From 27736261bdb626e0c30884edc1b699c9fe5ed256 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 15 Aug 2018 15:03:56 +0200
Subject: [PATCH 2/2] endSessionDialog: Support rebooting into the bootloader
 menu aka ("Boot Options")

This implements the "Alt" behavior for the "Reboot" button as outlined in
the design here: https://wiki.gnome.org/Design/OS/BootOptions

This causes the endSessionDialog to send a ConfirmedRebootToBootOptions signal
to gnome-session instead of the normal ConfirmedReboot signal, actually
telling the boot-loader that it should show its menu the next boot is left
up to gnome-session.

Note I've tried implemeting this with the AltSwitcher class from
js/ui/status/system.js first, but that puts the button in a St.Bin()
which causes the button to think it is the only button on the dialog
and makes it have rounded corners on both of its bottom corners.
---
 js/ui/endSessionDialog.js | 51 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/js/ui/endSessionDialog.js b/js/ui/endSessionDialog.js
index 4ce797527..c18a008eb 100644
--- a/js/ui/endSessionDialog.js
+++ b/js/ui/endSessionDialog.js
@@ -254,6 +254,9 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
         this._totalSecondsToStayOpen = 0;
         this._applications = [];
         this._sessions = [];
+        this._capturedEventId = 0;
+        this._rebootButton = null;
+        this._rebootButtonAlt = null;
 
         this.connect('destroy',
                      this._onDestroy.bind(this));
@@ -440,6 +443,26 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
         this._sessionHeader.visible = hasSessions;
     }
 
+    _onCapturedEvent(actor, event) {
+        let altEnabled = false;
+
+        let type = event.type();
+        if (type != Clutter.EventType.KEY_PRESS && type != Clutter.EventType.KEY_RELEASE)
+            return Clutter.EVENT_PROPAGATE;
+
+        let key = event.get_key_symbol();
+        if (key != Clutter.KEY_Alt_L && key != Clutter.KEY_Alt_R)
+            return Clutter.EVENT_PROPAGATE;
+
+        if (type == Clutter.EventType.KEY_PRESS)
+            altEnabled = true;
+
+        this._rebootButton.visible = !altEnabled;
+        this._rebootButtonAlt.visible = altEnabled;
+
+        return Clutter.EVENT_PROPAGATE;
+    }
+
     _updateButtons() {
         this.clearButtons();
 
@@ -461,7 +484,33 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
                 },
                 label: label,
             });
+
+            // Add Alt "Boot Options" option to the Reboot button
+            if (signal == 'ConfirmedReboot') {
+                this._rebootButton = button;
+                this._rebootButtonAlt = this.addButton({
+                    action: () => {
+                        this.close(true);
+                        let signalId = this.connect('closed', () => {
+                            this.disconnect(signalId);
+                            this._confirm('ConfirmedRebootToBootOptions');
+                        });
+                    },
+                    label: C_("button", "Boot Options")
+                });
+                this._rebootButtonAlt.visible = false;
+                this._capturedEventId = global.stage.connect('captured-event', this._onCapturedEvent.bind(this));
+            }
+        }
+    }
+
+    _stopAltCapture() {
+        if (this._capturedEventId > 0) {
+            global.stage.disconnect(this._capturedEventId);
+            this._capturedEventId = 0;
         }
+        this._rebootButton = null;
+        this._rebootButtonAlt = null;
     }
 
     close(skipSignal) {
@@ -473,6 +522,7 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
 
     cancel() {
         this._stopTimer();
+        this._stopAltCapture();
         this._dbusImpl.emit_signal('Canceled', null);
         this.close();
     }
@@ -481,6 +531,7 @@ class EndSessionDialog extends ModalDialog.ModalDialog {
         let callback = () => {
             this._fadeOutDialog();
             this._stopTimer();
+            this._stopAltCapture();
             this._dbusImpl.emit_signal(signal, null);
         };
 
-- 
2.23.0