MATLAB GUI 中的 ListBox 组件

MATLAB 是一种基于矩阵的计算环境，具有自己的编程语言，易于学习和使用。在 MATLAB 的 GUI 图形用户界面的帮助下，它被用来理解复杂的数学思想和大型数据集。

列表框是在列表中显示项目的用户界面元素。列表框的外观和行为由其属性控制。引用特定的对象或属性。

示例 1：

Matlab

% MATLAB Code
function dataselectionbox
fig = uifigure('Position',[200 200 650 475]);
 
% Making a Numeric Edit Field
ef = uieditfield(fig,'numeric',...
    'Position',[250 180 200 44]);
 
% Making a List Box
lbox = uilistbox(fig,...
    'Items', {'GFG1', 'GFG2', 'GFG3', 'GFG3'},...
    'ItemsData', [0, 25, 40, 100],...
    'Position',[250 240 200 156],...
    'ValueChangedFcn');
 
% Callback to a function that has had its value changed
function selectionChanged(src,event)
    % In the edit field, show the data from the list box.
    ef.Value = src.Value;
end
 
end

输出：

从带有数据选择的列表中选择一个项目。与选择关联的温度在数字编辑框中更新。

现在我们在 MATLAB 中看到了基于 ListBox GUI 的应用程序。为此，我们在 MATLAB 中选择 Design App 选项和 ListBox 选项。

示例 2：

MATLAB

% MATLAB code for ListBox GUI
classdef appList < matlab.apps.AppBase
 
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                matlab.ui.Figure
        ListBoxGUIdemoLabel     matlab.ui.control.Label
        EditField3              matlab.ui.control.NumericEditField
        ResultLabel             matlab.ui.control.Label
        EnterSecondNumberLabel  matlab.ui.control.Label
        EnterFirstNumberLabel   matlab.ui.control.Label
        EditField2              matlab.ui.control.EditField
        EditField               matlab.ui.control.EditField
        ListListBox             matlab.ui.control.ListBox
        ListListBoxLabel        matlab.ui.control.Label
    end
 
    % Callbacks that handle component events
    methods (Access = private)
 
        % Callback function
        function CSESubjectListBoxValueChanged(app, event)
 
        end
 
        % Value changed function: ListListBox
        function List1.ListBoxValueChanged(app, event)
            value = app.List1.ListBox.Value;
             value = get(handles.ListBox,'value');
            A Label = get(handles.edit1.'String');
            B label = get(handles.edit1.'String');
            A Label = Str2num(A);
            B Label = Str2num(B);
        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 = 'MATLAB App';
 
            % Create ListListBoxLabel
            app.ListListBoxLabel = uilabel(app.UIFigure);
            app.ListListBoxLabel.HorizontalAlignment = 'right';
            app.ListListBoxLabel.Position = [73 178 48 22];
            app.ListListBoxLabel.Text = 'List ';
 
            % Create ListListBox
            app.ListListBox = uilistbox(app.UIFigure);
            app.ListListBox.Items = {'Add', 'Sub', 'Multiply', 'Division'};
            app.ListListBox.ValueChangedFcn = createCallbackFcn(app,
            @ListListBoxValueChanged, true);
            app.ListListBox.Position = [186 63 284 149];
            app.ListListBox.Value = 'Add';
 
            % Create EditField
            app.EditField = uieditfield(app.UIFigure, 'text');
            app.EditField.Position = [307 356 163 45];
 
            % Create EditField2
            app.EditField2 = uieditfield(app.UIFigure, 'text');
            app.EditField2.Position = [307 303 163 44];
 
            % Create EnterFirstNumberLabel
            app.EnterFirstNumberLabel = uilabel(app.UIFigure);
            app.EnterFirstNumberLabel.Position = [73 356 156 45];
            app.EnterFirstNumberLabel.Text = 'Enter First Number';
 
            % Create EnterSecondNumberLabel
            app.EnterSecondNumberLabel = uilabel(app.UIFigure);
            app.EnterSecondNumberLabel.Position = [71 303 132 44];
            app.EnterSecondNumberLabel.Text = 'Enter Second Number';
 
            % Create ResultLabel
            app.ResultLabel = uilabel(app.UIFigure);
            app.ResultLabel.Position = [73 242 178 36];
            app.ResultLabel.Text = 'Result';
 
            % Create EditField3
            app.EditField3 = uieditfield(app.UIFigure, 'numeric');
            app.EditField3.Position = [307 231 163 43];
 
            % Create ListBoxGUIdemoLabel
            app.ListBoxGUIdemoLabel = uilabel(app.UIFigure);
            app.ListBoxGUIdemoLabel.BackgroundColor = [0.3922 0.8314 0.0745];
            app.ListBoxGUIdemoLabel.FontWeight = 'bold';
            app.ListBoxGUIdemoLabel.Position = [71 426 420 33];
            app.ListBoxGUIdemoLabel.Text = 'List Box GUI demo';
 
            % 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 = appList
 
            % 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

输出：