/// <summary>
/// Indicates whether or not the watermark should be shown on the specified control
/// </summary>
/// <param name="c"><see cref="Control" /> to test</param>
/// <returns>true if the watermark should be shown; false otherwise</returns>
private static bool ShouldShowWatermark(Control c)
{
ComboBox comboBox = c as ComboBox;
TextBox textBox = c as TextBox;
ItemsControl itemsControl = c as ItemsControl;
AutoCompleteTextBox autoCompleteTextBox = c as AutoCompleteTextBox;
if (comboBox != null)
{
return(string.IsNullOrEmpty(comboBox.Text));
}
if (textBox != null)
{
return(string.IsNullOrEmpty(textBox.Text));
}
if (itemsControl != null)
{
return(itemsControl.Items.Count == 0);
}
if (autoCompleteTextBox != null)
{
if (autoCompleteTextBox.IsDelayed)
{
return(false);
}
return(string.IsNullOrEmpty(autoCompleteTextBox.Text));
}
return(false);
}
/// <summary>
/// Called when <see cref="AutoCompleteTextBox.Text" /> dependency property changes.
/// </summary>
/// <param name="dependencyObject">The dependency object.</param>
/// <param name="e">The <see cref="DependencyPropertyChangedEventArgs" /> instance containing the event data.</param>
private static void OnTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
AutoCompleteTextBox autoCompleteTextBox = dependencyObject as AutoCompleteTextBox;
if (autoCompleteTextBox != null)
{
autoCompleteTextBox.Text = (string)e.NewValue;
}
}
/// <summary>
/// Called when <see cref="AutoCompleteTextBox.AutoCompleteSource" /> dependency property changes.
/// </summary>
/// <param name="dependencyObject">The dependency object.</param>
/// <param name="e">The <see cref="DependencyPropertyChangedEventArgs" /> instance containing the event data.</param>
private static void OnAutoCompleteSourceChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
AutoCompleteTextBox autoCompleteTextBox = dependencyObject as AutoCompleteTextBox;
if (autoCompleteTextBox != null)
{
autoCompleteTextBox.AutoCompleteSource = (IEnumerable <string>)e.NewValue;
}
}
/// <summary>
/// Handles changes to the Watermark property.
/// </summary>
/// <param name="d"><see cref="DependencyObject" /> that fired the event</param>
/// <param name="e">A <see cref="DependencyPropertyChangedEventArgs" /> that contains the event data.</param>
private static void OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Control control = (Control)d;
control.Loaded += Control_Loaded;
ComboBox comboBox = d as ComboBox;
TextBox textBox = d as TextBox;
AutoCompleteTextBox autoCompleteTextBox = d as AutoCompleteTextBox;
if (comboBox != null || textBox != null || autoCompleteTextBox != null)
{
control.GotKeyboardFocus += Control_GotKeyboardFocus;
control.LostKeyboardFocus += Control_Loaded;
if (textBox != null)
{
textBox.TextChanged += TextBox_TextChanged;
}
else if (autoCompleteTextBox != null)
{
autoCompleteTextBox.TextChanged += TextBox_TextChanged;
}
}
ItemsControl i = d as ItemsControl;
if (i != null && comboBox == null)
{
// for Items property
i.ItemContainerGenerator.ItemsChanged += ItemsChanged;
ItemsControls.Add(i.ItemContainerGenerator, i);
// for ItemsSource property
DependencyPropertyDescriptor prop = DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, i.GetType());
prop.AddValueChanged(i, ItemsSourceChanged);
}
}
