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/*********
*
* This file is part of BibleTime's source code, http://www.bibletime.info/.
*
* Copyright 1999-2009 by the BibleTime developers.
* The BibleTime source code is licensed under the GNU General Public License version 2.0.
*
**********/
#include "frontend/keychooser/cscrollbutton.h"
#include <cmath>
#include <QApplication>
#include <QCursor>
#include <QEvent>
#include <QMouseEvent>
#include <QPoint>
#include <QWheelEvent>
CScrollButton::CScrollButton(QWidget *parent)
: QToolButton(parent), m_isLocked(false) {
setFocusPolicy(Qt::WheelFocus);
setCursor(Qt::SplitVCursor);
}
CScrollButton::~CScrollButton() {
// Intentionally empty
}
void CScrollButton::mousePressEvent(QMouseEvent *e) {
if (m_isLocked) return;
if (e->button() != Qt::LeftButton) return;
m_isLocked = true;
grabMouse(Qt::BlankCursor);
emit lock();
}
void CScrollButton::mouseReleaseEvent(QMouseEvent *e) {
if (!m_isLocked) return;
if (e->button() != Qt::LeftButton) return;
m_isLocked = false;
releaseMouse();
emit unlock();
}
void CScrollButton::mouseMoveEvent(QMouseEvent *e) {
if (m_isLocked) {
// Recalculate the center of the widget (might change during grab):
QPoint center(mapToGlobal(QPoint(width() / 2, height() / 2)));
// Calculate movement change:
int vchange = (e->globalY() - center.y());
if (vchange != 0) {
// Calculate the real change we are going to emit:
int avchange(vchange >= 0 ? vchange : -vchange);
if (avchange < 10) {
avchange = (int) pow(avchange, 0.3);
}
else if (avchange < 30) {
avchange = (int) pow(avchange, 0.6);
}
else if (avchange < 40) {
avchange = (int) pow(avchange, 1.2);
}
else {
avchange = (int) pow(avchange, 2.0);
}
// Emit the change request signal only when necessary:
if (avchange != 0) {
if (vchange > 0) {
emit change_requested(avchange);
}
else if (vchange < 0) {
emit change_requested(-avchange);
}
}
}
// Move the mouse cursor to the center of this widget:
QCursor::setPos(center);
}
else {
QToolButton::mouseMoveEvent(e);
}
}
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