X-Git-Url: https://cloud.milkyroute.net/gitweb/dolphin.git/blobdiff_plain/a14d8bf655917dcf806e22bdfafb03a35f5c8680..40c71d5ce0f6978ce48eb67fd73ed211bab4e887:/src/kitemviews/kitemlistcontainer.cpp diff --git a/src/kitemviews/kitemlistcontainer.cpp b/src/kitemviews/kitemlistcontainer.cpp index ec759bdb3..5a485b62c 100644 --- a/src/kitemviews/kitemlistcontainer.cpp +++ b/src/kitemviews/kitemlistcontainer.cpp @@ -26,42 +26,54 @@ #include "kitemlistview.h" #include "kitemmodelbase.h" +#include "private/kitemlistsmoothscroller.h" + #include #include #include #include #include #include +#include #include +/** + * 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_scrollBarPressed(false), - m_smoothScrolling(false), - m_smoothScrollingAnimation(0) + m_horizontalSmoothScroller(0), + m_verticalSmoothScroller(0) { Q_ASSERT(controller); controller->setParent(this); @@ -71,9 +83,8 @@ KItemListContainer::KItemListContainer(KItemListController* controller, QWidget* KItemListContainer::KItemListContainer(QWidget* parent) : QAbstractScrollArea(parent), m_controller(0), - m_scrollBarPressed(false), - m_smoothScrolling(false), - m_smoothScrollingAnimation(0) + m_horizontalSmoothScroller(0), + m_verticalSmoothScroller(0) { initialize(); } @@ -115,105 +126,43 @@ void KItemListContainer::resizeEvent(QResizeEvent* event) void KItemListContainer::scrollContentsBy(int dx, int dy) { - KItemListView* view = m_controller->view(); - if (!view) { - return; - } - - const qreal currentOffset = view->offset(); - qreal offsetDiff = (view->scrollOrientation() == Qt::Vertical) ? dy : dx; - - const bool animRunning = (m_smoothScrollingAnimation->state() == QAbstractAnimation::Running); - if (animRunning) { - // Stopping a running animation means skipping the range from the current offset - // until the target offset. To prevent skipping of the range the difference - // is added to the new target offset. - const qreal oldEndOffset = m_smoothScrollingAnimation->endValue().toReal(); - offsetDiff += (currentOffset - oldEndOffset); - } - - const qreal endOffset = currentOffset - offsetDiff; - - if (m_smoothScrolling || animRunning) { - qreal startOffset = currentOffset; - if (animRunning) { - // If the animation was running and has been interrupted by assigning a new end-offset - // one frame must be added to the start-offset to keep the animation smooth. This also - // assures that animation proceeds even in cases where new end-offset are triggered - // within a very short timeslots. - startOffset += (endOffset - currentOffset) * 1000 / (m_smoothScrollingAnimation->duration() * 60); - } - - m_smoothScrollingAnimation->stop(); - m_smoothScrollingAnimation->setStartValue(startOffset); - m_smoothScrollingAnimation->setEndValue(endOffset); - m_smoothScrollingAnimation->setEasingCurve(animRunning ? QEasingCurve::OutQuad : QEasingCurve::InOutQuad); - m_smoothScrollingAnimation->start(); - view->setOffset(startOffset); - } else { - view->setOffset(endOffset); - } + m_horizontalSmoothScroller->scrollContentsBy(dx); + m_verticalSmoothScroller->scrollContentsBy(dy); } -bool KItemListContainer::eventFilter(QObject* obj, QEvent* event) +void KItemListContainer::wheelEvent(QWheelEvent* event) { - Q_ASSERT(obj == horizontalScrollBar() || obj == verticalScrollBar()); - - // Check whether the scrollbar has been adjusted by a mouse-event - // triggered by the user and remember this in m_scrollBarPressed. - // The smooth scrolling will only get active if m_scrollBarPressed - // is true (see scrollContentsBy()). - const bool scrollVertical = (m_controller->view()->scrollOrientation() == Qt::Vertical); - const bool checkEvent = ( scrollVertical && obj == verticalScrollBar()) || - (!scrollVertical && obj == horizontalScrollBar()); - if (checkEvent) { - switch (event->type()) { - case QEvent::MouseButtonPress: - m_scrollBarPressed = true; - m_smoothScrolling = true; - break; - - case QEvent::MouseButtonRelease: - m_scrollBarPressed = false; - m_smoothScrolling = false; - break; - - case QEvent::Wheel: - wheelEvent(static_cast(event)); - break; - - default: - break; - } + if (event->modifiers().testFlag(Qt::ControlModifier)) { + event->ignore(); + return; } - return QAbstractScrollArea::eventFilter(obj, event); -} - -void KItemListContainer::wheelEvent(QWheelEvent* event) -{ KItemListView* view = m_controller->view(); - if (!view || event->orientation() != view->scrollOrientation()) { + if (!view) { + event->ignore(); return; } + 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 bool previous = m_smoothScrolling; - m_smoothScrolling = true; - if (view->scrollOrientation() == Qt::Vertical) { - const int value = verticalScrollBar()->value(); - verticalScrollBar()->setValue(value - numSteps * view->size().height()); - } else { - const int value = horizontalScrollBar()->value(); - horizontalScrollBar()->setValue(value - numSteps * view->size().width()); - } - m_smoothScrolling = previous; + const QScrollBar* scrollBar = smoothScroller->scrollBar(); + smoothScroller->scrollTo(scrollBar->value() - numSteps * scrollBar->pageStep() / 4); event->accept(); } +void KItemListContainer::slotScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous) +{ + Q_UNUSED(previous); + updateSmoothScrollers(current); +} + void KItemListContainer::slotModelChanged(KItemModelBase* current, KItemModelBase* previous) { Q_UNUSED(current); @@ -225,120 +174,197 @@ void KItemListContainer::slotViewChanged(KItemListView* current, KItemListView* QGraphicsScene* scene = static_cast(viewport())->scene(); if (previous) { scene->removeItem(previous); - disconnect(previous, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(updateScrollBars())); - disconnect(previous, SIGNAL(maximumOffsetChanged(qreal,qreal)), this, SLOT(updateScrollBars())); - disconnect(previous, SIGNAL(scrollTo(qreal)), this, SLOT(scrollTo(qreal))); - m_smoothScrollingAnimation->setTargetObject(0); + disconnect(previous, 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(current, SIGNAL(offsetChanged(qreal,qreal)), this, SLOT(updateScrollBars())); - connect(current, SIGNAL(maximumOffsetChanged(qreal,qreal)), this, SLOT(updateScrollBars())); - connect(current, SIGNAL(scrollTo(qreal)), this, SLOT(scrollTo(qreal))); - m_smoothScrollingAnimation->setTargetObject(current); - } -} - -void KItemListContainer::slotAnimationStateChanged(QAbstractAnimation::State newState, - QAbstractAnimation::State oldState) -{ - Q_UNUSED(oldState); - if (newState == QAbstractAnimation::Stopped && m_smoothScrolling && !m_scrollBarPressed) { - m_smoothScrolling = false; + 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::scrollTo(qreal offset) { const KItemListView* view = m_controller->view(); - if (!view) { - return; + if (view) { + if (view->scrollOrientation() == Qt::Vertical) { + m_verticalSmoothScroller->scrollTo(offset); + } else { + m_horizontalSmoothScroller->scrollTo(offset); + } } - - m_smoothScrolling = true; - QScrollBar* scrollBar = (view->scrollOrientation() == Qt::Vertical) - ? verticalScrollBar() : horizontalScrollBar(); - scrollBar->setValue(offset); } -void KItemListContainer::updateScrollBars() +void KItemListContainer::updateScrollOffsetScrollBar() { const KItemListView* view = m_controller->view(); if (!view) { return; } - QScrollBar* scrollBar = 0; + KItemListSmoothScroller* smoothScroller = 0; + QScrollBar* scrollOffsetScrollBar = 0; int singleStep = 0; int pageStep = 0; - QScrollBar* otherScrollBar = 0; if (view->scrollOrientation() == Qt::Vertical) { - scrollBar = verticalScrollBar(); + smoothScroller = m_verticalSmoothScroller; + scrollOffsetScrollBar = verticalScrollBar(); singleStep = view->itemSize().height(); pageStep = view->size().height(); - otherScrollBar = horizontalScrollBar(); } else { - scrollBar = horizontalScrollBar(); + smoothScroller = m_horizontalSmoothScroller; + scrollOffsetScrollBar = horizontalScrollBar(); singleStep = view->itemSize().width(); pageStep = view->size().width(); - otherScrollBar = verticalScrollBar(); } - const int value = view->offset(); - const int maximum = qMax(0, int(view->maximumOffset() - pageStep)); - if (m_smoothScrollingAnimation->state() == QAbstractAnimation::Running) { - if (maximum == scrollBar->maximum()) { - // The value has been changed by the animation, no update - // of the scrollbars is required as their target state will be - // reached with the end of the animation. - return; + const int value = view->scrollOffset(); + const int maximum = qMax(0, int(view->maximumScrollOffset() - pageStep)); + 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(); } + } +} - // The maximum has been changed which indicates that the content - // of the view has been changed. Stop the animation in any case and - // update the scrollbars immediately. - m_smoothScrollingAnimation->stop(); +void KItemListContainer::updateItemOffsetScrollBar() +{ + const KItemListView* view = m_controller->view(); + if (!view) { + return; } - scrollBar->setSingleStep(singleStep); - scrollBar->setPageStep(pageStep); - scrollBar->setMinimum(0); - scrollBar->setMaximum(maximum); - scrollBar->setValue(value); + 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(); + } - // Make sure that the other scroll bar is hidden - otherScrollBar->setMaximum(0); - otherScrollBar->setValue(0); + 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(); - int widthDec = frameWidth() * 2; - if (verticalScrollBar()->isVisible()) { - widthDec += style()->pixelMetric(QStyle::PM_ScrollBarExtent); + int extra = frameWidth() * 2; + QStyleOption option; + option.initFrom(this); + if (style()->styleHint(QStyle::SH_ScrollView_FrameOnlyAroundContents, &option, this)) { + extra += 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 + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this) + : extra; + + const int heightDec = horizontalScrollBar()->isVisible() + ? extra + style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this) + : extra; 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(viewport())->scene()->setSceneRect(0, 0, rect.width(), rect.height()); + static_cast(viewport())->viewport()->setGeometry(QRect(0, 0, rect.width(), rect.height())); + + 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::updateScrollOffsetScrollBarPolicy() +{ + const KItemListView* view = m_controller->view(); + Q_ASSERT(view); + const bool vertical = (view->scrollOrientation() == Qt::Vertical); + + QStyleOption option; + option.initFrom(this); + const int scrollBarInc = style()->pixelMetric(QStyle::PM_ScrollBarExtent, &option, this); - static_cast(viewport())->scene()->setSceneRect(0, 0, rect.width(), rect.height()); - static_cast(viewport())->viewport()->setGeometry(QRect(0, 0, rect.width(), rect.height())); + QSizeF newViewSize = m_controller->view()->size(); + if (vertical) { + newViewSize.rwidth() += scrollBarInc; + } else { + newViewSize.rheight() += scrollBarInc; + } - updateScrollBars(); + const Qt::ScrollBarPolicy policy = view->scrollBarRequired(newViewSize) + ? Qt::ScrollBarAlwaysOn : Qt::ScrollBarAsNeeded; + if (vertical) { + setVerticalScrollBarPolicy(policy); + } else { + setHorizontalScrollBarPolicy(policy); + } } void KItemListContainer::initialize() { - if (!m_controller) { + if (m_controller) { + if (m_controller->model()) { + slotModelChanged(m_controller->model(), 0); + } + if (m_controller->view()) { + slotViewChanged(m_controller->view(), 0); + } + } else { m_controller = new KItemListController(this); } @@ -350,13 +376,8 @@ void KItemListContainer::initialize() QGraphicsView* graphicsView = new KItemListContainerViewport(new QGraphicsScene(this), this); setViewport(graphicsView); - m_smoothScrollingAnimation = new QPropertyAnimation(this, "offset"); - m_smoothScrollingAnimation->setDuration(300); - connect(m_smoothScrollingAnimation, SIGNAL(stateChanged(QAbstractAnimation::State,QAbstractAnimation::State)), - this, SLOT(slotAnimationStateChanged(QAbstractAnimation::State,QAbstractAnimation::State))); - - horizontalScrollBar()->installEventFilter(this); - verticalScrollBar()->installEventFilter(this); + m_horizontalSmoothScroller = new KItemListSmoothScroller(horizontalScrollBar(), this); + m_verticalSmoothScroller = new KItemListSmoothScroller(verticalScrollBar(), this); } #include "kitemlistcontainer.moc"