Qt可拖拽排序表格（解决滚动条不兼容问题，类似QQ好友分组排序）
原版链接
https://blog.csdn.net/dpsying/article/details/77206127
Qt可拖拽排序表格（类似QQ好友分组排序）
感谢博主无私分享
修改后，解决了滚动条问题
效果
h文件
#ifndef MYTABLEVIEW_H
#define MYTABLEVIEW_H
#include cpp文件
#include "MyTableView.h"
MyTableView::MyTableView(QWidget *parent)
: QTableView(parent)
{
//设置各种属性
horizontalHeader()->hide(); //隐藏列头(带列头的情况需要修改代码，重新计算高度偏移)
verticalHeader()->hide(); //隐藏行头
verticalHeader()->setDefaultSectionSize(30); //默认列高度
horizontalHeader()->setStretchLastSection(true); //最后一列自适应宽度
setEditTriggers(QTableView::NoEditTriggers); //不能编辑
setSelectionBehavior(QTableView::SelectRows); //一次选中整行
setSelectionMode(QTableView::SingleSelection); //单行选中
setAlternatingRowColors(true); //行间隔色
setShowGrid(false); //去掉网格线
setFocusPolicy(Qt::NoFocus); //去掉item选中时虚线框
//设置样式
setStyleSheet("QTableView {border: 1px solid gray;background: #E8E8E8;}\
QTableView::item{color:black;}\
QTableView::item:selected{color:black;background: #63B8FF;}");
setColumnWidth(0, 40);
//允许拖拽
setAcceptDrops(true);
mLabel = new QLabel(this);
mLabel->setFixedHeight(2);
mLabel->setGeometry(1, 0, width(), 2);
mLabel->setStyleSheet("border: 1px solid #8B7500;");
mLabel->hide();
mModel = NULL;
mRowHeight = 30;
mValidPress = false;
mRowFrom = 0;
mRowTo = 0;
}
void MyTableView::SetModel(QStandardItemModel *model)
{
mModel = model;
QTableView::setModel(model);
}
void MyTableView::mousePressEvent(QMouseEvent *e)
{
if (e->button() == Qt::LeftButton)
{
QModelIndex index = indexAt(e->pos());
if (index.isValid())
{
// 计算滚动行数，以及最后一行时最上方多余距离
int scrollValue = this->verticalScrollBar()->value();
int offsetValue = 0;
bool isScrollBottom = (scrollValue > 0 && scrollValue >= this->verticalScrollBar()->maximum());
if (isScrollBottom)
{
offsetValue = (this->height() - horizontalHeader()->height()) % rowHeight(mRowFrom) - 3;
}
mValidPress = true;
mDragPoint = e->pos();
mDragText = mModel->item(index.row(), 1)->text();
// 分别设置拖动图片起始位置
if (isScrollBottom)
{
mDragPointAtItem = mDragPoint - QPoint(0,((index.row()-scrollValue)*mRowHeight)+(mRowHeight-offsetValue));
}
else
{
mDragPointAtItem = mDragPoint - QPoint(0,(index.row()-scrollValue)*mRowHeight);
}
mRowFrom = index.row();
}
}
QTableView::mousePressEvent(e);
}
void MyTableView::mouseMoveEvent(QMouseEvent * e)
{
if (!mValidPress)
{
return;
}
if (!(e->buttons() & Qt::LeftButton))
return;
if ((e->pos() - mDragPoint).manhattanLength() < QApplication::startDragDistance())
return;
mLabel->show();
DoDrag(); //开始拖拽，完成拖拽后才会继续往下走
mLabel->hide();
mValidPress = false;
update();
}
void MyTableView::dragEnterEvent(QDragEnterEvent * e)
{
if (e->mimeData()->hasText())
{
e->acceptProposedAction();
}
else
{
e->ignore();
QTableView::dragEnterEvent(e);
}
}
void MyTableView::dragMoveEvent(QDragMoveEvent * e)
{
if (e->mimeData()->hasText())
{
// 计算滚动行数，以及最后一行时最上方多余距离
int scrollValue = this->verticalScrollBar()->value();
int offsetValue = 0;
bool isScrollBottom = (scrollValue > 0 && scrollValue >= this->verticalScrollBar()->maximum());
if (isScrollBottom)
{
offsetValue = (this->height() - horizontalHeader()->height()) % rowHeight(mRowFrom) - 3;
}
int nCurRow = 0;
QModelIndex index = indexAt(e->pos());
if (index.isValid())
{
if (e->pos().y() - ((index.row()-scrollValue)*mRowHeight+(mRowHeight-offsetValue))>= mRowHeight / 2)
{
nCurRow = index.row() + 1;
}
else
{
nCurRow = index.row();
}
}
else
{
nCurRow = mModel->rowCount();
}
{
mRowTo = nCurRow;
// mLabel->setGeometry(1, mRowTo*mRowHeight, width() - 2, 2);
//添加滚动检测
//分别设置拖动图片显示位置
if (isScrollBottom)
{
mLabel->setGeometry(1, ((mRowTo-scrollValue)*mRowHeight+(mRowHeight-offsetValue)), width() - 2, 2);
}
else
{
mLabel->setGeometry(1, (mRowTo-scrollValue)*mRowHeight, width() - 2, 2);
}
}
e->acceptProposedAction();
return;
}
e->ignore();
QTableView::dragMoveEvent(e);
}
void MyTableView::dropEvent(QDropEvent * e)
{
if (e->mimeData()->hasText())
{
if (mRowTo != mRowFrom)
{
MoveRow(mRowFrom, mRowTo);
}
e->acceptProposedAction();
return;
}
e->ignore();
QTableView::dropEvent(e);
}
void MyTableView::DoDrag()
{
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setText(mDragText);
drag->setMimeData(mimeData);
// 设置拖拽图片
QPixmap drag_img(width(), mRowHeight);
drag_img.fill(QColor(255, 255, 255, 100));
QPainter painter(&drag_img);
painter.setPen(QColor(0, 0, 0, 200));
painter.drawText(QRectF(40, 0, width(), mRowHeight), mDragText, QTextOption(Qt::AlignVCenter));
drag->setPixmap(drag_img);
drag->setHotSpot(mDragPointAtItem);
//***注意：此句会阻塞，进入drag的拖拽消息循环，会依次触发dragEnterEvent、dragMoveEvent、dropEvent消息
if (drag->exec(Qt::MoveAction) == Qt::MoveAction)
{
// 确认移动操作
}
}
void MyTableView::ResetOrder()
{
for (int i = 0; i < mModel->rowCount(); i++)
{
mModel->item(i, 0)->setText(QString::number(i + 1));
}
}
void MyTableView::MoveRow(int from, int to)
{
if (from == to)
{
return;
}
QStandardItem * item = mModel->item(from, 1);
if (item)
{
QString strText = item->text();
QList<QStandardItem*> items;
QStandardItem* item0 = new QStandardItem("");
QStandardItem* item1 = new QStandardItem(strText);
items.append(item0);
items.append(item1);
item0->setTextAlignment(Qt::AlignCenter);
//移动行思路：就是先在要移动到的位置新建同样内容的行，然后删除被移动的行
mModel->insertRow(to, items);
if (from < to)
{
mModel->removeRow(from);
selectRow(to - 1);
}
else
{
mModel->removeRow(from + 1);
selectRow(to);
}
ResetOrder();
emit sigRowChange(mRowFrom, mRowTo);
}
}