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Implement vertical cursor movement

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This commit is contained in:
Kovid Goyal 2022-10-17 08:16:22 +05:30
parent 5509673ff3
commit 00ef9c1955
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 20 additions and 10 deletions
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30
tools/tui/readline/actions.go
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@ -162,22 +162,32 @@ func (self *Readline) move_cursor_right(amt uint, traverse_line_breaks bool) uin
return amt_moved
}
func move_up_one_line(self *Readline) bool {
return false
func (self *Readline) move_cursor_to_target_line(source_line, target_line *ScreenLine) {
if source_line != target_line {
visual_distance_into_text := source_line.CursorCell - source_line.PromptLen
self.cursor.Y = target_line.ParentLineNumber
tp := wcswidth.TruncateToVisualLength(target_line.Text, visual_distance_into_text)
self.cursor.X = target_line.OffsetInParentLine + len(tp)
}
}
func (self *Readline) move_cursor_up(amt uint) uint {
ans := uint(0)
func (self *Readline) move_cursor_vertically(amt int) (ans int) {
if self.screen_width == 0 {
self.update_current_screen_size()
}
for ans < amt {
if move_up_one_line(self) {
ans++
} else {
screen_lines := self.get_screen_lines()
cursor_line_num := 0
for i, sl := range screen_lines {
if sl.CursorCell > -1 {
cursor_line_num = i
break
}
}
target_line_num := (cursor_line_num + amt + len(screen_lines)) % len(screen_lines)
ans = target_line_num - cursor_line_num
if ans != 0 {
self.move_cursor_to_target_line(screen_lines[cursor_line_num], screen_lines[target_line_num])
}
return ans
}
@ -334,11 +344,11 @@ func (self *Readline) perform_action(ac Action, repeat_count uint) error {
case ActionAcceptInput:
return ErrAcceptInput
case ActionCursorUp:
if self.move_cursor_up(repeat_count) > 0 {
if self.move_cursor_vertically(-int(repeat_count)) != 0 {
return nil
}
case ActionCursorDown:
if self.move_cursor_down(repeat_count) > 0 {
if self.move_cursor_vertically(int(repeat_count)) != 0 {
return nil
}
case ActionHistoryPreviousOrCursorUp: