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DragDropHelper.cpp
230 lines | 7.4 KiB | text/x-c | CppLexer
/ gui / src / DragDropHelper.cpp
#include "DragDropHelper.h"
#include "SqpApplication.h"
#include "Visualization/VisualizationDragWidget.h"
#include <QDir>
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QScrollArea>
#include <QScrollBar>
#include <QTimer>
#include <QVBoxLayout>
const QString DragDropHelper::MIME_TYPE_GRAPH = "scqlop/graph";
const QString DragDropHelper::MIME_TYPE_ZONE = "scqlop/zone";
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);
}
}
struct DragDropHelper::DragDropHelperPrivate {
VisualizationDragWidget *m_CurrentDragWidget = nullptr;
std::unique_ptr<QWidget> m_PlaceHolder = nullptr;
std::unique_ptr<DragDropScroller> m_DragDropScroller = nullptr;
QString m_ImageTempUrl; // Temporary file for image url generated by the drag & drop. Not using
// QTemporaryFile to have a name which is not generated.
explicit DragDropHelperPrivate()
: m_PlaceHolder{std::make_unique<QWidget>()},
m_DragDropScroller{std::make_unique<DragDropScroller>()}
{
m_PlaceHolder->setStyleSheet("background-color: #BBD5EE; border:2px solid #2A7FD4");
sqpApp->installEventFilter(m_DragDropScroller.get());
m_ImageTempUrl = QDir::temp().absoluteFilePath("Scqlop_graph.png");
}
void preparePlaceHolder() const
{
if (m_CurrentDragWidget) {
m_PlaceHolder->setMinimumSize(m_CurrentDragWidget->size());
m_PlaceHolder->setSizePolicy(m_CurrentDragWidget->sizePolicy());
}
else {
m_PlaceHolder->setMinimumSize(200, 200);
}
}
};
DragDropHelper::DragDropHelper() : impl{spimpl::make_unique_impl<DragDropHelperPrivate>()}
{
}
DragDropHelper::~DragDropHelper()
{
QFile::remove(impl->m_ImageTempUrl);
}
void DragDropHelper::setCurrentDragWidget(VisualizationDragWidget *dragWidget)
{
impl->m_CurrentDragWidget = dragWidget;
}
VisualizationDragWidget *DragDropHelper::getCurrentDragWidget() const
{
return impl->m_CurrentDragWidget;
}
QWidget &DragDropHelper::placeHolder() const
{
return *impl->m_PlaceHolder;
}
void DragDropHelper::insertPlaceHolder(QVBoxLayout *layout, int index)
{
removePlaceHolder();
impl->preparePlaceHolder();
layout->insertWidget(index, impl->m_PlaceHolder.get());
impl->m_PlaceHolder->show();
}
void DragDropHelper::removePlaceHolder()
{
auto parentWidget = impl->m_PlaceHolder->parentWidget();
if (parentWidget) {
parentWidget->layout()->removeWidget(impl->m_PlaceHolder.get());
impl->m_PlaceHolder->setParent(nullptr);
impl->m_PlaceHolder->hide();
}
}
bool DragDropHelper::isPlaceHolderSet() const
{
return impl->m_PlaceHolder->parentWidget();
}
void DragDropHelper::addDragDropScrollArea(QScrollArea *scrollArea)
{
impl->m_DragDropScroller->addScrollArea(scrollArea);
}
void DragDropHelper::removeDragDropScrollArea(QScrollArea *scrollArea)
{
impl->m_DragDropScroller->removeScrollArea(scrollArea);
}
QUrl DragDropHelper::imageTemporaryUrl(const QImage &image) const
{
image.save(impl->m_ImageTempUrl);
return QUrl::fromLocalFile(impl->m_ImageTempUrl);
}