gtk4/subclass/
tree_drag_source.rs

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
// Take a look at the license at the top of the repository in the LICENSE file.

// rustdoc-stripper-ignore-next
//! Traits intended for implementing the
//! [`TreeDragSource`](crate::TreeDragSource) interface.

use glib::translate::*;

use crate::{ffi, prelude::*, subclass::prelude::*, TreeDragSource, TreePath};

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait TreeDragSourceImpl: ObjectImpl {
    fn row_draggable(&self, path: &TreePath) -> bool {
        self.parent_row_draggable(path)
    }
    fn drag_data_get(&self, path: &TreePath) -> gdk::ContentProvider;
    fn drag_data_delete(&self, path: &TreePath) -> bool;
}

mod sealed {
    pub trait Sealed {}
    impl<T: super::TreeDragSourceImplExt> Sealed for T {}
}

#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait TreeDragSourceImplExt: sealed::Sealed + ObjectSubclass {
    // Returns true if the row can be dragged
    fn parent_row_draggable(&self, path: &TreePath) -> bool {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<TreeDragSource>()
                as *const ffi::GtkTreeDragSourceIface;

            if let Some(func) = (*parent_iface).row_draggable {
                from_glib(func(
                    self.obj()
                        .unsafe_cast_ref::<TreeDragSource>()
                        .to_glib_none()
                        .0,
                    mut_override(path.to_glib_none().0),
                ))
            } else {
                // Assume the row is draggable by default
                true
            }
        }
    }

    fn parent_drag_data_get(&self, path: &TreePath) -> gdk::ContentProvider {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<TreeDragSource>()
                as *const ffi::GtkTreeDragSourceIface;

            let func = (*parent_iface)
                .drag_data_get
                .expect("no parent \"drag_data_get\" implementation");

            from_glib_full(func(
                self.obj()
                    .unsafe_cast_ref::<TreeDragSource>()
                    .to_glib_none()
                    .0,
                mut_override(path.to_glib_none().0),
            ))
        }
    }

    // True if the row was successfully deleted
    fn parent_drag_data_delete(&self, path: &TreePath) -> bool {
        unsafe {
            let type_data = Self::type_data();
            let parent_iface = type_data.as_ref().parent_interface::<TreeDragSource>()
                as *const ffi::GtkTreeDragSourceIface;

            let func = (*parent_iface)
                .drag_data_delete
                .expect("no parent \"drag_data_delete\" implementation");

            from_glib(func(
                self.obj()
                    .unsafe_cast_ref::<TreeDragSource>()
                    .to_glib_none()
                    .0,
                mut_override(path.to_glib_none().0),
            ))
        }
    }
}

impl<T: TreeDragSourceImpl> TreeDragSourceImplExt for T {}

unsafe impl<T: TreeDragSourceImpl> IsImplementable<T> for TreeDragSource {
    fn interface_init(iface: &mut glib::Interface<Self>) {
        let iface = iface.as_mut();

        assert_initialized_main_thread!();

        iface.row_draggable = Some(tree_drag_source_row_draggable::<T>);
        iface.drag_data_get = Some(tree_drag_source_drag_data_get::<T>);
        iface.drag_data_delete = Some(tree_drag_source_drag_data_delete::<T>);
    }
}

unsafe extern "C" fn tree_drag_source_row_draggable<T: TreeDragSourceImpl>(
    tree_drag_source: *mut ffi::GtkTreeDragSource,
    pathptr: *mut ffi::GtkTreePath,
) -> glib::ffi::gboolean {
    let instance = &*(tree_drag_source as *mut T::Instance);
    let imp = instance.imp();

    let path: Borrowed<TreePath> = from_glib_borrow(pathptr);

    imp.row_draggable(&path).into_glib()
}

unsafe extern "C" fn tree_drag_source_drag_data_get<T: TreeDragSourceImpl>(
    tree_drag_source: *mut ffi::GtkTreeDragSource,
    pathptr: *mut ffi::GtkTreePath,
) -> *mut gdk::ffi::GdkContentProvider {
    let instance = &*(tree_drag_source as *mut T::Instance);
    let imp = instance.imp();
    let path: Borrowed<TreePath> = from_glib_borrow(pathptr);

    imp.drag_data_get(&path).into_glib_ptr()
}

unsafe extern "C" fn tree_drag_source_drag_data_delete<T: TreeDragSourceImpl>(
    tree_drag_source: *mut ffi::GtkTreeDragSource,
    pathptr: *mut ffi::GtkTreePath,
) -> glib::ffi::gboolean {
    let instance = &*(tree_drag_source as *mut T::Instance);
    let imp = instance.imp();
    let path: Borrowed<TreePath> = from_glib_borrow(pathptr);
    imp.drag_data_delete(&path).into_glib()
}