Class Application

A static, singelton class provding the main application driver for Terminal.Gui apps.

Inheritance

System.Object

Application

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)

System.Object.ToString()

Namespace: Terminal.Gui

Assembly: Terminal.Gui.dll

Syntax

public static class Application

Remarks

Creates a instance of MainLoop to process input events, handle timers and other sources of data. It is accessible via the MainLoop property.

You can hook up to the Iteration event to have your method invoked on each iteration of the MainLoop.

When invoked sets the SynchronizationContext to one that is tied to the mainloop, allowing user code to use async/await.

Examples

// A simple Terminal.Gui app that creates a window with a frame and title with 
// 5 rows/columns of padding.
Application.Init();
var win = new Window ("Hello World - CTRL-Q to quit") {
    X = 5,
    Y = 5,
    Width = Dim.Fill (5),
    Height = Dim.Fill (5)
};
Application.Top.Add(win);
Application.Run();

Fields

Driver

The current ConsoleDriver in use.

Declaration

public static ConsoleDriver Driver

Field Value

Type	Description
ConsoleDriver

Iteration

This event is raised on each iteration of the MainLoop

Declaration

public static Action Iteration

Field Value

Type	Description
System.Action

Remarks

See also System.Threading.Timeout

Resized

Invoked when the terminal was resized. The new size of the terminal is provided.

Declaration

public static Action<Application.ResizedEventArgs> Resized

Field Value

Type	Description
System.Action<Application.ResizedEventArgs>

RootMouseEvent

Merely a debugging aid to see the raw mouse events

Declaration

public static Action<MouseEvent> RootMouseEvent

Field Value

Type	Description
System.Action<MouseEvent>

UseSystemConsole

If set, it forces the use of the System.Console-based driver.

Declaration

public static bool UseSystemConsole

Field Value

Type	Description
System.Boolean

Properties

AlwaysSetPosition

Used only by Terminal.Gui.NetDriver to forcing always moving the cursor position when writing to the screen.

Declaration

public static bool AlwaysSetPosition { get; set; }

Property Value

Type	Description
System.Boolean

Current

The current Toplevel object. This is updated when Run(Func<Exception, Boolean>) enters and leaves to point to the current Toplevel .

Declaration

public static Toplevel Current { get; }

Property Value

Type	Description
Toplevel	The current.

HeightAsBuffer

The current HeightAsBuffer used in the terminal.

Declaration

public static bool HeightAsBuffer { get; set; }

Property Value

Type	Description
System.Boolean

MainLoop

The MainLoop driver for the application

Declaration

public static MainLoop MainLoop { get; }

Property Value

Type	Description
MainLoop	The main loop.

Top

The Toplevel object used for the application on startup (Top)

Declaration

public static Toplevel Top { get; }

Property Value

Type	Description
Toplevel	The top.

Methods

Begin(Toplevel)

Building block API: Prepares the provided Toplevel for execution.

Declaration

public static Application.RunState Begin(Toplevel toplevel)

Parameters

Type	Name	Description
Toplevel	toplevel	Toplevel to prepare execution for.

Returns

Type	Description
Application.RunState	The runstate handle that needs to be passed to the End(Application.RunState) method upon completion.

Remarks

This method prepares the provided toplevel for running with the focus, it adds this to the list of toplevels, sets up the mainloop to process the event, lays out the subviews, focuses the first element, and draws the toplevel in the screen. This is usually followed by executing the RunLoop(Application.RunState, Boolean) method, and then the End(Application.RunState) method upon termination which will undo these changes.

End(Application.RunState)

Building block API: completes the execution of a Toplevel that was started with Begin(Toplevel) .

Declaration

public static void End(Application.RunState runState)

Parameters

Type	Name	Description
Application.RunState	runState	The runstate returned by the Begin(Toplevel) method.

GrabMouse(View)

Grabs the mouse, forcing all mouse events to be routed to the specified view until UngrabMouse is called.

Declaration

public static void GrabMouse(View view)

Parameters

Type	Name	Description
View	view	View that will receive all mouse events until UngrabMouse is invoked.

Init(ConsoleDriver, IMainLoopDriver)

Initializes a new instance of Terminal.Gui Application.

Declaration

public static void Init(ConsoleDriver driver = null, IMainLoopDriver mainLoopDriver = null)

Parameters

Type	Name	Description
ConsoleDriver	driver
IMainLoopDriver	mainLoopDriver

Remarks

Call this method once per instance (or after Shutdown() has been called).

Loads the right ConsoleDriver for the platform.

Creates a Toplevel and assigns it to Top

MakeCenteredRect(Size)

Returns a rectangle that is centered in the screen for the provided size.

Declaration

public static Rect MakeCenteredRect(Size size)

Parameters

Type	Name	Description
Size	size	Size for the rectangle.

Returns

Type	Description
Rect	The centered rect.

Refresh()

Triggers a refresh of the entire display.

Declaration

public static void Refresh()

RequestStop()

Stops running the most recent Toplevel.

Declaration

public static void RequestStop()

Remarks

This will cause Run(Func<Exception, Boolean>) to return.

Calling RequestStop() is equivalent to setting the Running property on the curently running Toplevel to false.

Run(Func<Exception, Boolean>)

Runs the application by calling Run(Toplevel, Func<Exception, Boolean>) with the value of Top

Declaration

public static void Run(Func<Exception, bool> errorHandler = null)

Parameters

Type	Name	Description
System.Func<System.Exception, System.Boolean>	errorHandler

Run(Toplevel, Func<Exception, Boolean>)

Runs the main loop on the given Toplevel container.

Declaration

public static void Run(Toplevel view, Func<Exception, bool> errorHandler = null)

Parameters

Type	Name	Description
Toplevel	view	The Toplevel tu run modally.
System.Func<System.Exception, System.Boolean>	errorHandler	Handler for any unhandled exceptions (resumes when returns true, rethrows when null).

Remarks

This method is used to start processing events for the main application, but it is also used to run other modal Views such as Dialog boxes.

To make a Run(Toplevel, Func<Exception, Boolean>) stop execution, call RequestStop().

Calling Run(Toplevel, Func<Exception, Boolean>) is equivalent to calling Begin(Toplevel), followed by RunLoop(Application.RunState, Boolean), and then calling End(Application.RunState).

Alternatively, to have a program control the main loop and process events manually, call Begin(Toplevel) to set things up manually and then repeatedly call RunLoop(Application.RunState, Boolean) with the wait parameter set to false. By doing this the RunLoop(Application.RunState, Boolean) method will only process any pending events, timers, idle handlers and then return control immediately.

When errorHandler is null the exception is rethrown, when it returns true the application is resumed and when false method exits gracefully.

Run<T>(Func<Exception, Boolean>)

Runs the application by calling Run(Toplevel, Func<Exception, Boolean>) with a new instance of the specified Toplevel-derived class

Declaration

public static void Run<T>(Func<Exception, bool> errorHandler = null)

    where T : Toplevel, new()

Parameters

Type	Name	Description
System.Func<System.Exception, System.Boolean>	errorHandler

Type Parameters

Name	Description
T

RunLoop(Application.RunState, Boolean)

Building block API: Runs the main loop for the created dialog

Declaration

public static void RunLoop(Application.RunState state, bool wait = true)

Parameters

Type	Name	Description
Application.RunState	state	The state returned by the Begin method.
System.Boolean	wait	By default this is true which will execute the runloop waiting for events, if you pass false, you can use this method to run a single iteration of the events.

Remarks

Use the wait parameter to control whether this is a blocking or non-blocking call.

Shutdown()

Shutdown an application initialized with Init(ConsoleDriver, IMainLoopDriver)

Declaration

public static void Shutdown()

UngrabMouse()

Releases the mouse grab, so mouse events will be routed to the view on which the mouse is.

Declaration

public static void UngrabMouse()