From 8b2fb765f9f6b5086f0021b89fe0fcdde6306432 Mon Sep 17 00:00:00 2001
From: Guido Günther <agx@sigxcpu.org>
Date: Thu, 27 Dec 2012 17:38:17 +0100
Subject: Use signals to detect keyboard visibility changes

this makes sure button title and keyboard status are in sync.
---
 extension.js | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/extension.js b/extension.js
index 1a457fd..7d3d813 100644
--- a/extension.js
+++ b/extension.js
@@ -1,4 +1,5 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
 const Gio = imports.gi.Gio;
 const Lang = imports.lang;
 const St = imports.gi.St;
@@ -12,9 +13,23 @@ function OnScreenKeyboardButton() {
 
 OnScreenKeyboardButton.prototype = {
     _init: function() {
-        this.actor = new St.Button ({ label: 'Keyboard' });
+        this.actor = new St.Button ({ label: 'Show Keyboard' });
         this.actor.connect("clicked", Lang.bind(this, this._toggleShowOnScreenKeyboard));
         this._onScreenKeyboardShown = false;
+
+        this._keyboardVisibleId = Main.layoutManager.connect('keyboard-visible-changed',
+                                          Lang.bind(this,
+                                                    this._onKeyboardVisibleChanged));
+    },
+
+    _onKeyboardVisibleChanged: function (layoutManager, visible) {
+        if (visible) {
+            this.actor.set_label("Hide keyboard");
+            this._onScreenKeyboardShown = true;
+        } else {
+            this.actor.set_label("Show keyboard");
+            this._onScreenKeyboardShown = false;
+        }
     },
 
     _activateOnScreenKeyboard: function () {
@@ -29,14 +44,11 @@ OnScreenKeyboardButton.prototype = {
 
     _toggleShowOnScreenKeyboard: function() {
         if (this._onScreenKeyboardShown) {
-            this.actor.set_label("Show keyboard");
             Main.keyboard.hide();
         } else {
             this._activateOnScreenKeyboard();
-            this.actor.set_label("Hide keyboard");
             Main.keyboard.show();
         }
-        this._onScreenKeyboardShown = !this._onScreenKeyboardShown;
     },
 };
 
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