Merge pull request #670 from twitchyliquid64/text_backend

Refactor textual hit testing into a `renderer::Backend` method

4 files changed, 32 insertions, 2 deletions

diff --git a/core/src/keyboard.rs b/core/src/keyboard.rs
index cb64701a..6827a4db 100644
--- a/core/src/keyboard.rs
+++ b/core/src/keyboard.rs
@@ -1,4 +1,4 @@
-//! Reuse basic keyboard types.
+//! Listen to keyboard events.
 mod event;
 mod hotkey;
 mod key_code;
diff --git a/core/src/lib.rs b/core/src/lib.rs
index c4288158..a0decdab 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -17,6 +17,7 @@
 pub mod keyboard;
 pub mod menu;
 pub mod mouse;
+pub mod text;
 
 mod align;
 mod background;
diff --git a/core/src/mouse.rs b/core/src/mouse.rs
index 25ce6ac3..48214f65 100644
--- a/core/src/mouse.rs
+++ b/core/src/mouse.rs
@@ -1,4 +1,4 @@
-//! Reuse basic mouse types.
+//! Handle mouse events.
 mod button;
 mod event;
 mod interaction;
diff --git a/core/src/text.rs b/core/src/text.rs
new file mode 100644
index 00000000..ded22eef
--- /dev/null
+++ b/core/src/text.rs
@@ -0,0 +1,29 @@
+//! Draw and interact with text.
+use crate::Vector;
+
+/// The result of hit testing on text.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Hit {
+    /// The point was within the bounds of the returned character index.
+    CharOffset(usize),
+    /// The provided point was not within the bounds of a glyph. The index
+    /// of the character with the closest centeroid position is returned,
+    /// as well as its delta.
+    NearestCharOffset(usize, Vector),
+}
+
+impl Hit {
+    /// Computes the cursor position corresponding to this [`HitTestResult`] .
+    pub fn cursor(&self) -> usize {
+        match self {
+            Self::CharOffset(i) => *i,
+            Self::NearestCharOffset(i, delta) => {
+                if delta.x > f32::EPSILON {
+                    i + 1
+                } else {
+                    *i
+                }
+            }
+        }
+    }
+}