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Diffstat (limited to 'src/kitemviews/kitemlistcontainer.cpp')
| -rw-r--r-- | src/kitemviews/kitemlistcontainer.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/kitemviews/kitemlistcontainer.cpp b/src/kitemviews/kitemlistcontainer.cpp new file mode 100644 index 000000000..09fb505d6 --- /dev/null +++ b/src/kitemviews/kitemlistcontainer.cpp @@ -0,0 +1,191 @@ +/*************************************************************************** + * Copyright (C) 2011 by Peter Penz <[email protected]> * + * * + * Based on the Itemviews NG project from Trolltech Labs: * + * http://qt.gitorious.org/qt-labs/itemviews-ng * + * * + * 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 * + ***************************************************************************/ + +#include "kitemlistcontainer.h" + +#include "kitemlistcontroller.h" +#include "kitemlistview.h" +#include "kitemmodelbase.h" + +#include <QGraphicsScene> +#include <QGraphicsView> +#include <QScrollBar> +#include <QStyle> + +#include <KDebug> + +class KItemListContainerViewport : public QGraphicsView +{ +public: + KItemListContainerViewport(QGraphicsScene* scene, QWidget* parent) + : QGraphicsView(scene, parent) + { + setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); + setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); + setViewportMargins(0, 0, 0, 0); + setFrameShape(QFrame::NoFrame); + } + + void scrollContentsBy(int dx, int dy) + { + Q_UNUSED(dx); + Q_UNUSED(dy); + // Do nothing. This prevents that e.g. the wheel-event + // results in a moving of the scene items. + } +}; + +KItemListContainer::KItemListContainer(KItemListController* controller, QWidget* parent) : + QAbstractScrollArea(parent), + m_controller(controller) +{ + Q_ASSERT(controller); + controller->setParent(this); + initialize(); +} + +KItemListContainer::KItemListContainer(QWidget* parent) : + QAbstractScrollArea(parent), + m_controller(0) +{ + initialize(); +} + +KItemListContainer::~KItemListContainer() +{ +} + +KItemListController* KItemListContainer::controller() const +{ + return m_controller; +} + +void KItemListContainer::showEvent(QShowEvent* event) +{ + QAbstractScrollArea::showEvent(event); + updateGeometries(); +} + +void KItemListContainer::resizeEvent(QResizeEvent* event) +{ + QAbstractScrollArea::resizeEvent(event); + updateGeometries(); +} + +void KItemListContainer::scrollContentsBy(int dx, int dy) +{ + KItemListView* view = m_controller->view(); + if (!view) { + return; + } + + const qreal currentOffset = view->offset(); + const qreal offsetDiff = (view->scrollOrientation() == Qt::Vertical) ? dy : dx; + view->setOffset(currentOffset - offsetDiff); +} + +void KItemListContainer::slotModelChanged(KItemModelBase* current, KItemModelBase* previous) +{ + Q_UNUSED(current); + Q_UNUSED(previous); +} + +void KItemListContainer::slotViewChanged(KItemListView* current, KItemListView* previous) +{ + QGraphicsScene* scene = static_cast<QGraphicsView*>(viewport())->scene(); + if (previous) { + scene->removeItem(previous); + disconnect(previous, SIGNAL(offsetChanged(int,int)), this, SLOT(updateScrollBars())); + disconnect(previous, SIGNAL(maximumOffsetChanged(int,int)), this, SLOT(updateScrollBars())); + } + if (current) { + scene->addItem(current); + connect(previous, SIGNAL(offsetChanged(int,int)), this, SLOT(updateScrollBars())); + connect(current, SIGNAL(maximumOffsetChanged(int,int)), this, SLOT(updateScrollBars())); + } +} + +void KItemListContainer::updateScrollBars() +{ + const QSizeF size = m_controller->view()->size(); + + if (m_controller->view()->scrollOrientation() == Qt::Vertical) { + QScrollBar* scrollBar = verticalScrollBar(); + const int value = m_controller->view()->offset(); + const int maximum = qMax(0, int(m_controller->view()->maximumOffset() - size.height())); + scrollBar->setPageStep(size.height()); + scrollBar->setMinimum(0); + scrollBar->setMaximum(maximum); + scrollBar->setValue(value); + horizontalScrollBar()->setMaximum(0); + } else { + QScrollBar* scrollBar = horizontalScrollBar(); + const int value = m_controller->view()->offset(); + const int maximum = qMax(0, int(m_controller->view()->maximumOffset() - size.width())); + scrollBar->setPageStep(size.width()); + scrollBar->setMinimum(0); + scrollBar->setMaximum(maximum); + scrollBar->setValue(value); + verticalScrollBar()->setMaximum(0); + } +} + +void KItemListContainer::updateGeometries() +{ + QRect rect = geometry(); + + int widthDec = frameWidth() * 2; + if (verticalScrollBar()->isVisible()) { + widthDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent); + } + + int heightDec = frameWidth() * 2; + if (horizontalScrollBar()->isVisible()) { + heightDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent); + } + + rect.adjust(0, 0, -widthDec, -heightDec); + + m_controller->view()->setGeometry(QRect(0, 0, rect.width(), rect.height())); + + static_cast<KItemListContainerViewport*>(viewport())->scene()->setSceneRect(0, 0, rect.width(), rect.height()); + static_cast<KItemListContainerViewport*>(viewport())->viewport()->setGeometry(QRect(0, 0, rect.width(), rect.height())); + + updateScrollBars(); +} + +void KItemListContainer::initialize() +{ + if (!m_controller) { + m_controller = new KItemListController(this); + } + + connect(m_controller, SIGNAL(modelChanged(KItemModelBase*,KItemModelBase*)), + this, SLOT(slotModelChanged(KItemModelBase*,KItemModelBase*))); + connect(m_controller, SIGNAL(viewChanged(KItemListView*,KItemListView*)), + this, SLOT(slotViewChanged(KItemListView*,KItemListView*))); + + QGraphicsView* graphicsView = new KItemListContainerViewport(new QGraphicsScene(this), this); + setViewport(graphicsView); +} + +#include "kitemlistcontainer.moc" |