原文&＃xff1a;http://blog.chinaunix.net/uid-25147458-id-3325066.html
今天在QMainWindow添加控制&＃xff0c;无法显示&＃xff0c;加上布局管理器后也一样&＃xff0c;到底为何&＃xff1f;
首先&＃xff0c;对于QDialog而言&＃xff0c;添加控件过程&＃xff1a;
1、创建子窗口部件&＃xff0c;如
QRadioButton *radio1 &＃61; new QRadioButton(tr("&Radio button 1"));
2、创建一个布局
2、创建一个布局
QVBoxLayout *vbox &＃61; new QVBoxLayout;
3、将子窗口部件添加到布局中去
vbox->addWidget(radio1);
4、将布局设置到QDialog中去
this->setLayout(vbox);
这样&＃xff0c;在Qdialog就可以看到子窗口部件了&＃xff1b;但在QMainWindow中看不到&＃xff1f;&＃xff1f;&＃xff1f;
求助google、百度&＃xff0c;从QT Assistant 中找到这句话&＃xff1a;
Note: Creating a main window without a central widget is not supported. You must have a central widget even if it is just a placeholder.
原来mainwindow必须要有个centralWidget.于是便给他一个widget。示例代码如下&＃xff1a;
QWidget *centerWindow &＃61; new QWidget;
this->setCentralWidget(centerWindow);
button1 &＃61; new QPushButton("One");
button2 &＃61; new QPushButton("Two");
button3 &＃61; new QPushButton("Three");
button4 &＃61; new QPushButton("Four");
button5 &＃61; new QPushButton("Five");
Note: Creating a main window without a central widget is not supported. You must have a central widget even if it is just a placeholder.
原来mainwindow必须要有个centralWidget.于是便给他一个widget。示例代码如下&＃xff1a;
QWidget *centerWindow &＃61; new QWidget;
this->setCentralWidget(centerWindow);
button1 &＃61; new QPushButton("One");
button2 &＃61; new QPushButton("Two");
button3 &＃61; new QPushButton("Three");
button4 &＃61; new QPushButton("Four");
button5 &＃61; new QPushButton("Five");
layout &＃61; new QVBoxLayout;
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
QGroupBox *groupBox &＃61; new QGroupBox(tr("登录"));
groupBox->setLayout(layout);
QVBoxLayout *mainLayout &＃61; new QVBoxLayout;
mainLayout->addWidget(groupBox);
centerWindow->setLayout(mainLayout);
groupBox->setLayout(layout);
QVBoxLayout *mainLayout &＃61; new QVBoxLayout;
mainLayout->addWidget(groupBox);
centerWindow->setLayout(mainLayout);
京公网安备 11010802041100号