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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT
use crate::{Display, Surface};
use glib::{prelude::*, translate::*};
use std::fmt;
glib::wrapper! {
/// Base class for objects implementing different rendering methods.
///
/// [`DrawContext`][crate::DrawContext] is the base object used by contexts implementing different
/// rendering methods, such as [`CairoContext`][crate::CairoContext] or [`GLContext`][crate::GLContext].
/// It provides shared functionality between those contexts.
///
/// You will always interact with one of those subclasses.
///
/// A [`DrawContext`][crate::DrawContext] is always associated with a single toplevel surface.
///
/// This is an Abstract Base Class, you cannot instantiate it.
///
/// ## Properties
///
///
/// #### `display`
/// The [`Display`][crate::Display] used to create the [`DrawContext`][crate::DrawContext].
///
/// Readable | Writeable | Construct Only
///
///
/// #### `surface`
/// The [`Surface`][crate::Surface] the context is bound to.
///
/// Readable | Writeable | Construct Only
///
/// # Implements
///
/// [`DrawContextExt`][trait@crate::prelude::DrawContextExt], [`DrawContextExtManual`][trait@crate::prelude::DrawContextExtManual]
#[doc(alias = "GdkDrawContext")]
pub struct DrawContext(Object<ffi::GdkDrawContext>);
match fn {
type_ => || ffi::gdk_draw_context_get_type(),
}
}
impl DrawContext {
pub const NONE: Option<&'static DrawContext> = None;
}
/// Trait containing all [`struct@DrawContext`] methods.
///
/// # Implementors
///
/// [`CairoContext`][struct@crate::CairoContext], [`DrawContext`][struct@crate::DrawContext], [`GLContext`][struct@crate::GLContext], [`VulkanContext`][struct@crate::VulkanContext]
pub trait DrawContextExt: 'static {
/// 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 [`CairoContext`][crate::CairoContext] and a [`GLContext`][crate::GLContext]
/// need to be treated differently.
///
/// A call to this function is a requirement for drawing and must be
/// followed by a call to [`end_frame()`][Self::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 [`DrawContextExtManual::frame_region()`][crate::prelude::DrawContextExtManual::frame_region()] to
/// query the region that must be drawn.
///
/// When using GTK, the widget system automatically places calls to
/// gdk_draw_context_begin_frame() and gdk_draw_context_end_frame() via the
/// use of `Gsk::Renderer`s, so application code does not need to call
/// these functions explicitly.
/// ## `region`
/// minimum region that should be drawn
#[doc(alias = "gdk_draw_context_begin_frame")]
fn begin_frame(&self, region: &cairo::Region);
/// Ends a drawing operation started with gdk_draw_context_begin_frame().
///
/// This makes the drawing available on screen.
/// See [`begin_frame()`][Self::begin_frame()] for more details about drawing.
///
/// When using a [`GLContext`][crate::GLContext], this function may call `glFlush()`
/// implicitly before returning; it is not recommended to call `glFlush()`
/// explicitly before calling this function.
#[doc(alias = "gdk_draw_context_end_frame")]
fn end_frame(&self);
/// Retrieves the [`Display`][crate::Display] the @self is created for
///
/// # Returns
///
/// the [`Display`][crate::Display]
#[doc(alias = "gdk_draw_context_get_display")]
#[doc(alias = "get_display")]
fn display(&self) -> Option<Display>;
/// Retrieves the surface that @self is bound to.
///
/// # Returns
///
/// a [`Surface`][crate::Surface]
#[doc(alias = "gdk_draw_context_get_surface")]
#[doc(alias = "get_surface")]
fn surface(&self) -> Option<Surface>;
/// Returns [`true`] if @self is in the process of drawing to its surface.
///
/// This is the case between calls to [`begin_frame()`][Self::begin_frame()]
/// and [`end_frame()`][Self::end_frame()]. In this situation, drawing commands
/// may be effecting the contents of the @self's surface.
///
/// # Returns
///
/// [`true`] if the context is between [`begin_frame()`][Self::begin_frame()]
/// and [`end_frame()`][Self::end_frame()] calls.
#[doc(alias = "gdk_draw_context_is_in_frame")]
fn is_in_frame(&self) -> bool;
}
impl<O: IsA<DrawContext>> DrawContextExt for O {
fn begin_frame(&self, region: &cairo::Region) {
unsafe {
ffi::gdk_draw_context_begin_frame(
self.as_ref().to_glib_none().0,
region.to_glib_none().0,
);
}
}
fn end_frame(&self) {
unsafe {
ffi::gdk_draw_context_end_frame(self.as_ref().to_glib_none().0);
}
}
fn display(&self) -> Option<Display> {
unsafe {
from_glib_none(ffi::gdk_draw_context_get_display(
self.as_ref().to_glib_none().0,
))
}
}
fn surface(&self) -> Option<Surface> {
unsafe {
from_glib_none(ffi::gdk_draw_context_get_surface(
self.as_ref().to_glib_none().0,
))
}
}
fn is_in_frame(&self) -> bool {
unsafe {
from_glib(ffi::gdk_draw_context_is_in_frame(
self.as_ref().to_glib_none().0,
))
}
}
}
impl fmt::Display for DrawContext {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("DrawContext")
}
}