From f50c29e0a653597f278f3aefafe764b9a232d625 Mon Sep 17 00:00:00 2001
From: Nodeful <romankisilo@gmail.com>
Date: Fri, 2 Apr 2021 02:45:39 +0300
Subject: [PATCH] added event destroyers to all components with event listening

---
 ui/src/app/app.module.ts                      |  4 -
 .../components/loading/loading.component.html |  2 +-
 .../components/loading/loading.component.ts   |  4 +-
 .../components/tooltip/tooltip.component.html | 10 +--
 .../components/tooltip/tooltip.component.ts   |  5 ++
 ui/src/app/sections/effects/effect.service.ts | 10 ++-
 .../advanced-equalizer.component.ts           | 29 ++++--
 .../advanced-equalizer.service.ts             | 19 +++-
 .../basic-equalizer.service.ts                | 19 +++-
 .../equalizers/equalizers.component.ts        | 28 ++++--
 .../effects/equalizers/equalizers.service.ts  | 10 ++-
 .../effects/reverb/reverb.component.html      | 22 -----
 .../effects/reverb/reverb.component.scss      |  7 --
 .../effects/reverb/reverb.component.ts        | 89 -------------------
 .../sections/effects/reverb/reverb.service.ts | 39 --------
 .../app/sections/outputs/outputs.component.ts |  9 +-
 .../app/sections/outputs/outputs.service.ts   | 19 +++-
 .../sections/source/file/file.component.ts    | 25 ++++--
 .../app/sections/source/file/file.service.ts  | 20 +++--
 .../sections/source/input/input.component.ts  | 20 +++--
 .../sections/source/input/input.service.ts    | 10 ++-
 .../app/sections/source/source.component.ts   | 20 +++--
 ui/src/app/sections/source/source.service.ts  | 10 ++-
 .../balance/balance.component.ts              | 26 ++++--
 .../balance/balance.service.ts                | 10 ++-
 .../booster/booster.component.ts              | 29 ++++--
 .../booster/booster.service.ts                | 10 ++-
 ui/src/app/services/bridge.service.ts         | 69 ++++++++++----
 ui/src/app/services/data.service.ts           | 20 ++++-
 29 files changed, 332 insertions(+), 262 deletions(-)
 delete mode 100644 ui/src/app/sections/effects/reverb/reverb.component.html
 delete mode 100644 ui/src/app/sections/effects/reverb/reverb.component.scss
 delete mode 100644 ui/src/app/sections/effects/reverb/reverb.component.ts
 delete mode 100644 ui/src/app/sections/effects/reverb/reverb.service.ts

diff --git a/ui/src/app/app.module.ts b/ui/src/app/app.module.ts
index fdef7af..85dfee1 100644
--- a/ui/src/app/app.module.ts
+++ b/ui/src/app/app.module.ts
@@ -38,9 +38,6 @@ import {
 import {
   EqualizersComponent
 } from './sections/effects/equalizers/equalizers.component'
-import {
-  ReverbComponent
-} from './sections/effects/reverb/reverb.component'
 import {
   RecorderComponent
 } from './sections/recorder/recorder.component'
@@ -101,7 +98,6 @@ import { MatSnackBarModule } from '@angular/material/snack-bar'
     BoosterComponent,
     BalanceComponent,
     EqualizersComponent,
-    ReverbComponent,
     RecorderComponent,
     OutputsComponent,
     InputComponent,
diff --git a/ui/src/app/modules/eqmac-components/components/loading/loading.component.html b/ui/src/app/modules/eqmac-components/components/loading/loading.component.html
index f34afb0..98243b6 100644
--- a/ui/src/app/modules/eqmac-components/components/loading/loading.component.html
+++ b/ui/src/app/modules/eqmac-components/components/loading/loading.component.html
@@ -10,4 +10,4 @@
     </path>
   </svg>
 </div>
-<eqm-label>Loading</eqm-label>
\ No newline at end of file
+<eqm-label *ngIf="showText">{{text || 'Loading'}}</eqm-label>
\ No newline at end of file
diff --git a/ui/src/app/modules/eqmac-components/components/loading/loading.component.ts b/ui/src/app/modules/eqmac-components/components/loading/loading.component.ts
index 489d99b..5fbc885 100644
--- a/ui/src/app/modules/eqmac-components/components/loading/loading.component.ts
+++ b/ui/src/app/modules/eqmac-components/components/loading/loading.component.ts
@@ -1,4 +1,4 @@
-import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core'
+import { Component, ViewChild, ElementRef, AfterViewInit, Input } from '@angular/core'
 
 @Component({
   selector: 'eqm-loading',
@@ -7,6 +7,8 @@ import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core'
 })
 export class LoadingComponent implements AfterViewInit {
   @ViewChild('wave', { static: true }) wave: ElementRef
+  @Input() text?: string
+  @Input() showText = true
 
   ngAfterViewInit () {
     const path = this.wave.nativeElement
diff --git a/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.html b/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.html
index 9bfc410..6275a1f 100644
--- a/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.html
+++ b/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.html
@@ -1,10 +1,10 @@
 <div class="container" [ngStyle]="style">
   <div #arrow
-  [hidden]="!showArrow" 
-  class="arrow-container"
-  [ngStyle]="arrowStyle">
-    <div 
-    class="arrow"></div>
+    [hidden]="!showArrow" 
+    class="arrow-container"
+    [ngStyle]="arrowStyle"
+  >
+    <div class="arrow"></div>
   </div>
   <eqm-container class="tooltip" #tooltip>
     <ng-content></ng-content>
diff --git a/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.ts b/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.ts
index 4936740..1b30461 100644
--- a/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.ts
+++ b/ui/src/app/modules/eqmac-components/components/tooltip/tooltip.component.ts
@@ -42,6 +42,11 @@ export class TooltipComponent implements OnInit {
   }
 
   get style () {
+    if (!this.text?.length) {
+      return {
+        display: 'none'
+      }
+    }
     let x = -999
     let y = -999
     const body = document.body
diff --git a/ui/src/app/sections/effects/effect.service.ts b/ui/src/app/sections/effects/effect.service.ts
index 46585de..d564c09 100644
--- a/ui/src/app/sections/effects/effect.service.ts
+++ b/ui/src/app/sections/effects/effect.service.ts
@@ -16,7 +16,13 @@ export class EffectService extends DataService {
     return this.request({ method: 'POST', endpoint: '/enabled', data: { enabled } })
   }
 
-  onEnabledChanged (callback: (enabled: boolean) => void) {
-    this.on('/enabled', ({ enabled }) => callback(enabled))
+  onEnabledChanged (callback: EffectEnabledChangedEventCallback) {
+    this.on('/enabled', callback)
+  }
+
+  offEnabledChanged (callback: EffectEnabledChangedEventCallback) {
+    this.off('/enabled', callback)
   }
 }
+
+export type EffectEnabledChangedEventCallback = (data: { enabled: boolean }) => void
diff --git a/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.component.ts b/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.component.ts
index da03137..74817b5 100644
--- a/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.component.ts
+++ b/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.component.ts
@@ -4,9 +4,10 @@ import {
   Input,
   EventEmitter,
   Output,
-  ChangeDetectorRef
+  ChangeDetectorRef,
+  OnDestroy
 } from '@angular/core'
-import { AdvancedEqualizerService, AdvancedEqualizerPreset } from 'src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service'
+import { AdvancedEqualizerService, AdvancedEqualizerPreset, AdvancedEqualizerPresetsChangedEventCallback, AdvancedEqualizerSelectedPresetChangedEventCallback } from 'src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service'
 import { EqualizerComponent } from '../equalizer.component'
 import { Options, CheckboxOption } from 'src/app/components/options/options.component'
 import { TransitionService } from '../../../../services/transitions.service'
@@ -17,7 +18,7 @@ import { ApplicationService } from '../../../../services/app.service'
   templateUrl: './advanced-equalizer.component.html',
   styleUrls: [ './advanced-equalizer.component.scss' ]
 })
-export class AdvancedEqualizerComponent extends EqualizerComponent implements OnInit {
+export class AdvancedEqualizerComponent extends EqualizerComponent implements OnInit, OnDestroy {
   @Input() enabled = true
 
   public ShowDefaultPresetsCheckbox: CheckboxOption = {
@@ -159,15 +160,25 @@ export class AdvancedEqualizerComponent extends EqualizerComponent implements On
     this.ShowDefaultPresetsCheckbox.value = await this.service.getShowDefaultPresets()
   }
 
+  private onPresetsChangedEventCallback: AdvancedEqualizerPresetsChangedEventCallback
+  private onSelectedPresetChangedEventCallback: AdvancedEqualizerSelectedPresetChangedEventCallback
   protected setupEvents () {
-    this.service.onPresetsChanged(presets => {
+    this.onPresetsChangedEventCallback = presets => {
       if (!presets) return
       this.presets = presets
-    })
-    this.service.onSelectedPresetChanged(preset => {
+    }
+    this.service.onPresetsChanged(this.onPresetsChangedEventCallback)
+
+    this.onSelectedPresetChangedEventCallback = preset => {
       this.selectedPreset = preset
       this.setSelectedPresetsGains()
-    })
+    }
+    this.service.onSelectedPresetChanged(this.onSelectedPresetChangedEventCallback)
+  }
+
+  private destroyEvents () {
+    this.service.offPresetsChanged(this.onPresetsChangedEventCallback)
+    this.service.offSelectedPresetChanged(this.onSelectedPresetChangedEventCallback)
   }
 
   async selectPreset (preset: AdvancedEqualizerPreset) {
@@ -248,4 +259,8 @@ export class AdvancedEqualizerComponent extends EqualizerComponent implements On
   get globalGainScreenValue () {
     return `${this.selectedPreset.gains.global > 0 ? '+' : ''}${(this.selectedPreset.gains.global.toFixed(1))}dB`
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service.ts b/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service.ts
index b457924..de29436 100644
--- a/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service.ts
+++ b/ui/src/app/sections/effects/equalizers/advanced-equalizer/advanced-equalizer.service.ts
@@ -80,11 +80,22 @@ export class AdvancedEqualizerService extends EqualizersService {
     return this.request({ method: 'POST', endpoint: '/settings/show-default-presets', data: { show } })
   }
 
-  onPresetsChanged (callback: (presets: AdvancedEqualizerPreset[]) => void) {
-    this.on('/presets', (presets) => callback(presets))
+  onPresetsChanged (callback: AdvancedEqualizerPresetsChangedEventCallback) {
+    this.on('/presets', callback)
   }
 
-  onSelectedPresetChanged (callback: (preset: AdvancedEqualizerPreset) => void) {
-    this.on('/presets/selected', (preset) => callback(preset))
+  offPresetsChanged (callback: AdvancedEqualizerPresetsChangedEventCallback) {
+    this.off('/presets', callback)
+  }
+
+  onSelectedPresetChanged (callback: AdvancedEqualizerSelectedPresetChangedEventCallback) {
+    this.on('/presets/selected', callback)
+  }
+
+  offSelectedPresetChanged (callback: AdvancedEqualizerSelectedPresetChangedEventCallback) {
+    this.off('/presets/selected', callback)
   }
 }
+
+export type AdvancedEqualizerPresetsChangedEventCallback = (presets: AdvancedEqualizerPreset[]) => void
+export type AdvancedEqualizerSelectedPresetChangedEventCallback = (preset: AdvancedEqualizerPreset) => void
diff --git a/ui/src/app/sections/effects/equalizers/basic-equalizer/basic-equalizer.service.ts b/ui/src/app/sections/effects/equalizers/basic-equalizer/basic-equalizer.service.ts
index 04e442f..964758e 100644
--- a/ui/src/app/sections/effects/equalizers/basic-equalizer/basic-equalizer.service.ts
+++ b/ui/src/app/sections/effects/equalizers/basic-equalizer/basic-equalizer.service.ts
@@ -53,11 +53,22 @@ export class BasicEqualizerService extends EqualizersService {
     return this.request({ method: 'DELETE', endpoint: '/presets', data: { ...preset } as any })
   }
 
-  onPresetsChanged (callback: (presets: BasicEqualizerPreset[]) => void) {
-    this.on('/presets', (presets) => callback(presets))
+  onPresetsChanged (callback: BasicEqualizerPresetsChangedEventCallback) {
+    this.on('/presets', callback)
   }
 
-  onSelectedPresetChanged (callback: (preset: BasicEqualizerPreset) => void) {
-    this.on('/presets/selected', (preset) => callback(preset))
+  offPresetsChanged (callback: BasicEqualizerPresetsChangedEventCallback) {
+    this.off('/presets', callback)
+  }
+
+  onSelectedPresetChanged (callback: BasicEqualizerSelectedPresetChangedEventCallback) {
+    this.on('/presets/selected', callback)
+  }
+
+  offSelectedPresetChanged (callback: BasicEqualizerSelectedPresetChangedEventCallback) {
+    this.off('/presets/selected', callback)
   }
 }
+
+export type BasicEqualizerPresetsChangedEventCallback = (presets: BasicEqualizerPreset[]) => void
+export type BasicEqualizerSelectedPresetChangedEventCallback = (preset: BasicEqualizerPreset) => void
diff --git a/ui/src/app/sections/effects/equalizers/equalizers.component.ts b/ui/src/app/sections/effects/equalizers/equalizers.component.ts
index 338ea24..f73b083 100644
--- a/ui/src/app/sections/effects/equalizers/equalizers.component.ts
+++ b/ui/src/app/sections/effects/equalizers/equalizers.component.ts
@@ -1,5 +1,5 @@
-import { Component, OnInit, EventEmitter, Output, ViewChild, Input, ChangeDetectorRef } from '@angular/core'
-import { EqualizersService, EqualizerType } from './equalizers.service'
+import { Component, OnInit, EventEmitter, Output, ViewChild, Input, ChangeDetectorRef, OnDestroy } from '@angular/core'
+import { EqualizersService, EqualizersTypeChangedEventCallback, EqualizerType } from './equalizers.service'
 import { BasicEqualizerComponent } from './basic-equalizer/basic-equalizer.component'
 import { AdvancedEqualizerComponent } from './advanced-equalizer/advanced-equalizer.component'
 import { EqualizerComponent } from './equalizer.component'
@@ -8,6 +8,7 @@ import { MatDialog, MatDialogRef } from '@angular/material/dialog'
 import { OptionsDialogComponent } from '../../../components/options-dialog/options-dialog.component'
 import { EqualizerPreset } from './presets/equalizer-presets.component'
 import { UIService } from '../../../services/ui.service'
+import { EffectEnabledChangedEventCallback } from '../effect.service'
 
 @Component({
   selector: 'eqm-equalizers',
@@ -15,7 +16,7 @@ import { UIService } from '../../../services/ui.service'
   styleUrls: [ './equalizers.component.scss' ],
   animations: [ FadeInOutAnimation ]
 })
-export class EqualizersComponent implements OnInit {
+export class EqualizersComponent implements OnInit, OnDestroy {
   @Input() animationDuration = 500
   @Input() animationFps = 30
 
@@ -75,14 +76,23 @@ export class EqualizersComponent implements OnInit {
     this.enabled = await this.equalizersService.getEnabled()
   }
 
+  private onEnabledChangedEventCallback: EffectEnabledChangedEventCallback
+  private onTypeChangedEventCallback: EqualizersTypeChangedEventCallback
   protected setupEvents () {
-    this.equalizersService.onEnabledChanged(enabled => {
+    this.onEnabledChangedEventCallback = ({ enabled }) => {
       this.enabled = enabled
-    })
+    }
+    this.equalizersService.onEnabledChanged(this.onEnabledChangedEventCallback)
 
-    this.equalizersService.onTypeChanged(type => {
+    this.onTypeChangedEventCallback = ({ type }) => {
       this.type = type
-    })
+    }
+    this.equalizersService.onTypeChanged(this.onTypeChangedEventCallback)
+  }
+
+  private destroyEvents () {
+    this.equalizersService.offEnabledChanged(this.onEnabledChangedEventCallback)
+    this.equalizersService.offTypeChanged(this.onTypeChangedEventCallback)
   }
 
   setEnabled () {
@@ -133,4 +143,8 @@ export class EqualizersComponent implements OnInit {
   selectPreset (preset: EqualizerPreset) {
     return this.activeEqualizer.selectPreset(preset)
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/effects/equalizers/equalizers.service.ts b/ui/src/app/sections/effects/equalizers/equalizers.service.ts
index 153488e..60ba6fb 100644
--- a/ui/src/app/sections/effects/equalizers/equalizers.service.ts
+++ b/ui/src/app/sections/effects/equalizers/equalizers.service.ts
@@ -22,7 +22,13 @@ export class EqualizersService extends EffectService {
     return this.request({ method: 'POST', endpoint: '/type', data: { type } })
   }
 
-  onTypeChanged (callback: (type: EqualizerType) => void) {
-    this.on('/type', ({ type }) => callback(type))
+  onTypeChanged (callback: EqualizersTypeChangedEventCallback) {
+    this.on('/type', callback)
+  }
+
+  offTypeChanged (callback: EqualizersTypeChangedEventCallback) {
+    this.off('/type', callback)
   }
 }
+
+export type EqualizersTypeChangedEventCallback = (data: { type: EqualizerType }) => void
diff --git a/ui/src/app/sections/effects/reverb/reverb.component.html b/ui/src/app/sections/effects/reverb/reverb.component.html
deleted file mode 100644
index 0a19372..0000000
--- a/ui/src/app/sections/effects/reverb/reverb.component.html
+++ /dev/null
@@ -1,22 +0,0 @@
-<div class="reverb" fxLayout="column" fxFill fxLayoutAlign="center center">
-    <div fxLayout="row" [style.padding]="'0 5px'" fxLayoutAlign="space-between center" fxFill>
-        <eqm-toggle class="on-off" [(state)]="enabled" (stateChange)="setEnabled()"></eqm-toggle>
-        <eqm-label>Reverb</eqm-label>
-        <eqm-icon (click)="toggleVisibility()" [name]="hide ? 'show' : 'hide'"></eqm-icon>
-    </div>
-    <div fxFill class="reverb-controls" [fxHide]="hide">
-      <div fxLayout="row" fxFill fxLayoutAlign="space-around center">
-        <eqm-knob [min]="0" [max]="1" [(value)]="dryWetMix" (valueChange)="setMix()" [disabled]="enabled"></eqm-knob>
-        <div fxLayout="column" fxFlex="70" fxLayoutAlign="space-between start" fxLayoutGap="10px">
-          <div fxLayout="row" fxFill fxLayoutAlign="space-around start" fxLayoutGap="20px">
-            <eqm-label>Preset</eqm-label>
-            <eqm-dropdown [items]="presets" [labelParam]="'name'" [(selectedItem)]="selectedPreset"></eqm-dropdown>
-          </div>
-          <div fxLayout="row" fxFill fxLayoutGap="20px">
-            <eqm-label>Dry/Wet Mix</eqm-label>
-            <eqm-value-screen>{{formatDryWetMixValue()}}%</eqm-value-screen>
-          </div>
-        </div>
-      </div>
-    </div>
-  </div>
\ No newline at end of file
diff --git a/ui/src/app/sections/effects/reverb/reverb.component.scss b/ui/src/app/sections/effects/reverb/reverb.component.scss
deleted file mode 100644
index 9023964..0000000
--- a/ui/src/app/sections/effects/reverb/reverb.component.scss
+++ /dev/null
@@ -1,7 +0,0 @@
-.reverb {
-  position: relative;
-  
-  .reverb-controls{
-    // filter: grayscale(100%);
-  }
-}
\ No newline at end of file
diff --git a/ui/src/app/sections/effects/reverb/reverb.component.ts b/ui/src/app/sections/effects/reverb/reverb.component.ts
deleted file mode 100644
index 406c917..0000000
--- a/ui/src/app/sections/effects/reverb/reverb.component.ts
+++ /dev/null
@@ -1,89 +0,0 @@
-import {
-  Component,
-  OnInit,
-  EventEmitter,
-  Output
-} from '@angular/core'
-import {
-  ReverbService
-} from './reverb.service'
-
-@Component({
-  selector: 'eqm-reverb',
-  templateUrl: './reverb.component.html',
-  styleUrls: [ './reverb.component.scss' ]
-})
-export class ReverbComponent implements OnInit {
-  presets = []
-  dryWetMix = 0.5
-  enabled = true
-  selectedPreset = null
-  hide = false
-
-  @Output() visibilityToggled = new EventEmitter()
-
-  constructor (public reverbService: ReverbService) {}
-
-  ngOnInit () {
-    this.getPresets()
-    this.sync()
-    this.setupEvents()
-  }
-
-  protected setupEvents () {
-    this.reverbService.onEnabledChanged(enabled => {
-      this.enabled = enabled
-    })
-
-    this.reverbService.onMixChanged(mix => {
-      this.dryWetMix = mix
-    })
-
-    this.reverbService.onPresetChanged(preset => {
-      this.selectedPreset = preset
-    })
-  }
-
-  async sync () {
-    if (this.presets.length === 0) {
-      this.getPresets()
-    }
-    this.getSelectedPreset()
-    this.getMix()
-    this.getEnabled()
-  }
-
-  async getPresets () {
-    this.presets = await this.reverbService.getPresets()
-  }
-
-  async getSelectedPreset () {
-    const selectedPresetId = await this.reverbService.getSelectedPresetId()
-    this.selectedPreset = this.presets.find(preset => preset.id === selectedPresetId)
-  }
-
-  async getMix () {
-    this.dryWetMix = await this.reverbService.getMix()
-  }
-
-  setMix () {
-    this.reverbService.setMix(this.dryWetMix)
-  }
-
-  async getEnabled () {
-    this.enabled = await this.reverbService.getEnabled()
-  }
-
-  setEnabled () {
-    this.reverbService.setEnabled(this.enabled)
-  }
-
-  formatDryWetMixValue () {
-    return Math.round(this.dryWetMix * 100)
-  }
-
-  toggleVisibility () {
-    this.hide = !this.hide
-    this.visibilityToggled.emit()
-  }
-}
diff --git a/ui/src/app/sections/effects/reverb/reverb.service.ts b/ui/src/app/sections/effects/reverb/reverb.service.ts
deleted file mode 100644
index adf7a54..0000000
--- a/ui/src/app/sections/effects/reverb/reverb.service.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import { Injectable } from '@angular/core'
-import { EffectService } from '../effect.service'
-
-@Injectable({
-  providedIn: 'root'
-})
-export class ReverbService extends EffectService {
-  route = `${this.route}/reverb`
-
-  async getMix () {
-    const resp = await this.request({ method: 'GET', endpoint: '/mix' })
-    return resp.mix
-  }
-
-  setMix (mix) {
-    return this.request({ method: 'POST', endpoint: '/mix', data: { mix } })
-  }
-
-  async getPresets () {
-    return this.request({ method: 'GET', endpoint: '/presets' })
-  }
-
-  async getSelectedPresetId () {
-    const resp = await this.request({ method: 'GET', endpoint: '/preset' })
-    return resp.id
-  }
-
-  setPreset (id) {
-    return this.request({ method: 'POST', endpoint: '/preset', data: { id } })
-  }
-
-  onMixChanged (callback: (mix: number) => void) {
-    this.on(`${this.route}/mix`, ({ mix }) => callback(mix))
-  }
-
-  onPresetChanged (callback: (id: number) => void) {
-    this.on(`${this.route}/preset`, ({ preset }) => callback(preset))
-  }
-}
diff --git a/ui/src/app/sections/outputs/outputs.component.ts b/ui/src/app/sections/outputs/outputs.component.ts
index 426e46b..d88871c 100644
--- a/ui/src/app/sections/outputs/outputs.component.ts
+++ b/ui/src/app/sections/outputs/outputs.component.ts
@@ -50,7 +50,12 @@ export class OutputsComponent implements OnInit {
   }
 
   setupEventListeners () {
-    this.service.onChanged(() => this.sync())
-    this.service.onDevicesChanged(() => this.sync())
+    this.service.onSelectedChanged(this.sync.bind(this))
+    this.service.onDevicesChanged(this.sync.bind(this))
+  }
+
+  destroyEvents () {
+    this.service.offSelectedChanged(this.sync)
+    this.service.offDevicesChanged(this.sync)
   }
 }
diff --git a/ui/src/app/sections/outputs/outputs.service.ts b/ui/src/app/sections/outputs/outputs.service.ts
index 776b0d3..32a6667 100644
--- a/ui/src/app/sections/outputs/outputs.service.ts
+++ b/ui/src/app/sections/outputs/outputs.service.ts
@@ -40,11 +40,22 @@ export class OutputsService extends DataService {
     return this.request({ method: 'POST', endpoint: '/selected', data: { ...output } })
   }
 
-  onChanged (callback: (id: number) => void) {
-    this.on('/selected', ({ id }) => callback(id))
+  onSelectedChanged (callback: OutputsSelectedChangedEventCallback) {
+    this.on('/selected', callback)
   }
 
-  onDevicesChanged (callback: (devices: Output[]) => void) {
-    this.on('/devices', devices => callback(devices))
+  offSelectedChanged (callback: OutputsSelectedChangedEventCallback) {
+    this.off('/selected', callback)
+  }
+
+  onDevicesChanged (callback: OutputsDevicesChangedEventCallback) {
+    this.on('/devices', callback)
+  }
+
+  offDevicesChanged (callback: OutputsDevicesChangedEventCallback) {
+    this.off('/devices', callback)
   }
 }
+
+export type OutputsSelectedChangedEventCallback = (data: { id: number }) => void
+export type OutputsDevicesChangedEventCallback = (devices: Output[]) => void
diff --git a/ui/src/app/sections/source/file/file.component.ts b/ui/src/app/sections/source/file/file.component.ts
index 23529bb..9ec999a 100644
--- a/ui/src/app/sections/source/file/file.component.ts
+++ b/ui/src/app/sections/source/file/file.component.ts
@@ -7,6 +7,8 @@ import {
   UtilitiesService
 } from '../../../services/utilities.service'
 import {
+  FilePlayingChangedEventCallback,
+  FileProgressChangedEventCallback,
   FileService
 } from './file.service'
 import { ApplicationService } from '../../../services/app.service'
@@ -49,6 +51,7 @@ export class FileComponent implements OnInit, OnDestroy {
     if (this.progressProjectionInterval) {
       clearInterval(this.progressProjectionInterval)
     }
+    this.destroyEvents()
   }
 
   public setDefaultMeta () {
@@ -151,13 +154,23 @@ export class FileComponent implements OnInit, OnDestroy {
     }, 10)
   }
 
-  protected setupEvents () {
-    this.fileService.onPlayingChanged(playing => {
-      this.playing = playing
-    })
+  private onPlayingChangedEventCallback: FilePlayingChangedEventCallback
+  private onProgressChangedEventCallback: FileProgressChangedEventCallback
 
-    this.fileService.onProgressChanged(progress => {
+  protected setupEvents () {
+    this.onPlayingChangedEventCallback = ({ playing }) => {
+      this.playing = playing
+    }
+    this.fileService.onPlayingChanged(this.onPlayingChangedEventCallback)
+
+    this.onProgressChangedEventCallback = ({ progress }) => {
       this.progress = progress
-    })
+    }
+    this.fileService.onProgressChanged(this.onProgressChangedEventCallback)
+  }
+
+  private destroyEvents () {
+    this.fileService.offPlayingChanged(this.onPlayingChangedEventCallback)
+    this.fileService.offProgressChanged(this.onProgressChangedEventCallback)
   }
 }
diff --git a/ui/src/app/sections/source/file/file.service.ts b/ui/src/app/sections/source/file/file.service.ts
index d2b5d1d..52610e8 100644
--- a/ui/src/app/sections/source/file/file.service.ts
+++ b/ui/src/app/sections/source/file/file.service.ts
@@ -4,7 +4,6 @@ import { SourceService } from '../source.service'
 @Injectable({
   providedIn: 'root'
 })
-@Injectable()
 export class FileService extends SourceService {
   route = `${this.route}/file`
 
@@ -45,11 +44,22 @@ export class FileService extends SourceService {
     return resp.playing
   }
 
-  onPlayingChanged (callback: (playing: boolean) => void) {
-    this.on('/playing', ({ playing }) => callback(playing))
+  onPlayingChanged (callback: FilePlayingChangedEventCallback) {
+    this.on('/playing', callback)
   }
 
-  onProgressChanged (callback: (progress: number) => void) {
-    this.on('/progress', ({ progress }) => callback(progress))
+  offPlayingChanged (callback: FilePlayingChangedEventCallback) {
+    this.off('/playing', callback)
+  }
+
+  onProgressChanged (callback: FileProgressChangedEventCallback) {
+    this.on('/progress', callback)
+  }
+
+  offProgressChanged (callback: FileProgressChangedEventCallback) {
+    this.off('/progress', callback)
   }
 }
+
+export type FilePlayingChangedEventCallback = (data: { playing: boolean }) => void
+export type FileProgressChangedEventCallback = (data: { progress: number }) => void
diff --git a/ui/src/app/sections/source/input/input.component.ts b/ui/src/app/sections/source/input/input.component.ts
index df0bec7..6601194 100644
--- a/ui/src/app/sections/source/input/input.component.ts
+++ b/ui/src/app/sections/source/input/input.component.ts
@@ -1,5 +1,5 @@
-import { Component, OnInit } from '@angular/core'
-import { InputService } from './input.service'
+import { Component, OnDestroy, OnInit } from '@angular/core'
+import { InputDeviceChangedEventCallback, InputService } from './input.service'
 
 export interface InputDevice {
   deviceId: number
@@ -12,7 +12,7 @@ export interface InputDevice {
   templateUrl: './input.component.html',
   styleUrls: [ './input.component.scss' ]
 })
-export class InputComponent implements OnInit {
+export class InputComponent implements OnInit, OnDestroy {
   constructor (public inputService: InputService) { }
 
   devices: InputDevice[] = []
@@ -38,10 +38,16 @@ export class InputComponent implements OnInit {
     await this.inputService.getDevice()
   }
 
+  private onDeviceChangedEventCallback: InputDeviceChangedEventCallback
   protected setupEvents () {
-    this.inputService.onDeviceChanged((deviceId) => {
+    this.onDeviceChangedEventCallback = ({ deviceId }) => {
       this.setDeviceById(deviceId)
-    })
+    }
+    this.inputService.onDeviceChanged(this.onDeviceChangedEventCallback)
+  }
+
+  private destroyEvents () {
+    this.inputService.offDeviceChanged(this.onDeviceChangedEventCallback)
   }
 
   deviceSelected (device) {
@@ -61,4 +67,8 @@ export class InputComponent implements OnInit {
     }
     this.selectedDevice = device
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/source/input/input.service.ts b/ui/src/app/sections/source/input/input.service.ts
index f691f45..79e7a58 100644
--- a/ui/src/app/sections/source/input/input.service.ts
+++ b/ui/src/app/sections/source/input/input.service.ts
@@ -20,7 +20,13 @@ export class InputService extends SourceService {
     return this.request({ method: 'POST', endpoint: '/device', data: { deviceId } })
   }
 
-  onDeviceChanged (callback: (deviceId: number) => void) {
-    this.on(({ deviceId }) => callback(deviceId))
+  onDeviceChanged (callback: InputDeviceChangedEventCallback) {
+    this.on(callback)
+  }
+
+  offDeviceChanged (callback: InputDeviceChangedEventCallback) {
+    this.off(callback)
   }
 }
+
+export type InputDeviceChangedEventCallback = (data: { deviceId: number }) => void
diff --git a/ui/src/app/sections/source/source.component.ts b/ui/src/app/sections/source/source.component.ts
index fd0c973..1b6af80 100644
--- a/ui/src/app/sections/source/source.component.ts
+++ b/ui/src/app/sections/source/source.component.ts
@@ -1,12 +1,12 @@
-import { Component, OnInit } from '@angular/core'
-import { SourceService, SourceType } from './source.service'
+import { Component, OnDestroy, OnInit } from '@angular/core'
+import { SourceChangedEventCallback, SourceService, SourceType } from './source.service'
 
 @Component({
   selector: 'eqm-source',
   templateUrl: './source.component.html',
   styleUrls: [ './source.component.scss' ]
 })
-export class SourceComponent implements OnInit {
+export class SourceComponent implements OnInit, OnDestroy {
   source: SourceType = 'File'
   constructor (public sourceService: SourceService) { }
 
@@ -14,10 +14,16 @@ export class SourceComponent implements OnInit {
     this.setupEvents()
   }
 
+  private onSourceChangedEventCallback: SourceChangedEventCallback
   protected setupEvents () {
-    this.sourceService.onSourceChanged(source => {
+    this.onSourceChangedEventCallback = ({ source }) => {
       this.source = source
-    })
+    }
+    this.sourceService.onSourceChanged(this.onSourceChangedEventCallback)
+  }
+
+  private destroyEvents () {
+    this.sourceService.offSourceChanged(this.onSourceChangedEventCallback)
   }
 
   async setSource (source: SourceType) {
@@ -26,4 +32,8 @@ export class SourceComponent implements OnInit {
       this.sourceService.setSource(this.source)
     }
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/source/source.service.ts b/ui/src/app/sections/source/source.service.ts
index 64dd272..8ae05c5 100644
--- a/ui/src/app/sections/source/source.service.ts
+++ b/ui/src/app/sections/source/source.service.ts
@@ -18,7 +18,13 @@ export class SourceService extends DataService {
     return this.request({ method: 'POST', endpoint: '', data: { source } })
   }
 
-  onSourceChanged (callback: (source: SourceType) => void) {
-    this.on(({ source }) => callback(source))
+  onSourceChanged (callback: SourceChangedEventCallback) {
+    this.on(callback)
+  }
+
+  offSourceChanged (callback: SourceChangedEventCallback) {
+    this.off(callback)
   }
 }
+
+export type SourceChangedEventCallback = (data: { source: SourceType }) => void
diff --git a/ui/src/app/sections/volume/booster-balance/balance/balance.component.ts b/ui/src/app/sections/volume/booster-balance/balance/balance.component.ts
index b80a7c8..ec5e5c9 100644
--- a/ui/src/app/sections/volume/booster-balance/balance/balance.component.ts
+++ b/ui/src/app/sections/volume/booster-balance/balance/balance.component.ts
@@ -1,16 +1,17 @@
-import { Component, OnInit, Input } from '@angular/core'
-import { BalanceService } from './balance.service'
+import { Component, OnInit, Input, OnDestroy } from '@angular/core'
+import { BalanceChangedEventCallback, BalanceService } from './balance.service'
 import { ApplicationService } from '../../../../services/app.service'
 import { KnobValueChangedEvent } from '../../../../modules/eqmac-components/components/knob/knob.component'
 import { FlatSliderValueChangedEvent } from '../../../../modules/eqmac-components/components/flat-slider/flat-slider.component'
 import { UIService } from '../../../../services/ui.service'
+import { Subscription } from 'rxjs'
 
 @Component({
   selector: 'eqm-balance',
   templateUrl: './balance.component.html',
   styleUrls: [ './balance.component.scss' ]
 })
-export class BalanceComponent implements OnInit {
+export class BalanceComponent implements OnInit, OnDestroy {
   balance = 0
   @Input() animationDuration = 500
   @Input() animationFps = 30
@@ -40,15 +41,24 @@ export class BalanceComponent implements OnInit {
     this.replaceKnobsWithSliders = uiSettings.replaceKnobsWithSliders
   }
 
+  private onBalanceChangedEventCallback: BalanceChangedEventCallback
+  private onUISettingsChangedSubscription: Subscription
   protected setupEvents () {
-    this.balanceService.onBalanceChanged((balance) => {
+    this.onBalanceChangedEventCallback = ({ balance }) => {
       this.balance = balance
-    })
-    this.ui.settingsChanged.subscribe(uiSettings => {
+    }
+    this.balanceService.onBalanceChanged(this.onBalanceChangedEventCallback)
+
+    this.onUISettingsChangedSubscription = this.ui.settingsChanged.subscribe(uiSettings => {
       this.replaceKnobsWithSliders = uiSettings.replaceKnobsWithSliders
     })
   }
 
+  protected destroyEvents () {
+    this.balanceService.offBalanceChanged(this.onBalanceChangedEventCallback)
+    this.onUISettingsChangedSubscription?.unsubscribe()
+  }
+
   async getBalance () {
     this.balance = await this.balanceService.getBalance()
   }
@@ -62,4 +72,8 @@ export class BalanceComponent implements OnInit {
       this.app.haptic()
     }
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/volume/booster-balance/balance/balance.service.ts b/ui/src/app/sections/volume/booster-balance/balance/balance.service.ts
index 51bcfc2..3fb1a45 100644
--- a/ui/src/app/sections/volume/booster-balance/balance/balance.service.ts
+++ b/ui/src/app/sections/volume/booster-balance/balance/balance.service.ts
@@ -14,7 +14,13 @@ export class BalanceService extends VolumeService {
     return this.request({ method: 'POST', endpoint: '/balance', data: { balance, transition } })
   }
 
-  onBalanceChanged (callback: (balance: number) => void) {
-    this.on(({ balance }) => callback(balance))
+  onBalanceChanged (callback: BalanceChangedEventCallback) {
+    this.on(callback)
+  }
+
+  offBalanceChanged (callback: BalanceChangedEventCallback) {
+    this.off(callback)
   }
 }
+
+export type BalanceChangedEventCallback = (data: { balance: number }) => void
diff --git a/ui/src/app/sections/volume/booster-balance/booster/booster.component.ts b/ui/src/app/sections/volume/booster-balance/booster/booster.component.ts
index c64cc95..a397217 100644
--- a/ui/src/app/sections/volume/booster-balance/booster/booster.component.ts
+++ b/ui/src/app/sections/volume/booster-balance/booster/booster.component.ts
@@ -2,19 +2,21 @@ import {
   Component,
   OnInit,
   Input,
-  ChangeDetectorRef
+  ChangeDetectorRef,
+  OnDestroy
 } from '@angular/core'
 
-import { BoosterService } from './booster.service'
+import { BoosterGainChangedEventCallback, BoosterService } from './booster.service'
 import { ApplicationService } from '../../../../services/app.service'
-import { UIService } from '../../../../services/ui.service'
+import { UIService, UISettings } from '../../../../services/ui.service'
+import { Subscription } from 'rxjs'
 
 @Component({
   selector: 'eqm-booster',
   templateUrl: './booster.component.html',
   styleUrls: [ './booster.component.scss' ]
 })
-export class BoosterComponent implements OnInit {
+export class BoosterComponent implements OnInit, OnDestroy {
   gain = 1
   replaceKnobsWithSliders = false
   @Input() hide = false
@@ -40,18 +42,27 @@ export class BoosterComponent implements OnInit {
 
   public ignoreUpdates = false
   public ignoreUpdatesDebouncer: NodeJS.Timer
+  private onGainChangedEventCallback: BoosterGainChangedEventCallback
+  private onUISettingsChangedEventSubscription: Subscription
   protected setupEvents () {
-    this.boosterService.onGainChanged(gain => {
+    this.onGainChangedEventCallback = ({ gain }) => {
       if (!this.ignoreUpdates) {
         this.gain = gain
         this.changeRef.detectChanges()
       }
-    })
-    this.ui.settingsChanged.subscribe(uiSettings => {
+    }
+    this.boosterService.onGainChanged(this.onGainChangedEventCallback)
+
+    this.onUISettingsChangedEventSubscription = this.ui.settingsChanged.subscribe(uiSettings => {
       this.replaceKnobsWithSliders = uiSettings.replaceKnobsWithSliders
     })
   }
 
+  protected destroyEvents () {
+    this.boosterService.offGainChanged(this.onGainChangedEventCallback)
+    this.onUISettingsChangedEventSubscription.unsubscribe()
+  }
+
   async syncUISettings () {
     const uiSettings = await this.ui.getSettings()
     this.replaceKnobsWithSliders = uiSettings.replaceKnobsWithSliders
@@ -76,4 +87,8 @@ export class BoosterComponent implements OnInit {
       this.app.haptic()
     }
   }
+
+  ngOnDestroy () {
+    this.destroyEvents()
+  }
 }
diff --git a/ui/src/app/sections/volume/booster-balance/booster/booster.service.ts b/ui/src/app/sections/volume/booster-balance/booster/booster.service.ts
index 99b708a..b38c9db 100644
--- a/ui/src/app/sections/volume/booster-balance/booster/booster.service.ts
+++ b/ui/src/app/sections/volume/booster-balance/booster/booster.service.ts
@@ -15,7 +15,13 @@ export class BoosterService extends VolumeService {
     this.request({ method: 'POST', data: { gain, transition } })
   }
 
-  onGainChanged (callback: (gain: number) => void) {
-    this.on(({ gain }) => callback(gain))
+  onGainChanged (callback: BoosterGainChangedEventCallback) {
+    this.on(callback)
+  }
+
+  offGainChanged (callback: BoosterGainChangedEventCallback) {
+    this.off(callback)
   }
 }
+
+export type BoosterGainChangedEventCallback = (data: { gain: number }) => void
diff --git a/ui/src/app/services/bridge.service.ts b/ui/src/app/services/bridge.service.ts
index 740e879..d1b0831 100644
--- a/ui/src/app/services/bridge.service.ts
+++ b/ui/src/app/services/bridge.service.ts
@@ -17,9 +17,12 @@ type CallHandlerCallback = (data?: BridgeResponseData) => void
 type RegisterHandler = (handler: string, cb: RegisterHandlerCallback) => void
 type RegisterHandlerCallback = (data: JSONData, cb: (data?: BridgeResponseData) => void) => void
 
+type EventHandler = (data: JSONData, res: BridgeResponse) => void | Promise<void>
+
 interface JSBridge {
   callHandler: CallHandler
   registerHandler: RegisterHandler
+  disableJavscriptAlertBoxSafetyTimeout: () => void
 }
 
 /**
@@ -32,6 +35,10 @@ interface JSBridge {
 export class BridgeService {
   public static bridgeLoadTimeout = 10000
   public static bridgeLoadPromise: Promise<JSBridge> = null
+  private static didSpeedUp = false
+  private static readonly handlers: {
+    [event: string]: EventHandler[]
+  } = {}
 
   public get bridge () {
     if (BridgeService.bridgeLoadPromise) {
@@ -66,6 +73,10 @@ export class BridgeService {
   async call (handler: string, data?: JSONData): Promise<any> {
     return new Promise(async (resolve, reject) => {
       const bridge = await this.bridge
+      if (!BridgeService.didSpeedUp) {
+        BridgeService.didSpeedUp = true
+        bridge.disableJavscriptAlertBoxSafetyTimeout()
+      }
       bridge.callHandler(handler, data, res => {
         const err = res.error
         return err ? reject(new Error(err)) : resolve(res.data)
@@ -73,22 +84,48 @@ export class BridgeService {
     })
   }
 
-  async on (event: string, handler: (data: JSONData, res: BridgeResponse) => void | Promise<void>) {
+  async on (event: string, handler: EventHandler) {
     const bridge = await this.bridge
-    bridge.registerHandler(event, async (data, cb) => {
-      const handleError = (err: string | Error) => {
-        console.error(err)
-        // eslint-disable-next-line @typescript-eslint/no-base-to-string
-        cb({ error: err.toString() })
-      }
-      try {
-        await handler(data, {
-          send: (data) => cb({ data }),
-          error: (err) => handleError(err)
-        })
-      } catch (err) {
-        handleError(err)
-      }
-    })
+    let shouldRegister = false
+    if (!(event in BridgeService.handlers)) {
+      BridgeService.handlers[event] = []
+      shouldRegister = true
+    }
+
+    BridgeService.handlers[event].push(handler)
+
+    if (shouldRegister) {
+      bridge.registerHandler(event, async (data, cb) => {
+        const handleError = (err: string | Error) => {
+          console.error(err)
+          // eslint-disable-next-line @typescript-eslint/no-base-to-string
+          cb({ error: err.toString() })
+        }
+
+        for (const handler of BridgeService.handlers[event]) {
+          try {
+            await handler(data, {
+              send: (data) => cb({ data }),
+              error: (err) => handleError(err)
+            })
+          } catch (err) {
+            handleError(err)
+          }
+        }
+      })
+    }
+  }
+
+  async off (event: string, handler: EventHandler) {
+    if (!BridgeService.handlers[event]?.length) {
+      console.error(`Trying to unsubscribe from event: "${event}" when there are no handlers registered`)
+      return
+    }
+    const index = BridgeService.handlers[event]?.indexOf(handler)
+    if (index > -1) {
+      BridgeService.handlers[event].splice(index, 1)
+    } else {
+      console.error(`Trying to unsubscribe from event: "${event}" with a handler that is not registered`)
+    }
   }
 }
diff --git a/ui/src/app/services/data.service.ts b/ui/src/app/services/data.service.ts
index 8100be9..212335b 100644
--- a/ui/src/app/services/data.service.ts
+++ b/ui/src/app/services/data.service.ts
@@ -31,11 +31,23 @@ export class DataService {
     return resp
   }
 
+  private normalizeEventCallback (eventOrCallback: string | EventCallback, callback?: EventCallback) {
+    const event = typeof eventOrCallback === 'string' ? eventOrCallback : ''
+    callback = typeof eventOrCallback === 'function' ? eventOrCallback : callback
+    return { event, callback }
+  }
+
   async on (callback: EventCallback)
   async on (event: string, callback: EventCallback)
-  async on (eventOrCallback: string | EventCallback, callback?: EventCallback) {
-    const eventName = typeof eventOrCallback === 'string' ? eventOrCallback : ''
-    callback = typeof eventOrCallback === 'function' ? eventOrCallback : callback
-    this.bridge.on(`${this.route}${eventName}`, callback)
+  async on (eventOrCallback: string | EventCallback, cb?: EventCallback) {
+    const { event, callback } = this.normalizeEventCallback(eventOrCallback, cb)
+    this.bridge.on(`${this.route}${event}`, callback)
+  }
+
+  async off (callback: EventCallback)
+  async off (event: string, callback: EventCallback)
+  async off (eventOrCallback: string | EventCallback, cb?: EventCallback) {
+    const { event, callback } = this.normalizeEventCallback(eventOrCallback, cb)
+    this.bridge.off(`${this.route}${event}`, callback)
   }
 }