Enable/Disable Show Desktop button for #36

Settings.ui

@@ -1856,6 +1856,50 @@
                     </child>
                   </object>
                 </child>
+                <child>
+                  <object class="GtkListBoxRow" id="show_showdesktop_row">
+                    <property name="width_request">100</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <child>
+                      <object class="GtkGrid" id="show_showdesktop_button_grid">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="margin_left">12</property>
+                        <property name="margin_right">12</property>
+                        <property name="margin_top">12</property>
+                        <property name="margin_bottom">12</property>
+                        <property name="column_spacing">32</property>
+                        <child>
+                          <object class="GtkSwitch" id="show_showdesktop_button_switch">
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="halign">end</property>
+                            <property name="valign">center</property>
+                          </object>
+                          <packing>
+                            <property name="left_attach">1</property>
+                            <property name="top_attach">0</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkLabel" id="show_showdesktop_button_label">
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="hexpand">True</property>
+                            <property name="label" translatable="yes">Show Desktop Button</property>
+                            <property name="use_markup">True</property>
+                            <property name="xalign">0</property>
+                          </object>
+                          <packing>
+                            <property name="left_attach">0</property>
+                            <property name="top_attach">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                    </child>
+                  </object>
+                </child>
                 <child>
                   <object class="GtkListBoxRow" id="show_appmenu_row">
                     <property name="width_request">100</property>

panel.js

@@ -116,6 +116,7 @@ const dtpPanel = new Lang.Class({
         this._setActivitiesButtonVisible(this._dtpSettings.get_boolean('show-activities-button'));
         this._setAppmenuVisible(this._dtpSettings.get_boolean('show-appmenu'));
         this._setClockLocation(this._dtpSettings.get_string('location-clock'));
+        this._displayShowDesktopButton(this._dtpSettings.get_boolean('show-showdesktop-button'));
         
         this.panel.actor.add_style_class_name('dashtopanelMainPanel');
 
@@ -158,25 +159,6 @@ const dtpPanel = new Lang.Class({
             ]
         );
 
-        this._showDesktopButton = new St.Bin({ style_class: 'showdesktop-button',
-                          reactive: true,
-                          can_focus: true,
-                          x_fill: true,
-                          y_fill: true,
-                          track_hover: true });
-
-        this._showDesktopButton.connect('button-press-event', Lang.bind(this, this._onShowDesktopButtonPress));
-
-        this._showDesktopButton.connect('enter-event', Lang.bind(this, function(){
-            this._showDesktopButton.add_style_class_name('showdesktop-button-hovered');
-        }));
-        
-        this._showDesktopButton.connect('leave-event', Lang.bind(this, function(){
-            this._showDesktopButton.remove_style_class_name('showdesktop-button-hovered');
-        }));
-
-        this.panel._rightBox.insert_child_at_index(this._showDesktopButton, this.panel._rightBox.get_children().length);
-
         this._bindSettingsChanges();
 
         this.panelStyle.enable(this.panel);
@@ -234,10 +216,7 @@ const dtpPanel = new Lang.Class({
         Main.overview._panelGhost.set_height(this._oldPanelHeight);
         this._setActivitiesButtonVisible(true);
         this._setClockLocation("NATURAL");
-
-        this.panel.actor.remove_child(this._showDesktopButton);
-        this._showDesktopButton.destroy();
-        this._showDesktopButton = null;
+        this._displayShowDesktopButton(false);
 
         this.appMenu = null;
         this.container = null;
@@ -269,6 +248,10 @@ const dtpPanel = new Lang.Class({
         this._dtpSettings.connect('changed::location-clock', Lang.bind(this, function() {
             this._setClockLocation(this._dtpSettings.get_string('location-clock'));
         }));
+
+        this._dtpSettings.connect('changed::show-showdesktop-button', Lang.bind(this, function() {
+            this._displayShowDesktopButton(this._dtpSettings.get_boolean('show-showdesktop-button'));
+        }));
     },
 
     _allocate: function(actor, box, flags) {
@@ -420,6 +403,39 @@ const dtpPanel = new Lang.Class({
         }
     },
 
+    _displayShowDesktopButton: function (isVisible) {
+        if(isVisible) {
+            if(this._showDesktopButton)
+                return;
+
+            this._showDesktopButton = new St.Bin({ style_class: 'showdesktop-button',
+                            reactive: true,
+                            can_focus: true,
+                            x_fill: true,
+                            y_fill: true,
+                            track_hover: true });
+
+            this._showDesktopButton.connect('button-press-event', Lang.bind(this, this._onShowDesktopButtonPress));
+
+            this._showDesktopButton.connect('enter-event', Lang.bind(this, function(){
+                this._showDesktopButton.add_style_class_name('showdesktop-button-hovered');
+            }));
+            
+            this._showDesktopButton.connect('leave-event', Lang.bind(this, function(){
+                this._showDesktopButton.remove_style_class_name('showdesktop-button-hovered');
+            }));
+
+            this.panel._rightBox.insert_child_at_index(this._showDesktopButton, this.panel._rightBox.get_children().length);
+        } else {
+            if(!this._showDesktopButton)
+                return;
+
+            this.panel._rightBox.remove_child(this._showDesktopButton);
+            this._showDesktopButton.destroy();
+            this._showDesktopButton = null;
+        }
+    },
+
     _onShowDesktopButtonPress: function() {
         if(this._focusAppChangeId){
             tracker.disconnect(this._focusAppChangeId);

prefs.js

@@ -320,6 +320,10 @@ const Settings = new Lang.Class({
                             this._builder.get_object('show_activities_button_switch'),
                             'active',
                             Gio.SettingsBindFlags.DEFAULT);
+        this._settings.bind('show-showdesktop-button',
+                            this._builder.get_object('show_showdesktop_button_switch'),
+                            'active',
+                            Gio.SettingsBindFlags.DEFAULT);
         this._settings.bind('show-appmenu',
                             this._builder.get_object('show_appmenu_switch'),
                             'active',

schemas/org.gnome.shell.extensions.dash-to-panel.gschema.xml

@@ -142,6 +142,11 @@
       <summary>Show activities button</summary>
       <description>Show activities button on the left hand side of the taskbar</description>
     </key>
+    <key type="b" name="show-showdesktop-button">
+      <default>true</default>
+      <summary>Show desktop button</summary>
+      <description>Show button on right side of bar that minimizes/restores all visible windows on current workspace</description>
+    </key>
     <key type="b" name="show-appmenu">
       <default>false</default>
       <summary>Show appMenu</summary>