Application Designer Access elements on panel

Question

Larry McDermott 2020-4-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/518198-application-designer-access-elements-on-panel

评论： Larry McDermott 2020-4-24

Hello Community,

I've started migrating to the app developer (from GUIDE), and am finding a few questions I can't figure out.

The main one is that I like using Panels to segregate different functions, such as data input in one panel, configuration settings in a different panel etc.

If I read the value in an element (ex. textbox.Text or textbox.Value) I can do that on a callback from a button that is in the same panel.

If I try to access this field from a button callback that doesn't reside in the panel I get "Undefined variable" messages. For example:

In the panel SetupPanel I have a text box named txt-nRuns. If I put a button in the same SetupPanel I can read the value with "nruns=app.txt_nRuns.Value"

If I try to read the value from a button on the main form (or in another panel) I get the "undefined variable" response. It seems like it's treating the elements in the panel as local variables.

I tried different options likeb elow with no luck, any tips on what I'm doing wrong (or if this is not currently possible)?

nruns=app.txt_nRuns.Value

nruns=app.SetupPanel.txt_nRuns.Value

nruns=app.SetupPanel.app.txt_nRuns.Value

nruns=SetupPanel.app.txt_nRuns.Value

Thanks for any suggestions!

3 个评论
显示 1更早的评论隐藏 1更早的评论

Tommy 2020-4-15

在 MATLAB Online 中打开

In the following simple example I don't have this problem:

classdef app1 < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure        matlab.ui.Figure
        Panel           matlab.ui.container.Panel
        EditFieldLabel  matlab.ui.control.Label
        EditField       matlab.ui.control.EditField
        Panel2          matlab.ui.container.Panel
        Button          matlab.ui.control.Button
    end
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: Button
        function ButtonPushed(app, event)
            disp(app.EditField.Value)
        end
    end
    % Component initialization
    methods (Access = private)
        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';
            % Create Panel
            app.Panel = uipanel(app.UIFigure);
            app.Panel.Title = 'Panel';
            app.Panel.Position = [18 241 260 221];
            % Create EditFieldLabel
            app.EditFieldLabel = uilabel(app.Panel);
            app.EditFieldLabel.HorizontalAlignment = 'right';
            app.EditFieldLabel.Position = [20 159 56 22];
            app.EditFieldLabel.Text = 'Edit Field';
            % Create EditField
            app.EditField = uieditfield(app.Panel, 'text');
            app.EditField.Position = [91 159 100 22];
            % Create Panel2
            app.Panel2 = uipanel(app.UIFigure);
            app.Panel2.Title = 'Panel2';
            app.Panel2.Position = [338 153 260 221];
            % Create Button
            app.Button = uibutton(app.Panel2, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [21 155 100 22];
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = app1
            % Create UIFigure and components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end