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feat(custom): support mouse wheel on slider

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Jake Stanger 2023-04-22 21:23:33 +01:00
parent 74d18aedfb
commit 1fa0c0e977
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2 changed files with 28 additions and 10 deletions
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21
docs/modules/Custom.md
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@ -76,16 +76,17 @@ A draggable slider.
Note that `on_change` will provide the **floating point** value as an argument.
If your input program requires an integer, you will need to round it.
| Name | Type | Default | Description |
|---------------|----------------------------------------------------|--------------|------------------------------------------------------------------------------|
| `src` | `image` | `null` | Image source. See [here](images) for information on images. |
| `size` | `integer` | `null` | Width/height of the image. Aspect ratio is preserved. |
| `orientation` | `horizontal` or `vertical` (shorthand: `h` or `v`) | `horizontal` | Orientation of the slider. |
| `value` | `Script` | `null` | Script to run to get the slider value. Output must be a valid number. |
| `on_change` | `string [command]` | `null` | Command to execute when the slider changes. More on this [below](#commands). |
| `min` | `float` | `0` | Minimum slider value. |
| `max` | `float` | `100` | Maximum slider value. |
| `length` | `integer` | `null` | Slider length. GTK will automatically size if left unset. |
| Name | Type | Default | Description |
|---------------|----------------------------------------------------|--------------|---------------------------------------------------------------------------------------------------------------------------------|
| `src` | `image` | `null` | Image source. See [here](images) for information on images. |
| `size` | `integer` | `null` | Width/height of the image. Aspect ratio is preserved. |
| `orientation` | `horizontal` or `vertical` (shorthand: `h` or `v`) | `horizontal` | Orientation of the slider. |
| `value` | `Script` | `null` | Script to run to get the slider value. Output must be a valid number. |
| `on_change` | `string [command]` | `null` | Command to execute when the slider changes. More on this [below](#commands). |
| `min` | `float` | `0` | Minimum slider value. |
| `max` | `float` | `100` | Maximum slider value. |
| `step` | `float` | - | The increment to change when scrolling with the mouse wheel. If left blank, will use the default determined by the environment. |
| `length` | `integer` | `null` | Slider length. GTK will automatically size if left unset. |
The example slider widget below shows a volume control for MPC,
which updates the server when changed, and polls the server for volume changes to keep the slider in sync.

17
src/modules/custom/slider.rs
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@ -7,6 +7,7 @@ use gtk::prelude::*;
use gtk::Scale;
use serde::Deserialize;
use std::cell::Cell;
use std::ops::Neg;
use tokio::spawn;
use tracing::error;
@ -21,6 +22,7 @@ pub struct SliderWidget {
min: f64,
#[serde(default = "default_max")]
max: f64,
step: Option<f64>,
length: Option<i32>,
}
@ -53,11 +55,26 @@ impl CustomWidget for SliderWidget {
if let Some(on_change) = self.on_change {
let min = self.min;
let max = self.max;
let step = self.step;
let tx = context.tx.clone();
// GTK will spam the same value over and over
let prev_value = Cell::new(scale.value());
scale.connect_scroll_event(move |scale, event| {
let value = scale.value();
let delta = event.delta().1.neg();
let delta = match (step, delta.is_sign_positive()) {
(Some(step), true) => step,
(Some(step), false) => -step,
(None, _) => delta,
};
scale.set_value(value + delta);
Inhibit(false)
});
scale.connect_change_value(move |scale, _, val| {
// GTK will send values outside min/max range
let val = val.clamp(min, max);