wxdataviewctrl_helpers.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program 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 3 of the License, or (at your
 * option) any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <wx/dataview.h>
#include <wxdataviewctrl_helpers.h>

wxDataViewItem GetPrevItem( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
 auto prevItem = GetPrevSibling( aView, aItem );

 if( !prevItem.IsOk() )
 {
 prevItem = aView.GetModel()->GetParent( aItem );
 }
 else if( aView.IsExpanded( prevItem ) )
 {
 wxDataViewItemArray children;
 aView.GetModel()->GetChildren( prevItem, children );
 prevItem = children[children.size() - 1];
 }

 return prevItem;
}


wxDataViewItem GetNextItem( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
 wxDataViewItem nextItem;
 wxDataViewItem invalid;

 if( !aItem.IsOk() )
 {
 // No selection. Select the first.
 wxDataViewItemArray children;
 aView.GetModel()->GetChildren( aItem, children );

 if( children.size() )
 return children[0];

 return invalid;
 }

 if( aView.IsExpanded( aItem ) )
 {
  wxDataViewItemArray children;
 aView.GetModel()->GetChildren( aItem, children );

 if( children.size() )
 return children[0];

 return invalid;
 }
 else
 {
 // Walk up levels until we find one that has a next sibling.
 for( wxDataViewItem walk = aItem; walk.IsOk(); walk = aView.GetModel()->GetParent( walk ) )
 {
 nextItem = GetNextSibling( aView, walk );

 if( nextItem.IsOk() )
 break;
 }
 }

 return nextItem;
}


wxDataViewItem GetPrevSibling( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
 wxDataViewItemArray siblings;
 wxDataViewItem invalid;
 wxDataViewItem parent = aView.GetModel()->GetParent( aItem );

 aView.GetModel()->GetChildren( parent, siblings );

 for( size_t i = 0; i < siblings.size(); ++i )
 {
 if( siblings[i] == aItem )
 {
 if( i == 0 )
 return invalid;
 else
 return siblings[i - 1];
 }
 }

 return invalid;
}


wxDataViewItem GetNextSibling( wxDataViewCtrl const& aView, wxDataViewItem const& aItem )
{
 wxDataViewItemArray siblings;
 wxDataViewItem invalid;
 wxDataViewItem parent = aView.GetModel()->GetParent( aItem );

 aView.GetModel()->GetChildren( parent, siblings );

 for( size_t i = 0; i < siblings.size(); ++i )
 {
 if( siblings[i] == aItem )
 {
 if( i == siblings.size() - 1 )
 return invalid;
 else
 return siblings[i + 1];
 }
 }

 return invalid;
}