标签：com blog class div code c log t sp ext string
顾名思义，消息框的作用是给用户提供一些提醒或一些简单的询问。主要由QMessageBox类实现，qt提供的这个消息框类基本涵盖了开发应用中使用的各种情况，并且提供了自定义消息框的方式，满足各种特殊的需求，在实际应用中关键是分析实际的应用需求，根据不同的应用环境选择最合适的消息框，以使程序简洁而合理。
这一次，书中连类的实现都没有，只给了一些函数接口，以后会怎么样呢？画面太残暴不敢想。
学习过程中又有了一些小收获，如qt自带的帮助文档，非常全面，当鼠标放在某个qt类的名称时，按F1就会弹出此类的说明文档，十分便捷。
代码：
// messagebox.h#ifndef MESSAGEBOX_H#define MESSAGEBOX_H#include <QPushButton>#include <QLabel>#include <QGridLayout>#include <QMessageBox>#include <QDialog>class
messagebox: public
QDialog // 必须加上public QDialog，因为要从QDialog类中继承很多内容{ Q_OBJECTpublic: messagebox(); ~messagebox();public: QLabel *label; QPushButton *quest; QPushButton *info; QPushButton *warn; QPushButton *crtcal; QPushButton *about; QPushButton *aboutQt; QPushButton *custom; QGridLayout *layout;private
slots: void
slotQuestion(); void
slotInformation(); void
slotWarning(); void
slotCritical(); void
slotAbout(); void
slotAboutQt(); void
slotCustom();};#endif // MESSAGEBOX_H// messagebox.cpp#include "messagebox.h"messagebox::messagebox(){ // 创建元素 label = new
QLabel; label->setText(tr("About Qt Message Box")); quest = new
QPushButton; quest->setText(tr("Question")); info = new
QPushButton; info->setText(tr("Information")); warn = new
QPushButton; warn->setText(tr("Warning")); crtcal = new
QPushButton; crtcal->setText(tr("Critical")); about = new
QPushButton; about->setText(tr("About")); aboutQt = new
QPushButton; aboutQt->setText(tr("About Qt")); custom = new
QPushButton; custom->setText(tr("custom")); layout = new
QGridLayout(this); // 最初没有加上this，显示只有一个空白的方框，下列元素没有显示在其中。 // 布局 layout->addWidget(label, 0, 0); layout->addWidget(quest, 0 , 1); layout->addWidget(info, 1, 1); layout->addWidget(warn, 1, 0); layout->addWidget(crtcal, 2, 1); layout->addWidget(about, 2, 0); layout->addWidget(aboutQt, 3, 1); layout->addWidget(custom, 3, 0); // 连接槽 connect(quest, SIGNAL(clicked()), this, SLOT(slotQuestion()) ); connect(about, SIGNAL(clicked()), this, SLOT(slotAbout())); connect(aboutQt, SIGNAL(clicked()), this, SLOT(slotAboutQt())); connect(info, SIGNAL(clicked()), this, SLOT(slotInformation())); connect(warn, SIGNAL(clicked()), this, SLOT(slotWarning())); connect(crtcal, SIGNAL(clicked()), this, SLOT(slotCritical())); connect(custom, SIGNAL(clicked()), this, SLOT(slotCustom()));}messagebox::~messagebox(){ delete
label; delete
layout; delete
quest; delete
about; delete
aboutQt; delete
info; delete
warn; delete
crtcal; delete
custom;}void
messagebox::slotQuestion(){ switch(QMessageBox::question(this, "Question",tr("It‘s end of document, search from begin?"), QMessageBox::Ok|QMessageBox::Cancel, QMessageBox::Ok)) { case
QMessageBox::Ok: label->setText("Question button /Ok"); break; case
QMessageBox::Cancel: label->setText("Question button/ Cancel"); break; default: break; } return
; // 这句有没有，并无影响}void
messagebox::slotInformation(){ QMessageBox::information(this, "Information", tr("anything you want tell user")); return
;}void
messagebox::slotWarning(){ switch(QMessageBox::warning(this, "Warning", tr("Save changes to document?"), QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel, QMessageBox::Save)) { case
QMessageBox::Save: label->setText("Warning button /Save"); break; case
QMessageBox::Discard: label->setText("Warning button/ Discard"); break; case
QMessageBox::Cancel: label->setText("Warning button/ Cancel"); break; default: break; } return
;}void
messagebox::slotCritical(){ QMessageBox::critical(this, "Information", tr("tell user a critical error")); label->setText("Critical MessageBox"); return;}void
messagebox::slotAbout(){ QMessageBox::about(this, "About", tr("Message box example")); label->setText("About MessageBox"); return
;}void
messagebox::slotAboutQt(){ QMessageBox::aboutQt(this, "About Qttttttt"); // 设置消息框名称 label->setText("About Qt MessageBox"); return
;}void
messagebox::slotCustom(){ QMessageBox customMsgBox; // 用鼠标点QMessageBOx, 然后按F1， 将出现QMessageBox的内部说明文档 customMsgBox.setWindowTitle("Custom message box"); QPushButton *lockButton = customMsgBox.addButton(tr("Lock"), QMessageBox::ActionRole); QPushButton *unlockButton = customMsgBox.addButton(tr("Unlock"), QMessageBox::ActionRole); QPushButton *cancelButton = customMsgBox.addButton( QMessageBox::Cancel); customMsgBox.setIconPixmap(QPixmap("")); customMsgBox.setText("This is a custom message box"); customMsgBox.exec(); if(customMsgBox.clickedButton() == lockButton) label->setText("Custom MessageBox /Lock"); if(customMsgBox.clickedButton() == unlockButton) label->setText("Custom MessageBox/ Unlock"); if(customMsgBox.clickedButton() == cancelButton) label->setText("Custom MessageBox/Cancel"); return
;}// main.cpp#include <QApplication>#include <QPushButton>#include <QLabel>#include "standarddialogs.h"#include "geometry.h"#include "inputdialog.h"#include "messagebox.h"int
main(int
argc, char
*argv[]){ QApplication a(argc, argv); // StandardDialogs ct; // ct.show(); // QPushButton b("Hello World!"); // b.show(); // QObject::connect(&b, SIGNAL(clicked()), &a, SLOT(quit())); // Geometry my; // my.show(); // InputDlg person; // person.show(); messagebox msgb; msgb.show(); return
a.exec();} |
【qt学习003】渐入佳境——各种标准消息框的使用,布布扣,bubuko.com
标签：com blog class div code c log t sp ext string
原文地址：http://www.cnblogs.com/xy-kidult/p/3701202.html
