XRC control client position is always (0,0)

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bigpilot
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XRC control client position is always (0,0)

Post by bigpilot »

I'm using wxPython to develop a form which has been constructed using XRC. On this form there are a couple of RichTextControls which are attached using AttachUnknownControl(). The form displays correctly, but when I attempt to retrieve the (client) position of the RichtText controls I always get back (0,0).

The XRC controls not created using AttachUnknownControl() do report their correct client position.

Has anyone had the same experience? How can I get the correct client position for the RichText controls?

P.S.: why doesn't XRC have support for RichText controls?
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DavidHart
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Re: XRC control client position is always (0,0)

Post by DavidHart »

Hi,

(I've no idea about the wxPython/AttachUnknownControl aspects of this question.)
P.S.: why doesn't XRC have support for RichText controls?
Doesn't it? The wx3.0.5 source contains src/xrc/xh_richtext.cpp. In fact, so does wx2.8.12.

Regards,

David
bigpilot
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Re: XRC control client position is always (0,0)

Post by bigpilot »

Looking at the implementation of AttachUnknownControl (src\xrc\xmlres.cpp):

Code: Select all

bool wxXmlResource::AttachUnknownControl(const wxString& name,
                                         wxWindow *control, wxWindow *parent)
{
    if (parent == NULL)
        parent = control->GetParent();
    wxWindow *container = parent->FindWindow(name + wxT("_container"));
    if (!container)
    {
        wxLogError("Cannot find container for unknown control '%s'.", name);
        return false;
    }
    return control->Reparent(container);
}
and the code of Reparent() (src\common\wincmn.cpp)

Code: Select all

bool wxWindowBase::Reparent(wxWindowBase *newParent)
{
    wxWindow *oldParent = GetParent();
    if ( newParent == oldParent )
    {
        // nothing done
        return false;
    }

    const bool oldEnabledState = IsEnabled();

    // unlink this window from the existing parent.
    if ( oldParent )
    {
        oldParent->RemoveChild(this);
    }
    else
    {
        wxTopLevelWindows.DeleteObject((wxWindow *)this);
    }

    // add it to the new one
    if ( newParent )
    {
        newParent->AddChild(this);
    }
    else
    {
        wxTopLevelWindows.Append((wxWindow *)this);
    }

    // We need to notify window (and its subwindows) if by changing the parent
    // we also change our enabled/disabled status.
    const bool newEnabledState = IsEnabled();
    if ( newEnabledState != oldEnabledState )
    {
        NotifyWindowOnEnableChange(newEnabledState);
    }

    return true;
}
Why is it reparenting to the "container"?
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bigpilot
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Re: XRC control client position is always (0,0)

Post by bigpilot »

I'm starting to understand the problem. When the XRC system sees an object of type "unknown" with name <name> it creates a panel with the name <name>_container and puts that in as a sort of placeholder.

When you call AttachUnknownControl() your control is actually added to the <name>_container wxPanel and the client position you get back is actually the position relative to the <name>_container, which is (0,0).

Now the question seems to be: how do I get the client position of my control relative to the parent of the <name>_container wxPanel?
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bigpilot
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Re: XRC control client position is always (0,0)

Post by bigpilot »

Now the question seems to be: how do I get the client position of my control relative to the parent of the <name>_container wxPanel?
To answer my own question:

controlA = control I want the client coordinates of relative to WindowB

pos = controlA.GetScreenPosition()
clientPos = WindowB.ScreenToClient(pos)

clientPos is the client position of ControlA as if it had WindowB as its parent.
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bigpilot
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Posts: 184
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Re: XRC control client position is always (0,0)

Post by bigpilot »

DavidHart wrote: Mon Jul 06, 2020 11:39 am Hi,

(I've no idea about the wxPython/AttachUnknownControl aspects of this question.)
P.S.: why doesn't XRC have support for RichText controls?
Doesn't it? The wx3.0.5 source contains src/xrc/xh_richtext.cpp. In fact, so does wx2.8.12.

Regards,

David
Thanks David.

I created an issue with the wxFormBuilder team: https://github.com/wxFormBuilder/wxForm ... issues/618
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