mouse: Remove verify_screen_coords, refactor primary selection modification

helix-core/src/selection.rs

@@ -329,11 +329,18 @@ pub struct Selection {
 impl Selection {
     // eq
 
+    #[inline]
     #[must_use]
     pub fn primary(&self) -> Range {
         self.ranges[self.primary_index]
     }
 
+    #[inline]
+    #[must_use]
+    pub fn primary_mut(&mut self) -> &mut Range {
+        &mut self.ranges[self.primary_index]
+    }
+
     /// Ensure selection containing only the primary selection.
     pub fn into_single(self) -> Self {
         if self.ranges.len() == 1 {

helix-term/src/ui/editor.rs

@@ -815,25 +815,21 @@ impl Component for EditorView {
                 let editor = &mut cx.editor;
 
                 let result = editor.tree.views().find_map(|(view, _focus)| {
-                    view.pos_at_screen_coords(
-                        &editor.documents[view.doc],
-                        row as usize,
-                        column as usize,
-                    )
+                    view.pos_at_screen_coords(&editor.documents[view.doc], row, column)
                         .map(|pos| (pos, view.id))
                 });
 
-                if let Some((pos, id)) = result {
-                    let doc = &mut editor.documents[editor.tree.get(id).doc];
+                if let Some((pos, view_id)) = result {
+                    let doc = &mut editor.documents[editor.tree.get(view_id).doc];
 
                     if modifiers == crossterm::event::KeyModifiers::ALT {
-                        let selection = doc.selection(id).clone();
-                        doc.set_selection(id, selection.push(Range::point(pos)));
+                        let selection = doc.selection(view_id).clone();
+                        doc.set_selection(view_id, selection.push(Range::point(pos)));
                     } else {
-                        doc.set_selection(id, Selection::point(pos));
+                        doc.set_selection(view_id, Selection::point(pos));
                     }
 
-                    editor.tree.focus = id;
+                    editor.tree.focus = view_id;
 
                     return EventResult::Consumed(None);
                 }
@@ -849,22 +845,15 @@ impl Component for EditorView {
             }) => {
                 let (view, doc) = current!(cx.editor);
 
-                let pos = view.pos_at_screen_coords(doc, row as usize, column as usize);
-
-                if pos == None {
-                    return EventResult::Ignored;
-                }
-
-                let selection = doc.selection(view.id).clone();
-                let primary_anchor = selection.primary().anchor;
-                let new_selection = selection.transform(|range| -> Range {
-                    if range.anchor == primary_anchor {
-                        return Range::new(primary_anchor, pos.unwrap());
-                    }
-                    range
-                });
+                let pos = match view.pos_at_screen_coords(doc, row, column) {
+                    Some(pos) => pos,
+                    None => return EventResult::Ignored,
+                };
 
-                doc.set_selection(view.id, new_selection);
+                let mut selection = doc.selection(view.id).clone();
+                let primary = selection.primary_mut();
+                *primary = Range::new(primary.anchor, pos);
+                doc.set_selection(view.id, selection);
                 EventResult::Consumed(None)
             }
             Event::Mouse(_) => EventResult::Ignored,

helix-view/src/view.rs

@@ -166,38 +166,26 @@ impl View {
         Some(Position::new(row, col))
     }
 
-    /// Verifies whether a screen position is inside the view
-    /// Returns true when position is inside the view
-    pub fn verify_screen_coords(&self, row: usize, column: usize) -> bool {
-        // 2 for status
-        if row < self.area.y as usize || row > self.area.y as usize + self.area.height as usize - 2
-        {
-            return false;
-        }
-
-        // TODO: not ideal
-        const OFFSET: usize = 7; // 1 diagnostic + 5 linenr + 1 gutter
-
-        if column < self.area.x as usize + OFFSET
-            || column > self.area.x as usize + self.area.width as usize
-        {
-            return false;
-        }
-        true
-    }
-
     pub fn text_pos_at_screen_coords(
         &self,
         text: &RopeSlice,
-        row: usize,
-        column: usize,
+        row: u16,
+        column: u16,
         tab_width: usize,
     ) -> Option<usize> {
-        if !self.verify_screen_coords(row, column) {
+        // TODO: not ideal
+        const OFFSET: u16 = 7; // 1 diagnostic + 5 linenr + 1 gutter
+
+        // 2 for status
+        if row < self.area.top() || row > self.area.bottom().saturating_sub(2) {
             return None;
         }
 
-        let line_number = row - self.area.y as usize + self.first_line;
+        if column < self.area.left() + OFFSET || column > self.area.right() {
+            return None;
+        }
+
+        let line_number = (row - self.area.y) as usize + self.first_line;
 
         if line_number > text.len_lines() - 1 {
             return Some(text.len_chars());
@@ -207,10 +195,7 @@ impl View {
 
         let current_line = text.line(line_number);
 
-        // TODO: not ideal
-        const OFFSET: usize = 7; // 1 diagnostic + 5 linenr + 1 gutter
-
-        let target = column - OFFSET - self.area.x as usize + self.first_col;
+        let target = (column - OFFSET - self.area.x) as usize + self.first_col;
         let mut selected = 0;
 
         for grapheme in RopeGraphemes::new(current_line) {
@@ -231,7 +216,7 @@ impl View {
 
     /// Translates a screen position to position in the text document.
     /// Returns a usize typed position in bounds of the text if found in this view, None if out of view.
-    pub fn pos_at_screen_coords(&self, doc: &Document, row: usize, column: usize) -> Option<usize> {
+    pub fn pos_at_screen_coords(&self, doc: &Document, row: u16, column: u16) -> Option<usize> {
         self.text_pos_at_screen_coords(&doc.text().slice(..), row, column, doc.tab_width())
     }
     // pub fn traverse<F>(&self, text: RopeSlice, start: usize, end: usize, fun: F)