ToolTip....

[merry]

Hi all

Working on Qt4.2 for MAC

Can any body tells me that , How can The tooltip for the button should be shown in some Image say "balloon".



Thanx

[merry]

Hi....

I mean How can I display the tooltip for the QPushbutton in an image

image can be of anytype

1. Circle
2. balloon
3. triangle etc .....


Thanx

[marcel]

So you want to display an image with a QToolTip.
Should be easy enough if you subclass QToolTip and override its paintEvent.
The image, for example the triangle should contain the triangle in a specific color and the rest has to be a color different from the one the triangle has.
This is to be able to create a heuristic mask (make the image transparent around the triangle ).

QPixmap tipPix;
//.. load the pixmap
tipPix.setMask(tipPix.createHeuristicMask());

QPixmap tipPix;
//.. load the pixmap
tipPix.setMask(tipPix.createHeuristicMask());

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Another solution is to use a transparent png.

Regards

[merry]

Thanx 4 the sol.

But I dont want to display an image with the tooltip . I want to display toolTip (Text) in the balloon image....

for eg.

If I set the tooltip for the button ... It is drawn immediately below the given position in a distinctive black-on-yellow color combination in a rectangle, right , Now Instead of that rectangle I want to use balloon.

Thanx

[marcel]

Yes, for that you will have to use custom drawing.
Tool tips are platform dependent. So on windows they actually look like a balloon.

If you want them to look like that on Mac, then you have to paint them yourself. Either by using images, or drawing primitives, whatever.
Since you are on a Mac, you could take advantage of the desktop composition features and add some need effects to it, like transparent gradations, etc.

Regards

[merry]

THANX 4 the soln.

But I dont know how to do custom drawing...

Can u Explain me it with example

thanx

[merry]

Ok I 'll draw it using images and drawing primitives ..
but how can i set it for the tooltip , so that tooltip should be displyed in that balloon.

[marcel]

Custom drawing is not that hard in general, but this tooltip problem will be pretty hard to solve.

First of all, you have to subclass the event() function for the widget you want the tip to appear.
In the event function you will look for a QHelpEvent, whose type is QEvent::ToolTip. This means that the widget is requested to show a tool tip.

The second step is to subclass QToolTip and override the paintEvent. In paintEvent you do all the drawing.

bool SomwWidget::event(QEvent* e)
{
 QHelpEvent *he = static_cast<QHelpEvent*>(e);
 if(he && he->type() == QEvent::ToolTip)
 {
   if(!mCustomToolTip)
     mCustomToolTip = new CustomToolTip(this);
   mCustomToolTip->show();
   e->accept();
   return true;
  }
 else 
 {
   if(mCustomToolTip)
     mCustomToolTip->hide();
 }
 return QWidget::event(e);
}

bool SomwWidget::event(QEvent* e)
{
 QHelpEvent *he = static_cast<QHelpEvent*>(e);
 if(he && he->type() == QEvent::ToolTip)
 {
   if(!mCustomToolTip)
     mCustomToolTip = new CustomToolTip(this);
   mCustomToolTip->show();
   e->accept();
   return true;
  }
 else 
 {
   if(mCustomToolTip)
     mCustomToolTip->hide();
 }
 return QWidget::event(e);
}

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mCustomToolTip should be a member of your widget's class, which you initialize to NULL in the constructor.

For the paintEvent:

void CustomToolTip::paintEvent() 
{
  QPainter p(this);
  p.fillRect(rect(), Qt::transparent );
  p.setBrush(Qt::red);
  p.drawEllipse(rect()); 
}

void CustomToolTip::paintEvent() 
{
  QPainter p(this);
  p.fillRect(rect(), Qt::transparent );
  p.setBrush(Qt::red);
  p.drawEllipse(rect()); 
}

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This draws a red ellipse on a transparent background.
It is just an example. You could customize the drawing further.

Regards

[merry]

Thanx 4 the solution

Ok I ' ll try the solution.....

[merry]

Hi Marcel

mCustomToolTip should be a member of your widget's class, which you initialize to NULL in the constructor.

Pls Explain the above line...

Is it the member of the Subclass QToolTip.

Thanx

[marcel]

No.
Let's assume that you want the custom tooltip be displayed for a button.
Then you need to subclass QPushButton and override its event() function, where you put the code I've shown you earlier.
The custom tooltip should be a member of this subclass.

BTW, for what widget(s) you want a custom tooltip to be displayed?

Regards

[merry]

Hi...

if(!mCustomToolTip)
     mCustomToolTip = new CustomToolTip(this);
   mCustomToolTip->show();

if(!mCustomToolTip)
     mCustomToolTip = new CustomToolTip(this);
   mCustomToolTip->show();

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but in the above code u sent to me , Custom ToolTip is the SubClass Of QToolTip ..

but now u said that the custom tooltip should be a member of QPushbutton subclass.

Pls once again u view the code u sent to me and Explain it to me

Thanx