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examples: text editor: implement ctrl+arrows to move by word (#6838)

pull/6841/head
spaceface777 2020-11-15 13:33:08 +01:00 committed by GitHub
parent f995aa35ea
commit dcbb285ae4
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1 changed files with 37 additions and 2 deletions
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35
examples/term.ui/text_editor.v
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@ -359,6 +359,33 @@ fn (mut b Buffer) move_cursor(amount int, movement Movement) {
}
}
fn (mut b Buffer) move_to_word(movement Movement) {
a := if movement == .left { -1 } else { 1 }
mut line := b.cur_line()
mut x, mut y := b.cursor.pos_x, b.cursor.pos_y
if x + a < 0 && y > 0 {
y--
line = b.line(b.cursor.pos_y - 1)
x = line.len
} else if x + a >= line.len && y + 1 < b.lines.len {
y++
line = b.line(b.cursor.pos_y + 1)
x = 0
}
// first, move past all non-`a-zA-Z0-9_` characters
for x+a >= 0 && x+a < line.len && !(line[x+a].is_letter() || line[x+a].is_digit() || line[x+a] == `_`) { x += a }
// then, move past all the letters and numbers
for x+a >= 0 && x+a < line.len && (line[x+a].is_letter() || line[x+a].is_digit() || line[x+a] == `_`) { x += a }
// if the cursor is out of bounds, move it to the next/previous line
if x + a >= 0 && x + a < line.len {
x += a
} else if a < 0 && y+1 > b.lines.len && y-1 >= 0 {
y += a
x = 0
}
b.cursor.set(x, y)
}
fn imax(x int, y int) int {
return if x < y { y } else { x }
}
@ -462,11 +489,19 @@ fn event(e &tui.Event, x voidptr) {
buffer.del(1)
}
.left {
if e.modifiers == tui.ctrl {
buffer.move_to_word(.left)
} else if e.modifiers == 0 {
buffer.move_cursor(1, .left)
}
}
.right {
if e.modifiers == tui.ctrl {
buffer.move_to_word(.right)
} else if e.modifiers == 0 {
buffer.move_cursor(1, .right)
}
}
.up {
buffer.move_cursor(1, .up)
}