#include "kitemlistcontainer.h"
#include "kitemlistcontroller.h"
+#include "kitemlistsmoothscroller_p.h"
#include "kitemlistview.h"
#include "kitemmodelbase.h"
+#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
+#include <QPropertyAnimation>
#include <QScrollBar>
#include <QStyle>
#include <KDebug>
+/**
+ * Replaces the default viewport of KItemListContainer by a
+ * non-scrollable viewport. The scrolling is done in an optimized
+ * way by KItemListView internally.
+ */
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.
- }
+ KItemListContainerViewport(QGraphicsScene* scene, QWidget* parent);
+protected:
+ virtual void wheelEvent(QWheelEvent* event);
};
+KItemListContainerViewport::KItemListContainerViewport(QGraphicsScene* scene, QWidget* parent) :
+ QGraphicsView(scene, parent)
+{
+ setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+ setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+ setViewportMargins(0, 0, 0, 0);
+ setFrameShape(QFrame::NoFrame);
+}
+
+void KItemListContainerViewport::wheelEvent(QWheelEvent* event)
+{
+ // Assure that the wheel-event gets forwarded to the parent
+ // and not handled at all by QGraphicsView.
+ event->ignore();
+}
+
+
+
KItemListContainer::KItemListContainer(KItemListController* controller, QWidget* parent) :
QAbstractScrollArea(parent),
- m_controller(controller)
+ m_controller(controller),
+ m_horizontalSmoothScroller(0),
+ m_verticalSmoothScroller(0)
{
Q_ASSERT(controller);
controller->setParent(this);
KItemListContainer::KItemListContainer(QWidget* parent) :
QAbstractScrollArea(parent),
- m_controller(0)
+ m_controller(0),
+ m_horizontalSmoothScroller(0),
+ m_verticalSmoothScroller(0)
{
initialize();
}
return m_controller;
}
+void KItemListContainer::keyPressEvent(QKeyEvent* event)
+{
+ // TODO: We should find a better way to handle the key press events in the view.
+ // The reasons why we need this hack are:
+ // 1. Without reimplementing keyPressEvent() here, the event would not reach the QGraphicsView.
+ // 2. By default, the KItemListView does not have the keyboard focus in the QGraphicsScene, so
+ // simply sending the event to the QGraphicsView which is the KItemListContainer's viewport
+ // does not work.
+ KItemListView* view = m_controller->view();
+ if (view) {
+ QApplication::sendEvent(view, event);
+ }
+}
+
void KItemListContainer::showEvent(QShowEvent* event)
{
QAbstractScrollArea::showEvent(event);
void KItemListContainer::scrollContentsBy(int dx, int dy)
{
+ m_horizontalSmoothScroller->scrollContentsBy(dx);
+ m_verticalSmoothScroller->scrollContentsBy(dy);
+}
+
+void KItemListContainer::wheelEvent(QWheelEvent* event)
+{
+ if (event->modifiers().testFlag(Qt::ControlModifier)) {
+ event->ignore();
+ return;
+ }
+
KItemListView* view = m_controller->view();
if (!view) {
+ event->ignore();
return;
}
- const qreal currentOffset = view->offset();
- const qreal offsetDiff = (view->scrollOrientation() == Qt::Vertical) ? dy : dx;
- view->setOffset(currentOffset - offsetDiff);
+ const bool scrollHorizontally = (event->orientation() == Qt::Horizontal) ||
+ (event->orientation() == Qt::Vertical && !verticalScrollBar()->isVisible());
+ KItemListSmoothScroller* smoothScroller = scrollHorizontally ?
+ m_horizontalSmoothScroller : m_verticalSmoothScroller;
+
+ const int numDegrees = event->delta() / 8;
+ const int numSteps = numDegrees / 15;
+
+ const QScrollBar* scrollBar = smoothScroller->scrollBar();
+ smoothScroller->scrollTo(scrollBar->value() - numSteps * scrollBar->pageStep());
+
+ event->accept();
+}
+
+void KItemListContainer::slotScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
+{
+ Q_UNUSED(previous);
+ updateSmoothScrollers(current);
}
void KItemListContainer::slotModelChanged(KItemModelBase* current, KItemModelBase* 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()));
+ disconnect(current, SIGNAL(scrollOrientationChanged(Qt::Orientation,Qt::Orientation)), this, SLOT(slotScrollOrientationChanged(Qt::Orientation,Qt::Orientation)));
+ disconnect(previous, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(updateScrollOffsetScrollBar()));
+ disconnect(previous, SIGNAL(maximumScrollOffsetChanged(qreal,qreal)), this, SLOT(updateScrollOffsetScrollBar()));
+ disconnect(previous, SIGNAL(itemOffsetChanged(qreal,qreal)), this, SLOT(updateItemOffsetScrollBar()));
+ disconnect(previous, SIGNAL(maximumItemOffsetChanged(qreal,qreal)), this, SLOT(updateItemOffsetScrollBar()));
+ disconnect(previous, SIGNAL(scrollTo(qreal)), this, SLOT(scrollTo(qreal)));
+ m_horizontalSmoothScroller->setTargetObject(0);
+ m_verticalSmoothScroller->setTargetObject(0);
}
if (current) {
scene->addItem(current);
- connect(previous, SIGNAL(offsetChanged(int,int)), this, SLOT(updateScrollBars()));
- connect(current, SIGNAL(maximumOffsetChanged(int,int)), this, SLOT(updateScrollBars()));
+ connect(current, SIGNAL(scrollOrientationChanged(Qt::Orientation,Qt::Orientation)), this, SLOT(slotScrollOrientationChanged(Qt::Orientation,Qt::Orientation)));
+ connect(current, SIGNAL(scrollOffsetChanged(qreal,qreal)), this, SLOT(updateScrollOffsetScrollBar()));
+ connect(current, SIGNAL(maximumScrollOffsetChanged(qreal,qreal)), this, SLOT(updateScrollOffsetScrollBar()));
+ connect(current, SIGNAL(itemOffsetChanged(qreal,qreal)), this, SLOT(updateItemOffsetScrollBar()));
+ connect(current, SIGNAL(maximumItemOffsetChanged(qreal,qreal)), this, SLOT(updateItemOffsetScrollBar()));
+ connect(current, SIGNAL(scrollTo(qreal)), this, SLOT(scrollTo(qreal)));
+ m_horizontalSmoothScroller->setTargetObject(current);
+ m_verticalSmoothScroller->setTargetObject(current);
+ updateSmoothScrollers(current->scrollOrientation());
}
}
-void KItemListContainer::updateScrollBars()
+void KItemListContainer::scrollTo(qreal offset)
{
- const QSizeF size = m_controller->view()->size();
+ const KItemListView* view = m_controller->view();
+ if (view) {
+ if (view->scrollOrientation() == Qt::Vertical) {
+ m_verticalSmoothScroller->scrollTo(offset);
+ } else {
+ m_horizontalSmoothScroller->scrollTo(offset);
+ }
+ }
+}
+
+void KItemListContainer::updateScrollOffsetScrollBar()
+{
+ const KItemListView* view = m_controller->view();
+ if (!view) {
+ return;
+ }
- 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);
+ KItemListSmoothScroller* smoothScroller = 0;
+ QScrollBar* scrollOffsetScrollBar = 0;
+ int singleStep = 0;
+ int pageStep = 0;
+ if (view->scrollOrientation() == Qt::Vertical) {
+ smoothScroller = m_verticalSmoothScroller;
+ scrollOffsetScrollBar = verticalScrollBar();
+ singleStep = view->itemSize().height();
+ pageStep = view->size().height();
} 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);
+ smoothScroller = m_horizontalSmoothScroller;
+ scrollOffsetScrollBar = horizontalScrollBar();
+ singleStep = view->itemSize().width();
+ pageStep = view->size().width();
+ }
+
+ const int value = view->scrollOffset();
+ const int maximum = qMax(0, int(view->maximumScrollOffset() - pageStep));
+ if (smoothScroller->requestScrollBarUpdate(maximum)) {
+ scrollOffsetScrollBar->setSingleStep(singleStep);
+ scrollOffsetScrollBar->setPageStep(pageStep);
+ scrollOffsetScrollBar->setMinimum(0);
+ scrollOffsetScrollBar->setMaximum(maximum);
+ scrollOffsetScrollBar->setValue(value);
}
}
-void KItemListContainer::updateGeometries()
+void KItemListContainer::updateItemOffsetScrollBar()
{
- QRect rect = geometry();
+ const KItemListView* view = m_controller->view();
+ if (!view) {
+ return;
+ }
- int widthDec = frameWidth() * 2;
- if (verticalScrollBar()->isVisible()) {
- widthDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent);
+ KItemListSmoothScroller* smoothScroller = 0;
+ QScrollBar* itemOffsetScrollBar = 0;
+ int singleStep = 0;
+ int pageStep = 0;
+ if (view->scrollOrientation() == Qt::Vertical) {
+ smoothScroller = m_horizontalSmoothScroller;
+ itemOffsetScrollBar = horizontalScrollBar();
+ singleStep = view->size().width() / 10;
+ pageStep = view->size().width();
+ } else {
+ smoothScroller = m_verticalSmoothScroller;
+ itemOffsetScrollBar = verticalScrollBar();
+ singleStep = view->size().height() / 10;
+ pageStep = view->size().height();
}
- int heightDec = frameWidth() * 2;
- if (horizontalScrollBar()->isVisible()) {
- heightDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent);
+ const int value = view->itemOffset();
+ const int maximum = qMax(0, int(view->maximumItemOffset()) - pageStep);
+ if (smoothScroller->requestScrollBarUpdate(maximum)) {
+ itemOffsetScrollBar->setSingleStep(singleStep);
+ itemOffsetScrollBar->setPageStep(pageStep);
+ itemOffsetScrollBar->setMinimum(0);
+ itemOffsetScrollBar->setMaximum(maximum);
+ itemOffsetScrollBar->setValue(value);
}
+}
+
+void KItemListContainer::updateGeometries()
+{
+ QRect rect = geometry();
+
+ const int widthDec = verticalScrollBar()->isVisible()
+ ? frameWidth() + style()->pixelMetric(QStyle::PM_ScrollBarExtent)
+ : frameWidth() * 2;
+
+ const int heightDec = horizontalScrollBar()->isVisible()
+ ? frameWidth() + style()->pixelMetric(QStyle::PM_ScrollBarExtent)
+ : frameWidth() * 2;
rect.adjust(0, 0, -widthDec, -heightDec);
- m_controller->view()->setGeometry(QRect(0, 0, rect.width(), rect.height()));
+ const QRectF newGeometry(0, 0, rect.width(), rect.height());
+ if (m_controller->view()->geometry() != newGeometry) {
+ m_controller->view()->setGeometry(newGeometry);
- 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()));
+ 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();
+ updateScrollOffsetScrollBar();
+ updateItemOffsetScrollBar();
+ }
+}
+
+void KItemListContainer::updateSmoothScrollers(Qt::Orientation orientation)
+{
+ if (orientation == Qt::Vertical) {
+ m_verticalSmoothScroller->setPropertyName("scrollOffset");
+ m_horizontalSmoothScroller->setPropertyName("itemOffset");
+ } else {
+ m_horizontalSmoothScroller->setPropertyName("scrollOffset");
+ m_verticalSmoothScroller->setPropertyName("itemOffset");
+ }
}
void KItemListContainer::initialize()
QGraphicsView* graphicsView = new KItemListContainerViewport(new QGraphicsScene(this), this);
setViewport(graphicsView);
+
+ m_horizontalSmoothScroller = new KItemListSmoothScroller(horizontalScrollBar(), this);
+ m_verticalSmoothScroller = new KItemListSmoothScroller(verticalScrollBar(), this);
}
#include "kitemlistcontainer.moc"
projects / dolphin.git / blobdiff