R2014b uipanel not showing on figure.

My uipanel is not showing up on the figure no matter what I do. I have no idea what I am doing wrong. I tried googling without success.

ComponentHeight = 60; 
    GUIheight =  13 * ComponentHeight;
    SettingsPanelWidth = 1000; 
    SettingsPanelHeight = 500;
    
    SettingsPanelPosition = [AlarmGatePosition(1), AlarmGatePosition(2)-50-SettingsPanelHeight, SettingsPanelWidth, SettingsPanelHeight];

    f = figure('Name', 'AlarmGate Settings', ...
           'NumberTitle', 'off', ...
           'Color', 'w',...
           'Units', 'pixels',...
           'ToolBar', 'none',...
           'HandleVisibility', 'on',...
           'Position', SettingsPanelPosition,...
           'Resize', 'off',...
           'Tag', 'AlarmGateSettings',...
           'MenuBar', 'none');
       
     infoPanelPosition = [50, SettingsPanelHeight*0.5, SettingsPanelWidth*0.6, SettingsPanelHeight*.45]; 

  infoPanel = uipanel('Parent', f,...
                         'Title', 'Recipients',...
                         'TitlePosition', 'lefttop',...
                         'Tag', 'infoPanel',...
                         'Position', infoPanelPosition,...
                         'Units','pixels',...
                         'BackgroundColor','blue',...
                         'FontSize', 12,...
                         'Visible', 'on',...
                         'HandleVisibility', 'on'...
                        );
    uistack(infoPanel, 'top')

[Jan]

What ois the value of AlarmGatePosition?

[Stephen Bartel]

Thank you for assisting me with this issue. These are the values in the vector:

The figure has no issue showing, it is just the panel that does not show up within the figure.

Note I also tried assigning a CreateFcn function to the figure, in which CreateFcn has the uipanel being created and assigned to hObject (figure). This did not resolve the issue.

AlarmGatePosition =

20 910 240 120

Answer 1

[Adam]

You need to define Units ahead of Position else the Position will be interpreted in default units (which are 'normalized') before the Units then get set to Pixels:

infoPanel = uipanel('Parent', f,...
                         'Title', 'Recipients',...
                         'TitlePosition', 'lefttop',...
                         'Tag', 'infoPanel',...
                         'Units','pixels',...
                         'Position', infoPanelPosition,...
                         'BackgroundColor','blue',...
                         'FontSize', 12,...
                         'Visible', 'on',...
                         'HandleVisibility', 'on'...
                        );

[Stephen Bartel]

Thank you so much. I did not realize order was necessarily important when it came to assigning property values. I thought first the properties are set, and then the object is created, based on the properties that have been set.

[Adam]

Yeah, I think that is true in many cases - e.g. it is a well known way of setting min, max, value properties on a slider rather than sequentially to avoid warning messages about it not being able to render because 'Value' is outside of the range of 'Min' to 'Max' etc.

I just had a vague recollection of having run into similar problems in the past when it came to units and positions. It feels like a bug, but it is probably considered a feature! I tested it in R2019a so its behaviour is the same as you are seeing in R2014b

[Stephen Bartel]

Since they haven't corrected it, I guess it is indeed a feature! Either way, thank you for bringing this to my attention.

Thanks

Stephen