Automatically start a new search after some time has passed.

src/MainForm.cs

@@ -26,6 +26,7 @@ public partial class MainForm : Form
     private Point? mMouseDragAnchor = null ;
     private Tuple<int,int> mScrollDragAnchor ;
     private double mUserZoom = 1.0 ;
+    private DateTime mLastKeyPressTimeStamp = DateTime.Now ;
 
     public MainForm()
     {

src/MainForm.ui.cs

@@ -73,6 +73,7 @@ public partial class MainForm : Form
         this.FormClosing += new FormClosingEventHandler( this.MainForm_FormClosing ) ;
         this.Resize += new EventHandler( this.MainForm_Resize ) ;
         this.mSearchQuery.TextChanged += new EventHandler( this.SearchQuery_TextChanged ) ;
+        this.mSearchQuery.KeyPress += new KeyPressEventHandler( this.SearchQuery_KeyPress ) ;
         this.mSearchQuery.KeyDown += new KeyEventHandler( this.SearchQuery_KeyDown ) ;
         this.mSearchResults.KeyPress += new KeyPressEventHandler( this.SearchResults_KeyPress ) ;
         this.mSearchResults.SelectionChanged += new EventHandler( this.SearchResults_SelectionChanged ) ;
@@ -338,6 +339,20 @@ public partial class MainForm : Form
         updateSearchResults( mSearchQuery.Text.Trim() ) ;
     }
 
+    private void SearchQuery_KeyPress( object sender, KeyPressEventArgs e )
+    {
+        // check how much time has passed since the last keypress
+        int ch = (int) e.KeyChar ;
+        if ( ch >= 32 && ch < 127 ) {
+            int ttl = Program.appConfig.getIntVal( new string[]{"SearchQueryTTL"}, 5 ) ;
+            if ( (DateTime.Now - mLastKeyPressTimeStamp).TotalSeconds > ttl ) {
+                // it's been a while - start a new search query
+                mSearchQuery.Text = "" ;
+            }
+            mLastKeyPressTimeStamp = DateTime.Now ;
+        }
+    }
+
     private void SearchQuery_KeyDown( object sender, KeyEventArgs e )
     {
         // check if there are any ChartImage's associated with the keypress
@@ -375,8 +390,8 @@ public partial class MainForm : Form
         if ( ch == 27 )
             mSearchQuery.Text = "" ;
         else if ( ch >= 32 && ch < 127 ) {
-            mSearchQuery.AppendText( e.KeyChar.ToString() ) ;
             mSearchQuery.Focus() ;
+            SendKeys.Send( e.KeyChar.ToString() ) ;
         }
     }
 }