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Render the ParamSlider value

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Robbert van der Helm 2022-02-09 19:45:54 +01:00
parent b61d17fee9
commit e1f80e203a
1 changed files with 80 additions and 28 deletions
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108
nih_plug_egui/src/widgets/param_slider.rs
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@ -20,16 +20,30 @@ lazy_static! {
/// TODO: Check below for more input methods that should be added
/// TODO: Decouple the logic from the drawing so we can also do things like nobs without having to
/// repeat everything
/// TODO: Add WidgetInfo annotations for accessibility
#[must_use = "You should put this widget in an ui with `ui.add(widget);`"]
pub struct ParamSlider<'a, P: Param> {
param: &'a P,
setter: &'a ParamSetter<'a>,
draw_value: bool,
}
impl<'a, P: Param> ParamSlider<'a, P> {
/// Create a new slider for a parameter. Use the other methods to modify the slider before
/// passing it to [Ui::add()].
pub fn for_param(param: &'a P, setter: &'a ParamSetter<'a>) -> Self {
Self { param, setter }
Self {
param,
setter,
draw_value: true,
}
}
/// Don't draw the text slider's current value after the slider.
pub fn without_value(mut self) -> Self {
self.draw_value = false;
self
}
fn normalized_value(&self) -> f32 {
@ -104,7 +118,7 @@ impl<'a, P: Param> ParamSlider<'a, P> {
ui.memory().data.insert_temp(*DRAG_AMOUNT_MEMORY_ID, amount);
}
fn slider_ui(&self, ui: &Ui, response: &Response) {
fn slider_ui(&self, ui: &mut Ui, response: &Response) {
// Handle user input
// TODO: Optionally (since it can be annoying) add scrolling behind a builder option
// TODO: Optionally add alt+click for value entry?
@ -161,37 +175,75 @@ impl<'a, P: Param> ParamSlider<'a, P> {
);
}
}
fn value_ui(&self, ui: &mut Ui) {
let visuals = ui.visuals().widgets.inactive;
let should_draw_frame = ui.visuals().button_frame;
let padding = ui.spacing().button_padding;
let text = ui.painter().layout(
format!("{}", self.param),
TextStyle::Button,
visuals.text_color(),
ui.available_width() - (padding.x * 2.0),
);
let (_, rect) = ui.allocate_space(text.size() + (padding * 2.0));
if ui.is_rect_visible(rect) {
if should_draw_frame {
let fill = visuals.bg_fill;
let stroke = visuals.bg_stroke;
ui.painter().rect(
rect.expand(visuals.expansion),
visuals.corner_radius,
fill,
stroke,
);
}
let text_pos = ui
.layout()
.align_size_within_rect(text.size(), rect.shrink2(padding))
.min;
ui.painter().galley(text_pos, text);
}
}
}
impl<P: Param> Widget for ParamSlider<'_, P> {
fn ui(self, ui: &mut Ui) -> Response {
// Allocate space, but add some padding on the top and bottom to make it look a bit slimmer.
let height = ui
.fonts()
.row_height(TextStyle::Body)
.max(ui.spacing().interact_size.y);
let slider_height = ui.painter().round_to_pixel(height * 0.65);
let response = ui
.vertical(|ui| {
ui.allocate_space(vec2(
ui.spacing().slider_width,
(height - slider_height) / 2.0,
));
let response = ui.allocate_response(
vec2(ui.spacing().slider_width, slider_height),
Sense::click_and_drag(),
);
ui.allocate_space(vec2(
ui.spacing().slider_width,
(height - slider_height) / 2.0,
));
response
})
.inner;
ui.horizontal(|ui| {
// Allocate space, but add some padding on the top and bottom to make it look a bit slimmer.
let height = ui
.fonts()
.row_height(TextStyle::Body)
.max(ui.spacing().interact_size.y);
let slider_height = ui.painter().round_to_pixel(height * 0.65);
let response = ui
.vertical(|ui| {
ui.allocate_space(vec2(
ui.spacing().slider_width,
(height - slider_height) / 2.0,
));
let response = ui.allocate_response(
vec2(ui.spacing().slider_width, slider_height),
Sense::click_and_drag(),
);
ui.allocate_space(vec2(
ui.spacing().slider_width,
(height - slider_height) / 2.0,
));
response
})
.inner;
// TODO: Render the text
self.slider_ui(ui, &response);
self.slider_ui(ui, &response);
if self.draw_value {
self.value_ui(ui);
}
response
response
})
.inner
}
}