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C++ (Qt)
#include <QApplication>
#include <QMouseEvent>
 
#include "ui_Dialog.h"
 
 
 
 
class Resizer : public QObject
{
public:
	Resizer( QWidget * widget ) :
		widget_( widget )
	{
		isMousePressed_ = false;
		widget_->installEventFilter( this );
	}
 
	bool eventFilter( QObject * o, QEvent * e )
	{
		switch ( e->type() )
		{
		case QEvent::MouseButtonPress:
		{
			QMouseEvent * me = static_cast<QMouseEvent*>( e );
 
			if ( !(me->modifiers() & Qt::AltModifier) )
				break;
 
			isMousePressed_ = true;
			pos_ = widget_->mapToGlobal( me->pos() );
		}
			return true;
 
		case QEvent::MouseButtonRelease:
		{
			if ( !isMousePressed_ )
				break;
 
			isMousePressed_ = false;
		}
			return true;
 
		case QEvent::MouseMove:
		{
			if ( !isMousePressed_ )
				break;
 
			QMouseEvent * me = static_cast<QMouseEvent*>( e );
 
			const QPoint newPos = widget_->mapToGlobal( me->pos() );
			const QPoint distance = newPos - pos_;
			pos_ = newPos;
 
			if ( me->buttons() & Qt::LeftButton )
				widget_->move( widget_->pos() + distance );
			else if ( me->buttons() & Qt::RightButton )
				widget_->resize( widget_->size() + QSize( distance.x(), distance.y() ) );
	}
			return true;
		}
 
		return QObject::eventFilter( o, e );
	}
 
private:
	QWidget * widget_;
	bool isMousePressed_;
	QPoint pos_;
};
 
 
 
 
int main( int argc, char ** argv )
{
	QApplication app( argc, argv );
 
	QDialog dialog;
	Ui::Dialog ui;
	ui.setupUi( &dialog );
 
	Resizer resizer( ui.button );
 
	return dialog.exec();
}
 

XML
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <widget class="QWidget" name="widget" native="true">
     <widget class="QPushButton" name="button">
      <property name="geometry">
       <rect>
        <x>120</x>
        <y>100</y>
        <width>141</width>
        <height>41</height>
       </rect>
      </property>
      <property name="text">
       <string>Drag me with Alt+Mouse</string>
      </property>
     </widget>
    </widget>
   </item>
   <item>
    <widget class="Line" name="line">
     <property name="orientation">
      <enum>Qt::Horizontal</enum>
     </property>
    </widget>
   </item>
   <item>
    <widget class="QDialogButtonBox" name="buttonBox">
     <property name="orientation">
      <enum>Qt::Horizontal</enum>
     </property>
     <property name="standardButtons">
      <set>QDialogButtonBox::Ok</set>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>buttonBox</sender>
   <signal>accepted()</signal>
   <receiver>Dialog</receiver>
   <slot>accept()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>248</x>
     <y>254</y>
    </hint>
    <hint type="destinationlabel">
     <x>157</x>
     <y>274</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>buttonBox</sender>
   <signal>rejected()</signal>
   <receiver>Dialog</receiver>
   <slot>reject()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>316</x>
     <y>260</y>
    </hint>
    <hint type="destinationlabel">
     <x>286</x>
     <y>274</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>
 

cmake_minimum_required( VERSION 2.6 )

find_package( Qt4 REQUIRED )
include( "${QT_USE_FILE}" )

include_directories( "${CMAKE_CURRENT_BINARY_DIR}" )

qt4_wrap_ui( Reqizer_UI_HEADERS "Dialog.ui" )

add_executable( Resizer ${Reqizer_UI_HEADERS} "main.cpp" )
target_link_libraries( Resizer ${QT_LIBRARIES} )