/* -*- c++ -*- kwidgetlister.h This file is part of libtdenetwork. Copyright (c) 2001 Marc Mutz 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 #include 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 @see KMSearchPatternEdit::WidgetLister KMFilterActionEdit::WidgetLister */ class KWidgetLister : public TQWidget { Q_OBJECT TQ_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 tqlayout (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 tqlayout (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 tqlayout 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 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_ */