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Empty.m
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Wed, May 1, 19:35

Empty.m
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function obj = Empty( varargin )
%uix.Empty Create an empty space
%
% obj = uix.Empty() creates an empty space that can be used to add gaps
% between elements in layouts.
%
% obj = uix.Empty(param,value,...) also sets one or more property
% values.
%
% See the <a href="matlab:doc uix.Empty">documentation</a> for more detail and the list of properties.
%
% Examples:
% >> f = figure();
% >> box = uix.HBox( 'Parent', f );
% >> uicontrol( 'Parent', box, 'Background', 'r' )
% >> uix.Empty( 'Parent', box )
% >> uicontrol( 'Parent', box, 'Background', 'b' )
% Copyright 2009-2016 The MathWorks, Inc.
% $Revision: 1436 $ $Date: 2016-11-17 17:53:29 +0000 (Thu, 17 Nov 2016) $
% Create uicontainer
obj = matlab.ui.container.internal.UIContainer( 'Tag', 'empty', varargin{:} );
% Create property for Parent listener
p = addprop( obj, 'ParentListener' );
p.Hidden = true;
% Create Parent listener
obj.ParentListener = event.proplistener( obj, ...
findprop( obj, 'Parent' ), 'PostSet', @(~,~)onParentChanged(obj) );
% Create property for Parent color listener
p = addprop( obj, 'ParentColorListener' );
p.Hidden = true;
% Initialize color and listener
updateColor( obj )
updateListener( obj )
end % uix.Empty
function onParentChanged( obj )
%onParentColorChanged Event handler
% Update color and listener
updateColor( obj )
updateListener( obj )
end % onParentChanged
function onParentColorChanged( obj )
%onParentColorChanged Event handler
% Update color
updateColor( obj )
end % onParentColorChanged
function name = getColorProperty( obj )
%getColorProperty Get color property
names = {'Color','BackgroundColor'}; % possible names
for ii = 1:numel( names ) % loop over possible names
name = names{ii};
if isprop( obj, name )
return
end
end
error( 'Cannot find color property for %s.', class( obj ) )
end % getColorProperty
function updateColor( obj )
%updateColor Set uicontainer BackgroundColor to match Parent
parent = obj.Parent;
if isempty( parent ), return, end
property = getColorProperty( parent );
color = parent.( property );
try
obj.BackgroundColor = color;
catch e
warning( e.identifier, e.message ) % rethrow as warning
end
end % updateColor
function updateListener( obj )
%updateListener Create listener to parent color property
parent = obj.Parent;
if isempty( parent )
obj.ParentColorListener = [];
else
property = getColorProperty( parent );
obj.ParentColorListener = event.proplistener( parent, ...
findprop( parent, property ), 'PostSet', ...
@(~,~)onParentColorChanged(obj) );
end
end % updateListener

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