Hi.
Look at this small example. It’s not fully functional but as example it’s good
enough, I hope...
From: Jean Richard Lima
Sent: Wednesday, October 29, 2014 8:34 PM
To: Interest@qt-project.org
Subject: [Interest] Position y() of widget inside Layout
Hello!
How can I get the y () position of a widget inside another?
I have 3 widgets within another widget when and try: geometry()->y() it returns
me is always 0 when applied to the layout, if he gives me shot, but I need the
layout and position, as I am dragging one over the other to switch places.
Thank you.
Jean Richard Lima
Consultor de Gestão e TIC
Software House de Projetos Específicos
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#include <QWidget>
#include <QPainter>
#include <QHBoxLayout>
#include <QApplication>
#include <QMouseEvent>
class Widget
: public QWidget
{
public:
explicit Widget( const QColor & color, QWidget * parent = 0 )
: QWidget( parent )
, m_color( color )
{}
QSize sizeHint() const
{
return QSize( 100, 75 );
}
protected:
void paintEvent( QPaintEvent * )
{
QPainter p( this );
p.setBrush( m_color );
p.drawRect( rect() );
}
private:
QColor m_color;
};
class Stack
: public QWidget
{
public:
Stack()
: m_layout( 0 )
, m_clicked( false )
, m_deltaX( 0 )
, m_deltaY( 0 )
{
m_layout = new QHBoxLayout( this );
Widget * w1 = new Widget( Qt::red, this );
m_layout->addWidget( w1 );
Widget * w2 = new Widget( Qt::green, this );
m_layout->addWidget( w2 );
Widget * w3 = new Widget( Qt::blue, this );
m_layout->addWidget( w3 );
setLayout( m_layout );
resize( 350, 100 );
}
protected:
void mousePressEvent( QMouseEvent * e )
{
if( e->button() == Qt::LeftButton )
{
m_clicked = true;
m_pos = e->pos();
}
e->accept();
}
void mouseMoveEvent( QMouseEvent * e )
{
if( m_clicked )
{
const QPoint pos = e->pos();
int index = -1;
QLayoutItem * item = findLayoutItem( pos, index );
if( item && index >= 0 )
{
const QRect r = item->geometry();
if( item->widget() )
item->widget()->raise();
const int deltaX = pos.x() - m_pos.x();
const int deltaY = pos.y() - m_pos.y();
m_deltaX += deltaX;
m_deltaY += deltaY;
if( qAbs( m_deltaX ) >= r.width() / 2 )
{
if( m_deltaX > 0 )
{
if( index < m_layout->count() -
1 )
{
item =
m_layout->takeAt( index );
m_layout->insertItem(
index + 1, item );
m_deltaX = 0;
m_deltaY = 0;
}
}
else
{
if( index > 0 )
{
item =
m_layout->takeAt( index );
m_layout->insertItem(
index - 1, item );
m_deltaX = 0;
m_deltaY = 0;
}
}
}
else
item->setGeometry( QRect( r.x() +
deltaX,
r.y() + deltaY, r.width(),
r.height() ) );
}
m_pos = pos;
}
e->accept();
}
void mouseReleaseEvent( QMouseEvent * e )
{
m_clicked = false;
m_deltaX = 0;
m_deltaY = 0;
m_layout->update();
e->accept();
}
private:
QLayoutItem * findLayoutItem( const QPoint & pos, int & index )
{
index = -1;
if( !m_layout->isEmpty() )
{
for( int i = 0; i < m_layout->count(); ++i )
if( m_layout->itemAt( i )->geometry().contains(
pos ) )
{
index = i;
return m_layout->itemAt( i );
}
}
return 0;
}
private:
QHBoxLayout * m_layout;
bool m_clicked;
QPoint m_pos;
int m_deltaX;
int m_deltaY;
};
int main( int argc, char ** argv )
{
QApplication app( argc, argv );
Stack s;
s.show();
return app.exec();
}
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