我不知道您的整个代码,但是根据文档,这个想法或多或少与您所说的相同:连接信号的插槽QProgressDialog::canceled()
。
以下代码只是一个示例,但它正在工作。在这种情况下,不是使用自己的 Qt 属性wasCanceled,而是使用布尔值来控制何时停止和取消QProgressDialog
.
对话框.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
class QProgressDialog;
QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
~Dialog();
private slots:
void on_pushButton_clicked();
void my_custom_cancel();
private:
Ui::Dialog *ui;
QProgressDialog *progress;
int numTasks = 100000;
bool canceled = false;
};
#endif // DIALOG_H
对话框.cpp
#include "dialog.h"
#include "ui_dialog.h"
#include <QProgressDialog>
#include <QThread>
#include <QDebug>
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
, ui(new Ui::Dialog)
{
progress = new QProgressDialog("Task in progress...", "Cancel", 0, numTasks);
connect(progress, SIGNAL(canceled()), this, SLOT(my_custom_cancel()));
ui->setupUi(this);
}
Dialog::~Dialog()
{
delete ui;
}
void Dialog::on_pushButton_clicked()
{
progress->open();
for (int i = 0; i < numTasks; i++) {
progress->setValue(i);
QThread::usleep(100);
if (canceled)
break;
}
progress->setValue(numTasks);
}
void Dialog::my_custom_cancel()
{
qDebug() << "do something";
canceled = true;
}