如何用MATLAB实现拖拽控件

一般来说，MATLAB自身的GUI是不能够实现将文件夹或者文字拖拽进去进行读取的，就像用QQ邮箱上传文件一样：

然后我们用MATLAB实现的效果如下：

这个控件并不是用过MATLAB自带的函数实现的，而是通过调用Java来实现，先要定义好Java的对象，然后在MATLAB程序中进行调用，使用起来我们并不需要知道其中的原理，只需要当做黑匣子就可以了。

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一定不要嫌麻烦，我会给出文件夹下载可以直接使用，你调整一下代码弄成自己的就好了，下面这个文件保存为dndcontrol.m

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classdef (CaseInsensitiveProperties) dndcontrol < handle
%DNDCONTROL Class for Drag & Drop functionality.
%   obj = DNDCONTROL(javaobj) creates a dndcontrol object for the specified
%   Java object, such as 'javax.swing.JTextArea' or 'javax.swing.JList'. Two
%   callback functions are available: obj.DropFileFcn and obj.DropStringFcn, 
%   that listen to drop actions of respectively system files or plain text.
%
%   The Drag & Drop control class relies on a Java class that need to be
%   visible on the Java classpath. To initialize, call the static method
%   dndcontrol.initJava(). The Java class can be adjusted and recompiled if
%   desired.
%
%   DNDCONTROL Properties:
%       Parent            - The associated Java object.
%       DropFileFcn       - Callback function for system files.
%       DropStringFcn     - Callback function for plain text.
%
%   DNDCONTROL Methods:
%       dndcontrol        - Constructs the DNDCONTROL object.
%
%   DNDCONTROL Static Methods:
%       defaultDropFcn    - Default callback function for drop events.
%       demo              - Runs the demonstration script.
%       initJava          - Initializes the Java class.
%       isInitialized     - Checks if the Java class is visible.
%
%   A demonstration is available from the static method dndcontrol.demo().
%
%   Example:
%       dndcontrol.initJava();
%       dndcontrol.demo();
%
%   See also:
%       uicontrol, javaObjectEDT.    
%
%   Written by: Maarten van der Seijs, 2015.
%   Version: 1.0, 13 October 2015.

    properties (Hidden)
        dropTarget;                
    end
    
    properties (Dependent)
        %PARENT The associated Java object.
        Parent;
    end
    properties
        %DROPFILEFCN Callback function executed upon dropping of system files.
        DropFileFcn;        
        %DROPSTRINGFCN Callback function executed upon dropping of plain text.
        DropStringFcn;        
    end
    
    methods (Static)
        function initJava()
        %INITJAVA Initializes the required Java class.
        
            %Add java folder to javaclasspath if necessary
            if ~dndcontrol.isInitialized();
                classpath = fileparts(mfilename('fullpath'));                
                javaclassp