Question

我想定制一些MATLAB uicontrols（例如下拉框），以便为他们提供更加用户友好的功能。

我的问题是：是否可以扩展/继承uicontrol？如果是这样，你怎么做？如果没有，是否有解决方法？

我尝试过这个基本代码只是为了设置它，但是我收到以下错误：

The specified super-class 'uicontrol' contains a parse error or cannot be found on MATLAB's search path, possibly shadowed by another file with the same name.

classdef ComboBox < uicontrol    
    methods(Access = public)
        function obj = ComboBox()
            set(obj, 'Style', 'popup');
        end 
    end
end

当我尝试将其添加到图中时发生错误：

cmb = ComboBox();
set(cmb, 'Parent', obj.ui_figure);

编辑：在考虑之后，我认为这将是一个不错的解决方法，但是，如果可能的话，我仍然想知道如何扩展uicontrol。

classdef ComboBox < uicontrol    
    properties(Access = public)
       Control;
    end

    methods(Access = public)
        function obj = ComboBox(parent, items)
            obj.Control = uicontrol();
            set(obj.Control, 'Style', 'popup');
            set(obj.Control, 'Parent', parent);
            set(obj.Control, 'String', items);
        end 
    end
end

Answer 1

没有记录方法（从R2013a开始）将子类写入MATLAB Handle Graphics 类。事实上，由于MATLAB存储hg对象的方式，我们甚至无法得到一个hg对象的类很容易。例如：
```
>> fig = figure();
>> class(f)

ans =

double

>> isa(f, 'figure')

ans =

     0

>> ishghandle(f)

ans =

     1
```

对此的一个解决方案是编写一个子类handle或
的子类 hgsetget，并将uicontrol对象的句柄保存为私有属性。例如：

classdef ComboBox < hgsetget
    properties (Access = private)
        Control
    end

    properties
        % extend the functionality of your new uicontrol with additional
        % properties
        newProp1
        newProp2
    end

    properties (Dependent = true)
        % make any properties of uicontrol for which you want to still
        % allow access as dependent properties. define set and get methods
        % for these properties below
        fontSize
        foregroundColor
        backgroundColor
        items
    end

    methods
        function obj = ComboBox(parent, items)
            obj.Control = uicontrol(parent, 'Style', 'popup', ...
                'String', items);
            % make sure to delete this object if you delete the uicontrol
            set(obj.Control, 'DeleteFcn', {@(source, eventData)delete(obj)})
        end

        % Define set and get methods for your new properties. These methods
        % will set the actual properties, and then modify the uicontrol in
        % some way
        function prop = get.newProp1(obj)
            prop = obj.newProp1;
        end

        function set.newProp1(obj, newVal)
            obj.newProp1 = newVal;
            % do something else
        end

        function prop = get.newProp2(obj)
            prop = obj.newProp2;
        end

        function set.newProp2(obj, newVal)
            obj.newProp2 = newVal;
            % do something else
        end

        % Define set and get methods for any uicontrol properties you wish
        % to retain. These methods will simply redirect calls to the
        % uicontrol object.
        function size = get.fontSize(obj)
            size = get(obj.Control, 'FontSize');
        end

        function set.fontSize(obj, newSize)
            set(obj.Control, 'FontSize', newSize);
        end

        function color = get.backgroundColor(obj)
            color = get(obj.Control, 'BackgroundColor');
        end

        function set.backgroundColor(obj, newColor)
            set(obj.Control, 'BackgroundColor', newColor);
        end

        function color = get.foregroundColor(obj)
            color = get(obj.Control, 'ForegroundColor');
        end

        function set.foregroundColor(obj, newColor)
            set(obj.Control, 'ForegroundColor', newColor);
        end

        % You can even rename some uicontrol properties to fit your
        % purpose.
        function items = get.items(obj)
            items = get(obj.Control, 'String');
        end

        function set.items(obj, newItems)
            set(obj.Control, 'String', newItems);
        end

    end
end

然后，您可以像使用任何其他ComboBox句柄一样使用uicontrol：

obj = ComboBox(figure, 'hello|goodbye');
set(obj, 'items', 'newItem1|newItem2');

有扩展句柄图形类的未记录方法，但我不熟悉他们。看看这个参考： http://undocumentedmatlab.com/blog/introduction-to-udd/

扩展MATLAB uicontrol

1 个答案: