PreferredWidth
fPreferredWidth += header->PreferredWidth();
float PreferredWidth() const;
float width = widget->PreferredWidth(this);
return fText->PreferredWidth(pose);
float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView* view) const;
virtual float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView*) const;
virtual float PreferredWidth(const BPoseView*) const = 0;