[SOLVED] QWidget and QRects

guidupas

Hi all!

I have a QWidget subclassed and I need to implement some repaints with mouse move event, but when I use the QRect contains to check if the mouse position is inside the QRect it gives me a different position as the drawed QRect.

What is going on here?

Code
fluxocaixawidget.h
@
#ifndef FLUXOCAIXAWIDGET_H
#define FLUXOCAIXAWIDGET_H

#include <QWidget>
#include <QPainter>

class fluxoCaixaWidget : public QWidget
{
Q_OBJECT
public:
explicit fluxoCaixaWidget(QWidget *parent = 0);

QRect rectLinhaTempo();

protected:
void paintEvent(QPaintEvent *);
void mouseMoveEvent(QMouseEvent *);

private:
bool dentro;
QRect linhaTempo;

signals:

public slots:

};

#endif // FLUXOCAIXAWIDGET_H
@

fluxocaixawidget.cpp
@
#include "fluxocaixawidget.h"

#include <QDebug>

fluxoCaixaWidget::fluxoCaixaWidget(QWidget *parent) :
QWidget(parent)
{
this->setMouseTracking(true);
this->dentro = false;
}

void fluxoCaixaWidget::paintEvent(QPaintEvent *)
{
QPainter painter(this);

linhaTempo.setRect(20, this->parentWidget()->height() / 2 - 20, this->parentWidget()->width()-65, 30);

QPen caneta;

QBrush pincel(Qt::white);

painter.setBrush(pincel);

painter.drawRect(parentWidget()->rect());

if(this->dentro == true)
{
    caneta.setColor(Qt::red);
    caneta.setWidth(4);
}
else
{
    caneta.setColor(Qt::black);
    caneta.setWidth(2);
}

painter.setPen(caneta);

painter.drawRect(linhaTempo);

}

void fluxoCaixaWidget::mouseMoveEvent(QMouseEvent *)
{
if(this->linhaTempo.contains(QCursor::pos()))
{
qDebug() << "OK";
this->dentro = true;
}
else
{
qDebug() << "Fora";
this->dentro = false;
}
this->update();
}
@

sierdzio

There are numerous coordinate systems in Qt applications: a global position (on the screen), a position relative to window frame, a position relative to window contents, a position relative to widget, etc. To make sure you are checking within the same coordinate system, you need to map the coordinates.

Quoting the documentation:
[quote]The functions pos(), x(), and y() give the cursor position relative to the widget that receives the mouse event. If you move the widget as a result of the mouse event, use the global position returned by globalPos() to avoid a shaking motion.[/quote]

guidupas

SOLVED

Thanks for your help and time sierdzio.

Cheers!

@
void fluxoCaixaWidget::mouseMoveEvent(QMouseEvent *)
{
if(this->linhaTempo.contains(this->mapFromGlobal(QCursor::pos())))
{
qDebug() << "OK";
this->dentro = true;
}
else
{
qDebug() << "Fora";
this->dentro = false;
}
this->update();
}
@