Qt: The child dialog moves with the parent dialog (no delay) - c++

Question

I have a child dialog and a parent dialog. I want the child dialog to follow the parent dialog to move;
my current plan is to override moveEvent（） in the parent dialog, but the effect is not good: the child dialog moves delay. Is there a better solution？
Update:
platform:macos
atomwindow.h
class atomwindow : public QDialog
{
Q_OBJECT
public:
explicit atomwindow(QDialog *parent = nullptr);
~atomwindow();
protected:
virtual void moveEvent(QMoveEvent *) override;
private:
Ui::atomwindow *ui;
PeriodicTable *table;
bool tableshown = false;
};
atomwindow.cpp
void atomwindow::ShowTable(){
table = new PeriodicTable(this);
table->SetShowPos(windowpos, button_2pos, button_2height, button_2width);
tableshown = true;
table->exec();
}
void atomwindow::moveEvent(QMoveEvent *event){
if(tableshown){
table->MovePos(windowpos, button_2pos, button_2height, button_2width);
}
}
periodictable.h
class PeriodicTable : public QDialog
{
Q_OBJECT
public:
explicit PeriodicTable(QWidget *parent = nullptr);
~PeriodicTable();
void SetShowPos(QPoint, QPoint, int, int);
void MovePos(QPoint, QPoint, int, int);
private:
Ui::PeriodicTable *ui;
};
periodictable.cpp
void PeriodicTable::SetShowPos(QPoint parentpos, QPoint point, int buttonheight, int buttonwidth){
this->setGeometry(curpoint.x(), curpoint.y(), width, height);
}
void PeriodicTable::MovePos(QPoint parentpos, QPoint point, int buttonheight, int buttonwidth){
this->move(curpoint);
}

Answer 1

Dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE
class SubDialog;
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
~Dialog();
protected:
void moveEvent(QMoveEvent *event);
signals:
void signalMove( const QPoint &, const QPoint & );
private:
SubDialog *sub;
Ui::Dialog *ui;
};
#endif // DIALOG_H
Dialog.cpp
#include "Dialog.h"
#include "SubDialog.h"
#include <QMoveEvent>
#include "ui_Dialog.h"
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
, ui(new Ui::Dialog)
{
ui->setupUi(this);
sub = new SubDialog;
connect( this, &Dialog::signalMove, sub, &SubDialog::slotMove );
sub->show();
}
Dialog::~Dialog()
{
delete sub;
delete ui;
}
void Dialog::moveEvent(QMoveEvent *event)
{
emit signalMove( event->pos(), event->oldPos() );
}
SubDialog.h
#ifndef SUBDIALOG_H
#define SUBDIALOG_H
#include <QDialog>
namespace Ui {
class SubDialog;
}
class SubDialog : public QDialog
{
Q_OBJECT
public:
explicit SubDialog(QWidget *parent = nullptr);
~SubDialog();
public slots:
void slotMove( const QPoint &, const QPoint & );
private:
Ui::SubDialog *ui;
};
#endif // SUBDIALOG_H
SubDialog.cpp
#include "SubDialog.h"
#include "ui_SubDialog.h"
SubDialog::SubDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::SubDialog)
{
ui->setupUi(this);
}
SubDialog::~SubDialog()
{
delete ui;
}
void SubDialog::slotMove( const QPoint &newPos, const QPoint &oldPos )
{
auto x = newPos.x() - oldPos.x();
auto y = newPos.y() - oldPos.y();
QPoint pos( this->pos().x() + x, this->pos().y() + y );
move( pos );
}
main.cpp
#include "Dialog.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
w.show();
return a.exec();
}