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Clear necessary lines before rendering

This commit is contained in:
Christian Rocha 2020-01-15 22:41:45 -05:00
parent 7c7c8f7c86
commit fe42b5c4a7
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GPG Key ID: D6CC7A16E5878018
2 changed files with 7 additions and 3 deletions
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2
examples/views/main.go
View File

@ -186,7 +186,7 @@ func chosenView(m Model) string {
label = fmt.Sprintf("Downloaded. Exiting in %d...", m.Ticks) label = fmt.Sprintf("Downloaded. Exiting in %d...", m.Ticks)
} }
return msg + "\n\n\n\n\n\n " + label + "\n" + progressbar(80, m.Progress) + "%" return msg + "\n\n " + label + "\n" + progressbar(80, m.Progress) + "%"
} }
func checkbox(label string, checked bool) string { func checkbox(label string, checked bool) string {

8
tea.go
View File

@ -11,6 +11,9 @@ import (
// Escape sequence // Escape sequence
const esc = "\033[" const esc = "\033["
// The number of lines we last rendered
var linesRendered = 0
// Msg represents an action. It's used by Update to update the UI. // Msg represents an action. It's used by Update to update the UI.
type Msg interface{} type Msg interface{}
@ -150,9 +153,10 @@ func (p *Program) render(model Model, init bool) {
view = strings.Replace(view, "\n", "\r\n", -1) view = strings.Replace(view, "\n", "\r\n", -1)
if !init { if !init {
clearLines(strings.Count(view, "\r\n")) clearLines(linesRendered)
} }
io.WriteString(p.rw, view) io.WriteString(p.rw, view)
linesRendered = strings.Count(view, "\r\n")
} }
// Hide the cursor // Hide the cursor
@ -178,8 +182,8 @@ func clearLine() {
// Clear a given number of lines // Clear a given number of lines
func clearLines(n int) { func clearLines(n int) {
for i := 0; i < n; i++ { for i := 0; i < n; i++ {
cursorUp(1)
clearLine() clearLine()
cursorUp(1)
} }
} }