弹出窗口在从标题项的右上角开始的矩形中显示垂直标题文本
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【中文标题】弹出窗口在从标题项的右上角开始的矩形中显示垂直标题文本【英文标题】：popup showing vertical header text in rectangle starting top right corner of header item 【发布时间】：2021-10-29 11:28:16 【问题描述】：我尝试制作显示垂直标题项目名称的弹出标签，因为名称很大，我希望标题宽度正好是其数字的大小。 我制作了事件过滤器并制作了弹出对话框和 popuplabel qlabel。 但弹出窗口的大小大于标题项的大小。 如果我使大小等于矩形大小，则文本消失。 如果我调整弹出窗口的大小，它会产生更大的矩形显示文本，向下偏移对应于标题项的视觉索引。 这是代码：
#ifndef TABLEVIEW_H
#define TABLEVIEW_H
#include <QDialog>
#include <QEvent>
#include <QLabel>
#include <QMouseEvent>
#include <QTableView>
#include <QVBoxLayout>
#include <QHeaderView>
#include <QTimer>
class TableView : public QTableView
Q_OBJECT
QDialog* popup;
QLabel* popupLabel;
int editor_index ;
public:
TableView(QWidget* parent = Q_NULLPTR) :QTableView(parent)
viewport()->installEventFilter(this);
horizontalHeader()->viewport()->installEventFilter(this);
verticalHeader()->viewport()->installEventFilter(this);
setMouseTracking(true);
popup = new QDialog(this, Qt::Popup | Qt::ToolTip);
//popup = new QDialog(viewport(), Qt::Popup | Qt::ToolTip);
//QVBoxLayout* layout = new QVBoxLayout;
popupLabel = new QLabel(popup);
popupLabel->setWordWrap(false);
//layout->addWidget(popupLabel);
popupLabel->setTextFormat(Qt::RichText);
//popup->setLayout(layout);
popup->installEventFilter(this);
QTimer::singleShot(0, popup, &QWidget::hide);
bool eventFilter(QObject* watched, QEvent* event)
//if (viewport() == watched)
if ((watched == horizontalHeader()->viewport() ||
watched == verticalHeader()->viewport()))
if (event->type() == QEvent::MouseMove)
/*/
if (popup) //delete previous popup just in case
popup->contentsRect().setRect(0,0,0,0) ;
if (popupLabel) //delete previous popupLabel just in case
popupLabel->contentsRect().setRect(0,0,0,0);
*/
/*
////////////////////////////////////////////////////////
popup = new QDialog(this, Qt::Popup | Qt::ToolTip);
//popup = new QDialog(viewport(), Qt::Popup | Qt::ToolTip);
//QVBoxLayout* layout = new QVBoxLayout;
popupLabel = new QLabel(popup);
popupLabel->setWordWrap(false);
//layout->addWidget(popupLabel);
popupLabel->setTextFormat(Qt::RichText);
//popup->setLayout(layout);
popup->installEventFilter(this);
QTimer::singleShot(0, popup, &QWidget::hide);
////////////////////////////////////////////////////////
*/
QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
QHeaderView* header = static_cast<QHeaderView*>(watched->parent());
int mouse_pos = header->orientation() == Qt::Horizontal ? mouseEvent->x() : mouseEvent->y();
int logical_index = header->logicalIndex(header->visualIndexAt(mouse_pos));
if (logical_index >= 0)
// if mouse is over an item
showPopup(logical_index, watched);
else
popup->hide();
else if (event->type() == QEvent::Leave)
popup->hide();
else if (popup == watched)
if (event->type() == QEvent::Leave)
popup->hide();
return QTableView::eventFilter(watched, event);
private:
void showPopup(const int & logical_index, QObject* watched) const
if (logical_index >= 0)
QHeaderView* header = static_cast<QHeaderView*>(watched->parent());
QFont font("times", 12);
QFontMetrics fm(font);
int pixelsWide = fm.width("xxxxxx");
int pixelsHigh = fm.height();
QRect rect; // line edit rect in header's viewport's coordinates
if (header->orientation() == Qt::Horizontal)
//rect.setLeft(header->sectionPosition(logical_index));
rect.setLeft(header->sectionViewportPosition(logical_index));
rect.setWidth(header->sectionSize(logical_index));
rect.setTop(0);
rect.setHeight(header->height());
else
//rect.setTop((header->sectionPosition(logical_index)));
rect.setTop((header->sectionViewportPosition(logical_index)));
//QPoint point(0,header->sectionPosition(logical_index));
//rect.setTop((mapToGlobal(point)).y() );
//rect.topLeft())
int cy = header->sectionSize(logical_index);
rect.setHeight(header->sectionSize(logical_index));
rect.setLeft(0);
rect.setWidth(header->width());
//rect.setCoords(rect.left(),rect.top(),rect.left()+rect.width(),rect.top()+rect.height());
//rect.adjust(1, 1, 1, 1);
popupLabel->move(rect.bottomLeft());
//popupLabel->move(rect.topLeft());
//popupLabel->move(viewport()->mapToGlobal(rect.topLeft()));
popupLabel->resize(rect.size());
//popupLabel->setAlignment(Qt::AlignTop | Qt::AlignLeft);
//popupLabel->show();
//popupLabel->setFixedHeight(rect.height());
//popupLabel->setFixedWidth(rect.width());
//popupLabel->setFrame(false);
//get current item text
QString text = header->model()->
headerData(logical_index, header->orientation()).toString();
//int z=text.size();
popupLabel->setText(text);
//popupLabel->setFocus();
///////////////////////////////////////////////////////////////////////////
//editor_index = logical_index; //save for future use
popupLabel->installEventFilter(this->parent()); //catch focus out event
//if user presses Enter it should close editor
//connect(header_editor, SIGNAL(returnPressed()),
// ui->tableWidget, SLOT(setFocus()));
//popupLabel->setGeometry(rect);
//popupLabel->adjustSize();
//popupLabel->setFixedSize(100, 100);
popupLabel->show();
////////////////////////////////////////////////////////////////////////////
//popup->move(viewport()->mapToGlobal(rect.bottomLeft()));
popup->move(viewport()->mapToGlobal(rect.topLeft()));
//popup->move(rect.topLeft());
//popup->resize(rect.size());
//popup->move(rect.bottomLeft());
//popup->move(rect.topLeft());
//popup->setFixedSize(100, popup->heightForWidth(100));
//popup->setFixedSize(100, 100);
//popupLabel->setText(text);
//popupLabel->show();
// popupLabel->setText(logical_index.data(Qt::DisplayRole).toString());
//popup->adjustSize();
//popup->setGeometry(rect);
popup->show();
//sleep 10 ms;
return;// true; // filter out event
else
popup->hide();
//delete previous popup just in case
popup->contentsRect().setRect(0, 0, 0, 0);
//popup = nullptr;
//delete previous popupLabel just in case
popupLabel->contentsRect().setRect(0, 0, 0, 0);
//popupLabel = nullptr;
return; //false;
;
#endif // TABLEVIEW_H
【问题讨论】：
【参考方案1】：我用超越比较来找出我改变了什么：
1.我将popupLabel移动到指向0,0
2.我将popup调整为rect.size()
如果没有足够的空间来显示文本，我会将popupLabel和popup调整为更大的尺寸。
代码：
#include <QApplication>
#include <QTableWidget>
#include <QStyledItemDelegate>
#include <QDialog>
#include <QEvent>
#include <QLabel>
#include <QMouseEvent>
#include <QTableView>
#include <QVBoxLayout>
#include <QHeaderView>
#include <QTimer>
#include <QDebug>
class TableModel :public QAbstractTableModel
Q_OBJECT
public:
int rowCount(const QModelIndex& parent = QModelIndex()) const
return 4;
int columnCount(const QModelIndex& parent = QModelIndex()) const
return 2;
QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const
if (role == Qt::DisplayRole)
return QString::number(index.row()) + QString::number(index.column());
return QVariant();
;
class TableView : public QTableView
Q_OBJECT
QDialog* popup;
QLabel* popupLabel;
int editor_index;
public:
TableView(QWidget* parent = Q_NULLPTR) :QTableView(parent)
viewport()->installEventFilter(this);
horizontalHeader()->viewport()->installEventFilter(this);
verticalHeader()->viewport()->installEventFilter(this);
setMouseTracking(true);
popup = new QDialog(this, Qt::Popup | Qt::ToolTip);
//popup = new QDialog(viewport(), Qt::Popup | Qt::ToolTip);
//QVBoxLayout* layout = new QVBoxLayout;
popupLabel = new QLabel(popup);
popupLabel->setWordWrap(false);
//layout->addWidget(popupLabel);
popupLabel->setTextFormat(Qt::RichText);
//popup->setLayout(layout);
popup->installEventFilter(this);
QTimer::singleShot(0, popup, &QWidget::hide);
bool eventFilter(QObject* watched, QEvent* event)
//if (viewport() == watched)
if ((watched == horizontalHeader()->viewport() ||
watched == verticalHeader()->viewport()))
if (event->type() == QEvent::MouseMove)
/*/
if (popup) //delete previous popup just in case
popup->contentsRect().setRect(0,0,0,0) ;
if (popupLabel) //delete previous popupLabel just in case
popupLabel->contentsRect().setRect(0,0,0,0);
*/
/*
////////////////////////////////////////////////////////
popup = new QDialog(this, Qt::Popup | Qt::ToolTip);
//popup = new QDialog(viewport(), Qt::Popup | Qt::ToolTip);
//QVBoxLayout* layout = new QVBoxLayout;
popupLabel = new QLabel(popup);
popupLabel->setWordWrap(false);
//layout->addWidget(popupLabel);
popupLabel->setTextFormat(Qt::RichText);
//popup->setLayout(layout);
popup->installEventFilter(this);
QTimer::singleShot(0, popup, &QWidget::hide);
////////////////////////////////////////////////////////
*/
QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
QHeaderView* header = static_cast<QHeaderView*>(watched->parent());
int mouse_pos = header->orientation() == Qt::Horizontal ? mouseEvent->x() : mouseEvent->y();
int logical_index = header->logicalIndex(header->visualIndexAt(mouse_pos));
if (logical_index >= 0)
// if mouse is over an item
showPopup(logical_index, watched);
else
popup->hide();
else if (event->type() == QEvent::Leave)
popup->hide();
else if (popup == watched)
if (event->type() == QEvent::Leave)
popup->hide();
return QTableView::eventFilter(watched, event);
private:
void showPopup(const int& logical_index, QObject* watched) const
if (logical_index >= 0)
QHeaderView* header = static_cast<QHeaderView*>(watched->parent());
QFont font("times", 12);
QFontMetrics fm(font);
int pixelsWide = fm.width("xxxxxx");
int pixelsHigh = fm.height();
QRect rect; // line edit rect in header's viewport's coordinates
if (header->orientation() == Qt::Horizontal)
//rect.setLeft(header->sectionPosition(logical_index));
rect.setLeft(header->sectionViewportPosition(logical_index));
rect.setWidth(header->sectionSize(logical_index));
rect.setTop(0);
rect.setHeight(header->height());
else
//rect.setTop((header->sectionPosition(logical_index)));
rect.setTop((header->sectionViewportPosition(logical_index)));
//QPoint point(0,header->sectionPosition(logical_index));
//rect.setTop((mapToGlobal(point)).y() );
//rect.topLeft())
int cy = header->sectionSize(logical_index);
rect.setHeight(header->sectionSize(logical_index));
rect.setLeft(0);
rect.setWidth(header->width());
//rect.setCoords(rect.left(),rect.top(),rect.left()+rect.width(),rect.top()+rect.height());
//rect.adjust(1, 1, 1, 1);
//popupLabel->move(rect.bottomLeft());
//popupLabel->move(rect.topLeft());
popupLabel->move(QPoint(0,0));
popupLabel->resize(rect.size());
//popupLabel->setAlignment(Qt::AlignTop | Qt::AlignLeft);
//popupLabel->show();
//popupLabel->setFixedHeight(rect.height());
//popupLabel->setFixedWidth(rect.width());
//popupLabel->setFrame(false);
//get current item text
QString text = header->model()->
headerData(logical_index, header->orientation()).toString();
//int z=text.size();
popupLabel->setText(text);
qDebug() << rect << text;
//popupLabel->setFocus();
///////////////////////////////////////////////////////////////////////////
//editor_index = logical_index; //save for future use
popupLabel->installEventFilter(this->parent()); //catch focus out event
//if user presses Enter it should close editor
//connect(header_editor, SIGNAL(returnPressed()),
// ui->tableWidget, SLOT(setFocus()));
//popupLabel->setGeometry(rect);
//popupLabel->adjustSize();
//popupLabel->setFixedSize(100, 100);
popupLabel->show();
////////////////////////////////////////////////////////////////////////////
//popup->move(viewport()->mapToGlobal(rect.bottomLeft()));
popup->move(viewport()->mapToGlobal(rect.topLeft()));
//popup->move(rect.topLeft());
popup->resize(rect.size());
//popup->move(rect.bottomLeft());
//popup->move(rect.topLeft());
//popup->setFixedSize(100, popup->heightForWidth(100));
//popup->setFixedSize(100, 100);
//popupLabel->setText(text);
//popupLabel->show();
// popupLabel->setText(logical_index.data(Qt::DisplayRole).toString());
//popup->adjustSize();
//popup->setGeometry(rect);
popup->show();
//sleep 10 ms;
return;// true; // filter out event
else
popup->hide();
//delete previous popup just in case
popup->contentsRect().setRect(0, 0, 0, 0);
//popup = nullptr;
//delete previous popupLabel just in case
popupLabel->contentsRect().setRect(0, 0, 0, 0);
//popupLabel = nullptr;
return; //false;
;
#include"main.moc"
int main(int argc, char* argv[])
QApplication a(argc, argv);
TableView view;
view.setModel(new TableModel);
view.show();
return a.exec();
【讨论】：
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