popupmenu

[mickey]

Hi , I'm try to insert an item in popupmenu, but problems with connnect to a SLOT

//MyWidget constructor
connect(this, SIGNAL(myUpdate()), myw, SLOT(myUpdateWidgets()) ); //this don't get error
myPopupmenu->insertItem("Zoom out",myw,SLOT(resetMoves() ),3);

//MyWidget constructor
connect(this, SIGNAL(myUpdate()), myw, SLOT(myUpdateWidgets()) ); //this don't get error
myPopupmenu->insertItem("Zoom out",myw,SLOT(resetMoves() ),3);

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QObject::connect: No such slot MainForm::resetMoves()
QObject::connect:  (sender name:   'unnamed')
QObject::connect:  (receiver name: 'MainForm')

QObject::connect: No such slot MainForm::resetMoves()
QObject::connect:  (sender name:   'unnamed')
QObject::connect:  (receiver name: 'MainForm')

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Why the first connect works and second get this message from console?

[zlatko]

have you declare it?

[mickey]

resetMoves() is a SLOT of myMainForm; I put myw to says this; but connect SEARCH it in MainForm....in mainForm there isn't! It's in myMainForm....

[mickey]

Hi, now I've tried this:

//constructor of myidget:
myPopupmenu->insertItem("WireFrame", this, SLOT(setWireframe(true)), 4);

//constructor of myidget:
myPopupmenu->insertItem("WireFrame", this, SLOT(setWireframe(true)), 4);

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The Errors are these:

QObject::connect: No such slot MyWidget::setWireframe(true)
QObject::connect:  (sender name:   'unnamed')
QObject::connect:  (receiver name: 'myWidget1')

QObject::connect: No such slot MyWidget::setWireframe(true)
QObject::connect:  (sender name:   'unnamed')
QObject::connect:  (receiver name: 'myWidget1')

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I don't understand: setWireframe(bool) there is and it's a slot; sender name unamed!?
Any hints?

[jacek]

I don't understand: setWireframe(bool) there is and it's a slot;

Yes, but you try to connect to "setWireframe(true)". You should already know that parameter names and values are forbidden inside SLOT and SIGNAL macros.

[mickey]

Is 'true' the problem? I change so and get still errors;
I'd like, when I selected item that setWirframe is called with parameter 'true'......

myPopupmenu->insertItem("WireFrame", this, SLOT(setWireframe(bool)), 4);

myPopupmenu->insertItem("WireFrame", this, SLOT(setWireframe(bool)), 4);

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QObject::connect: Incompatible sender/receiver arguments
        QSignal::signal(const QVariant&) --> MyWidget::setWireframe(bool)

QObject::connect: Incompatible sender/receiver arguments
        QSignal::signal(const QVariant&) --> MyWidget::setWireframe(bool)

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In any way I don't understand this error...

[jacek]

QObject::connect: Incompatible sender/receiver arguments
QSignal::signal(const QVariant&) --> MyWidget::setWireframe(bool)

You can't connect a signal with QVariant parameter to a slot with bool parameter. Both types must be the same.

[mickey]

Hi! then I tried so and is ok;

myPopupmenu->insertItem("WireFrame", this, SLOT(wire()), 4);
void MyWidget::wire() {
	printf("hi\n");
	this->setWireframe(true);
 
}

myPopupmenu->insertItem("WireFrame", this, SLOT(wire()), 4);
void MyWidget::wire() {
	printf("hi\n");
	this->setWireframe(true);

}

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Otherwise I thinked to insert a SLOT in myPopupmenu that should calls myWidget1->wireFrame(true). but how call setWireframe from a SLOT of myPopupmenu? (myWidget1 is member of myMainForm class) Thanks.

[jacek]

Otherwise I thinked to insert a SLOT in myPopupmenu that should calls myWidget1->wireFrame(true). but how call setWireframe from a SLOT of myPopupmenu? (myWidget1 is member of myMainForm class)

You would have to subclass QPopupMenu, but your current solution is OK.

[mickey]

sorry I am still here....I've already subclassed QpopupMenu; my question was (a C++ question): how to call MyWidget instance (myWidget1) from a MyPopupmenu SLOT?
(myMainForm has myWidget1 instance)

void MyPopupmenu::wireframe() {
	printf("hi\n");
         myWidget1->setWireframe(true); // how to call?
}

void MyPopupmenu::wireframe() {
	printf("hi\n");
         myWidget1->setWireframe(true); // how to call?
}

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[jacek]

how to call MyWidget instance (myWidget1) from a MyPopupmenu SLOT?

You must give a pointer to that widget to the MyPopupmenu instance. For example as one of the parameters of a constructor.

Since MyWidget is probably the parent of that menu you could use it:

// .h file
class MyWidget;
class MyPopupmenu : public QPopupMenu 
{
   Q_OBJECT
   public:
      MyPopupmenu( MyWidget *parent );
 
   private slots:
      void wireframe();
 
   private:
      MyWidget *_myWidget;
};
 
// .cpp file:
#include "MyWidget.h"
 
MyPopupmenu( MyWidget *parent ) : QPopupMenu( parent ), _myWidget( parent )
{
   // ... 
}
 
void wireframe() 
{
   if( _myWidget != 0 ) {
      _myWidget->setWireFrame( true );
   }
}

// .h file
class MyWidget;
class MyPopupmenu : public QPopupMenu 
{
   Q_OBJECT
   public:
      MyPopupmenu( MyWidget *parent );

   private slots:
      void wireframe();

   private:
      MyWidget *_myWidget;
};

// .cpp file:
#include "MyWidget.h"

MyPopupmenu( MyWidget *parent ) : QPopupMenu( parent ), _myWidget( parent )
{
   // ... 
}

void wireframe() 
{
   if( _myWidget != 0 ) {
      _myWidget->setWireFrame( true );
   }
}

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[mickey]

sorry,
but if can't call any SLOT with a parameter, I need to code many slot as the item in qpopmenu....I'm trying this....

myPopupmenu->insertItem(QPixmap::fromMimeSource("wireFrame.png"),
	"WireFrame", this, SLOT(CALLpopupmenu()), 0, 0, 1);
myPopupmenu->insertItem(QPixmap::fromMimeSource("zoom_in.png"),
		"Zoom in", this,  SLOT(CALLpopupmenu()), 0, 1, 2);
 
void MyWidget::CALLpopupmenu() {
	QPopupMenu* item = (QPopupMenu*)sender(); 
	cout << " item " << item << endl; //item hasn't the true value
 
}

myPopupmenu->insertItem(QPixmap::fromMimeSource("wireFrame.png"),
	"WireFrame", this, SLOT(CALLpopupmenu()), 0, 0, 1);
myPopupmenu->insertItem(QPixmap::fromMimeSource("zoom_in.png"),
		"Zoom in", this,  SLOT(CALLpopupmenu()), 0, 1, 2);

void MyWidget::CALLpopupmenu() {
	QPopupMenu* item = (QPopupMenu*)sender(); 
	cout << " item " << item << endl; //item hasn't the true value

}

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Is thre a way to do this? (in this way or others) thanks in advance

[jacek]

but if can't call any SLOT with a parameter,

You can invoke a slot with parameter, but its type must match the type of a corresponding signal parameter and you can't specify its value inside the SLOT macro.

I need to code many slot as the item in qpopmenu....

What's wrong with that? What do you want to do in those slots? What signals will be connected to them?

[mickey]

You can invoke a slot with parameter, but its type must match the type of a corresponding signal parameter and you can't specify its value inside the SLOT macro.

I'd like that wireFrame SLOT starts when I choose an item from myPopupmenu; inserteItem members can only set the receiver...where can I set sender?? Is eg. the item 2, a possilble sender?

What's wrong with that? What do you want to do in those slots? What signals will be connected to them?

Nothing wrong; but so I have some SLOT that calls SLOT; I think is good find a why to use only a SLOT called from item in myPopupmenu (every item has an index or an id); and inside it calls the slots... but I don't know how..

[jacek]

I'd like that wireFrame SLOT starts when I choose an item from myPopupmenu; inserteItem members can only set the receiver...where can I set sender?? Is eg. the item 2, a possilble sender?

As usual, the answer is in the docs:

void QPopupMenu::activated ( int id ) [signal]
This signal is emitted when a menu item is selected; id is the id of the selected item.
Normally, you connect each menu item to a single slot using QMenuData::insertItem(), but sometimes you will want to connect several items to a single slot (most often if the user selects from an array). This signal is useful in such cases.
See also highlighted() and QMenuData::insertItem().
Examples: grapher/grapher.cpp, helpviewer/helpwindow.cpp, qdir/qdir.cpp, qwerty/qwerty.cpp, scrollview/scrollview.cpp, and showimg/showimg.cpp.

Just connect to this signal instead of supplying slot names to insertItem() method.