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List:       kde-core-devel
Subject:    KPushButton with drag-support
From:       Carsten Pfeiffer <carpdjih () cetus ! zrz ! TU-Berlin ! DE>
Date:       2000-10-27 23:29:57
[Download RAW message or body]

Hi,

I'd like to add a class KPushButton to kdeui, which adds drag-support to
QPushButton. I want to use it for example in KURLRequester, so you can do
a QUriDrag (or KURLDrag even) with the given URL.

Any comments, objections?

Cheers,
Carsten Pfeiffer

["kpushbutton.h" (text/plain)]

/* This file is part of the KDE libraries
    Copyright (C) 2000 Carsten Pfeiffer <pfeiffer@kde.org>

    library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/

#ifndef KPUSHBUTTON_H
#define KPUSHBUTTON_H

#include <qdragobject.h>
#include <qevent.h>
#include <qpoint.h>
#include <qpushbutton.h>


/**
 * This is nothing but a QPushButton with drag-support. You override the
 * virtual method @ref dragObject() to specify the QDragObject to be used.
 *
 * @short A QPushButton with drag-support
 * @author Carsten Pfeiffer <pfeiffer@kde.org>
 */
class KPushButton : public QPushButton
{
    Q_OBJECT

public:
    /**
     * Default constructor.
     */
    KPushButton( QWidget *parent, const char *name=0 );

    /**
     * Constructor, that sets the button-text to @p text
     */
    KPushButton( const QString &text, QWidget *parent, const char *name=0);

    /**
     * Constructor, that sets an icon and the button-text to @p text
     */
    KPushButton( const QIconSet &icon, const QString &text,
		     QWidget *parent, const char *name=0 );

    /**
     * Destroys the button
     */
    ~KPushButton();

    /**
     * Enables/disables drag-support. Default is enabled.
     */
    void setDragEnabled( bool enable );

    /**
     * @returns if drag support is enabled or not.
     */
    bool isDragEnabled() const { return m_dragEnabled; }


protected:
    /**
     * Reimplement this and return the QDragObject that should be used
     * for the drag.
     * Default implementation returns 0L, so that no drag is initiated.
     */
    virtual QDragObject * dragObject();

    /**
     * Reimplemented to add drag-support
     */
    virtual void mousePressEvent( QMouseEvent * );
    /**
     * Reimplemented to add drag-support
     */
    virtual void mouseMoveEvent( QMouseEvent * );
    
    /**
     * Starts a drag (dragCopy() by default) using @ref dragObject()
     */
    virtual void startDrag();
    
private:
    bool m_dragEnabled;
    QPoint startPos;

private:
    class KPushButtonPrivate;
    KPushButtonPrivate *d;

};

#endif // KPUSHBUTTON_H

["kpushbutton.cpp" (text/plain)]

/* This file is part of the KDE libraries
    Copyright (C) 2000 Carsten Pfeiffer <pfeiffer@kde.org>

    library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/

#include <kglobalsettings.h>

#include "kpushbutton.h"

KPushButton::KPushButton( QWidget *parent, const char *name )
    : QPushButton( parent, name ),
      m_dragEnabled( true )
{
}

KPushButton::KPushButton( const QString &text, QWidget *parent,
				  const char *name)
    : QPushButton( text, parent, name ),
      m_dragEnabled( true )
{
}

KPushButton::KPushButton( const QIconSet &icon, const QString &text,
				  QWidget *parent, const char *name )
    : QPushButton( icon, text, parent, name ),
      m_dragEnabled( true )
{
}

KPushButton::~KPushButton()
{
}


void KPushButton::setDragEnabled( bool enable )
{
    m_dragEnabled = enable;
}

void KPushButton::mousePressEvent( QMouseEvent *e )
{
    if ( m_dragEnabled )
	startPos = e->pos();
    QPushButton::mousePressEvent( e );
}

void KPushButton::mouseMoveEvent( QMouseEvent *e )
{
    if ( !m_dragEnabled )
	return QPushButton::mouseMoveEvent( e );

    if ( (e->state() & LeftButton) &&
	 (e->pos() - startPos).manhattanLength() >
	 KGlobalSettings::dndEventDelay() ) {
	
	startDrag();
	setDown( false );
    }
}

QDragObject * KPushButton::dragObject()
{
    return 0L;
}

void KPushButton::startDrag()
{
    QDragObject *d = dragObject();
    if ( d )
	d->dragCopy();
}

#include "kpushbutton.moc"


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