1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
// 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;
use crate::Surface;
use glib::object::IsA;
use glib::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.
    ///
    /// # 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")
    }
}