problem with QSplitter

[tangtao_xp]

Hi, all

I still have problem with the QSplitter. As described below, I try to get the deltaSize, pls refer to the code below:

// in Widget.cpp
Widget::Widget(QWidget *parent)
{
    layout = new QHBoxLayout(this);
    mySplitter = new MySplitter(this);
 
    frame1 = new QFrame();
    frame2 = new QFrame();
 
    mySplitter->addWidget(frame1);
    mySplitter->addWidget(frame2);
 
    layout->addWidget(mySplitter);
    this->setLayout(layout);
 
    this->resize(200, 200);
 
    // always returns (0, 0), I don't know why.
    qDebug() << mySplitter->sizes();
}
 
// in MySplitter.cpp
MySplitter::MySplitter(Qt::Orientation ori, QWidget *parent):
    QSplitter(ori, parent)
{
    if (this->parentWidget() == NULL)
    return;
 
    this->setOpaqueResize(false);
    this->setChildrenCollapsible(false);
 
    qDebug() << mySplitter->sizes();
    originalSizes = this->sizes();
 
    connect(this, SIGNAL(splitterMoved(int,int)), this, SLOT(keepSizeMove(int,int)));
}
 
void MySplitter::keepSizeMove(int pos, int index)
{
    if (this->parentWidget() == NULL)
        return;
 
    QList<int> newSizes = this->sizes();
    int originalSize = originalSizes.at(index - 1);
    int newSize = newSize.at(index - 1);
    int deltaSize = newSize - originalSize;
 
    int width = this->parentWidget()->width();
    int height = this->parentWidget()->height();
 
    ... ...
 
    if (this->orientation() == Qt::Horizontal)
    {
        this->parentWidget()->resize(width + deltaSize, height);
    }
    else
    {
        this->parentWidget()->resize(width, height + deltaSize);
    }
 
    this->parentWidget()->repaint();
}

// in Widget.cpp
Widget::Widget(QWidget *parent)
{
    layout = new QHBoxLayout(this);
    mySplitter = new MySplitter(this);

    frame1 = new QFrame();
    frame2 = new QFrame();

    mySplitter->addWidget(frame1);
    mySplitter->addWidget(frame2);

    layout->addWidget(mySplitter);
    this->setLayout(layout);

    this->resize(200, 200);

    // always returns (0, 0), I don't know why.
    qDebug() << mySplitter->sizes();
}

// in MySplitter.cpp
MySplitter::MySplitter(Qt::Orientation ori, QWidget *parent):
    QSplitter(ori, parent)
{
    if (this->parentWidget() == NULL)
    return;

    this->setOpaqueResize(false);
    this->setChildrenCollapsible(false);

    qDebug() << mySplitter->sizes();
    originalSizes = this->sizes();

    connect(this, SIGNAL(splitterMoved(int,int)), this, SLOT(keepSizeMove(int,int)));
}

void MySplitter::keepSizeMove(int pos, int index)
{
    if (this->parentWidget() == NULL)
        return;

    QList<int> newSizes = this->sizes();
    int originalSize = originalSizes.at(index - 1);
    int newSize = newSize.at(index - 1);
    int deltaSize = newSize - originalSize;

    int width = this->parentWidget()->width();
    int height = this->parentWidget()->height();

    ... ...

    if (this->orientation() == Qt::Horizontal)
    {
        this->parentWidget()->resize(width + deltaSize, height);
    }
    else
    {
        this->parentWidget()->resize(width, height + deltaSize);
    }

    this->parentWidget()->repaint();
}

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my problem is : "originalSizes" always get (0, 0).

I try to use "setSizes()" and "originalSizes" will get value but a wrong value.(setSizes() fails)

// in Widget.cpp
Widget::Widget(QWidget *parent)
{
    ... ...
 
    this->resize(200, 200);
 
    QList<int>sizes;
    sizes << 100 << 100;
    mySplitter->setSizes(sizes);
 
    // returns (20, 21), setSizes() fails!
    qDebug() << mySplitter->sizes();
}

// in Widget.cpp
Widget::Widget(QWidget *parent)
{
    ... ...

    this->resize(200, 200);

    QList<int>sizes;
    sizes << 100 << 100;
    mySplitter->setSizes(sizes);

    // returns (20, 21), setSizes() fails!
    qDebug() << mySplitter->sizes();
}

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I googled and found that none had solved yet. (refer to http://www.qtcentre.org/archive/index.php/t-26520.html)

Need help!


Thank you in advance!


Tang Tao

[ChrisW67]

You are constructing your MySplitter instance at line 5 of your first listing. At this point in time it has no widgets to split but you are assuming it does. Until you have added widgets to the splitter and the widget containing the splitter is shown there are no sizes.

[tangtao_xp]

You are constructing your MySplitter instance at line 5 of your first listing. At this point in time it has no widgets to split but you are assuming it does. Until you have added widgets to the splitter and the widget containing the splitter is shown there are no sizes.

Thank you, ChrisW67! It works! I should call sizes() until the parent widget is shown.

Now, I think I could go on with my work.



Tang Tao