DependencyGraphViewer: Feature add same window navigation for NodeForm

src/coreclr/tools/aot/DependencyGraphViewer/NodeForm.cs

@@ -10,17 +10,58 @@ namespace DependencyLogViewer
     public partial class NodeForm : Form
     {
         private readonly Graph _graph;
-        private readonly Node _node;
+        private Node _node;
 
         public NodeForm(Graph g, Node n)
         {
             _graph = g;
-            _node = n;
-
             InitializeComponent();
+            SetNode(n);
+            btnBack.Visible = btnForward.Visible = chkSameWindowNav.Checked;
+            var fixControls = new Control[] {btnBack, btnForward, chkSameWindowNav, exploreDependent, dependentsListBox, exploreDependee, dependeesListBox, this, this.splitContainer1 };
+            foreach (var cntrl in fixControls)
+            {
+                cntrl.PreviewKeyDown += Cntrl_PreviewKeyDown;
+                cntrl.KeyDown += Cntrl_KeyDown;
+            }
+        }
+
+
+        private void Cntrl_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e) {
+            if (!chkSameWindowNav.Checked)
+                return;
+            if (e.KeyCode == Keys.Left || e.KeyCode == Keys.Right)
+                e.IsInputKey = true;
+        }
+
+        private void Cntrl_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (!chkSameWindowNav.Checked)
+                return;
+            if (e.KeyCode == Keys.Left)
+            {
+                if (btnBack.Enabled)
+                    btnBack.PerformClick();
+            }
+            else if (e.KeyCode == Keys.Right)
+            {
+                if (btnForward.Enabled)
+                    btnForward.PerformClick();
+            }
+            else
+                return;
+            e.SuppressKeyPress = true;
+            e.Handled = true;
+        }
+
+        public void SetNode(Node n)
+        {
+
+            _node = n;
 
             this.Text = $"Graph Pid: {_graph.PID}, ID: {_graph.ID}, Node: {_node.ToString}";
-            this.nodeTitle.Text = $"Current Node: {_node}";
+            var nodeStr = _node.ToString().Replace(", ", "\n");
+            this.nodeTitle.Text = $"Current Node: {nodeStr}";
 
             lock (GraphCollection.Singleton)
             {
@@ -39,6 +80,9 @@ public NodeForm(Graph g, Node n)
                 this.dependentsListBox.DataSource = sourceNodes;
                 this.dependeesListBox.DataSource = targetNodes;
             }
+            if (CurSpotInHistory == -1 && chkSameWindowNav.Checked)//if we are in history we dont modify history
+                AddSelfToHistory();
+            SetNavButtonStates();
         }
 
         private static void ExploreSelectedItem(Graph graph, ListBox listbox)
@@ -54,14 +98,71 @@ private static void ExploreSelectedItem(Graph graph, ListBox listbox)
 
         private void exploreDependee_Click(object sender, EventArgs e)
         {
-            ExploreSelectedItem(_graph, dependeesListBox);
+            if (chkSameWindowNav.Checked != true)
+            {
+                ExploreSelectedItem(_graph, dependeesListBox);
+                return;
+            }
+            ClearHistoryIfIn();
+            var selected = (BoxDisplay)dependeesListBox.SelectedItem;
+            SetNode(selected.node);
         }
 
         private void exploreDependent_Click(object sender, EventArgs e)
         {
-            ExploreSelectedItem(_graph, dependentsListBox);
+            if (chkSameWindowNav.Checked != true)
+            {
+                ExploreSelectedItem(_graph, dependentsListBox);
+                return;
+            }
+            ClearHistoryIfIn();
+            var selected = (BoxDisplay)dependentsListBox.SelectedItem;
+            SetNode(selected.node);
+        }
+        private void AddSelfToHistory()
+        {
+            History.Add(_node);
+        }
+        private void ClearHistoryIfIn()
+        {
+
+            if (CurSpotInHistory != -1)
+            {
+                var removeAfter = CurSpotInHistory + 1;
+                if (removeAfter != History.Count)
+                    History.RemoveRange(removeAfter, History.Count - removeAfter);
+                CurSpotInHistory = -1;
+            }
         }
+        public int CurSpotInHistory = -1;
+        private List<Node> History = new();
 
+        private void btnBack_Click(object sender, EventArgs e)
+        {
+            if (CurSpotInHistory == -1)
+                CurSpotInHistory = History.Count - 2;
+            else if (CurSpotInHistory == 0) // should not get here
+                return;
+            else
+                CurSpotInHistory--;
+            SetNode(History[CurSpotInHistory]);
+        }
+        private void btnForward_Click(object sender, EventArgs e)
+        {
+            if (CurSpotInHistory == -1)// should not get here
+                return;
+            else if (CurSpotInHistory == History.Count - 1) // should not get here
+                return;
+            else
+                CurSpotInHistory++;
+            SetNode(History[CurSpotInHistory]);
+        }
+        private void SetNavButtonStates()
+        {
+            btnBack.Enabled = CurSpotInHistory != 0 && History.Count > 1;
+            btnForward.Enabled = CurSpotInHistory != -1 && CurSpotInHistory != History.Count - 1;
+        }
+        private void ChkSameWindowNav_CheckedChanged(object sender, System.EventArgs e) => btnBack.Visible = btnForward.Visible = chkSameWindowNav.Checked;
         private void infoButton_LinkClicked(object sender, EventArgs e)
         {
             string dMessage = "Dependent nodes depend on the current node. The current node depends on the dependees.";