WindowButtonMotionFcn cannot be changed in later time

Question

raym 2023-4-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1944409-windowbuttonmotionfcn-cannot-be-changed-in-later-time

回答： raym 2023-4-10

Hi, I am creating a figure and customize the pan-function:

function hFig = mouse_figure
...
hFig  = figure;
set(hFig,...
    'WindowButtonDownFcn'  , @pan_click,...
    'WindowButtonUpFcn'    , @pan_release,...
    'WindowButtonMotionFcn', @pan_motion);
...
end

Then in the caller workspace, I need to update the WindowButtonMotionFcn to a new function that incorporate more arguments and do more stuffs. However, after the figure was shown, I found that the WindowButtonMotionFcn was not called as expected. Instead, it is still calling the original pan_motion. Is there something wrong with the code?

function f = test
    f  = mouse_figure;
    % debug here, get that:
    %   WindowButtonDownFcn: @mouse_figure/pan_click
    % WindowButtonMotionFcn: @mouse_figure/pan_motion
    %     WindowButtonUpFcn: @mouse_figure/pan_release
    
plot([1,2],[3,4])
zoom yon
    % debug here, get that:
    %     WindowButtonDownFcn: {3x1 cell}
    %     WindowButtonMotionFcn: @mouse_figure/pan_motion
    %     WindowButtonUpFcn: {3x1 cell}
    
    % f.WindowButtonDownFcn
    % ans = 
    %     @localModeWindowButtonDownFcn                    
    %     [1x1 matlab.uitools.internal.uimode]
    %     @(obj,evd)localWindowButtonDownFcn(obj,evd,hMode)
     
    %  f.WindowButtonUpFcn
    % ans = 
    %     @localModeWindowButtonUpFcn         
    %     [1x1 matlab.uitools.internal.uimode]
    %     []
    
set(f,'WindowButtonMotionFcn', @(~,~) pan_motion_driftPatchTextObjs(f,panHor,panVer,aYTopTextPatchCollects,aXLeftTextPatchCollects));
    % debug here, get that:
    
        % WindowButtonDownFcn: {3x1 cell}
        % WindowButtonMotionFcn: [function_handle]
        % WindowButtonUpFcn: {3x1 cell}
        
        % f.WindowButtonDownFcn
        % ans = 
        %     @localModeWindowButtonDownFcn                    
        %     [1x1 matlab.uitools.internal.uimode]
        %     @(obj,evd)localWindowButtonDownFcn(obj,evd,hMode)
        
        % f.WindowButtonMotionFcn
        % ans = 
        %     @(~,~)pan_motion_driftPatchTextObjs(f,panHor,panVer,aYTopTextPatchCollects,aXLeftTextPatchCollects)
        
        %  f.WindowButtonUpFcn
        % ans = 
        %     @localModeWindowButtonUpFcn         
        %     [1x1 matlab.uitools.internal.uimode]
        %     []
end
% after exit to base workspace:
a = ans;
a
        % WindowButtonDownFcn: {3x1 cell}
        % WindowButtonMotionFcn: @mouse_figure/pan_motion
        % WindowButtonUpFcn: {3x1 cell}
        
        % a.WindowButtonDownFcn
        % ans = 
        %     @localModeWindowButtonDownFcn                  
        %     [1x1 matlab.uitools.internal.uimode]
        %     @(obj,evd)locWindowButtonDownFcn(obj,evd,hMode)
         
        % a.WindowButtonMotionFcn
        % ans = 
        %     @mouse_figure/pan_motion
         
        % a.WindowButtonUpFcn
        % ans = 
        %     @localModeWindowButtonUpFcn         
        %     [1x1 matlab.uitools.internal.uimode]
        %     []