擴展MATLAB uicontrol

Question

我想定製一些MATLAB的uicontrols（如下拉框），給他們更多的用戶友好的功能。

我的問題是：是否可以擴展/繼承uicontrol？如果是這樣，你怎麼做？如果沒有，是否有解決方法？

我曾嘗試這種基本的代碼只是爲了得到它的設置，但我收到以下錯誤：

：

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 

當我嘗試將其添加到一個數字出現的錯誤

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

---

編輯：考慮這件事之後，我認爲這將是一個不錯的解決辦法，豪如果可能的話，我仍然想知道如何擴展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. 沒有記錄的方式（如R2013a的）寫子類，以MATLAB句柄圖形 類。事實上，由於MATLAB存儲hg對象的方式，我們甚至不能輕易獲得hg對象的類。例如：

   >> fig = figure(); 
   >> class(f) 
   
   ans = 
   
   double 
   
   >> isa(f, 'figure') 
   
   ans = 
   
       0 
   
   >> ishghandle(f) 
   
   ans = 
   
       1 
   

2. 一種解決方法是寫哪個子類或者handle，或
   hgsetget一個類，並且保持的句柄uicontrol對象作爲私有財產。 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 
   

   然後，您可以使用ComboBox，就像任何其他uicontrol手柄：

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

3. 有延伸的把手圖形類， 無證方式，但我不熟悉它們。查看該參考文獻： http://undocumentedmatlab.com/blog/introduction-to-udd/