Qt

QWidget实现QDialog的exec()模态效果

scorlw 发布于

QWidget实现QDialog的exec()模态效果

要点

  1. setWindowModality(Qt::ApplicationModal);//设置Widget模态
  2. 使用 QEventLoop 实现事件循环;
  3. 重写 closeEvent ，退出事件循环;

实现

.h文件：

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#ifndef PARASETWID_H
#define PARASETWID_H

#include <QWidget>
#include <QEventLoop>
#include <QCloseEvent>

namespace Ui {
class ParaSetWid;
}

class ParaSetWid : public QWidget
{
    Q_OBJECT

public:
    explicit ParaSetWid(QWidget *parent = 0);
    ~ParaSetWid();

    int exec();

private:
    Ui::ParaSetWid *ui;

    int m_Result;
    QEventLoop *m_Loop;

protected:
    void closeEvent(QCloseEvent *event);
private slots:
    void on_OKBtn_clicked();
    void on_CanBtn_clicked();
};

#endif // PARASETWID_H

.cpp文件：

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#include "parasetwid.h"
#include "ui_parasetwid.h"

ParaSetWid::ParaSetWid(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ParaSetWid)
{
    ui->setupUi(this);
    setWindowModality(Qt::ApplicationModal);
}

ParaSetWid::~ParaSetWid()
{
    delete ui;
}

int ParaSetWid::exec()
{
    m_Result=-1;
    this->show();
    m_Loop=new QEventLoop(this);
    m_Loop->exec();
    return m_Result;
}

void ParaSetWid::closeEvent(QCloseEvent *event)
{
    if(m_Loop!=NULL)
    {
        m_Loop->exit();
    }
    event->accept();
}

void ParaSetWid::on_OKBtn_clicked()
{
    m_Result=1;
    this->close();
}

void ParaSetWid::on_CanBtn_clicked()
{
    m_Result=0;
    this->close();
}