Class Toplevel

Toplevel views can be modally executed.
Inheritance
System.Object
Responder
View
Toplevel
Window
Implements
System.IDisposable
System.Collections.IEnumerable
System.ComponentModel.ISupportInitializeNotification
System.ComponentModel.ISupportInitialize
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 Toplevel : View, IDisposable, IEnumerable, ISupportInitializeNotification, ISupportInitialize
Remarks

Toplevels can be modally executing views, started by calling Run(Toplevel, Boolean). They return control to the caller when RequestStop() has been called (which sets the Running property to false).

A Toplevel is created when an application initialzies Terminal.Gui by callling Init(ConsoleDriver, IMainLoopDriver). The application Toplevel can be accessed via Top. Additional Toplevels can be created and run (e.g. Dialogs. To run a Toplevel, create the Toplevel and call Run(Toplevel, Boolean).

Toplevels can also opt-in to more sophisticated initialization by implementing System.ComponentModel.ISupportInitialize. When they do so, the System.ComponentModel.ISupportInitialize.BeginInit() and System.ComponentModel.ISupportInitialize.EndInit() methods will be called before running the view. If first-run-only initialization is preferred, the System.ComponentModel.ISupportInitializeNotification can be implemented too, in which case the System.ComponentModel.ISupportInitialize methods will only be called if System.ComponentModel.ISupportInitializeNotification.IsInitialized is false. This allows proper View inheritance hierarchies to override base class layout code optimally by doing so only on first run, instead of on every run.

Constructors

Toplevel()

Initializes a new instance of the Toplevel class with Computed layout, defaulting to full screen.
Declaration
public Toplevel()

Toplevel(Rect)

Initializes a new instance of the Toplevel class with the specified absolute layout.
Declaration
public Toplevel(Rect frame)
Parameters
Type Name Description
Rect frame A superview-relative rectangle specifying the location and size for the new Toplevel

Fields

Ready

Fired once the Toplevel's MainLoop has started it's first iteration. Subscribe to this event to perform tasks when the Toplevel has been laid out and focus has been set. changes. A Ready event handler is a good place to finalize initialization after calling `Run()(topLevel)`.
Declaration
public Action Ready
Field Value
Type Description
System.Action

Properties

CanFocus

Gets or sets a value indicating whether this Toplevel can focus.
Declaration
public override bool CanFocus { get; }
Property Value
Type Description
System.Boolean true if can focus; otherwise, false.
Overrides

MenuBar

Gets or sets the menu for this Toplevel
Declaration
public MenuBar MenuBar { get; set; }
Property Value
Type Description
MenuBar

Modal

Determines whether the Toplevel is modal or not. Causes ProcessKey(KeyEvent) to propagate keys upwards by default unless set to true.
Declaration
public bool Modal { get; set; }
Property Value
Type Description
System.Boolean

Running

Gets or sets whether the MainLoop for this Toplevel is running or not.
Declaration
public bool Running { get; set; }
Property Value
Type Description
System.Boolean
Remarks
Setting this property directly is discouraged. Use RequestStop() instead.

StatusBar

Gets or sets the status bar for this Toplevel
Declaration
public StatusBar StatusBar { get; set; }
Property Value
Type Description
StatusBar

Methods

Add(View)

Declaration
public override void Add(View view)
Parameters
Type Name Description
View view
Overrides

Create()

Convenience factory method that creates a new Toplevel with the current terminal dimensions.
Declaration
public static Toplevel Create()
Returns
Type Description
Toplevel The create.

OnKeyDown(KeyEvent)

Declaration
public override bool OnKeyDown(KeyEvent keyEvent)
Parameters
Type Name Description
KeyEvent keyEvent
Returns
Type Description
System.Boolean
Overrides

OnKeyUp(KeyEvent)

Declaration
public override bool OnKeyUp(KeyEvent keyEvent)
Parameters
Type Name Description
KeyEvent keyEvent
Returns
Type Description
System.Boolean
Overrides

ProcessKey(KeyEvent)

Declaration
public override bool ProcessKey(KeyEvent keyEvent)
Parameters
Type Name Description
KeyEvent keyEvent
Returns
Type Description
System.Boolean
Overrides

Redraw(Rect)

Declaration
public override void Redraw(Rect bounds)
Parameters
Type Name Description
Rect bounds
Overrides

Remove(View)

Declaration
public override void Remove(View view)
Parameters
Type Name Description
View view
Overrides

RemoveAll()

Declaration
public override void RemoveAll()
Overrides

WillPresent()

Invoked by Begin(Toplevel) as part of the Run(Toplevel, Boolean) after the views have been laid out, and before the views are drawn for the first time.
Declaration
public virtual void WillPresent()

Implements

System.IDisposable
System.Collections.IEnumerable
System.ComponentModel.ISupportInitializeNotification
System.ComponentModel.ISupportInitialize