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rINSTCONTROL/Utility functions/App utilities/linkGuiElementToCommand.m
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linkGuiElementToCommand.m
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% By using app.linked_elem_list, create a correspondence between a property
% of MyInstrument class (named prop_tag) and an element of the app gui
function linkGuiElementToCommand(app, elem, prop_tag, varargin)
p=inputParser();
% GUI control element
addRequired(p,'elem');
% Instrument command to be linked to the GUI element
addRequired(p,'prop_tag',@ischar);
% If input_presc is given, the value assigned to the instrument propery
% is related to the value x displayed in GUI as x/input_presc.
addParameter(p,'input_presc',1,@isnumeric);
% Add an arbitrary function for processing the value, read from the
% device before outputting it.
addParameter(p,'out_proc_fcn',@(x)x,@(f)isa(f,'function_handle'));
addParameter(p,'create_callback_fcn',@(x)0,@(f)isa(f,'function_handle'));
% For drop-down menues initializes entries automatically based on the
% list of values. Ignored for all the other control elements.
addParameter(p,'init_val_list',false,@islogical);
parse(p,elem,prop_tag,varargin{:});
% If the property is not present in the instrument class, disable the
% control
if ~isprop(app.Instr, prop_tag)
elem.Enable='off';
elem.Visible='off';
return
end
% If supplied command does not have read permission, issue warning.
if ~contains(app.Instr.CommandList.(prop_tag).access,'r')
fprintf(['Instrument command ''%s'' does not have read permission,\n',...
'corresponding gui element will not be automatically ',...
'syncronized\n'],prop_tag);
% Try switching color of the gui element to orange
warning_color = [0.93, 0.69, 0.13];
try
elem.BackgroundColor = warning_color;
catch
try
elem.FontColor = warning_color;
catch
end
end
end
% The property-control link is established by assigning the tag
% and adding the control to the list of linked elements
elem.Tag = ['Instr.',prop_tag];
app.linked_elem_list = [app.linked_elem_list, elem];
% If the create_callback_fcn is set, assign it to the
% ValueChangedFcn which passes the field input to the instument
if ~ismember('create_callback_fcn',p.UsingDefaults)
elem.ValueChangedFcn = feval(p.Results.create_callback_fcn);
% Make callbacks non-interruptible for other callbacks
% (but are still interruptible for timers)
try
elem.Interruptible = 'off';
elem.BusyAction = 'cancel';
catch
warning('Could not make callback for %s non-interruptible',...
prop_tag);
end
end
% If prescaler is given, add it to the element as a new property
if p.Results.input_presc ~= 1
if isprop(elem, 'InputPrescaler')
warning(['The InputPrescaler property already exists',...
' in the control element']);
else
addprop(elem,'InputPrescaler');
end
elem.InputPrescaler = p.Results.input_presc;
end
% Add an arbitrary function for output processing
if ~ismember('out_proc_fcn',p.UsingDefaults)
if isprop(elem, 'OutputProcessingFcn')
warning(['The OutputProcessingFcn property already exists',...
' in the control element']);
else
addprop(elem,'OutputProcessingFcn');
end
elem.OutputProcessingFcn = p.Results.out_proc_fcn;
end
% Auto initialization of entries, for dropdown menus only
if p.Results.init_val_list && isequal(elem.Type, 'uidropdown')
try
cmd_val_list = app.Instr.CommandList.(prop_tag).val_list;
if all(cellfun(@ischar, cmd_val_list))
% If the command has only string values, get the list of
% values ignoring abbreviations
cmd_val_list = stdValueList(app.Instr, prop_tag);
elem.Items = lower(cmd_val_list);
elem.ItemsData = cmd_val_list;
else
% Items in a dropdown should be strings, so convert if
% necessary
str_list=cell(length(cmd_val_list), 1);
for i=1:length(cmd_val_list)
if ~ischar(cmd_val_list{i})
str_list{i}=num2str(cmd_val_list{i});
end
end
elem.Items = str_list;
% Put raw values in ItemsData
elem.ItemsData = cmd_val_list;
end
catch
warning(['Could not automatically assign values',...
' when linking ',prop_tag,' property']);
end
end
end
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