refactor page/list movement

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

internal/ui/docs/update.go

@@ -4,6 +4,7 @@ import (
 	"charm.land/bubbles/v2/key"
 	tea "charm.land/bubbletea/v2"
 	"github.com/anotherhadi/spilltea/internal/keys"
+	"github.com/anotherhadi/spilltea/internal/util"
 )
 
 func (e Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
@@ -12,12 +13,7 @@ func (e Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	switch msg := msg.(type) {
 	case tea.MouseWheelMsg:
-		switch msg.Button {
-		case tea.MouseWheelUp:
-			e.viewport.SetYOffset(e.viewport.YOffset() - 1)
-		case tea.MouseWheelDown:
-			e.viewport.SetYOffset(e.viewport.YOffset() + 1)
-		}
+		util.HandleMouseWheel(msg, &e.viewport)
 
 	case tea.KeyPressMsg:
 		if e.searching {
@@ -61,17 +57,9 @@ func (e Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case key.Matches(msg, g.Down):
 			e.viewport.SetYOffset(e.viewport.YOffset() + 1)
 		case key.Matches(msg, g.ScrollUp):
-			step := e.viewport.Height() / 2
-			if step < 1 {
-				step = 1
-			}
-			e.viewport.SetYOffset(e.viewport.YOffset() - step)
+			util.ScrollViewport(&e.viewport, -1)
 		case key.Matches(msg, g.ScrollDown):
-			step := e.viewport.Height() / 2
-			if step < 1 {
-				step = 1
-			}
-			e.viewport.SetYOffset(e.viewport.YOffset() + step)
+			util.ScrollViewport(&e.viewport, 1)
 		case key.Matches(msg, g.Help):
 			e.help.ShowAll = !e.help.ShowAll
 			e.SetSize(e.width, e.height)