Drag problem to setStartDragTime

[duduqq]

In my program I used QApplication::setStartDragDistance(30),QApplicatio n::setStartDragTime(1000) to changed ths drag start time and the distance,but it not work ,it also drag immediately
the code is like this,can you help me.

.H

#ifndef QDRAPBUTTON_H
#define QDRAPBUTTON_H
 
#include <QPushButton>
#include <QApplication>
 
QT_BEGIN_NAMESPACE
class QDragEnterEvent;
class QDragMoveEvent;
QT_END_NAMESPACE
 
class QDrapButton : public QPushButton
{
public:
    QDrapButton(QWidget *parent);
protected:
    void mousePressEvent(QMouseEvent *event);
	void mouseMoveEvent(QMouseEvent *event) ;
private:
};
 
#endif

#ifndef QDRAPBUTTON_H
#define QDRAPBUTTON_H

#include <QPushButton>
#include <QApplication>

QT_BEGIN_NAMESPACE
class QDragEnterEvent;
class QDragMoveEvent;
QT_END_NAMESPACE

class QDrapButton : public QPushButton
{
public:
    QDrapButton(QWidget *parent);
protected:
    void mousePressEvent(QMouseEvent *event);
	void mouseMoveEvent(QMouseEvent *event) ;
private:
};

#endif

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.CPP

#include <QtGui>
 
#include "QDrapButton.h"
bool m_bMove ;
int m_nMoveX ;
int m_nMoveY ;
QDrapButton::QDrapButton(QWidget *parent)
    : QPushButton(parent)
{
	QApplication::setStartDragDistance(30) ;
	QApplication::setStartDragTime(1000) ;
	m_bMove = false ;
	m_nMoveX = 0 ;
	m_nMoveY = 0 ;
}
 
void QDrapButton::mousePressEvent(QMouseEvent *event)
{
	QPoint hotSpot = event->pos();
 
    QMimeData *mimeData = new QMimeData;
    mimeData->setText(objectName());
    mimeData->setData("application/x-hotspot",
                      QByteArray::number(hotSpot.x())
                      + " " + QByteArray::number(hotSpot.y()));
	 mimeData->setImageData(icon()) ;
    QPixmap pixmap(size());
    render(&pixmap);
 
    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setPixmap(pixmap);
    drag->setHotSpot(hotSpot);
 
    Qt::DropAction dropAction = drag->start();
 
    if (dropAction == Qt::MoveAction)
     {
        close();
        update();
    }
   return QPushButton::mousePressEvent(event) ;
}
 
void QDrapButton::mouseMoveEvent(QMouseEvent *event)
{
	 QPoint newPoint = event->pos() ;
	m_nMoveX = 0 ;
	m_nMoveY = 0 ;
}

#include <QtGui>

#include "QDrapButton.h"
bool m_bMove ;
int m_nMoveX ;
int m_nMoveY ;
QDrapButton::QDrapButton(QWidget *parent)
    : QPushButton(parent)
{
	QApplication::setStartDragDistance(30) ;
	QApplication::setStartDragTime(1000) ;
	m_bMove = false ;
	m_nMoveX = 0 ;
	m_nMoveY = 0 ;
}

void QDrapButton::mousePressEvent(QMouseEvent *event)
{
	QPoint hotSpot = event->pos();

    QMimeData *mimeData = new QMimeData;
    mimeData->setText(objectName());
    mimeData->setData("application/x-hotspot",
                      QByteArray::number(hotSpot.x())
                      + " " + QByteArray::number(hotSpot.y()));
	 mimeData->setImageData(icon()) ;
    QPixmap pixmap(size());
    render(&pixmap);

    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);
    drag->setPixmap(pixmap);
    drag->setHotSpot(hotSpot);

    Qt::DropAction dropAction = drag->start();

    if (dropAction == Qt::MoveAction)
     {
        close();
        update();
    }
   return QPushButton::mousePressEvent(event) ;
}

void QDrapButton::mouseMoveEvent(QMouseEvent *event)
{
	 QPoint newPoint = event->pos() ;
	m_nMoveX = 0 ;
	m_nMoveY = 0 ;
}

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[aamer4yu]

First, you are overriding mousePressEvent, and starting the draf urself.
How can you expect the QApplication setting to work ?

You need to check those values when starting the drag urself

[duduqq]

Thank you
but if I do not overriding the QPushButton's mousePressEvent,how can I make the QPushButton can drag when mouse press.And how can I make the QApplication::setStartDragTime work.

[aamer4yu]

You can make a check yourself like -

if ((startPos - currentPos).manhattanLength() >=QApplication::startDragDistance()
&& elapsedTime > qApp->startDragTime() ) 
{
     startTheDrag(); 
}

if ((startPos - currentPos).manhattanLength() >=QApplication::startDragDistance()
&& elapsedTime > qApp->startDragTime() ) 
{
     startTheDrag(); 
}

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I hope u get the idea

[duduqq]

Thank you ,I know the problem now ;