Difference between revisions of "Development/Tutorials/Kate/KTextEditor Example"

Revision as of 22:04, 29 June 2011

Abstract

We build a small application using KTexteditor. This example supports syntax highlighting and other useful features. We see how to use KTextEditor.

The Code

main.cpp

```
#include <KApplication>
```
```
#include <KAboutData>
```
```
#include <KCmdLineArgs>
```
```
 
```
```
#include "mainwindow.h"
```
```
 
```
```
int main (int argc, char *argv[])
```
```
{
```

  KAboutData aboutData( "editor", "editor",

```
      ki18n("Editor"), "1.0",
```

      ki18n("A simple text area which can load and save."),

```
      KAboutData::License_GPL,
```

      ki18n("Copyright (c) 2007 Developer") );

  KCmdLineArgs::init( argc, argv, &aboutData );

```
  KApplication app;
```
```
 
```

  MainWindow* window = new MainWindow();

```
  window->show();
```
```
  return app.exec();
```
```
}
```

In main.cpp just defines aboutData and app and shows Mainwindow.

mainwindow.h

```
#ifndef MAINWINDOW_H
```
```
#define MAINWINDOW_H
```
```
 
```
```
#include <KParts/MainWindow>
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```
#include <QtGui/QKeyEvent>
```
```
 
```
```
 
```
```
namespace KTextEditor
```
```
{
```
```
  class Document;
```
```
  class View;
```
```
}
```
```
 
```

class MainWindow : public KParts::MainWindow

```
{
```
```
  Q_OBJECT
```
```
 
```
```
  public:
```
```
    MainWindow(QWidget *parent=0);
```
```
 
```
```
  private slots:
```
```
    void clear();
```
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    void openFile();
```
```
 
```
```
  private:
```
```
    void setupActions();
```
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    KTextEditor::View *m_view;
```
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    KTextEditor::Document *m_doc;
```
```
};
```
```
 
```
```
#endif
```

Class MainWindow is a successor of KXmlGuiWindow and contains KTextEditor (document and view) as a private Variable. There are also some useful methods defined.

mainwindow.cpp

```
#include "mainwindow.h"
```
```
 
```
```
#include <KApplication>
```
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#include <KAction>
```
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#include <KLocale>
```
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#include <KActionCollection>
```
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#include <KStandardAction>
```
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#include <KFileDialog>
```
```
#include <KMessageBox>
```
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#include <KIO/NetAccess>
```
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#include <KSaveFile>
```
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#include <QTextStream>
```
```
#include <KXMLGUIFactory>
```
```
 
```
```
 
```
```
#include <KTextEditor/Document>
```
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#include <KTextEditor/View>
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#include <KTextEditor/Editor>
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#include <KTextEditor/EditorChooser>
```
```
 
```
```
 
```
```
MainWindow::MainWindow(QWidget *)
```
```
{
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  KTextEditor::Editor *editor = KTextEditor::EditorChooser::editor();

```
 
```
```
  if (!editor) {
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    KMessageBox::error(this, i18n("A KDE text-editor component could not be found;\n"

				  "please check your KDE installation."));

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    kapp->exit(1);
```
```
  }
```
```
 
```
```
  m_doc = editor->createDocument(0);
```

  m_view = qobject_cast<KTextEditor::View*>(m_doc->createView(this));

```
 
```
```
  setCentralWidget(m_view);
```
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  setupActions();
```
```
 
```
```
  setXMLFile("editorui.rc");
```
```
  createShellGUI(true);
```
```
 
```
```
  guiFactory()->addClient(m_view);
```
```
 
```
```
  show ();
```
```
}
```
```
 
```
```
void MainWindow::setupActions()
```
```
{
```

  KStandardAction::quit(kapp, SLOT(quit()), actionCollection());

  KStandardAction::open(this, SLOT(openFile()), actionCollection());

  KStandardAction::clear(this, SLOT(clear()), actionCollection());

```
}
```
```
 
```
```
void MainWindow::clear()
```
```
{
```
```
  m_doc->clear();
```
```
}
```
```
 
```
```
void MainWindow::openFile()
```
```
{
```

  m_view->document()->openUrl(KFileDialog::getOpenFileName());

```
}
```

The implementation is straight forward and self-explanatory. Some remarks:

MainWindow::Mainwindow()

First the editor component is created on the heap. After creating document() and view(), the GUI definitions are loaded from editorui.rc. The call guiFactory()->addClient(m_view) adds the kate parts menue and toolbar definitions to MainWindow. After that a full featured texteditor with syntax highlighting etc. is available for your application.

MainWindow::setupAction() defines three additional actions.

editorui.rc

<!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">

<kpartgui name="editor" version="1"> <!-- increase version number if you don't see changes after experimenting with this file -->

```
 
```
```
<MenuBar>
```

  <Menu name="file" noMerge="1"><text>&amp;File</text>

```
 
```
```
    <Action name="file_open" />
```

    <DefineGroup name="save_merge" append="save_merge" />

```
    <Separator/>
```
```
 
```

    <DefineGroup name="revert_merge" append="revert_merge"/>

    <DefineGroup name="print_merge" append="print_merge"/>

```
    <Separator/>
```
```
 
```
```
    <Action name="file_quit"/>
```
```
  </Menu>
```
```
  <Merge />
```
```
</MenuBar>
```
```
 
```

<ToolBar name="mainToolBar" noMerge="1"><text>Main Toolbar</text>

```
  <Action name="file_open" />
```

  <DefineGroup name="file_operations" />

```
  <Separator />
```
```
  <DefineGroup name="print_merge" />
```
```
  <Separator />
```
```
  <Action name="file_close" />
```
```
  <Separator />
```

  <DefineGroup name="edit_operations" />

```
  <Separator />
```

  <DefineGroup name="find_operations" />

```
  <Separator />
```

  <DefineGroup name="zoom_operations" />

```
</ToolBar>
```
```
 
```

<Menu name="ktexteditor_popup" noMerge="1">

  <DefineGroup name="popup_operations" />

```
</Menu>
```
```
 
```
```
</kpartgui>
```

CMakeLists.txt

project(editor)

find_package(KDE4 REQUIRED) include_directories(${KDE4_INCLUDES})

set(editor_SRCS


 main.cpp
 mainwindow.cpp

)
kde4_add_executable(editor ${editor_SRCS})
target_link_libraries(editor ${KDE4_KDEUI_LIBS} 

                            ${KDE4_KIO_LIBS}
                            ${KDE4_KTEXTEDITOR_LIBS})


install(TARGETS editor DESTINATION ${BIN_INSTALL_DIR})
install(FILES editorui.rc 

       DESTINATION ${DATA_INSTALL_DIR}/editor)

</syntaxhighlight>

@@ Line 145: / Line 145: @@
 ===editorui.rc===
-<code xml n>
+<syntaxhighlight lang="xml" line>
 <!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
 <kpartgui name="editor" version="1"> <!-- increase version number if you don't see changes after experimenting with this file -->