## CGAL::Qt_widget_standard_toolbar

### Definition

The standard toolbar includes the basic tools used for zooming and translating in a Qt_widget.

#include <CGAL/IO/Qt_widget_standard_toolbar.h>

### Inherits From

QToolBar

### Creation

Qt_widget_standard_toolbar stoolbar ( | Qt_widget *w, QMainWindow *mw, QWidget* parent, bool newline = true, const char* name = 0);

This constructor creates a new toolbar, called name, in your application, containing all the standard tools. The first parameter w is a non-null pointer to the Qt_widget object on which the toolbar functionalities act. The second parameter mw is a pointer to the QMainWindow that manages the toolbar. The later is added to the top area of the QMainWindow, unless mw=0. mw, parent, newline, name are passed to the QMainWindow constructor (with first parameter label=''Qt_widget standard toolbar'' 1).

Qt_widget_standard_toolbar stoolbar ( | Qt_widget *w, QMainWindow *parent = 0, const char* name = 0);

| Simplified version of the previous one. The parent is the QMainWindow that manages the toolbar.

const QToolBar* | stoolbar.toolbar ()
|  | Deprecated: (in CGAL-2.4 the standard toolbar was not derived from QToolBar) Returns a pointer to the QToolBar this itself.

### public slots:

void | stoolbar.back () | Goes back in the history list of the standard toolbar.
void | stoolbar.forward ()
|  | Goes forward in the history list of the standard toolbar.
void | stoolbar.clear_history ()
|  | Clears the history list of the standard toolbar.

### Example

    #include <CGAL/Cartesian.h>
    #include <CGAL/Point_2.h>
    #include <CGAL/Delaunay_triangulation_2.h>
    #include <CGAL/IO/Qt_widget_Delaunay_triangulation_2.h>

    #include <qapplication.h>
    #include <qmainwindow.h>

    #include <CGAL/IO/Qt_widget.h>
    #include <CGAL/IO/Qt_widget_layer.h>
    #include <CGAL/IO/Qt_widget_standard_toolbar.h>

    typedef CGAL::Cartesian<double>             Rep;
    typedef CGAL::Point_2<Rep>                  Point;
    typedef CGAL::Delaunay_triangulation_2<Rep> Delaunay;

    Delaunay dt;

    class My_layer : public CGAL::Qt_widget_layer{
      void draw(){
        *widget << CGAL::BLACK;
        *widget << dt;
      }
    };

    class My_widget : public CGAL::Qt_widget {
    public:
      My_widget(QMainWindow* c) : CGAL::Qt_widget(c) {};
    private:
      //this event is called only when the user presses the mouse
      void mousePressEvent(QMouseEvent *e)
      {
        Qt_widget::mousePressEvent(e);
        dt.insert(Point(x_real(e->x()), y_real(e->y())));
        redraw();
      }
    };

    class My_window : public QMainWindow{
    public:
      My_window(int x, int y)
      {
        widget = new My_widget(this);
        setCentralWidget(widget);
        resize(x,y);
        widget->set_window(0, x, 0, y);

        //How to attach the standard toolbar
        stoolbar = new CGAL::Qt_widget_standard_toolbar(widget, this,
                                                        "Standard toolbar");
        widget->attach(&v);
      }
    private:
      My_widget *widget;
      My_layer  v;
      CGAL::Qt_widget_standard_toolbar *stoolbar;
    };

    int main( int argc, char **argv )
    {
        QApplication app( argc, argv );
        My_window W(400,400);
        app.setMainWidget( &W );
        W.show();
        W.setCaption("Using the Standard Toolbar");
        return app.exec();
    }

This example is implemented in the fifth tutorial. You can look over the code to see how the code works.

### Footnotes

1 | but this can change in future version