扩展 MATLAB uicontrol

Question

我想自定义一些 MATLAB uicontrols（例如下拉框），以赋予它们更多用户友好的功能。

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？

我已尝试使用此基本代码进行设置，但收到以下错误：

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形时发生错误：

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

---

编辑：经过考虑，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

1. 没有记录的方式（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，我们甚至无法获取 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
   

2. 对此的一种解决方案是编写一个子类handle 或
   hgsetget 的类，并将 uicontrol 对象的句柄保留为私有属性。 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uicontrol 句柄一样使用ComboBox：

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

3. 存在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/