Tree
Tree UI component
Description
A tree UI component displays a list of items in a hierarchy within an app. Use
the Tree
object to modify the appearance and behavior of a tree after you
create it.
Creation
Create a tree in an app using the uitree
function.
Properties
Nodes
SelectedNodes
— Selected nodes
[]
(default) | TreeNode
object | array of TreeNode
objects
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 and Color
FontName
— Font name
system supported font name
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'
FontSize
— Font size
positive number
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
FontWeight
— Font weight
'normal'
(default) | 'bold'
Font weight, specified as one of these values:
'normal'
— Default weight as defined by the particular font'bold'
— Thicker character outlines than'normal'
Not all fonts have a bold font weight. For fonts that do not, specifying
'bold'
results in the normal font weight.
FontAngle
— Font angle
'normal'
(default) | 'italic'
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.
FontColor
— Font color
[0 0 0]
(default) | RGB triplet | hexadecimal color code | 'r'
| 'g'
| 'b'
| ...
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.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
; for example,[0.4 0.6 0.7]
.A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red" | "r" | [1 0 0] | "#FF0000" | |
"green" | "g" | [0 1 0] | "#00FF00" | |
"blue" | "b" | [0 0 1] | "#0000FF" | |
"cyan"
| "c" | [0 1 1] | "#00FFFF" | |
"magenta" | "m" | [1 0 1] | "#FF00FF" | |
"yellow" | "y" | [1 1 0] | "#FFFF00" | |
"black" | "k" | [0 0 0] | "#000000" | |
"white" | "w" | [1 1 1] | "#FFFFFF" |
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410] | "#0072BD" | |
[0.8500 0.3250 0.0980] | "#D95319" | |
[0.9290 0.6940 0.1250] | "#EDB120" | |
[0.4940 0.1840 0.5560] | "#7E2F8E" | |
[0.4660 0.6740 0.1880] | "#77AC30" | |
[0.3010 0.7450 0.9330] | "#4DBEEE" | |
[0.6350 0.0780 0.1840] | "#A2142F" |
BackgroundColor
— Background color
[1 1 1]
(default) | RGB triplet | hexadecimal color code | 'r'
| 'g'
| 'b'
| ...
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.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
; for example,[0.4 0.6 0.7]
.A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red" | "r" | [1 0 0] | "#FF0000" | |
"green" | "g" | [0 1 0] | "#00FF00" | |
"blue" | "b" | [0 0 1] | "#0000FF" | |
"cyan"
| "c" | [0 1 1] | "#00FFFF" | |
"magenta" | "m" | [1 0 1] | "#FF00FF" | |
"yellow" | "y" | [1 1 0] | "#FFFF00" | |
"black" | "k" | [0 0 0] | "#000000" | |
"white" | "w" | [1 1 1] | "#FFFFFF" |
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410] | "#0072BD" | |
[0.8500 0.3250 0.0980] | "#D95319" | |
[0.9290 0.6940 0.1250] | "#EDB120" | |
[0.4940 0.1840 0.5560] | "#7E2F8E" | |
[0.4660 0.6740 0.1880] | "#77AC30" | |
[0.3010 0.7450 0.9330] | "#4DBEEE" | |
[0.6350 0.0780 0.1840] | "#A2142F" |
StyleConfigurations
— Configurations of added styles
empty n
-by-3 table array (default) | n
-by-3 table array
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)
Interactivity
Visible
— State of visibility
'on'
(default) | on/off logical value
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
.
'on'
— Display the object.'off'
— Hide the object without deleting it. You still can access the properties of an invisible UI component.
To make your app start faster, set the Visible
property to
'off'
for all UI components that do not need to appear at
startup.
Multiselect
— Multiple node selection
'off'
(default) | on/off logical value
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.
Editable
— Node text editability
'off'
(default) | on/off logical value
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.
Enable
— Operational state of tree
'on'
(default) | on/off logical value
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
.
If you set this property to
'on'
, the app user can interact with the tree and its nodes.If you set this property to
'off'
, the component appears dimmed, indicating that the app user cannot interact with it or its nodes, and that it will not trigger a callback.
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
— Tooltip
''
(default) | character vector | cell array of character vectors | string array | 1-D categorical array
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.
ContextMenu
— Context menu
empty GraphicsPlaceholder
array (default) | ContextMenu
object
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.
Position
Position
— Location and size
[20 20 100 300]
(default) | [left bottom width height]
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.
Element | Description |
---|---|
left | Distance from the inner left edge of the parent container to the left edge of the bounding box that encloses the tree |
bottom | Distance from the inner bottom edge of the parent container to the bottom edge of the bounding box that encloses the tree |
width | Distance between the right and left edges of the bounding box |
height | Distance between the top and bottom edges of the bounding box |
InnerPosition
— Location and size
[20 20 100 300]
(default) | [left bottom width height]
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.
OuterPosition
— Location and size
[20 20 100 300]
(default) | [left bottom width height]
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
— Layout options
empty LayoutOptions
array (default) | GridLayoutOptions
object
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];
Callbacks
SelectionChangedFcn
— Selection changed callback
''
(default) | function handle | cell array | character vector
Selection changed callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property |
Description |
---|---|
SelectedNodes |
Most recently selected |
PreviousSelectedNodes |
Previously selected |
Source |
Component that executes the callback |
EventName |
|
For more information about writing callbacks, see Callbacks in App Designer.
NodeExpandedFcn
— Node expanded callback
''
(default) | function handle | cell array | character vector
Node expanded callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property | Description |
---|---|
Node |
|
Source | Component that executes the callback |
EventName |
|
For more information about writing callbacks, see Callbacks in App Designer.
NodeCollapsedFcn
— Node collapsed callback
''
(default) | function handle | cell array | character vector
Node collapsed callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property | Description |
---|---|
Node |
|
Source | Component that executes the callback |
EventName |
|
For more information about writing callbacks, see Callbacks in App Designer.
NodeTextChangedFcn
— Node text changed callback
''
(default) | function handle | cell array | character vector
Node text changed callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property | Description |
---|---|
Node |
|
Text | New node text |
PreviousText | Previous node text |
Source | Component that executes the callback |
EventName |
|
For more information about writing callbacks, see Callbacks in App Designer.
ClickedFcn
— Clicked callback
''
(default) | function handle | cell array | character vector
Clicked callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property | Value |
---|---|
InteractionInformation | Information about where in the component the app user clicked. This information is stored as an object with these properties:
You can query the object properties using dot notation. For
example, |
Source | Component that executes the callback |
EventName | 'Clicked' |
This table lists the properties of the InteractionInformation
object associated with the tree UI
component.
Property | Value |
---|---|
Node | Clicked node, returned as a If the user clicked an area of the tree that is not
associated with a node, then |
Level | Level of the clicked node, returned as a scalar. Nodes parented
directly to the If
the user clicked an area of the tree that is not associated with a node,
then |
Location | Location where the user clicked relative to the bottom-left corner
of the tree parent container, returned as a two-element vector of the form
The value of |
ScreenLocation | Location where the user clicked relative to the bottom-left corner
of their primary display, returned as a two-element vector of the form
The value of |
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:
Use the
event.InteractionInformation
object to access information about whether the user clicked a tree node.If the user did click a tree node (as opposed to a location in the tree that is not associated with a node), open a file selection dialog box for the user to choose an image for the tree node icon.
Update the tree node icon to display the selected image.
Bring keyboard focus back to the tree.
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
DoubleClickedFcn
— Double-clicked callback
''
(default) | function handle | cell array | character vector
Double-clicked callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
Property | Value |
---|---|
InteractionInformation | Information about where in the component the app user double-clicked. This information is stored as an object with these properties:
You can query the object properties using dot notation. For
example, |
Source | Component that executes the callback |
EventName | 'DoubleClicked' |
This table lists the properties of the InteractionInformation
object associated with the tree UI
component.
Property | Value |
---|---|
Node | Double-clicked node, returned as a If the user double-clicked an area of the tree that is
not associated with a node, then |
Level | Level of the double-clicked node, returned as a scalar. Nodes
parented directly to the If the user double-clicked an area of the tree that is not
associated with a node, then |
Location | Location where the user double-clicked relative to the bottom-left
corner of the tree parent container, returned as a two-element vector of the
form The value of |
ScreenLocation | Location where the user double-clicked relative to the bottom-left
corner of their primary display, returned as a two-element vector of the
form The value of |
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:
Use the
event.InteractionInformation
object to access information about whether the user double-clicked a tree node.If the user did double-click a tree node (as opposed to a location in the tree that is not associated with a node), open a file selection dialog box for the user to choose an image for the tree node icon.
Update the tree node icon to display the selected image.
Bring keyboard focus back to the tree.
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
CreateFcn
— Creation function
''
(default) | function handle | cell array | character vector
Object creation function, specified as one of these values:
Function handle.
Cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
Character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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.
DeleteFcn
— Deletion function
''
(default) | function handle | cell array | character vector
Object deletion function, specified as one of these values:
Function handle.
Cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
Character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
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 Execution Control
Interruptible
— Callback interruption
'on'
(default) | on/off logical value
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:
The running callback is the currently executing callback.
The interrupting callback is a callback that tries to interrupt the running callback.
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:
If the value of
Interruptible
is'off'
, then no interruption occurs. Instead, theBusyAction
property of the object that owns the interrupting callback determines if the interrupting callback is discarded or added to the callback queue.If the value of
Interruptible
is'on'
, then the interruption occurs. The next time MATLAB processes the callback queue, it stops the execution of the running callback and executes the interrupting callback. After the interrupting callback completes, MATLAB then resumes executing the running callback.
Note
Callback interruption and execution behave differently in these situations:
If the interrupting callback is a
DeleteFcn
,CloseRequestFcn
, orSizeChangedFcn
callback, then the interruption occurs regardless of theInterruptible
property value.If the running callback is currently executing the
waitfor
function, then the interruption occurs regardless of theInterruptible
property value.If the interrupting callback is owned by a
Timer
object, then the callback executes according to schedule regardless of theInterruptible
property value.
BusyAction
— Callback queuing
'queue'
(default) | 'cancel'
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 running callback is the currently executing callback.
The interrupting callback is a callback that tries to interrupt the running callback.
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:
'queue'
— Puts the interrupting callback in a queue to be processed after the running callback finishes execution.'cancel'
— Does not execute the interrupting callback.
BeingDeleted
— Deletion status
on/off logical value
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/Child
Parent
— Parent container
Figure
object (default) | Panel
object | Tab
object | ButtonGroup
object | GridLayout
object
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
— Children
empty GraphicsPlaceholder
array (default) | array of TreeNode
objects
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.
HandleVisibility
— Visibility of object handle
'on'
(default) | 'callback'
| 'off'
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.
HandleVisibility Value | Description |
---|---|
'on' | The object is always visible. |
'callback' | The object is visible from within callbacks or functions invoked by callbacks, but not from within functions invoked from the command line. This option blocks access to the object at the command-line, but allows callback functions to access it. |
'off' | The object is invisible at all times. This option is useful
for preventing unintended changes to the UI by another function. Set
the HandleVisibility to 'off' to
temporarily hide the object during the execution of that function.
|
Identifiers
Type
— Type of graphics object
'uitree'
This property is read-only.
Type of graphics object, returned as 'uitree'
.
Tag
— Object identifier
''
(default) | character vector | string scalar
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.
UserData
— User data
[]
(default) | array
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.
Object Functions
Examples
Style Tree Nodes to Indicate File Type
Style nodes in a tree that showcases a file structure to visually distinguish different file types.
Create a tree UI component. Each top-level node represents a folder. Each child node represents a file in that folder. Expand the tree to see all the nodes.
fig = uifigure("Position",[300 300 350 400]); t = uitree(fig); % Parent nodes n1 = uitreenode(t,"Text","App 1"); n2 = uitreenode(t,"Text","App 2"); n3 = uitreenode(t,"Text","Images"); % Child nodes n11 = uitreenode(n1,"Text","myapp1.m"); n21 = uitreenode(n2,"Text","myapp2.m"); n22 = uitreenode(n2,"Text","app2callback.m"); n31 = uitreenode(n3,"Text","peppers.png"); expand(t)
Create three styles: one with a bold font weight, one with an italic font angle, and one with an icon.
dirStyle = uistyle("FontWeight","bold"); mStyle = uistyle("FontAngle","italic"); imgStyle = uistyle("Icon","peppers.png");
Apply the bold style to the top-level nodes to distinguish the nodes that
represent folders. Apply the italic style to the children of the App
1
and App 2
nodes to distinguish the nodes that
represent MATLAB program files. Finally, apply the icon style to the node that
represents an image file to show a preview of the image.
addStyle(t,dirStyle,"level",1) addStyle(t,mStyle,"node",[n1.Children;n2.Children]) addStyle(t,imgStyle,"node",n31)
Create Callback for Tree Node Selection
Create an app that displays athlete names grouped by sport. When the app user clicks on a name, MATLAB displays data about the athlete.
Create a program file called mytreeapp.m
that contains the following commands to create a tree, a set of nested tree nodes, and a callback function for the tree. The SelectionChangedFcn
property specifies the function to execute when the user clicks a node in the tree.
function mytreeapp fig = uifigure; t = uitree(fig,"Position",[20 20 150 150]); % Assign callback in response to node selection t.SelectionChangedFcn = @nodechange; % First level nodes category1 = uitreenode(t,"Text","Runners","NodeData",[]); category2 = uitreenode(t,"Text","Cyclists","NodeData",[]); % Second level nodes. % Node data is age (y), height (m), weight (kg) p1 = uitreenode(category1,"Text","Joe","NodeData",[40 1.67 58] ); p2 = uitreenode(category1,"Text","Linda","NodeData",[49 1.83 90]); p3 = uitreenode(category2,"Text","Rajeev","NodeData",[25 1.47 53]); p4 = uitreenode(category2,"Text","Anne","NodeData",[88 1.92 100]); % Expand the tree expand(t); % Create the function for the SelectionChangedFcn callback % When the function is executed, it displays the data of the selected item function nodechange(src,event) node = event.SelectedNodes; display(node.NodeData); end end
When the user runs mytreeapp
and clicks a node in the tree, MATLAB displays the NodeData
for that node.
Version History
Introduced in R2017bR2022b: Program a response to a user clicking or double-clicking the tree
Use the ClickedFcn
and DoubleClickedFcn
callback
properties to program a response to a user clicking and double-clicking the tree.
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