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第52课 命令行参数的应用
1.主窗口的状态参数
（1）主窗口的状态参数：如位置、大小
（2）应用程序退出的过程
①收到关闭事件
②执行关闭事件处理函数（在这里进行主窗口的状态保存）
③主窗口从屏幕上消失
④主窗口的析构函数的执行
（3）保存主窗口状态参数的时机
①一般而言：应用程序收到关闭事件时进行状态参数的保存
②Qt的解决方案：重写关闭事件处理函数并在其中保存状态参数
2. 命令行参数的应用
（1）每个应用程序都能够接收命令行参数。
（2）命令行参数传递到应用程序
①传统方式：在命令行启动GUI程序时传递参数，如notepad.exe test.txt
②操作系统关联方式：在文件被双击时，操作系统根据文件后缀选择应用程序，并将文件路径作为命令行参数启动应用程序
【编程实验】主窗口的状态参数和处理命令行参数
//main.cpp
#include "MainWindow.h" #include <QApplication> #include <QFileInfo> int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow* w = MainWindow::NewInstance(); int ret = -1; if(w != NULL) { if(argc > 1) { QFileInfo fi(argv[1]); if(fi.exists()) { w->openFile(fi.absoluteFilePath()); } } w->show(); ret = a.exec(); } delete w; return ret; }
//FontDialog.h(cpp)、ReplaceDialog.h(cpp)、AboutDialog.h(cpp)与上例相同
//AppConfig.h
#ifndef _APPCONFIG_H_ #define _APPCONFIG_H_ #include <QObject> #include <QFont> #include <QPoint> #include <QSize> class AppConfig : public QObject { Q_OBJECT QFont m_editorFont; QSize m_mainWindowSize; QPoint m_mainWindowPosition; bool m_isAutoWrap; bool m_isToolBarVisible; bool m_isStatusBarVisible; bool m_isValid; bool restore(); public: explicit AppConfig(QObject *parent = 0); explicit AppConfig(QFont font, QPoint position, QSize size, bool isWrap, bool tbVisible, bool sbVisible, QObject* parent = 0); bool store(); QFont editorFont(); QSize mainWindowSize(); QPoint mainWindowPosition(); bool isAutoWrap(); bool isToolBarVisible(); bool isStatusBarVisible(); bool isValid(); }; #endif // _APPCONFIG_H_
//AppConfig.cpp
#include "AppConfig.h" #include <QFile> #include <QDataStream> #include <QApplication> #define FILENAME "app.config" AppConfig::AppConfig(QObject *parent) : QObject(parent) { m_isValid = restore(); } AppConfig::AppConfig(QFont font, QPoint position, QSize size, bool isWrap, bool tbVisible, bool sbVisible, QObject* parent):QObject(parent) { m_editorFont = font; m_mainWindowPosition = position; m_mainWindowSize = size; m_isAutoWrap = isWrap; m_isToolBarVisible = tbVisible; m_isStatusBarVisible = sbVisible; m_isValid = true; } bool AppConfig::restore() { bool ret = false; QFile file(QApplication::applicationDirPath() + "/" + FILENAME); if(file.open(QIODevice::ReadOnly)) { QDataStream in(&file); in.setVersion(QDataStream::Qt_5_6); in >> m_editorFont; in >> m_mainWindowPosition; in >> m_mainWindowSize; in >> m_isAutoWrap; in >> m_isToolBarVisible; in >> m_isStatusBarVisible; file.close(); ret = true; } return ret; } bool AppConfig::store() { bool ret = false; QFile file(QApplication::applicationDirPath() + "/" + FILENAME); if(file.open(QIODevice::WriteOnly)) { QDataStream out(&file); out.setVersion(QDataStream::Qt_5_6); out << m_editorFont; out << m_mainWindowPosition; out << m_mainWindowSize; out << m_isAutoWrap; out << m_isToolBarVisible; out << m_isStatusBarVisible; file.close(); ret = true; } return ret; } QFont AppConfig::editorFont() { return m_editorFont; } QSize AppConfig::mainWindowSize() { return m_mainWindowSize; } QPoint AppConfig::mainWindowPosition() { return m_mainWindowPosition; } bool AppConfig::isAutoWrap() { return m_isAutoWrap; } bool AppConfig::isToolBarVisible() { return m_isToolBarVisible; } bool AppConfig::isStatusBarVisible() { return m_isStatusBarVisible; } bool AppConfig::isValid() { return m_isValid; }
//MainWindow.h
#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include <QMenuBar> //#include <QKeySequence> //#include <QAction> #include <QPlainTextEdit> #include <QLabel> #include <QFileDialog> #include <QSharedPointer> #include "FindDialog.h" #include "ReplaceDialog.h" class MainWindow : public QMainWindow { Q_OBJECT private: QPlainTextEdit mainEditor; QLabel statusLbl; QString m_filePath;//当前操作的文件路径 bool m_isTextChanged; //标识编辑框中的内容是否改变 QSharedPointer<FindDialog> m_pFindDlg;//组合关系，利用智能指针来管理其生命周期 QSharedPointer<ReplaceDialog> m_pRelaceDlg; //将构造函数、复制构造、赋值函数等私有化 MainWindow(QWidget *parent = 0); MainWindow(const MainWindow&); MainWindow& operator= (const MainWindow&); bool construct(); //二阶构造模式 bool initMenuBar(); //初始化菜单栏 bool initToolBar(); //初始化工具栏 bool initStatusBar(); //初始化状态栏 bool initMainEditor();//初始化文本编辑组件 //菜单设置 bool initFileMenu(QMenuBar* mb); //“文件”菜单 bool initEditMenu(QMenuBar* mb); //“编辑”菜单 bool initFormatMenu(QMenuBar* mb); //“格式”菜单 bool initViewMenu(QMenuBar* mb); //“查看”菜单 bool initHelpMenu(QMenuBar* mb); //“帮助”菜单 //工具栏设置 bool initFileToolItem(QToolBar* tb); bool initEditToolItem(QToolBar* tb); bool initFormatToolItem(QToolBar* tb); bool initViewToolItem(QToolBar* tb); //生成菜单项 bool makeAction(QAction*& action, QWidget* parent, QString text, int key); //生成工具栏中的各按钮 bool makeAction(QAction*& action, QWidget* parent, QString tip, QString icon); QString showFileDialog(QFileDialog::AcceptMode mode, QString title);//显示打开和保存对话框 void showErrorMessage(QString message);//显示“错误对话框”(QMessagBox) int showQueryMessage(QString message); //显示“询问对话框” QString saveCurrentData(QString path = "", QString title = "Save"); //保存编辑框中的内容 void preEditorChanged(); //判断文本框是否被更改，并决定是否弹出“保存对话框” void openFileToEditor(QString path); QAction* findMenuBarAction(QString text); QAction* findToolBarAction(QString text); protected: void closeEvent(QCloseEvent *e); //重写窗体的关闭事件 void dragEnterEvent(QDragEnterEvent* e); void dropEvent(QDropEvent * e); private slots: void onFileNew(); void onFileOpen(); void onFileSave(); void onFileSaveAs(); void onFilePrint(); void onFileExit(); void onTextChanged();//文本框内容发生改变里，会收到textChanged信号，这里是接收该信号的槽函数 void onCopyAvailable(bool available); void onRedoAvailable(bool available); void onUndoAvailable(bool available); void onCursorPositionChanged(); void onEditDelete(); void onEditFind(); void onEditReplace(); void onEditGoto(); void onFormatFont(); void onFormatWrap(); void onViewToolBar(); void onViewStatusBar(); void onHelpAbout(); void onHelpManual(); public: static MainWindow* NewInstance(); QToolBar* toolBar(); void openFile(QString path); ~MainWindow(); }; #endif // MAINWINDOW_H
//MainWindowUI.cpp
#include "MainWindow.h" #include "AppConfig.h" #include <QMenu> #include <QToolBar> #include <QStatusBar> #include <QLabel> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), m_pFindDlg(new FindDialog(this,&mainEditor)), m_pRelaceDlg(new ReplaceDialog(this, &mainEditor)) { setWindowTitle("NotePad - [ New ]"); mainEditor.setAcceptDrops(false);//默认下，QPlainTextEdit是接收拖放事件的 //其父对象会收不到“拖放”事件，这里设为false setAcceptDrops(true); //由MainWindow来接管拖放事件 m_filePath = ""; m_isTextChanged = false; } //二阶构造中的第2阶构造 bool MainWindow::construct() { bool ret = true; AppConfig config; ret = ret && initMenuBar(); ret = ret && initToolBar(); ret = ret && initStatusBar(); ret = ret && initMainEditor(); if(config.isValid()) { mainEditor.setFont(config.editorFont()); //不自动换行 if(!config.isAutoWrap()) { mainEditor.setLineWrapMode(QPlainTextEdit::NoWrap); findMenuBarAction("Auto Wrap")->setChecked(false); findToolBarAction("Auto Wrap")->setChecked(false); } //隐藏工具栏 if(!config.isToolBarVisible()) { toolBar()->setVisible(false); findMenuBarAction("Tool Bar")->setChecked(false); findToolBarAction("Tool Bar")->setChecked(false); } //隐藏状态栏 if(!config.isStatusBarVisible()) { statusBar()->setVisible(false); findMenuBarAction("Status Bar")->setChecked(false); findToolBarAction("Status Bar")->setChecked(false); } move(config.mainWindowPosition()); resize(config.mainWindowSize()); } return ret; } MainWindow* MainWindow::NewInstance() { MainWindow* ret = new MainWindow(); if((ret == NULL) || !ret->construct()) { delete ret; ret = NULL; } return ret; } //初始化菜单栏 bool MainWindow::initMenuBar() { bool ret = true; QMenuBar* mb = menuBar(); //menuBar为QMainWindow的成员变量 ret = ret && initFileMenu(mb); ret = ret && initEditMenu(mb); ret = ret && initFormatMenu(mb); ret = ret && initViewMenu(mb); ret = ret && initHelpMenu(mb); return ret; } //初始化工具栏 bool MainWindow::initToolBar() { bool ret = true; QToolBar* tb = addToolBar("Tool Bar"); tb->setIconSize(QSize(16, 16)); ret = ret && initFileToolItem(tb); tb->addSeparator(); ret = ret && initEditToolItem(tb); tb->addSeparator(); ret = ret && initFormatToolItem(tb); tb->addSeparator(); ret = ret && initViewToolItem(tb); return ret; } //初始化状态栏 bool MainWindow::initStatusBar() { bool ret = true; QStatusBar* sb = statusBar(); QLabel* label = new QLabel("D.T.Software"); if( label != NULL ) { statusLbl.setMinimumWidth(200); statusLbl.setAlignment(Qt::AlignCenter); statusLbl.setText("Ln: 1 Col: 1"); label->setMinimumWidth(200); label->setAlignment(Qt::AlignCenter); sb->addPermanentWidget(new QLabel()); //添加分隔线 sb->addPermanentWidget(&statusLbl); sb->addPermanentWidget(label); } else { ret = false; } return ret; } //初始化主文本编辑组件 bool MainWindow::initMainEditor() { bool ret = true; QPalette p = mainEditor.palette(); p.setColor(QPalette::Inactive, QPalette::Highlight, p.color(QPalette::Active, QPalette::Highlight)); p.setColor(QPalette::Inactive, QPalette::HighlightedText, p.color(QPalette::Active, QPalette::HighlightedText)); mainEditor.setPalette(p); mainEditor.setParent(this); connect(&mainEditor, SIGNAL(textChanged()), this, SLOT(onTextChanged())); connect(&mainEditor, SIGNAL(copyAvailable(bool)),this,SLOT(onCopyAvailable(bool))); connect(&mainEditor, SIGNAL(redoAvailable(bool)),this,SLOT(onRedoAvailable(bool))); connect(&mainEditor, SIGNAL(undoAvailable(bool)),this,SLOT(onUndoAvailable(bool))); connect(&mainEditor, SIGNAL(cursorPositionChanged()), this, SLOT(onCursorPositionChanged())); setCentralWidget(&mainEditor); return ret; } //文件(下拉)菜单 bool MainWindow::initFileMenu(QMenuBar* mb) { QMenu* menu = new QMenu("File(&F)", mb);//指定parent为mb bool ret = (menu != NULL); if ( ret ) { QAction* action = NULL; //"新建"菜单项 ret = ret && makeAction(action, mb, "New(&N)", Qt::CTRL + Qt::Key_N); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileNew())); menu->addAction(action); //add Action to Menu Item } //"打开"菜单项 ret = ret && makeAction(action, mb, "Open(&O)...", Qt::CTRL + Qt::Key_O); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen())); menu->addAction(action); //add Action to Menu Item } //"保存"菜单项 ret = ret && makeAction(action, mb, "Save(&S)", Qt::CTRL + Qt::Key_S); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSave())); menu->addAction(action); //add Action to Menu Item } //"另存为"菜单项 ret = ret && makeAction(action, mb, "Save As(&A)...", 0); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs())); menu->addAction(action); //add Action to Menu Item } //水平分隔线 menu->addSeparator(); //"打印"菜单项 ret = ret && makeAction(action, mb, "Print(&P)...", Qt::CTRL + Qt::Key_P); if(ret) { connect(action, SIGNAL(triggered()),this, SLOT(onFilePrint())); menu->addAction(action); //add Action to Menu Item } menu->addSeparator(); //"退出"菜单项 ret = ret && makeAction(action, mb, "Exit(&X)", Qt::CTRL + Qt::Key_Q); if(ret) { connect(action, SIGNAL(triggered()), this, SLOT(onFileExit())); menu->addAction(action); //add Action Item to Menu } } if ( ret ) { mb->addMenu(menu); //add Menu to Menu Bar } else { delete menu; } return ret; } //“编辑”菜单 bool MainWindow::initEditMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Edit(&E)", mb); bool ret = (menu != NULL); if( ret ) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Undo(&U)", Qt::CTRL + Qt::Key_Z); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(undo())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Redo(&R)...", Qt::CTRL + Qt::Key_Y); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(redo())); action->setEnabled(false); menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Cut(&T)", Qt::CTRL + Qt::Key_X); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(cut())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Copy(&C)", Qt::CTRL + Qt::Key_C); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(copy())); action->setEnabled(false); menu->addAction(action); } ret = ret && makeAction(action, mb, "Paste(&P)", Qt::CTRL + Qt::Key_V); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(paste())); menu->addAction(action); } ret = ret && makeAction(action, mb, "Delete(&L)", Qt::Key_Delete); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditDelete())); menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Find(&F)...", Qt::CTRL + Qt::Key_F); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditFind())); menu->addAction(action); } ret = ret && makeAction(action, mb, "Replace(&R)...", Qt::CTRL + Qt::Key_H); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditReplace())); menu->addAction(action); } ret = ret && makeAction(action, mb, "Goto(&G)...", Qt::CTRL + Qt::Key_G); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditGoto())); menu->addAction(action); } menu->addSeparator(); ret = ret && makeAction(action, mb, "Select All(&A)...", Qt::CTRL + Qt::Key_A); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(selectAll())); menu->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“格式”菜单 bool MainWindow::initFormatMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Format(&O)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Auto Wrap(&W)", 0); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onFormatWrap())); menu ->addAction(action); } ret = ret && makeAction(action, mb, "Font(&F)...", 0); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFormatFont())); menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“查看”菜单 bool MainWindow::initViewMenu(QMenuBar* mb) { QMenu* menu = new QMenu("View(&V)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "Tool Bar(&T)", 0); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onViewToolBar())); menu ->addAction(action); } ret = ret && makeAction(action, mb, "Status Bar(&S)", 0); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onViewStatusBar())); menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //“帮助”菜单 bool MainWindow::initHelpMenu(QMenuBar* mb) { QMenu* menu = new QMenu("Help(&H)", mb); bool ret = ( menu != NULL); if (ret) { QAction* action = NULL; ret = ret && makeAction(action, mb, "User Manual", 0); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onHelpManual())); menu ->addAction(action); } ret = ret && makeAction(action, mb, "About NotePad...", 0); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onHelpAbout())); menu ->addAction(action); } } if ( ret ) { mb->addMenu(menu); } else { delete menu; } return ret; } //工具栏设置 bool MainWindow::initFileToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "New", ":/Res/pic/new.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileNew())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Open", ":/Res/pic/open.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Save", ":/Res/pic/save.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSave())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Save As", ":/Res/pic/saveas.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Print", ":/Res/pic/print.png"); if ( ret ) { connect(action, SIGNAL(triggered()),this, SLOT(onFilePrint())); tb->addAction(action); } return ret; } bool MainWindow::initEditToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Undo", ":/Res/pic/undo.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(undo())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Redo", ":/Res/pic/redo.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(redo())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Cut", ":/Res/pic/cut.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(cut())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Copy", ":/Res/pic/copy.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(copy())); action->setEnabled(false); tb->addAction(action); } ret = ret && makeAction(action, tb, "Paste", ":/Res/pic/paste.png"); if ( ret ) { connect(action, SIGNAL(triggered()), &mainEditor, SLOT(paste())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Find", ":/Res/pic/find.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditFind())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Replace", ":/Res/pic/replace.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onEditReplace())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Goto", ":/Res/pic/goto.png"); if ( ret ) { tb->addAction(action); } return ret; } bool MainWindow::initFormatToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Auto Wrap", ":/Res/pic/wrap.png"); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onFormatWrap())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Font", ":/Res/pic/font.png"); if ( ret ) { connect(action, SIGNAL(triggered()), this, SLOT(onFormatFont())); tb->addAction(action); } return ret; } bool MainWindow::initViewToolItem(QToolBar* tb) { bool ret = true; QAction* action = NULL; ret = ret && makeAction(action, tb, "Tool Bar", ":/Res/pic/tool.png"); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onViewToolBar())); tb->addAction(action); } ret = ret && makeAction(action, tb, "Status Bar", ":/Res/pic/status.png"); if ( ret ) { action->setCheckable(true); action->setChecked(true); connect(action, SIGNAL(triggered()), this, SLOT(onViewStatusBar())); tb->addAction(action); } return ret; } //生成菜单项（第1个参数是菜单项对象，第2个参数为父组件，第3个参数为显示文本，第4个参数为快捷键） bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString text, int key) { bool ret = true; action = new QAction(text, parent); //设置parent if(action != NULL) { action->setShortcut(QKeySequence(key)); //设置快捷键 } else { ret = false; } return ret; } //生成工具栏中的各按钮 bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString tip, QString icon) { bool ret = true; action = new QAction("", parent); if( action != NULL ) { action ->setToolTip(tip); action->setIcon(QIcon(icon)); } else { ret = false; } return ret; } QToolBar* MainWindow::toolBar() { QToolBar* ret = NULL; const QObjectList& list = children(); for(int i=0; i< list.count(); i++) { QToolBar* tb = dynamic_cast<QToolBar*>(list[i]); if(tb != NULL) { ret = tb; break; } } return ret; } MainWindow::~MainWindow() { }
//MainWindowSlots.cpp
//该文件MainWindowSlots.cpp与MainWindowUI.cpp的分离 //体现了界面和功能代码分离的思想 #include "MainWindow.h" #include "AboutDialog.h" #include "AppConfig.h" #include <QMessageBox> #include <QFile> #include <QTextStream> #include <QMap> #include <QCloseEvent> #include <QDragEnterEvent> #include <QDropEvent> #include <QMimeData> #include <QToolBar> #include <QPrintDialog> //QT += printsupport #include <QApplication> #include <QInputDialog> #include <QStatusBar> #include <QFontDialog> #include <QDesktopServices> #include <QDebug> void MainWindow::showErrorMessage(QString message) { QMessageBox msg(this); msg.setWindowTitle("Erro"); msg.setText(message); msg.setIcon(QMessageBox::Critical); msg.setStandardButtons(QMessageBox::Ok); msg.exec(); } int MainWindow::showQueryMessage(QString message) { QMessageBox msg(this); msg.setWindowTitle("Query"); msg.setText(message); msg.setIcon(QMessageBox::Question); msg.setStandardButtons(QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel); return msg.exec(); } QString MainWindow::showFileDialog(QFileDialog::AcceptMode mode, QString title) { QString ret = ""; QFileDialog fd(this); QStringList filters; QMap<QString, QString> map; const char* filterArray[][2] = { {"Text(*.txt)", ".txt"}, {"All Files(*.*)", "*" }, {NULL, NULL} }; for (int i=0; filterArray[i][0] != NULL; i++) { filters.append(filterArray[i][0]); map.insert(filterArray[i][0], filterArray[i][1]); } fd.setWindowTitle(title); fd.setAcceptMode(mode); //QFileDialog::AcceptOpen或AcceptSave fd.setNameFilters(filters); if(mode == QFileDialog::AcceptOpen) { fd.setFileMode(QFileDialog::ExistingFile); //打开文件必须存在！ } if(fd.exec() == QFileDialog::Accepted) { ret = fd.selectedFiles()[0]; //Qt5中ret返回的是完整的路径名，含后缀。因此，后面的if块可省略，但Qt4可能 //会返回不带后缀的文件名，当保存文件时，须手动加上去。 if(mode == QFileDialog::AcceptSave) { QString postfix = map[fd.selectedNameFilter()]; if((postfix != "*") && !ret.endsWith(postfix)) { ret = ret + postfix; } } } return ret; } void MainWindow::preEditorChanged() { if (m_isTextChanged) { int r = showQueryMessage("Do you want to save the changes to file?"); switch(r) { case QMessageBox::Yes: saveCurrentData(m_filePath); break; case QMessageBox::No: m_isTextChanged = false; break; case QMessageBox::Cancel: break; } } } void MainWindow::onFileNew() { preEditorChanged(); if(!m_isTextChanged) { mainEditor.clear(); setWindowTitle("NotePad - [ New ]"); m_filePath = ""; m_isTextChanged = false; } } void MainWindow::openFileToEditor(QString path) { if( path != "") { QFile file(path); if (file.open(QIODevice::ReadOnly | QIODevice::Text)) { mainEditor.setPlainText(QString(file.readAll())); file.close(); m_filePath = path; //记录当前打开的文件路径和文件名 m_isTextChanged = false; setWindowTitle("NotePad - [" + m_filePath + "]"); } else { showErrorMessage(QString("Open file Error!\n\n") + "\"" + path + "\""); } } } void MainWindow::openFile(QString path) { preEditorChanged(); if(!m_isTextChanged) { openFileToEditor(path); } } void MainWindow::onFileOpen() { preEditorChanged(); if( !m_isTextChanged) { QString path = showFileDialog(QFileDialog::AcceptOpen, "Open"); openFileToEditor(path); } } QString MainWindow::saveCurrentData(QString path, QString title) { QString ret = path; if (ret =="") { //执行下面语句时，用户可以点击“取消”，此时ret返回"" ret = showFileDialog(QFileDialog::AcceptSave, title); } if (ret != "") { QFile file(ret); if (file.open(QIODevice::WriteOnly | QIODevice::Text)) { QTextStream out(&file); out << mainEditor.toPlainText(); file.close(); setWindowTitle("NotePad - [" + ret + "]"); m_isTextChanged = false; //己保存 } else { showErrorMessage(QString("Save file Error!\n\n") + "\"" + m_filePath + "\""); ret =""; //保存失败时 } } return ret; } void MainWindow::onFileSave() { QString path = saveCurrentData(m_filePath, "Save"); if( path != "" ) { m_filePath = path; } } void MainWindow::onFileSaveAs() { QString path = saveCurrentData(m_filePath, "Save As"); if( path != "" ) { m_filePath = path; } } void MainWindow::onTextChanged() { if( !m_isTextChanged ) { setWindowTitle("*" + windowTitle()); } m_isTextChanged = true; //qDebug()<< "onTextChanged()"; } void MainWindow::closeEvent(QCloseEvent* e) { preEditorChanged(); QFont font = mainEditor.font(); bool isWrap = (mainEditor.lineWrapMode() == QPlainTextEdit::WidgetWidth); bool tbVisible = toolBar()->isVisible(); bool sbVisible = statusBar()->isVisible(); AppConfig config(font, pos(),size(), isWrap, tbVisible, sbVisible); config.store(); if(!m_isTextChanged) { QMainWindow::closeEvent(e); } else { //当用户按下“取消” e->ignore();//忽略关闭事件 } } void MainWindow::dragEnterEvent(QDragEnterEvent *e) { if(e->mimeData()->hasUrls()) { e->acceptProposedAction(); } else { e->ignore(); } } void MainWindow::dropEvent(QDropEvent *e) { qDebug() << "dropEvent"; if(e->mimeData()->hasUrls()) { QList<QUrl> list = e->mimeData()->urls(); QString path = list[0].toLocalFile(); QFileInfo fi(path); if(fi.isFile()) { preEditorChanged(); if(!m_isTextChanged) { openFileToEditor(path); } } else { showErrorMessage("Can‘t open a folder!"); } } else { e->ignore(); } } void MainWindow::onCopyAvailable(bool available) { QAction* action = findMenuBarAction("Copy"); if (action != NULL) action->setEnabled(available); action = findMenuBarAction("Cut"); if (action != NULL) action->setEnabled(available); action = findToolBarAction("Copy"); if (action != NULL) action->setEnabled(available); action = findToolBarAction("Cut"); if (action != NULL) action->setEnabled(available); } void MainWindow::onRedoAvailable(bool available) { QAction* action = findMenuBarAction("Redo"); if (action != NULL) action->setEnabled(available); action = findToolBarAction("Redo"); if (action != NULL) action->setEnabled(available); } void MainWindow::onUndoAvailable(bool available) { QAction* action = findMenuBarAction("Undo"); if (action != NULL) action->setEnabled(available); action = findToolBarAction("Undo"); if (action != NULL) action->setEnabled(available); } QAction* MainWindow::findMenuBarAction(QString text) { QAction* ret = NULL; const QObjectList& list = menuBar()->children(); for( int i=0; i<list.count(); i++) { //各菜单（如文件、编辑、查看等） QMenu* menu = dynamic_cast<QMenu*>(list[i]); if(menu != NULL) { QList<QAction*> actions = menu->actions(); for(int j=0; j<actions.count(); j++) { if(actions[j]->text().startsWith(text)) { ret = actions[j]; break; } } } } return ret; } QAction* MainWindow::findToolBarAction(QString text) { QAction* ret = NULL; QList<QAction*> actions = toolBar()->actions(); for(int j=0; j<actions.count(); j++) { if(actions[j]->toolTip().startsWith(text)) { ret = actions[j]; break; } } return ret; } void MainWindow::onFilePrint() { QPrintDialog dlg(this); dlg.setWindowTitle("Print"); if(dlg.exec() == QPrintDialog::Accepted) { QPrinter* p = dlg.printer(); mainEditor.document()->print(reinterpret_cast<QPagedPaintDevice*>(p)); } } void MainWindow::onCursorPositionChanged() { int pos = mainEditor.textCursor().position(); QString text = mainEditor.toPlainText(); int col = 0;//列数 int ln = 0; //行数 int flag = -1; //用于记录光标之前最后一个‘\n‘所在索引位置 //从头到光标所在位置 for(int i=0; i<pos; i++) { if( text[i] == ‘\n‘) { ln++; flag = i; } } col = pos -(flag + 1); statusLbl.setText("Ln: " + QString::number(ln+1) + " Col: " + QString::number(col+1)); } void MainWindow::onEditDelete() { QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_Delete, Qt::NoModifier); QKeyEvent keyRelease(QEvent::KeyRelease, Qt::Key_Delete, Qt::NoModifier); QApplication::sendEvent(&mainEditor, &keyPress); QApplication::sendEvent(&mainEditor, &keyRelease); } void MainWindow::onEditFind() { m_pFindDlg->show(); } void MainWindow::onEditReplace() { m_pRelaceDlg->show(); } void MainWindow::onEditGoto() { bool ok = false; int ln = QInputDialog::getInt(this, "Goto","Line:",1,1,mainEditor.document()->lineCount(), 1,&ok,Qt::WindowCloseButtonHint | Qt::Drawer); if (ok) { QString text = mainEditor.toPlainText(); QTextCursor c = mainEditor.textCursor(); int pos = 0; int next = -1;//表示下一个换行符的位置 for(int i=0; i<ln; i++) { pos = next + 1; next = text.indexOf(‘\n‘, pos); } c.setPosition(pos); mainEditor.setTextCursor(c); } } void MainWindow::onViewToolBar() { //枚举窗体上的所有组件（含菜单、Editor、工具栏、状态栏等） QToolBar* tb = toolBar(); if(tb != NULL) { bool visible = tb->isVisible(); tb->setVisible(!visible); //更新菜单栏和工具栏的状态标志 findMenuBarAction("Tool Bar")->setChecked(!visible); findToolBarAction("Tool Bar")->setChecked(!visible); } } void MainWindow::onViewStatusBar() { QStatusBar* sb = statusBar(); bool visible = sb->isVisible(); sb->setVisible(!visible); //更新菜单栏和工具栏的状态标志 findMenuBarAction("Status Bar")->setChecked(!visible); findToolBarAction("Status Bar")->setChecked(!visible); } void MainWindow::onFileExit() { close(); } void MainWindow::onFormatWrap() { QPlainTextEdit::LineWrapMode mode = mainEditor.lineWrapMode(); if(mode == QPlainTextEdit::NoWrap) { mainEditor.setLineWrapMode(QPlainTextEdit::WidgetWidth); findMenuBarAction("Auto Wrap")->setChecked(true); findToolBarAction("Auto Wrap")->setChecked(true); } else { mainEditor.setLineWrapMode(QPlainTextEdit::NoWrap); findMenuBarAction("Auto Wrap")->setChecked(false); findToolBarAction("Auto Wrap")->setChecked(false); } } void MainWindow::onFormatFont() { bool ok = false; QFont font = QFontDialog::getFont(&ok, mainEditor.font(), this); if(ok) { mainEditor.setFont(font); } } void MainWindow::onHelpManual() { //打开本地文件 QDesktopServices::openUrl(QUrl("file:///C:/Users/santaclaus/Desktop/help.txt")); //打开网站 //QDesktopServices::openUrl(QUrl("http://www.xxx.com")); } void MainWindow::onHelpAbout() { AboutDialog(this).exec(); }
3. 小结
（1）GUI程序主窗口的相关参数必须保存
（2）GUI程序在收到关闭事件时保存状态参数
（3）GUI程序依然能够接收命令行参数
（4）操作系统将文件的路径作为命令行参数传递
第52课 命令行参数的应用
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