Question about the MouseMoveEvent of qtdemo's TextButton

[yzdying]

When I was add "item->setFlags(QGraphicsItem::ItemIsMovable);" in menumanager.cpp

First, One can move to what the mouse move.But second time to move the item,it will jump to the Original pos of first time.

What the problem is ?

[yzdying]

Nobody know?

[high_flyer]

Speaking only for me, I just don't understand what you wrote.
Try to explain more in details, and add code.

[yzdying]

Think you high_flyer, My English is no good,
I would like to use MouseMoveEvent event of Textbutton, so that I can drag the item to the specified location.
I add the flag "QGraphicsItem::ItemIsMovable" to item in menumanager.cpp

void MenuManager::createMenu(const QDomElement &category, BUTTON_TYPE type)
{
			.........
 
            // create normal menu button
            QString label = currentNode.toElement().attribute("name");
            item = new TextButton(label, TextButton::LEFT, type, this->window->scene, this->window->mainSceneRoot);
            currentNode = currentNode.nextSibling();
 
            item->setFlags(QGraphicsItem::ItemIsMovable);
 
			.........
}

void MenuManager::createMenu(const QDomElement &category, BUTTON_TYPE type)
{
			.........

            // create normal menu button
            QString label = currentNode.toElement().attribute("name");
            item = new TextButton(label, TextButton::LEFT, type, this->window->scene, this->window->mainSceneRoot);
            currentNode = currentNode.nextSibling();

            item->setFlags(QGraphicsItem::ItemIsMovable);

			.........
}

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First, Drag a item to specified location . When I click the leftbutton and start to drag the item,it will jump to (0 ,0) before the mouse moving.

I drag dowm a item from the location of (59, 233) to the specified location of (59, 236);
drag item pos output:
QPointF(59, 233)
QPointF(0, 1)
QPointF(0, 2)
QPointF(0, 3)

As you can see, the moving graber jump from (59, 233) to (0, 1).

So I don't know what cause this result.

You can have a try to drag.

[high_flyer]

Please provide the code that deals with the moving, and setting of coordinates.

[yzdying]

void TextButton::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    qDebug() << pos();
    QGraphicsItem::mouseMoveEvent(event);
}

void TextButton::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    qDebug() << pos();
    QGraphicsItem::mouseMoveEvent(event);
}

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Only to add the pos output. and Nothing modited to the qtdemo source besides added the ItemIsMovoble flag;

the moving graber is in scene coordinates

[high_flyer]

But where is the code that sets the position in your code?

[yzdying]

Thanks again!

//TextButton.cpp
void TextButton::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    qDebug() << pos();
    QGraphicsItem::mouseMoveEvent(event);
}

//TextButton.cpp
void TextButton::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    qDebug() << pos();
    QGraphicsItem::mouseMoveEvent(event);
}

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menumanager.cpp
void MenuManager::createMenu(const QDomElement &category, BUTTON_TYPE type)
{
			.........
 
            // create normal menu button
            QString label = currentNode.toElement().attribute("name");
            item = new TextButton(label, TextButton::LEFT, type, this->window->scene, this->window->mainSceneRoot);
            currentNode = currentNode.nextSibling();
 
            item->setFlags(QGraphicsItem::ItemIsMovable);    ///this line is my added
 
			.........
}

menumanager.cpp
void MenuManager::createMenu(const QDomElement &category, BUTTON_TYPE type)
{
			.........

            // create normal menu button
            QString label = currentNode.toElement().attribute("name");
            item = new TextButton(label, TextButton::LEFT, type, this->window->scene, this->window->mainSceneRoot);
            currentNode = currentNode.nextSibling();

            item->setFlags(QGraphicsItem::ItemIsMovable);    ///this line is my added

			.........
}

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Only modified two places in the source of qtdemo.
But course that the moving item jump from (59, 233) to (0, 1) in the procedure of qtdemo.