Qt/Utilities/HandleItem - Revision history

Daviddoria: /* HandleItem.cpp */

2011-11-19T21:20:15Z

‎HandleItem.cpp

Daviddoria: /* form.cpp */

2011-11-19T21:19:59Z

‎form.cpp

Daviddoria: Created page with '==HandleItem.cpp== #include #include "form.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); Form form; form.show();…'

2011-11-18T21:00:09Z

Created page with '==HandleItem.cpp== <source lang="cpp"> #include <QApplication> #include "form.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); Form form; form.show();…'

New page

==HandleItem.cpp==
<source lang="cpp">
#include <QApplication>

#include "form.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Form form;

form.show();
return app.exec();
}

</source>

==form.h==
<source lang="cpp">
#ifndef FORM_H
#define FORM_H

#include "ui_form.h"

class Form : public QWidget, private Ui::Form
{
Q_OBJECT

public slots:

public:
Form(QWidget *parent = 0);

};

#endif

</source>

==form.cpp==
<source lang="cpp">
#include <QtGui>

#include "form.h"
#include "HandleItem.h"

#include <iostream>

Form::Form(QWidget *parent) : QWidget(parent)
{
setupUi(this);

QGraphicsScene* scene = new QGraphicsScene( 0, 0, 200, 200 );
QGraphicsRectItem *rectItem = new QGraphicsRectItem( QRect( 10, 10, 50, 100 ), 0, scene );

HandleItem *rrh = new HandleItem( rectItem, scene, Qt::red, HandleItem::RightHandle );

this->graphicsView->setScene( scene );

}

</source>

==HandleItem.h==
<source lang="cpp">
#ifndef HANDLEITEM_H
#define HANDLEITEM_H

#include <QGraphicsItem>
#include <QGraphicsRectItem>

class HandleItem;

class HandleItem : public QGraphicsItem
{
public:

enum HandleRole
{
CenterHandle,
RightHandle,
TopHandle,
LeftHandle,
BottomHandle
};

HandleItem( QGraphicsRectItem *item, QGraphicsScene *scene, QColor color, HandleRole role = CenterHandle, QList<HandleItem*> handles = QList<HandleItem*>() );

void paint( QPainter *paint, const QStyleOptionGraphicsItem *option, QWidget *widget );
QRectF boundingRect() const;

protected:
void mousePressEvent( QGraphicsSceneMouseEvent *event );
void mouseReleaseEvent( QGraphicsSceneMouseEvent *event );

QVariant itemChange( GraphicsItemChange change, const QVariant &data );

private:
QGraphicsRectItem *m_item;

HandleRole m_role;
QColor m_color;

QList<HandleItem*> m_handles;

bool m_pressed;
};

#endif // HANDLEITEM_H

</source>

==HandleItem.cpp==
<source lang="cpp">
#include "HandleItem.h"

#include <QPainter>
#include <QPointF>

#include <iostream>

HandleItem::HandleItem( QGraphicsRectItem *item, QGraphicsScene *scene, QColor color, HandleItem::HandleRole role, QList<HandleItem*> handles ) : QGraphicsItem( 0, scene )
{
m_role = role;
m_color = color;

m_item = item;
m_handles = handles;

m_pressed = false;
setZValue( 100 );

setFlag( ItemIsMovable );
setFlag(ItemSendsGeometryChanges);
}

void HandleItem::paint( QPainter *paint, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
paint->setPen( m_color );
paint->setBrush( m_color );

QRectF rect = boundingRect();
QVector<QPointF> points;

switch( m_role )
{
case RightHandle:
points << rect.center()+QPointF(3,0) << rect.center()+QPointF(-3,-5) << rect.center()+QPointF(-3,5);
paint->drawConvexPolygon( QPolygonF(points) );
break;
}
}

QRectF HandleItem::boundingRect() const
{
QPointF point = m_item->boundingRect().center();

switch( m_role )
{
case RightHandle:
point.setX( m_item->boundingRect().right() );
return QRectF( point-QPointF(3, 5), QSize( 6, 10 ) );
}

return QRectF();
}

QVariant HandleItem::itemChange( GraphicsItemChange change, const QVariant &data )
{
if( change == ItemPositionChange && m_pressed )
{

QPointF movement;
QPointF newData = data.toPointF();
QRectF newRect = m_item->rect();

switch( m_role )
{
case RightHandle:
std::cout << "itemChange RightHandle()" << std::endl;
// Prevent the rectangle from collapsing.
if( m_item->sceneBoundingRect().width() + movement.x() <= 5 )
{
std::cout << "too small! " << std::endl;
return QGraphicsItem::itemChange( change, newData );
}

// Snap the movement to the X direction
newData.setY(0);

movement = newData - pos();
std::cout << "current pos: " << pos().x() << " , " << pos().y() << std::endl;
std::cout << "input data: " << data.toPoint().x() << " , " << data.toPoint().y() << std::endl;
std::cout << "new data: " << newData.toPoint().x() << " , " << newData.toPoint().y() << std::endl;
std::cout << "movement: " << movement.x() << " , " << movement.y() << std::endl;

// Resize the rectangle
std::cout << "Old right rect pos: " << m_item->rect().right() << std::endl;
newRect.setRight(m_item->rect().right() + movement.x());
std::cout << "Set new right rect pos: " << newRect.right() << std::endl;
m_item->setRect(newRect);

break;
} // end switch

return QGraphicsItem::itemChange( change, newData);
} // end if pressed

return QGraphicsItem::itemChange( change, data );
}

void HandleItem::mousePressEvent( QGraphicsSceneMouseEvent *event )
{
m_pressed = true;
QGraphicsItem::mousePressEvent( event );
}

void HandleItem::mouseReleaseEvent( QGraphicsSceneMouseEvent *event )
{
m_pressed = false;
QGraphicsItem::mouseReleaseEvent( event );
}

</source>

==form.ui==
<source lang="text">
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Form</class>
<widget class="QWidget" name="Form">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>Form</string>
</property>
<widget class="QGraphicsView" name="graphicsView">
<property name="geometry">
<rect>
<x>80</x>
<y>50</y>
<width>256</width>
<height>192</height>
</rect>
</property>
</widget>
</widget>
<resources/>
<connections/>
</ui>

</source>

==CMakeLists.txt==
<source lang="cmake">
cmake_minimum_required(VERSION 2.6)

PROJECT(HandleItem)

FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})

QT4_WRAP_UI(UISrcs form.ui)
QT4_WRAP_CPP(MOCSrcs form.h)

include_directories(${include_directories} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

ADD_EXECUTABLE(HandleItem main.cpp HandleItem.cpp form.cpp ${MOCSrcs} ${UISrcs})
TARGET_LINK_LIBRARIES(HandleItem ${QT_LIBRARIES})

</source>

@@ Line 124: / Line 124: @@
 #include <QPointF>
 #include <iostream>
@@ Line 153: / Line 154: @@
    case RightHandle:
      points << rect.center()+QPointF(3,0) << rect.center()+QPointF(-3,-5) << rect.center()+QPointF(-3,5);
      paint->drawConvexPolygon( QPolygonF(points) );
      break;
@@ Line 161: / Line 174: @@
 QRectF HandleItem::boundingRect() const
+{
    switch( m_role )
+   {
    case RightHandle:
-     point.setX( m_item->boundingRect().right() );
      return QRectF( point-QPointF(3, 5), QSize( 6, 10 ) );
+   }
@@ Line 184: / Line 212: @@
      switch( m_role )
+     {
      case RightHandle:
-       std::cout << "itemChange RightHandle()" << std::endl;
        // Prevent the rectangle from collapsing.
-       if( m_item->sceneBoundingRect().width() + movement.x() <= 5 )
+       //if( fabs(movement.x()) <= 5 )
+	{
 	std::cout << "too small! " << std::endl;
@@ Line 197: / Line 248: @@
        movement = newData - pos();
        // Resize the rectangle
        newRect.setRight(m_item->rect().right() + movement.x());
-      std::cout << "Set new right rect pos: " << newRect.right() << std::endl;
        m_item->setRect(newRect);
-−
        break;
      } // end switch
@@ Line 228: / Line 316: @@
    QGraphicsItem::mouseReleaseEvent( event );
+}
 </source>

@@ Line 55: / Line 55: @@
    QGraphicsRectItem *rectItem = new QGraphicsRectItem( QRect( 10, 10, 50, 100 ), 0, scene );
-   HandleItem *rrh = new HandleItem( rectItem, scene, Qt::red, HandleItem::RightHandle );
+  // The center handle must know about all of the other handles so it can translate them with the object
    this->graphicsView->setScene( scene );