Archived:Using QRubberband in Qt

Comments

23 Sep
2009

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Hamishwillee - Not going to delete

Ikipou 12:59, 6 September 2009 (UTC) posted:

1. The header is full of clutter. It is useless to keep the start point as an attribute. A new QRubberBand is created for each click, and is not deleted until the Widget is deleted.
2. I do not improve the article because I think it would be better to remove it completely. As you say yourself, a rubber band is useless on a phone, it is a widget for Desktop applications.

I agree that the code is partially broken. I don't agree that a rubber band is pointless - on larger touch screens devices it might be very useful.

In any case this is archived, because we're recommending Qt Quick for this sort of stuff.

hamishwillee 03:10, 14 February 2012 (EET)

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Archived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

Qt Quick should be used for all UI development on mobile devices. The approach described in this article (based on QWidget) is deprecated.

Article Metadata

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Tested with

Devices(s): S60 Emulator

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Compatibility

Platform(s): Qt

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Article

Keywords: QRubberBand,QMouseEvent

Created: mind_freak (05 Aug 2009)

Last edited: hamishwillee (11 Oct 2012)

Overview

The QRubberBand class provides a rectangle or line that can indicate a selection or a boundary.A rubber band is often used to show a new bounding area.

QRubberBand is generally used when we want to select multiple items at a time.

This example makes the use of following classes:

QRubberBand-Provides a rectangle or line that can indicate a selection or a boundary

Code Snippet

Header file

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QtGui/QWidget>
#include <QDesktopWidget>
#include <QApplication>
#include <QPixmap>
#include <QRubberBand>
#include <QMouseEvent>
#include <QPoint>
#include <QRect>
#include <QSize>
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = 0);
    ~Widget();
private:
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void mouseReleaseEvent(QMouseEvent *);
private:
    QRubberBand *rubberBand;
    QPoint mypoint;
};
 
#endif // WIDGET_H

cpp File

#ifndef WIDGET_H
#define WIDGET_H
 
#include "widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
 
 
}
 
Widget::~Widget()
{
 
}
void Widget::mousePressEvent(QMouseEvent *event)
 {
 
    mypoint = event->pos();
     rubberBand = new QRubberBand(QRubberBand::Rectangle, this);//new rectangle band
     rubberBand->setGeometry(QRect(mypoint, QSize()));
     rubberBand->show();
 }
 
 void Widget::mouseMoveEvent(QMouseEvent *event)
 {
     rubberBand->setGeometry(QRect(mypoint, event->pos()).normalized());//Area Bounding
 }
 
 void Widget::mouseReleaseEvent(QMouseEvent *event)
 {
     rubberBand->hide();// hide on mouse Release
 
 }

Screenshot