[QT]QT教程之实例分析[一]文件 颜色和字体对话框

重点知识已近在代码里注释...

请仔细看代码

本文原创

转载请保留此链接 http://blog.csdn.net/siren0203

头文件

standardialog .h

#ifndef STANDARDIALOG_H
#define STANDARDIALOG_H
#include <QObject>
#include <QDialog>
class QGridLayout;
class QPushButton;
class QLineEdit;
class QFrame;
class standardialog:public QDialog{
    Q_OBJECT
public:
    //构造函数
    standardialog(QWidget *parent=0);
    //私有成员
private:
    QGridLayout *gridLayout;
    QPushButton *fontButton;
    QPushButton *colorButton;
    QPushButton *fileButton;
    QLineEdit *fileLineEdit;
    QLineEdit *fontLineEdit;
    QFrame *colorFrame;
private slots:
    void slotOpenFileDlg();
    void slotOpenColorDlg();
    void slotOpenFontDlg();
};

#endif // STANDARDIALOG_H

在看 main.cpp

#include <QDialog>
#include <QApplication>
#include <QGridLayout>
#include <QPushButton>
#include <QLineEdit>
#include <QFileDialog>
#include <QFontDialog>
#include <QColorDialog>
#include "standardialog.h"

standardialog::standardialog(QWidget *parent):QDialog(parent){
            
    //设置窗口标题
        setWindowTitle("StanDarDialog");
        //实例化布局管理器
        gridLayout=new QGridLayout(this);
        //设置按钮和输入框
        fontButton=new QPushButton("font Button");
        fileButton =new QPushButton("file Button");
        colorButton=new QPushButton("color Button");
        fileLineEdit=new QLineEdit(this);
        fontLineEdit=new QLineEdit(this);
        fontLineEdit->setText("font line edit");
        //实例一个框架 FRAME
        colorFrame =new QFrame;
        colorFrame->setFrameShape(QFrame::Box);
        colorFrame->setAutoFillBackground(true);

        gridLayout->addWidget(fileButton,0,0);
        gridLayout->addWidget(fileLineEdit,0,1);

        gridLayout->addWidget(colorButton,1,0);
        gridLayout->addWidget(colorFrame,1,1);

        gridLayout->addWidget(fontButton,2,0);
        gridLayout->addWidget(fontLineEdit,2,1);

        //设置间距
        gridLayout->setMargin(5);
        gridLayout->setSpacing(10);
        //关联信号和槽
        connect(fontButton,SIGNAL(clicked()),this,SLOT(slotOpenFontDlg()));
        connect(fileButton,SIGNAL(clicked()),this,SLOT(slotOpenFileDlg()));
        connect(colorButton,SIGNAL(clicked()),this,SLOT(slotOpenColorDlg()));
        //设置布局管理器
        setLayout(gridLayout);
}
//颜色 对话框
void standardialog::slotOpenColorDlg(){
    QColor color=QColorDialog::getColor();
    if(color.isValid()){
        colorFrame->setPalette(QPalette(color));
    }
}
//文件对话框
void standardialog::slotOpenFileDlg(){
    QString filename=QFileDialog::getOpenFileName(this,"open this dialog","/");
    fileLineEdit->setText(filename.toAscii());
}
//字体对话框
void standardialog::slotOpenFontDlg(){
    bool ok;
    QFont font=QFontDialog::getFont(&ok);
    if(ok){
        fontLineEdit->setFont(font);
    }
}

int main(int argc,char ** argv){
    QApplication app(argc,argv);
    standardialog dialog;
    dialog.show();
    return app.exec();
}

效果.