private void Prepare(ListBox target)
{
// The ListBox needs to be part of a rooted visual tree.
var root = new TestRoot();
root.Child = target;
// Apply the template to the ListBox itself.
target.ApplyTemplate();
// Then to its inner ScrollViewer.
var scrollViewer = (ScrollViewer)target.GetVisualChildren().Single();
scrollViewer.ApplyTemplate();
// Then make the ScrollViewer create its child.
((ContentPresenter)scrollViewer.Presenter).UpdateChild();
// Now the ItemsPresenter should be reigstered, so apply its template.
target.Presenter.ApplyTemplate();
// Because ListBox items are virtualized we need to do a layout to make them appear.
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
// Now set and apply the item templates.
foreach (ListBoxItem item in target.Presenter.Panel.Children)
{
item.Template = ListBoxItemTemplate();
item.ApplyTemplate();
item.Presenter.ApplyTemplate();
((ContentPresenter)item.Presenter).UpdateChild();
}
// The items were created before the template was applied, so now we need to go back
// and re-arrange everything.
foreach (IControl i in target.GetSelfAndVisualDescendants())
{
i.InvalidateMeasure();
}
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
}
/// <summary>
/// Shows the list of suggestions. If the current word is not misspelled
/// this method does nothing.
/// </summary>
public void ShowSuggestions()
{
if (AreSuggestionsVisible || !IsCurrentWordMisspelled)
{
return;
}
// If this method was called by external code,
// the list of suggestions will not be populated yet.
if (suggestionList.ItemsSource == null)
{
AttemptToShowSuggestions();
return;
}
AdornerLayer layer = AdornerLayer.GetAdornerLayer(this);
if (layer == null)
{
return;
}
// Position the adorner beneath the misspelled word.
int idx = FindBeginningOfCurrentWord();
Rect rect = GetRectFromCharacterIndex(idx);
adorner.SetOffsets(rect.Left, rect.Bottom);
// Add the adorner into the adorner layer.
layer.Add(adorner);
// Since the ListBox might have a new set of items but has not
// rendered yet, we force it to calculate its metrics so that
// the height animation has a sensible target value.
suggestionList.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
suggestionList.Arrange(new Rect(new Point(), suggestionList.DesiredSize));
// Animate the ListBox's height to the natural value.
var anim = new DoubleAnimation
{
From = 0.0,
To = suggestionList.ActualHeight,
Duration = new Duration(TimeSpan.FromMilliseconds(200)),
FillBehavior = FillBehavior.Stop
};
suggestionList.BeginAnimation(HeightProperty, anim);
areSuggestionsVisible = true;
}
private void Prepare(ListBox target)
{
// The ListBox needs to be part of a rooted visual tree.
var root = new TestRoot();
root.Child = target;
// Apply the template to the ListBox itself.
target.ApplyTemplate();
// Then to its inner ScrollViewer.
var scrollViewer = (ScrollViewer)target.GetVisualChildren().Single();
scrollViewer.ApplyTemplate();
// Then make the ScrollViewer create its child.
((ContentPresenter)scrollViewer.Presenter).UpdateChild();
// Now the ItemsPresenter should be reigstered, so apply its template.
target.Presenter.ApplyTemplate();
// Because ListBox items are virtualized we need to do a layout to make them appear.
target.Measure(new Size(100, 100));
target.Arrange(new Rect(0, 0, 100, 100));
// Now set and apply the item templates.
foreach (ListBoxItem item in target.Presenter.Panel.Children)
{
item.Template = ListBoxItemTemplate();
item.ApplyTemplate();
item.Presenter.ApplyTemplate();
((ContentPresenter)item.Presenter).UpdateChild();
}
// The items were created before the template was applied, so now we need to go back
// and re-arrange everything.
foreach (IControl i in target.GetSelfAndVisualDescendents())
{
i.InvalidateMeasure();
}
target.Arrange(new Rect(0, 0, 100, 100));
}
