From 770b01499b0de7d0c98db68f0d56165def759892 Mon Sep 17 00:00:00 2001
From: Johan Groth <johan.groth@lime.tech>
Date: Fri, 29 Mar 2019 08:48:59 +0100
Subject: [PATCH] perf(mdc): remove event listeners when components are
 destroyed

---
 src/components/dialog/dialog.tsx     | 51 +++++++++++++++++-----------
 src/components/slider/slider.tsx     |  1 +
 src/components/snackbar/snackbar.tsx | 26 +++++++++-----
 3 files changed, 51 insertions(+), 27 deletions(-)

diff --git a/src/components/dialog/dialog.tsx b/src/components/dialog/dialog.tsx
index 2b947c6c1e..314c1943bb 100644
--- a/src/components/dialog/dialog.tsx
+++ b/src/components/dialog/dialog.tsx
@@ -64,6 +64,12 @@ export class Dialog {
 
     private id: string;
 
+    constructor() {
+        this.handleMdcOpened = this.handleMdcOpened.bind(this);
+        this.handleMdcClosed = this.handleMdcClosed.bind(this);
+        this.handleMdcClosing = this.handleMdcClosing.bind(this);
+    }
+
     public componentWillLoad() {
         this.id = createRandomString();
     }
@@ -90,25 +96,9 @@ export class Dialog {
             deactivate();
         };
 
-        this.mdcDialog.listen('MDCDialog:opened', () => {
-            // When the opening-animation has completed, dispatch a
-            // resize-event so that any content that depends on
-            // javascript for layout has a chance to update to the
-            // final layout of the dialog. /Ads
-            dispatchResizeEvent();
-        });
-
-        this.mdcDialog.listen('MDCDialog:closed', () => {
-            if (this.open) {
-                this.close.emit();
-            }
-
-            this.open = false;
-        });
-
-        this.mdcDialog.listen('MDCDialog:closing', () => {
-            this.closing.emit();
-        });
+        this.mdcDialog.listen('MDCDialog:opened', this.handleMdcOpened);
+        this.mdcDialog.listen('MDCDialog:closed', this.handleMdcClosed);
+        this.mdcDialog.listen('MDCDialog:closing', this.handleMdcClosing);
 
         this.mdcDialog.scrimClickAction = this.closingActions.scrimClick
             ? 'close'
@@ -119,6 +109,9 @@ export class Dialog {
     }
 
     public componentDidUnload() {
+        this.mdcDialog.unlisten('MDCDialog:opened', this.handleMdcOpened);
+        this.mdcDialog.unlisten('MDCDialog:closed', this.handleMdcClosed);
+        this.mdcDialog.unlisten('MDCDialog:closing', this.handleMdcClosing);
         this.mdcDialog.destroy();
     }
 
@@ -168,6 +161,26 @@ export class Dialog {
         }
     }
 
+    private handleMdcOpened() {
+        // When the opening-animation has completed, dispatch a
+        // resize-event so that any content that depends on
+        // javascript for layout has a chance to update to the
+        // final layout of the dialog. /Ads
+        dispatchResizeEvent();
+    }
+
+    private handleMdcClosed() {
+        if (this.open) {
+            this.close.emit();
+        }
+
+        this.open = false;
+    }
+
+    private handleMdcClosing() {
+        this.closing.emit();
+    }
+
     private renderHeading() {
         if (this.heading) {
             return <h2 class="mdc-dialog__title">{this.heading.trim()}</h2>;
diff --git a/src/components/slider/slider.tsx b/src/components/slider/slider.tsx
index 3b9b0ba0d6..c997c0d60d 100644
--- a/src/components/slider/slider.tsx
+++ b/src/components/slider/slider.tsx
@@ -54,6 +54,7 @@ export class Slider {
     }
 
     public componentDidUnload() {
+        this.mdcSlider.unlisten('MDCSlider:change', this.changeHandler);
         this.mdcSlider.destroy();
     }
 
diff --git a/src/components/snackbar/snackbar.tsx b/src/components/snackbar/snackbar.tsx
index 2b74e51cca..79c7f63d91 100644
--- a/src/components/snackbar/snackbar.tsx
+++ b/src/components/snackbar/snackbar.tsx
@@ -1,4 +1,7 @@
-import { MDCSnackbar } from '@lime-material-16px/snackbar';
+import {
+    MDCSnackbar,
+    MDCSnackbarCloseEvent,
+} from '@lime-material-16px/snackbar';
 import {
     Component,
     Element,
@@ -55,21 +58,20 @@ export class Snackbar {
 
     private mdcSnackbar: MDCSnackbar;
 
+    constructor() {
+        this.handleMdcClosing = this.handleMdcClosing.bind(this);
+    }
+
     public componentDidLoad() {
         this.mdcSnackbar = new MDCSnackbar(
             this.host.shadowRoot.querySelector('.mdc-snackbar')
         );
 
-        this.mdcSnackbar.listen('MDCSnackbar:closing', event => {
-            if (event.detail.reason === 'action') {
-                this.action.emit();
-            } else {
-                this.hide.emit();
-            }
-        });
+        this.mdcSnackbar.listen('MDCSnackbar:closing', this.handleMdcClosing);
     }
 
     public componentDidUnload() {
+        this.mdcSnackbar.unlisten('MDCSnackbar:closing', this.handleMdcClosing);
         this.mdcSnackbar.destroy();
     }
 
@@ -109,6 +111,14 @@ export class Snackbar {
         );
     }
 
+    private handleMdcClosing(event: MDCSnackbarCloseEvent) {
+        if (event.detail.reason === 'action') {
+            this.action.emit();
+        } else {
+            this.hide.emit();
+        }
+    }
+
     private renderAction(actionText) {
         if (actionText) {
             return (