Merge pull request #67 from csmoore/master

Support for `"display=none"` #66

Source/Basic Shapes/SvgImage.cs

@@ -97,6 +97,9 @@ namespace Svg
         /// </summary>
         protected override void Render(SvgRenderer renderer)
         {
+            if (!Visible || !Displayable)
+                return;
+
             if (Width.Value > 0.0f && Height.Value > 0.0f && this.Href != null)
             {
                 using (Image b = GetImage(this.Href))

Source/Basic Shapes/SvgVisualElement.cs

@@ -94,7 +94,7 @@ namespace Svg
         /// <param name="renderer">The <see cref="SvgRenderer"/> object to render to.</param>
         protected override void Render(SvgRenderer renderer)
         {
-            if (this.Path != null && this.Visible)
+            if ((this.Path != null) && this.Visible && this.Displayable)
             {
                 this.PushTransforms(renderer);
                 this.SetClip(renderer);

Source/Basic Shapes/SvgVisualElementStyle.cs

@@ -26,6 +26,30 @@ namespace Svg
             set { this.Attributes["visibility"] = value; }
         }
 
+        /// <summary>
+        /// Gets or sets a value to determine whether the element will be rendered.
+        /// Needed to support SVG attribute display="none"
+        /// </summary>
+        [SvgAttribute("display")]
+        public virtual string Display
+        {
+            get { return this.Attributes["display"] as string; }
+            set { this.Attributes["display"] = value; }
+        }
+
+        // Displayable - false if attribute display="none", true otherwise
+        protected virtual bool Displayable
+        {
+            get
+            {
+                string checkForDisplayNone = this.Attributes["display"] as string;
+                if ((!string.IsNullOrEmpty(checkForDisplayNone)) && (checkForDisplayNone == "none"))
+                    return false;
+                else
+                    return true;
+            }
+        }
+
         /// <summary>
         /// Gets or sets the fill <see cref="SvgPaintServer"/> of this element.
         /// </summary>

Source/Document Structure/SvgGroup.cs

@@ -68,6 +68,9 @@ namespace Svg
         /// <param name="graphics">The <see cref="Graphics"/> object to render to.</param>
         protected override void Render(SvgRenderer renderer)
         {
+            if (!Visible || !Displayable)
+                return;
+
             this.PushTransforms(renderer);
             this.SetClip(renderer);
             base.RenderChildren(renderer);

Source/Document Structure/SvgUse.cs

@@ -80,6 +80,9 @@ namespace Svg
 
         protected override void Render(SvgRenderer renderer)
         {
+            if (!Visible || !Displayable)
+                return;
+
             this.PushTransforms(renderer);
 
             SvgVisualElement element = (SvgVisualElement)this.OwnerDocument.IdManager.GetElementById(this.ReferencedElement);

Source/Painting/EnumConverters.cs

@@ -44,7 +44,13 @@ namespace Svg
 				throw new ArgumentOutOfRangeException("value must be a string.");
 			}
 
-			return (string)value == "visible" ? true : false;
+			// Note: currently only used by SvgVisualElement.Visible but if
+			// conversion is used elsewhere these checks below will need to change
+			string visibility = (string)value;
+			if ((visibility == "hidden") || (visibility == "collapse"))
+				return false;
+			else
+				return true;
         }
 		
 		public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)