C++ 如何在 QT 中的另一个小部件内小部件？
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How to Widget inside another widget in QT?
提问by saravanan
hi how to add widget inside widget
嗨如何在小部件内添加小部件
i created main widget, and for the main widget headerbar come from another widget. here the code below
我创建了主小部件，并且主小部件标题栏来自另一个小部件。这里是下面的代码
main.cpp
主程序
#include <QApplication>
#include "mainwindow.h"
int main(int argl,char *argv[])
{
QApplication test(argl,argv);
mainWindow *window=new mainWindow();
window->setWindowState(Qt::WindowFullScreen);
window->show();
return test.exec();
}
mainwindow.cpp
主窗口.cpp
#include "mainwindow.h"
#include <QtGui>
#include "headerbar.h"
#include <QGridLayout>
mainWindow::mainWindow(QWidget *parent) : QWidget(parent)
{
QGridLayout *layout;
headerBar *Header=new headerBar(this);
layout->addWidget(Header,0,0);
this->setLayout(layout);
}
mainWindow::~mainWindow()
{
}
headerbar.cpp
标题栏.cpp
#include "headerbar.h"
headerBar::headerBar(QWidget *parent) : QWidget(parent)
{
this->setMaximumHeight(24);
}
headerBar::~headerBar()
{
}
mainwindow.h
主窗口.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QWidget>
class mainWindow : public QWidget
{
Q_OBJECT
public:
mainWindow(QWidget *parent = 0);
~mainWindow();
signals:
public slots:
};
#endif // MAINWINDOW_H
headerbar.h
标题栏.h
#ifndef HEADERBAR_H
#define HEADERBAR_H
#include <QWidget>
class headerBar : public QWidget
{
Q_OBJECT
public:
headerBar(QWidget *parent = 0);
~headerBar();
signals:
public slots:
};
#endif // HEADERBAR_H
while compile this code no errors. but when i am trying to run it's through error "exited with code -1073741819"
编译此代码时没有错误。但是当我尝试运行它时出现错误“以代码 -1073741819 退出”
please help me to fix this issue
请帮我解决这个问题
回答by Georg Fritzsche
While you use layout, you have never created and assigned an instance to it:
当您使用 时layout，您从未为其创建和分配实例：
QGridLayout *layout; // no initialization here
headerBar *Header = new headerBar(this);
layout->addWidget(Header,0,0); // layout is uninitialized and probably garbage
You should create it first before using it:
您应该在使用它之前先创建它：
QGridLayout *layout = new QGridLayout(this);
