What software functionality requires triggering callback functions by adding or removing dynamic attributes?
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In MATLAB, it appears that only 'dynamic properties' can trigger built-in events(PropertyAdded/PropertyRemoved) when added or removed. For example, in the following code snippet. But from a product design perspective, the necessity of using the addition/removal of 'dynamic properties' to trigger callback functions for changing text in a figure is not very significant.
So, in which software requirements is it necessary to use the addition/removal of dynamic properties to trigger callback functions?"
%main.m
function main()
clear all
clc
import MyFigure.* %Import packge
%Creat a figure object fig_obj
fig_obj=MyFigure([0.2,0.2,0.50,0.50]);
%Creat class AddDynoProFigHandlea;=AddDynoProp(fig_obj);
%pause; %暂停
%Add 'dynamic properties'Data for fig_obj through object ab
ab.AddPropForMyFigure(fig_obj,'Data');
%Use findprop to obtain the meta.DynamicProperty object corresponding to the member 'Data'
m = fig_obj.findprop('Data');
%将函数set_Data的句柄指派到SetMethod成员上
m.SetMethod = @set_Data;
%成员Data的数据设置
fig_obj.Data=peaks;
delete(ab);
end
MyFigure.m
%+MyFigure\@MyFigure\MyFigure.m
classdef MyFigure<dynamicprops
properties
FigHandle; %图形窗口句柄
AxHandle; %轴对象句柄
end
methods
function obj = MyFigure (pos) %构造函数
if nargin > 0
if length(pos) == 4
obj.FigHandle = figure('Unit','normalized','Position',pos,...
'Name','动态属性成员事件演示','NumberTitle','off',...
'MenuBar','none');
else
error('Improper position')
end
end
obj.AxHandle =axes('Parent',obj.FigHandle,...
'Unit','normalized',...
'Pos',[0.1,0.1,0.7,0.8]);
uicontrol('Parent',obj.FigHandle,...
'Unit','normalized',...
'Pos',[0.82,0.1,0.15,0.1],...
'Style','pushbutton',...
'String','退出',...
'Callback','close');
end
end
end
AddDynoProp.m
%+MyFigure\@AddDynoProp\AddDynoProp.m
classdef AddDynoProp < handle
properties
mp; %动态属性成员对应的meta.DynamicProperty对象
end
methods
%构造函数,evtobj为产生事件的对象
function obj = AddDynoProp(evtobj)
if nargin > 0
%创建两个听众
addlistener(evtobj,'PropertyAdded',@MyFigure.AddDynoProp.PropEvents);
addlistener(evtobj,'PropertyRemoved',@MyFigure.AddDynoProp.PropEvents);
end
end
%在对象evtobj上添加属性成员DynoPropName为产生事件的对象
function AddPropForMyFigure(obj,evtobj,DynoPropName)
obj.mp = evtobj.addprop(DynoPropName);
end
%析构函数
function delete(obj)
delete(obj.mp); %删除动态属性成员
end
end
methods (Static)
%回调函数
function PropEvents(src,evnt)
switch evnt.EventName
case 'PropertyAdded'
title(src.AxHandle,'PropertyAdded 事件发生了');
case 'PropertyRemoved'
title(src.AxHandle,'PropertyRemoved 事件发生了');
set(src.AxHandle,'Visible','off');
end
end
end
end
set_Data
function set_Data(obj,val)
obj.Data = val;
surf(obj.Data); %绘制Data的曲面图
end
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