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