wx_grid.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2018-2021 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <wx/tokenzr.h>
#include <wx/dc.h>
#include <widgets/wx_grid.h>
#include <widgets/ui_common.h>
#include <algorithm>


#define MIN_GRIDCELL_MARGIN 3


WX_GRID::WX_GRID( wxWindow *parent, wxWindowID id, const wxPoint& pos, const wxSize& size,
 long style, const wxString& name ) :
 wxGrid( parent, id, pos, size, style, name ),
 m_weOwnTable( false )
{
 SetDefaultCellOverflow( false );

 // Make sure the GUI font scales properly on GTK
 SetDefaultCellFont( KIUI::GetControlFont( this ) );

#if wxCHECK_VERSION( 3, 1, 0 )
 Connect( wxEVT_DPI_CHANGED, wxDPIChangedEventHandler( WX_GRID::onDPIChanged ), nullptr, this );
#endif

}


WX_GRID::~WX_GRID()
{
 if( m_weOwnTable )
 DestroyTable( GetTable() );

#if wxCHECK_VERSION( 3, 1, 0 )
 Disconnect( wxEVT_DPI_CHANGED, wxDPIChangedEventHandler( WX_GRID::onDPIChanged ), nullptr, this );
#endif

}


#if wxCHECK_VERSION( 3, 1, 0 )
void WX_GRID::onDPIChanged(wxDPIChangedEvent& aEvt)
{
#ifndef __WXMAC__
 aEvt.Skip();
#endif
}
#endif

void WX_GRID::SetColLabelSize( int aHeight )
{
 if( aHeight == 0 )
 {
 wxGrid::SetColLabelSize( 0 );
 return;
 }

 wxFont headingFont = KIUI::GetControlFont( this ).Bold();

 // Make sure the GUI font scales properly on GTK
 SetLabelFont( headingFont );

 // Correct wxFormBuilder height for large fonts
 int minHeight = headingFont.GetPixelSize().y + 2 * MIN_GRIDCELL_MARGIN;
 wxGrid::SetColLabelSize( std::max( aHeight, minHeight ) );
}


void WX_GRID::SetTable( wxGridTableBase* aTable, bool aTakeOwnership )
{
 // wxGrid::SetTable() messes up the column widths from wxFormBuilder so we have to save
 // and restore them.
 int numberCols = GetNumberCols();
 int* formBuilderColWidths = new int[numberCols];

 for( int i = 0; i < numberCols; ++i )
 formBuilderColWidths[ i ] = GetColSize( i );

 wxGrid::SetTable( aTable );

 // wxGrid::SetTable() may change the number of columns, so prevent out-of-bounds access
 // to formBuilderColWidths
 numberCols = std::min( numberCols, GetNumberCols() );

 for( int i = 0; i < numberCols; ++i )
 {
 // correct wxFormBuilder width for large fonts and/or long translations
 int headingWidth = GetTextExtent( GetColLabelValue( i ) ).x + 2 * MIN_GRIDCELL_MARGIN;

 SetColSize( i, std::max( formBuilderColWidths[ i ], headingWidth ) );
 }

 delete[] formBuilderColWidths;

 Connect( wxEVT_GRID_COL_MOVE, wxGridEventHandler( WX_GRID::onGridColMove ), nullptr, this );
 Connect( wxEVT_GRID_SELECT_CELL, wxGridEventHandler( WX_GRID::onGridCellSelect ), nullptr, this );

 m_weOwnTable = aTakeOwnership;
}


void WX_GRID::onGridCellSelect( wxGridEvent& aEvent )
{
 // Highlight the selected cell.
 // Calling SelectBlock() allows a visual effect when cells are selected
 // by tab or arrow keys.
 // Otherwise, one cannot really know what actual cell is selected
 int row = aEvent.GetRow();
 int col = aEvent.GetCol();

 if( row >= 0 && col >= 0 )
 SelectBlock(row,col,row,col,false);
}

void WX_GRID::DestroyTable( wxGridTableBase* aTable )
{
 // wxGrid's destructor will crash trying to look up the cell attr if the edit control
 // is left open. Normally it's closed in Validate(), but not if the user hit Cancel.
 CommitPendingChanges( true /* quiet mode */ );

 Disconnect( wxEVT_GRID_COL_MOVE, wxGridEventHandler( WX_GRID::onGridColMove ), nullptr, this );
 Disconnect( wxEVT_GRID_SELECT_CELL, wxGridEventHandler( WX_GRID::onGridCellSelect ), nullptr, this );

 wxGrid::SetTable( nullptr );
 delete aTable;
}


wxString WX_GRID::GetShownColumns()
{
 wxString shownColumns;

 for( int i = 0; i < GetNumberCols(); ++i )
 {
 if( IsColShown( i ) )
 {
 if( shownColumns.Length() )
 shownColumns << wxT( " " );

 shownColumns << i;
 }
 }

 return shownColumns;
}


void WX_GRID::ShowHideColumns( const wxString& shownColumns )
{
 for( int i = 0; i < GetNumberCols(); ++i )
 HideCol( i );

 wxStringTokenizer shownTokens( shownColumns );

 while( shownTokens.HasMoreTokens() )
 {
 long colNumber;
 shownTokens.GetNextToken().ToLong( &colNumber );

 if( colNumber >= 0 && colNumber < GetNumberCols() )
 ShowCol( colNumber );
 }
}


void WX_GRID::DrawColLabel( wxDC& dc, int col )
{
 if( GetColWidth( col ) <= 0 || m_colLabelHeight <= 0 )
 return;

 int colLeft = GetColLeft( col );

 wxRect rect( colLeft, 0, GetColWidth( col ), m_colLabelHeight );
 static wxGridColumnHeaderRendererDefault rend;

 // It is reported that we need to erase the background to avoid display
 // artifacts, see #12055.
 // wxWidgets renamed this variable between 3.1.2 and 3.1.3 ...
#if wxCHECK_VERSION( 3, 1, 3 )
 wxDCBrushChanger setBrush( dc, m_colLabelWin->GetBackgroundColour() );
#else
 wxDCBrushChanger setBrush( dc, m_colWindow->GetBackgroundColour() );
#endif
 dc.DrawRectangle(rect);

 rend.DrawBorder( *this, dc, rect );

 // Make sure fonts get scaled correctly on GTK HiDPI monitors
 dc.SetFont( GetLabelFont() );

 int hAlign, vAlign;
 GetColLabelAlignment( &hAlign, &vAlign );
 const int orient = GetColLabelTextOrientation();

 if( col == 0 && GetRowLabelSize() == 0 )
 hAlign = wxALIGN_LEFT;

 rend.DrawLabel( *this, dc, GetColLabelValue( col ), rect, hAlign, vAlign, orient );
}


bool WX_GRID::CommitPendingChanges( bool aQuietMode )
{
 if( !IsCellEditControlEnabled() )
 return true;

 if( !aQuietMode && SendEvent( wxEVT_GRID_EDITOR_HIDDEN ) == -1 )
 return false;

 HideCellEditControl();

 // do it after HideCellEditControl()
 m_cellEditCtrlEnabled = false;

 int row = m_currentCellCoords.GetRow();
 int col = m_currentCellCoords.GetCol();

 wxString oldval = GetCellValue( row, col );
 wxString newval;

 wxGridCellAttr* attr = GetCellAttr( row, col );
 wxGridCellEditor* editor = attr->GetEditor( this, row, col );

 bool changed = editor->EndEdit( row, col, this, oldval, &newval );

 editor->DecRef();
 attr->DecRef();

 if( changed )
 {
 if( !aQuietMode && SendEvent( wxEVT_GRID_CELL_CHANGING, newval ) == -1 )
 return false;

 editor->ApplyEdit( row, col, this );

 // for compatibility reasons dating back to wx 2.8 when this event
 // was called wxEVT_GRID_CELL_CHANGE and wxEVT_GRID_CELL_CHANGING
 // didn't exist we allow vetoing this one too
 if( !aQuietMode && SendEvent( wxEVT_GRID_CELL_CHANGED, oldval ) == -1 )
 {
 // Event has been vetoed, set the data back.
 SetCellValue( row, col, oldval );
 return false;
 }
 }

 return true;
}


void WX_GRID::onGridColMove( wxGridEvent& aEvent )
{
 // wxWidgets won't move an open editor, so better just to close it
 CommitPendingChanges( true );
}


int WX_GRID::GetVisibleWidth( int aCol, bool aHeader, bool aContents, bool aKeep )
{
 int size = 0;

 if( aCol < 0 )
 {
 if( aKeep )
 size = GetRowLabelSize();

 // The 1.1 scale factor is due to the fact row labels use a bold font, bigger than
 // the normal font.
 // TODO: use a better way to evaluate the text size, for bold font
 for( int row = 0; aContents && row < GetNumberRows(); row++ )
 size = std::max( size, int( GetTextExtent( GetRowLabelValue( row ) + wxT( "M" ) ).x * 1.1 ) );
 }
 else
 {
 if( aKeep )
 size = GetColSize( aCol );

 // 'M' is generally the widest character, so we buffer the column width by default to
 // ensure we don't write a continuous line of text at the column header
 if( aHeader )
 {
 EnsureColLabelsVisible();

 // The 1.1 scale factor is due to the fact headers use a bold font, bigger than
 // the normal font.
 size = std::max( size, int( GetTextExtent( GetColLabelValue( aCol ) + wxT( "M" ) ).x * 1.1 ) );
 }

 for( int row = 0; aContents && row < GetNumberRows(); row++ )
 {
 // If we have text, get the size. Otherwise, use a placeholder for the checkbox
 if( GetTable()->CanGetValueAs( row, aCol, wxGRID_VALUE_STRING ) )
 size = std::max( size, GetTextExtent( GetCellValue( row, aCol ) + wxT( "M" ) ).x );
 else
 size = std::max( size, GetTextExtent( "MM" ).x );
 }
 }

 return size;
}


void WX_GRID::EnsureColLabelsVisible()
{
 // The 1.1 scale factor is due to the fact row labels use a bold font, bigger than
 // the normal font
 // TODO: use a better way to evaluate the text size, for bold font
 int line_height = int( GetTextExtent( "Mj" ).y * 1.1 ) + 3;
 int row_height = GetColLabelSize();
 int initial_row_height = row_height;

 // Headers can be multiline. Fix the Column Label Height to show the full header
 // However GetTextExtent does not work on multiline strings,
 // and do not return the full text height (only the height of one line)
 for( int col = 0; col < GetNumberCols(); col++ )
 {
 int nl_count = GetColLabelValue( col ).Freq( '\n' );

 if( nl_count )
 {
 // Col Label height must be able to show nl_count+1 lines
 if( row_height < line_height * ( nl_count+1 ) )
 row_height += line_height * nl_count;
 }
 }

 // Update the column label size, but only if needed, to avoid generating useless
 // and perhaps annoying UI events when the size does not change
 if( initial_row_height != row_height )
 SetColLabelSize( row_height );
}