/// <summary>
/// PopupButtonModeProperty property changed handler.
/// </summary>
/// <param name="d">Picker that changed its PopupButtonMode.</param>
/// <param name="e">Event arguments.</param>
private static void OnPopupButtonModePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Picker source = (Picker)d;
ClickMode newValue = (ClickMode)e.NewValue;
if (newValue != ClickMode.Hover &&
newValue != ClickMode.Press &&
newValue != ClickMode.Release)
{
// revert to old value
source.SetValue(PopupButtonModeProperty, e.OldValue);
// todo: move to resource
string message = string.Format(
CultureInfo.InvariantCulture,
"Invalid value: {0}",
newValue);
throw new ArgumentOutOfRangeException("e", message);
}
if (source.DropDownToggleButton != null)
{
source.DropDownToggleButton.ClickMode = newValue;
}
}
private static void OnMaxDropDownHeightPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Picker source = (Picker)d;
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
double newValue = (double)e.NewValue;
// Revert to the old value if invalid (negative)
if (newValue < 0)
{
source._ignorePropertyChange = true;
source.SetValue(e.Property, e.OldValue);
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, Properties.Resources.Picker_OnMaxDropDownHeightPropertyChanged_InvalidValue, e.NewValue), "value");
}
source.OnMaxDropDownHeightChanged(newValue);
}
/// <summary>
/// IsDropDownOpenProperty property changed handler.
/// </summary>
/// <param name="d">Picker that changed its IsDropDownOpen.</param>
/// <param name="e">Event arguments.</param>
private static void OnIsDropDownOpenPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Picker source = (Picker)d;
// Ignore the change if requested
if (source._ignorePropertyChange)
{
source._ignorePropertyChange = false;
return;
}
bool oldValue = (bool)e.OldValue;
bool newValue = (bool)e.NewValue;
bool delayedClosingVisual = source._popupClosedVisualState;
RoutedPropertyChangingEventArgs <bool> args = new RoutedPropertyChangingEventArgs <bool>(e.Property, oldValue, newValue, true);
PickerAutomationPeer peer = FrameworkElementAutomationPeer.FromElement(source) as PickerAutomationPeer;
if (peer != null)
{
peer.RaiseExpandCollapseAutomationEvent(oldValue, newValue);
}
if (newValue)
{
// Opening
source.OnDropDownOpening(args);
// Opened
if (!args.Cancel)
{
source.OpenDropDown(oldValue, newValue);
}
}
else
{
// Closing
source.OnDropDownClosing(args);
// Immediately close the drop down window:
// When a popup closed visual state is present, the code path is
// slightly different and the actual call to CloseDropDown will
// be called only after the visual state's transition is done
if (!args.Cancel && !delayedClosingVisual)
{
source.CloseDropDown(oldValue, newValue);
}
}
// If canceled, revert the value change
if (args.Cancel)
{
// source._ignorePropertyChange = true;
source.SetValue(e.Property, oldValue);
}
// Closing call when visual states are in use
if (delayedClosingVisual)
{
source.UpdateVisualState(true);
}
}
