Add a new multiline TextArea widget

TestApps/Samples/Samples/TextEntries.cs

@@ -106,22 +106,42 @@ public TextEntries ()
 			te5.PlaceholderText = "Placeholder text";
 			PackStart (te5);
 
-			TextEntry te6 = new TextEntry ();
-			te6.Text = "I should have" + Environment.NewLine + "multiple lines!";
-			te6.PlaceholderText = "Placeholder text";
-			te6.MultiLine = true;
-			te6.MinHeight = 40;
-			PackStart (te6);
+			HBox hbox1 = new HBox ();
+
+			TextArea ta1 = new TextArea ();
+			ta1.Text = "I should have" + Environment.NewLine + "multiple lines and be centered!";
+			ta1.PlaceholderText = "Placeholder text";
+			ta1.TextAlignment = Alignment.Center;
+			ta1.MinHeight = 40;
+			ta1.Activated += (sender, e) => MessageDialog.ShowMessage ("Activated");
+			hbox1.PackStart (ta1, true);
+
+			TextArea ta2 = new TextArea ();
+			ta2.Text = "I should have multiple lines," + Environment.NewLine + "no frame and should wrap on words!";
+			ta2.PlaceholderText = "Placeholder text";
+			ta2.ShowFrame = false;
+			ta2.Wrap = WrapMode.Word;
+			hbox1.PackStart (ta2, true);
+
+			PackStart (hbox1);
+
+			TextArea ta3 = new TextArea ();
+			ta3.Text = "I should have\nmultiple lines,\nwrap on words,\n and scroll\nvertically ";
+			ta3.PlaceholderText = "Placeholder text";
+			ta3.Wrap = WrapMode.Word;
+			var scrollTa3 = new ScrollView (ta3);
+			scrollTa3.HorizontalScrollPolicy = ScrollPolicy.Never;
+			PackStart (scrollTa3);
 
 			try {
-				SearchTextEntry te7 = new SearchTextEntry ();
-				te7.PlaceholderText = "Type to search ...";
-				PackStart (te7);
-
-				SearchTextEntry te8 = new SearchTextEntry ();
-				te8.PlaceholderText = "I should have no frame";
-				te8.ShowFrame = false;
-				PackStart (te8);
+				SearchTextEntry ts1 = new SearchTextEntry ();
+				ts1.PlaceholderText = "Type to search ...";
+				PackStart (ts1);
+
+				SearchTextEntry ts2 = new SearchTextEntry ();
+				ts2.PlaceholderText = "I should have no frame";
+				ts2.ShowFrame = false;
+				PackStart (ts2);
 			} catch (InvalidOperationException ex) {
 				Console.WriteLine (ex);
 			}

Xwt.Gtk/Xwt.Gtk.csproj

@@ -164,6 +164,8 @@
     <Compile Include="Xwt.GtkBackend\AccessibleBackend.cs" />
     <Compile Include="Xwt.GtkBackend\PopupWindowBackend.cs" />
     <Compile Include="Xwt.GtkBackend\UtilityWindowBackend.cs" />
+    <Compile Include="Xwt.GtkBackend\TextAreaBackend.cs" />
+    <Compile Include="Xwt.GtkBackend\TextAreaBackendGtk2.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Xwt.Gtk/Xwt.Gtk3.csproj

@@ -165,6 +165,8 @@
     <Compile Include="Xwt.GtkBackend\AccessibleBackend.cs" />
     <Compile Include="Xwt.GtkBackend\PopupWindowBackend.cs" />
     <Compile Include="Xwt.GtkBackend\UtilityWindowBackend.cs" />
+    <Compile Include="Xwt.GtkBackend\TextAreaBackend.cs" />
+    <Compile Include="Xwt.GtkBackend\TextAreaBackendGtk3.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

Xwt.Gtk/Xwt.GtkBackend/Conversion.cs

@@ -177,6 +177,26 @@ public static GridLines ToXwtValue (this Gtk.TreeViewGridLines value)
 			throw new InvalidOperationException("Invalid TreeViewGridLines value: " + value);
 		}
 
+		public static Gtk.Justification ToGtkJustification (this Alignment value)
+		{
+			switch (value) {
+				case Alignment.Start: return Gtk.Justification.Left;
+				case Alignment.Center: return Gtk.Justification.Center;
+				case Alignment.End: return Gtk.Justification.Right;
+			}
+			throw new InvalidOperationException("Invalid Alignment value: " + value);
+		}
+
+		public static Alignment ToXwtValue (this Gtk.Justification value)
+		{
+			switch (value) {
+				case Gtk.Justification.Left: return Alignment.Start;
+				case Gtk.Justification.Center: return Alignment.Center;
+				case Gtk.Justification.Right: return Alignment.End;
+			}
+			return Alignment.Start; // return Start for unknown and Fill
+		}
+
 		public static float ToGtkAlignment(this Alignment alignment)
 		{
 			switch(alignment) {

Xwt.Gtk/Xwt.GtkBackend/Gtk2Extensions.cs

@@ -206,6 +206,20 @@ public static void RenderPlaceholderText (this Gtk.Entry entry, Gtk.ExposeEventA
 			RenderPlaceholderText_internal (entry, args, placeHolderText, ref layout, entry.Xalign, 0.5f, 1, 0);
 		}
 
+		public static void RenderPlaceholderText (this Gtk.TextView textView, Gtk.ExposeEventArgs args, string placeHolderText, ref Pango.Layout layout)
+		{
+			if (args.Event.Window != textView.GetWindow (Gtk.TextWindowType.Text))
+				return;
+			if (textView.Buffer.Text.Length > 0)
+				return;
+			float xalign = 0;
+			switch (textView.Justification) {
+				case Gtk.Justification.Center: xalign = 0.5f; break;
+				case Gtk.Justification.Right: xalign = 1; break;
+			}
+			RenderPlaceholderText_internal (textView, args, placeHolderText, ref layout, xalign, 0.0f, 3, 0);
+		}
+
 		static void RenderPlaceholderText_internal (Gtk.Widget widget, Gtk.ExposeEventArgs args, string placeHolderText, ref Pango.Layout layout, float xalign, float yalign, int xpad, int ypad)
 		{
 			if (layout == null) {

Xwt.Gtk/Xwt.GtkBackend/Gtk3Extensions.cs

@@ -25,6 +25,7 @@
 // THE SOFTWARE.
 
 using Xwt.Backends;
+using Xwt.CairoBackend;
 using System;
 using System.Runtime.InteropServices;
 using Gtk;
@@ -239,6 +240,36 @@ public static double GetSliderPosition (this Gtk.Scale scale)
 			scale.GetSliderRange (out start, out end);
 			return start + ((end - start) / 2);
 		}
+
+		public static void RenderPlaceholderText (this Gtk.TextView textView, Cairo.Context cr, string placeHolderText, ref Pango.Layout layout)
+		{
+			if (textView.Buffer.Text.Length > 0 || textView.HasFocus)
+				return;
+			float xalign = 0;
+			switch (textView.Justification) {
+				case Gtk.Justification.Center: xalign = 0.5f; break;
+				case Gtk.Justification.Right: xalign = 1; break;
+			}
+			RenderPlaceholderText_internal (textView, cr, placeHolderText, ref layout, xalign, 0.0f, 3, 0);
+		}
+
+		static void RenderPlaceholderText_internal (Gtk.Widget widget, Cairo.Context cr, string placeHolderText, ref Pango.Layout layout, float xalign, float yalign, int xpad, int ypad)
+		{
+			if (layout == null) {
+				layout = new Pango.Layout (widget.PangoContext);
+				layout.FontDescription = widget.PangoContext.FontDescription.Copy ();
+			}
+			int width, height;
+			layout.SetText (placeHolderText);
+			layout.GetPixelSize (out width, out height);
+			int x = xpad + (int)((widget.AllocatedWidth - width) * xalign);
+			int y = ypad + (int)((widget.AllocatedHeight - height) * yalign);
+			Xwt.Drawing.Color color_a = widget.StyleContext.GetBackgroundColor (Gtk.StateFlags.Normal).ToXwtValue ();
+			Xwt.Drawing.Color color_b = widget.StyleContext.GetColor (Gtk.StateFlags.Normal).ToXwtValue ();
+			cr.SetSourceColor (color_b.BlendWith (color_a, 0.5).ToCairoColor ());
+			cr.MoveTo (x, y);
+			Pango.CairoHelper.ShowLayout (cr, layout);
+		}
 	}
 }
 

Xwt.Gtk/Xwt.GtkBackend/GtkEngine.cs

@@ -72,6 +72,7 @@ public override void InitializeBackends ()
 			RegisterBackend<IDesignerSurfaceBackend, DesignerSurfaceBackend> ();
 			RegisterBackend<IMenuButtonBackend, MenuButtonBackend> ();
 			RegisterBackend<ITextEntryBackend, TextEntryBackend> ();
+			RegisterBackend<ITextAreaBackend, TextAreaBackend> ();
 			RegisterBackend<IToggleButtonBackend, ToggleButtonBackend> ();
 			RegisterBackend<IImageViewBackend, ImageViewBackend> ();
 			RegisterBackend<IAlertDialogBackend, AlertDialogBackend> ();