Qt4: Quick start with loading extern ui

Well... I'm java developer with more than 5 years experience, but due to some mystic forces I should build QT application.

Let's start with creation simple Qt 4 application, build simple form with Qt Designer:

simple.ui

Added: Qt ui file is xml, simple.ui is follow xml:

<ui version="4.0" >
 <class>Form</class>
 <widget class="QWidget" name="Form" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>510</width>
    <height>90</height>
   </rect>
  </property>
  <property name="windowTitle" >
   <string>Simple form</string>
  </property>
  <layout class="QHBoxLayout" name="horizontalLayout" >
   <item>
    <widget class="QLabel" name="label" >
     <property name="text" >
      <string>Title</string>
     </property>
    </widget>
   </item>
   <item>
    <widget class="QLineEdit" name="lineEdit" />
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

create main.cpp:

#include <QApplication>

#include "ui_simple.h"

int main(int argc, char **argv)
{
 QApplication app(argc, argv);

 QWidget *w = new QWidget;
 Ui::Form form;
 form.setupUi(w);
 w->show();

 return app.exec();
}

ok, we have main.cpp and simple.ui

simple $ ls
main.cpp simple.ui

Now, create simple.pro

simple $ qmake -project
simple $ ls
main.cpp simple.ui simple.pro

...and create Makefile

simple $ qmake simple.pro

That's all. just make it!

Current task: to load dynamical simple.ui from other application with out precompilation.
Reference doc is QUiLoader Class Reference.

 simple $ mkdir ../loader && cd ../loader

main.cpp for dynamic loading:

#include <QApplication>
#include <QUiLoader>
#include <QFile>
#include <QWidget>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
 QUiLoader loader;
 QFile file("../simple/simple.ui");
 file.open(QFile::ReadOnly);
 QWidget *myWidget = loader.load(&file);
 file.close();
 
 myWidget->show();

 int res = app.exec();
 delete myWidget;
 return res;
}

create pro file

loader $ qmake -project

and add to loader.pro follow line:

CONFIG += uitools

compile and run it:

loader $ qmake loader.pro && make && ./loader

that's really all: we've got a qt 4 application with dymical ui loading from extern file.