ebiten/internal/ui/ui_js.go

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// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build js
package ui
import (
"github.com/gopherjs/gopherjs/js"
"github.com/gopherjs/webgl"
"github.com/hajimehoshi/ebiten/internal/opengl"
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"strconv"
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"time"
)
var canvas js.Object
var context *opengl.Context
func Use(f func(*opengl.Context)) {
f(context)
}
func DoEvents() {
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time.Sleep(0)
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}
func Terminate() {
// Do nothing.
}
func IsClosed() bool {
return false
}
func SwapBuffers() {
// Do nothing.
}
func init() {
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ch := make(chan struct{})
js.Global.Get("window").Set("onload", func() {
close(ch)
})
<-ch
doc := js.Global.Get("document")
canvas = doc.Call("createElement", "canvas")
canvas.Set("width", 16)
canvas.Set("height", 16)
doc.Get("body").Call("appendChild", canvas)
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htmlStyle := doc.Get("documentElement").Get("style")
htmlStyle.Set("height", "100%")
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htmlStyle.Set("margin", "0")
htmlStyle.Set("padding", "0")
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bodyStyle := doc.Get("body").Get("style")
bodyStyle.Set("backgroundColor", "#000")
bodyStyle.Set("position", "relative")
bodyStyle.Set("height", "100%")
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bodyStyle.Set("margin", "0")
bodyStyle.Set("padding", "0")
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canvasStyle := canvas.Get("style")
canvasStyle.Set("position", "absolute")
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webglContext, err := webgl.NewContext(canvas, &webgl.ContextAttributes{
Alpha: true,
PremultipliedAlpha: true,
})
if err != nil {
panic(err)
}
context = opengl.NewContext(webglContext)
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// Make the canvas focusable.
canvas.Call("setAttribute", "tabindex", 1)
canvas.Get("style").Set("outline", "none")
canvas.Set("onkeydown", func(e js.Object) {
code := e.Get("keyCode").Int()
currentInput.keyDown(code)
button := e.Get("button").Int()
currentInput.mouseDown(button)
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})
canvas.Set("onkeyup", func(e js.Object) {
code := e.Get("keyCode").Int()
currentInput.keyUp(code)
button := e.Get("button").Int()
currentInput.mouseUp(button)
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})
canvas.Set("onmousedown", func(e js.Object) {
button := e.Get("button").Int()
currentInput.mouseDown(button)
})
canvas.Set("onmouseup", func(e js.Object) {
button := e.Get("button").Int()
currentInput.mouseUp(button)
})
canvas.Set("oncontextmenu", func(e js.Object) bool {
return false
})
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}
func Start(width, height, scale int, title string) (actualScale int, err error) {
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doc := js.Global.Get("document")
doc.Set("title", title)
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canvas.Set("width", width*scale)
canvas.Set("height", height*scale)
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canvasStyle := canvas.Get("style")
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canvasStyle.Set("left", "calc(50% - "+strconv.Itoa(width*scale/2)+"px)")
canvasStyle.Set("top", "calc(50% - "+strconv.Itoa(height*scale/2)+"px)")
canvas.Set("onmousemove", func(e js.Object) {
rect := canvas.Call("getBoundingClientRect")
x, y := e.Get("clientX").Int(), e.Get("clientY").Int()
x -= rect.Get("left").Int()
y -= rect.Get("top").Int()
currentInput.mouseMove(x/scale, y/scale)
})
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return scale, nil
}