Optimisation

angleUnit.go

@@ -1,6 +1,7 @@
 package rui
 
 import (
+	"errors"
 	"fmt"
 	"math"
 	"strconv"
@@ -86,6 +87,10 @@ func StringToAngleUnit(value string) (AngleUnit, bool) {
 func stringToAngleUnit(value string) (AngleUnit, error) {
 	value = strings.ToLower(strings.Trim(value, " \t\n\r"))
 
+	if value == "" {
+		return AngleUnit{}, errors.New(`invalid AngleUnit value: ""`)
+	}
+
 	setValue := func(suffix string, unitType AngleUnitType) (AngleUnit, error) {
 		val, err := strconv.ParseFloat(value[:len(value)-len(suffix)], 64)
 		if err != nil {

backgroundConicGradient.go

@@ -65,17 +65,13 @@ func (point *BackgroundGradientAngle) color(session Session) (Color, bool) {
 	if point.Color != nil {
 		switch color := point.Color.(type) {
 		case string:
-			if color != "" {
+			if ok, constName := isConstantName(color); ok {
-				if color[0] == '@' {
+				if clr, ok := session.Color(constName); ok {
-					if clr, ok := session.Color(color[1:]); ok {
 					return clr, true
 				}
-				} else {
+			} else if clr, ok := StringToColor(color); ok {
-					if clr, ok := StringToColor(color); ok {
 				return clr, true
 			}
-				}
-			}
 
 		case Color:
 			return color, true
@@ -104,11 +100,8 @@ func (point *BackgroundGradientAngle) cssString(session Session, buffer *strings
 	if point.Angle != nil {
 		switch value := point.Angle.(type) {
 		case string:
-			if value != "" {
+			if ok, constName := isConstantName(value); ok {
-				if value[0] == '@' {
+				if value, ok = session.Constant(constName); !ok {
-					if val, ok := session.Constant(value[1:]); ok {
-						value = val
-					} else {
 					return
 				}
 			}
@@ -117,7 +110,6 @@ func (point *BackgroundGradientAngle) cssString(session Session, buffer *strings
 				buffer.WriteRune(' ')
 				buffer.WriteString(angle.cssString())
 			}
-			}
 
 		case AngleUnit:
 			buffer.WriteRune(' ')
@@ -174,7 +166,7 @@ func backgroundConicGradientSet(properties Properties, tag PropertyName, value a
 					properties.setRaw(Gradient, vector)
 					return []PropertyName{tag}
 				}
-			} else if isConstantName(value) {
+			} else if ok, _ := isConstantName(value); ok {
 				properties.setRaw(Gradient, value)
 				return []PropertyName{tag}
 			}
@@ -206,15 +198,6 @@ func backgroundConicGradientSet(properties Properties, tag PropertyName, value a
 	return propertiesSet(properties, tag, value)
 }
 
-func (gradient *backgroundConicGradient) stringToAngle(text string) (any, bool) {
-	if text == "" {
-		return nil, false
-	} else if text[0] == '@' {
-		return text, true
-	}
-	return StringToAngleUnit(text)
-}
-
 func (gradient *backgroundConicGradient) stringToGradientPoint(text string) (BackgroundGradientAngle, bool) {
 	var result BackgroundGradientAngle
 	colorText := ""
@@ -231,7 +214,7 @@ func (gradient *backgroundConicGradient) stringToGradientPoint(text string) (Bac
 		return result, false
 	}
 
-	if colorText[0] == '@' {
+	if ok, _ := isConstantName(colorText); ok {
 		result.Color = colorText
 	} else if color, ok := StringToColor(colorText); ok {
 		result.Color = color
@@ -240,7 +223,9 @@ func (gradient *backgroundConicGradient) stringToGradientPoint(text string) (Bac
 	}
 
 	if pointText != "" {
-		if angle, ok := gradient.stringToAngle(pointText); ok {
+		if ok, _ := isConstantName(pointText); ok {
+			result.Angle = pointText
+		} else if angle, ok := StringToAngleUnit(text); ok {
 			result.Angle = angle
 		} else {
 			return result, false

backgroundLinearGradient.go

@@ -103,14 +103,14 @@ func backgroundGradientSet(properties Properties, tag PropertyName, value any) [
 	case Gradient:
 		switch value := value.(type) {
 		case string:
-			if value != "" {
+			if ok, _ := isConstantName(value); ok {
-				if strings.Contains(value, " ") || strings.Contains(value, ",") {
+				properties.setRaw(Gradient, value)
-					if points := parseGradientText(value); len(points) >= 2 {
-						properties.setRaw(Gradient, points)
 				return []PropertyName{tag}
 			}
-				} else if value[0] == '@' {
+
-					properties.setRaw(Gradient, value)
+			if strings.ContainsAny(value, " ,") {
+				if points := parseGradientText(value); len(points) >= 2 {
+					properties.setRaw(Gradient, points)
 					return []PropertyName{tag}
 				}
 			}
@@ -168,7 +168,7 @@ func (point *BackgroundGradientPoint) setValue(text string) bool {
 		return false
 	}
 
-	if colorText[0] == '@' {
+	if ok, _ := isConstantName(colorText); ok {
 		point.Color = colorText
 	} else if color, ok := StringToColor(colorText); ok {
 		point.Color = color
@@ -178,7 +178,7 @@ func (point *BackgroundGradientPoint) setValue(text string) bool {
 
 	if pointText == "" {
 		point.Pos = nil
-	} else if pointText[0] == '@' {
+	} else if ok, _ := isConstantName(pointText); ok {
 		point.Pos = pointText
 	} else if pos, ok := StringToSizeUnit(pointText); ok {
 		point.Pos = pos
@@ -193,17 +193,10 @@ func (point *BackgroundGradientPoint) color(session Session) (Color, bool) {
 	if point.Color != nil {
 		switch color := point.Color.(type) {
 		case string:
-			if color != "" {
+			if ok, constName := isConstantName(color); ok {
-				if color[0] == '@' {
+				return session.Color(constName)
-					if clr, ok := session.Color(color[1:]); ok {
-						return clr, true
-					}
-				} else {
-					if clr, ok := StringToColor(color); ok {
-						return clr, true
-					}
-				}
 			}
+			return StringToColor(color)
 
 		case Color:
 			return color, true
@@ -256,8 +249,8 @@ func (gradient *backgroundGradient) writeGradient(session Session, buffer *strin
 
 	switch value := value.(type) {
 	case string:
-		if value != "" && value[0] == '@' {
+		if ok, constName := isConstantName(value); ok {
-			if text, ok := session.Constant(value[1:]); ok {
+			if text, ok := session.Constant(constName); ok {
 				points = parseGradientText(text)
 			}
 		}

clipShape.go

@@ -450,7 +450,7 @@ func polygonClipDataSet(properties Properties, tag PropertyName, value any) []Pr
 			for i, val := range value {
 				switch val := val.(type) {
 				case string:
-					if isConstantName(val) {
+					if ok, _ := isConstantName(val); ok {
 						points[i] = val
 					} else if size, ok := StringToSizeUnit(val); ok {
 						points[i] = size
@@ -484,7 +484,7 @@ func polygonClipDataSet(properties Properties, tag PropertyName, value any) []Pr
 			points := make([]any, len(values))
 			for i, val := range values {
 				val = strings.Trim(val, " \t\n\r")
-				if isConstantName(val) {
+				if ok, _ := isConstantName(val); ok {
 					points[i] = val
 				} else if size, ok := StringToSizeUnit(val); ok {
 					points[i] = size
@@ -634,7 +634,7 @@ func setClipShapePropertyProperty(properties Properties, tag PropertyName, value
 		return []PropertyName{tag}
 
 	case string:
-		if isConstantName(value) {
+		if ok, _ := isConstantName(value); ok {
 			properties.setRaw(tag, value)
 			return []PropertyName{tag}
 		}

colorPicker.go

@@ -159,9 +159,7 @@ func (picker *colorPickerData) handleCommand(self View, command PropertyName, da
 					for _, listener := range getTwoArgEventListeners[ColorPicker, Color](picker, nil, ColorChangedEvent) {
 						listener.Run(picker, color, oldColor)
 					}
-					if listener, ok := picker.changeListener[ColorPickerValue]; ok {
+					picker.runChangeListener(ColorPickerValue)
-						listener.Run(picker, ColorPickerValue)
-					}
 				}
 			}
 		}

datePicker.go

@@ -207,7 +207,7 @@ func (picker *datePickerData) setFunc(tag PropertyName, value any) []PropertyNam
 			return []PropertyName{tag}
 
 		case string:
-			if isConstantName(value) {
+			if ok, _ := isConstantName(value); ok {
 				picker.setRaw(tag, value)
 				return []PropertyName{tag}
 			}
@@ -351,9 +351,7 @@ func (picker *datePickerData) handleCommand(self View, command PropertyName, dat
 					for _, listener := range getTwoArgEventListeners[DatePicker, time.Time](picker, nil, DateChangedEvent) {
 						listener.Run(picker, value, oldValue)
 					}
-					if listener, ok := picker.changeListener[DatePickerValue]; ok {
+					picker.runChangeListener(DatePickerValue)
-						listener.Run(picker, DatePickerValue)
-					}
 				}
 			}
 		}

detailsView.go

@@ -192,9 +192,7 @@ func (detailsView *detailsViewData) handleCommand(self View, command PropertyNam
 	if command == "details-open" {
 		if n, ok := dataIntProperty(data, "open"); ok {
 			detailsView.properties[Expanded] = (n != 0)
-			if listener, ok := detailsView.changeListener[Expanded]; ok {
+			detailsView.runChangeListener(Expanded)
-				listener.Run(detailsView, Expanded)
-			}
 		}
 		return true
 	}

dragAndDrop.go

@@ -608,8 +608,8 @@ func GetDragImage(view View, subviewID ...string) string {
 		if value != nil {
 			if img, ok := value.(string); ok {
 				img = strings.Trim(img, " \t")
-				if img != "" && img[0] == '@' {
+				if ok, constName := isConstantName(img); ok {
-					if img, ok = view.Session().ImageConstant(img[1:]); ok {
+					if img, ok = view.Session().ImageConstant(constName); ok {
 						return img
 					}
 				} else {

dropDownList.go

@@ -139,7 +139,7 @@ func parseIndicesArray(value any) ([]any, bool) {
 			if val != nil {
 				switch val := val.(type) {
 				case string:
-					if isConstantName(val) {
+					if ok, _ := isConstantName(val); ok {
 						items = append(items, val)
 					} else if n, err := strconv.Atoi(val); err == nil {
 						items = append(items, n)
@@ -162,7 +162,7 @@ func parseIndicesArray(value any) ([]any, bool) {
 		items := make([]any, 0, len(value))
 		for _, str := range value {
 			if str = strings.Trim(str, " \t"); str != "" {
-				if isConstantName(str) {
+				if ok, _ := isConstantName(str); ok {
 					items = append(items, str)
 				} else if n, err := strconv.Atoi(str); err == nil {
 					items = append(items, n)
@@ -248,9 +248,7 @@ func (list *dropDownListData) handleCommand(self View, command PropertyName, dat
 					for _, listener := range getTwoArgEventListeners[DropDownList, int](list, nil, DropDownEvent) {
 						listener.Run(list, number, old)
 					}
-					if listener, ok := list.changeListener[Current]; ok {
+					list.runChangeListener(Current)
-						listener.Run(list, Current)
-					}
 				}
 			} else {
 				ErrorLog(err.Error())
@@ -308,8 +306,8 @@ func getIndicesArray(view View, tag PropertyName) []int {
 							result = append(result, value)
 
 						case string:
-							if value != "" && value[0] == '@' {
+							if ok, constName := isConstantName(value); ok {
-								if val, ok := view.Session().Constant(value[1:]); ok {
+								if val, ok := view.Session().Constant(constName); ok {
 									if n, err := strconv.Atoi(val); err == nil {
 										result = append(result, n)
 									}

editView.go

@@ -271,9 +271,7 @@ func (edit *editViewData) textChanged(newText, oldText string) {
 	for _, listener := range getTwoArgEventListeners[EditView, string](edit, nil, EditTextChangedEvent) {
 		listener.Run(edit, newText, oldText)
 	}
-	if listener, ok := edit.changeListener[Text]; ok {
+	edit.runChangeListener(Text)
-		listener.Run(edit, Text)
-	}
 }
 
 func (edit *editViewData) htmlTag() string {

gridLayout.go

@@ -150,7 +150,7 @@ func setGridCellSize(properties Properties, tag PropertyName, value any) []Prope
 			sizes := make([]any, count)
 			for i, val := range values {
 				val = strings.Trim(val, " \t\n\r")
-				if isConstantName(val) {
+				if ok, _ := isConstantName(val); ok {
 					sizes[i] = val
 				} else if fn := parseSizeFunc(val); fn != nil {
 					sizes[i] = SizeUnit{Type: SizeFunction, Function: fn}
@@ -162,7 +162,7 @@ func setGridCellSize(properties Properties, tag PropertyName, value any) []Prope
 				}
 			}
 			properties.setRaw(tag, sizes)
-		} else if isConstantName(values[0]) {
+		} else if ok, _ := isConstantName(values[0]); ok {
 			properties.setRaw(tag, values[0])
 		} else if size, err := stringToSizeUnit(values[0]); err == nil {
 			properties.setRaw(tag, size)
@@ -220,7 +220,7 @@ func setGridCellSize(properties Properties, tag PropertyName, value any) []Prope
 					sizes[i] = val
 
 				case string:
-					if isConstantName(val) {
+					if ok, _ := isConstantName(val); ok {
 						sizes[i] = val
 					} else if size, err := stringToSizeUnit(val); err == nil {
 						sizes[i] = size
@@ -458,7 +458,7 @@ func (gridLayout *gridLayoutData) UpdateGridContent() {
 		if gridLayout.created {
 			updateInnerHTML(gridLayout.htmlID(), gridLayout.session)
 		}
-		gridLayout.contentChanged()
+		gridLayout.runChangeListener(Content)
 	}
 }
 

image.go

@@ -143,8 +143,8 @@ func (manager *imageManager) imageLoadError(obj DataObject) {
 
 // LoadImage starts the async image loading by url
 func LoadImage(url string, onLoaded func(Image), session Session) Image {
-	if url != "" && url[0] == '@' {
+	if ok, constName := isConstantName(url); ok {
-		if image, ok := session.ImageConstant(url[1:]); ok {
+		if image, ok := session.ImageConstant(constName); ok {
 			url = image
 		}
 	}

imageView.go

@@ -217,11 +217,11 @@ func (imageView *imageViewData) htmlTag() string {
 }
 
 func imageViewSrc(view View, src string) (string, string) {
-	if src != "" && src[0] == '@' {
+	if ok, constName := isConstantName(src); ok {
-		if image, ok := view.Session().ImageConstant(src[1:]); ok {
+		if image, ok := view.Session().ImageConstant(constName); ok {
 			src = image
 		} else {
-			src = ""
+			return "", ""
 		}
 	}
 

listLayout.go

@@ -196,7 +196,7 @@ func (listLayout *listLayoutData) UpdateContent() {
 		if listLayout.created {
 			updateInnerHTML(listLayout.htmlID(), listLayout.session)
 		}
-		listLayout.contentChanged()
+		listLayout.runChangeListener(Content)
 	}
 }
 

listView.go

@@ -962,9 +962,7 @@ func (listView *listViewData) handleCurrent(number int) {
 	for _, listener := range getOneArgEventListeners[ListView, int](listView, nil, ListItemSelectedEvent) {
 		listener.Run(listView, number)
 	}
-	if listener, ok := listView.changeListener[Current]; ok {
+	listView.runChangeListener(Current)
-		listener.Run(listView, Current)
-	}
 }
 
 func (listView *listViewData) onItemClick(number int) {
@@ -1021,9 +1019,7 @@ func (listView *listViewData) onItemClick(number int) {
 		}
 
 		setArrayPropertyValue(listView, Checked, checkedItem)
-		if listener, ok := listView.changeListener[Checked]; ok {
+		listView.runChangeListener(Checked)
-			listener.Run(listView, Checked)
-		}
 
 		for _, listener := range getOneArgEventListeners[ListView, []int](listView, nil, ListItemCheckedEvent) {
 			listener.Run(listView, checkedItem)

numberPicker.go

@@ -283,9 +283,7 @@ func (picker *numberPickerData) handleCommand(self View, command PropertyName, d
 					for _, listener := range getTwoArgEventListeners[NumberPicker, float64](picker, nil, NumberChangedEvent) {
 						listener.Run(picker, value, oldValue)
 					}
-					if listener, ok := picker.changeListener[NumberPickerValue]; ok {
+					picker.runChangeListener(NumberPickerValue)
-						listener.Run(picker, NumberPickerValue)
-					}
 				}
 			}
 		}

popup.go

@@ -615,8 +615,8 @@ func (popup *popupData) Set(tag PropertyName, value any) bool {
 			popup.setRaw(Content, popup.contentView)
 
 		case string:
-			if len(value) > 0 && value[0] == '@' {
+			if ok, constName := isConstantName(value); ok {
-				view := CreateViewFromResources(popup.session, value[1:])
+				view := CreateViewFromResources(popup.session, constName)
 				if view != nil {
 					popup.contentView = view
 					break
@@ -1107,8 +1107,8 @@ func (popup *popupData) createTitleView() GridLayout {
 	if value := popup.getRaw(Title); value != nil {
 		switch value := value.(type) {
 		case string:
-			if len(value) > 0 && value[0] == '@' {
+			if ok, constName := isConstantName(value); ok {
-				title = CreateViewFromResources(session, value[1:])
+				title = CreateViewFromResources(session, constName)
 				if title != nil {
 					break
 				}

propertyGet.go

@@ -18,8 +18,8 @@ func stringProperty(properties Properties, tag PropertyName, session Session) (s
 func imageProperty(properties Properties, tag PropertyName, session Session) (string, bool) {
 	if value := properties.getRaw(tag); value != nil {
 		if text, ok := value.(string); ok {
-			if text != "" && text[0] == '@' {
+			if ok, constName := isConstantName(text); ok {
-				if image, ok := session.ImageConstant(text[1:]); ok {
+				if image, ok := session.ImageConstant(constName); ok {
 					return image, true
 				} else {
 					return "", false
@@ -88,8 +88,8 @@ func valueToColor(value any, session Session) (Color, bool) {
 			return value, true
 
 		case string:
-			if len(value) > 1 && value[0] == '@' {
+			if ok, constName := isConstantName(value); ok {
-				return session.Color(value[1:])
+				return session.Color(constName)
 			}
 			return StringToColor(value)
 		}

propertySet.go

@@ -511,10 +511,10 @@ func invalidPropertyValue(tag PropertyName, value any) {
 	ErrorLogF(`Invalid value "%v" of "%s" property`, value, string(tag))
 }
 
-func isConstantName(text string) bool {
+func isConstantName(text string) (bool, string) {
 	len := len(text)
 	if len <= 1 || text[0] != '@' {
-		return false
+		return false, ""
 	}
 
 	if len > 2 {
@@ -522,11 +522,14 @@ func isConstantName(text string) bool {
 		if (text[1] == '`' && text[last] == '`') ||
 			(text[1] == '"' && text[last] == '"') ||
 			(text[1] == '\'' && text[last] == '\'') {
-			return true
+			return true, text[2:last]
 		}
 	}
 
-	return !strings.ContainsAny(text, ",;|\"'`+(){}[]<>/\\*&%! \t\n\r")
+	if strings.ContainsAny(text, ",;|\"'`+(){}[]<>/\\*&%! \t\n\r") {
+		return false, ""
+	}
+	return true, text[1:]
 }
 
 func isInt(value any) (int, bool) {
@@ -579,7 +582,7 @@ func setSimpleProperty(properties Properties, tag PropertyName, value any) bool
 			properties.setRaw(tag, nil)
 			return true
 		}
-		if isConstantName(text) {
+		if ok, _ := isConstantName(text); ok {
 			properties.setRaw(tag, text)
 			return true
 		}

resizable.go

@@ -234,7 +234,7 @@ func resizableSetSide(properties Properties, value any) []PropertyName {
 				val := strings.Trim(val, " \t\r\n")
 				values[i] = val
 
-				if val[0] == '@' {
+				if ok, _ := isConstantName(val); ok {
 					hasConst = true
 				} else if n, err := strconv.Atoi(val); err == nil {
 					if n < 1 || n > AllSides {
@@ -262,7 +262,7 @@ func resizableSetSide(properties Properties, value any) []PropertyName {
 				return []PropertyName{Side}
 			}
 
-		} else if value[0] == '@' {
+		} else if ok, _ := isConstantName(value); ok {
 			properties.setRaw(Side, value)
 			return []PropertyName{Side}
 		} else if n, ok := validValues[value]; ok {

sizeFunc.go

@@ -130,7 +130,7 @@ func (data *sizeFuncData) parseArgs(args []any, allowNumber bool) bool {
 				return false
 			}
 
-			if arg[0] == '@' {
+			if ok, _ := isConstantName(arg); ok {
 				data.args = append(data.args, arg)
 			} else if val, err := strconv.ParseFloat(arg, 64); err == nil {
 				return numberArg(i, val)

stackLayout.go

@@ -377,7 +377,7 @@ func (layout *stackLayoutData) transitionFinished(view View, tag PropertyName) {
 					}
 				}
 				delete(layout.onPushFinished, viewID)
-				layout.contentChanged()
+				layout.runChangeListener(Content)
 			}
 
 		case "pop":
@@ -416,7 +416,7 @@ func (layout *stackLayoutData) transitionFinished(view View, tag PropertyName) {
 			session.removeProperty(pageID, "ontransitionend")
 			session.removeProperty(pageID, "ontransitioncancel")
 			session.finishUpdateScript(pageID)
-			layout.contentChanged()
+			layout.runChangeListener(Content)
 
 			if finished, ok := layout.onMoveFinished[viewID]; ok {
 				for _, listener := range finished.listener {
@@ -566,7 +566,7 @@ func (layout *stackLayoutData) moveToFrontByIndex(index int, onShow []func(View)
 	if transform == nil {
 		session.updateCSSProperty(peekPageID, "visibility", "hidden")
 		session.updateCSSProperty(pageID, "visibility", "visible")
-		layout.contentChanged()
+		layout.runChangeListener(Content)
 		for _, listener := range onShow {
 			if listener != nil {
 				listener(view)
@@ -677,7 +677,7 @@ func (layout *stackLayoutData) Append(view View) {
 		}
 		session.appendToInnerHTML(stackID, buffer.String())
 
-		layout.contentChanged()
+		layout.runChangeListener(Content)
 	}
 }
 
@@ -713,7 +713,7 @@ func (layout *stackLayoutData) Insert(view View, index int) {
 	session := layout.Session()
 	session.appendToInnerHTML(stackID, buffer.String())
 
-	layout.contentChanged()
+	layout.runChangeListener(Content)
 }
 
 // Remove removes view from list and return it
@@ -744,7 +744,7 @@ func (layout *stackLayoutData) RemoveView(index int) View {
 	}
 
 	layout.Session().callFunc("removeView", view.htmlID()+"page")
-	layout.contentChanged()
+	layout.runChangeListener(Content)
 	return view
 }
 
@@ -839,7 +839,7 @@ func (layout *stackLayoutData) Pop(onPopFinished ...func(View)) bool {
 	view.setParentID("")
 
 	layout.views = layout.views[:peek]
-	layout.contentChanged()
+	layout.runChangeListener(Content)
 
 	layout.onPopFinished[view.htmlID()] = popFinished{
 		view:     view,

tableView.go

@@ -695,7 +695,7 @@ func (table *tableViewData) setFunc(tag PropertyName, value any) []PropertyName
 	case HeadHeight, FootHeight:
 		switch value := value.(type) {
 		case string:
-			if isConstantName(value) {
+			if ok, _ := isConstantName(value); ok {
 				table.setRaw(tag, value)
 			} else if n, err := strconv.Atoi(value); err == nil {
 				table.setRaw(tag, n)
@@ -1675,13 +1675,10 @@ func (table *tableViewData) handleCommand(self View, command PropertyName, data
 		if row, ok := dataIntProperty(data, "row"); ok && row != current.Row {
 			current.Row = row
 			table.setRaw(Current, current.Row)
-			if listener, ok := table.changeListener[Current]; ok {
-				listener.Run(table, Current)
-			}
-
 			for _, listener := range getOneArgEventListeners[TableView, int](table, nil, TableRowSelectedEvent) {
 				listener.Run(table, row)
 			}
+			table.runChangeListener(Current)
 		}
 
 	case "currentCell":
@@ -1692,13 +1689,11 @@ func (table *tableViewData) handleCommand(self View, command PropertyName, data
 					current.Row = row
 					current.Column = column
 					table.setRaw(Current, current.Row)
-					if listener, ok := table.changeListener[Current]; ok {
-						listener.Run(table, Current)
-					}
 
 					for _, listener := range getTwoArgEventListeners[TableView, int](table, nil, TableCellSelectedEvent) {
 						listener.Run(table, row, column)
 					}
+					table.runChangeListener(Current)
 				}
 			}
 		}

tabsLayout.go

@@ -403,7 +403,7 @@ func (tabsLayout *tabsLayoutData) Append(view View) {
 		view.SetChangeListener(TabCloseButton, tabsLayout.updateTabCloseButton)
 		if tabsLayout.created {
 			updateInnerHTML(tabsLayout.htmlID(), tabsLayout.Session())
-			tabsLayout.contentChanged()
+			tabsLayout.runChangeListener(Content)
 			tabsLayout.Set(Current, len(tabsLayout.views)-1)
 		}
 	}
@@ -427,7 +427,7 @@ func (tabsLayout *tabsLayoutData) currentChanged(newCurrent, oldCurrent int) {
 	for _, listener := range getTwoArgEventListeners[TabsLayout, int](tabsLayout, nil, CurrentTabChangedEvent) {
 		listener.Run(tabsLayout, newCurrent, oldCurrent)
 	}
-	tabsLayout.contentChanged()
+	tabsLayout.runChangeListener(Current)
 }
 
 // Remove removes view from list and return it
@@ -453,7 +453,7 @@ func (tabsLayout *tabsLayoutData) RemoveView(index int) View {
 				tabsLayout.Set(Current, newCurrent)
 			}
 			updateInnerHTML(tabsLayout.htmlID(), tabsLayout.Session())
-			tabsLayout.contentChanged()
+			tabsLayout.runChangeListener(Content)
 		} else if newCurrent != oldCurrent {
 			tabsLayout.setRaw(Current, newCurrent)
 		}

timePicker.go

@@ -176,7 +176,7 @@ func (picker *timePickerData) setFunc(tag PropertyName, value any) []PropertyNam
 			return []PropertyName{tag}
 
 		case string:
-			if isConstantName(value) {
+			if ok, _ := isConstantName(value); ok {
 				picker.setRaw(tag, value)
 				return []PropertyName{tag}
 			}
@@ -323,10 +323,7 @@ func (picker *timePickerData) handleCommand(self View, command PropertyName, dat
 					for _, listener := range getTwoArgEventListeners[TimePicker, time.Time](picker, nil, TimeChangedEvent) {
 						listener.Run(picker, value, oldValue)
 					}
-					if listener, ok := picker.changeListener[TimePickerValue]; ok {
+					picker.runChangeListener(TimePickerValue)
-						listener.Run(picker, TimePickerValue)
-					}
-
 				}
 			}
 		}

view.go

@@ -246,15 +246,19 @@ func (view *viewData) Focusable() bool {
 	return false
 }
 
+func (view *viewData) runChangeListener(tag PropertyName) {
+	if listener, ok := view.changeListener[tag]; ok {
+		listener.Run(view, tag)
+	}
+}
+
 func (view *viewData) Remove(tag PropertyName) {
 	changedTags := view.removeFunc(view.normalize(tag))
 
 	if view.created && len(changedTags) > 0 {
 		for _, tag := range changedTags {
 			view.changed(tag)
-			if listener, ok := view.changeListener[tag]; ok {
+			view.runChangeListener(tag)
-				listener.Run(view, tag)
-			}
 		}
 	}
 }
@@ -280,9 +284,7 @@ func (view *viewData) Set(tag PropertyName, value any) bool {
 	if view.created && len(changedTags) > 0 {
 		for _, tag := range changedTags {
 			view.changed(tag)
-			if listener, ok := view.changeListener[tag]; ok {
+			view.runChangeListener(tag)
-				listener.Run(view, tag)
-			}
 		}
 	}
 
@@ -910,8 +912,8 @@ func (view *viewData) propertyChanged(tag PropertyName) {
 	case DragImage:
 		if img, ok := stringProperty(view, DragImage, session); ok && img != "" {
 			img = strings.Trim(img, " \t")
-			if img[0] == '@' {
+			if ok, constName := isConstantName(img); ok {
-				img, ok = session.ImageConstant(img[1:])
+				img, ok = session.ImageConstant(constName)
 				if !ok {
 					session.removeProperty(htmlID, "data-drag-image")
 					return

viewsContainer.go

@@ -88,13 +88,7 @@ func (container *viewsContainerData) Append(view View) {
 
 		viewHTML(view, buffer, "")
 		container.Session().appendToInnerHTML(container.htmlID(), buffer.String())
-		container.contentChanged()
+		container.runChangeListener(Content)
-	}
-}
-
-func (container *viewsContainerData) contentChanged() {
-	if listener, ok := container.changeListener[Content]; ok {
-		listener.Run(container, Content)
 	}
 }
 
@@ -119,7 +113,7 @@ func (container *viewsContainerData) insert(view View, index int) bool {
 func (container *viewsContainerData) Insert(view View, index int) {
 	if container.insert(view, index) && container.created {
 		updateInnerHTML(container.htmlID(), container.Session())
-		container.contentChanged()
+		container.runChangeListener(Content)
 	}
 }
 
@@ -153,7 +147,7 @@ func (container *viewsContainerData) RemoveView(index int) View {
 	view := container.removeView(index)
 	if view != nil && container.created {
 		container.Session().callFunc("removeView", view.htmlID())
-		container.contentChanged()
+		container.runChangeListener(Content)
 	}
 	return view
 }
@@ -190,6 +184,11 @@ func viewFromTextValue(text string, session Session) View {
 			return view
 		}
 	}
+	if ok, constName := isConstantName(text); ok {
+		if view := CreateViewFromResources(session, constName); view != nil {
+			return view
+		}
+	}
 	return NewTextView(session, Params{Text: text})
 }