go-susapp/keyhandler.go

package main

import (
	"codehub.onpointcoding.net/sean/go-susapp/enum"
	"github.com/gotk3/gotk3/gdk"
	"github.com/gotk3/gotk3/gtk"
)

type KeyInputHandler struct {
	state *State
}

func NewKeyInputHandler(state *State) *KeyInputHandler {
	return &KeyInputHandler{state}
}

func (input *KeyInputHandler) keyPressEvent(win *gtk.ApplicationWindow, ev *gdk.Event) {
	keyEvent := gdk.EventKeyNewFromEvent(ev)
	k := gdk.KeyvalToUpper(keyEvent.KeyVal())
	if input.state.Screen == enum.SCREEN_TITLE && input.state.IsTypingReady {
		if k >= gdk.KEY_A && k <= gdk.KEY_Z {
			input.state.TypedGameID = input.state.TypedGameID + string(gdk.KeyvalToUnicode(k))
		} else if k == gdk.KEY_BackSpace {
			if len(input.state.TypedGameID) > 0 {
				input.state.TypedGameID = input.state.TypedGameID[:len(input.state.TypedGameID)-1]
			}
		}
	} else if input.state.Screen == enum.SCREEN_LOBBY || input.state.Screen == enum.SCREEN_INGAME {
		if k == gdk.KEY_W {
			input.state.HoldingUp = true
		}
		if k == gdk.KEY_A {
			input.state.HoldingLeft = true
		}
		if k == gdk.KEY_S {
			input.state.HoldingDown = true
		}
		if k == gdk.KEY_D {
			input.state.HoldingRight = true
		}
		input.updateMovementDirections()
	}
}

func (input *KeyInputHandler) keyReleaseEvent(win *gtk.ApplicationWindow, ev *gdk.Event) {
	keyEvent := gdk.EventKeyNewFromEvent(ev)
	k := gdk.KeyvalToUpper(keyEvent.KeyVal())
	if k == gdk.KEY_W {
		input.state.HoldingUp = false
	}
	if k == gdk.KEY_A {
		input.state.HoldingLeft = false
	}
	if k == gdk.KEY_S {
		input.state.HoldingDown = false
	}
	if k == gdk.KEY_D {
		input.state.HoldingRight = false
	}
	input.updateMovementDirections()
}

func (input *KeyInputHandler) updateMovementDirections() {
	input.state.MovementX = 0
	input.state.MovementY = 0
	if input.state.HoldingUp {
		input.state.MovementY--
	}
	if input.state.HoldingLeft {
		input.state.MovementX--
	}
	if input.state.HoldingDown {
		input.state.MovementY++
	}
	if input.state.HoldingRight {
		input.state.MovementX++
	}
}