keyevent/zoom

[bhogasena]

hi,
i have written code in keypressevent like below

void GLWidget::KeyPressEvent(QKeyEvent *event) 
{
	switch(event->key())
	{
	case Qt::Key_Home : 
 
			sBoundingBox.fMinX=-180;
			sBoundingBox.fMinY=-90;
			sBoundingBox.fMaxX=+180;
			sBoundingBox.fMaxY=+90;
 
				 break;
	case Qt::Key_Plus : 
 
			sBoundingBox.fMinX += 1000.0;
			sBoundingBox.fMaxX -= 1000.0;
			sBoundingBox.fMinY += 1000.0;
			sBoundingBox.fMaxY -= 1000.0;
 
				break;
	case Qt::Key_Minus : 
			sBoundingBox.fMinX -= 1000.0;
			sBoundingBox.fMaxX += 1000.0;
			sBoundingBox.fMinY -= 1000.0;
			sBoundingBox.fMaxY += 1000.0;
 
				break;
	}
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
 
	glOrtho(sBoundingBox.fMinX, sBoundingBox.fMaxX,sBoundingBox.fMinY,sBoundingBox.fMaxY,-1,1);
	glMatrixMode(GL_MODELVIEW);
	//glIdleFunc(paintGL);
	paintGL();
}

void GLWidget::KeyPressEvent(QKeyEvent *event) 
{
	switch(event->key())
	{
	case Qt::Key_Home : 
			
			sBoundingBox.fMinX=-180;
			sBoundingBox.fMinY=-90;
			sBoundingBox.fMaxX=+180;
			sBoundingBox.fMaxY=+90;
				 
				 break;
	case Qt::Key_Plus : 
	
			sBoundingBox.fMinX += 1000.0;
			sBoundingBox.fMaxX -= 1000.0;
			sBoundingBox.fMinY += 1000.0;
			sBoundingBox.fMaxY -= 1000.0;
		
				break;
	case Qt::Key_Minus : 
			sBoundingBox.fMinX -= 1000.0;
			sBoundingBox.fMaxX += 1000.0;
			sBoundingBox.fMinY -= 1000.0;
			sBoundingBox.fMaxY += 1000.0;
							 
				break;
	}
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	
	glOrtho(sBoundingBox.fMinX, sBoundingBox.fMaxX,sBoundingBox.fMinY,sBoundingBox.fMaxY,-1,1);
	glMatrixMode(GL_MODELVIEW);
	//glIdleFunc(paintGL);
	paintGL();
}

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but program is not enterint at all into this fuction
can anyone help me?
thanks and regards
k. bhogasena reddy

[jpn]

Perhaps your GL widget doens't have keyboard focus.

[bhogasena]

i have setfocuspolicy(strongfocus) in qglwidget constructor

[jpn]

There seems to be a typo in the function name. It's keyPressEvent, not KeyPressEvent.

[bhogasena]

eventhogh i have changed it to keyPressEvent it's not working
could you please help me in this regard so that i'll be thankful to you.

[jpn]

So does it have focus or not? Setting a focus policy doesn't mean it actually has focus. You can set the focus with QWidget::setFocus() and you can get the currently focused widget with QApplication::focusWidget().

[bhogasena]

in setFocus(Qt::FocusReason) what i have to put for "reason"

[jpn]

There's an overload (a slot) provided for convenience that takes no parameters at all. It calls setFocus(Qt::OtherFocusReason).