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Fixed a cursor bug

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This commit is contained in:
Luke I. Wilson
2021-03-13 17:37:00 -06:00
parent bf09ab03fe
commit ea492bfa04
1 changed files with 25 additions and 9 deletions
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34
ui/textedit.go
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@ -9,6 +9,13 @@ import (
"github.com/gdamore/tcell/v2"
)
// A Selection represents a region of the buffer to be selected for text editing
// purposes. It is asserted that the start position is less than the end position.
type Selection struct {
StartLine, StartCol int
EndLine, EndCol int
}
// TextEdit is a field for line-based editing. It features syntax highlighting
// tools, is autocomplete ready, and contains the various information about
// content being edited.
@ -217,11 +224,8 @@ func (t *TextEdit) getTabOffsetInLineAtCol(idx, col int) int {
return 0
}
// SetLineCol sets the cursor line and column position. Zero is origin for both.
// If `line` is out of bounds, `line` will be clamped to the closest available line.
// If `col` is out of bounds, `col` will be clamped to the closest column available for the line.
// Will scroll the TextEdit just enough to see the line the cursor is at.
func (t *TextEdit) SetLineCol(line, col int) {
// clampLineCol clamps the line and col inputs to only valid values within the buffer.
func (t *TextEdit) clampLineCol(line, col int) (int, int) {
// Clamp the line input
if line < 0 {
line = 0
@ -238,6 +242,16 @@ func (t *TextEdit) SetLineCol(line, col int) {
col = len
}
return line, col
}
// SetLineCol sets the cursor line and column position. Zero is origin for both.
// If `line` is out of bounds, `line` will be clamped to the closest available line.
// If `col` is out of bounds, `col` will be clamped to the closest column available for the line.
// Will scroll the TextEdit just enough to see the line the cursor is at.
func (t *TextEdit) SetLineCol(line, col int) {
line, col = t.clampLineCol(line, col)
// Handle hard tabs
tabOffset := t.getTabOffsetInLineAtCol(line, col) // Offset for the current line from hard tabs (temporary; purely visual)
@ -268,8 +282,9 @@ func (t *TextEdit) CursorUp() {
if t.cury <= 0 { // If the cursor is at the first line...
t.SetLineCol(t.cury, 0) // Go to beginning
} else {
tabOffset := t.getTabOffsetInLineAtCol(t.cury-1, t.prevCurCol)
t.SetLineCol(t.cury-1, t.prevCurCol-tabOffset)
line, col := t.clampLineCol(t.cury-1, t.prevCurCol)
tabOffset := t.getTabOffsetInLineAtCol(line, col)
t.SetLineCol(line, col-tabOffset)
}
}
@ -278,8 +293,9 @@ func (t *TextEdit) CursorDown() {
if t.cury >= len(t.buffer)-1 { // If the cursor is at the last line...
t.SetLineCol(t.cury, len(t.buffer[t.cury])) // Go to end of current line
} else {
tabOffset := t.getTabOffsetInLineAtCol(t.cury+1, t.prevCurCol)
t.SetLineCol(t.cury+1, t.prevCurCol-tabOffset) // Go to line below
line, col := t.clampLineCol(t.cury+1, t.prevCurCol)
tabOffset := t.getTabOffsetInLineAtCol(line, col)
t.SetLineCol(line, col-tabOffset) // Go to line below
}
}