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example3.cpp

Example 3

This example shows

• how to change the appearance of the section in the table's header.
• how to enable the selection of individual cells instead of rows (the default).

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The header file:

#ifndef _EXAMPLE3_H
#define _EXAMPLE3_H

#include <qwidget.h>

#include <qdbt/qdbtsection.h>

class QLabel;

class Example3 : public QWidget
{
  Example3( const Example3 & );
  void operator=( const Example3 & );

public:
  Example3( QWidget *parent = 0, const char *name = 0, WFlags f = 0 );
  ~Example3();
};

class Example3Section : public QdbtSection
{
  Example3Section( const Example3Section & );
  void operator=( const Example3Section & );

public:
  Example3Section( QdbtBaseTabular *parent = 0, const char *name = 0 );
  ~Example3Section();
  
  int widthHint() const;
  int heightHint() const;
  
protected:
  void drawButtonLabel( QPainter *p );
};

#endif

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The source file:

#include <qapplication.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qmenudata.h>
#include <qpainter.h>
#include <qpushbutton.h>
#include <qstyle.h>

#include "example3.h"

#include <qdbt/qdbtsection.h>
#include <qdbt/qdbttabcell.h>
#include <qdbt/qdbttabular.h>

const int tableRows = 20;
const int tableCols = 8; 

const int border = 5;

Example3Section::Example3Section( QdbtBaseTabular *parent, const char *name ) :
  QdbtSection( parent, name )
{
}

Example3Section::~Example3Section()
{
}

int Example3Section::widthHint() const
{
  return fontMetrics().height()+2*border;
}

int Example3Section::heightHint() const
{
  return fontMetrics().width(text())+2*border;
}

void Example3Section::drawButtonLabel( QPainter *p )
{
  QColorGroup g = colorGroup();
  p->setPen( g.text() );
  p->translate( width()/2+border, height()-border );
  p->rotate( -90 );
  p->drawText( 0, 0, text() );
  p->resetXForm();

  if ( hasFocus() )
  {
#if QT_VERSION >= 300
    QRect sr = style().subRect( QStyle::SR_PushButtonFocusRect, this );
    style().drawPrimitive ( QStyle::PE_FocusRect, p, sr, g,
                            QStyle::Style_HasFocus );
#else
    // for Qt-2.3.1 (at least) the focus rect is being draw somehow else...
#endif
  }
}


Example3::Example3( QWidget *parent, const char *name, WFlags f ) :
  QWidget( parent, name, f )
{
  // Set the caption of the window
  setCaption( "Example 3" );

  // The Layout managers
  QGridLayout *layout  = new QGridLayout( this, 2, 1, 5 );
  QBoxLayout  *buttons = new QBoxLayout( QBoxLayout::LeftToRight );
  
  // create three tables
  QdbtTabular *tabular = new QdbtTabular( this );

  // set the number of row/columns
  tabular->setDimensions( tableRows, tableCols );
 
  // set the minimum size of the table
  tabular->setMinimumSize( 200, 200 );

  // select cell instead of rows
  tabular->selectByRow( FALSE );

  // set the font of the heading
  tabular->setHeaderFont( QFont( "helvetica", 16, QFont::Bold ) );

  // set the font of the cells
  tabular->setCellFont( QFont( "helvetica", 12, QFont::Normal ) );

  int row, col;
  // for each column
  for ( col = 0; col < tableCols; col++ )
  {
    QString head;
    head.sprintf( "H%d", col );
    
    // set the heading of column `col'
    Example3Section *section = new Example3Section( tabular );
    section->setText( head );
    tabular->changeSection( section, col );
 
    // for each row
    for ( row = 0; row < tableRows; row++ )
    {
      QdbtTableCell cell;
      QString cellName;
      cellName.sprintf( "cell (%d,%d)", row, col );
      cell.setText( cellName );
      cell.setEditable( TRUE );
      // set the cell's text
      tabular->changeCell( &cell, row, col );
    }
  }

  // make sure all cells fit
  tabular->fitAll();

  // Create the close button
  QPushButton *close  = new QPushButton( "Close", this );

  // Set its minimum sizes
  close->setMinimumSize( close->sizeHint() );

  // Add Widgets and layouts to the layout-manager
  layout->addWidget( tabular, 0, 0 );
  layout->addLayout( buttons, 1, 0 );
  layout->setColStretch( 0, 1 ); // make the table strechable
  layout->setRowStretch( 0, 1 );

  // Add the Widget to the button layout
  buttons->addStretch( 1 );
  buttons->addWidget( close );

  // don't forget to activate the top layout manager
  layout->activate();

  // Let the close button quit the application
  connect( close, SIGNAL( clicked() ), qApp, SLOT( quit() ) );
  
  // Resize the widget to its minimal size
  resize( layout->mainWidget()->sizeHint() );
}

Example3::~Example3()
{
}

int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  Example3 example;
  app.setMainWidget( &example );
  example.show();
  return app.exec();  
}

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