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/*********
*
* This file is part of BibleTime's source code, http://www.bibletime.info/.
*
* Copyright 1999-2006 by the BibleTime developers.
* The BibleTime source code is licensed under the GNU General Public License version 2.0.
*
**********/
#include "cscrollbutton.h"
#include "frontend/cbtconfig.h"
#include <stdlib.h>
#include <math.h>
//TQt includes
#include <tqevent.h>
#include <tqapplication.h>
#include <tqcursor.h>
CScrollButton::CScrollButton(TQWidget *parent, const char *name ) : TQToolButton(parent,name) {
setFocusPolicy(TQ_WheelFocus);
setCursor( splitVCursor );
m_isLocked = false;
connect(this, TQT_SIGNAL(pressed() ), TQT_SLOT(was_pressed() ));
connect(this, TQT_SIGNAL(released()), TQT_SLOT(was_released()));
}
const bool CScrollButton::isLocked( ) const {
return m_isLocked;
}
void CScrollButton::was_pressed( ) {
TQApplication::setOverrideCursor( BlankCursor );
m_isLocked = true;
lock_Point = get_lock_Point();
emit lock()
;
}
void CScrollButton::was_released( ) {
TQApplication::restoreOverrideCursor();
m_isLocked = false;
emit unlock();
}
const TQPoint CScrollButton::get_lock_Point() const {
return mapToGlobal( TQPoint( width()/2, height()/2 ) );
}
void CScrollButton::mouseMoveEvent( TQMouseEvent* e ) {
if (m_isLocked) {
int vchange = (TQCursor::pos().y() - lock_Point.y());
if (abs(vchange) < 10) {
vchange = (int)((vchange>0 ? 1 : -1) * pow(abs(vchange), 0.3));
}
else if (abs(vchange) < 30) {
vchange = (int)((vchange>0 ? 1 : -1) * pow(abs(vchange), 0.6));
}
else if (abs(vchange) < 40) {
vchange = (int)((vchange>0 ? 1 : -1) * pow(abs(vchange), 1.2));
}
else {
vchange = (int)((vchange>0 ? 1 : -1) * pow(abs(vchange), 2.0));
}
if (vchange) { //not emit 0
emit change_requested( vchange );
}
TQCursor::setPos( lock_Point );
}
else {
TQToolButton::mouseMoveEvent(e);
}
}
/** If the wheel of the mouse is used while the mouse stays over our scrollbutton the content is scrolled like the mouse was pressed and moved. */
void CScrollButton::wheelEvent( TQWheelEvent* e ) {
/**
* The problem is, that wheel events do everytime have the delta value 120
*/
const int vchange = ((e->delta() > 0) ? (1) : (-1));
if (vchange!=0) {//do not emit a change with value 0
emit change_requested( vchange );
e->accept();
}
else {
e->ignore();
}
}
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