#include "kitemlistview.h"
#include "kitemmodelbase.h"
+#include "private/kitemlistsmoothscroller.h"
+
+#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QScrollBar>
#include <QStyle>
+#include <QStyleOption>
-#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);
- }
+ Q_OBJECT
- 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.
- }
+public:
+ 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);
- initialize();
-}
-KItemListContainer::KItemListContainer(QWidget* parent) :
- QAbstractScrollArea(parent),
- m_controller(0)
-{
- initialize();
+ QGraphicsView* graphicsView = new KItemListContainerViewport(new QGraphicsScene(this), this);
+ setViewport(graphicsView);
+
+ m_horizontalSmoothScroller = new KItemListSmoothScroller(horizontalScrollBar(), this);
+ m_verticalSmoothScroller = new KItemListSmoothScroller(verticalScrollBar(), this);
+
+ if (controller->model()) {
+ slotModelChanged(controller->model(), 0);
+ }
+ if (controller->view()) {
+ slotViewChanged(controller->view(), 0);
+ }
+
+ connect(controller, &KItemListController::modelChanged,
+ this, &KItemListContainer::slotModelChanged);
+ connect(controller, &KItemListController::viewChanged,
+ this, &KItemListContainer::slotViewChanged);
}
KItemListContainer::~KItemListContainer()
{
+ // Don't rely on the QObject-order to delete the controller, otherwise
+ // the QGraphicsScene might get deleted before the view.
+ delete m_controller;
+ m_controller = 0;
}
KItemListController* KItemListContainer::controller() const
return m_controller;
}
+void KItemListContainer::setEnabledFrame(bool enable)
+{
+ QGraphicsView* graphicsView = qobject_cast<QGraphicsView*>(viewport());
+ if (enable) {
+ setFrameShape(QFrame::StyledPanel);
+ graphicsView->setPalette(palette());
+ graphicsView->viewport()->setAutoFillBackground(true);
+ } else {
+ setFrameShape(QFrame::NoFrame);
+ // Make the background of the container transparent and apply the window-text color
+ // to the text color, so that enough contrast is given for all color
+ // schemes
+ QPalette p = graphicsView->palette();
+ p.setColor(QPalette::Active, QPalette::Text, p.color(QPalette::Active, QPalette::WindowText));
+ p.setColor(QPalette::Inactive, QPalette::Text, p.color(QPalette::Inactive, QPalette::WindowText));
+ p.setColor(QPalette::Disabled, QPalette::Text, p.color(QPalette::Disabled, QPalette::WindowText));
+ graphicsView->setPalette(p);
+ graphicsView->viewport()->setAutoFillBackground(false);
+ }
+}
+
+bool KItemListContainer::enabledFrame() const
+{
+ const QGraphicsView* graphicsView = qobject_cast<QGraphicsView*>(viewport());
+ return graphicsView->autoFillBackground();
+}
+
+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 QScrollBar* scrollBar = smoothScroller->scrollBar();
+ if (!event->pixelDelta().isNull()) {
+ const int numPixels = event->pixelDelta().y();
+ if (event->modifiers().testFlag(Qt::ShiftModifier)) {
+ const int scrollingDirection = numPixels > 0 ? 1 : -1;
+ smoothScroller->scrollTo(scrollBar->value() - scrollBar->pageStep() * scrollingDirection);
+ } else {
+ smoothScroller->scrollTo(scrollBar->value() - numPixels);
+ }
+ } else {
+ const int numDegrees = event->angleDelta().y() / 8;
+ const int numSteps = qApp->wheelScrollLines() * numDegrees / 15;
+ if (event->modifiers().testFlag(Qt::ShiftModifier)) {
+ const int scrollingDirection = numSteps > 0 ? 1 : -1;
+ smoothScroller->scrollTo(scrollBar->value() - scrollBar->pageStep() * scrollingDirection);
+ } else {
+ smoothScroller->scrollTo(scrollBar->value() - numSteps * scrollBar->pageStep() / 12);
+ }
+ }
+
+ 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(previous, &KItemListView::scrollOrientationChanged,
+ this, &KItemListContainer::slotScrollOrientationChanged);
+ disconnect(previous, &KItemListView::scrollOffsetChanged,
+ this, &KItemListContainer::updateScrollOffsetScrollBar);
+ disconnect(previous, &KItemListView::maximumScrollOffsetChanged,
+ this, &KItemListContainer::updateScrollOffsetScrollBar);
+ disconnect(previous, &KItemListView::itemOffsetChanged,
+ this, &KItemListContainer::updateItemOffsetScrollBar);
+ disconnect(previous, &KItemListView::maximumItemOffsetChanged,
+ this, &KItemListContainer::updateItemOffsetScrollBar);
+ disconnect(previous, &KItemListView::scrollTo, this, &KItemListContainer::scrollTo);
+ 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, &KItemListView::scrollOrientationChanged,
+ this, &KItemListContainer::slotScrollOrientationChanged);
+ connect(current, &KItemListView::scrollOffsetChanged,
+ this, &KItemListContainer::updateScrollOffsetScrollBar);
+ connect(current, &KItemListView::maximumScrollOffsetChanged,
+ this, &KItemListContainer::updateScrollOffsetScrollBar);
+ connect(current, &KItemListView::itemOffsetChanged,
+ this, &KItemListContainer::updateItemOffsetScrollBar);
+ connect(current, &KItemListView::maximumItemOffsetChanged,
+ this, &KItemListContainer::updateItemOffsetScrollBar);
+ connect(current, &KItemListView::scrollTo, this, &KItemListContainer::scrollTo);
+ m_horizontalSmoothScroller->setTargetObject(current);
+ m_verticalSmoothScroller->setTargetObject(current);
+ updateSmoothScrollers(current->scrollOrientation());
+ }
+}
+
+void KItemListContainer::scrollTo(qreal offset)
+{
+ const KItemListView* view = m_controller->view();
+ if (view) {
+ if (view->scrollOrientation() == Qt::Vertical) {
+ m_verticalSmoothScroller->scrollTo(offset);
+ } else {
+ m_horizontalSmoothScroller->scrollTo(offset);
+ }
}
}
-void KItemListContainer::updateScrollBars()
+void KItemListContainer::updateScrollOffsetScrollBar()
{
- const QSizeF size = m_controller->view()->size();
+ 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;
+ int maximum = 0;
+ if (view->scrollOrientation() == Qt::Vertical) {
+ smoothScroller = m_verticalSmoothScroller;
+ scrollOffsetScrollBar = verticalScrollBar();
+ singleStep = view->itemSize().height();
+ // We cannot use view->size().height() because this height might
+ // include the header widget, which is not part of the scrolled area.
+ pageStep = view->verticalPageStep();
+
+ // However, the total height of the view must be considered for the
+ // maximum value of the scroll bar. Note that the view's scrollOffset()
+ // refers to the offset of the top part of the view, which might be
+ // hidden behind the header.
+ maximum = qMax(0, int(view->maximumScrollOffset() - 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();
+ maximum = qMax(0, int(view->maximumScrollOffset() - view->size().width()));
+ }
+
+ const int value = view->scrollOffset();
+ if (smoothScroller->requestScrollBarUpdate(maximum)) {
+ const bool updatePolicy = (scrollOffsetScrollBar->maximum() > 0 && maximum == 0)
+ || horizontalScrollBarPolicy() == Qt::ScrollBarAlwaysOn;
+
+ scrollOffsetScrollBar->setSingleStep(singleStep);
+ scrollOffsetScrollBar->setPageStep(pageStep);
+ scrollOffsetScrollBar->setMinimum(0);
+ scrollOffsetScrollBar->setMaximum(maximum);
+ scrollOffsetScrollBar->setValue(value);
+
+ if (updatePolicy) {
+ // Prevent a potential endless layout loop (see bug #293318).
+ updateScrollOffsetScrollBarPolicy();
+ }
+ }
+}
+
+void KItemListContainer::updateItemOffsetScrollBar()
+{
+ const KItemListView* view = m_controller->view();
+ if (!view) {
+ return;
+ }
+
+ 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();
+ }
+
+ 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);
}
}
{
QRect rect = geometry();
- int widthDec = frameWidth() * 2;
- if (verticalScrollBar()->isVisible()) {
- widthDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent);
+ int extra = frameWidth() * 2;
+ QStyleOption option;
+ option.initFrom(this);
+ int scrollbarSpacing = 0;
+ if (style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, &option, this)) {
+ scrollbarSpacing = style()->pixelMetric(QStyle::PM_ScrollView_ScrollBarSpacing, &option, this);
}
- int heightDec = frameWidth() * 2;
- if (horizontalScrollBar()->isVisible()) {
- heightDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent);
- }
+ const int widthDec = verticalScrollBar()->isVisible()
+ ? extra + scrollbarSpacing + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
+ : extra;
- rect.adjust(0, 0, -widthDec, -heightDec);
+ const int heightDec = horizontalScrollBar()->isVisible()
+ ? extra + scrollbarSpacing + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this)
+ : extra;
- m_controller->view()->setGeometry(QRect(0, 0, rect.width(), rect.height()));
+ const QRectF newGeometry(0, 0, rect.width() - widthDec,
+ rect.height() - heightDec);
+ 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()));
+ // Get the real geometry of the view again since the scrollbars
+ // visibilities and the view geometry may have changed in re-layout.
+ static_cast<KItemListContainerViewport*>(viewport())->scene()->setSceneRect(m_controller->view()->geometry());
+ static_cast<KItemListContainerViewport*>(viewport())->viewport()->setGeometry(m_controller->view()->geometry().toRect());
- updateScrollBars();
+ updateScrollOffsetScrollBar();
+ updateItemOffsetScrollBar();
+ }
}
-void KItemListContainer::initialize()
+void KItemListContainer::updateSmoothScrollers(Qt::Orientation orientation)
{
- if (!m_controller) {
- m_controller = new KItemListController(this);
+ if (orientation == Qt::Vertical) {
+ m_verticalSmoothScroller->setPropertyName("scrollOffset");
+ m_horizontalSmoothScroller->setPropertyName("itemOffset");
+ } else {
+ m_horizontalSmoothScroller->setPropertyName("scrollOffset");
+ m_verticalSmoothScroller->setPropertyName("itemOffset");
}
+}
- connect(m_controller, SIGNAL(modelChanged(KItemModelBase*,KItemModelBase*)),
- this, SLOT(slotModelChanged(KItemModelBase*,KItemModelBase*)));
- connect(m_controller, SIGNAL(viewChanged(KItemListView*,KItemListView*)),
- this, SLOT(slotViewChanged(KItemListView*,KItemListView*)));
+void KItemListContainer::updateScrollOffsetScrollBarPolicy()
+{
+ const KItemListView* view = m_controller->view();
+ Q_ASSERT(view);
+ const bool vertical = (view->scrollOrientation() == Qt::Vertical);
- QGraphicsView* graphicsView = new KItemListContainerViewport(new QGraphicsScene(this), this);
- setViewport(graphicsView);
+ QStyleOption option;
+ option.initFrom(this);
+ const int scrollBarInc = style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this);
+
+ QSizeF newViewSize = m_controller->view()->size();
+ if (vertical) {
+ newViewSize.rwidth() += scrollBarInc;
+ } else {
+ newViewSize.rheight() += scrollBarInc;
+ }
+
+ const Qt::ScrollBarPolicy policy = view->scrollBarRequired(newViewSize)
+ ? Qt::ScrollBarAlwaysOn : Qt::ScrollBarAsNeeded;
+ if (vertical) {
+ setVerticalScrollBarPolicy(policy);
+ } else {
+ setHorizontalScrollBarPolicy(policy);
+ }
}
#include "kitemlistcontainer.moc"
projects / dolphin.git / blobdiff