Gdk.DrawContext¶

Subclasses:: Gdk.CairoContext, Gdk.GLContext, Gdk.VulkanContext

Methods¶

Inherited:: GObject.Object (37)
Structs:: GObject.ObjectClass (5)

	`begin_frame` (region)
	`end_frame` ()
	`get_display` ()
	`get_frame_region` ()
	`get_surface` ()
	`is_in_frame` ()

Virtual Methods¶

Inherited:: GObject.Object (7)

Properties¶

Name	Type	Flags	Short Description
`display`	`Gdk.Display`	r/w/co
`surface`	`Gdk.Surface`	r/w/co

Signals¶

Inherited:: GObject.Object (1)

Fields¶

Inherited:: GObject.Object (1)

Class Details¶

class Gdk.DrawContext(**kwargs)¶

Bases:: GObject.Object
Abstract:: Yes

Base class for objects implementing different rendering methods.

GdkDrawContext is the base object used by contexts implementing different rendering methods, such as [class`Gdk`.CairoContext] or [class`Gdk`.GLContext]. It provides shared functionality between those contexts.

You will always interact with one of those subclasses.

A GdkDrawContext is always associated with a single toplevel surface.

begin_frame(region)[source]¶

Parameters:: region (cairo.Region) – minimum region that should be drawn

Indicates that you are beginning the process of redrawing region on the self's surface.

Calling this function begins a drawing operation using self on the surface that self was created from. The actual requirements and guarantees for the drawing operation vary for different implementations of drawing, so a [class`Gdk`.CairoContext] and a [class`Gdk`.GLContext] need to be treated differently.

A call to this function is a requirement for drawing and must be followed by a call to [method`Gdk`.DrawContext.end_frame], which will complete the drawing operation and ensure the contents become visible on screen.

Note that the region passed to this function is the minimum region that needs to be drawn and depending on implementation, windowing system and hardware in use, it might be necessary to draw a larger region. Drawing implementation must use [method`Gdk`.DrawContext.get_frame_region] to query the region that must be drawn.

When using GTK, the widget system automatically places calls to Gdk.DrawContext.begin_frame() and Gdk.DrawContext.end_frame() via the use of `GskRenderer <../gsk4/class.Renderer.html>`__s, so application code does not need to call these functions explicitly.

end_frame()[source]¶

Ends a drawing operation started with Gdk.DrawContext.begin_frame().

This makes the drawing available on screen. See [method`Gdk`.DrawContext.begin_frame] for more details about drawing.

When using a [class`Gdk`.GLContext], this function may call glFlush() implicitly before returning; it is not recommended to call glFlush() explicitly before calling this function.

get_display()[source]¶

Returns:: the GdkDisplay
Return type:: Gdk.Display or None

Retrieves the GdkDisplay the self is created for

get_frame_region()[source]¶

Returns:: a Cairo region
Return type:: cairo.Region or None

Retrieves the region that is currently being repainted.

After a call to [method`Gdk`.DrawContext.begin_frame] this function will return a union of the region passed to that function and the area of the surface that the self determined needs to be repainted.

If self is not in between calls to [method`Gdk`.DrawContext.begin_frame] and [method`Gdk`.DrawContext.end_frame], None will be returned.

get_surface()[source]¶

Returns:: a GdkSurface
Return type:: Gdk.Surface or None

Retrieves the surface that self is bound to.

is_in_frame()[source]¶

Returns:: True if the context is between [method`Gdk`.DrawContext.begin_frame] and [method`Gdk`.DrawContext.end_frame] calls.
Return type:: bool

Returns True if self is in the process of drawing to its surface.

This is the case between calls to [method`Gdk`.DrawContext.begin_frame] and [method`Gdk`.DrawContext.end_frame]. In this situation, drawing commands may be effecting the contents of the self's surface.

Property Details¶

Gdk.DrawContext.props.display¶

Name:: display
Type:: Gdk.Display
Default Value:: None
Flags:: READABLE, WRITABLE, CONSTRUCT_ONLY

The GdkDisplay used to create the GdkDrawContext.

Gdk.DrawContext.props.surface¶

Name:: surface
Type:: Gdk.Surface
Default Value:: None
Flags:: READABLE, WRITABLE, CONSTRUCT_ONLY

The GdkSurface the context is bound to.