Qt创建状态栏和Qlabel的问题

void MainWindow::createStatusBar()

{

locationLabel = new QLabel(" W999 ")//以文字" W999 " 建立 一个新的QLabel的对象

locationLabel->setAlignment(Qt::AlignHCenter)//文字对齐方式为中间对齐

locationLabel->setMinimumSize(locationLabel->sizeHint())

//设置这个Label的最小大小为当前最适合的大小。即Label的最小面积就是现在的大小了

formulaLabel = new QLabel

formulaLabel->setIndent(3)

//设置自动缩进

statusBar()->addWidget(locationLabel)

statusBar()->addWidget(formulaLabel, 1)

//第二个参数是设置 窗体 伸张系数的，默认为0.

connect(spreadsheet, SIGNAL(currentCellChanged(int, int, int, int)),

this, SLOT(updateStatusBar()))

connect(spreadsheet, SIGNAL(modified()),

this, SLOT(spreadsheetModified()))

updateStatusBar()

}

#ifndef WIDGET_H

#define WIDGET_H

#include <QtGui/QWidget>

#include <QPushButton>

#include <QLabel>

#include <QHBoxLayout>

class Widget : public QWidget

{

Q_OBJECT

public:

Widget(QWidget *parent = 0)

~Widget()

QPushButton *clearNO,*addNO

QLabel *label

QHBoxLayout *qhboxlayout

private slots:

void clearNOhandle()

void addNOhandle()

}

#endif // WIDGET_H

///////////widget.cpp

#include "widget.h"

Widget::Widget(QWidget *parent)

: QWidget(parent)

{

clearNO =new QPushButton("CLEAR")

addNO =new QPushButton("ADD")

label =new QLabel("0")

qhboxlayout =new QHBoxLayout(this)

qhboxlayout->addWidget(label)

qhboxlayout->addWidget(clearNO)

qhboxlayout->addWidget(addNO)

connect(clearNO,SIGNAL(clicked()),this,SLOT(clearNOhandle()))

connect(addNO,SIGNAL(clicked()),this,SLOT(addNOhandle()))

}

void Widget::addNOhandle(){

QString nostr

int no

nostr = label->text()

no = nostr.toInt()

no++

nostr.setNum(no)

label->setText(nostr)

}

////////main函数

void Widget::clearNOhandle(){

label->setText("0")

}

Widget::~Widget()

{

}

#include <QtGui/QApplication>

#include "widget.h"

int main(int argc, char *argv[])

{

QApplication a(argc, argv)

Widget w

w.show()

return a.exec()

}

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