/// <summary>
/// Raises the ValueChanging event when Value property is changing.
/// </summary>
/// <param name="e">Event args.</param>
protected virtual void OnValueChanging(RoutedPropertyChangingEventArgs <T> e)
{
if (ValueChanging != null)
{
ValueChanging(this, e);
}
}
/// <summary>
/// Raises the DropDownClosing event.
/// </summary>
/// <param name="e">
/// Provides any observers the opportunity to cancel the operation
/// and halt closing the drop down.
/// </param>
protected virtual void OnDropDownClosing(RoutedPropertyChangingEventArgs <bool> e)
{
RoutedPropertyChangingEventHandler <bool> handler = DropDownClosing;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// ValueProperty property changed handler.
/// </summary>
/// <param name="d">UpDownBase whose Value changed.</param>
/// <param name="e">Event arguments.</param>
private static void OnValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
UpDownBase <T> source = (UpDownBase <T>)d;
// Ignore the change if requested
if (source._ignoreValueChange)
{
return;
}
T oldValue = (T)e.OldValue;
T newValue = (T)e.NewValue;
// simulate pre and post events
// The Value has already been changed when this function is called.
// So if user's chaning event handler check Value, it will be the changed value.
// This is confusing, because we are simulating pre event on the platform that doesn't natively support it.
RoutedPropertyChangingEventArgs <T> changingArgs = new RoutedPropertyChangingEventArgs <T>(e.Property, oldValue, newValue, true);
source.OnValueChanging(changingArgs);
// hack: work around the class hierarchy for value coercion in NumericUpDown
if (changingArgs.InCoercion)
{
}
else if (!changingArgs.Cancel)
{
newValue = (T)changingArgs.NewValue;
////if (!oldValue.Equals(newValue))
////{
////UpDownBaseAutomationPeer peer = nud.GetAutomationPeer() as UpDownBaseAutomationPeer;
////if (peer != null)
////{
//// peer.RaiseValuePropertyChangedEvent(oldValue, newValue);
////}
RoutedPropertyChangedEventArgs <T> changedArgs = new RoutedPropertyChangedEventArgs <T>(oldValue, newValue);
source.OnValueChanged(changedArgs);
////}
}
else
{
// revert back to old value if an event handler canceled the changing event.
source._ignoreValueChange = true;
source.Value = oldValue;
source._ignoreValueChange = false;
}
}
/// <summary>
/// ValueProperty property changed handler.
/// </summary>
/// <param name="d">UpDownBase whose Value changed.</param>
/// <param name="e">Event arguments.</param>
private static void OnValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TimePickerPopup source = (TimePickerPopup)d;
// Ignore the change if requested
if (source._ignoreValueChange)
{
// we do want to raise the event, but won't react to anything.
source.OnValueChanged(new RoutedPropertyChangedEventArgs <DateTime?>(e.OldValue as DateTime?, e.NewValue as DateTime?));
return;
}
DateTime?oldValue = (DateTime?)e.OldValue;
DateTime?newValue = (DateTime?)e.NewValue;
// simulate pre and post events
// The Value has already been changed when this function is called.
// So if user's chaning event handler check Value, it will be the changed value.
// This is confusing, because we are simulating pre event on the platform that doesn't natively support it.
RoutedPropertyChangingEventArgs <DateTime?> changingArgs = new RoutedPropertyChangingEventArgs <DateTime?>(e.Property, oldValue, newValue, true);
source.OnValueChanging(changingArgs);
// workaround the class hierarchy for value coercion
if (changingArgs.InCoercion)
{
}
else if (!changingArgs.Cancel)
{
newValue = changingArgs.NewValue;
RoutedPropertyChangedEventArgs <DateTime?> changedArgs = new RoutedPropertyChangedEventArgs <DateTime?>(oldValue, newValue);
source.OnValueChanged(changedArgs);
TimePickerPopupAutomationPeer peer = FrameworkElementAutomationPeer.FromElement(source) as TimePickerPopupAutomationPeer;
if (peer != null)
{
peer.RaiseValueAutomationEvent(oldValue, newValue);
}
}
else
{
// revert back to old value if an event handler canceled the changing event.
source._ignoreValueChange = true;
source.Value = oldValue;
source._ignoreValueChange = false;
}
}
/// <summary>
/// Raises the ValueChanging event when Value property is changing.
/// </summary>
/// <param name="e">Event args.</param>
/// <remarks>Cancels the event when the value is not part of the domain.</remarks>
protected override void OnValueChanging(RoutedPropertyChangingEventArgs <object> e)
{
// value needs to be contained in the items collection.
if (e != null && ((e.NewValue == null && GetActualItems().Count() > 0) ||
(e.NewValue != null && !GetActualItems().Contains(e.NewValue))))
{
e.Cancel = true;
if (_valueDuringInitialization == null && e.NewValue != null)
{
_valueDuringInitialization = e.NewValue;
}
}
else
{
base.OnValueChanging(e);
}
}
protected virtual void OnValueChanging(RoutedPropertyChangingEventArgs <DateTime?> e)
{
// change is from value itself.
bool success = _timeCoercionHelper.CoerceValue(e.OldValue, e.NewValue);
if (success)
{
e.InCoercion = false;
e.NewValue = Value;
RoutedPropertyChangingEventHandler <DateTime?> handler = ValueChanging;
if (handler != null)
{
handler(this, e);
}
}
else
{
e.InCoercion = true;
}
}
/// <summary>
/// Override UpDownBase<T>.OnValueChanging to do validation and coercion.
/// </summary>
/// <param name="e">Event args.</param>
protected override void OnValueChanging(RoutedPropertyChangingEventArgs <double> e)
{
// Note: this section is a workaround, containing my
// logic to hold all calls to the property changed
// methods until after all coercion has completed
// ----------
if (_levelsFromRootCall == 0)
{
// validation
EnsureValidDoubleValue(this, e.Property, e.OldValue, e.NewValue);
_initialVal = e.OldValue;
_requestedVal = e.NewValue;
e.InCoercion = true;
}
_levelsFromRootCall++;
// ----------
CoerceValue();
// Note: this section completes my workaround to call
// the property changed logic if all coercion has completed
// ----------
_levelsFromRootCall--;
if (_levelsFromRootCall == 0)
{
e.InCoercion = false;
double value = Value;
if (_initialVal != value)
{
e.NewValue = Value;
base.OnValueChanging(e);
}
}
// ----------
}
/// <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);
}
}
