Update fill/clip enable on polygon only

Author: julzerinos

winforms-image-processor/winforms-image-processor/Forms/DrawForm.Designer.cs

@@ -117,6 +117,8 @@ void drawMode(
             if (!status && index == -1)
             {
                 shapes.Add(currentShape);
+                if (shapes.Count == 1)
+                    listBox1_SelectedIndexChanged(null, null);
                 RefreshShapes();
             }
             else if (!status)
@@ -286,6 +288,8 @@ private void button3_Click(object sender, EventArgs e)
 
             shapes.RemoveAt(listBox1.SelectedIndex);
 
+            listBox1_SelectedIndexChanged(null, null);
+
             RefreshShapes();
         }
 
@@ -311,7 +315,6 @@ private void openToolStripMenuItem_Click(object sender, EventArgs e)
             if (pictureBox1.Image == null)
                 pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
 
-
             var filePath = string.Empty;
 
             using (OpenFileDialog openFileDialog = new OpenFileDialog())
@@ -391,6 +394,24 @@ private void showClipBorderToolStripMenuItem_Click(object sender, EventArgs e)
             RefreshShapes();
         }
 
+        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
+        { 
+            if (shapes.Count < 1)
+            {
+                button4.Enabled = false;
+                button5.Enabled = false;
+                return;
+            }
 
+            if (listBox1.SelectedIndex == -1)
+            {
+                button4.Enabled = false;
+                button5.Enabled = false;
+                return;
+            }
+
+            button4.Enabled = (((Shape)listBox1.SelectedItem).shapeType == DrawingShape.POLY || ((Shape)listBox1.SelectedItem).shapeType == DrawingShape.CPOLY) ? true : false;
+            button5.Enabled = (((Shape)listBox1.SelectedItem).shapeType == DrawingShape.POLY || ((Shape)listBox1.SelectedItem).shapeType == DrawingShape.CPOLY) ? true : false;
+        }
     }
 }