vastly improved selection system

src/state/editor.rs

@@ -1,3 +1,5 @@
+use std::ops::RangeInclusive;
+
 use cagire_ratatui::Editor;
 
 #[derive(Clone, Copy, PartialEq, Eq)]
@@ -50,14 +52,36 @@ pub struct EditorContext {
     pub step: usize,
     pub focus: Focus,
     pub editor: Editor,
-    pub copied_step: Option<CopiedStep>,
+    pub selection_anchor: Option<usize>,
+    pub copied_steps: Option<CopiedSteps>,
 }
 
-#[derive(Clone, Copy)]
-pub struct CopiedStep {
+#[derive(Clone)]
+pub struct CopiedSteps {
     pub bank: usize,
     pub pattern: usize,
-    pub step: usize,
+    pub steps: Vec<CopiedStepData>,
+}
+
+#[derive(Clone)]
+pub struct CopiedStepData {
+    pub script: String,
+    pub active: bool,
+    pub source: Option<usize>,
+    pub original_index: usize,
+}
+
+impl EditorContext {
+    pub fn selection_range(&self) -> Option<RangeInclusive<usize>> {
+        let anchor = self.selection_anchor?;
+        let a = anchor.min(self.step);
+        let b = anchor.max(self.step);
+        Some(a..=b)
+    }
+
+    pub fn clear_selection(&mut self) {
+        self.selection_anchor = None;
+    }
 }
 
 impl Default for EditorContext {
@@ -68,7 +92,8 @@ impl Default for EditorContext {
             step: 0,
             focus: Focus::Sequencer,
             editor: Editor::new(),
-            copied_step: None,
+            selection_anchor: None,
+            copied_steps: None,
         }
     }
 }