Question

我在Qt Ctreator中创建了一个包含5个窗口的MDI区域的ui文件。如您所见，在打开主窗口之后，所有子窗口也都将出现。我想先隐藏或关闭所有这些，然后再单击工具栏按钮以显示所需的窗口。但是我无法成功，为什么哪一个是错误的？

main.cpp

#include "mymainwindow.h"
#include <QApplication>
#include <QMenu>
#include <QMdiArea>
#include <QMdiSubWindow>
#include <QMainWindow>

#include <iostream>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyMainWindow w;
    w.show();

    return a.exec();
}


mymainwindow.cpp

#include "mymainwindow.h"
#include "ui_mymainwindow.h"
#include "iostream"
#include "QMdiSubWindow"

MyMainWindow::MyMainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MyMainWindow)
{
    ui->setupUi(this);
    //this->ui->mdiArea->closeAllSubWindows();
    ui->mdiArea->hide();
}

MyMainWindow::~MyMainWindow()
{
    setAttribute(Qt::WA_DeleteOnClose);
    delete ui;
}

void MyMainWindow::on_tool_btn_action_Cari_triggered()
{
    std::cout<<"Toolbar click is working!"<<std::endl;
    statusBar()->showMessage(tr("Cari Window"));
    ui->mdiArea->addSubWindow(ui->subwin_Cari);
    ui->subwin_Cari->activateWindow();
    ui->subwin_Cari->show();

}


mymainwindow.h

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MyMainWindow;
}

class MyMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MyMainWindow(QWidget *parent = nullptr);
    ~MyMainWindow();

//private slots:
//    void on_pushButton_clicked();

private slots:
    void on_tool_btn_action_Cari_triggered();

private:
    Ui::MyMainWindow *ui;
};

#endif // MYMAINWINDOW_H


Test14.pro

#-------------------------------------------------
#
# Project created by QtCreator 2018-07-30T23:11:33
#
#-------------------------------------------------

QT       += core gui widgets

TARGET = Test14
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

CONFIG += c++11

QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

SOURCES += \
        main.cpp \
        mymainwindow.cpp \

HEADERS += \
        mymainwindow.h \

FORMS += \
        mymainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    resources.qrc

C ++在QMdiArea中显示子窗口

0 个答案: