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