Add user settings for warn before exit

src/BasePlatform.ts

@@ -212,6 +212,18 @@ export default abstract class BasePlatform {
         throw new Error("Unimplemented");
     }
 
+    supportsWarnBeforeExit(): boolean {
+        return false;
+    }
+
+    async shouldWarnBeforeExit(): Promise<boolean> {
+        return false;
+    }
+
+    async setWarnBeforeExit(enabled: boolean): Promise<void> {
+        throw new Error("Unimplemented");
+    }
+
     supportsAutoHideMenuBar(): boolean {
         return false;
     }

src/components/views/settings/tabs/user/PreferencesUserSettingsTab.js

@@ -74,6 +74,8 @@ export default class PreferencesUserSettingsTab extends React.Component {
         this.state = {
             autoLaunch: false,
             autoLaunchSupported: false,
+            warnBeforeExit: true,
+            warnBeforeExitSupported: false,
             alwaysShowMenuBar: true,
             alwaysShowMenuBarSupported: false,
             minimizeToTray: true,
@@ -96,6 +98,12 @@ export default class PreferencesUserSettingsTab extends React.Component {
             autoLaunch = await platform.getAutoLaunchEnabled();
         }
 
+        const warnBeforeExitSupported = await platform.supportsWarnBeforeExit();
+        let warnBeforeExit = false;
+        if (warnBeforeExitSupported) {
+            warnBeforeExit = await platform.shouldWarnBeforeExit();
+        }
+
         const alwaysShowMenuBarSupported = await platform.supportsAutoHideMenuBar();
         let alwaysShowMenuBar = true;
         if (alwaysShowMenuBarSupported) {
@@ -111,6 +119,8 @@ export default class PreferencesUserSettingsTab extends React.Component {
         this.setState({
             autoLaunch,
             autoLaunchSupported,
+            warnBeforeExit,
+            warnBeforeExitSupported,
             alwaysShowMenuBarSupported,
             alwaysShowMenuBar,
             minimizeToTraySupported,
@@ -122,6 +132,10 @@ export default class PreferencesUserSettingsTab extends React.Component {
         PlatformPeg.get().setAutoLaunchEnabled(checked).then(() => this.setState({autoLaunch: checked}));
     };
 
+    _onWarnBeforeExitChange = (checked) => {
+        PlatformPeg.get().setWarnBeforeExit(checked).then(() => this.setState({warnBeforeExit: checked}));
+    }
+
     _onAlwaysShowMenuBarChange = (checked) => {
         PlatformPeg.get().setAutoHideMenuBarEnabled(!checked).then(() => this.setState({alwaysShowMenuBar: checked}));
     };
@@ -161,6 +175,14 @@ export default class PreferencesUserSettingsTab extends React.Component {
                 label={_t('Start automatically after system login')} />;
         }
 
+        let warnBeforeExitOption = null;
+        if (this.state.warnBeforeExitSupported) {
+            warnBeforeExitOption = <LabelledToggleSwitch
+                value={this.state.warnBeforeExit}
+                onChange={this._onWarnBeforeExitChange}
+                label={_t('Warn before quitting')} />;
+        }
+
         let autoHideMenuOption = null;
         if (this.state.alwaysShowMenuBarSupported) {
             autoHideMenuOption = <LabelledToggleSwitch
@@ -202,6 +224,7 @@ export default class PreferencesUserSettingsTab extends React.Component {
                     {minimizeToTrayOption}
                     {autoHideMenuOption}
                     {autoLaunchOption}
+                    {warnBeforeExitOption}
                     <Field
                         label={_t('Autocomplete delay (ms)')}
                         type='number'

src/i18n/strings/en_EN.json

@@ -1286,6 +1286,7 @@
     "Room ID or address of ban list": "Room ID or address of ban list",
     "Subscribe": "Subscribe",
     "Start automatically after system login": "Start automatically after system login",
+    "Warn before quitting": "Warn before quitting",
     "Always show the window menu bar": "Always show the window menu bar",
     "Show tray icon and minimize window to it on close": "Show tray icon and minimize window to it on close",
     "Preferences": "Preferences",