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[dolphin.git] / src / kitemviews / private / kitemlistsmoothscroller.cpp

diff --git a/src/kitemviews/private/kitemlistsmoothscroller.cpp b/src/kitemviews/private/kitemlistsmoothscroller.cpp
index c89d3cf8f8d64d9e9f33d805b1b28764bd8ae573..f77d3df58d73e2a327ed17a93c4b1e48f051a797 100644 (file)
--- a/src/kitemviews/private/kitemlistsmoothscroller.cpp
+++ b/src/kitemviews/private/kitemlistsmoothscroller.cpp
@@ -1,30 +1,16 @@
-/***************************************************************************
- *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program 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 General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program; if not, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
- ***************************************************************************/
+/*
+ * SPDX-FileCopyrightText: 2011 Peter Penz <peter.penz19@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
 
 #include "kitemlistsmoothscroller.h"
 
 #include <QApplication>
-#include <QEvent>
 #include <QPropertyAnimation>
 #include <QScrollBar>
-#include <QWheelEvent>
 #include <QStyle>
+#include <QWheelEvent>
 
 KItemListSmoothScroller::KItemListSmoothScroller(QScrollBar* scrollBar,
                                                  QObject* parent) :
@@ -32,11 +18,12 @@ KItemListSmoothScroller::KItemListSmoothScroller(QScrollBar* scrollBar,
     m_scrollBarPressed(false),
     m_smoothScrolling(true),
     m_scrollBar(scrollBar),
-    m_animation(0)
+    m_animation(nullptr)
 {
     m_animation = new QPropertyAnimation(this);
-    const int duration = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, m_scrollBar) ? 100 : 1;
-    m_animation->setDuration(duration);
+    const int animationDuration = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, m_scrollBar);
+    const bool animationEnabled = (animationDuration > 0);
+    m_animation->setDuration(animationEnabled ? animationDuration : 1);
     connect(m_animation, &QPropertyAnimation::stateChanged,
             this, &KItemListSmoothScroller::slotAnimationStateChanged);
 
@@ -172,8 +159,7 @@ bool KItemListSmoothScroller::eventFilter(QObject* obj, QEvent* event)
         break;
 
     case QEvent::Wheel:
-        handleWheelEvent(static_cast<QWheelEvent*>(event));
-        return true; // eat event so that QScrollBar does not scroll one step more by itself
+        return false; // we're the ones sending them
 
     default:
         break;
@@ -185,10 +171,13 @@ bool KItemListSmoothScroller::eventFilter(QObject* obj, QEvent* event)
 void KItemListSmoothScroller::slotAnimationStateChanged(QAbstractAnimation::State newState,
                                                         QAbstractAnimation::State oldState)
 {
-    Q_UNUSED(oldState);
+    Q_UNUSED(oldState)
     if (newState == QAbstractAnimation::Stopped && m_smoothScrolling && !m_scrollBarPressed) {
         m_smoothScrolling = false;
     }
+    if (newState == QAbstractAnimation::Stopped) {
+        Q_EMIT scrollingStopped();
+    }
 }
 
 void KItemListSmoothScroller::handleWheelEvent(QWheelEvent* event)
@@ -196,25 +185,11 @@ void KItemListSmoothScroller::handleWheelEvent(QWheelEvent* event)
     const bool previous = m_smoothScrolling;
 
     m_smoothScrolling = true;
-    int numPixels;
-    if (!event->pixelDelta().isNull()) {
-        numPixels = event->pixelDelta().y();
-    } else {
-        const int numDegrees = event->angleDelta().y() / 8;
-        const int numSteps = qApp->wheelScrollLines() * numDegrees / 15;
-        numPixels = numSteps * m_scrollBar->pageStep() / 12;
-    }
-    int value = m_scrollBar->value();
-    if (event->modifiers().testFlag(Qt::ShiftModifier)) {
-        const int scrollingDirection = numPixels > 0 ? 1 : -1;
-        value -= m_scrollBar->pageStep() * scrollingDirection;
-    } else {
-        value -= numPixels;
-    }
-    m_scrollBar->setValue(value);
 
-    m_smoothScrolling = previous;
+    QWheelEvent copy = *event;
+    QApplication::sendEvent(m_scrollBar, &copy);
+    event->setAccepted(copy.isAccepted());
 
-    event->accept();
+    m_smoothScrolling = previous;
 }