The following toy problem show two tabs, each tab contains a QGridLayout, which has a ScrollArea on one of the cells, which in turn contains a customized QLabel (MyLabel). When the user moves his mouse on the customzied QLabel, a tooltip shows up for several seconds.
test.pro
QT += core gui widgets
CONFIG += c++17
CONFIG += debug
QMAKE_CXXFLAGS += -std=c++17
SOURCES += \
test.cpp
QMAKE_CLEAN += $$TARGET Makefile
HEADERS += \
mywidget.h
test.cpp
#include "mywidget.h"
#include <QApplication>
#include <QtGui>
#include <QtCore>
#include <QtWidgets>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MyMainWindow myMainWindow;
myMainWindow.show();
return a.exec();
}
mywidget.h
#ifndef MYWIDGET_H
#define MYWIDGET_H
#include <QDebug>
#include <QWidget>
#include <QMdiArea>
#include <QMainWindow>
#include <QScrollArea>
#include <QLabel>
#include <QGridLayout>
#include <QMouseEvent>
#include <QToolTip>
class MyLabel : public QLabel
{
Q_OBJECT
public:
MyLabel(QWidget *parent=nullptr, const QString &name="")
: QLabel(parent), m_name(name)
{
resize(1800, 1200);
setMouseTracking(true);
}
private:
void mouseMoveEvent(QMouseEvent *ev) override {
QToolTip::showText(
ev->globalPosition().toPoint()
, m_name + ": " + QString::number(ev->pos().x()) + ", " + QString::number(ev->pos().y())
);
QLabel::mouseMoveEvent(ev);
}
private:
QString m_name;
};
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget(QWidget* parent = nullptr, const QString &name="")
: QWidget(parent), m_name(name)
{
setWindowTitle(name);
m_gridLayout = new QGridLayout(this);
this->setLayout(m_gridLayout);
// layout col 1
m_gridLayout->addWidget(new QLabel("smaller label", this), 0, 0);
// layout col 2
m_scrollArea = new QScrollArea(this);
MyLabel *label = new MyLabel(this, m_name);
m_scrollArea->setWidget(label);
m_gridLayout->addWidget(m_scrollArea, 0, 1);
}
private:
QString m_name;
QGridLayout *m_gridLayout;
QScrollArea *m_scrollArea;
};
class MyMainWindow : public QMainWindow
{
Q_OBJECT
public:
MyMainWindow(QWidget* parent = nullptr)
: QMainWindow(parent)
{
m_mdiArea = new QMdiArea(this);
this->setCentralWidget(m_mdiArea);
MyWidget *myWidget1 = new MyWidget(this, "widget 1");
m_mdiArea->addSubWindow(myWidget1);
MyWidget *myWidget2 = new MyWidget(this, "widget 2");
m_mdiArea->addSubWindow(myWidget2);
m_mdiArea->setViewMode(QMdiArea::ViewMode::TabbedView);
}
private:
QMdiArea *m_mdiArea;
};
#endif // MYWIDGET_H
Here are two problems that I am struggling with:
- How can I show the tooltip without moving my mouse when I toggle between those two tabs by
Ctrl+Tab? In my real-world problem, I use the tooltip show information about data at the mouse point. - Is it possible show some legends on the top-right corner of the viewport of the QScollArea, regardless of the positions of the scoll bars? I am trying with
paintEvent, but had difficulties get the position adjusting according to scoll bars.
