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rui/canvasView.go

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2021-09-07 17:36:50 +03:00
package rui
import "strings"
// DrawFunction is the constant for the "draw-function" property tag.
// The "draw-function" property sets the draw function of CanvasView.
// The function should have the following format: func(Canvas)
const DrawFunction = "draw-function"
// CanvasView interface of a custom draw view
type CanvasView interface {
View
Redraw()
}
type canvasViewData struct {
viewData
drawer func(Canvas)
}
// NewCanvasView creates the new custom draw view
func NewCanvasView(session Session, params Params) CanvasView {
view := new(canvasViewData)
view.Init(session)
setInitParams(view, params)
return view
}
func newCanvasView(session Session) View {
return NewCanvasView(session, nil)
}
// Init initialize fields of ViewsContainer by default values
func (canvasView *canvasViewData) Init(session Session) {
canvasView.viewData.Init(session)
canvasView.tag = "CanvasView"
}
func (canvasView *canvasViewData) normalizeTag(tag string) string {
tag = strings.ToLower(tag)
switch tag {
case "draw-func":
tag = DrawFunction
}
return tag
}
func (canvasView *canvasViewData) Remove(tag string) {
canvasView.remove(canvasView.normalizeTag(tag))
}
func (canvasView *canvasViewData) remove(tag string) {
if tag == DrawFunction {
canvasView.drawer = nil
canvasView.Redraw()
canvasView.propertyChangedEvent(tag)
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} else {
canvasView.viewData.remove(tag)
}
}
func (canvasView *canvasViewData) Set(tag string, value interface{}) bool {
return canvasView.set(canvasView.normalizeTag(tag), value)
}
func (canvasView *canvasViewData) set(tag string, value interface{}) bool {
if tag == DrawFunction {
if value == nil {
canvasView.drawer = nil
} else if fn, ok := value.(func(Canvas)); ok {
canvasView.drawer = fn
} else {
notCompatibleType(tag, value)
return false
}
canvasView.Redraw()
canvasView.propertyChangedEvent(tag)
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return true
}
return canvasView.viewData.set(tag, value)
}
func (canvasView *canvasViewData) Get(tag string) interface{} {
return canvasView.get(canvasView.normalizeTag(tag))
}
func (canvasView *canvasViewData) get(tag string) interface{} {
if tag == DrawFunction {
return canvasView.drawer
}
return canvasView.viewData.get(tag)
}
func (canvasView *canvasViewData) htmlTag() string {
return "canvas"
}
func (canvasView *canvasViewData) Redraw() {
if canvasView.drawer != nil {
canvas := newCanvas(canvasView)
canvas.ClearRect(0, 0, canvasView.frame.Width, canvasView.frame.Height)
if canvasView.drawer != nil {
canvasView.drawer(canvas)
}
canvasView.session.runScript(canvas.finishDraw())
}
}
func (canvasView *canvasViewData) onResize(self View, x, y, width, height float64) {
canvasView.viewData.onResize(self, x, y, width, height)
canvasView.Redraw()
}
// RedrawCanvasView finds CanvasView with canvasViewID and redraws it
func RedrawCanvasView(rootView View, canvasViewID string) {
if canvas := CanvasViewByID(rootView, canvasViewID); canvas != nil {
canvas.Redraw()
}
}