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Removed interaction handling in QCP since they are implemented in...
Removed interaction handling in QCP since they are implemented in SciQLop Before the wheel interaction was done multiple times on QCP side first then on SciQLop side. Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>
trabillard - - Load All Authors

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r885:dd73a5040007
r1358:48660d9880a2
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DragDropScroller.cpp
125 lines | 4.4 KiB | text/x-c | CppLexer
/ gui / src / DragAndDrop / DragDropScroller.cpp
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trabillard
Moves the class DragDropScroller in its own file
 r885 #include "DragAndDrop/DragDropScroller.h"
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QScrollBar>
#include <QTimer>
const int SCROLL_SPEED = 5;
const int SCROLL_ZONE_SIZE = 50;
struct DragDropScroller::DragDropScrollerPrivate {
QList<QScrollArea *> m_ScrollAreas;
QScrollArea *m_CurrentScrollArea = nullptr;
std::unique_ptr<QTimer> m_Timer = nullptr;
enum class ScrollDirection { up, down, unknown };
ScrollDirection m_Direction = ScrollDirection::unknown;
explicit DragDropScrollerPrivate() : m_Timer{std::make_unique<QTimer>()}
{
m_Timer->setInterval(0);
}
};
DragDropScroller::DragDropScroller(QObject *parent)
: QObject{parent}, impl{spimpl::make_unique_impl<DragDropScrollerPrivate>()}
{
connect(impl->m_Timer.get(), &QTimer::timeout, this, &DragDropScroller::onTimer);
}
void DragDropScroller::addScrollArea(QScrollArea *scrollArea)
{
impl->m_ScrollAreas << scrollArea;
scrollArea->viewport()->setAcceptDrops(true);
}
void DragDropScroller::removeScrollArea(QScrollArea *scrollArea)
{
impl->m_ScrollAreas.removeAll(scrollArea);
scrollArea->viewport()->setAcceptDrops(false);
}
bool DragDropScroller::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::DragMove) {
auto w = static_cast<QWidget *>(obj);
if (impl->m_CurrentScrollArea && impl->m_CurrentScrollArea->isAncestorOf(w)) {
auto moveEvent = static_cast<QDragMoveEvent *>(event);
auto pos = moveEvent->pos();
if (impl->m_CurrentScrollArea->viewport() != w) {
auto globalPos = w->mapToGlobal(moveEvent->pos());
pos = impl->m_CurrentScrollArea->viewport()->mapFromGlobal(globalPos);
}
auto isInTopZone = pos.y() > impl->m_CurrentScrollArea->viewport()->size().height()
- SCROLL_ZONE_SIZE;
auto isInBottomZone = pos.y() < SCROLL_ZONE_SIZE;
if (!isInTopZone && !isInBottomZone) {
impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
impl->m_Timer->stop();
}
else if (!impl->m_Timer->isActive()) {
impl->m_Direction = isInTopZone ? DragDropScrollerPrivate::ScrollDirection::up
: DragDropScrollerPrivate::ScrollDirection::down;
impl->m_Timer->start();
}
}
}
else if (event->type() == QEvent::DragEnter) {
auto w = static_cast<QWidget *>(obj);
for (auto scrollArea : impl->m_ScrollAreas) {
if (impl->m_CurrentScrollArea != scrollArea && scrollArea->isAncestorOf(w)) {
auto enterEvent = static_cast<QDragEnterEvent *>(event);
enterEvent->acceptProposedAction();
enterEvent->setDropAction(Qt::IgnoreAction);
impl->m_CurrentScrollArea = scrollArea;
break;
}
}
}
else if (event->type() == QEvent::DragLeave) {
if (impl->m_CurrentScrollArea) {
if (!QRect(QPoint(), impl->m_CurrentScrollArea->size())
.contains(impl->m_CurrentScrollArea->mapFromGlobal(QCursor::pos()))) {
impl->m_CurrentScrollArea = nullptr;
impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
impl->m_Timer->stop();
}
}
}
else if (event->type() == QEvent::Drop) {
if (impl->m_CurrentScrollArea) {
impl->m_CurrentScrollArea = nullptr;
impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
impl->m_Timer->stop();
}
}
return false;
}
void DragDropScroller::onTimer()
{
if (impl->m_CurrentScrollArea) {
auto mvt = 0;
switch (impl->m_Direction) {
case DragDropScrollerPrivate::ScrollDirection::up:
mvt = SCROLL_SPEED;
break;
case DragDropScrollerPrivate::ScrollDirection::down:
mvt = -SCROLL_SPEED;
break;
default:
break;
}
impl->m_CurrentScrollArea->verticalScrollBar()->setValue(
impl->m_CurrentScrollArea->verticalScrollBar()->value() + mvt);
}
}