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Diffstat (limited to 'tdeui/kscrollview.cpp')
| -rw-r--r-- | tdeui/kscrollview.cpp | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/tdeui/kscrollview.cpp b/tdeui/kscrollview.cpp new file mode 100644 index 000000000..1d37d03d3 --- /dev/null +++ b/tdeui/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 <tqtimer.h> +#include <tqevent.h> +#include <tqapplication.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) {} + TQTimer 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( TQWidget *parent, const char *name, Qt::WFlags f ) + : TQScrollView( parent, name, f ) +{ + d = new KScrollViewPrivate; + connect(&d->timer, TQT_SIGNAL(timeout()), this, TQT_SLOT(scrollTick())); +} + +KScrollView::~KScrollView() +{ + delete d; +} + +void KScrollView::scrollBy(int dx, int dy) +{ + KConfigGroup cfg( KGlobal::config(), "KDE" ); + if( !cfg.readBoolEntry( "SmoothScrolling", true )) { + TQScrollView::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 TQScrollView::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; + +// TQScrollView::setContentsPos( contentsX() + ddx, contentsY() + ddy); + TQScrollView::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 TQScrollView and QScrollBar +void KScrollView::wheelEvent( TQWheelEvent *e ) +{ + int pageStep = verticalScrollBar()->pageStep(); + int lineStep = verticalScrollBar()->lineStep(); + int step = QMIN( TQApplication::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" |