Why findobj cannot find a TexBox (annotation) object?

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Kouichi C. Nakamura
评论： Kouichi C. Nakamura 2020-12-4
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:
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
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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）

Kouichi C. Nakamura
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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