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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files.git)
// DO NOT EDIT

use crate::EventController;
use crate::EventControllerScrollFlags;
use crate::PropagationLimit;
use crate::PropagationPhase;
use glib::object::Cast;
use glib::object::ObjectType as ObjectType_;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use glib::StaticType;
use glib::ToValue;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;

glib::wrapper! {
    /// [`EventControllerScroll`][crate::EventControllerScroll] is an event controller that handles scroll
    /// events.
    ///
    /// It is capable of handling both discrete and continuous scroll
    /// events from mice or touchpads, abstracting them both with the
    /// `signal::EventControllerScroll::scroll` signal. Deltas in
    /// the discrete case are multiples of 1.
    ///
    /// In the case of continuous scroll events, [`EventControllerScroll`][crate::EventControllerScroll]
    /// encloses all `signal::EventControllerScroll::scroll` emissions
    /// between two `signal::EventControllerScroll::scroll-begin` and
    /// `signal::EventControllerScroll::scroll-end` signals.
    ///
    /// The behavior of the event controller can be modified by the flags
    /// given at creation time, or modified at a later point through
    /// [`set_flags()`][Self::set_flags()] (e.g. because the scrolling
    /// conditions of the widget changed).
    ///
    /// The controller can be set up to emit motion for either/both vertical
    /// and horizontal scroll events through [`EventControllerScrollFlags::VERTICAL`][crate::EventControllerScrollFlags::VERTICAL],
    /// [`EventControllerScrollFlags::HORIZONTAL`][crate::EventControllerScrollFlags::HORIZONTAL] and [`EventControllerScrollFlags::BOTH_AXES`][crate::EventControllerScrollFlags::BOTH_AXES].
    /// If any axis is disabled, the respective `signal::EventControllerScroll::scroll`
    /// delta will be 0. Vertical scroll events will be translated to horizontal
    /// motion for the devices incapable of horizontal scrolling.
    ///
    /// The event controller can also be forced to emit discrete events on all
    /// devices through [`EventControllerScrollFlags::DISCRETE`][crate::EventControllerScrollFlags::DISCRETE]. This can be used
    /// to implement discrete actions triggered through scroll events (e.g.
    /// switching across combobox options).
    ///
    /// The [`EventControllerScrollFlags::KINETIC`][crate::EventControllerScrollFlags::KINETIC] flag toggles the emission of the
    /// `signal::EventControllerScroll::decelerate` signal, emitted at the end
    /// of scrolling with two X/Y velocity arguments that are consistent with the
    /// motion that was received.
    ///
    /// # Implements
    ///
    /// [`EventControllerExt`][trait@crate::prelude::EventControllerExt], [`trait@glib::ObjectExt`]
    #[doc(alias = "GtkEventControllerScroll")]
    pub struct EventControllerScroll(Object<ffi::GtkEventControllerScroll, ffi::GtkEventControllerScrollClass>) @extends EventController;

    match fn {
        type_ => || ffi::gtk_event_controller_scroll_get_type(),
    }
}

impl EventControllerScroll {
    /// Creates a new event controller that will handle scroll events.
    /// ## `flags`
    /// flags affecting the controller behavior
    ///
    /// # Returns
    ///
    /// a new [`EventControllerScroll`][crate::EventControllerScroll]
    #[doc(alias = "gtk_event_controller_scroll_new")]
    pub fn new(flags: EventControllerScrollFlags) -> EventControllerScroll {
        assert_initialized_main_thread!();
        unsafe {
            EventController::from_glib_full(ffi::gtk_event_controller_scroll_new(flags.into_glib()))
                .unsafe_cast()
        }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`EventControllerScroll`] objects.
    ///
    /// This method returns an instance of [`EventControllerScrollBuilder`](crate::builders::EventControllerScrollBuilder) which can be used to create [`EventControllerScroll`] objects.
    pub fn builder() -> EventControllerScrollBuilder {
        EventControllerScrollBuilder::default()
    }

    /// Gets the flags conditioning the scroll controller behavior.
    ///
    /// # Returns
    ///
    /// the controller flags.
    #[doc(alias = "gtk_event_controller_scroll_get_flags")]
    #[doc(alias = "get_flags")]
    pub fn flags(&self) -> EventControllerScrollFlags {
        unsafe {
            from_glib(ffi::gtk_event_controller_scroll_get_flags(
                self.to_glib_none().0,
            ))
        }
    }

    /// Gets the scroll unit of the last
    /// `signal::EventControllerScroll::scroll` signal received.
    ///
    /// Always returns [`gdk::ScrollUnit::Wheel`][crate::gdk::ScrollUnit::Wheel] if the
    /// [`EventControllerScrollFlags::DISCRETE`][crate::EventControllerScrollFlags::DISCRETE] flag is set.
    ///
    /// # Returns
    ///
    /// the scroll unit.
    #[cfg(any(feature = "v4_8", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v4_8")))]
    #[doc(alias = "gtk_event_controller_scroll_get_unit")]
    #[doc(alias = "get_unit")]
    pub fn unit(&self) -> gdk::ScrollUnit {
        unsafe {
            from_glib(ffi::gtk_event_controller_scroll_get_unit(
                self.to_glib_none().0,
            ))
        }
    }

    /// Sets the flags conditioning scroll controller behavior.
    /// ## `flags`
    /// flags affecting the controller behavior
    #[doc(alias = "gtk_event_controller_scroll_set_flags")]
    pub fn set_flags(&self, flags: EventControllerScrollFlags) {
        unsafe {
            ffi::gtk_event_controller_scroll_set_flags(self.to_glib_none().0, flags.into_glib());
        }
    }

    /// Emitted after scroll is finished if the
    /// [`EventControllerScrollFlags::KINETIC`][crate::EventControllerScrollFlags::KINETIC] flag is set.
    ///
    /// @vel_x and @vel_y express the initial velocity that was
    /// imprinted by the scroll events. @vel_x and @vel_y are expressed in
    /// pixels/ms.
    /// ## `vel_x`
    /// X velocity
    /// ## `vel_y`
    /// Y velocity
    #[doc(alias = "decelerate")]
    pub fn connect_decelerate<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn decelerate_trampoline<
            F: Fn(&EventControllerScroll, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkEventControllerScroll,
            vel_x: libc::c_double,
            vel_y: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this), vel_x, vel_y)
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"decelerate\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    decelerate_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that the widget should scroll by the
    /// amount specified by @dx and @dy.
    ///
    /// For the representation unit of the deltas, see
    /// [`unit()`][Self::unit()].
    /// ## `dx`
    /// X delta
    /// ## `dy`
    /// Y delta
    ///
    /// # Returns
    ///
    /// [`true`] if the scroll event was handled,
    ///   [`false`] otherwise.
    #[doc(alias = "scroll")]
    pub fn connect_scroll<F: Fn(&Self, f64, f64) -> glib::signal::Inhibit + 'static>(
        &self,
        f: F,
    ) -> SignalHandlerId {
        unsafe extern "C" fn scroll_trampoline<
            F: Fn(&EventControllerScroll, f64, f64) -> glib::signal::Inhibit + 'static,
        >(
            this: *mut ffi::GtkEventControllerScroll,
            dx: libc::c_double,
            dy: libc::c_double,
            f: glib::ffi::gpointer,
        ) -> glib::ffi::gboolean {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this), dx, dy).into_glib()
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that a new scrolling operation has begun.
    ///
    /// It will only be emitted on devices capable of it.
    #[doc(alias = "scroll-begin")]
    pub fn connect_scroll_begin<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn scroll_begin_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll-begin\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_begin_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that a scrolling operation has finished.
    ///
    /// It will only be emitted on devices capable of it.
    #[doc(alias = "scroll-end")]
    pub fn connect_scroll_end<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn scroll_end_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll-end\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_end_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[doc(alias = "flags")]
    pub fn connect_flags_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_flags_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::flags\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_flags_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl Default for EventControllerScroll {
    fn default() -> Self {
        glib::object::Object::new::<Self>(&[])
            .expect("Can't construct EventControllerScroll object with default parameters")
    }
}

#[derive(Clone, Default)]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`EventControllerScroll`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct EventControllerScrollBuilder {
    flags: Option<EventControllerScrollFlags>,
    name: Option<String>,
    propagation_limit: Option<PropagationLimit>,
    propagation_phase: Option<PropagationPhase>,
}

impl EventControllerScrollBuilder {
    // rustdoc-stripper-ignore-next
    /// Create a new [`EventControllerScrollBuilder`].
    pub fn new() -> Self {
        Self::default()
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`EventControllerScroll`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> EventControllerScroll {
        let mut properties: Vec<(&str, &dyn ToValue)> = vec![];
        if let Some(ref flags) = self.flags {
            properties.push(("flags", flags));
        }
        if let Some(ref name) = self.name {
            properties.push(("name", name));
        }
        if let Some(ref propagation_limit) = self.propagation_limit {
            properties.push(("propagation-limit", propagation_limit));
        }
        if let Some(ref propagation_phase) = self.propagation_phase {
            properties.push(("propagation-phase", propagation_phase));
        }
        glib::Object::new::<EventControllerScroll>(&properties)
            .expect("Failed to create an instance of EventControllerScroll")
    }

    /// The flags affecting event controller behavior.
    pub fn flags(mut self, flags: EventControllerScrollFlags) -> Self {
        self.flags = Some(flags);
        self
    }

    /// The name for this controller, typically used for debugging purposes.
    pub fn name(mut self, name: &str) -> Self {
        self.name = Some(name.to_string());
        self
    }

    /// The limit for which events this controller will handle.
    pub fn propagation_limit(mut self, propagation_limit: PropagationLimit) -> Self {
        self.propagation_limit = Some(propagation_limit);
        self
    }

    /// The propagation phase at which this controller will handle events.
    pub fn propagation_phase(mut self, propagation_phase: PropagationPhase) -> Self {
        self.propagation_phase = Some(propagation_phase);
        self
    }
}

impl fmt::Display for EventControllerScroll {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("EventControllerScroll")
    }
}