[Qt-interest] layout problems with QLabel with automatic eliding

[David Boosalis]

Hi Andrew.

Take a look at KDE's KSqueezedTextLabel, which is based on QLabel.
http://api.kde.org/4.x-api/kdelibs-apidocs/kdeui/html/classKSqueezedTextLabel.html

-David


On Thu, Aug 13, 2009 at 9:58 AM, Andrew Batishko<abatishko at attensity.com> wrote:
> I wanted a class that would allow me to display a label that would take
> up as much space as possible without forcing the window to resize, and
> would automatically elide if the text was longer than could be
> displayed. I came up with the class below.
>
> The problem is that this only works properly for cases where the label
> is placed in a QVBoxLayout, or in a QHBoxLayout where it's the only item
> in the layout with a stretch factor of 1.
>
> This means that it doesn't work (for example) in a case where you want
> the label immediately followed (no extra space) by a "..." button, and
> then followed by extra unused space, something such as the following
> where "val1, val2, val3" are the auto-eliding label part.
>
> |                                                           |
> | Items: val1, val2, val3 [...]                 [] checkbox |
> |                                                           |
>
> Has anyone successfully put something like this together or have any
> ideas on how to accomplish this? I've tried messing around with various
> options on size policies and such, but with no luck.
>
> Andrew
>
> class AutoSizeLabel:public QLabel {
>   Q_OBJECT
>  public:
>   AutoSizeLabel(const QString &text, QWidget *parent):QLabel(parent, f) {
>     setSizePolicy(QSizePolicy(QSizePolicy::Ignored,
> QSizePolicy::Preferred));
>     setText(text);
>   }
>
>   QString text(void) const { return fullText; }
>
>  public slots:
>   void setText(const QString &newText) {
>     fullText = newText;
>     QString elided = fontMetrics().elidedText(fullText, Qt::ElideRight,
> width());
>     if (elided == fullText) {
>       setToolTip(QString());
>       QLabel::setText(fullText);
>     }
>     else {
>       setToolTip(fullText);
>       QLabel::setText(elided);
>     }
>   }
>
>  protected:
>   virtual void resizeEvent(QResizeEvent *) {
>     setText(fullText);
>   }
>
>  private:
>   QString fullText;
> };
>
>
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