在UITree Matlab中單擊節點時在面板中顯示列出的圖像？

Question

我正在Matlab中工作。當用戶點擊樹列表中的文件名時，我想要在給定的面板中逐個顯示圖像。誰能幫幫我嗎？

代碼樹：

src = strcat(pwd,'\Result\'); 
[mtree, container] = uitree('v0', 'Root',src,۔۔۔ 
'Position',[10 10 290 370],'Parent', imageListPanel2); % Parent is ignored 
set(container, 'Parent', imageListPanel2); % fix the uitree Parent 

函數來顯示在面板圖片：

function refreshDisplay(varargin) 
    imgDisplayed = imshow(tmp,'parent',workingAx); 
end %refreshDisplay 

我只需要知道如何從我的樹調用函數refreshDisplay（）。再次記住我想從樹元素（文件）中調用函數，而不是從節點（子目錄）中調用。

問候。

Answer 1

請注意，樹中的所有內容都是節點，文件夾和圖像。您需要在選擇回調中執行檢查以測試選定節點是否爲文件夾。

引用UndocumentedMatlab：

當前選擇的（多個）節點可使用mtree.getSelectedNodes被訪問。節點選擇 回調往往需要當前選擇的行的知識：

%// Tree set up 
mtree = uitree(..., 'SelectionChangeFcn',@mySelectFcn); 
set(mtree, 'SelectionChangeFcn',@mySelectFcn); % an alternative 

%// The tree-node selection callback 
function nodes = mySelectFcn(tree, value) 
    selectedNodes = tree.getSelectedNodes; 
    %// Use this to see which information is available about the node: 
    %// methods(selectedNodes(1),'-full') 
    %// And the node array: 
    %// methods(selectedNodes,'-full') 
    if ~isempty(selectedNodes) || max(selectedNodes.size)>1 
     %// Obtain path from selected node; Source: link1 below 
     nodePath = selectedNodes(1).getPath.cell; 
     subPathStrs = cellfun(@(p) [p.getName.char,filesep],nodePath,'un',0); 
     pathStr = strrep([subPathStrs{:}], [filesep,filesep],filesep); 
     %// Also, don't forget a drive letter here^if required 
     if ~isdir(pathStr) %// check that the selection isn't a directory 
      %// this is where you need to call your refresh function 
     end 
    end 
end %// mySelectFcn 

link1

---

你可以得到一些其他的想法在this answer，它展示瞭如何實現鼠標跟蹤回調，在如果您希望刷新在鼠標上執行...

Answer 2

下面是一個快速但完整的示例。代碼被註釋掉，易於遵循：

function MyImageViewer 
    % prepare GUI 
    hFig = figure('Menubar','none', 'Name','Image Viewer'); 
    hPan(1) = uipanel('Parent',hFig, 'Position',[0 0 0.3 1]); 
    hPan(2) = uipanel('Parent',hFig, 'Position',[0.3 0 0.7 1]); 

    ax = axes('Parent',hPan(2), 'Units','normalized', 'Position',[0 0 1 1]); 
    axis(ax, 'off', 'image') 

    [jtree,htree] = uitree('v0', 'Parent',hFig, ... 
     'Root','C:\Users\Amro\Pictures\', 'SelectionChangeFcn',@changeFcn); 
    set(htree, 'Parent',hPan(1), 'Units','normalized', 'Position',[0 0 1 1]); 
    jtree.expand(jtree.getRoot); % expand root node 

    % list of supported image extensions 
    fmt = imformats; 
    imgExt = lower([fmt.ext]); 

    function changeFcn(~,~) 
     % get selected node 
     nodes = jtree.getSelectedNodes; 
     if isempty(nodes), return; end 
     n = nodes(1); 

     % only consider a leaf node (skip folders) 
     if ~n.isLeaf, return; end 

     % get complete node path (absolute filename) 
     p = arrayfun(@(nd) char(nd.getName), n.getPath, 'Uniform',false); 
     p = strjoin(p(:).', filesep); 

     % check for supported image types, and show image 
     [~,~,ext] = fileparts(p); 
     if any(strcmpi(ext(2:end),imgExt)) 
      imshow(p, 'Parent',ax) 
     end 
    end 
end