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porthan
How to replace object in Reaction?
Posted on: 2016/7/29 16:29    #1
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Hi,

I am trying to replace Reaction object in my GUI but I can't get it working. What is correct procedure to replace objects?

APTR obj = CreateTextPreview(r, &r->TextAttr);

if (obj)
{
    if (SetGadgetAttrs(r->objs[FID_PREVIEWPARENT], r->winobj, NULL, LAYOUT_ModifyChild, r->objs[FID_PREVIEW], CHILD_ReplaceObject, obj, TAG_DONE) == 1)
    {
        RethinkLayout(r->objs[FID_PREVIEWPARENT], r->window, NULL, TRUE);
    }

    if (DoMethod(r->winobj, WM_RETHINK) == 0)
        DoMethod(r->winobj, WM_NEWPREFS);

    r->objs[FID_PREVIEW] = obj;
}


WM_RETHINK and WM_NEWPREFS were used in ClassACt sample code demonstrating dynamic GUI changes but seems these methods do nothing. RethinkLayout() I found from layout.gadget documentation but it does nothing either.

I tried RefreshGList() but it crashes.

static APTR CreateTextPreview(struct Data *r, struct TextAttr *font)
{
    return LabelObject,
        IA_Font, font,
        LABEL_Justification, LJ_CENTRE,
        LABEL_Text, "foobared",
    End;
}

LAYOUT_AddChild, r->objs[FID_PREVIEWPARENT] = LayoutObject,
    CHILD_Label, r->objs[FID_PREVIEW] = CreateTextPreview(r, r->textattr),
End,


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salass00
Re: How to replace object in Reaction?
Posted on: 2016/7/29 19:39    #2
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@porthan

CHILD_ReplaceObject is for gadgets only. For images you should use CHILD_ReplaceImage instead.

BTW if you just want a text area that you can change on the fly it's much simpler to use a borderless button and change the GA_Text with SetGadgetAttrs().
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porthan
Re: How to replace object in Reaction?
Posted on: 2016/7/30 9:00    #3
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Oh, I see. I try latter method, it is smarter.
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