Qt之QAbstractItemView视图项拖拽2

#include "stdafx.h" #include <QtGui/QDropEvent> #include <QtGui/QMouseEvent> #include <QtGui/QDragMoveEvent> #include <QtGui/QDragEnterEvent> #include <QtGui/QContextMenuEvent> #include <QtWidgets/QStyle> #include <QtWidgets/QHBoxLayout> #include "DragList.h" QVariant MimeData::retrieveData(const QString & format, QVariant::Type preferredType) const { return QMimeData::retrieveData(format, preferredType); } ListItem::ListItem(QWidget * parent /*= nullptr*/) : QWidget(parent) { setObjectName(QStringLiteral("ItemWidgetBg")); m_MainWidgetBg = new QWidget(this); QVBoxLayout * mainLayout = new QVBoxLayout; m_Name = new QLabel; m_Count = new QLabel; // m_MainWidgetBg->setObjectName(QStringLiteral("ItemWidgetBg")); mainLayout->setContentsMargins(0, 0, 0, 0); mainLayout->setSpacing(0); mainLayout->addWidget(m_Name); mainLayout->addWidget(m_Count); m_MainWidgetBg->setLayout(mainLayout); QHBoxLayout * fwLayout = new QHBoxLayout; fwLayout->setContentsMargins(0, 0, 0, 0); fwLayout->setSpacing(0); fwLayout->addWidget(m_MainWidgetBg); setLayout(fwLayout); // setStyleSheet("QWidget{background:transparent;}" // "QWidget[insertPos=1]{border:0;border-bottom:1 solid red;}"); } ListItem::~ListItem() { } void ListItem::SetData(const ItemData & data) { m_Data = data; m_Name->setText(m_Data.name); m_Count->setText(QString::number(m_Data.percent)); } ItemData ListItem::GetData() const { return m_Data; } void ListItem::paintEvent(QPaintEvent * event) { if (m_bInsertPos) { QPainter painter(this); painter.setPen(QPen(Qt::green, 1)); QLine line(rect().bottomLeft(), rect().bottomRight()); painter.drawLine(line); } // QWidget::paintEvent(event); } DragList::DragList(QWidget * parent) : QListWidget(parent) { setAcceptDrops(true);//设置QListWidget的Item项可以被拖拽 setFocusPolicy(Qt::NoFocus); ItemData data; data.name = "test1"; data.percent = 1; AddItem(data); data.name = "test2"; data.percent = 2; AddItem(data); data.name = "test3"; data.percent = 3; AddItem(data); data.name = "test4"; data.percent = 4; AddItem(data); data.name = "test5"; data.percent = 5; AddItem(data); data.name = "test6"; data.percent = 6; AddItem(data); data.name = "test7"; data.percent = 7; AddItem(data); data.name = "test8"; data.percent = 8; setCurrentItem(AddItem(data)); //setStyleSheet(QString("QListView::item{height:40px;}" // "QListView::item{height:40px;border:0;border-bottom:1 solid red;}" // "QListView::item:alternate {background: #EEEEEE;}" // "QListView::item:selected{border: 1px solid #6a6ea9;}" // "QListView::item:selected:!active{background: qlineargradient(x1 : 0, y1 : 0, x2 : 0, y2 : 1,stop : 0 #ABAFE5, stop: 1 #8588B2); }" // "QListView::item:selected:active{background: qlineargradient(x1 : 0, y1:0, x2:0, y2:1,stop : 0 #6a6ea9, stop: 1 #888dd9);}" // "QListView::item:hover {background: qlineargradient(x1 : 0, y1 : 0, x2 : 0, y2 : 1, stop : 0 #FAFBFE, stop: 1 #DCDEF1);}")); setStyleSheet(QString("QListView::item{height:40px;}" "QListView::item:alternate {background: #EEEEEE;}" "QListView::item:selected:!active{background:blue; }" "QListView::item:selected:active{background:red;}" "QListView::item:hover {background:gray;}" "QWidget#ItemWidgetBg{background:blue;}" )); } DragList::~DragList() { } QListWidgetItem * DragList::AddItem(const ItemData & data) { ListItem * itemWidget = new ListItem; itemWidget->SetData(data); QListWidgetItem * item = new QListWidgetItem; addItem(item); setItemWidget(item, itemWidget); return item; } void DragList::mousePressEvent(QMouseEvent * event) { if (event->button() == Qt::LeftButton) { m_LeftPress = true; startPos = event->pos(); dragItem = itemAt(event->pos()); } QListWidget::mousePressEvent(event); } void DragList::mouseMoveEvent(QMouseEvent * event) { QListWidgetItem * item = itemAt(event->pos()); if (dragItem == nullptr) { dragItem = itemAt(event->pos()); } if (m_ShotPicture == nullptr) { InitShotLabel(); } if (m_ShotLine == nullptr) { InitShotLine(); } QRect rect = visualItemRect(dragItem); if (ListItem * hoverWidget = ItemWidget(item)) { QRect hoverRect = visualItemRect(item); QPoint pos = hoverWidget->mapFromParent(event->pos()); if (hoverRect.size().height() / 2 < pos.y()) { m_ShotLine->move(mapToGlobal(QPoint(2, hoverRect.y() + hoverRect.height() + 1))); } else { m_ShotLine->move(mapToGlobal(QPoint(2, hoverRect.y() + 1))); } m_ShotLine->setVisible(hoverRect.contains(event->pos())); } if (ListItem * newWidget = ItemWidget(dragItem)) { m_ShotPicture->move(mapToGlobal(event->pos() - newWidget->mapFromParent(startPos))); if (rect.contains(event->pos()) || event->pos().isNull()) { setCursor(Qt::ForbiddenCursor); } else { setCursor(Qt::ArrowCursor); } if (m_ShotPicture->isHidden()) { m_ShotPicture->show(); } } // QListWidget::mouseMoveEvent(event); } void DragList::mouseReleaseEvent(QMouseEvent * event) { if (event->button() == Qt::LeftButton) { m_LeftPress = false; if (m_ShotPicture) { m_ShotPicture->close(); m_ShotPicture->deleteLater(); m_ShotPicture = nullptr; } if (m_ShotLine) { m_ShotLine->close(); m_ShotLine->deleteLater(); m_ShotLine = nullptr; } MouseRelease(event); } setCursor(Qt::ArrowCursor); QListWidget::mouseReleaseEvent(event); } void DragList::dragEnterEvent(QDragEnterEvent * event) { DragList * source = (DragList *)((void *)(event->source())); if (source && source == this) { if (m_ShotPicture) { m_ShotPicture->show(); } event->accept(); } } void DragList::dragLeaveEvent(QDragLeaveEvent *event) { if (m_ShotPicture) { m_ShotPicture->hide(); } } void DragList::dragMoveEvent(QDragMoveEvent * event) { DragList * source = (DragList *)((void *)(event->source())); if (source && source == this) { QListWidgetItem * item = itemAt(event->pos()); if (dragItem != nullptr && item != nullptr && m_Drag != nullptr) { if ((dragItem == item) != m_IsSelf) { m_IsSelf = dragItem == item; if (m_IsSelf) { event->setDropAction(Qt::LinkAction); } else { event->setDropAction(Qt::MoveAction); } } } if (m_ShotPicture == nullptr) { InitShotLabel(); } if (ListItem * newWidget = ItemWidget(dragItem)) { m_ShotPicture->move(mapToGlobal(event->pos() - newWidget->mapFromParent(startPos))); } event->accept(); } } void DragList::dropEvent(QDropEvent * event) { DragList * source = (DragList *)((void *)(event->source())); if (source && source == this) { endPos = event->pos();//得到鼠标移动到的坐标 QListWidgetItem * item = itemAt(endPos); //通过endPos获取鼠标位置所在的行 if (item == dragItem) { event->setDropAction(Qt::LinkAction); } else { int insertPos = row(item); if (ListItem * oldWidget = ItemWidget(item)) { QPoint pos = oldWidget->mapFromParent(endPos); if (oldWidget->size().height() / 2 < pos.y()) { insertPos += 1; } } // if (const MimeData * mimeData = dynamic_cast<const MimeData *>(event->mimeData())) { if (dragItem) { if (ListItem * oldWidget = ItemWidget(dragItem)) { // QListWidgetItem * newItem = new QListWidgetItem; // ListItem * itemWidget = new ListItem; // itemWidget->SetData(oldWidget->GetData()); // // insertItem(insertPos, newItem); // setItemWidget(newItem, itemWidget); // // setCurrentItem(newItem); // oldWidget->deleteLater(); } // dragItem = takeItem(row(dragItem)); // if (dragItem) // { // delete dra