From 03bdc867bee4ce7355079090c396d9ec861fc4bb Mon Sep 17 00:00:00 2001
From: Oliver <480930+rivo@users.noreply.github.com>
Date: Wed, 3 Apr 2024 15:46:31 +0200
Subject: [PATCH] Fixed inconsistent selection styles in List, bugfixes in
 printWithStyle, removed reliance on ColorDefault. Fixes #954, resolves #960

---
 dropdown.go   |  5 ++--
 inputfield.go |  6 ++---
 list.go       | 75 +++++++++++++++++----------------------------------
 strings.go    |  2 +-
 util.go       | 15 +++++------
 5 files changed, 37 insertions(+), 66 deletions(-)

diff --git a/dropdown.go b/dropdown.go
index a67761d..11400ed 100644
--- a/dropdown.go
+++ b/dropdown.go
@@ -91,9 +91,8 @@ type DropDown struct {
 func NewDropDown() *DropDown {
 	list := NewList()
 	list.ShowSecondaryText(false).
-		SetMainTextColor(Styles.PrimitiveBackgroundColor).
-		SetSelectedTextColor(Styles.PrimitiveBackgroundColor).
-		SetSelectedBackgroundColor(Styles.PrimaryTextColor).
+		SetMainTextStyle(tcell.StyleDefault.Background(Styles.MoreContrastBackgroundColor).Foreground(Styles.PrimitiveBackgroundColor)).
+		SetSelectedStyle(tcell.StyleDefault.Background(Styles.PrimaryTextColor).Foreground(Styles.PrimitiveBackgroundColor)).
 		SetHighlightFullLine(true).
 		SetBackgroundColor(Styles.MoreContrastBackgroundColor)
 
diff --git a/inputfield.go b/inputfield.go
index 6a6ec1e..27b74bc 100644
--- a/inputfield.go
+++ b/inputfield.go
@@ -138,7 +138,7 @@ func NewInputField() *InputField {
 	})
 	i.textArea.textStyle = tcell.StyleDefault.Background(Styles.ContrastBackgroundColor).Foreground(Styles.PrimaryTextColor)
 	i.textArea.placeholderStyle = tcell.StyleDefault.Background(Styles.ContrastBackgroundColor).Foreground(Styles.ContrastSecondaryTextColor)
-	i.autocompleteStyles.main = tcell.StyleDefault.Foreground(Styles.PrimitiveBackgroundColor)
+	i.autocompleteStyles.main = tcell.StyleDefault.Background(Styles.MoreContrastBackgroundColor).Foreground(Styles.PrimitiveBackgroundColor)
 	i.autocompleteStyles.selected = tcell.StyleDefault.Background(Styles.PrimaryTextColor).Foreground(Styles.PrimitiveBackgroundColor)
 	i.autocompleteStyles.background = Styles.MoreContrastBackgroundColor
 	return i
@@ -242,8 +242,8 @@ func (i *InputField) GetPlaceholderStyle() tcell.Style {
 }
 
 // SetAutocompleteStyles sets the colors and style of the autocomplete entries.
-// For details, see List.SetMainTextStyle(), List.SetSelectedStyle(), and
-// Box.SetBackgroundColor().
+// For details, see [List.SetMainTextStyle], [List.SetSelectedStyle], and
+// [Box.SetBackgroundColor].
 func (i *InputField) SetAutocompleteStyles(background tcell.Color, main, selected tcell.Style) *InputField {
 	i.autocompleteStyles.background = background
 	i.autocompleteStyles.main = main
diff --git a/list.go b/list.go
index 8e59fe9..2271926 100644
--- a/list.go
+++ b/list.go
@@ -76,11 +76,6 @@ type List struct {
 	// are not affected.
 	horizontalOffset int
 
-	// Set to true if a currently visible item flows over the right border of
-	// the box. This is set by the Draw() function. It determines the behaviour
-	// of the right arrow key.
-	overflowing bool
-
 	// An optional function which is called when the user has navigated to a
 	// list item.
 	changed func(index int, mainText, secondaryText string, shortcut rune)
@@ -99,9 +94,9 @@ func NewList() *List {
 		Box:                NewBox(),
 		showSecondaryText:  true,
 		wrapAround:         true,
-		mainTextStyle:      tcell.StyleDefault.Foreground(Styles.PrimaryTextColor),
-		secondaryTextStyle: tcell.StyleDefault.Foreground(Styles.TertiaryTextColor),
-		shortcutStyle:      tcell.StyleDefault.Foreground(Styles.SecondaryTextColor),
+		mainTextStyle:      tcell.StyleDefault.Foreground(Styles.PrimaryTextColor).Background(Styles.PrimitiveBackgroundColor),
+		secondaryTextStyle: tcell.StyleDefault.Foreground(Styles.TertiaryTextColor).Background(Styles.PrimitiveBackgroundColor),
+		shortcutStyle:      tcell.StyleDefault.Foreground(Styles.SecondaryTextColor).Background(Styles.PrimitiveBackgroundColor),
 		selectedStyle:      tcell.StyleDefault.Foreground(Styles.PrimitiveBackgroundColor).Background(Styles.PrimaryTextColor),
 	}
 }
@@ -495,10 +490,7 @@ func (l *List) Draw(screen tcell.Screen) {
 	}
 
 	// Draw the list items.
-	var (
-		maxWidth    int  // The maximum printed item width.
-		overflowing bool // Whether a text's end exceeds the right border.
-	)
+	var maxWidth int // The maximum printed item width.
 	for index, item := range l.items {
 		if index < l.itemOffset {
 			continue
@@ -510,54 +502,38 @@ func (l *List) Draw(screen tcell.Screen) {
 
 		// Shortcuts.
 		if showShortcuts && item.Shortcut != 0 {
-			printWithStyle(screen, fmt.Sprintf("(%s)", string(item.Shortcut)), x-5, y, 0, 4, AlignRight, l.shortcutStyle, true)
+			printWithStyle(screen, fmt.Sprintf("(%s)", string(item.Shortcut)), x-5, y, 0, 4, AlignRight, l.shortcutStyle, false)
 		}
 
 		// Main text.
-		_, end, printedWidth := printWithStyle(screen, item.MainText, x, y, l.horizontalOffset, width, AlignLeft, l.mainTextStyle, true)
+		selected := index == l.currentItem && (!l.selectedFocusOnly || l.HasFocus())
+		style := l.mainTextStyle
+		if selected {
+			style = l.selectedStyle
+		}
+		_, _, printedWidth := printWithStyle(screen, item.MainText, x, y, l.horizontalOffset, width, AlignLeft, style, false)
 		if printedWidth > maxWidth {
 			maxWidth = printedWidth
 		}
-		if end < len(item.MainText) {
-			overflowing = true
-		}
 
-		// Background color of selected text.
-		if index == l.currentItem && (!l.selectedFocusOnly || l.HasFocus()) {
-			textWidth := width
-			if !l.highlightFullLine {
-				if w := TaggedStringWidth(item.MainText); w < textWidth {
-					textWidth = w
-				}
-			}
-
-			mainTextColor, _, _ := l.mainTextStyle.Decompose()
-			for bx := 0; bx < textWidth; bx++ {
-				m, c, style, _ := screen.GetContent(x+bx, y)
-				fg, _, _ := style.Decompose()
-				style = l.selectedStyle
-				if fg != mainTextColor {
-					style = style.Foreground(fg)
-				}
-				screen.SetContent(x+bx, y, m, c, style)
+		// Draw until the end of the line if requested.
+		if selected && l.highlightFullLine {
+			for bx := printedWidth; bx < width; bx++ {
+				screen.SetContent(x+bx, y, ' ', nil, style)
 			}
 		}
 
 		y++
-
 		if y >= bottomLimit {
 			break
 		}
 
 		// Secondary text.
 		if l.showSecondaryText {
-			_, end, printedWidth := printWithStyle(screen, item.SecondaryText, x, y, l.horizontalOffset, width, AlignLeft, l.secondaryTextStyle, true)
+			_, _, printedWidth := printWithStyle(screen, item.SecondaryText, x, y, l.horizontalOffset, width, AlignLeft, l.secondaryTextStyle, false)
 			if printedWidth > maxWidth {
 				maxWidth = printedWidth
 			}
-			if end < len(item.SecondaryText) {
-				overflowing = true
-			}
 			y++
 		}
 	}
@@ -569,7 +545,6 @@ func (l *List) Draw(screen tcell.Screen) {
 		l.horizontalOffset -= width - maxWidth
 		l.Draw(screen)
 	}
-	l.overflowing = overflowing
 }
 
 // adjustOffset adjusts the vertical offset to keep the current selection in
@@ -612,17 +587,9 @@ func (l *List) InputHandler() func(event *tcell.EventKey, setFocus func(p Primit
 		case tcell.KeyBacktab, tcell.KeyUp:
 			l.currentItem--
 		case tcell.KeyRight:
-			if l.overflowing {
-				l.horizontalOffset += 2 // We shift by 2 to account for two-cell characters.
-			} else {
-				l.currentItem++
-			}
+			l.horizontalOffset += 2 // We shift by 2 to account for two-cell characters.
 		case tcell.KeyLeft:
-			if l.horizontalOffset > 0 {
-				l.horizontalOffset -= 2
-			} else {
-				l.currentItem--
-			}
+			l.horizontalOffset -= 2
 		case tcell.KeyHome:
 			l.currentItem = 0
 		case tcell.KeyEnd:
@@ -762,6 +729,12 @@ func (l *List) MouseHandler() func(action MouseAction, event *tcell.EventMouse,
 				l.itemOffset++
 			}
 			consumed = true
+		case MouseScrollLeft:
+			l.horizontalOffset--
+			consumed = true
+		case MouseScrollRight:
+			l.horizontalOffset++
+			consumed = true
 		}
 
 		return
diff --git a/strings.go b/strings.go
index 08cbf7b..70bce60 100644
--- a/strings.go
+++ b/strings.go
@@ -92,7 +92,7 @@ func (s *stepState) Style() tcell.Style {
 // are the first grapheme cluster, the remaining string, and the new state. Pass
 // the remaining string and the returned state to the next call. If the rest
 // string is empty, parsing is complete. Call the returned state's methods for
-// boundary and width information.
+// boundary and cluster width information.
 //
 // The returned cluster may be empty if the given string consists of only
 // (parsed) tags. The boundary and width information will be meaningless in
diff --git a/util.go b/util.go
index 7a9d2d7..b275c8c 100644
--- a/util.go
+++ b/util.go
@@ -66,19 +66,18 @@ func printWithStyle(screen tcell.Screen, text string, x, y, skipWidth, maxWidth,
 	}
 
 	// Skip beginning and measure width.
-	var (
-		state     *stepState
-		textWidth int
-	)
+	var textWidth int
+	state := &stepState{
+		unisegState: -1,
+		style:       style,
+	}
 	str := text
 	for len(str) > 0 {
 		_, str, state = step(str, state, stepOptionsStyle)
 		if skipWidth > 0 {
 			skipWidth -= state.Width()
-			if skipWidth <= 0 {
-				text = str
-				style = state.Style()
-			}
+			text = str
+			style = state.Style()
 			start += state.GrossLength()
 		} else {
 			textWidth += state.Width()