Is there any way to find out which specific instance of a UIContextMenu is being called?

Question

Bryant Lash 2021-9-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1464254-is-there-any-way-to-find-out-which-specific-instance-of-a-uicontextmenu-is-being-called

回答： Samay Sagar 2024-2-22

So here's my basic setup:

A UIFigure with a UITree, containing multiple UITreeNodes. I want to be able to right click on one of the UITreeNodes, which will do an operation specifically on that node. Let's say I just want to display the text present in the node from which I right clicked.

For example, consider this setup:

figHandle = uifigure;
ctxMenu = uicontextmenu(figHandle);
menuOpt = uimenu(ctxMenu,'text','printNodeText','Callback',@doSomethingCallback);
baseTree = uitree(figHandle);
node1 = uitreenode(baseTree,'text','node1text','ContextMenu',ctxMenu);
node2 = uitreenode(baseTree,'text','node2text','ContextMenu',ctxMenu);
function doSomethingCallback(src,ev)
%for example, display right-clicked UITReeNode's text, either "node1text" or "node2text"
end

When I right click node1 and click printNodeText from there, I want "node1text" displayed. When I right click node2 and click printNodeText from there, I want "node2text" diplayed.

Solutions that I'm pretty sure don't work:

Get the current object - passing figHandle to the callback and then accessing figHandle.CurrentObject will get me just to baseTree, not to node1.

get the current object then selected uitreenode - So close! Except it doesn't work because the node I right clicked isn't necessarily the same as the current seelcted node, given a right click doesn't change the selected node. If I just opened my figure and right clicked on node1,

baseTree = figHandle.CurrentObject;
selectedNodes = baseTree.SelectedNodes;
disp(selectedNodes.Text);

selectedNodes would be empty, meaning that disp() command would fail, rather than displaying "node1text"

Utilizing ContextMenuOpeningFcn - Unfortunately this doesn't seem to have any path to the node I selected, again just to the figure and UITree

Creating individual context menus - not that this doesn't work per say, but it clutters like nobody's business, given how many nodes I have. The top level figure would end up insanely cluttered with all those contextMenus anchored to it. I'd love to avoid this.

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Answer 1

Samay Sagar 2024-2-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1464254-is-there-any-way-to-find-out-which-specific-instance-of-a-uicontextmenu-is-being-called#answer_1414253

在 MATLAB Online 中打开

Starting from MATLAB R2021b, you can access the node for which the context menu is opened using the “CurrentObject” property. Here’s a simple example of how you can achieve this:

figHandle = uifigure; 
ctxMenu = uicontextmenu(figHandle); 
menuOpt = uimenu(ctxMenu, 'Text', 'Print Node Text', 'MenuSelectedFcn', @doSomethingCallback); 
baseTree = uitree(figHandle, 'Position', [20 20 150 150]); 
node1 = uitreenode(baseTree, 'Text', 'node1text'); 
node1.ContextMenu = ctxMenu; 
node1.NodeData = node1;   
node2 = uitreenode(baseTree, 'Text', 'node2text'); 
node2.ContextMenu = ctxMenu; 
node2.NodeData = node2;  
function doSomethingCallback(src, ~) 
    ctxMenuHandle = src.Parent; 
    figHandle = ctxMenuHandle.Parent; 
    treeNode = figHandle.CurrentObject; 
    disp(treeNode.Text);
end 