/// <summary>
/// Walk the visual tree to find the ItemsControl and
/// hook into some of its events. This is done to make
/// sure that editing is cancelled whenever
///
/// 1> The parent control is scrolling its content
/// 1.1> The MouseWheel is used
/// 2> A user clicks outside the adorner control
/// 3> The parent control changes its size
///
/// </summary>
private void HookItemsControlEvents()
{
if (_PART_MeasureTextBlock == null)
{
return;
}
_TextBox = new TextBox();
_Adorner = new EditBoxAdorner(_PART_MeasureTextBlock, _TextBox, this);
AdornerLayer layer = AdornerLayer.GetAdornerLayer(_PART_MeasureTextBlock);
if (layer == null) // This layer does not always seem to be available?
{
return;
}
layer.Add(_Adorner);
// try to get the text box focused when layout finishes.
_TextBox.LayoutUpdated += new EventHandler(this.OnTextBoxLayoutUpdated);
CaptureMouse();
Mouse.AddPreviewMouseDownOutsideCapturedElementHandler(this, OnMouseDownOutsideElement);
_TextBox.PreviewTextInput += OnPreviewTextInput;
_TextBox.KeyDown += new KeyEventHandler(this.OnTextBoxKeyDown);
_TextBox.LostKeyboardFocus += new KeyboardFocusChangedEventHandler(this.OnTextBoxLostKeyboardFocus);
_TextBox.LostFocus += new RoutedEventHandler(this.OnLostFocus);
_ParentItemsControl = this.GetDpObjectFromVisualTree(this, typeof(ItemsControl)) as ItemsControl;
Debug.Assert(_ParentItemsControl != null, "DEBUG ISSUE: No FolderTreeView found.");
if (_ParentItemsControl != null)
{
// Handle events on parent control and determine whether to switch to Normal mode or stay in editing mode
_ParentItemsControl.AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(this.OnScrollViewerChanged));
_ParentItemsControl.AddHandler(ScrollViewer.MouseWheelEvent, new RoutedEventHandler((s, e) => this.OnSwitchToNormalMode()), true);
_ParentItemsControl.MouseDown += new MouseButtonEventHandler((s, e) => this.OnSwitchToNormalMode());
_ParentItemsControl.SizeChanged += new SizeChangedEventHandler((s, e) => this.OnSwitchToNormalMode());
// Restrict text box to visible area of scrollviewer
this.ParentScrollViewer = this.GetDpObjectFromVisualTree(_ParentItemsControl, typeof(ScrollViewer)) as ScrollViewer;
if (this.ParentScrollViewer == null)
{
this.ParentScrollViewer = FindVisualChild <ScrollViewer>(_ParentItemsControl);
}
Debug.Assert(this.ParentScrollViewer != null, "DEBUG ISSUE: No ScrollViewer found.");
if (this.ParentScrollViewer != null)
{
_TextBox.MaxWidth = this.ParentScrollViewer.ViewportWidth;
}
}
}
/// <summary>
/// Walk the visual tree to find the ItemsControl and
/// hook into some of its events. This is done to make
/// sure that editing is cancelled whenever
///
/// 1> The parent control is scrolling its content
/// 1.1> The MouseWheel is used
/// 2> A user clicks outside the adorner control
/// 3> The parent control changes its size
///
/// </summary>
private void HookItemsControlEvents()
{
if (this.mPART_MeasureTextBlock == null)
{
return;
}
this.mTextBox = new TextBox();
this.mAdorner = new EditBoxAdorner(this.mPART_MeasureTextBlock, this.mTextBox, this);
AdornerLayer layer = AdornerLayer.GetAdornerLayer(this.mPART_MeasureTextBlock);
layer.Add(this.mAdorner);
this.mTextBox.PreviewTextInput += OnPreviewTextInput;
this.mTextBox.KeyDown += new KeyEventHandler(this.OnTextBoxKeyDown);
this.mTextBox.LostKeyboardFocus += new KeyboardFocusChangedEventHandler(this.OnTextBoxLostKeyboardFocus);
this.mTextBox.LostFocus += new RoutedEventHandler(this.OnLostFocus);
this.mParentItemsControl = this.GetDpObjectFromVisualTree(this, typeof(ItemsControl)) as ItemsControl;
Debug.Assert(this.mParentItemsControl != null, "DEBUG ISSUE: No FolderTreeView found.");
if (this.mParentItemsControl != null)
{
// Handle events on parent control and determine whether to switch to Normal mode or stay in editing mode
this.mParentItemsControl.AddHandler(ScrollViewer.ScrollChangedEvent, new RoutedEventHandler(this.OnScrollViewerChanged));
this.mParentItemsControl.AddHandler(ScrollViewer.MouseWheelEvent, new RoutedEventHandler((s, e) => this.OnSwitchToNormalMode()), true);
this.mParentItemsControl.MouseDown += new MouseButtonEventHandler((s, e) => this.OnSwitchToNormalMode());
this.mParentItemsControl.SizeChanged += new SizeChangedEventHandler((s, e) => this.OnSwitchToNormalMode());
// Restrict text box to visible area of scrollviewer
this.ParentScrollViewer = this.GetDpObjectFromVisualTree(this.mParentItemsControl, typeof(ScrollViewer)) as ScrollViewer;
if (this.ParentScrollViewer == null)
{
this.ParentScrollViewer = FindVisualChild <ScrollViewer>(this.mParentItemsControl);
}
Debug.Assert(this.ParentScrollViewer != null, "DEBUG ISSUE: No ScrollViewer found.");
if (this.ParentScrollViewer != null)
{
this.mTextBox.MaxWidth = this.ParentScrollViewer.ViewportWidth;
}
}
}
