Class Button

Button is a View that provides an item that invokes an System.Action when activated by the user.
Inheritance
System.Object
Responder
View
Button
Implements
System.IDisposable
System.ComponentModel.ISupportInitializeNotification
System.ComponentModel.ISupportInitialize
Remarks

Provides a button showing text invokes an System.Action when clicked on with a mouse or when the user presses SPACE, ENTER, or hotkey. The hotkey is the first letter or digit following the first underscore ('_') in the button text.

Use HotKeySpecifier to change the hotkey specifier from the default of ('_').

If no hotkey specifier is found, the first uppercase letter encountered will be used as the hotkey.

When the button is configured as the default (IsDefault) and the user presses the ENTER key, if no other View processes the KeyEvent, the Button's System.Action will be invoked.

Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Terminal.Gui
Assembly: Terminal.Gui.dll
Syntax
public class Button : View, IDisposable, ISupportInitializeNotification, ISupportInitialize

Constructors

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Button()

Initializes a new instance of Button using Computed layout.
Declaration
public Button()
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Button(Int32, Int32, ustring)

Initializes a new instance of Button using Absolute layout, based on the given text
Declaration
public Button(int x, int y, ustring text)
Parameters
Type Name Description
System.Int32 x X position where the button will be shown.
System.Int32 y Y position where the button will be shown.
ustring text The button's text
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Button(Int32, Int32, ustring, Boolean)

Initializes a new instance of Button using Absolute layout, based on the given text.
Declaration
public Button(int x, int y, ustring text, bool is_default)
Parameters
Type Name Description
System.Int32 x X position where the button will be shown.
System.Int32 y Y position where the button will be shown.
ustring text The button's text
System.Boolean is_default If true, a special decoration is used, and the user pressing the enter key in a Dialog will implicitly activate this button.
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Button(ustring, Boolean)

Initializes a new instance of Button using Computed layout.
Declaration
public Button(ustring text, bool is_default = false)
Parameters
Type Name Description
ustring text The button's text
System.Boolean is_default If true, a special decoration is used, and the user pressing the enter key in a Dialog will implicitly activate this button.

Properties

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HotKey

Gets or sets the HotKey defined for this view. A user pressing HotKey on the keyboard while this view has focus will cause the Clicked event to fire.
Declaration
public override Key HotKey { get; set; }
Property Value
Type Description
Key
Overrides
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IsDefault

Gets or sets whether the Button is the default action to activate in a dialog.
Declaration
public bool IsDefault { get; set; }
Property Value
Type Description
System.Boolean true if is default; otherwise, false.

Methods

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MouseEvent(MouseEvent)

Method invoked when a mouse event is generated
Declaration
public override bool MouseEvent(MouseEvent me)
Parameters
Type Name Description
MouseEvent me
Returns
Type Description
System.Boolean true, if the event was handled, false otherwise.
Overrides
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OnClicked()

Virtual method to invoke the Clicked event.
Declaration
public virtual void OnClicked()
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OnEnter(View)

Method invoked when a view gets focus.
Declaration
public override bool OnEnter(View view)
Parameters
Type Name Description
View view The view that is losing focus.
Returns
Type Description
System.Boolean true, if the event was handled, false otherwise.
Overrides
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PositionCursor()

Positions the cursor in the right position based on the currently focused view in the chain.
Declaration
public override void PositionCursor()
Overrides
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ProcessColdKey(KeyEvent)

This method can be overwritten by views that want to provide accelerator functionality (Alt-key for example), but without interefering with normal ProcessKey behavior.
Declaration
public override bool ProcessColdKey(KeyEvent kb)
Parameters
Type Name Description
KeyEvent kb
Returns
Type Description
System.Boolean
Overrides
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ProcessHotKey(KeyEvent)

This method can be overwritten by view that want to provide accelerator functionality (Alt-key for example).
Declaration
public override bool ProcessHotKey(KeyEvent kb)
Parameters
Type Name Description
KeyEvent kb
Returns
Type Description
System.Boolean
Overrides
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ProcessKey(KeyEvent)

If the view is focused, gives the view a chance to process the keystroke.
Declaration
public override bool ProcessKey(KeyEvent kb)
Parameters
Type Name Description
KeyEvent kb
Returns
Type Description
System.Boolean
Overrides
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UpdateTextFormatterText()

Can be overridden if the Text has different format than the default.
Declaration
protected override void UpdateTextFormatterText()
Overrides

Events

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Clicked

Clicked System.Action, raised when the user clicks the primary mouse button within the Bounds of this View or if the user presses the action key while this view is focused. (TODO: IsDefault)
Declaration
public event Action Clicked
Event Type
Type Description
System.Action

Implements

System.IDisposable
System.ComponentModel.ISupportInitializeNotification
System.ComponentModel.ISupportInitialize