package rui import ( "fmt" "strconv" "strings" ) const ( // DefaultAnimation - default animation of StackLayout push DefaultAnimation = 0 // StartToEndAnimation - start to end animation of StackLayout push StartToEndAnimation = 1 // EndToStartAnimation - end to start animation of StackLayout push EndToStartAnimation = 2 // TopDownAnimation - top down animation of StackLayout push TopDownAnimation = 3 // BottomUpAnimation - bottom up animation of StackLayout push BottomUpAnimation = 4 ) // StackLayout - list-container of View type StackLayout interface { ViewsContainer Peek() View MoveToFront(view View) bool MoveToFrontByID(viewID string) bool Push(view View, animation int, onPushFinished func()) Pop(animation int, onPopFinished func(View)) bool } type stackLayoutData struct { viewsContainerData peek int pushView, popView View animationType int onPushFinished func() onPopFinished func(View) } // NewStackLayout create new StackLayout object and return it func NewStackLayout(session Session, params Params) StackLayout { view := new(stackLayoutData) view.Init(session) setInitParams(view, params) return view } func newStackLayout(session Session) View { return NewStackLayout(session, nil) } // Init initialize fields of ViewsContainer by default values func (layout *stackLayoutData) Init(session Session) { layout.viewsContainerData.Init(session) layout.tag = "StackLayout" layout.systemClass = "ruiStackLayout" layout.properties[TransitionEndEvent] = []func(View, string){layout.pushFinished, layout.popFinished} } func (layout *stackLayoutData) String() string { return getViewString(layout) } func (layout *stackLayoutData) pushFinished(view View, tag string) { if tag == "ruiPush" { if layout.pushView != nil { layout.pushView = nil count := len(layout.views) if count > 0 { layout.peek = count - 1 } else { layout.peek = 0 } updateInnerHTML(layout.htmlID(), layout.session) layout.propertyChangedEvent(Current) } if layout.onPushFinished != nil { onPushFinished := layout.onPushFinished layout.onPushFinished = nil onPushFinished() } } } func (layout *stackLayoutData) popFinished(view View, tag string) { if tag == "ruiPop" { popView := layout.popView layout.popView = nil updateInnerHTML(layout.htmlID(), layout.session) if layout.onPopFinished != nil { onPopFinished := layout.onPopFinished layout.onPopFinished = nil onPopFinished(popView) } } } func (layout *stackLayoutData) Set(tag string, value any) bool { return layout.set(strings.ToLower(tag), value) } func (layout *stackLayoutData) set(tag string, value any) bool { if value == nil { layout.remove(tag) return true } switch tag { case TransitionEndEvent: listeners, ok := valueToEventListeners[View, string](value) if ok && listeners != nil { listeners = append(listeners, layout.pushFinished) listeners = append(listeners, layout.popFinished) layout.properties[TransitionEndEvent] = listeners layout.propertyChangedEvent(TransitionEndEvent) } return ok case Current: setCurrent := func(index int) { if index != layout.peek { if layout.peek < len(layout.views) { updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(layout.peek), "visibility", "hidden", layout.Session()) } layout.peek = index updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(index), "visibility", "visible", layout.Session()) layout.propertyChangedEvent(Current) } } switch value := value.(type) { case string: text, ok := layout.session.resolveConstants(value) if !ok { invalidPropertyValue(tag, value) return false } n, err := strconv.Atoi(strings.Trim(text, " \t")) if err != nil { invalidPropertyValue(tag, value) ErrorLog(err.Error()) return false } setCurrent(n) default: n, ok := isInt(value) if !ok { notCompatibleType(tag, value) return false } else if n < 0 || n >= len(layout.views) { ErrorLogF(`The view index "%d" of "%s" property is out of range`, n, tag) return false } setCurrent(n) } return true } return layout.viewsContainerData.set(tag, value) } func (layout *stackLayoutData) Remove(tag string) { layout.remove(strings.ToLower(tag)) } func (layout *stackLayoutData) remove(tag string) { switch tag { case TransitionEndEvent: layout.properties[TransitionEndEvent] = []func(View, string){layout.pushFinished, layout.popFinished} layout.propertyChangedEvent(TransitionEndEvent) case Current: layout.set(Current, 0) default: layout.viewsContainerData.remove(tag) } } func (layout *stackLayoutData) Get(tag string) any { return layout.get(strings.ToLower(tag)) } func (layout *stackLayoutData) get(tag string) any { if tag == Current { return layout.peek } return layout.viewsContainerData.get(tag) } func (layout *stackLayoutData) Peek() View { if int(layout.peek) < len(layout.views) { return layout.views[layout.peek] } return nil } func (layout *stackLayoutData) MoveToFront(view View) bool { peek := int(layout.peek) htmlID := view.htmlID() for i, view2 := range layout.views { if view2.htmlID() == htmlID { if i != peek { if peek < len(layout.views) { updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(peek), "visibility", "hidden", layout.Session()) } layout.peek = i updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(i), "visibility", "visible", layout.Session()) layout.propertyChangedEvent(Current) } return true } } ErrorLog(`MoveToFront() fail. Subview not found."`) return false } func (layout *stackLayoutData) MoveToFrontByID(viewID string) bool { peek := int(layout.peek) for i, view := range layout.views { if view.ID() == viewID { if i != peek { if peek < len(layout.views) { updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(peek), "visibility", "hidden", layout.Session()) } layout.peek = i updateCSSProperty(layout.htmlID()+"page"+strconv.Itoa(i), "visibility", "visible", layout.Session()) layout.propertyChangedEvent(Current) } return true } } ErrorLogF(`MoveToFront("%s") fail. Subview with "%s" not found."`, viewID, viewID) return false } func (layout *stackLayoutData) Append(view View) { if view != nil { layout.peek = len(layout.views) layout.viewsContainerData.Append(view) layout.propertyChangedEvent(Current) } else { ErrorLog("StackLayout.Append(nil, ....) is forbidden") } } func (layout *stackLayoutData) Insert(view View, index int) { if view != nil { count := len(layout.views) if index < count { layout.peek = int(index) } else { layout.peek = count } layout.viewsContainerData.Insert(view, index) layout.propertyChangedEvent(Current) } else { ErrorLog("StackLayout.Insert(nil, ....) is forbidden") } } func (layout *stackLayoutData) RemoveView(index int) View { if index < 0 || index >= len(layout.views) { return nil } if layout.peek > 0 { layout.peek-- } defer layout.propertyChangedEvent(Current) return layout.viewsContainerData.RemoveView(index) } func (layout *stackLayoutData) Push(view View, animation int, onPushFinished func()) { if view == nil { ErrorLog("StackLayout.Push(nil, ....) is forbidden") return } layout.pushView = view layout.animationType = animation //layout.animation["ruiPush"] = Animation{FinishListener: layout} layout.onPushFinished = onPushFinished htmlID := layout.htmlID() session := layout.Session() buffer := allocStringBuilder() defer freeStringBuilder(buffer) buffer.WriteString(`
`) viewHTML(layout.pushView, buffer) buffer.WriteString(`
`) appendToInnerHTML(htmlID, buffer.String(), session) updateCSSProperty(htmlID+"push", "transform", "translate(0px, 0px)", layout.session) layout.views = append(layout.views, view) view.setParentID(htmlID) layout.propertyChangedEvent(Content) } func (layout *stackLayoutData) Pop(animation int, onPopFinished func(View)) bool { count := len(layout.views) if count == 0 || layout.peek >= count { ErrorLog("StackLayout is empty") return false } layout.popView = layout.views[layout.peek] layout.RemoveView(layout.peek) layout.animationType = animation //layout.animation["ruiPop"] = Animation{FinishListener: layout} layout.onPopFinished = onPopFinished htmlID := layout.htmlID() session := layout.Session() buffer := allocStringBuilder() defer freeStringBuilder(buffer) buffer.WriteString(`
`) viewHTML(layout.popView, buffer) buffer.WriteString(`
`) appendToInnerHTML(htmlID, buffer.String(), session) var value string switch layout.animationType { case TopDownAnimation: value = fmt.Sprintf("translate(0px, -%gpx)", layout.frame.Height) case BottomUpAnimation: value = fmt.Sprintf("translate(0px, %gpx)", layout.frame.Height) case StartToEndAnimation: value = fmt.Sprintf("translate(-%gpx, 0px)", layout.frame.Width) default: value = fmt.Sprintf("translate(%gpx, 0px)", layout.frame.Width) } updateCSSProperty(htmlID+"pop", "transform", value, layout.session) return true } func (layout *stackLayoutData) htmlSubviews(self View, buffer *strings.Builder) { count := len(layout.views) if count > 0 { htmlID := layout.htmlID() peek := int(layout.peek) if peek >= count { peek = count - 1 } for i, view := range layout.views { buffer.WriteString(``) } } }