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/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
* copyright (C) 2004-2006 *
* Umbrello UML Modeller Authors <uml-devel@uml.sf.net> *
***************************************************************************/
#ifndef TOOLBARSTATEASSOCIATION_H
#define TOOLBARSTATEASSOCIATION_H
#include "toolbarstatepool.h"
class TQCanvasLine;
/**
* Association tool to create associations between widgets.
* With association tool, two widgets are selected clicking with left button on
* them and an association of the needed type (depending on the association
* button selected) is created between the widgets. When the first widget is
* selected, a temporal visual association that follows the cursor movement is
* created until the second widget is selected or the association cancelled.
*
* Also, association tool can create association class: a classifier widget
* which is linked to an association. To do this, the classifier must be
* selected first and then the association must be selected. The association
* can't be selected first.
*
* An association can be cancelled using right button, which also returns to
* default tool, or with middle button, which only cancels the association
* without changing the tool being used.
*
* @todo refactor with common code in ToolBarStateMessages?
*/
class ToolBarStateAssociation : public ToolBarStatePool {
Q_OBJECT
public:
/**
* Creates a new ToolBarStateAssociation.
*
* @param umlView The UMLView to use.
*/
ToolBarStateAssociation(UMLView *umlView);
/**
* Destroys this ToolBarStateAssociation.
* Deletes the association line.
*/
virtual ~ToolBarStateAssociation();
/**
* Goes back to the initial state.
*/
virtual void init();
/**
* Called when the current tool is changed to use another tool.
* Executes base method and cleans the association.
*/
virtual void cleanBeforeChange();
/**
* Called when a mouse event happened.
* It executes the base method and then updates the position of the
* association line, if any.
*/
virtual void mouseMove(TQMouseEvent* ome);
public slots:
/**
* A widget was removed from the UMLView.
* If the widget removed was the current widget, the current widget is set
* to 0.
* Also, if it was the first widget, the association is cleaned.
*/
virtual void slotWidgetRemoved(UMLWidget* widget);
protected:
/**
* Called when the release event happened on an association.
* If the button pressed isn't left button, the association being created is
* cleaned. If it is left button, and the first widget is set and is a
* classifier widget, it creates an association class. Otherwise, the
* association being created is cleaned.
*/
virtual void mouseReleaseAssociation();
/**
* Called when the release event happened on a widget.
* If the button pressed isn't left button, the association is cleaned. If
* it is left button, sets the first widget or the second, depending on
* whether the first widget is already set or not.
*/
virtual void mouseReleaseWidget();
/**
* Called when the release event happened on an empty space.
* Cleans the association.
*/
virtual void mouseReleaseEmpty();
private:
/**
* Sets the first widget in the association using the current widget.
* If the widget can't be associated using the current type of association,
* an error is shown and the widget isn't set.
* Otherwise, the temporal visual association is created and the mouse
* tracking is enabled, so move events will be delivered.
*/
void setFirstWidget();
/**
* Sets the second widget in the association using the current widget and
* creates the association.
* If the association between the two widgets using the current type of
* association, an error is shown and the association cancelled.
* Otherwise, the association is created and added to the view, and the tool
* is changed to the default tool.
*
* @todo Why change to the default tool? Shouldn't it better to stay on
* association and let the user change with a right click? The tool to
* create widgets doesn't change to default after creating a widget
*/
void setSecondWidget();
/**
* Returns the association type of this tool.
*
* @return The association type of this tool.
*/
Uml::Association_Type getAssociationType();
/**
* Adds an AssociationWidget to the association list and creates the
* corresponding UMLAssociation in the current UMLDoc.
* If the association can't be added, is deleted.
*
* @param association The AssociationWidget to add.
*/
void addAssociationInViewAndDoc(AssociationWidget* association);
/**
* Cleans the first widget and the temporal association line, if any.
* Both are set to null, and the association line is also deleted.
*/
void cleanAssociation();
/**
* The first widget in the association.
*/
UMLWidget* m_firstWidget;
/**
* The association line shown while the first widget is selected and the
* second one wasn't selected yet.
*/
TQCanvasLine* m_associationLine;
};
#endif //TOOLBARSTATEASSOCIATION_H
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