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Enable scrolling with smooth scroll

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This commit is contained in:
Christopher Lübbemeier 2017-12-06 18:21:43 +01:00
parent 68b610cef0
commit 02c5276e62
1 changed files with 34 additions and 6 deletions
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40
src/shell.rs
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@ -346,11 +346,15 @@ impl State {
pub struct UiState {
mouse_pressed: bool,
scroll_delta: (f64, f64),
}
impl UiState {
pub fn new() -> UiState {
UiState { mouse_pressed: false }
UiState {
mouse_pressed: false,
scroll_delta: (0.0, 0.0),
}
}
}
@ -416,8 +420,8 @@ impl Shell {
state.drawing_area.set_events(
(gdk_sys::GDK_BUTTON_RELEASE_MASK | gdk_sys::GDK_BUTTON_PRESS_MASK |
gdk_sys::GDK_BUTTON_MOTION_MASK |
gdk_sys::GDK_SCROLL_MASK)
gdk_sys::GDK_BUTTON_MOTION_MASK | gdk_sys::GDK_SCROLL_MASK |
gdk_sys::GDK_SMOOTH_SCROLL_MASK)
.bits() as i32,
);
@ -489,8 +493,9 @@ impl Shell {
});
let ref_state = self.state.clone();
let ref_ui_state = self.ui_state.clone();
state.drawing_area.connect_scroll_event(move |_, ev| {
gtk_scroll_event(&mut *ref_state.borrow_mut(), ev)
gtk_scroll_event(&mut *ref_state.borrow_mut(), &mut *ref_ui_state.borrow_mut(), ev)
});
let ref_state = self.state.clone();
@ -626,7 +631,7 @@ fn gtk_focus_out(state: &mut State) -> Inhibit {
Inhibit(false)
}
fn gtk_scroll_event(state: &mut State, ev: &EventScroll) -> Inhibit {
fn gtk_scroll_event(state: &mut State, ui_state: &mut UiState, ev: &EventScroll) -> Inhibit {
if !state.mouse_enabled {
return Inhibit(false);
}
@ -646,7 +651,30 @@ fn gtk_scroll_event(state: &mut State, ev: &EventScroll) -> Inhibit {
gdk_sys::GdkScrollDirection::Down => {
mouse_input(state, "ScrollWheelDown", ev.get_state(), ev.get_position())
}
_ => (),
gdk_sys::GdkScrollDirection::Smooth => {
// Remember and accumulate scroll deltas, so slow scrolling still
// works.
ui_state.scroll_delta.0 += ev.as_ref().delta_x;
ui_state.scroll_delta.1 += ev.as_ref().delta_y;
// Perform scroll action for deltas with abs(delta) >= 1.
let x = ui_state.scroll_delta.0 as isize;
let y = ui_state.scroll_delta.1 as isize;
for _ in 0..x {
mouse_input(state, "ScrollWheelRight", ev.get_state(), ev.get_position())
}
for _ in 0..-x {
mouse_input(state, "ScrollWheelLeft", ev.get_state(), ev.get_position())
}
for _ in 0..y {
mouse_input(state, "ScrollWheelDown", ev.get_state(), ev.get_position())
}
for _ in 0..-y {
mouse_input(state, "ScrollWheelUp", ev.get_state(), ev.get_position())
}
// Subtract performed scroll deltas.
ui_state.scroll_delta.0 -= x as f64;
ui_state.scroll_delta.1 -= y as f64;
}
}
Inhibit(false)
}