This class provides basic functionality to manipulate intervals of Qt_widget class. Qt_widget knows about the current visible area that is specified through an interval. The default one is (-1, 1, -1, 1). This class is mostly used by the Qt_widget_standard_toolbar to provide the backward and the forward navigation through the different intervals.

#include <CGAL/IO/Qt_widget_history.h>

Inherits From



Qt_widget_history history ( Qt_widget* parent, const char *name = 0);
parent is the parent widget that has to be a Qt_widget and name is the name of the history. This will create a history object that can deal with the Qt_widget visualisation intervals. Each time the visible area will change, it's interval will be stored in the history list.

public slots:

void () This saves the widget visible area in the history list.

void history.backward () This goes back in the list of saved intervals.

void history.forward () This goes forward in the list of saved intervals.

void history.clear () This will clear the entire history list.


void history.backwardAvaillable ( bool)
void history.forwardAvaillable ( bool) This two signals are emited when there are available items in the history list as regards to the current position in the list.