Qt在菜单项单击时显示模式对话框(.ui) [英] Qt show modal dialog (.ui) on menu item click

问题描述

我想制作一个简单的关于"模式对话框，从帮助->关于应用程序菜单中调用.我用 QT Creator(.ui 文件)创建了一个模态对话框窗口.

I want to make a simple 'About' modal dialog, called from Help->About application menu. I've created a modal dialog window with QT Creator (.ui file).

菜单关于"插槽中应包含什么代码?

What code should be in menu 'About' slot?

现在我有了这段代码，但它显示了一个新的模式对话框(不是基于我的 about.ui):

Now I have this code, but it shows up a new modal dialog (not based on my about.ui):

void MainWindow::on_actionAbout_triggered()
{
    about = new QDialog(0,0);
    about->show();
}

谢谢！

推荐答案

您需要使用 .ui 文件中的 UI 设置对话框.Qt uic 编译器从您的 .ui 文件生成一个头文件，您需要将其包含在代码中.假设你的.ui文件名为about.ui，Dialog名为About，则uic创建文件 ui_about.h，包含一个类 Ui_About.有不同的方法来设置你的 UI，最简单的你可以这样做

You need to setup the dialog with the UI you from your .ui file. The Qt uic compiler generates a header file from your .ui file which you need to include in your code. Assumed that your .ui file is called about.ui, and the Dialog is named About, then uiccreates the file ui_about.h, containing a class Ui_About. There are different approaches to setup your UI, at simplest you can do

#include "ui_about.h"

...

void MainWindow::on_actionAbout_triggered()
{
    about = new QDialog(0,0);

    Ui_About aboutUi;
    aboutUi.setupUi(about);

    about->show();
}

更好的方法是使用继承，因为它可以更好地封装您的对话框，以便您可以在子类中实现特定于特定对话框的任何功能:

A better approach is to use inheritance, since it encapsulates your dialogs better, so that you can implement any functionality specific to the particular dialog within the sub class:

AboutDialog.h:

#include <QDialog>
#include "ui_about.h"

class AboutDialog : public QDialog, public Ui::About {
    Q_OBJECT

public:
    AboutDialog( QWidget * parent = 0);
};

关于Dialog.cpp:

AboutDialog::AboutDialog( QWidget * parent) : QDialog(parent) {

    setupUi(this);

    // perform additional setup here ...
}

用法:

#include "AboutDialog.h"

...

void MainWindow::on_actionAbout_triggered() {
    about = new AboutDialog(this);
    about->show();
}

无论如何，重要的代码是调用setupUi()方法.

In any case, the important code is to call the setupUi() method.

顺便说一句:上面代码中的对话框是非模态的.要显示模式对话框，请将对话框的 windowModality 标志设置为 Qt::ApplicationModal 或使用 exec() 而不是 显示().

BTW: Your dialog in the code above is non-modal. To show a modal dialog, either set the windowModality flag of your dialog to Qt::ApplicationModal or use exec() instead of show().

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