modified datagrid style

RowHeight, ColumnHeaderHeight, ShowSelectAllButton

src/Shared/HandyControl_Shared/Tools/Converter/DataGridSelectAllButtonVisibilityConverter.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace HandyControl.Tools.Converter
+{
+    public class DataGridSelectAllButtonVisibilityConverter : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values == null)
+            {
+                return Visibility.Collapsed;
+            }
+
+            if (values.Length != 2)
+            {
+                return Visibility.Collapsed;
+            }
+
+            if (values[0] is DataGridHeadersVisibility headersVisibility)
+            {
+                if (values[1] is bool showButton)
+                {
+                    if (headersVisibility == DataGridHeadersVisibility.All)
+                    {
+                        return showButton ? Visibility.Visible : Visibility.Collapsed;
+                    }
+
+                    return Visibility.Collapsed;
+                }
+
+                return Visibility.Collapsed;
+            }
+            else if (values[0] is bool showButton)
+            {
+                if (values[1] is DataGridHeadersVisibility visibility)
+                {
+                    if (visibility == DataGridHeadersVisibility.All)
+                    {
+                        return showButton ? Visibility.Visible : Visibility.Collapsed;
+                    }
+
+                    return Visibility.Collapsed;
+                }
+
+                return Visibility.Collapsed;
+            }
+
+            return Visibility.Collapsed;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}