Added "hide-summary-marker" DetailsView property

CHANGELOG.md

@@ -33,7 +33,7 @@
 * Added functions: NewBounds, NewEllipticRadius, NewRadii, NewLinearGradient, NewCircleRadialGradient,
 NewEllipseRadialGradient, GetPushTransform, GetPushDuration, GetPushTiming, IsMoveToFrontAnimation,
 GetBackground, GetMask, GetBackgroundClip,GetBackgroundOrigin, GetMaskClip, GetMaskOrigin, NewColumnSeparator,
-NewClipShapeProperty, NewTransitionAnimation, NewAnimation.
+NewClipShapeProperty, NewTransitionAnimation, NewAnimation, IsSummaryMarkerHidden.
 
 * Added SetConicGradientFillStyle and SetConicGradientStrokeStyle methods to Canvas interface.
 
@@ -49,6 +49,8 @@ NewClipShapeProperty, NewTransitionAnimation, NewAnimation.
 
 * Added "mask", "mask-clip", "mask-origin", and "background-origin" properties.
 
+* Added "hide-summary-marker" DetailsView property.
+
 * Added LineJoin type. Type of constants MiterJoin, RoundJoin, and BevelJoin changed to LineJoin. Type of Canvas.SetLineJoin function argument changed to LineJoin.
 
 * Added LineCap type. Type of constants ButtCap, RoundCap, and SquareCap changed to LineCap. Type of Canvas.SetLineCap function argument changed to LineCap.

README-ru.md

@@ -2980,13 +2980,14 @@ DetailsView переключается между состояниями по к
 "expanded" (константа Expanded). Соответственно значение "true" показывает дочерние
 View, "false" - скрывает.
 
-Получить значение свойства "expanded" можно с помощью функции
+По умолчанию в начале элемента "summary" отображается маркер ▶︎/▼. Его можно спрятать.
+Для этого используется свойство "hide-summary-marker" (константа DetailsView) типа bool.
 
-	func IsDetailsExpanded(view View, subviewID ...string) bool
-
-а значение свойства "summary" можно получить с помощью функции
+Получить значение свойств "summary", "expanded" и "hide-summary-marker" можно с помощью функций
 
 	func GetDetailsSummary(view View, subviewID ...string) View
+	func IsDetailsExpanded(view View, subviewID ...string) bool
+	func IsSummaryMarkerHidden(view View, subviewID ...string) bool
 
 ## Resizable
 

README.md

@@ -2963,13 +2963,14 @@ DetailsView switches between states by clicking on "summary" view.
 For forced switching of the DetailsView states, the bool property "expanded" (Expanded constant) is used. 
 Accordingly, the value "true" shows child Views, "false" - hides.
 
-You can get the value of the "expanded" property using the function
+By default, a ▶︎/▼ marker is displayed at the beginning of the "summary" element. It can be hidden.
+For this, the "hide-summary-marker" bool property (DetailsView constant) is used.
 
-	func IsDetailsExpanded(view View, subviewID ...string) bool
-
-and the value of the "summary" property can be obtained using the function
+The value of the "summary", "expanded" and "hide-summary-marker" properties can be obtained using the functions
 
 	func GetDetailsSummary(view View, subviewID ...string) View
+	func IsDetailsExpanded(view View, subviewID ...string) bool
+	func IsSummaryMarkerHidden(view View, subviewID ...string) bool
 
 ## Resizable
 

app_styles.css

@@ -181,6 +181,14 @@ ul:focus {
   overflow: auto;
 }
 
+.hiddenMarker {
+  list-style: none;
+}
+
+.hiddenMarker::-webkit-details-marker {
+  display: none;
+}
+
 /*
 @media (prefers-color-scheme: light) {
   body {

detailsView.go

@@ -25,6 +25,18 @@ const (
 	//   - true, 1, "true", "yes", "on", or "1" - Content is visible.
 	//   - false, 0, "false", "no", "off", or "0" - Content is collapsed (hidden).
 	Expanded PropertyName = "expanded"
+
+	// HideSummaryMarker is the constant for "hide-summary-marker" property tag.
+	//
+	// Used by DetailsView.
+	// Allows you to hide the summary marker (▶︎). Default value is false.
+	//
+	// Supported types: bool, int, string.
+	//
+	// Values:
+	//   - true, 1, "true", "yes", "on", or "1" - The summary marker is hidden.
+	//   - false, 0, "false", "no", "off", or "0" - The summary marker is displayed (default value).
+	HideSummaryMarker PropertyName = "hide-summary-marker"
 )
 
 // DetailsView represent a DetailsView view, which is a collapsible container of views
@@ -99,7 +111,7 @@ func (detailsView *detailsViewData) setFunc(tag PropertyName, value any) []Prope
 
 func (detailsView *detailsViewData) propertyChanged(tag PropertyName) {
 	switch tag {
-	case Summary:
+	case Summary, HideSummaryMarker:
 		updateInnerHTML(detailsView.htmlID(), detailsView.Session())
 
 	case Expanded:
@@ -130,24 +142,46 @@ func (detailsView *detailsViewData) htmlProperties(self View, buffer *strings.Bu
 }
 
 func (detailsView *detailsViewData) htmlSubviews(self View, buffer *strings.Builder) {
+	summary := false
+	hidden := IsSummaryMarkerHidden(detailsView)
+
 	if value, ok := detailsView.properties[Summary]; ok {
+
 		switch value := value.(type) {
 		case string:
 			if !GetNotTranslate(detailsView) {
 				value, _ = detailsView.session.GetString(value)
 			}
-			buffer.WriteString("<summary>")
+			if hidden {
+				buffer.WriteString(`<summary class="hiddenMarker">`)
+			} else {
+				buffer.WriteString("<summary>")
+			}
 			buffer.WriteString(value)
 			buffer.WriteString("</summary>")
+			summary = true
 
 		case View:
-			if value.htmlTag() == "div" {
+			if hidden {
+				buffer.WriteString(`<summary class="hiddenMarker">`)
+				viewHTML(value, buffer, "")
+				buffer.WriteString("</summary>")
+			} else if value.htmlTag() == "div" {
 				viewHTML(value, buffer, "summary")
 			} else {
 				buffer.WriteString(`<summary><div style="display: inline-block;">`)
 				viewHTML(value, buffer, "")
 				buffer.WriteString("</div></summary>")
 			}
+			summary = true
+		}
+	}
+
+	if !summary {
+		if hidden {
+			buffer.WriteString(`<summary class="hiddenMarker"></summary>`)
+		} else {
+			buffer.WriteString("<summary></summary>")
 		}
 	}
 
@@ -189,3 +223,9 @@ func GetDetailsSummary(view View, subviewID ...string) View {
 func IsDetailsExpanded(view View, subviewID ...string) bool {
 	return boolStyledProperty(view, subviewID, Expanded, false)
 }
+
+// IsDetailsExpanded returns a value of the HideSummaryMarker property of DetailsView.
+// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
+func IsSummaryMarkerHidden(view View, subviewID ...string) bool {
+	return boolStyledProperty(view, subviewID, HideSummaryMarker, false)
+}

propertySet.go

@@ -63,6 +63,7 @@ var boolProperties = []PropertyName{
 	UserSelect,
 	ColumnSpanAll,
 	MoveToFrontAnimation,
+	HideSummaryMarker,
 }
 
 var intProperties = []PropertyName{