refactor<Exception>: add context to exception to filter exceptions; each page has it's own error display control

src/App.xaml.cs

@@ -8,6 +8,7 @@ namespace SourceGit {
     ///     程序入口.
     /// </summary>
     public partial class App : Application {
+        public static event Action<string, string> ExceptionRaised;
 
         /// <summary>
         ///     读取本地化字串
@@ -21,6 +22,15 @@ namespace SourceGit {
             return string.Format(data, args);
         }
 
+        /// <summary>
+        ///     触发错误
+        /// </summary>
+        /// <param name="ctx">错误上下文</param>
+        /// <param name="detail">错误内容</param>
+        public static void Exception(string ctx, string detail) {
+            ExceptionRaised?.Invoke(ctx, detail);
+        }
+
         /// <summary>
         ///     启动.
         /// </summary>

src/Commands/Command.cs

@@ -178,7 +178,7 @@ namespace SourceGit.Commands {
         /// </summary>
         /// <param name="message"></param>
         public virtual void OnException(string message) {
-            Models.Exception.Raise(message);
+            App.Exception(Cwd, message);
         }
     }
 }

src/Models/Exception.cs

@@ -1,15 +0,0 @@
-using System;
-
-namespace SourceGit.Models {
-
-    /// <summary>
-    ///     错误通知
-    /// </summary>
-    public static class Exception {
-        public static Action<string> Handler { get; set; }
-
-        public static void Raise(string error) {
-            Handler?.Invoke(error);
-        }
-    }
-}

src/Views/Clone.xaml.cs

@@ -63,7 +63,7 @@ namespace SourceGit.Views {
                 }
 
                 if (!Directory.Exists(path)) {
-                    Models.Exception.Raise($"Folder {path} not found!");
+                    Dispatcher.Invoke(() => txtError.Text = $"Folder {path} not found!");
                     return false;
                 }
 

src/Views/Launcher.xaml

@@ -70,11 +70,5 @@
 
         <!-- Contents -->
         <controls:PageContainer x:Name="container" Grid.Row="1"/>
-
-        <!-- Alerts -->
-        <widgets:Exceptions
-            Grid.Row="1" 
-            HorizontalAlignment="Right" VerticalAlignment="Top"
-            Width="330" Height="Auto"/>
     </Grid>
 </controls:Window>

src/Views/Popups/AddSubTree.xaml.cs

@@ -34,7 +34,7 @@ namespace SourceGit.Views.Popups {
 
             var squash = chkSquash.IsChecked == true;
             if (repo.SubTrees.FindIndex(x => x.Prefix == Prefix) >= 0) {
-                Models.Exception.Raise($"Subtree add failed. Prefix({Prefix}) already exists!");
+                App.Exception(repo.Path, $"Subtree add failed. Prefix({Prefix}) already exists!");
                 return null;
             }
 

src/Views/Popups/FastForwardWithoutCheckout.xaml.cs

@@ -14,7 +14,7 @@ namespace SourceGit.Views.Popups {
         public FastForwardWithoutCheckout(string repo, string branch, string upstream) {
             int idx = upstream.IndexOf('/');
             if (idx < 0 || idx == upstream.Length - 1) {
-                Models.Exception.Raise($"Invalid upstream: {upstream}");
+                App.Exception(repo, $"Invalid upstream: {upstream}");
                 return;
             }
 

src/Views/Widgets/Dashboard.xaml

@@ -1,4 +1,5 @@
 <UserControl x:Class="SourceGit.Views.Widgets.Dashboard"
+             x:Name="me"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
@@ -592,5 +593,12 @@
                 </Grid>
             </Border>
         </Grid>
+
+        <!-- Alerts -->
+        <widgets:Exceptions
+            Grid.Row="1" 
+            HorizontalAlignment="Right" VerticalAlignment="Top"
+            Width="330" Height="Auto"
+            Context="{Binding ElementName=me, Path=ExceptionContext}"/>
     </Grid>
 </UserControl>

src/Views/Widgets/Dashboard.xaml.cs

@@ -54,6 +54,8 @@ namespace SourceGit.Views.Widgets {
             }
         }
 
+        public string ExceptionContext => repo.Path;
+
         public Dashboard(Models.Repository repo) {
             this.repo = repo;
 
@@ -402,7 +404,7 @@ namespace SourceGit.Views.Widgets {
         private void OpenInTerminal(object sender, RoutedEventArgs e) {
             var bash = Path.Combine(Models.Preference.Instance.Git.Path, "..", "bash.exe");
             if (!File.Exists(bash)) {
-                Models.Exception.Raise(App.Text("MissingBash"));
+                App.Exception(repo.Path, App.Text("MissingBash"));
                 return;
             }
 
@@ -428,7 +430,7 @@ namespace SourceGit.Views.Widgets {
 
         private void OpenFetch(object sender, RoutedEventArgs e) {
             if (repo.Remotes.Count == 0) {
-                Models.Exception.Raise("No remotes added to this repository!!!");
+                App.Exception(repo.Path, "No remotes added to this repository!!!");
                 return;
             }
 
@@ -438,7 +440,7 @@ namespace SourceGit.Views.Widgets {
 
         private void OpenPull(object sender, RoutedEventArgs e) {
             if (repo.Remotes.Count == 0) {
-                Models.Exception.Raise("No remotes added to this repository!!!");
+                App.Exception(repo.Path, "No remotes added to this repository!!!");
                 return;
             }
 
@@ -448,7 +450,7 @@ namespace SourceGit.Views.Widgets {
 
         private void OpenPush(object sender, RoutedEventArgs e) {
             if (repo.Remotes.Count == 0) {
-                Models.Exception.Raise("No remotes added to this repository!!!");
+                App.Exception(repo.Path, "No remotes added to this repository!!!");
                 return;
             }
 
@@ -576,7 +578,7 @@ namespace SourceGit.Views.Widgets {
             if (current != null) {
                 new Popups.CreateBranch(repo, current).Show();
             } else {
-                Models.Exception.Raise(App.Text("CreateBranch.Idle"));
+                App.Exception(repo.Path, App.Text("CreateBranch.Idle"));
             }
             e.Handled = true;
         }

src/Views/Widgets/DiffViewer.xaml.cs

@@ -604,7 +604,7 @@ namespace SourceGit.Views.Widgets {
 
             var merger = Models.MergeTool.Supported.Find(x => x.Type == mergeType);
             if (merger == null || merger.Type == 0 || !System.IO.File.Exists(mergeExe)) {
-                Models.Exception.Raise("Invalid merge tool in preference setting!");
+                App.Exception(repo, "Invalid merge tool in preference setting!");
                 return;
             }
 

src/Views/Widgets/Exceptions.xaml.cs

@@ -10,9 +10,31 @@ namespace SourceGit.Views.Widgets {
     public partial class Exceptions : UserControl {
         public ObservableCollection<string> Messages { get; set; }
 
+        /// <summary>
+        ///     用于判断异常是否属于自己的上下文属性
+        /// </summary>
+        public static readonly DependencyProperty ContextProperty = DependencyProperty.Register(
+            "Context",
+            typeof(string),
+            typeof(Exceptions),
+            new PropertyMetadata(null));
+
+        /// <summary>
+        ///     上下文
+        /// </summary>
+        public string Context {
+            get { return (string)GetValue(ContextProperty); }
+            set { SetValue(ContextProperty, value); }
+        }
+
         public Exceptions() {
+            App.ExceptionRaised += (ctx, detail) => {
+                Dispatcher.Invoke(() => {
+                    if (ctx == Context) Messages.Add(detail);
+                });
+            };
+
             Messages = new ObservableCollection<string>();
-            Models.Exception.Handler = e => Dispatcher.Invoke(() => Messages.Add(e));
             InitializeComponent();
         }
 

src/Views/Widgets/Histories.xaml.cs

@@ -303,7 +303,7 @@ namespace SourceGit.Views.Widgets {
                         }
                     }
 
-                    Models.Exception.Raise("Can NOT found parent of HEAD!");
+                    App.Exception(repo.Path, "Can NOT found parent of HEAD!");
                     e.Handled = true;
                 };
                 menu.Items.Add(squash);

src/Views/Widgets/Welcome.xaml

@@ -1,4 +1,5 @@
 <UserControl x:Class="SourceGit.Views.Widgets.Welcome"
+             x:Name="me"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
@@ -156,6 +157,13 @@
                 FontWeight="Bold"
                 Text="{DynamicResource Text.Welcome.DragDropTip}" 
                 Foreground="{DynamicResource Brush.FG2}"/>
-        </StackPanel>        
+        </StackPanel>
+
+        <!-- Alerts -->
+        <local:Exceptions
+            Grid.Row="1" 
+            HorizontalAlignment="Right" VerticalAlignment="Top"
+            Width="330" Height="Auto"
+            Context="{Binding ElementName=me, Path=ExceptionContext}"/>
     </Grid>
 </UserControl>

src/Views/Widgets/Welcome.xaml.cs

@@ -14,8 +14,14 @@ namespace SourceGit.Views.Widgets {
     ///     新标签页
     /// </summary>
     public partial class Welcome : UserControl {
+        public string ExceptionContext {
+            get;
+            set;
+        }
 
         public Welcome() {
+            ExceptionContext = Guid.NewGuid().ToString();
+
             InitializeComponent();
             UpdateVisibles();
 
@@ -34,7 +40,7 @@ namespace SourceGit.Views.Widgets {
             if (MakeSureReady()) {
                 var bash = Path.Combine(Models.Preference.Instance.Git.Path, "..", "bash.exe");
                 if (!File.Exists(bash)) {
-                    Models.Exception.Raise(App.Text("MissingBash"));
+                    App.Exception(ExceptionContext, App.Text("MissingBash"));
                     return;
                 }
 
@@ -175,7 +181,7 @@ namespace SourceGit.Views.Widgets {
 
             var bash = Path.Combine(Models.Preference.Instance.Git.Path, "..", "bash.exe");
             if (!File.Exists(bash)) {
-                Models.Exception.Raise(App.Text("MissingBash"));
+                App.Exception(ExceptionContext, App.Text("MissingBash"));
                 return;
             }
 
@@ -245,7 +251,7 @@ namespace SourceGit.Views.Widgets {
 
         private bool MakeSureReady() {
             if (!Models.Preference.Instance.IsReady) {
-                Models.Exception.Raise(App.Text("NotConfigured"));
+                App.Exception(ExceptionContext, App.Text("NotConfigured"));
                 return false;
             }
             return true;
@@ -255,7 +261,7 @@ namespace SourceGit.Views.Widgets {
             if (!MakeSureReady()) return;
 
             if (!Directory.Exists(path)) {
-                Models.Exception.Raise(App.Text("PathNotFound", path));
+                App.Exception(ExceptionContext, App.Text("PathNotFound", path));
                 return;
             }
 

src/Views/Widgets/WorkingCopy.xaml.cs

@@ -220,7 +220,7 @@ namespace SourceGit.Views.Widgets {
 
             var merger = Models.MergeTool.Supported.Find(x => x.Type == mergeType);
             if (merger == null || merger.Type == 0 || !File.Exists(mergeExe)) {
-                Models.Exception.Raise("Invalid merge tool in preference setting!");
+                App.Exception(repo.Path, "Invalid merge tool in preference setting!");
                 return;
             }
 
@@ -289,7 +289,7 @@ namespace SourceGit.Views.Widgets {
         private void StartAmend(object sender, RoutedEventArgs e) {
             var commits = new Commands.Commits(repo.Path, "-n 1", false).Result();
             if (commits.Count == 0) {
-                Models.Exception.Raise("No commits to amend!");
+                App.Exception(repo.Path, "No commits to amend!");
                 chkAmend.IsChecked = false;
                 return;
             }
@@ -316,12 +316,12 @@ namespace SourceGit.Views.Widgets {
             var changes = await Task.Run(() => new Commands.LocalChanges(repo.Path).Result());
             var conflict = changes.Find(x => x.IsConflit);
             if (conflict != null) {
-                Models.Exception.Raise("You have unsolved conflicts in your working copy!");
+                App.Exception(repo.Path, "You have unsolved conflicts in your working copy!");
                 return;
             }
 
             if (stagedContainer.Changes.Count == 0) {
-                Models.Exception.Raise("No files added to commit!");
+                App.Exception(repo.Path, "No files added to commit!");
                 return;
             }
 
@@ -351,12 +351,12 @@ namespace SourceGit.Views.Widgets {
             var changes = await Task.Run(() => new Commands.LocalChanges(repo.Path).Result());
             var conflict = changes.Find(x => x.IsConflit);
             if (conflict != null) {
-                Models.Exception.Raise("You have unsolved conflicts in your working copy!");
+                App.Exception(repo.Path, "You have unsolved conflicts in your working copy!");
                 return;
             }
 
             if (stagedContainer.Changes.Count == 0) {
-                Models.Exception.Raise("No files added to commit!");
+                App.Exception(repo.Path, "No files added to commit!");
                 return;
             }