vizia_core/text/
selection.rs

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1use std::ops::Range;
2
3#[derive(Debug, Clone, Copy)]
4pub struct Selection {
5    pub anchor: usize,
6    pub active: usize,
7    pub h_pos: Option<f32>,
8}
9
10impl Selection {
11    pub fn new(anchor: usize, active: usize) -> Self {
12        Selection { anchor, active, h_pos: None }
13    }
14
15    /// Construct a new selection from this selection, with the provided h_pos.
16    ///
17    /// # Note
18    ///
19    /// `h_pos` is used to track the *pixel* location of the cursor when moving
20    /// vertically; lines may have available cursor positions at different
21    /// positions, and arrowing down and then back up should always result
22    /// in a cursor at the original starting location; doing this correctly
23    /// requires tracking this state.
24    ///
25    /// You *probably* don't need to use this, unless you are implementing a new
26    /// text field, or otherwise implementing vertical cursor motion, in which
27    /// case you will want to set this during vertical motion if it is not
28    /// already set.
29    pub fn with_h_pos(mut self, h_pos: Option<f32>) -> Self {
30        self.h_pos = h_pos;
31        self
32    }
33
34    pub fn caret(caret: usize) -> Self {
35        Selection { anchor: caret, active: caret, h_pos: None }
36    }
37
38    pub fn min(&self) -> usize {
39        usize::min(self.anchor, self.active)
40    }
41
42    pub fn max(&self) -> usize {
43        usize::max(self.anchor, self.active)
44    }
45
46    pub fn range(&self) -> Range<usize> {
47        self.min()..self.max()
48    }
49
50    pub fn is_caret(&self) -> bool {
51        self.min() == self.max()
52    }
53}
vizia_core/text/selection.rs

vizia_core/text/
selection.rs
