diff options
Diffstat (limited to 'src/frontend/keychooser/cscrollbutton.cpp')
| -rw-r--r-- | src/frontend/keychooser/cscrollbutton.cpp | 116 |
1 files changed, 57 insertions, 59 deletions
diff --git a/src/frontend/keychooser/cscrollbutton.cpp b/src/frontend/keychooser/cscrollbutton.cpp index 742bc53..3287eef 100644 --- a/src/frontend/keychooser/cscrollbutton.cpp +++ b/src/frontend/keychooser/cscrollbutton.cpp @@ -2,20 +2,14 @@ * * This file is part of BibleTime's source code, http://www.bibletime.info/. * -* Copyright 1999-2008 by the BibleTime developers. +* Copyright 1999-2009 by the BibleTime developers. * The BibleTime source code is licensed under the GNU General Public License version 2.0. * **********/ - - #include "cscrollbutton.h" - -#include <stdlib.h> -#include <math.h> - -//Qt includes +#include <cmath> #include <QEvent> #include <QApplication> #include <QCursor> @@ -23,63 +17,67 @@ #include <QMouseEvent> #include <QWheelEvent> -CScrollButton::CScrollButton(QWidget *parent) : QToolButton(parent) { - setFocusPolicy(Qt::WheelFocus); - setCursor(Qt::SplitVCursor ); - - m_isLocked = false; - connect(this, SIGNAL(pressed() ), SLOT(was_pressed() )); - connect(this, SIGNAL(released()), SLOT(was_released())); -} - -bool CScrollButton::isLocked( ) const { - return m_isLocked; +CScrollButton::CScrollButton(QWidget *parent) + : QToolButton(parent), m_isLocked(false) +{ + setFocusPolicy(Qt::WheelFocus); + setCursor(Qt::SplitVCursor); } -void CScrollButton::was_pressed( ) { - QApplication::setOverrideCursor(Qt::BlankCursor); - m_isLocked = true; - lock_Point = get_lock_Point(); - - emit lock() - ; +CScrollButton::~CScrollButton() { + // Intentionally empty } -void CScrollButton::was_released( ) { - QApplication::restoreOverrideCursor(); - m_isLocked = false; - - emit unlock(); +void CScrollButton::mousePressEvent(QMouseEvent *e) { + if (m_isLocked) return; + if (e->button() != Qt::LeftButton) return; + m_isLocked = true; + grabMouse(Qt::BlankCursor); + emit lock(); } -const QPoint CScrollButton::get_lock_Point() const { - return mapToGlobal( QPoint( width()/2, height()/2 ) ); +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) { - int vchange = (QCursor::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 ); - } - - QCursor::setPos( lock_Point ); - } - else { - QToolButton::mouseMoveEvent(e); - } +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); + } } |