channel list scrolling

1 files changed, 43 insertions, 0 deletions

diff --git a/tui/scroll_state.go b/tui/scroll_state.go
new file mode 100644
index 0000000..75797b1
--- /dev/null
+++ b/tui/scroll_state.go
@@ -0,0 +1,43 @@
+package tui
+
+type ScrollState struct {
+	at string
+	offset int
+	absolute int
+	atFirst bool
+	atLast bool
+}
+
+func (s *ScrollState) ToStart() {
+	*s = ScrollState {}
+}
+
+func (s *ScrollState) AtFirst() bool {
+	return s.atFirst
+}
+
+func (s *ScrollState) AtLast() bool {
+	return s.atLast
+}
+
+func (s *ScrollState) Scroll(amnt int) {
+	s.offset += amnt
+	s.absolute += amnt
+}
+
+func (s *ScrollState) ByMouse(ev MouseEvent, reverse bool) {
+	scroll := ev.Scroll * 5
+	if reverse {
+		scroll *= -1
+	}
+	s.Scroll(scroll)
+}
+
+func (s *ScrollState) Get() int {
+	return s.absolute
+}
+
+func (s *ScrollState) Set(amnt int) {
+	s.at = ""
+	s.absolute = amnt
+}