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/* -*- c++ -*-
kwidgetlister.h
This file is part of libtdenetwork.
Copyright (c) 2001 Marc Mutz <mutz@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License,
version 2, as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifh Floor, Boston, MA 02110-1301 USA
In addition, as a special exception, the copyright holders give
permission to link the code of this library with any edition of
the TQt library by Trolltech AS, Norway (or with modified versions
of TQt that use the same license as TQt), and distribute linked
combinations including the two. You must obey the GNU General
Public License in all respects for all of the code used other than
TQt. If you modify this file, you may extend this exception to
your version of the file, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from
your version.
*/
#ifndef _KWIDGETLISTER_H_
#define _KWIDGETLISTER_H_
#include <tqwidget.h>
#include <tqptrlist.h>
class KPushButton;
class TQVBoxLayout;
class TQHBox;
/** Simple widget that nonetheless does a lot of the dirty work for
the filter edit widgets (@ref KMSearchpatternEdit and @ref
KMFilterActionEdit). It provides a growable and shrinkable area
where widget may be displayed in rows. Widgets can be added by
hitting the provided 'More' button, removed by the 'Fewer' button
and cleared (e.g. reset, if an derived class implements that and
removed for all but @ref mMinWidgets).
To use this widget, derive from it with the template changed to
the type of widgets this class should list. Then reimplement @ref
addWidgetAtEnd, @ref removeLastWidget, calling the original
implementation as necessary. Instantate an object of the class and
put it in your dialog.
@short Widget that manages a list of other widgets (incl. 'more', 'fewer' and 'clear' buttons).
@author Marc Mutz <Marc@Mutz.com>
@see KMSearchPatternEdit::WidgetLister KMFilterActionEdit::WidgetLister
*/
class KWidgetLister : public TQWidget
{
Q_OBJECT
public:
KWidgetLister( int minWidgets=1, int maxWidgets=8, TQWidget* parent=0, const char* name=0 );
virtual ~KWidgetLister();
protected slots:
/** Called whenever the user clicks on the 'more' button.
Reimplementations should call this method, because this
implementation does all the dirty work with adding the widgets
to the layout (through @ref addWidgetAtEnd) and enabling/disabling
the control buttons. */
virtual void slotMore();
/** Called whenever the user clicks on the 'fewer' button.
Reimplementations should call this method, because this
implementation does all the dirty work with removing the widgets
from the layout (through @ref removelastWidget) and
enabling/disabling the control buttons. */
virtual void slotFewer();
/** Called whenever the user clicks on the 'clear' button.
Reimplementations should call this method, because this
implementation does all the dirty work with removing all but
@ref mMinWidets widgets from the layout and enabling/disabling
the control buttons. */
virtual void slotClear();
protected:
/** Adds a single widget. Doesn't care if there are already @ref
mMaxWidgets on screen and whether it should enable/disable any
controls. It simply does what it is asked to do. You want to
reimplement this method if you want to initialize the the widget
when showing it on screen. Make sure you call this
implementaion, though, since you cannot put the widget on screen
from derived classes (@p mLayout is private).
Make sure the parent of the TQWidget to add is this KWidgetLister. */
virtual void addWidgetAtEnd(TQWidget *w =0);
/** Removes a single (always the last) widget. Doesn't care if there
are still only @ref mMinWidgets left on screen and whether it
should enable/disable any controls. It simply does what it is
asked to do. You want to reimplement this method if you want to
save the the widget's state before removing it from screen. Make
sure you call this implementaion, though, since you should not
remove the widget from screen from derived classes. */
virtual void removeLastWidget();
/** Called to clear a given widget. The default implementation does
nothing. */
virtual void clearWidget( TQWidget* );
/** Because QT 2.x does not support signals/slots in template
classes, we are forced to emulate this by forcing the
implementers of subclasses of KWidgetLister to reimplement this
function which replaces the "@p new @p T" call. */
virtual TQWidget* createWidget( TQWidget *parent );
/** Sets the number of widgets on scrren to exactly @p aNum. Doesn't
check if @p aNum is inside the range @p
[mMinWidgets,mMaxWidgets]. */
virtual void setNumberOfShownWidgetsTo( int aNum );
/** The list of widgets. Note that this list is set to auto-delete,
meaning that widgets that are removed from the screen by either
@ref slotFewer or @ref slotClear will be destroyed! */
TQPtrList<TQWidget> mWidgetList;
/** The minimum number of widgets that are to stay on screen. */
int mMinWidgets;
/** The maximum number of widgets that are to be shown on screen. */
int mMaxWidgets;
signals:
/** This signal is emitted whenever a widget was added */
void widgetAdded();
/** This signal is emitted whenever a widget was added */
void widgetAdded(TQWidget *);
/** This signal is emitted whenever a widget was removed */
void widgetRemoved();
/** This signal is emitted whenever the clear button is clicked */
void clearWidgets();
private:
void enableControls();
KPushButton *mBtnMore, *mBtnFewer, *mBtnClear;
TQVBoxLayout *mLayout;
TQHBox *mButtonBox;
};
#endif /* _KWIDGETLISTER_H_ */
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