

#if wxUSE_CONSTRAINTS

#ifndef WX_PRECOMP
  #include "wx/window.h"
  #include "wx/utils.h"
  #include "wx/dialog.h"
  #include "wx/msgdlg.h"
  #include "wx/intl.h"
#endif

#include "wx/layout.h"

    IMPLEMENT_DYNAMIC_CLASS(wxIndividualLayoutConstraint, wxObject)
    IMPLEMENT_DYNAMIC_CLASS(wxLayoutConstraints, wxObject)



inline void wxGetAsIs(wxWindowBase* win, int* w, int* h)
{
#if 1
    // The old way.  Works for me.
    win->GetSize(w, h);
#endif
    
#if 0
    // Vadim's change.  Breaks wxPython's LayoutAnchors
    win->GetBestSize(w, h);
#endif

#if 0
    // Proposed compromise.  Doesn't work.
    int sw, sh, bw, bh;
    win->GetSize(&sw, &sh);
    win->GetBestSize(&bw, &bh);
    if (w)
        *w = wxMax(sw, bw);
    if (h)
        *h = wxMax(sh, bh);
#endif
}


wxIndividualLayoutConstraint::wxIndividualLayoutConstraint()
{
    myEdge = wxTop;
    relationship = wxUnconstrained;
    margin = 0;
    value = 0;
    percent = 0;
    otherEdge = wxTop;
    done = false;
    otherWin = (wxWindowBase *) NULL;
}

void wxIndividualLayoutConstraint::Set(wxRelationship rel, wxWindowBase *otherW, wxEdge otherE, int val, int marg)
{
    if (rel == wxSameAs)
    {
        // If Set is called by the user with wxSameAs then call SameAs to do
        // it since it will actually use wxPercent instead.
        SameAs(otherW, otherE, marg);
        return;
    }

    relationship = rel;
    otherWin = otherW;
    otherEdge = otherE;

    if ( rel == wxPercentOf )
    {
        percent = val;
    }
    else
    {
        value = val;
    }

    margin = marg;
}

void wxIndividualLayoutConstraint::LeftOf(wxWindowBase *sibling, int marg)
{
    Set(wxLeftOf, sibling, wxLeft, 0, marg);
}

void wxIndividualLayoutConstraint::RightOf(wxWindowBase *sibling, int marg)
{
    Set(wxRightOf, sibling, wxRight, 0, marg);
}

void wxIndividualLayoutConstraint::Above(wxWindowBase *sibling, int marg)
{
    Set(wxAbove, sibling, wxTop, 0, marg);
}

void wxIndividualLayoutConstraint::Below(wxWindowBase *sibling, int marg)
{
    Set(wxBelow, sibling, wxBottom, 0, marg);
}

//
// 'Same edge' alignment
//
void wxIndividualLayoutConstraint::SameAs(wxWindowBase *otherW, wxEdge edge, int marg)
{
    Set(wxPercentOf, otherW, edge, 100, marg);
}

// The edge is a percentage of the other window's edge
void wxIndividualLayoutConstraint::PercentOf(wxWindowBase *otherW, wxEdge wh, int per)
{
    Set(wxPercentOf, otherW, wh, per);
}

//
// Edge has absolute value
//
void wxIndividualLayoutConstraint::Absolute(int val)
{
    value = val;
    relationship = wxAbsolute;
}

// Reset constraint if it mentions otherWin
bool wxIndividualLayoutConstraint::ResetIfWin(wxWindowBase *otherW)
{
    if (otherW == otherWin)
    {
        myEdge = wxTop;
        relationship = wxAsIs;
        margin = 0;
        value = 0;
        percent = 0;
        otherEdge = wxTop;
        otherWin = (wxWindowBase *) NULL;
        return true;
    }

    return false;
}

// Try to satisfy constraint
bool wxIndividualLayoutConstraint::SatisfyConstraint(wxLayoutConstraints *constraints, wxWindowBase *win)
{
    if (relationship == wxAbsolute)
    {
        done = true;
        return true;
    }

    switch (myEdge)
    {
        case wxLeft:
        {
            switch (relationship)
            {
                case wxLeftOf:
                {
                    // We can know this edge if: otherWin is win's
                    // parent, or otherWin has a satisfied constraint,
                    // or otherWin has no constraint.
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = edgePos - margin;
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxRightOf:
                {
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = edgePos + margin;
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxPercentOf:
                {
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = (int)(edgePos*(((float)percent)*0.01) + margin);
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxUnconstrained:
                {
                    // We know the left-hand edge position if we know
                    // the right-hand edge and we know the width; OR if
                    // we know the centre and the width.
                    if (constraints->right.GetDone() && constraints->width.GetDone())
                    {
                        value = (constraints->right.GetValue() - constraints->width.GetValue() + margin);
                        done = true;
                        return true;
                    }
                    else if (constraints->centreX.GetDone() && constraints->width.GetDone())
                    {
                        value = (int)(constraints->centreX.GetValue() - (constraints->width.GetValue()/2) + margin);
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxAsIs:
                {
                    int y;
                    win->GetPosition(&value, &y);
                    done = true;
                    return true;
                }
                default:
                    break;
            }
            break;
        }
        case wxRight:
        {
            switch (relationship)
            {
                case wxLeftOf:
                {
                    // We can know this edge if: otherWin is win's
                    // parent, or otherWin has a satisfied constraint,
                    // or otherWin has no constraint.
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = edgePos - margin;
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxRightOf:
                {
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = edgePos + margin;
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxPercentOf:
                {
                    int edgePos = GetEdge(otherEdge, win, otherWin);
                    if (edgePos != -1)
                    {
                        value = (int)(edgePos*(((float)percent)*0.01) - margin);
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxUnconstrained:
                {
                    // We know the right-hand edge position if we know the
                    // left-hand edge and we know the width, OR if we know the
                    // centre edge and the width.
                    if (constraints->left.GetDone() && constraints->width.GetDone())
                    {
                        value = (constraints->left.GetValue() + constraints->width.GetValue() - margin);
                        done = true;
                        return true;
                    }
                    else if (constraints->centreX.GetDone() && constraints->width.GetDone())
                    {
                        value = (int)(constraints->centreX.GetValue() + (constraints->width.GetValue()/2) - margin);
                        done = true;
                        return true;
                    }
                    else
                        return false;
                }
                case wxAsIs:
                {
                    int x, y;
                    int w, h;
                    wxGetAsIs(win, &w, &h);
                    win->GetPosition(&x, &y);
                    value = x + w;
                    done = true;
                    return true;
                }
                default:
                    break;
            }
            break;
        }
        case wxTop:
        {
            switch (relationship)
            {
                case wxAbove:
                {