ebiten/examples/windowclosing/main.go

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// Copyright 2021 The Ebiten Authors
//
// 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.
2021-06-24 14:49:37 +02:00
//go:build example
// +build example
package main
import (
"errors"
"log"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/inpututil"
)
var regularTermination = errors.New("regular termination")
type Game struct {
windowClosingHandled bool
}
func (g *Game) Update() error {
if ebiten.IsWindowBeingClosed() {
g.windowClosingHandled = true
}
if g.windowClosingHandled {
if inpututil.IsKeyJustPressed(ebiten.KeyY) {
return regularTermination
}
if inpututil.IsKeyJustPressed(ebiten.KeyN) {
g.windowClosingHandled = false
}
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
if !g.windowClosingHandled {
ebitenutil.DebugPrint(screen, "Try to close this window. This works only on desktops.")
return
}
ebitenutil.DebugPrint(screen, "Do you really want to close this window? [y/n]")
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return outsideWidth, outsideHeight
}
func main() {
ebiten.SetWindowClosingHandled(true)
ebiten.SetWindowTitle("Window Closing (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil && !errors.Is(err, regularTermination) {
log.Fatal(err)
}
}