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Add scrolling for the X-Y pad

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Robbert van der Helm 2022-11-22 15:23:08 +01:00
parent 753ca201a6
commit 5e4cfb0e5a
1 changed files with 50 additions and 1 deletions
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51
plugins/diopser/src/editor/xy_pad.rs
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@ -49,6 +49,11 @@ pub struct XyPad {
/// This keeps track of whether the user has pressed shift and a granular drag is active. This
/// works exactly the same as in `ParamSlider`.
granular_drag_status: Option<GranularDragStatus>,
/// The number of (fractional) scrolled lines that have not yet been turned into parameter
/// change events. This is needed to support trackpads with smooth scrolling. This probably
/// doesn't make much sense for devices without horizontal scrolling, but we'll support it
/// anyways because why not.
scrolled_lines: (f32, f32),
// Used to position the tooltip so it's anchored to the mouse cursor, set in the `MouseMove`
// event handler so the tooltip stays at the top right of the mouse cursor.
@ -108,6 +113,7 @@ impl XyPad {
text_input_active: false,
drag_active: false,
granular_drag_status: None,
scrolled_lines: (0.0, 0.0),
tooltip_pos_x: Pixels(0.0),
tooltip_pos_y: Pixels(0.0),
@ -529,7 +535,50 @@ impl View for XyPad {
);
}
}
// TODO: Scrolling, because why not. Could be useful on laptops/with touchpads.
WindowEvent::MouseScroll(scroll_x, scroll_y) => {
// With a regular scroll wheel `scroll_*` will only ever be -1 or 1, but with smooth
// scrolling trackpads being a these `scroll_*` can be anything.
let (remaining_scroll_x, remaining_scroll_y) = &mut self.scrolled_lines;
*remaining_scroll_x += scroll_x;
*remaining_scroll_y += scroll_y;
for (param_base, scrolled_lines) in [
(&self.x_param_base, remaining_scroll_x),
(&self.y_param_base, remaining_scroll_y),
] {
if scrolled_lines.abs() >= 1.0 {
let use_finer_steps = cx.modifiers.shift();
// Scrolling while dragging needs to be taken into account here
if !self.drag_active {
param_base.begin_set_parameter(cx);
}
let mut current_value = param_base.unmodulated_normalized_value();
while *scrolled_lines >= 1.0 {
current_value =
param_base.next_normalized_step(current_value, use_finer_steps);
param_base.set_normalized_value(cx, current_value);
*scrolled_lines -= 1.0;
}
while *scrolled_lines <= -1.0 {
current_value =
param_base.previous_normalized_step(current_value, use_finer_steps);
param_base.set_normalized_value(cx, current_value);
*scrolled_lines += 1.0;
}
if !self.drag_active {
param_base.end_set_parameter(cx);
}
}
}
meta.consume();
}
_ => {}
});
}