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Added horizontal scrolling in TextEdit

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This commit is contained in:
Luke I. Wilson 2021-03-11 22:24:39 -06:00
parent 314a50c385
commit a6674fb918
1 changed files with 22 additions and 5 deletions
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27
ui/textedit.go
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@ -239,10 +239,18 @@ func (t *TextEdit) SetLineCol(line, col int) {
t.scrolly = line
}
columnWidth := t.getColumnWidth()
// Scroll the screen horizontally when going to columns out of view
if col+tabOffset >= t.scrollx+(t.width-columnWidth-1) { // If the new column is right of view
t.scrollx = (col + tabOffset) - (t.width - columnWidth) + 1 // Scroll just enough to view that column
} else if col+tabOffset < t.scrollx { // If the new column is left of view
t.scrollx = col + tabOffset // Scroll left enough to view that column
}
t.cury, t.curx = line, col
if t.focused {
columnWidth := t.getColumnWidth()
(*t.screen).ShowCursor(t.x+columnWidth+col+tabOffset, t.y+line-t.scrolly)
(*t.screen).ShowCursor(t.x+columnWidth+col+tabOffset-t.scrollx, t.y+line-t.scrolly)
}
}
@ -317,7 +325,16 @@ func (t *TextEdit) Draw(s tcell.Screen) {
lineStr = t.buffer[line]
}
DrawStr(s, t.x+columnWidth, lineY, lineStr, textEditStyle) // Draw line
lineRunes := []rune(lineStr)
if len(lineRunes) >= t.scrollx { // If some of the line is visible at our horizontal scroll...
lineRunes = lineRunes[t.scrollx:] // Trim left side of string we cannot see
if len(lineRunes) >= t.width-columnWidth { // If that trimmed line continues out of view to the right...
lineRunes = lineRunes[:t.width-columnWidth] // Trim right side of string we cannot see
}
DrawStr(s, t.x+columnWidth, lineY, string(lineRunes), textEditStyle) // Draw line
}
}
columnStr := fmt.Sprintf("%s%s", strings.Repeat(" ", columnWidth-len(lineNumStr)), lineNumStr) // Right align line number
@ -388,9 +405,9 @@ func (t *TextEdit) HandleEvent(event tcell.Event) bool {
case tcell.KeyEnd:
t.SetLineCol(t.cury, len(t.buffer[t.cury]))
case tcell.KeyPgUp:
t.SetLineCol(t.scrolly - t.height, t.curx) // Go a page up
t.SetLineCol(t.scrolly-t.height, t.curx) // Go a page up
case tcell.KeyPgDn:
t.SetLineCol(t.scrolly + t.height*2 - 1, t.curx) // Go a page down
t.SetLineCol(t.scrolly+t.height*2-1, t.curx) // Go a page down
// Deleting
case tcell.KeyBackspace: