Creating a pushbutton and callback function

147 次查看（过去 30 天）
K VdB
K VdB 2016-10-24
评论： Walter Roberson 2021-11-26
I could not find the right answer after a long search.
I want to create several pushbuttons in the script:
PushButton = uicontrol(gcf,'Style', 'push', 'String', 'Next', ... 'Position', [300 10 30 30], ...
'CallBack', 'PushB');
Then when I push the pushbutton I want the program to run a related function
function PushB_Callback('variables')
display('I pushed the pushbutton')
end
How do I do this?
thanks

请先登录，再回答此问题。

采纳的回答

Mischa Kim
Mischa Kim 2016-10-24
编辑：Mischa Kim 2016-10-24
Try
function myButtonTest()
PushButton = uicontrol(gcf,'Style', 'push', 'String', 'Next','Position', [300 10 30 30],'CallBack', @PushB);
function PushB(source,event)
display('I pushed the pushbutton')
end
end
For more information, check out the example in the documentation.
  7 个评论
显示 5更早的评论
Mischa Kim
Mischa Kim 2016-10-24
@Simon: Absolutely. I just copy-pasted the code without replacing the quotation marks. Thanks.

请先登录，再进行评论。

更多回答（1 个）

Jan
Jan 2016-10-24
编辑：Jan 2016-10-26
Use a function handle:
function main()
PushButton = uicontrol(gcf,'Style', 'push', 'String', 'Next', ...
'Position', [300 10 30 30], ...
'CallBack', @PushB_Callback); % [EDITED, Typo: "_Callback" added]
end
function PushB_Callback(ObjectH, EventData)
display('I pushed the pushbutton')
end
  4 个评论
显示 2更早的评论
Walter Roberson
Walter Roberson 2021-11-26
@Brian Njenga
In MATLAB, callback functions are automatically passed at least two parameters.
The first parameter is the handle of the object for which the callback is taking place. This allows you to use the same callback function for different objects, with the function using the passed-in handle to know which object it was invoked for. So in the case of this sample code, the first parameter, here called ObjectH, will be passed as the handle of the uicontrol -- it will have the same value as PushButton has.
The second parameter is event information that describes in more detail what was requested. For most kinds of callbacks, there is no additional information and [] is passed. For some kinds of callbacks such as WindowsButtonPressFcn the parameter is a struct that has information about which button (or key) was pressed, or what the current bounds are (for constraint callbacks), and so on.
For uicontrol associated with "traditional" figures, when using Callback, then the event data will be a object of type ActionData, that has a property Source (which will be a handle to the control that was activated), and property EventName, which will be the character vector with content 'Action'

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Migrate GUIDE Apps 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by