optimize<Diff,Blame>: optimize layout calculation

src/UI/Blame.xaml

@@ -107,8 +107,8 @@
             </Border>
 
             <!-- Content -->
-            <Border Grid.Row="2" x:Name="area" BorderThickness="1" BorderBrush="{StaticResource Brush.Border2}" ClipToBounds="True" SizeChanged="ContentSizeChanged">
-                <Grid>
+            <Border Grid.Row="2" BorderThickness="1" BorderBrush="{StaticResource Brush.Border2}" ClipToBounds="True">
+                <Grid x:Name="area" SizeChanged="OnSizeChanged">
                     <Grid.Resources>
                         <Style x:Key="Style.DataGridText.LineNumber" TargetType="{x:Type TextBlock}">
                             <Setter Property="FontFamily" Value="Consolas"/>
@@ -116,13 +116,7 @@
                             <Setter Property="HorizontalAlignment" Value="Right"/>
                             <Setter Property="VerticalAlignment" Value="Center"/>
                             <Setter Property="Padding" Value="8,0"/>
-                        </Style>
-
-                        <Style x:Key="Style.DataGridText.Block" TargetType="{x:Type TextBlock}">
-                            <Setter Property="FontFamily" Value="Consolas"/>
-                            <Setter Property="Foreground" Value="{StaticResource Brush.FG}"/>
-                            <Setter Property="VerticalAlignment" Value="Center"/>
-                            <Setter Property="Padding" Value="0"/>
+                            <Setter Property="FontSize" Value="12"/>
                         </Style>
                     </Grid.Resources>
                     
@@ -133,7 +127,9 @@
                         GridLinesVisibility="Vertical"
                         VerticalGridLinesBrush="{StaticResource Brush.Border2}"
                         FrozenColumnCount="1"
+                        RowHeight="16"
                         SelectionUnit="FullRow"
+                        FontFamily="Consolas"
                         SelectionMode="Single">
 
                         <DataGrid.RowStyle>
@@ -146,7 +142,7 @@
                         <DataGrid.Columns>
                             <DataGridTextColumn Width="Auto" IsReadOnly="True" Binding="{Binding LineNumber}" ElementStyle="{StaticResource Style.DataGridText.LineNumber}"/>
 
-                            <DataGridTemplateColumn Width="1" MinWidth="1" IsReadOnly="True">
+                            <DataGridTemplateColumn Width="SizeToCells" MinWidth="1" IsReadOnly="True">
                                 <DataGridTemplateColumn.CellTemplate>
                                     <DataTemplate>
                                         <Grid>

src/UI/Blame.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
@@ -86,10 +87,23 @@ namespace SourceGit.UI {
                     loading.RenderTransform.BeginAnimation(RotateTransform.AngleProperty, null);
                     loading.Visibility = Visibility.Collapsed;
 
+                    var formatted = new FormattedText(
+                        $"{records.Count}",
+                        CultureInfo.CurrentCulture,
+                        FlowDirection.LeftToRight,
+                        new Typeface(blame.FontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
+                        12.0,
+                        Brushes.Black);
+
+                    var lineNumberWidth = formatted.Width + 16;
+                    var minWidth = area.ActualWidth - lineNumberWidth;
+
+                    if (records.Count * 16 > area.ActualHeight) minWidth -= 8;
+
+                    blame.Columns[0].Width = lineNumberWidth;
+                    blame.Columns[1].MinWidth = minWidth;
                     blame.ItemsSource = records;
                     blame.UpdateLayout();
-
-                    ContentSizeChanged(null, null);
                 });
             });
         }
@@ -151,10 +165,10 @@ namespace SourceGit.UI {
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
-        private void ContentSizeChanged(object sender, SizeChangedEventArgs e) {
+        private void OnSizeChanged(object sender, SizeChangedEventArgs e) {
             var total = area.ActualWidth;
             var offset = blame.NonFrozenColumnsViewportHorizontalOffset;
-            var minWidth = total - offset - 2;
+            var minWidth = total - offset;
 
             var scroller = GetVisualChild<ScrollViewer>(blame);
             if (scroller.ComputedVerticalScrollBarVisibility == Visibility.Visible) minWidth -= 8;

src/UI/DiffViewer.xaml.cs

@@ -162,16 +162,12 @@ namespace SourceGit.UI {
                     loading.Visibility = Visibility.Collapsed;
                     textChangeOptions.Visibility = Visibility.Visible;
 
-                    var formatted = new FormattedText(
-                        lastOldLine + lastNewLine,
-                        CultureInfo.CurrentCulture,
-                        FlowDirection.LeftToRight,
-                        new Typeface(FontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
-                        12.0,
-                        fgCommon);
-
-                    var minWidth = editorContainer.ActualWidth - formatted.Width - 16 - 8;
+                    var lineNumberWidth = CalcLineNumberColWidth(lastOldLine, lastNewLine);
+                    var minWidth = editorContainer.ActualWidth - lineNumberWidth * 2;
+                    if (editorContainer.ActualHeight < lineChanges.Count * 16) minWidth -= 8;
                     var editor = CreateTextEditor(new string[] { "OldLine", "NewLine" });
+                    editor.Columns[0].Width = new DataGridLength(lineNumberWidth, DataGridLengthUnitType.Pixel);
+                    editor.Columns[1].Width = new DataGridLength(lineNumberWidth, DataGridLengthUnitType.Pixel);
                     editor.Columns[2].MinWidth = minWidth;
                     editor.ItemsSource = blocks;
                     editor.SetValue(Grid.ColumnSpanProperty, 2);
@@ -233,29 +229,22 @@ namespace SourceGit.UI {
                     loading.Visibility = Visibility.Collapsed;
                     textChangeOptions.Visibility = Visibility.Visible;
 
-                    var number = lastOldLine;
-                    if (lastOldLine.Length > lastNewLine.Length) number = lastNewLine;
-
-                    var formatted = new FormattedText(
-                        number,
-                        CultureInfo.CurrentCulture,
-                        FlowDirection.LeftToRight,
-                        new Typeface(FontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
-                        12.0,
-                        fgCommon);
-
-                    var minWidth = editorContainer.ActualWidth / 2 - formatted.Width - 16 - 8;
+                    var lineNumberWidth = CalcLineNumberColWidth(lastOldLine, lastNewLine);
+                    var minWidth = editorContainer.ActualWidth / 2 - lineNumberWidth;
+                    if (editorContainer.ActualHeight < lineChanges.Count * 16) minWidth -= 8;
 
                     var oldEditor = CreateTextEditor(new string[] { "OldLine" });
                     oldEditor.SetValue(Grid.ColumnProperty, 0);
                     oldEditor.ContextMenuOpening += OnTextChangeContextMenuOpening;
                     oldEditor.AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(OnTwoSidesScroll));
+                    oldEditor.Columns[0].Width = new DataGridLength(lineNumberWidth, DataGridLengthUnitType.Pixel);
                     oldEditor.Columns[1].MinWidth = minWidth;
                     oldEditor.ItemsSource = oldSideBlocks;
                     var newEditor = CreateTextEditor(new string[] { "NewLine" });
                     newEditor.SetValue(Grid.ColumnProperty, 1);
                     newEditor.ContextMenuOpening += OnTextChangeContextMenuOpening;
                     newEditor.AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(OnTwoSidesScroll));
+                    newEditor.Columns[0].Width = new DataGridLength(lineNumberWidth, DataGridLengthUnitType.Pixel);
                     newEditor.Columns[1].MinWidth = minWidth;
                     newEditor.ItemsSource = newSideBlocks;
 
@@ -354,9 +343,15 @@ namespace SourceGit.UI {
             return child;
         }
 
+        /// <summary>
+        ///     Create text editor.
+        /// </summary>
+        /// <param name="lineNumbers"></param>
+        /// <returns></returns>
         private DataGrid CreateTextEditor(string[] lineNumbers) {
             var grid = new DataGrid();
             grid.SetValue(Grid.RowProperty, 1);
+            grid.RowHeight = 16.0;
             grid.GridLinesVisibility = DataGridGridLinesVisibility.Vertical;
             grid.VerticalGridLinesBrush = FindResource("Brush.Border2") as Brush;
             grid.FrozenColumnCount = lineNumbers.Length;
@@ -365,7 +360,6 @@ namespace SourceGit.UI {
 
             foreach (var number in lineNumbers) {
                 var colLineNumber = new DataGridTextColumn();
-                colLineNumber.Width = DataGridLength.Auto;
                 colLineNumber.IsReadOnly = true;
                 colLineNumber.Binding = new Binding(number);
                 colLineNumber.ElementStyle = FindResource("Style.DataGridText.LineNumber") as Style;
@@ -396,6 +390,27 @@ namespace SourceGit.UI {
 
             return grid;
         }
+
+        /// <summary>
+        ///     Calculate max width for line number column.
+        /// </summary>
+        /// <param name="oldLine"></param>
+        /// <param name="newLine"></param>
+        /// <returns></returns>
+        private double CalcLineNumberColWidth(string oldLine, string newLine) {
+            var number = oldLine;
+            if (newLine.Length > oldLine.Length) number = newLine;
+
+            var formatted = new FormattedText(
+                number,
+                CultureInfo.CurrentCulture,
+                FlowDirection.LeftToRight,
+                new Typeface(FontFamily, FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
+                12.0,
+                Brushes.Black);
+
+            return formatted.Width + 16;
+        }
         #endregion
 
         #region EVENTS