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Cross-widget text select (#3870)

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* Closes https://github.com/emilk/egui/issues/3816


![cross-widget-text-selection](https://github.com/emilk/egui/assets/1148717/5582b9d2-8b04-47b7-9637-f48e44064a70)

Turn off with `style.interaction.multi_widget_text_select`.

There is an API for this in `LabelSelectionState`, but it's pretty
bare-bones.

This became really hairy implementation-wise, but it works decently
well.

# Limitations
* Drag-select to scroll doesn't work
* A selection disappears if you scroll past one of its end-points
* Only the text of labels and links are selectable
 
## TODO
* [x] An option to turn it off
* [x] An API for querying about the selected text, and to deselect it.
* [x] Scrolling past selection behaves weird
* [x] Shift-click to select a range
This commit is contained in:
Emil Ernerfeldt
2024-01-24 15:45:22 +01:00
committed by GitHub
parent bcf032a08f
commit 41aad74552
19 changed files with 714 additions and 139 deletions
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15
crates/emath/src/range.rs
View File

@@ -125,6 +125,21 @@ impl Rangef {
max: self.max.min(other.max),
}
}
/// Do the two ranges intersect?
///
/// ```
/// # use emath::Rangef;
/// assert!(Rangef::new(0.0, 10.0).intersects(Rangef::new(5.0, 15.0)));
/// assert!(Rangef::new(0.0, 10.0).intersects(Rangef::new(5.0, 6.0)));
/// assert!(Rangef::new(0.0, 10.0).intersects(Rangef::new(10.0, 20.0)));
/// assert!(!Rangef::new(0.0, 10.0).intersects(Rangef::new(20.0, 30.0)));
/// ```
#[inline]
#[must_use]
pub fn intersects(self, other: Self) -> bool {
other.min <= self.max && self.min <= other.max
}
}
impl From<Rangef> for RangeInclusive<f32> {