Make showing the navigation button on DocumentControl configurable

src/Eto/Forms/ThemedControls/ThemedDocumentControlHandler.cs

@@ -8,6 +8,7 @@ public class ThemedDocumentControlHandler : ThemedContainerHandler<TableLayout,
 	List<DocumentPage> pages = new List<DocumentPage>();
 	ThemedDocumentPageHandler tabPrev, tabNext;
 
+	bool allowNavigationButtons;
 	PointF mousePos;
 	int selectedIndex;
 	float nextPrevWidth;
@@ -43,6 +44,21 @@ public Padding TabPadding
 		set => Widget.Properties.Set(TabPadding_Key, value, DefaultTabPadding);
 	}
 
+	/// <summary>
+	/// Gets or sets a value indicating the tabs can be navigated by next and previous buttons.
+	/// </summary>
+	/// <value><c>true</c> if can be navigated by next and previous buttons; otherwise, <c>false</c>.</value>
+	public bool AllowNavigationButtons
+	{
+		get { return allowNavigationButtons; }
+		set
+		{
+			allowNavigationButtons = value;
+			Calculate();
+			tabDrawable.Invalidate();
+		}
+	}
+
 	/// <summary>
 	/// Gets or sets the font for the tab text.
 	/// </summary>
@@ -206,6 +222,7 @@ public ThemedDocumentControlHandler()
 	{
 		mousePos = new PointF(-1, -1);
 		selectedIndex = -1;
+		allowNavigationButtons = true;
 		nextPrevWidth = 0;
 		startx = 0;
 		font = SystemFonts.Default();
@@ -541,7 +558,7 @@ void CalculateTabs(bool force = false)
 		if (!force && !Widget.Loaded)
 			return;
 		var posx = 0f;
-		if (nextPrevWidth == 0f)
+		if (allowNavigationButtons && nextPrevWidth == 0f)
 		{
 			CalculateTab(tabPrev, -1, ref posx);
 			CalculateTab(tabNext, -1, ref posx);
@@ -578,8 +595,11 @@ void Drawable_Paint(object sender, PaintEventArgs e)
 
 		posx = 0;
 
-		DrawTab(g, tabPrev, -1);
-		DrawTab(g, tabNext, -1);
+		if (allowNavigationButtons)
+		{
+			DrawTab(g, tabPrev, -1);
+			DrawTab(g, tabNext, -1);
+		}
 	}
 
 	void CalculateTab(ThemedDocumentPageHandler tab, int i, ref float posx)

test/Eto.Test/Sections/Controls/DocumentControlSection.cs

@@ -1,4 +1,6 @@
-namespace Eto.Test.Sections.Controls
+using Eto.Forms.ThemedControls;
+
+namespace Eto.Test.Sections.Controls
 {
 	[Section("Controls", typeof(DocumentControl))]
 	public class DocumentControlSection : Panel
@@ -29,7 +31,14 @@ public virtual Control Create()
 					new StackLayout
 					{
 						Orientation = Orientation.Horizontal,
-						Items = { AddPage(), RemovePage(), SelectPage(), allowReorder, enabled, null }
+						Items = {
+							AddPage(),
+							RemovePage(),
+							SelectPage(),
+							tabControl.Handler is ThemedDocumentControlHandler ? HasNavigationButtonsCheckBox() : null,
+							allowReorder,
+							enabled,
+							null }
 					},
 					new StackLayoutItem(tabControl, expand: true)
 				}
@@ -77,6 +86,15 @@ Control SelectPage()
 			return control;
 		}
 
+		Control HasNavigationButtonsCheckBox()
+		{
+			var control = new CheckBox { Text = "Has navigation buttons" };
+			control.Checked = ((ThemedDocumentControlHandler)tabControl.Handler).AllowNavigationButtons;
+			control.CheckedChanged += (sender, args) => ((ThemedDocumentControlHandler)tabControl.Handler).AllowNavigationButtons =
+				((CheckBox)sender).Checked ?? false;
+			return control;
+		}
+
 		DocumentControl DefaultTabs()
 		{
 			var control = CreateDocumentControl();