Hittest axes with WindowWheelScrollFcn callback

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Bjarke Skogstad Larsen 2018-6-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/408036-hittest-axes-with-windowwheelscrollfcn-callback

评论： Bjarke Skogstad Larsen 2018-6-29

I am attempting to make a GUI that has interaction using the mouse wheel, and the GUI behavior should depend on which element the mouse cursor is over when the mouse wheel is used. There are multiple axes objects, and I have previously (probably around 2012) used hittest to check which axes the mouse cursor was hovering over. However, this no longer works unless I first use mouse click on the axes.

It seems like an odd behavior imo. Is there any way to achieve what I want without having to click on the axes first?

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Bjarke Skogstad Larsen 2018-6-29

在 MATLAB Online 中打开

Example code:

 function pickHit2
    f = figure;
    ax = axes;
    p1 = patch(rand(1,3),rand(1,3),'r');
    p2 = patch(rand(1,3),rand(1,3),'b');
    set(f,'WindowScrollWheelFcn',@hitresult);
    function hitresult(obj,event)
        hObj = hittest(obj);
        switch hObj
            case f
                disp('Figure');
            case ax
                disp('Axes');
            case p1
                disp('Patch (Red)');
            case p2
                disp('Patch (Blue)');
        end
    end
 end

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Answer 1

Jan 2018-6-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/408036-hittest-axes-with-windowwheelscrollfcn-callback#answer_326816

Try overobj2 from http://undocumentedmatlab.com/blog/undocumented-mouse-pointer-functions

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Bjarke Skogstad Larsen 2018-6-29

在 MATLAB Online 中打开

Thank you for your answer. This does seem to work as I intended but only when the axes are direct children of the figure. Unfortunately, the GUI I'm designing uses panels to tab between views, so it won't work for it :-(

Example code to show the problem:

 function pickHit3
    f = figure;
    p = uipanel(f);
    ax1 = axes(p,'Position',[0.1 0.1 0.3 0.8]);
    ax2 = axes(p,'Position',[0.6 0.1 0.3 0.8]);
    set(f,'WindowScrollWheelFcn',@hitresult);
    function hitresult(obj,event)
        hObj = overobj('axes');
        if ~isempty(hObj)
            switch hObj
                case ax1
                    disp('Axes (Left)');
                case ax2
                    disp('Axes (Right)');
            end
        else
            disp('No Axes under cursor');
        end
    end
 end