Why findobj cannot find a TexBox (annotation) object?

2020 12 4
2 个回答
回答已采纳
更新时间：2020 12 4
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0 个投票

While HandleVisibility property of a TextBox object is 'on' by default,
fig = figure
txb = annotation('textbox',[0.5 0.5 0.5 0.5],'String','bar hoo')
class(txb)
ans =
'matlab.graphics.shape.TextBox'
txb.Type %
ans = 'textboxshape'
txb.HandleVisibility
ans = 'on'
findobj cannot find this txb.
findobj(fig,'Type','textboxshape')
ans =
0×0 empty GraphicsPlaceholder array.
Why is this and how can I find this txb?

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 采纳的回答

Cris LaPierre
Cris LaPierre 2020-12-4
编辑：Cris LaPierre 2020-12-4
Ran in:

3 个投票

Ran in:
Try using the object handle (txb) directly.
plot(1:10)
str = 'Straight Line Plot from 1 to 10';
txb = annotation('textbox',[.2 .5 .3 .3],'String',str,'FitBoxToText','on');
●
% Use object handle
findobj(txb)
ans =
TextBox (Straight Line Plot from 1 to 10) with properties: String: 'Straight Line Plot from 1 to 10' FontName: 'Helvetica' FontSize: 10 FontWeight: 'normal' Color: [0 0 0] BackgroundColor: 'none' EdgeColor: [0 0 0] LineStyle: '-' LineWidth: 0.5000 Position: [0.2000 0.5000 0.3000 0.3000] Units: 'normalized' Show all properties
If you want to instead find the annotation without using the object handle, use findall instead.
findall(gcf,'Type','textboxshape')
ans =
TextBox (Straight Line Plot from 1 to 10) with properties: String: 'Straight Line Plot from 1 to 10' FontName: 'Helvetica' FontSize: 10 FontWeight: 'normal' Color: [0 0 0] BackgroundColor: 'none' EdgeColor: [0 0 0] LineStyle: '-' LineWidth: 0.5000 Position: [0.2000 0.5000 0.3000 0.3000] Units: 'normalized' Show all properties

4 个评论
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Uh-huh, I totally missed the existence of findall, the very function for my case. Thanks!
Besides, the ducumentation of findobj doesn't really say you cannot use a figure object as the first input argument of fingobj, does it?
In one of the examples, gcf is used with fingobj:
h2 = findobj(gcf,'-depth',2)
Cris LaPierre
Cris LaPierre 2020-12-4
Good point. The underlying issue was handle visibility, as you pointed out below. I'll update my response to remove any confusion.

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更多回答（1 个）

1 个投票

It turned out that TextBox txb is a child of an AnnotationPane or 'matlab.graphics.shape.internal.AnnotationPane' object. And HandleVisibility of AnnotationPane objects are 'off' by default, hiding the handle of TextBox txb.
So you need to set HandleVisibility of AnnotationPane objects to 'on' first, and then use findobj.
set(findobj(allchild(fig),'Type','AnnotationPane'),...
'HandleVisibility','on')
findobj(fig,'Type','textboxshape') % WORKS!
ans =
TextBox (bar hoo) with properties:
String: 'bar hoo'
FontName: 'Helvetica'
FontSize: 10
FontWeight: 'normal'
Color: [0 0 0]
BackgroundColor: 'none'
EdgeColor: [0 0 0]
LineStyle: '-'
LineWidth: 0.5000
Position: [0.5000 0.5000 0.5000 0.5000]
Units: 'normalized'
Show all properties

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