問題描述

我已經(jīng)將 QDialog 子類化以實(shí)現(xiàn)類似于 QMessageBox 的功能(我需要它來允許自定義).它有一條短信和確定"、取消"按鈕.我正在使用 exec() 顯示對話框以使其阻塞.現(xiàn)在，當(dāng)用戶單擊確定/取消時(shí)，我如何返回真/假值?

I have subclassed QDialog to implement functionality similar to QMessageBox ( I needed this to allow for customization). It has a text message and OK, Cancel buttons. I am showing the dialog using exec() to make it blocking. Now, how do I return values of true/false when the user clicks on OK/Cancel?

我嘗試將按鈕連接到 setResult() 然后，在單擊時(shí)返回結(jié)果值，但是

I tried connecting the buttons to setResult() and then, return the result value when clicked, but

1. 單擊按鈕不會(huì)關(guān)閉對話框
2. 返回值不正確.以下是我寫的代碼.我認(rèn)為我在執(zhí)行/結(jié)果部分錯(cuò)了 - 但我不知道如何解決它.

class MyMessageBox : public QDialog {
    Q_OBJECT

private slots:

    void onOKButtonClicked() { this->setResult(QDialog::Accepted); }
    void onCancelButtonClicked() { this->setResult(QDialog::Rejected); }

public:
    MyMessageBox(QMessageBox::Icon icon, const QString& title,
        const QString& text, bool showCancelButton = true,
        QWidget* parent = 0);

    virtual void resizeEvent(QResizeEvent* e);

    QDialog::DialogCode showYourself()
    {
        this->setWindowModality(Qt::ApplicationModal);
        this->exec();
        return static_cast<QDialog::DialogCode>(this->result());
    }
};

用戶將實(shí)例化該類并調(diào)用 showYourself()，它應(yīng)該返回值并關(guān)閉(和刪除)對話框.

The user will instantiate the class and call showYourself() which is expected to return the value and also close(and delete) the dialog.

我已經(jīng)發(fā)布了部分代碼.如果您需要更多，請告訴我，我會(huì)發(fā)布完整版本.

I have posted partial code. Let me know if you need more and I will post the complete version.

推薦答案

幾點(diǎn):

1. 與其自己使用 setResult()，不如使用 QDialog::accept() 和 QDialog::r??eject().
2. 看來您沒有充分利用信號(hào)和插槽.您需要?jiǎng)?chuàng)建對話(或另一個(gè))的對象來收聽對話的信號(hào).
3. 在您的代碼中，您也沒有將信號(hào)連接到插槽.
4. 在我的修復(fù)中 onOKButtonClicked 和 onCancelButtonClicked 是不必要的.
5. 通過我的修復(fù)，您不需要 showYourself().只需調(diào)用 exec 和事件信息會(huì)流動(dòng).

1. Rather than using setResult() yourself, use QDialog::accept() and QDialog::reject().
2. It seems you are not taking full advantage of the signals and slots. You need the object which create the dialog (or another one) to listen to the signals of the dialog.
3. In your code you are not connecting signals to slots either.
4. With my fix onOKButtonClicked and onCancelButtonClicked are unnecessary.
5. With my fix you don't need showYourself(). Just call exec and with the events information will flow.

您需要在顯示對話框之前添加此代碼(this 假設(shè)它在對話框方法中):

You need to add this code before showing the dialog (this assume it is in a dialog method):

QObject::connect(acceptButton, SIGNAL(clicked()), this, SLOT(accept()));
QObject::connect(rejectButton, SIGNAL(clicked()), this, SLOT(reject()));

在調(diào)用者對象中你有

void someInitFunctionOrConstructor(){
   QObject::connect(mydialog, SIGNAL(finished (int)), this, SLOT(dialogIsFinished(int)));
}

void dialogIsFinished(int){ //this is a slot
   if(result == QDialog::Accepted){
       //do something
       return
   }
   //do another thing
}

這篇關(guān)于QDialog exec() 并獲取結(jié)果值的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！