2_按钮&对象数.md

按钮

#include "mywidget.h"
#include <qpushbutton.h>

MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
{
    // first button
    QPushButton *btn = new QPushButton;
	//    btn->show();
    btn->setParent(this);
    btn->setText("第一个按钮");

    // second button, same as first
    QPushButton *btn2 = new QPushButton("second button", this);
    // reset windows size
    resize(800, 600);
    // move button
    btn2->move(100, 100);

    // set window title
    setWindowTitle("First Windows");
    // set fixed size
    setFixedSize(800, 400);

}

MyWidget::~MyWidget()
{
}

对象树

QObject的子类会自动析构