hooks.go (1648B)
1 // Copyright 2018 The Ebiten Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package hooks 16 17 import ( 18 "sync" 19 ) 20 21 var m sync.Mutex 22 23 var onBeforeUpdateHooks = []func() error{} 24 25 // AppendHookOnBeforeUpdate appends a hook function that is run before the main update function 26 // every frame. 27 func AppendHookOnBeforeUpdate(f func() error) { 28 m.Lock() 29 onBeforeUpdateHooks = append(onBeforeUpdateHooks, f) 30 m.Unlock() 31 } 32 33 func RunBeforeUpdateHooks() error { 34 m.Lock() 35 defer m.Unlock() 36 37 for _, f := range onBeforeUpdateHooks { 38 if err := f(); err != nil { 39 return err 40 } 41 } 42 return nil 43 } 44 45 var ( 46 audioSuspended bool 47 onSuspendAudio func() 48 onResumeAudio func() 49 ) 50 51 func OnSuspendAudio(f func()) { 52 m.Lock() 53 onSuspendAudio = f 54 m.Unlock() 55 } 56 57 func OnResumeAudio(f func()) { 58 m.Lock() 59 onResumeAudio = f 60 m.Unlock() 61 } 62 63 func SuspendAudio() { 64 m.Lock() 65 defer m.Unlock() 66 if audioSuspended { 67 return 68 } 69 audioSuspended = true 70 if onSuspendAudio != nil { 71 onSuspendAudio() 72 } 73 } 74 75 func ResumeAudio() { 76 m.Lock() 77 defer m.Unlock() 78 if !audioSuspended { 79 return 80 } 81 audioSuspended = false 82 if onResumeAudio != nil { 83 onResumeAudio() 84 } 85 }