From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sun, 10 Jul 2011 15:24:15 -0500 Subject: Add Qt3 development HEAD version --- doc/html/bigtable-example.html | 115 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 doc/html/bigtable-example.html (limited to 'doc/html/bigtable-example.html') diff --git a/doc/html/bigtable-example.html b/doc/html/bigtable-example.html new file mode 100644 index 0000000..8342c4c --- /dev/null +++ b/doc/html/bigtable-example.html @@ -0,0 +1,115 @@ + + + + + +How to create a large, sparse QTable + + + + + + + +

How to create a large, sparse QTable

+ + +

This example shows a sparse table implementation using a QIntDict to +keep track of the cells that are actually in use. +

Implementation: +

/****************************************************************************
+** $Id: qt/main.cpp   3.3.8   edited Jan 11 14:37 $
+**
+** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qapplication.h>
+#include <qtable.h>
+
+// Table size
+
+const int numRows = 1000000;
+const int numCols = 1000000;
+
+class MyTable : public QTable
+{
+public:
+    MyTable( int r, int c ) : QTable( r, c ) {
+        items.setAutoDelete( TRUE );
+        widgets.setAutoDelete( TRUE );
+        setCaption( tr( "A 1 Million x 1 Million Cell Table" ) );
+        setLeftMargin( fontMetrics().width( "W999999W" ) );
+    }
+
+    void resizeData( int ) {}
+    QTableItem *item( int r, int c ) const { return items.find( indexOf( r, c ) ); }
+    void setItem( int r, int c, QTableItem *i ) { items.replace( indexOf( r, c ), i ); }
+    void clearCell( int r, int c ) { items.remove( indexOf( r, c ) ); }
+    void takeItem( QTableItem *item )
+    {
+        items.setAutoDelete( FALSE );
+        items.remove( indexOf( item->row(), item->col() ) );
+        items.setAutoDelete( TRUE );
+    }
+    void insertWidget( int r, int c, QWidget *w ) { widgets.replace( indexOf( r, c ), w );  }
+    QWidget *cellWidget( int r, int c ) const { return widgets.find( indexOf( r, c ) ); }
+    void clearCellWidget( int r, int c )
+    {
+        QWidget *w = widgets.take( indexOf( r, c ) );
+        if ( w )
+            w->deleteLater();
+    }
+
+private:
+    QIntDict<QTableItem> items;
+    QIntDict<QWidget> widgets;
+
+};
+
+// The program starts here.
+
+int main( int argc, char **argv )
+{
+    QApplication app( argc, argv );
+
+    MyTable table( numRows, numCols );
+    app.setMainWidget( &table );
+    table.show();
+    return app.exec();
+}
+

+ +