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Refactor handling of mouse events (#2893)

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- Simplified match statements by destructuring MouseEvent struct
  at the top and then matching on event.kind.
- Extracted out closures for calculating (1) position and view
  of mouse click and (2) gutter coordinates and view of mouse click.
This commit is contained in:
Gokul Soumya 2022-06-27 21:35:07 +05:30 committed by GitHub
parent 23ce5f1837
commit 3108a11d35
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 38 additions and 69 deletions
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107
helix-term/src/ui/editor.rs
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@ -1051,22 +1051,33 @@ fn handle_mouse_event(
cxt: &mut commands::Context,
) -> EventResult {
let config = cxt.editor.config();
match event {
MouseEvent {
kind: MouseEventKind::Down(MouseButton::Left),
row,
column,
modifiers,
..
} => {
let MouseEvent {
kind,
row,
column,
modifiers,
..
} = event;
let pos_and_view = |editor: &Editor, row, column| {
editor.tree.views().find_map(|(view, _focus)| {
view.pos_at_screen_coords(&editor.documents[&view.doc], row, column)
.map(|pos| (pos, view.id))
})
};
let gutter_coords_and_view = |editor: &Editor, row, column| {
editor.tree.views().find_map(|(view, _focus)| {
view.gutter_coords_at_screen_coords(row, column)
.map(|coords| (coords, view.id))
})
};
match kind {
MouseEventKind::Down(MouseButton::Left) => {
let editor = &mut cxt.editor;
let result = editor.tree.views().find_map(|(view, _focus)| {
view.pos_at_screen_coords(&editor.documents[&view.doc], row, column)
.map(|pos| (pos, view.id))
});
if let Some((pos, view_id)) = result {
if let Some((pos, view_id)) = pos_and_view(editor, row, column) {
let doc = editor.document_mut(editor.tree.get(view_id).doc).unwrap();
if modifiers == crossterm::event::KeyModifiers::ALT {
@ -1081,12 +1092,7 @@ fn handle_mouse_event(
return EventResult::Consumed(None);
}
let result = editor.tree.views().find_map(|(view, _focus)| {
view.gutter_coords_at_screen_coords(row, column)
.map(|coords| (coords, view.id))
});
if let Some((coords, view_id)) = result {
if let Some((coords, view_id)) = gutter_coords_and_view(editor, row, column) {
editor.tree.focus = view_id;
let view = editor.tree.get(view_id);
@ -1107,12 +1113,7 @@ fn handle_mouse_event(
EventResult::Ignored(None)
}
MouseEvent {
kind: MouseEventKind::Drag(MouseButton::Left),
row,
column,
..
} => {
MouseEventKind::Drag(MouseButton::Left) => {
let (view, doc) = current!(cxt.editor);
let pos = match view.pos_at_screen_coords(doc, row, column) {
@ -1124,15 +1125,11 @@ fn handle_mouse_event(
let primary = selection.primary_mut();
*primary = primary.put_cursor(doc.text().slice(..), pos, true);
doc.set_selection(view.id, selection);
EventResult::Consumed(None)
}
MouseEvent {
kind: MouseEventKind::ScrollUp | MouseEventKind::ScrollDown,
row,
column,
..
} => {
MouseEventKind::ScrollUp | MouseEventKind::ScrollDown => {
let current_view = cxt.editor.tree.focus;
let direction = match event.kind {
@ -1141,13 +1138,8 @@ fn handle_mouse_event(
_ => unreachable!(),
};
let result = cxt.editor.tree.views().find_map(|(view, _focus)| {
view.pos_at_screen_coords(&cxt.editor.documents[&view.doc], row, column)
.map(|_| view.id)
});
match result {
Some(view_id) => cxt.editor.tree.focus = view_id,
match pos_and_view(cxt.editor, row, column) {
Some((_, view_id)) => cxt.editor.tree.focus = view_id,
None => return EventResult::Ignored(None),
}
@ -1159,10 +1151,7 @@ fn handle_mouse_event(
EventResult::Consumed(None)
}
MouseEvent {
kind: MouseEventKind::Up(MouseButton::Left),
..
} => {
MouseEventKind::Up(MouseButton::Left) => {
if !config.middle_click_paste {
return EventResult::Ignored(None);
}
@ -1184,19 +1173,8 @@ fn handle_mouse_event(
EventResult::Consumed(None)
}
MouseEvent {
kind: MouseEventKind::Up(MouseButton::Right),
row,
column,
modifiers,
..
} => {
let result = cxt.editor.tree.views().find_map(|(view, _focus)| {
view.gutter_coords_at_screen_coords(row, column)
.map(|coords| (coords, view.id))
});
if let Some((coords, view_id)) = result {
MouseEventKind::Up(MouseButton::Right) => {
if let Some((coords, view_id)) = gutter_coords_and_view(cxt.editor, row, column) {
cxt.editor.tree.focus = view_id;
let view = cxt.editor.tree.get(view_id);
@ -1213,16 +1191,11 @@ fn handle_mouse_event(
return EventResult::Consumed(None);
}
}
EventResult::Ignored(None)
}
MouseEvent {
kind: MouseEventKind::Up(MouseButton::Middle),
row,
column,
modifiers,
..
} => {
MouseEventKind::Up(MouseButton::Middle) => {
let editor = &mut cxt.editor;
if !config.middle_click_paste {
return EventResult::Ignored(None);
@ -1235,16 +1208,12 @@ fn handle_mouse_event(
return EventResult::Consumed(None);
}
let result = editor.tree.views().find_map(|(view, _focus)| {
view.pos_at_screen_coords(&editor.documents[&view.doc], row, column)
.map(|pos| (pos, view.id))
});
if let Some((pos, view_id)) = result {
if let Some((pos, view_id)) = pos_and_view(editor, row, column) {
let doc = editor.document_mut(editor.tree.get(view_id).doc).unwrap();
doc.set_selection(view_id, Selection::point(pos));
editor.tree.focus = view_id;
commands::MappableCommand::paste_primary_clipboard_before.execute(cxt);
return EventResult::Consumed(None);
}