Width of wxOwnerDrawnComboBox

[ArtDen]

I did my class derived from wxOwnerDrawnComboBox and overrided OnDrawItem, OnMeasureItemWidth, OnMeasureItem
The problem is the width of control doesn't fit width of text items. Comparison with wxChoice:

cb1.png (6.85 KiB) Viewed 824 times

wxChoice make its width correct here.

wxOwnerDrawnComboBox make popup list width correctly, but control's width is not Ok:

cb2.png (5.67 KiB) Viewed 824 times

What I have to do to get correct wxOwnerDrawnComboBox width?

PS: wx 3.0.4, MS Windows, VC
PPS: I filled my control with items before I called GetSizer()->SetSizeHints(this);

[doublemax]

From the docs:

Implementing item drawing and measuring is similar to wxVListBox. Application needs to subclass wxOwnerDrawnComboBox and implement OnDrawItem(), OnMeasureItem() and OnMeasureItemWidth().

Did you do implement OnMeasureItemWidth()? I don't see how the control can know the correct width without it.

[ArtDen]

I did

[PB]

Assuming that the layout algorithm uses the best size for the control which is implemented as

Code: Select all

wxSize wxOwnerDrawnComboBox::DoGetBestSize() const
{
    if ( GetCount() == 0 )
        return wxComboCtrlBase::DoGetBestSize();

    wxOwnerDrawnComboBox* odc = const_cast<wxOwnerDrawnComboBox*>(this);
    // TODO: this class may also have GetHightestItemHeight() and
    // GetHightestItem() methods, and so set the whole (edit part + arrow)
    // control's height according with this max height, not only max width.
    return GetSizeFromTextSize(odc->GetWidestItemWidth());
}

then perhaps this generic implementation may not be the best way when one has a real information about the item widths...