Fully implemented the tracking bar control which will now act as a specialized progress bar for tracking progressions

git-svn-id: file:///srv/devel/repo-conversion/nuwi@7 d2e56fa2-650e-0410-a79f-9358c0239efd

Source/ContainerListView/ContainerListView.Designer.cs

@@ -21,15 +21,14 @@ License along with this library
 namespace Nuclex.Windows.Forms {
 
   partial class ContainerListView {
-    /// <summary> 
-    /// Required designer variable.
-    /// </summary>
+
+    /// <summary>Required designer variable.</summary>
     private System.ComponentModel.IContainer components = null;
 
-    /// <summary> 
-    /// Clean up any resources being used.
-    /// </summary>
-    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+    /// <summary>Clean up any resources being used.</summary>
+    /// <param name="disposing">
+    ///   true if managed resources should be disposed; otherwise, false.
+    /// </param>
     protected override void Dispose(bool disposing) {
       if(disposing && (components != null)) {
         components.Dispose();

Source/ContainerListView/ContainerListView.cs

@@ -17,6 +17,7 @@ You should have received a copy of the IBM Common Public
 License along with this library
 */
 #endregion
+
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
@@ -32,7 +33,7 @@ namespace Nuclex.Windows.Forms {
   /// <remarks>
   ///   There basically were two possible design choices: Provide a specialized
   ///   ListViewSubItem that carries a Control instead of a string or manage the
-  ///   embedded controls in seperation of the ListView's items. The first option
+  ///   embedded controls seperate of the ListView's items. The first option
   ///   would require a complete rewrite of the ListViewItem class and its related
   ///   support classes, all of which are surprisingly large and complex. Thus,
   ///   the less clean but more doable latter option has been chosen.

Source/ContainerListView/ListViewEmbeddedControl.cs

@@ -17,6 +17,7 @@ You should have received a copy of the IBM Common Public
 License along with this library
 */
 #endregion
+
 using System;
 using System.Collections.Generic;
 using System.Windows.Forms;

Source/ContainerListView/ListViewEmbeddedControlCollection.cs

@@ -17,6 +17,7 @@ You should have received a copy of the IBM Common Public
 License along with this library
 */
 #endregion
+
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;

Source/EmbeddedControlCollection.cs

@@ -17,6 +17,7 @@ You should have received a copy of the IBM Common Public
 License along with this library
 */
 #endregion
+
 using System;
 using System.Collections.Generic;
 using System.Windows.Forms;
@@ -79,6 +80,12 @@ namespace Nuclex.Windows.Forms {
       OnControlRemoved(value);
     }
 
+    // These three methods don't need to be override since their current implementations
+    // in the .NET Framework 2.0 all call the Remove() method on each individual control.
+    // The ControlAdded/ControlRemoved events weren't in the original class and there
+    // are other designs you could use to guarantee that removed controls get disposed
+    // properly, so this should be rechecked when the code is compiled on another
+    // version of the .NET framework
     /*
     /// <summary>Adds an array of control objects to the collection</summary>
     /// <param name="controls">

Source/TrackingBar/TrackingBar.Designer.cs

@@ -1,15 +1,33 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2007 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
 namespace Nuclex.Windows.Forms {
 
   partial class TrackingBar {
-    /// <summary> 
-    /// Required designer variable.
-    /// </summary>
+    /// <summary>Required designer variable.</summary>
     private System.ComponentModel.IContainer components = null;
 
-    /// <summary> 
-    /// Clean up any resources being used.
-    /// </summary>
-    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+    /// <summary> Clean up any resources being used.</summary>
+    /// <param name="disposing">
+    ///   true if managed resources should be disposed; otherwise, false.
+    /// </param>
     protected override void Dispose(bool disposing) {
       if(disposing && (components != null)) {
         components.Dispose();

Source/TrackingBar/TrackingBar.cs

@@ -1,3 +1,23 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2007 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
@@ -5,6 +25,9 @@ using System.Drawing;
 using System.Data;
 using System.Text;
 using System.Windows.Forms;
+using System.Threading;
+
+using Nuclex.Support.Tracking;
 
 namespace Nuclex.Windows.Forms {
 
@@ -14,8 +37,141 @@ namespace Nuclex.Windows.Forms {
     /// <summary>Initializes a new tracking bar</summary>
     public TrackingBar() {
       InitializeComponent();
+
+      // We start off being in the idle state (and thus, being invisible)
+      this.isIdle = true;
+      base.Visible = false;
+
+      // Initialize the delegates we use to update the control's state and those
+      // we use to register ourselfes to the tracker's events
+      this.updateIdleStateDelegate = new MethodInvoker(updateIdleState);
+      this.updateProgressDelegate = new MethodInvoker(updateProgress);
+      this.asyncIdleStateChangedDelegate = new EventHandler<IdleStateEventArgs>(
+        asyncIdleStateChanged
+      );
+      this.asyncProgressUpdateDelegate = new EventHandler<ProgressUpdateEventArgs>(
+        asyncProgressUpdated
+      );
+
+      // Create the tracker and attach ourselfes to its events
+      this.tracker = new ProgressionTracker();
+      this.tracker.AsyncIdleStateChanged += this.asyncIdleStateChangedDelegate;
+      this.tracker.AsyncProgressUpdated += this.asyncProgressUpdateDelegate;
     }
 
+    /// <summary>Tracks the specified progression in the tracking bar</summary>
+    /// <param name="progression">Progression to be tracked</param>
+    public void Track(Progression progression) {
+      this.tracker.Track(progression);
+    }
+
+    /// <summary>Tracks the specified progression in the tracking bar</summary>
+    /// <param name="progression">Progression to be tracked</param>
+    /// <param name="weight">Weight of this progression in the total progress</param>
+    public void Track(Progression progression, float weight) {
+      this.tracker.Track(progression, weight);
+    }
+
+    /// <summary>Stops tracking the specified progression</summary>
+    /// <param name="progression">Progression to stop tracking</param>
+    public void Untrack(Progression progression) {
+      this.tracker.Untrack(progression);
+    }
+
+    /// <summary>
+    ///   Called when the summed progressed of the tracked progressions has changed
+    /// </summary>
+    /// <param name="sender">Progression whose progress has changed</param>
+    /// <param name="arguments">Contains the progress achieved by the progression</param>
+    private void asyncProgressUpdated(
+      object sender, ProgressUpdateEventArgs arguments
+    ) {
+
+      // Set the new progress without any synchronization
+      this.currentProgress = arguments.Progress;
+
+      // Another use of the double-checked locking idiom, here we're trying to optimize
+      // away the lock in case some "trigger-happy" progressions send way more
+      // progress updates than the poor control can process :)
+      if(!this.progressUpdatePending) {
+        lock(this) {
+          if(!this.progressUpdatePending) {
+            this.progressUpdatePending = true;
+            this.progressUpdateAsyncResult = BeginInvoke(this.updateProgressDelegate);
+          }
+        } // lock
+      }
+
+    }
+    
+    /// <summary>Called when the tracker becomes enters of leaves the idle state</summary>
+    /// <param name="sender">Tracker that has entered or left the idle state</param>
+    /// <param name="arguments">Contains the new idle state</param>
+    private void asyncIdleStateChanged(object sender, IdleStateEventArgs arguments) {
+      
+      // Do a fully synchronous update of the idle state. This update must not be
+      // lost because otherwise, the progress bar might stay on-screen when in fact,
+      // the background operation has already finished and nothing is happening anymore.
+      this.isIdle = arguments.Idle;
+      Invoke(this.updateIdleStateDelegate);
+
+    }
+
+    /// <summary>Synchronously updates the value visualized in the progress bar</summary>
+    private void updateProgress() {
+      lock(this) {
+
+        // Reset the update flag so incoming updates will cause the control to
+        // update itself another time.
+        this.progressUpdatePending = false;
+        EndInvoke(this.progressUpdateAsyncResult);
+
+        // Transform the progress into an integer in the range of the progress bar's
+        // min and max values (these should normally be set to 0 and 100).
+        int min = base.Minimum;
+        int max = base.Maximum;
+        int progress = (int)(this.currentProgress * (max - min)) + min;
+
+        // Update the control
+        base.Value = progress;
+
+        // Assigning the value sends PBM_SETPOS to the control which,
+        // according to MSDN, already causes a redraw!
+        //base.Invalidate();
+
+      } // lock
+    }
+
+    /// <summary>
+    ///   Updates the idle state of the progress bar
+    ///   (controls whether the progress bar is shown or invisible)
+    /// </summary>
+    private void updateIdleState() {
+
+      base.Visible = !this.isIdle;
+
+    }
+
+    /// <summary>Whether an update of the control state is pending</summary>
+    private volatile bool progressUpdatePending;
+    /// <summary>Async result for the invoked control state update method</summary>
+    private volatile IAsyncResult progressUpdateAsyncResult;
+    /// <summary>Whether the progress bar is in the idle state</summary>
+    private volatile bool isIdle;
+    /// <summary>Most recently reported progress of the tracker</summary>
+    private volatile float currentProgress;
+
+    /// <summary>Tracker used to sum and update the total progress</summary>
+    private ProgressionTracker tracker;
+    /// <summary>Delegate for the progress update method</summary>
+    private MethodInvoker updateProgressDelegate;
+    /// <summary>Delegate for the idle state update method</summary>
+    private MethodInvoker updateIdleStateDelegate;
+    /// <summary>Delegate for the OnAsyncProgressionEnded method</summary>
+    private EventHandler<IdleStateEventArgs> asyncIdleStateChangedDelegate;
+    /// <summary>Delegate for the OnAsyncProgressionProgressUpdated method</summary>
+    private EventHandler<ProgressUpdateEventArgs> asyncProgressUpdateDelegate;
+
   }
 
 } // namespace Nuclex.Windows.Forms