扩展MATLAB控件

Question

我想自定义一些MATLAB uiconcontrols(如下拉框)，以使它们具有更多用户友好的功能。

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

我已经尝试了这个基本的代码，只是为了得到它的设置，但我收到以下错误:

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

当我尝试将它添加到一个数字时发生错误:

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

---

编辑:经过思考，我认为这将是一个体面的解决方案，然而，我仍然想知道如何扩展uicontrol，如果它是可能的。

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(如R2013a)编写MATLAB处理图形的子类类。事实上，由于MATLAB存储hg对象的方式，我们甚至无法获得一个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
   

2. 解决这个问题的一个方法是编写一个类，它可以继承handle或
   hgsetget，并将uicontrol对象的句柄作为私有属性。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
   

   你可以像使用其他uicontrol句柄一样使用ComboBox:

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

3. 有未记录的扩展句柄图形类的方法，但我对它们不熟悉。看看这个参考:http://undocumentedmatlab.com/blog/introduction-to-udd/