异度部落格

#include <QtGui/QApplication>
#include<QSpinBox>
#include<QSlider>
#include<QHBoxLayout>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //创建一个小窗体部件
    QWidget *widget=new QWidget;
    widget->setWindowTitle("input your age");
    //创建一个QSpinBox，并设置范围0-130
    QSpinBox *spinBox=new QSpinBox;
    spinBox->setRange(0,130);
    //创建一个QSlider，并设置范围0-130
    QSlider *slider=new QSlider(Qt::Horizontal);
    slider->setRange(0,130);
    //设置信号和槽
    QObject::connect(spinBox,SIGNAL(vauleChanged(int)),slider,SLOT(setValue(int)));
    QObject::connect(slider,SIGNAL(valueChanged(int)),spinBox,SLOT(setValue(int)));
    //初始值
    spinBox->setValue(0);
    //布局设置
    QHBoxLayout *layout=new QHBoxLayout;
    layout->addWidget(spinBox);
    layout->addWidget(slider);
    widget->setLayout(layout);
    widget->show();
    return a.exec();
}

#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QtGui/QDialog>
#include<QCheckBox>
#include<QLabel>
#include<QLineEdit>
#include<QPushButton>
namespace Ui
{
    class FindDialogClass;
}
class FindDialog : public QDialog
{
    Q_OBJECT
public:
    FindDialog(QWidget *parent = 0);
    ~FindDialog();
signals:
    void findNext(const QString &amp;str,Qt::CaseSensitivity cs);  //不要写成 Qt::CaseSensitive,Qt::CaseSensitivity是一个类型
    void findPrev(const QString &amp;str,Qt::CaseSensitivity cs);
private slots:
    void findClicked();
    void enableFindButton(const QString &amp;text);
private:
    Ui::FindDialogClass *ui;
    QLabel *label;
    QLineEdit *lineEdit;
    QCheckBox *caseCheckBox;
    QCheckBox *backwardCheckBox;
    QPushButton *findButton;
    QPushButton *closeButton;
};
#endif // FINDDIALOG_H

#include<QtGui>
#include<QHBoxLayout>
#include "finddialog.h"
#include "ui_finddialog.h"
FindDialog::FindDialog(QWidget *parent)
    : QDialog(parent), ui(new Ui::FindDialogClass)
{
    ui->setupUi(this);
    //对部件进行定义
    label=new QLabel(tr("&amp;Input the word you want to find"));
    lineEdit=new QLineEdit();
    label->setBuddy(lineEdit);  //setBuddy 当按下快捷键时，转换到lineEdit
    caseCheckBox=new QCheckBox(tr("Match &amp;Case"));
    backwardCheckBox=new QCheckBox(tr("Search &amp;backward"));
    findButton=new QPushButton(tr("Find"));
    closeButton=new QPushButton(tr("Close"));
    //添加信号连接
    connect(lineEdit,SIGNAL(textChanged(const QString &amp;)),this,SLOT(enableFindButton(const QString &amp;)));
    connect(findButton,SIGNAL(clicked()),this,SLOT(findClicked()));
    connect(closeButton,SIGNAL(clicked()),this,SLOT(close()));
    //布局控制
    QHBoxLayout *topLeftLayout=new QHBoxLayout;
    topLeftLayout->addWidget(label);
    topLeftLayout->addWidget(lineEdit);
    QVBoxLayout *leftLayout=new QVBoxLayout;
    leftLayout->addLayout(topLeftLayout);   //添加topLeftLayout层到leftLayout层上
    leftLayout->addWidget(caseCheckBox);
    leftLayout->addWidget(backwardCheckBox);
    QVBoxLayout *rightLayout=new QVBoxLayout;
    rightLayout->addWidget(findButton);
    rightLayout->addWidget(closeButton);
    rightLayout->addStretch();   //添加延展
    //设置mianLayout将leftLayout和rightLayout添加到上面
    QHBoxLayout *mainLayout=new QHBoxLayout;
    mainLayout->addLayout(leftLayout);
    mainLayout->addLayout(rightLayout);
    this->setLayout(mainLayout);
    this->setWindowTitle(tr("Find"));
    this->setFixedHeight(sizeHint().height());
}
FindDialog::~FindDialog()
{
    delete ui;
}
void FindDialog::findClicked()
{
    QString text=lineEdit->text();
    Qt::CaseSensitivity cs=caseCheckBox->isChecked()?Qt::CaseSensitive : Qt::CaseInsensitive;
    if(backwardCheckBox->isChecked())
        emit findPrev(text,cs);     //emit用于发射信号
    else emit findNext(text,cs);
}
void FindDialog::enableFindButton(const QString &amp;text)
{
    findButton->setEnabled(!text.isEmpty());
}

#include <QtGui/QApplication>
#include "finddialog.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    FindDialog *findDialog=new FindDialog;
    findDialog->show();
    return app.exec();
}

#include <QtGui/QApplication>
#include<QLabel>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QLabel *label=new QLabel("Hello World");
    label->show();
    return a.exec();
}