gamepad.js

class ScratchGamepad {
    constructor(runtime) {
        this.id = null
        this.runtime = runtime
        this.currentMSecs = -1
        this.previousButtons = []
        this.currentButtons = []
    }
    
    getInfo() {
        return {
            "id": "Gamepad",
            "name": "Gamepad",
            "blocks": [{
                    "opcode": "buttonPressedReleased",
                    "blockType": "hat",
                    "text": "button [b] [pr]",
                    "arguments": {
                        "b": {
                            "type": "number",
                            "defaultValue": "0"
                        },
                        "pr": {
                            "type": "number",
                            "defaultValue": "1",
                            "menu": "pressReleaseMenu"
                        },
                    }
            }],
            "menus": {
                "pressReleaseMenu": [{text:"press",value:1}, {text:"release",value:0}],
            }            
        };
    }
    
    update() {
        if (this.runtime.currentMSecs == this.currentMSecs)
            return
        this.currentMSecs = this.runtime.currentMSecs
        var gamepads = navigator.getGamepads()
        if (gamepads == null || gamepads.length == 0 || gamepads[0] == null) {
            this.previousButtons = []
            this.currentButtons = []
            this.axes = []
            return
        }
        var gamepad = gamepads[0]
        if (gamepad.id != this.id) {
            this.id = gamepad.id
            this.previousButtons = []
            for (var i = 0; i < gamepad.buttons.length; i++) 
                this.previousButtons.push(false)
        }
        this.previousButtons = this.currentButtons
        this.currentButtons = []
        for (var i = 0; i < gamepad.buttons.length; i++) 
            this.currentButtons.push(gamepad.buttons[i].pressed)
        this.axes = [];
        for (var i = 0; i < gamepad.axes.length; i++)
            this.axes.push(gamepad.axes[i])
    }
    
    buttonPressedReleased({b,pr}) {
        this.update()
        if (b < this.currentButtons.length) {
            if (pr == 1) {
                if (this.currentButtons[b] && ! this.previousButtons[b]) {
                    return true
                }
            }
            else {
                if (!this.currentButtons[b] && this.previousButtons[b]) {
                    return true
                }
             }
        }
        return false
    }
}

window.ScratchExtensions.Gamepad = function() {return ScratchGamepad}
window.vm.extensionManager.loadExtensionURL("Gamepad");