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Diffstat (limited to 'src/gui/general/RosegardenScrollView.cpp')
| -rw-r--r-- | src/gui/general/RosegardenScrollView.cpp | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/src/gui/general/RosegardenScrollView.cpp b/src/gui/general/RosegardenScrollView.cpp new file mode 100644 index 0000000..fbcaf79 --- /dev/null +++ b/src/gui/general/RosegardenScrollView.cpp @@ -0,0 +1,416 @@ +/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ + +/* + Rosegarden + A MIDI and audio sequencer and musical notation editor. + + This program is Copyright 2000-2008 + Guillaume Laurent <[email protected]>, + Chris Cannam <[email protected]>, + Richard Bown <[email protected]> + + The moral rights of Guillaume Laurent, Chris Cannam, and Richard + Bown to claim authorship of this work have been asserted. + + Other copyrights also apply to some parts of this work. Please + see the AUTHORS file and individual file headers for details. + + 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. See the file + COPYING included with this distribution for more information. +*/ + + +#include "RosegardenScrollView.h" + +#include "misc/Debug.h" +#include <qapplication.h> +#include <qcursor.h> +#include <qpoint.h> +#include <qrect.h> +#include <qscrollbar.h> +#include <qscrollview.h> +#include <qsizepolicy.h> +#include <qtimer.h> +#include <qwidget.h> + + +namespace Rosegarden +{ + +// Smooth scroll checks +// + +const int RosegardenScrollView::AutoscrollMargin = 16; +const int RosegardenScrollView::InitialScrollTime = 30; +const int RosegardenScrollView::InitialScrollAccel = 5; +const int RosegardenScrollView::MaxScrollDelta = 100; // max a.scroll speed +const double RosegardenScrollView::ScrollAccelValue = 1.04;// acceleration rate + +RosegardenScrollView::RosegardenScrollView(QWidget* parent, + const char* name, WFlags f) + : QScrollView(parent, name, f), + m_bottomWidget(0), + m_currentBottomWidgetHeight( -1), + m_smoothScroll(true), + m_smoothScrollTimeInterval(DefaultSmoothScrollTimeInterval), + m_minDeltaScroll(DefaultMinDeltaScroll), + m_autoScrollTime(InitialScrollTime), + m_autoScrollAccel(InitialScrollAccel), + m_autoScrollXMargin(0), + m_autoScrollYMargin(0), + m_currentScrollDirection(None), + m_scrollDirectionConstraint(NoFollow), + m_autoScrolling(false) +{ + setDragAutoScroll(true); + connect( &m_autoScrollTimer, SIGNAL( timeout() ), + this, SLOT( doAutoScroll() ) ); +} + +void RosegardenScrollView::setBottomFixedWidget(QWidget* w) +{ + m_bottomWidget = w; + if (m_bottomWidget) { + m_bottomWidget->reparent(this, 0, QPoint(0, 0)); + m_bottomWidget->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed)); + setMargins(0, 0, 0, m_bottomWidget->sizeHint().height()); + } +} + +void RosegardenScrollView::startAutoScroll() +{ + // RG_DEBUG << "RosegardenScrollView::startAutoScroll()\n"; + + if ( !m_autoScrollTimer.isActive() ) { + m_autoScrollTime = InitialScrollTime; + m_autoScrollAccel = InitialScrollAccel; + m_autoScrollTimer.start( m_autoScrollTime ); + } + + QPoint autoScrollStartPoint = viewport()->mapFromGlobal( QCursor::pos() ); + m_autoScrollYMargin = autoScrollStartPoint.y() / 10; + m_autoScrollXMargin = autoScrollStartPoint.x() / 10; + + m_autoScrolling = true; +} + +void RosegardenScrollView::startAutoScroll(int directionConstraint) +{ + setScrollDirectionConstraint(directionConstraint); + startAutoScroll(); +} + +void RosegardenScrollView::stopAutoScroll() +{ + // RG_DEBUG << "RosegardenScrollView::stopAutoScroll()\n"; + + m_autoScrollTimer.stop(); + m_minDeltaScroll = DefaultMinDeltaScroll; + m_currentScrollDirection = None; + + m_autoScrolling = false; +} + +void RosegardenScrollView::doAutoScroll() +{ + // RG_DEBUG << "RosegardenScrollView::doAutoScroll()\n"; + + QPoint p = viewport()->mapFromGlobal( QCursor::pos() ); + QPoint dp = p - m_previousP; + m_previousP = p; + + m_autoScrollTimer.start( m_autoScrollTime ); + ScrollDirection scrollDirection = None; + + int dx = 0, dy = 0; + if (m_scrollDirectionConstraint & FollowVertical) { + if ( p.y() < m_autoScrollYMargin ) { + dy = -(int(m_minDeltaScroll)); + scrollDirection = Top; + } else if ( p.y() > visibleHeight() - m_autoScrollYMargin ) { + dy = + (int(m_minDeltaScroll)); + scrollDirection = Bottom; + } + } + bool startDecelerating = false; + if (m_scrollDirectionConstraint & FollowHorizontal) { + + // RG_DEBUG << "p.x() : " << p.x() << " - visibleWidth : " << visibleWidth() << " - autoScrollXMargin : " << m_autoScrollXMargin << endl; + + if ( p.x() < m_autoScrollXMargin ) { + if ( dp.x() > 0 ) { + startDecelerating = true; + m_minDeltaScroll /= ScrollAccelValue; + } + dx = -(int(m_minDeltaScroll)); + scrollDirection = Left; + } else if ( p.x() > visibleWidth() - m_autoScrollXMargin ) { + if ( dp.x() < 0 ) { + startDecelerating = true; + m_minDeltaScroll /= ScrollAccelValue; + } + dx = + (int(m_minDeltaScroll)); + scrollDirection = Right; + } + } + + // RG_DEBUG << "dx: " << dx << ", dy: " << dy << endl; + + if ( (dx || dy) && + ((scrollDirection == m_currentScrollDirection) || (m_currentScrollDirection == None)) ) { + scrollBy(dx, dy); + if ( startDecelerating ) + m_minDeltaScroll /= ScrollAccelValue; + else + m_minDeltaScroll *= ScrollAccelValue; + if (m_minDeltaScroll > MaxScrollDelta ) + m_minDeltaScroll = MaxScrollDelta; + m_currentScrollDirection = scrollDirection; + + } else { + // Don't automatically stopAutoScroll() here, the mouse button + // is presumably still pressed. + m_minDeltaScroll = DefaultMinDeltaScroll; + m_currentScrollDirection = None; + } + +} + +const int RosegardenScrollView::DefaultSmoothScrollTimeInterval = 10; +const double RosegardenScrollView::DefaultMinDeltaScroll = 1.2; + +bool RosegardenScrollView::isTimeForSmoothScroll() +{ + static int desktopWidth = QApplication::desktop()->width(), + desktopHeight = QApplication::desktop()->height(); + + if (m_smoothScroll) { + int ta = m_scrollAccelerationTimer.elapsed(); + int t = m_scrollTimer.elapsed(); + + RG_DEBUG << "t = " << t << ", ta = " << ta << ", int " << m_smoothScrollTimeInterval << ", delta " << m_minDeltaScroll << endl; + + if (t < m_smoothScrollTimeInterval) { + + return false; + + } else { + + if (ta > 300) { + // reset smoothScrollTimeInterval + m_smoothScrollTimeInterval = DefaultSmoothScrollTimeInterval; + m_minDeltaScroll = DefaultMinDeltaScroll; + m_scrollAccelerationTimer.restart(); + } else if (ta > 50) { + // m_smoothScrollTimeInterval /= 2; + m_minDeltaScroll *= 1.08; + m_scrollAccelerationTimer.restart(); + } + + m_scrollTimer.restart(); + return true; + } + } + + return true; +} + +void RosegardenScrollView::slotScrollHoriz(int hpos) +{ + QScrollBar* hbar = getMainHorizontalScrollBar(); + int currentContentYPos = contentsY(); + + /* Lots of performance hitting debug + RG_DEBUG << "RosegardenCanvasView::slotScrollHoriz: hpos is " << hpos + << ", contentsX is " << contentsX() << ", visibleWidth is " + << visibleWidth() << endl; + */ + + if (hpos == 0) { + + // returning to zero + // hbar->setValue(0); + setContentsPos(0, currentContentYPos); + + } else if (hpos > (contentsX() + + visibleWidth() * 1.6) || + hpos < (contentsX() - + visibleWidth() * 0.7)) { + + // miles off one side or the other + // hbar->setValue(hpos - int(visibleWidth() * 0.4)); + setContentsPos(hpos - int(visibleWidth() * 0.4), currentContentYPos); + + } else if (hpos > (contentsX() + + visibleWidth() * 0.9)) { + + // moving off the right hand side of the view + // hbar->setValue(hbar->value() + int(visibleWidth() * 0.6)); + setContentsPos(hbar->value() + int(visibleWidth() * 0.6), currentContentYPos); + + } else if (hpos < (contentsX() + + visibleWidth() * 0.1)) { + + // moving off the left + // hbar->setValue(hbar->value() - int(visibleWidth() * 0.6)); + setContentsPos(hbar->value() - int(visibleWidth() * 0.6), currentContentYPos); + } +} + +void RosegardenScrollView::slotScrollHorizSmallSteps(int hpos) +{ + QScrollBar* hbar = getMainHorizontalScrollBar(); + int currentContentYPos = contentsY(); + + int diff = 0; + + if (hpos == 0) { + + // returning to zero + // hbar->setValue(0); + setContentsPos(0, currentContentYPos); + + } else if ((diff = int(hpos - (contentsX() + + visibleWidth() * 0.90))) > 0) { + + // moving off the right hand side of the view + + int delta = diff / 6; + int diff10 = std::min(diff, (int)m_minDeltaScroll); + delta = std::max(delta, diff10); + + // hbar->setValue(hbar->value() + delta); + setContentsPos(hbar->value() + delta, currentContentYPos); + + } else if ((diff = int(hpos - (contentsX() + + visibleWidth() * 0.10))) < 0) { + // moving off the left + + int delta = -diff / 6; + int diff10 = std::min( -diff, (int)m_minDeltaScroll); + delta = std::max(delta, diff10); + + // hbar->setValue(hbar->value() - delta); + setContentsPos(hbar->value() - delta, currentContentYPos); + + } +} + +void RosegardenScrollView::slotScrollVertSmallSteps(int vpos) +{ + QScrollBar* vbar = verticalScrollBar(); + + // RG_DEBUG << "RosegardenCanvasView::slotScrollVertSmallSteps: vpos is " << vpos << ", contentsY is " << contentsY() << ", visibleHeight is " << visibleHeight() << endl; + + // As a special case (or hack), ignore any request made before we've + // actually been rendered and sized + if (visibleHeight() <= 1) + return ; + + int diff = 0; + + if (vpos == 0) { + + // returning to zero + vbar->setValue(0); + + } else if ((diff = int(vpos - (contentsY() + + visibleHeight() * 0.90))) > 0) { + + // moving off up + + int delta = diff / 6; + int diff10 = std::min(diff, (int)m_minDeltaScroll); + delta = std::max(delta, diff10); + + vbar->setValue(vbar->value() + diff); + + } else if ((diff = int(vpos - (contentsY() + + visibleHeight() * 0.10))) < 0) { + + // moving off down + + int delta = -diff / 6; + int diff10 = std::min( -diff, (int)m_minDeltaScroll); + delta = std::max(delta, diff10); + + vbar->setValue(vbar->value() - delta); + + } +} + +void RosegardenScrollView::slotScrollVertToTop(int vpos) +{ + QScrollBar* vbar = verticalScrollBar(); + if (vpos < visibleHeight() / 3) + vbar->setValue(0); + else + vbar->setValue(vpos - visibleHeight() / 5); +} + +void RosegardenScrollView::slotSetScrollPos(const QPoint &pos) +{ + horizontalScrollBar()->setValue(pos.x()); + verticalScrollBar()->setValue(pos.y()); +} + +void RosegardenScrollView::resizeEvent(QResizeEvent* e) +{ + QScrollView::resizeEvent(e); + if (!horizontalScrollBar()->isVisible()) + updateBottomWidgetGeometry(); + +} + +void RosegardenScrollView::setHBarGeometry(QScrollBar &hbar, int x, int y, int w, int h) +{ + QScrollView::setHBarGeometry(hbar, x, y, w, h); + updateBottomWidgetGeometry(); +} + +void RosegardenScrollView::updateBottomWidgetGeometry() +{ + if (!m_bottomWidget) + return ; + + int bottomWidgetHeight = m_bottomWidget->sizeHint().height(); + + setMargins(0, 0, 0, bottomWidgetHeight); + QRect r = frameRect(); + int hScrollBarHeight = 0; + if (horizontalScrollBar()->isVisible()) + hScrollBarHeight = horizontalScrollBar()->height() + 2; // + 2 offset needed to preserve border shadow + + int vScrollBarWidth = 0; + if (verticalScrollBar()->isVisible()) + vScrollBarWidth = verticalScrollBar()->width(); + + m_bottomWidget->setGeometry(r.x(), + r.y() + r.height() - bottomWidgetHeight - hScrollBarHeight, + r.width() - vScrollBarWidth, + bottomWidgetHeight); + + if (bottomWidgetHeight != m_currentBottomWidgetHeight) { + emit bottomWidgetHeightChanged(bottomWidgetHeight); + m_currentBottomWidgetHeight = bottomWidgetHeight; + } + +} + +void RosegardenScrollView::wheelEvent(QWheelEvent *e) +{ + if (e->state() & ControlButton) { + if (e->delta() > 0) + emit zoomIn(); + else if (e->delta() < 0) + emit zoomOut(); + return ; + } + QScrollView::wheelEvent(e); +} + +} +#include "RosegardenScrollView.moc" |