Tree

Selected nodes, specified as a TreeNode object or an array of TreeNode objects. Use this property to get or set the selected nodes in a tree.

To allow users to select multiple nodes, set the Multiselect property to 'on'. MATLAB^® always returns SelectedNodes as a column vector when the tree has multiple selected nodes.

Font name, specified as a system supported font name. The default font depends on the specific operating system and locale.

If the specified font is not available, then MATLAB uses the best match among the fonts available on the system where the app is running.

Example: 'Arial'

Font size, specified as a positive number. The units of measurement are pixels. The default font size depends on the specific operating system and locale.

Example: 14

Font weight, specified as one of these values:

Not all fonts have a bold font weight. For fonts that do not, specifying 'bold' results in the normal font weight.

Font angle, specified as 'normal' or 'italic'. Not all fonts have an italic font angle. For fonts that do not, specifying 'italic' results in the normal font angle.

Font color, specified as an RGB triplet, a hexadecimal color code, or one of the options listed in the table.

RGB triplets and hexadecimal color codes are useful for specifying custom colors.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.

Background color, specified as an RGB triplet, a hexadecimal color code, or one of the color options listed in the table.

RGB triplets and hexadecimal color codes are useful for specifying custom colors.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.

This property is read-only.

Configuration of added styles created using the uistyle function, returned as an n-by-3 table array. Each row of the table array corresponds to a style that is currently applied to the tree. Styles that are added consecutively are given a style order number of n+1. The Target and TargetIndex columns specify the part of the tree that the style was added to. The Style column specifies the style class name.

Use this property if you want to remove a style from the tree using the removeStyle function.

Example: Remove a Style

First, add two styles to a tree.

fig = uifigure;
fig.Position = [100 100 250 350];
t = uitree(fig);
n1 = uitreenode(t,'Text','Fruits');
n11 = uitreenode(n1,'Text','Banana');
n12 = uitreenode(n1,'Text','Cherry');
n2 = uitreenode(t,'Text','Vegetables');
n21 = uitreenode(n2,'Text','Broccoli');
n22 = uitreenode(n2,'Text','Lettuce');
expand(t)

s1 = uistyle('FontColor',[0 0.4 0.7]);    % Blue
s2 = uistyle('FontColor',[0.1 0.5 0.1]);  % Green

addStyle(t,s1,'level',2);
addStyle(t,s2,'node',[n2 n21 n22]);

When you query t.StyleConfigurations, MATLAB returns a 2-by-3 table array. The level style was added to the tree first, so it is style order number 1. The TargetIndex value for the level style, {[ 2]}, indicates that the style was applied to the second level of nodes. Similarly, the second style was added to three nodes in the tree.

t.StyleConfigurations

ans =

  2×3 table

         Target     TargetIndex                Style          
         ______    ______________    _________________________

    1    level     {[         2]}    1×1 matlab.ui.style.Style
    2    node      {1×3 TreeNode}    1×1 matlab.ui.style.Style

Remove the second style that was added to the tree by specifying style order number 2. The tree component appearance updates to use only the first style.

removeStyle(t,2)

State of visibility, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

To make your app start faster, set the Visible property to 'off' for all UI components that do not need to appear at startup.

Multiple node selection, specified as 'off' or 'on', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

Set this property to 'on' to allow users to select multiple nodes simultaneously.

Node text editability, specified as 'off' or 'on', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

Set this property to 'on' to allow the user to edit the node text at run time. The Enable property must also be set to 'on' to make the text editable.

Operational state of tree, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

Set this property to 'off' to make the tree and its nodes appear dim, indicating that the user cannot interact with the tree or its nodes.

Tooltip, specified as a character vector, cell array of character vectors, string array, or 1-D categorical array. Use this property to display a message when the user hovers the pointer over the component at run time. The tooltip displays even when the component is disabled. To display multiple lines of text, specify a cell array of character vectors or a string array. Each element in the array becomes a separate line of text. If you specify this property as a categorical array, MATLAB uses the values in the array, not the full set of categories.

Context menu, specified as a ContextMenu object created using the uicontextmenu function. Use this property to display a context menu when you right-click on a component.

Location and size, specified as a four-element vector of the form [left bottom width height]. This table describes each element in the vector. All measurements are in pixel units.

Location and size, specified as a four-element vector of the form, [left bottom width height]. The values in the vector are relative to the parent container. All measurements are in pixel units. This property value is identical to the Position property.

This property is read-only.

Location and size, returned as a four-element vector of the form, [left bottom width height]. The values in the vector are relative to the parent container. All measurements are in pixel units. This property value is identical to the Position property.

Layout options, specified as a GridLayoutOptions object. This property specifies options for components that are children of grid layout containers. If the component is not a child of a grid layout container (for example, it is a child of a figure or panel), then this property is empty and has no effect. However, if the component is a child of a grid layout container, you can place the component in the desired row and column of the grid by setting the Row and Column properties on the GridLayoutOptions object.

For example, this code places a tree in the third row and second column of its parent grid.

g = uigridlayout([4 3]);
t = uitree(g);
t.Layout.Row = 3;
t.Layout.Column = 2;

To make the tree span multiple rows or columns, specify the Row or Column property as a two-element vector. For example, this tree spans columns 2 through 3:

t.Layout.Column = [2 3];

Selection changed callback, specified as one of these values:

Use this callback function to execute commands when the user selects a different node in the tree.

This callback function can access specific information about the user’s interaction with the tree, such as the selected nodes. MATLAB passes this information in a SelectedNodesChangedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.SelectedNodes returns the selected TreeNode object or objects. The SelectedNodesChangedData object is not available to callback functions specified as character vectors.

The following table describes properties of the SelectedNodesChangedData object.

For more information about writing callbacks, see Callbacks in App Designer.

Node expanded callback, specified as one of these values:

Use this callback function to execute commands when the user expands a node in the tree.

This callback function can access specific information about the user’s interaction with the node. MATLAB passes this information in a NodeExpandedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.Node returns the TreeNode object that the user collapsed. The NodeExpandedData object is not available to callback functions specified as character vectors.

The following table describes properties of the NodeExpandedData object.

For more information about writing callbacks, see Callbacks in App Designer.

Node collapsed callback, specified as one of these values:

Use this callback function to execute commands when the user collapses a node in the tree.

This callback function can access specific information about the user’s interaction with the node. MATLAB passes this information in a NodeCollapsedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.Node returns the TreeNode object that the user collapsed. The NodeCollapsedData object is not available to callback functions specified as character vectors.

The following table describes properties of the NodeCollapsedData object.

For more information about writing callbacks, see Callbacks in App Designer.

Node text changed callback, specified as one of these values:

Use this callback function to execute commands when the user changes the text for a node in the tree.

This callback function can access specific information about the user’s interaction with the tree node. MATLAB passes this information in a NodeTextChangedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.PreviousText returns the previous node text. The NodeTextChangedData object is not available to callback functions specified as character vectors.

The following table describes the properties of the NodeTextChangedData object.

For more information about writing callbacks, see Callbacks in App Designer.

Clicked callback, specified as one of these values:

This callback function executes when the user clicks anywhere in the tree.

This callback function can access specific information about the user’s interaction with the tree UI component. MATLAB passes this information in a ClickedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.InteractionInformation returns information about where the user clicked in the tree. The ClickedData object is not available to callback functions specified as character vectors.

This table lists the properties of the ClickedData object.

This table lists the properties of the InteractionInformation object associated with the tree UI component.

For more information about writing callbacks, see Callbacks in App Designer.

Example: Open Dialog Box When Tree Is Clicked

Create a tree with some tree nodes. Specify a ClickedFcn callback function named chooseIcon that executes when a user clicks the tree. In the chooseIcon function:

To try this example, save the code in a new script and run it. Click a node in the tree and select an icon image file.

fig = uifigure;
t = uitree(fig);
n1 = uitreenode(t);
n2 = uitreenode(t);
n11 = uitreenode(n1);
n21 = uitreenode(n2);
t.ClickedFcn = @chooseIcon;
expand(t)

function chooseIcon(src,event)
node = event.InteractionInformation.Node;
if ~isempty(node)
    [file,path] = uigetfile("*.png");
    if ~isequal(file,0)
        node.Icon = fullfile(path,file);
    end
    focus(src)
end
end

Double-clicked callback, specified as one of these values:

This callback function executes when the user double-clicks anywhere in the tree.

This callback function can access specific information about the user’s interaction with the tree UI component. MATLAB passes this information in a DoubleClickedData object as the second argument to your callback function. In App Designer, the argument is called event. You can query the object properties using dot notation. For example, event.InteractionInformation returns information about where the user double-clicked in the tree. The DoubleClickedData object is not available to callback functions specified as character vectors.

This table lists the properties of the DoubleClickedData object.

This table lists the properties of the InteractionInformation object associated with the tree UI component.

For more information about writing callbacks, see Callbacks in App Designer.

Example: Open Dialog Box When Tree is Double-Clicked

Create a tree with some tree nodes. Specify a DoubleClickedFcn callback function named chooseIcon that executes when a user double-clicks the tree. In the chooseIcon function:

To try this example, save the code in a new script and run it. Double-click a node in the tree and select an icon image file.

fig = uifigure;
t = uitree(fig);
n1 = uitreenode(t);
n2 = uitreenode(t);
n11 = uitreenode(n1);
n21 = uitreenode(n2);
t.DoubleClickedFcn = @chooseIcon;
expand(t)

function chooseIcon(src,event)
node = event.InteractionInformation.Node;
if ~isempty(node)
    [file,path] = uigetfile("*.png");
    if ~isequal(file,0)
        node.Icon = fullfile(path,file);
    end
    focus(src)
end
end

Object creation function, specified as one of these values:

For more information about specifying a callback as a function handle, cell array, or character vector, see Callbacks in App Designer.

This property specifies a callback function to execute when MATLAB creates the object. MATLAB initializes all property values before executing the CreateFcn callback. If you do not specify the CreateFcn property, then MATLAB executes a default creation function.

Setting the CreateFcn property on an existing component has no effect.

If you specify this property as a function handle or cell array, you can access the object that is being created using the first argument of the callback function. Otherwise, use the gcbo function to access the object.

Object deletion function, specified as one of these values:

For more information about specifying a callback as a function handle, cell array, or character vector, see Callbacks in App Designer.

This property specifies a callback function to execute when MATLAB deletes the object. MATLAB executes the DeleteFcn callback before destroying the properties of the object. If you do not specify the DeleteFcn property, then MATLAB executes a default deletion function.

If you specify this property as a function handle or cell array, you can access the object that is being deleted using the first argument of the callback function. Otherwise, use the gcbo function to access the object.

Callback interruption, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

This property determines if a running callback can be interrupted. There are two callback states to consider:

MATLAB determines callback interruption behavior whenever it executes a command that processes the callback queue. These commands include drawnow, figure, uifigure, getframe, waitfor, and pause.

If the running callback does not contain one of these commands, then no interruption occurs. MATLAB first finishes executing the running callback, and later executes the interrupting callback.

If the running callback does contain one of these commands, then the Interruptible property of the object that owns the running callback determines if the interruption occurs:

Callback queuing, specified as 'queue' or 'cancel'. The BusyAction property determines how MATLAB handles the execution of interrupting callbacks. There are two callback states to consider:

The BusyAction property determines callback queuing behavior only when both of these conditions are met:

Under these conditions, the BusyAction property of the object that owns the interrupting callback determines how MATLAB handles the interrupting callback. These are possible values of the BusyAction property:

This property is read-only.

Deletion status, returned as an on/off logical value of type matlab.lang.OnOffSwitchState.

MATLAB sets the BeingDeleted property to 'on' when the DeleteFcn callback begins execution. The BeingDeleted property remains set to 'on' until the component object no longer exists.

Check the value of the BeingDeleted property to verify that the object is not about to be deleted before querying or modifying it.

Parent container, specified as a Figure object created using the uifigure function, or one of its child containers: Tab, Panel, ButtonGroup, or GridLayout. If no container is specified, MATLAB calls the uifigure function to create a new Figure object that serves as the parent container.

Children, returned as an array of TreeNode objects.

You cannot add or remove children using the Children property, but you can use the property to view the list of children. The order of the children reflects the order of the child nodes displayed on the screen. To add a child to this list, set the Parent property of the child component to be the Tree object.

To reorder the children, use the move function.

Objects with the HandleVisibility property set to 'off' are not listed in the Children property.

Visibility of the object handle, specified as 'on', 'callback', or 'off'.

This property controls the visibility of the object in its parent's list of children. When an object is not visible in its parent's list of children, it is not returned by functions that obtain objects by searching the object hierarchy or querying properties. These functions include get, findobj, clf, and close. Objects are valid even if they are not visible. If you can access an object, you can set and get its properties, and pass it to any function that operates on objects.

This property is read-only.

Type of graphics object, returned as 'uitree'.

Object identifier, specified as a character vector or string scalar. You can specify a unique Tag value to serve as an identifier for an object. When you need access to the object elsewhere in your code, you can use the findobj function to search for the object based on the Tag value.

User data, specified as any MATLAB array. For example, you can specify a scalar, vector, matrix, cell array, character array, table, or structure. Use this property to store arbitrary data on an object.

If you are working in App Designer, create public or private properties in the app to share data instead of using the UserData property. For more information, see Share Data Within App Designer Apps.