Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 189 insertions, 0 deletions

diff --git a/kdeui/kscrollview.cpp b/kdeui/kscrollview.cpp
new file mode 100644
index 000000000..779f6a62b
--- /dev/null
+++ b/kdeui/kscrollview.cpp
@@ -0,0 +1,189 @@
+/* This file is part of the KDE libraries
+   Copyright (C) 2005 Allan Sandfeld Jensen <kde@carewolf.com>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License version 2 as published by the Free Software Foundation.
+
+   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., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#include "config.h"
+
+#include <qtimer.h>
+#include <qevent.h>
+#include <qapplication.h>
+
+#include "kscrollview.h"
+#include <kdebug.h>
+#include <kconfig.h>
+#include <kglobal.h>
+
+struct KScrollView::KScrollViewPrivate {
+    KScrollViewPrivate() : dx(0), dy(0), ddx(0), ddy(0), rdx(0), rdy(0), scrolling(false) {}
+    QTimer timer;
+    int dx;
+    int dy;
+    // Step size * 16 and residual to avoid huge difference between 1px/step and 2px/step
+    int ddx;
+    int ddy;
+    int rdx;
+    int rdy;
+    bool scrolling;
+};
+
+KScrollView::KScrollView( QWidget *parent, const char *name, Qt::WFlags f )
+    : QScrollView( parent, name, f )
+{
+    d = new KScrollViewPrivate;
+    connect(&d->timer, SIGNAL(timeout()), this, SLOT(scrollTick()));
+}
+
+KScrollView::~KScrollView()
+{
+    delete d;
+}
+
+void KScrollView::scrollBy(int dx, int dy)
+{
+    KConfigGroup cfg( KGlobal::config(), "KDE" );
+    if( !cfg.readBoolEntry( "SmoothScrolling", true )) {
+        QScrollView::scrollBy( dx, dy );
+        return;
+    }
+    // scrolling destination
+    int full_dx = d->dx + dx;
+    int full_dy = d->dy + dy;
+
+    // scrolling speed
+    int ddx = 0;
+    int ddy = 0;
+
+    int steps = SCROLL_TIME/SCROLL_TICK;
+
+    ddx = (full_dx*16)/steps;
+    ddy = (full_dy*16)/steps;
+
+    // don't go under 1px/step
+    if (ddx > 0 && ddx < 16) ddx = 16;
+    if (ddy > 0 && ddy < 16) ddy = 16;
+    if (ddx < 0 && ddx > -16) ddx = -16;
+    if (ddy < 0 && ddy > -16) ddy = -16;
+
+    d->dx = full_dx;
+    d->dy = full_dy;
+    d->ddx = ddx;
+    d->ddy = ddy;
+
+    if (!d->scrolling) {
+        scrollTick();
+        startScrolling();
+    }
+}
+/*
+void KScrollView::scrollBy(int dx, int dy)
+{
+    if (d->scrolling)
+        setContentsPos( d->x+dx, d->y+dy );
+    else
+        setContentsPos( contentsX() + dx, contentsY() + dy);
+}
+
+void KScrollView::setContentsPos(int x, int y)
+{
+    if (x < 0) x = 0;
+    if (y < 0) y = 0;
+
+    int dx = x - contentsX();
+    int dy = y - contentsY();
+
+    // to large to smooth out
+//     if (dx > 1000 || dy > 1000) return QScrollView::setContentsPos(x,y);
+
+    // scrolling speed
+    int ddx = 0;
+    int ddy = 0;
+
+    int steps = SCROLL_TIME/SCROLL_TICK;
+
+    ddx = (dx*16)/steps;
+    ddy = (dy*16)/steps;
+
+    d->x = x;
+    d->y = y;
+    d->dx = dx;
+    d->dy = dy;
+    d->ddx = ddx;
+    d->ddy = ddy;
+
+    if (!d->scrolling) {
+        scrollTick();
+        startScrolling();
+    }
+} */
+
+void KScrollView::scrollTick() {
+    if (d->dx == 0 && d->dy == 0) {
+        stopScrolling();
+        return;
+    }
+
+    int tddx = d->ddx + d->rdx;
+    int tddy = d->ddy + d->rdy;
+
+    int ddx = tddx / 16;
+    int ddy = tddy / 16;
+    d->rdx = tddx % 16;
+    d->rdy = tddy % 16;
+
+    if (d->dx > 0 && ddx > d->dx) ddx = d->dx;
+    else
+    if (d->dx < 0 && ddx < d->dx) ddx = d->dx;
+
+    if (d->dy > 0 && ddy > d->dy) ddy = d->dy;
+    else
+    if (d->dy < 0 && ddy < d->dy) ddy = d->dy;
+
+    d->dx -= ddx;
+    d->dy -= ddy;
+
+//    QScrollView::setContentsPos( contentsX() + ddx, contentsY() + ddy);
+    QScrollView::scrollBy(ddx, ddy);
+}
+
+void KScrollView::startScrolling()
+{
+    d->scrolling = true;
+    d->timer.start(SCROLL_TICK, false);
+}
+
+void KScrollView::stopScrolling()
+{
+    d->timer.stop();
+    d->dx = d->dy = 0;
+    d->scrolling = false;
+}
+
+// Overloaded from QScrollView and QScrollBar
+void KScrollView::wheelEvent( QWheelEvent *e )
+{
+    int pageStep = verticalScrollBar()->pageStep();
+    int lineStep = verticalScrollBar()->lineStep();
+    int step = QMIN( QApplication::wheelScrollLines()*lineStep, pageStep );
+    if ( ( e->state() & ControlButton ) || ( e->state() & ShiftButton ) )
+        step = pageStep;
+
+    int dy = (e->delta()*step)/120;
+    scrollBy(0,-dy);
+    e->accept();
+}
+
+#include "kscrollview.moc"