How to update layout after widget visibility change ?

[phenoboy]

When I hide one widget in the program the layout is not updated/resized until I manually resize the window with a mouse.

Is there a way to update/refresh layout after I hide widgets inside a layout ?

[wagmare]

look at
setSizeConstraint of Layout
setSizeConstraint ( SizeConstraint )

may be u need
setSizeConstraint(QLayout::SetFixedSize);

check the example
http://harmattan-dev.nokia.com/docs/...extension.html

[wysota]

When I hide one widget in the program the layout is not updated/resized until I manually resize the window with a mouse.

Is there a way to update/refresh layout after I hide widgets inside a layout ?

Show the code please.

[phenoboy]

Show the code please.

I think I narrowed down the code to this. MyLabel is inherited from QLabel. I want it to change size (to maximum space) when I resize the window. It looks like it is not resizing automatically after this resize event. Is there some method I'm missing here ?

void MyLabel::resizeEvent(QResizeEvent* ev)
{
    int minPointSize=14;
    const QSize& sz=ev->size();
    const QFont& fnt=font();
    QFont f=fnt;
 
    qDebug() << "Resize event:" << sz << "pixelsize:" << f.pixelSize()
             << "." << f.pointSize();
 
    f.setPointSize(sz.height()/2);
 
    if (f.pointSize() < minPointSize) {
        f.setPointSize(minPointSize);
    }
 
    setFont(f);
 
}

void MyLabel::resizeEvent(QResizeEvent* ev)
{
    int minPointSize=14;
    const QSize& sz=ev->size();
    const QFont& fnt=font();
    QFont f=fnt;

    qDebug() << "Resize event:" << sz << "pixelsize:" << f.pixelSize()
             << "." << f.pointSize();

    f.setPointSize(sz.height()/2);

    if (f.pointSize() < minPointSize) {
        f.setPointSize(minPointSize);
    }

    setFont(f);

}

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[wysota]

What exactly do you mean that it is not "resizing automatically"? A resizeEvent is triggered after a resize, not before a resize. If you get a resizeEvent then the widget has already been resized.

[phenoboy]

What exactly do you mean that it is not "resizing automatically"? A resizeEvent is triggered after a resize, not before a resize. If you get a resizeEvent then the widget has already been resized.

Some more code.. The main widget contains three components (in different layouts). One is gauge, lcdnumber and a label. In this function I'm either showing gauge and hiding lcd or hiding gauge and showing lcd. Also I'm rearranging widgets because I want text label to be first. I was thinking that when layout is changed -> resize event is triggered and label is updated.

Now what happens when switching to condition noGauge==false is that gauge is hidden and font is resized correctly BUT the window size doesn't change and text that label contains is not shown fully . Only when I resize main window then label gets resized correctly and it shows full text

void switchView() {
    if (noGauge) {
        m_gauge->setVisible(true);
        ui->lcdNumber->setHidden(true);        
        noGauge=false;        
    } else {
        m_gauge->setVisible(false);
        ui->lcdNumber->setVisible(true);        
        ui->layoutLCDTop->removeWidget(label);
        ui->layoutLCDTop->addWidget(label);
        ui->layoutLCDTop->addWidget(ui->lcdNumber);
 
        noGauge=true;
    }
}

void switchView() {
    if (noGauge) {
        m_gauge->setVisible(true);
        ui->lcdNumber->setHidden(true);        
        noGauge=false;        
    } else {
        m_gauge->setVisible(false);
        ui->lcdNumber->setVisible(true);        
        ui->layoutLCDTop->removeWidget(label);
        ui->layoutLCDTop->addWidget(label);
        ui->layoutLCDTop->addWidget(ui->lcdNumber);
       
        noGauge=true;
    }
}

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[wysota]

Changing the widget position does not cause a resize. If you want to update widget contents, call update() on it and a paint event will be scheduled.