Difference between revisions of "Development/Tutorials/Using KXmlGuiWindow"

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{{Template:I18n/Language Navigation Bar (zh_CN)|Development/Tutorials/创建主窗口}}
This page was moved [https://develop.kde.org/docs/getting-started/main_window/ here]
pre=[[Development/Tutorials/First_program (zh_CN)|教程1 - Hello World]]|
next=[[Development/Tutorials/Using_KActions|教程3 - 使用KActions]]|
== 摘要 ==
本教程承接上一讲[[Development/Tutorials/First_program (zh_CN)|教程1 - Hello World]] ,进一步介绍{{class|KXmlGuiWindow}}类的使用。
== 使用KXmlGuiWindow ==
In order to have a useful KXmlGuiWindow, we must subclass it. So we create two files, a <tt>mainwindow.cpp</tt> and a <tt>mainwindow.h</tt> which will contain our code. Our class inherits from KXmlGuiWindow because it uses XML e.g. to define the application's menu structure.
<code cppqt>
#include <KXmlGuiWindow>
#include <KTextEdit>
class MainWindow : public KXmlGuiWindow
    MainWindow(QWidget *parent=0);
    KTextEdit* textArea;
First we Subclass KXmlGuiWindow on line 7 with <tt>class MainWindow : public KXmlGuiWindow</tt>.
Then we declare the constructor with <tt>MainWindow(QWidget *parent=0);</tt>.
And finally we declare a pointer to the object that will make up the bulk of our program. {{class|KTextEdit}} is a generic richtext editor with some KDE niceties like cursor auto-hiding.
<code cppqt>
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent) : KXmlGuiWindow(parent)
  textArea = new KTextEdit;
First, of course, on line 1 we have to include the header file containing the class declaration.
On line 5, we initialise our text editor with an object. Then on line 6 we use the built-in setCentralWidget() function which tells the KXmlGuiWindow what should appear in the central section of the window.
Finally, KXmlGuiWindow::setupGUI() is called which does a lot of behind-the-scenes stuff and creates the default menu bars (Settings, Help).
==Back to main.cpp==
In order to actually run this window, we need to add a few lines in main.cpp:
<code cppqt>
#include <KApplication>
#include <KAboutData>
#include <KCmdLineArgs>
#include "mainwindow.h"
int main (int argc, char *argv[])
  KAboutData aboutData( "tutorial2", 0,
      ki18n("Tutorial 2"), "1.0",
      ki18n("A simple text area"),
      ki18n("Copyright (c) 2007 Developer") );
  KCmdLineArgs::init( argc, argv, &aboutData );
  KApplication app;
  MainWindow* window = new MainWindow();
  return app.exec();
The only new lines here (compared to Tutorial 1) are 18 and 19. On line 18, we create our MainWindow object and then on line 19, we display it.
The best way to build the program is to use CMake. All that's changed since tutorial 1 is that <tt>mainwindow.cpp</tt> has been added to the sources list and any <tt>tutorial1</tt> has become <tt>tutorial2</tt>.
<code ini>
project (tutorial2)
find_package(KDE4 REQUIRED)
include_directories( ${KDE4_INCLUDES} )
kde4_add_executable(tutorial2 ${tutorial2_SRCS})
target_link_libraries( tutorial2 ${KDE4_KDEUI_LIBS})
=== 编译运行 ===
To compile, link and run it, use:
cmake . && make && ./tutorial2
== 继续前进 ==
Now you can move on to [[Development/Tutorials/Using_KActions|using KActions]].

Latest revision as of 14:32, 8 September 2020

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This page was last edited on 8 September 2020, at 14:32. Content is available under Creative Commons License SA 4.0 unless otherwise noted.