private void HandleMasterDetailPagePropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == "Detail")
{
this.UnbindNavigationEventHandlers();
}
}
/// <summary>
/// Handles the <see cref="E:PropertyChanging" /> event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="Xamarin.Forms.PropertyChangingEventArgs" /> instance containing the event data.</param>
private void OnPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == "CurrentPage")
{
RaiseCurrentPageChanging();
}
}
private void FlowListViewPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == FlowItemsSourceProperty.PropertyName)
{
if (FlowItemsSource is INotifyCollectionChanged flowItemSource)
{
flowItemSource.CollectionChanged -= FlowItemsSourceCollectionChanged;
}
if (IsGroupingEnabled)
{
var groupedSource = FlowItemsSource;
if (groupedSource != null)
{
foreach (var gr in groupedSource)
{
if (gr is INotifyCollectionChanged collectionChanged)
{
collectionChanged.CollectionChanged -= FlowItemsSourceCollectionChanged;
}
}
}
}
}
}
private void GraphPropertyChanging(object sender, PropertyChangingEventArgs e)
{
var scrollView = (ScrollView)sender;
if (e.PropertyName == "ScrollX")
{
foreach (ScrollView view in _trendViewScrollViews)
{
if (scrollView != view)
{
view.PropertyChanging -= GraphPropertyChanging;
if (_loadingGraphs)
{
view.ScrollToAsync(1200, 0, false);
}
else
{
view.ScrollToAsync(scrollView.ScrollX, scrollView.ScrollY, false);
}
view.PropertyChanging += GraphPropertyChanging;
}
}
_loadingGraphs = false;
}
}
void AppOnPropertyChanging(object sender, XPropertyChangingEventArgs args)
{
if (args.PropertyName == nameof(XApplication.MainPage))
{
Platform.GetRenderer(_application?.MainPage)?.Dispose();
}
}
private void TimePicker_PropertyChanged(object sender, PropertyChangingEventArgs e)
{
if (page != null)
{
Refresh(page.Date.DayOfWeek);
}
}
private void OnLabelChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName != "Text")
{
return;
}
((Label)sender).Opacity = 0;
}
private void GridView_PropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == ItemsSourceProperty.PropertyName)
{
var items = ItemsSource as INotifyCollectionChanged;
if (items != null)
items.CollectionChanged -= ItemsCollectionChanged;
}
}
private void ElementOnPropertyChanging(object sender, PropertyChangingEventArgs e)
{
if (!ShouldTransition(e.PropertyName))
{
return;
}
IsAnimating = true;
}
private void OnPropertyChanging(object sender, PropertyChangingEventArgs propertyChangingEventArgs)
{
if (propertyChangingEventArgs.PropertyName == nameof(InnerContent))
{
if (InnerContent != null)
{
Grid.Children.Remove(InnerContent);
}
}
}
// To be used with Page classes implementing IPageContainer.
// Luckily, even though IPageContainer does not include the property changing event,
// all classes implementing IPageContainer do send this event for CurrentPage.
void HandleContainerPagePropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
var pageContainer = sender as IPageContainer <Page>;
if (e.PropertyName != nameof(pageContainer.CurrentPage))
{
return;
}
HandlePageDisappearing(pageContainer.CurrentPage);
}
/// <summary>
/// Elements the property changing.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="PropertyChangingEventArgs" /> instance containing the event data.</param>
private void ElementPropertyChanging(object sender, PropertyChangingEventArgs e)
{
if (e.PropertyName == GridView.ItemsSourceProperty.PropertyName)
{
if (Element.ItemsSource is INotifyCollectionChanged)
{
(Element.ItemsSource as INotifyCollectionChanged).CollectionChanged -= DataCollectionChanged;
}
}
}
private void ElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == GridView.ItemsSourceProperty.PropertyName)
{
if (Element != null && Element.ItemsSource is INotifyCollectionChanged)
{
(Element.ItemsSource as INotifyCollectionChanged).CollectionChanged -= ItemsSource_CollectionChanged;
}
}
}
private void TagEntryViewPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == TagItemsProperty.PropertyName)
{
var tagItems = TagItems as INotifyCollectionChanged;
if (tagItems != null)
{
tagItems.CollectionChanged -= TagItemsCollectionChanged;
}
}
}
/// <summary>
/// Private event handler that is called whenever a <see cref="T:Xamarin.Forms.BindableObject.PropertyChanging"/>
/// event is fired.
/// </summary>
/// <param name="sender">Sender.</param>
/// <param name="args">Property changing event arguments</param>
void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs args)
{
if (args.PropertyName == ContentPageGloss.BackgroundGradientProperty.PropertyName)
{
Gradient bkgrndGradient = ContentPageGloss.GetBackgroundGradient(Element);
if (bkgrndGradient != null)
{
bkgrndGradient.DetachRenderer(this);
}
}
}
void OnLabelPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (!(sender is Label))
{
return;
}
if (e.PropertyName == "Text")
{
OnLabelTextChanging(sender as Label);
}
}
private void VisualElement_PropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
var visualElement = ((VisualElement)sender);
if (e.PropertyName == "WidthRequest")
{
WidthRequest = -1;
}
if (e.PropertyName == "HeightRequest")
{
HeightRequest = -1;
}
}
void OnMapStylePropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName == MapStyle.CustomSourcesProperty.PropertyName &&
(sender as MapStyle).CustomSources != null)
{
var notifiyCollection = (sender as MapStyle).CustomSources as INotifyCollectionChanged;
if (notifiyCollection != null)
{
notifiyCollection.CollectionChanged -= OnShapeSourcesCollectionChanged;
}
RemoveSources(Element.MapStyle.CustomSources.ToList());
}
}
void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (sender is VisualElement)
{
if (e.PropertyName == "Renderer")
{
RendererDisconnect();
}
else if (e.PropertyName == GestureHandlerProperty.PropertyName)
{
_element.Behaviors.Remove(this);
}
}
}
void OnMapStylePropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (e.PropertyName != MapStyle.CustomSourcesProperty.PropertyName ||
(sender as MapStyle)?.CustomSources == null)
{
return;
}
if (((MapStyle)sender).CustomSources is INotifyCollectionChanged notifiyCollection)
{
notifiyCollection.CollectionChanged -= OnShapeSourcesCollectionChanged;
}
RemoveSources(Element.MapStyle.CustomSources.ToList());
}
void Handle_PropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
try
{
if (CarruselFavoritos.ItemsCount > 1)
{
Indicador.IsVisible = true;
}
else
{
Indicador.IsVisible = false;
}
}
catch (Exception ex)
{
}
}
void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (Element == null)
{
return;
}
if (e.PropertyName == FormsMap.AnnotationsProperty.PropertyName &&
Element.Annotations != null)
{
RemoveAllAnnotations();
var notifyCollection = Element.Annotations as INotifyCollectionChanged;
if (notifyCollection != null)
{
notifyCollection.CollectionChanged -= OnAnnotationsCollectionChanged;
}
}
else if (e.PropertyName == FormsMap.MapStyleProperty.PropertyName &&
Element.MapStyle != null)
{
if (Element.MapStyle.CustomSources != null)
{
var notifiyCollection = Element.MapStyle.CustomSources as INotifyCollectionChanged;
if (notifiyCollection != null)
{
notifiyCollection.CollectionChanged -= OnShapeSourcesCollectionChanged;
}
RemoveSources(Element.MapStyle.CustomSources.ToList());
}
if (Element.MapStyle.CustomLayers != null)
{
var notifiyCollection = Element.MapStyle.CustomLayers as INotifyCollectionChanged;
if (notifiyCollection != null)
{
notifiyCollection.CollectionChanged -= OnLayersCollectionChanged;
}
RemoveLayers(Element.MapStyle.CustomLayers.ToList());
}
Element.MapStyle.PropertyChanging -= OnMapStylePropertyChanging;
Element.MapStyle.PropertyChanged -= OnMapStylePropertyChanged;
}
}
void HandleFlyoutPagePropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
var flyoutPage = sender as FlyoutPage;
Page page = null;
if (e.PropertyName == nameof(flyoutPage.Detail))
{
page = flyoutPage.Detail;
}
else if (e.PropertyName == nameof(flyoutPage.Flyout))
{
page = flyoutPage.Flyout;
}
if (page != null)
{
HandlePageDisappearing(page);
}
}
protected void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (Element == null)
{
return;
}
if (e.PropertyName == MapView.AnnotationsProperty.PropertyName)
{
if (Element.Annotations == null || Element.Annotations.Count() == 0)
{
return;
}
RemoveAllAnnotations();
if (Element.Annotations is INotifyCollectionChanged observable)
{
observable.CollectionChanged -= OnAnnotationsCollectionChanged;
}
}
}
void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
if (Element == null)
{
return;
}
if (e.PropertyName == FormsMap.AnnotationsProperty.PropertyName &&
Element.Annotations != null)
{
RemoveAllAnnotations();
var notifyCollection = Element.Annotations as INotifyCollectionChanged;
if (notifyCollection != null)
{
notifyCollection.CollectionChanged -= OnAnnotationsCollectionChanged;
}
}
else if (e.PropertyName == FormsMap.MapStyleProperty.PropertyName &&
Element.MapStyle != null)
{
Element.MapStyle.PropertyChanging -= OnMapStylePropertyChanging;
Element.MapStyle.PropertyChanged -= OnMapStylePropertyChanged;
}
}
public void pc (object sender, PropertyChangingEventArgs e) {
if (e.PropertyName == "IsToggled") {
if (c == 1) {
checkLoop = false;
c = 0;
} else {
checkLoop = true;
}
System.Diagnostics.Debug.WriteLine ("is PropertyChangedEventArgs");
//bcd = true;
}
}
void OnElementPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
}
private void DoPropertyChanging(object sender, Xamarin.Forms.PropertyChangingEventArgs e)
{
Console.WriteLine($"這個屬性 ==>{e.PropertyName} 的值，準備產生異動");
}
private void HandleMasterDetailPagePropertyChanging(object sender, PropertyChangingEventArgs e)
{
if (e.PropertyName == "Detail")
{
this.UnbindNavigationEventHandlers();
}
}
void mContentView_PropertyChanging(object sender, PropertyChangingEventArgs e)
{
if (e.PropertyName.Equals("Width"))
{
//ContentView changedView = sender as ContentView;
//if (null == changedView)
//{
// Debug.WriteLine("sender is wrong type.");
// return;
//}
////mImage.HeightRequest = 20;
////mImage.WidthRequest = 20;
//if (changedView.Width > changedView.Height)
//{
// Debug.WriteLine("Was landscape");
// lastOrientation = Orientation.LANDSCAPE;
//}
//else
//{
// Debug.WriteLine("Was portait");
// lastOrientation = Orientation.PORTRAIT;
//}
//if (lastOrientation == Orientation.PORTRAIT)
//{
// mImage.WidthRequest = 20;
// mImage.HeightRequest = 20;
//}
}
}
protected void OnElementPropertyChanged(object sender, PropertyChangingEventArgs e)
{
}
void OnItemPropertyChanging(object sender, PropertyChangingEventArgs e) => OnPropertyChanging(nameof(Spans));
