Scrolling

pulse-ui/src/widget/scroll.rs

@@ -0,0 +1,67 @@
+use crate::widget::Widget;
+
+pub struct ScrollState<const N: usize>(pub usize, pub [usize; N]);
+
+pub struct ScrollText {
+    pub scroll: usize,
+    pub title: String,
+    pub text: String,
+}
+
+impl Widget for ScrollText {
+    fn render(&self, scope: &mut crate::render::RenderScope) {
+        scope.draw_text(0, &self.title);
+
+        let title_lines = self.title.lines().count();
+
+        for (y, line) in self
+            .text
+            .lines()
+            .skip(self.scroll)
+            .take(scope.rect.height as usize - title_lines)
+            .enumerate()
+        {
+            scope.draw_text((0, (y + title_lines) as u16), line);
+        }
+    }
+}
+
+impl<const N: usize> ScrollState<N> {
+    pub fn get_selected(&self, index: usize) -> &'static str {
+        if index == self.0 { "\x1b[32m" } else { "" }
+    }
+
+    pub fn scroll(&self, index: usize, title: String, text: String) -> ScrollText {
+        ScrollText {
+            scroll: self.1[index],
+            title,
+            text,
+        }
+    }
+
+    pub fn up(&mut self) {
+        if self.1[self.0] > 0 {
+            self.1[self.0] -= 1;
+        }
+    }
+
+    pub fn down(&mut self) {
+        self.1[self.0] += 1;
+    }
+
+    pub fn back_tab(&mut self) {
+        if self.0 > 0 {
+            self.0 -= 1;
+        } else {
+            self.0 = N - 1;
+        }
+    }
+
+    pub fn tab(&mut self) {
+        if self.0 + 1 < N {
+            self.0 += 1;
+        } else {
+            self.0 = 0;
+        }
+    }
+}