rui_orig/wasmBridge.go

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2022-11-02 21:05:55 +03:00
//go:build wasm
package rui
import (
"fmt"
"strconv"
"sync"
"syscall/js"
)
type wasmBridge struct {
queue chan string
answer map[int]chan DataObject
answerID int
answerMutex sync.Mutex
closed bool
canvas js.Value
}
func createWasmBridge() webBridge {
bridge := new(wasmBridge)
bridge.queue = make(chan string, 1000)
bridge.answerID = 1
bridge.answer = make(map[int]chan DataObject)
bridge.closed = false
return bridge
}
func (bridge *wasmBridge) startUpdateScript(htmlID string) bool {
return false
}
func (bridge *wasmBridge) finishUpdateScript(htmlID string) {
}
func (bridge *wasmBridge) callFunc(funcName string, args ...any) bool {
if ProtocolInDebugLog {
text := funcName + "("
for i, arg := range args {
if i > 0 {
text += fmt.Sprintf(", `%v`", arg)
} else {
text += fmt.Sprintf("`%v`", arg)
}
}
DebugLog(text + ")")
}
js.Global().Call(funcName, args...)
return true
}
func (bridge *wasmBridge) updateInnerHTML(htmlID, html string) {
bridge.callFunc("updateInnerHTML", htmlID, html)
}
func (bridge *wasmBridge) appendToInnerHTML(htmlID, html string) {
bridge.callFunc("appendToInnerHTML", htmlID, html)
}
func (bridge *wasmBridge) updateCSSProperty(htmlID, property, value string) {
bridge.callFunc("updateCSSProperty", htmlID, property, value)
}
func (bridge *wasmBridge) updateProperty(htmlID, property string, value any) {
bridge.callFunc("updateProperty", htmlID, property, value)
}
func (bridge *wasmBridge) removeProperty(htmlID, property string) {
bridge.callFunc("removeProperty", htmlID, property)
}
func (bridge *wasmBridge) close() {
}
func (bridge *wasmBridge) readMessage() (string, bool) {
return "", false
}
func (bridge *wasmBridge) writeMessage(script string) bool {
if ProtocolInDebugLog {
DebugLog("Run script:")
DebugLog(script)
}
window := js.Global().Get("window")
window.Call("execScript", script)
return true
}
func (bridge *wasmBridge) cavnasStart(htmlID string) {
bridge.canvas = js.Global().Call("getCanvasContext", htmlID)
}
func (bridge *wasmBridge) callCanvasFunc(funcName string, args ...any) {
if !bridge.canvas.IsNull() {
for i, arg := range args {
if array, ok := arg.([]float64); ok {
arr := make([]any, len(array))
for k, x := range array {
arr[k] = x
}
args[i] = js.ValueOf(array)
}
}
bridge.canvas.Call(funcName, args...)
}
}
func (bridge *wasmBridge) callCanvasVarFunc(v any, funcName string, args ...any) {
if jsVar, ok := v.(js.Value); ok && !jsVar.IsNull() {
jsVar.Call(funcName, args...)
}
}
func (bridge *wasmBridge) callCanvasImageFunc(url string, property string, funcName string, args ...any) {
image := js.Global().Get("images").Call("get", url)
if !image.IsUndefined() && !image.IsNull() {
result := image.Call(funcName, args...)
if property != "" {
bridge.canvas.Set(property, result)
}
}
}
func (bridge *wasmBridge) createCanvasVar(funcName string, args ...any) any {
if bridge.canvas.IsNull() {
return bridge.canvas
}
return bridge.canvas.Call(funcName, args...)
}
func (bridge *wasmBridge) updateCanvasProperty(property string, value any) {
if !bridge.canvas.IsNull() {
bridge.canvas.Set(property, value)
}
}
func (bridge *wasmBridge) cavnasFinish() {
}
func (bridge *wasmBridge) canvasTextMetrics(htmlID, font, text string) TextMetrics {
result := js.Global().Call("canvasTextMetrics", 0, htmlID, font, text).String()
DebugLog(result)
// TODO
return TextMetrics{}
}
func (bridge *wasmBridge) htmlPropertyValue(htmlID, name string) string {
return ""
}
func (bridge *wasmBridge) answerReceived(answer DataObject) {
if text, ok := answer.PropertyValue("answerID"); ok {
if id, err := strconv.Atoi(text); err == nil {
if chanel, ok := bridge.answer[id]; ok {
chanel <- answer
delete(bridge.answer, id)
} else {
ErrorLog("Bad answerID = " + text + " (chan not found)")
}
} else {
ErrorLog("Invalid answerID = " + text)
}
} else {
ErrorLog("answerID not found")
}
}
func (bridge *wasmBridge) remoteAddr() string {
return "localhost"
}