Archive:Development/Tutorials/KCmdLineArgs (zh TW)

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摘要

現在我們有了一個可以載入和儲存檔案的文字編輯器。我們要讓這個編輯器像其他桌面程式一樣,能用命令列參數開啟檔案,甚至可以在 Dolphin 裡使用開啟方式來開啟檔案。

Introtokdetutorial5.png

程式碼

main.cpp

 1 #include <KApplication>
 2 #include <KAboutData>
 3 #include <KCmdLineArgs>
 4 #include <KUrl> //new
 5  
 6 #include "mainwindow.h"
 7  
 8 int main (int argc, char *argv[])
 9 {
10   KAboutData aboutData( "tutorial5", "tutorial5",
11       ki18n("Tutorial 5"), "1.0",
12       ki18n("A simple text area which can load and save."),
13       KAboutData::License_GPL,
14       ki18n("Copyright (c) 2007 Developer") );
15   KCmdLineArgs::init( argc, argv, &aboutData );
16 
17   KCmdLineOptions options; //新增的
18   options.add("+[file]", ki18n("Document to open")); //新增的
19   KCmdLineArgs::addCmdLineOptions(options); //新增的
20 
21   KApplication app;
22  
23   MainWindow* window = new MainWindow();
24   window->show();
25 
26   KCmdLineArgs *args = KCmdLineArgs::parsedArgs(); //新增的
27   if(args->count()) //新增的
28   {
29     window->openFile(args->url(0).url()); //新增的
30   }
31 
32   return app.exec();
33 }

mainwindow.h

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3  
 4 #include <KXmlGuiWindow>
 5 #include <KTextEdit>
 6  
 7 class MainWindow : public KXmlGuiWindow
 8 {
 9   Q_OBJECT
10   
11   public:
12     MainWindow(QWidget *parent=0);
13     void openFile(const QString &inputFileName); //新增的
14   
15   private:
16     KTextEdit* textArea;
17     void setupActions();
18     QString fileName;
19  
20   private slots:
21     void newFile();
22     void openFile();
23     void saveFile();
24     void saveFileAs();
25     void saveFileAs(const QString &outputFileName);
26 };
27  
28 #endif

mainwindow.cpp

  1 #include "mainwindow.h"
  2  
  3 #include <KApplication>
  4 #include <KAction>
  5 #include <KLocale>
  6 #include <KActionCollection>
  7 #include <KStandardAction>
  8 #include <KFileDialog>
  9 #include <KMessageBox>
 10 #include <KIO/NetAccess>
 11 #include <KSaveFile>
 12 #include <QTextStream>
 13  
 14 MainWindow::MainWindow(QWidget *parent)
 15     : KXmlGuiWindow(parent),
 16       fileName(QString())
 17 {
 18   textArea = new KTextEdit;
 19   setCentralWidget(textArea);
 20  
 21   setupActions();
 22 }
 23  
 24 void MainWindow::setupActions()
 25 {
 26   KAction* clearAction = new KAction(this);
 27   clearAction->setText(i18n("Clear"));
 28   clearAction->setIcon(KIcon("document-new"));
 29   clearAction->setShortcut(Qt::CTRL + Qt::Key_W);
 30   actionCollection()->addAction("clear", clearAction);
 31   connect(clearAction, SIGNAL(triggered(bool)),
 32           textArea, SLOT(clear()));
 33  
 34   KStandardAction::quit(kapp, SLOT(quit()),
 35                         actionCollection());
 36  
 37   KStandardAction::open(this, SLOT(openFile()),
 38                         actionCollection());
 39  
 40   KStandardAction::save(this, SLOT(saveFile()),
 41                         actionCollection());
 42  
 43   KStandardAction::saveAs(this, SLOT(saveFileAs()),
 44                         actionCollection());
 45  
 46   KStandardAction::openNew(this, SLOT(newFile()),
 47                         actionCollection());
 48  
 49   setupGUI();
 50 }
 51  
 52 void MainWindow::newFile()
 53 {
 54   fileName.clear();
 55   textArea->clear();
 56 }
 57  
 58 void MainWindow::saveFileAs(const QString &outputFileName)
 59 {
 60   KSaveFile file(outputFileName);
 61   file.open();
 62   
 63   QByteArray outputByteArray;
 64   outputByteArray.append(textArea->toPlainText());
 65   file.write(outputByteArray);
 66   file.finalize();
 67   file.close();
 68   
 69   fileName = outputFileName;
 70 }
 71  
 72 void MainWindow::saveFileAs()
 73 {
 74   saveFileAs(KFileDialog::getSaveFileName());
 75 }
 76  
 77 void MainWindow::saveFile()
 78 {
 79   if(!fileName.isEmpty())
 80   {
 81     saveFileAs(fileName);
 82   }
 83   else
 84   {
 85     saveFileAs();
 86   }
 87 }
 88  
 89 void MainWindow::openFile() //變更
 90 {
 91   openFile(KFileDialog::getOpenFileName());
 92 }
 93 
 94 void MainWindow::openFile(const QString &inputFileName) //新增的
 95 {
 96   QString tmpFile;
 97   if(KIO::NetAccess::download(inputFileName, tmpFile, 
 98          this))
 99   {
100     QFile file(tmpFile);
101     file.open(QIODevice::ReadOnly);
102     textArea->setPlainText(QTextStream(&file).readAll());
103     fileName = inputFileName;
104  
105     KIO::NetAccess::removeTempFile(tmpFile);
106   }
107   else
108   {
109     KMessageBox::error(this, 
110         KIO::NetAccess::lastErrorString());
111   }
112 }

tutorial5ui.rc

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <gui name="tutorial5"
 3      version="1"
 4      xmlns="http://www.kde.org/standards/kxmlgui/1.0"
 5      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 6      xsi:schemaLocation="http://www.kde.org/standards/kxmlgui/1.0
 7                          http://www.kde.org/standards/kxmlgui/1.0/kxmlgui.xsd" >
 8 
 9   <MenuBar>
10     <Menu name="file" >
11       <Action name="clear" />
12     </Menu>
13   </MenuBar>
14 
15   <ToolBar name="mainToolBar" >
16     <text>Main Toolbar</text>
17     <Action name="clear" />
18   </ToolBar>
19 
20 </gui>

這和前兩個教學的 tutorialxui.rc 一樣,唯一的改變就是從 tutorialx 變成了tutorial5

解釋

mainwindow.h

這裡我們只新增 openFile 函式,它接受一個 QString 作為參數。

void openFile(const QString &inputFileName);

mainwindow.cpp

這部分沒有新增程式碼,只是重新整理一下而已。所有 void openFile() 裡的東西都被移到了 void openFile(const QString &inputFileName) 裡,除了 KFileDialog::getOpenFileName() 的呼叫。

這樣,如果我們要一個對話框就呼叫 openFile(),如果已經有檔案名稱,呼叫openFile(QString) 就可以了。

main.cpp

This is where all the KCmdLineArgs magic happens.

編譯、安裝與執行

CMakeLists.txt

 1 project(tutorial5)
 2  
 3 find_package(KDE4 REQUIRED)
 4 include_directories( ${KDE4_INCLUDES} )
 5  
 6 set(tutorial5_SRCS 
 7   main.cpp
 8   mainwindow.cpp
 9 )
10  
11 kde4_add_executable(tutorial5 ${tutorial5_SRCS})
12  
13 target_link_libraries(tutorial5 ${KDE4_KDEUI_LIBS}
14                                 ${KDE4_KIO_LIBS})
15  
16 install(TARGETS tutorial5 DESTINATION ${BIN_INSTALL_DIR})
17 install( FILES tutorial5ui.rc 
18          DESTINATION  ${DATA_INSTALL_DIR}/tutorial5 )

有了這個檔案,這個教學就可以像教學3和4一樣建構和執行了。更多資訊,請見教學3。

mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$HOME
make install
$HOME/bin/tutorial5

繼續前進

現在你可以開始學習下一課:### (TODO User:milliams) 教學。


This page was last modified on 23 June 2013, at 15:16. Content is available under Creative Commons License SA 3.0 as well as the GNU Free Documentation License 1.2 unless otherwise noted.