ImageExBase Class

Definition

Namespace:

Microsoft.Toolkit.Uwp.UI.Controls

Assembly:

Microsoft.Toolkit.Uwp.UI.Controls.Core.dll

Package:

Microsoft.Toolkit.Uwp.UI.Controls.Core v7.1.2

Base Code for ImageEx

[Windows.UI.Xaml.TemplatePart(Name="Image", Type=typeof(System.Object))]
[Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Loading")]
[Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Loaded")]
[Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Unloaded")]
[Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Failed")]
public abstract class ImageExBase : Windows.UI.Xaml.Controls.Control, Microsoft.Toolkit.Uwp.UI.IAlphaMaskProvider

[<Windows.UI.Xaml.TemplatePart(Name="Image", Type=typeof(System.Object))>]
[<Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Loading")>]
[<Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Loaded")>]
[<Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Unloaded")>]
[<Windows.UI.Xaml.TemplateVisualState(GroupName="CommonStates", Name="Failed")>]
type ImageExBase = class
    inherit Control
    interface IAlphaMaskProvider

Public MustInherit Class ImageExBase
Inherits Control
Implements IAlphaMaskProvider

Inheritance

Windows.UI.Xaml.Controls.Control

ImageExBase

Derived

Microsoft.Toolkit.Uwp.UI.Controls.ImageEx

Attributes

Windows.UI.Xaml.TemplateVisualStateAttribute

Implements

IAlphaMaskProvider

Constructors

ImageExBase()

Initializes a new instance of the ImageExBase class.

Fields

CommonGroup	VisualStates name in template
DecodePixelHeightProperty	Identifies the DecodePixelHeight dependency property.
DecodePixelTypeProperty	Identifies the DecodePixelType dependency property.
DecodePixelWidthProperty	Identifies the DecodePixelWidth dependency property.
EnableLazyLoadingProperty	Identifies the EnableLazyLoading dependency property.
FailedState	Failed name in template
IsCacheEnabledProperty	Identifies the IsCacheEnabled dependency property.
LazyLoadingThresholdProperty	Identifies the LazyLoadingThreshold dependency property.
LoadedState	Loaded state name in template
LoadingState	Loading state name in template
PartImage	Image name in template
PlaceholderSourceProperty	Identifies the PlaceholderSource dependency property.
PlaceholderStretchProperty	Identifies the PlaceholderStretch dependency property.
SourceProperty	Identifies the Source dependency property.
StretchProperty	Identifies the Stretch dependency property.
UnloadedState	Unloaded state name in template

Properties

DecodePixelHeight	Gets or sets DecodePixelHeight for underlying bitmap
DecodePixelType	Gets or sets DecodePixelType for underlying bitmap
DecodePixelWidth	Gets or sets DecodePixelWidth for underlying bitmap
EnableLazyLoading	Gets or sets a value indicating whether gets or sets is lazy loading enable. (17763 or higher supported)
Image	Gets the backing image object
IsCacheEnabled	Gets or sets a value indicating whether gets or sets cache state
IsInitialized	Gets a value indicating whether control has been initialized.
LazyLoadingThreshold	Gets or sets a value indicating the threshold for triggering lazy loading.
PlaceholderSource	Gets or sets the placeholder source.
PlaceholderStretch	Gets or sets the placeholder stretch.
Source	Gets or sets the source used by the image
Stretch	Gets or sets the stretch behavior of the image
WaitUntilLoaded	Gets a value indicating whether the AlphaMask needs to be retrieved after the element has loaded.

Methods

AttachImageFailed(ExceptionRoutedEventHandler)	Attach image failed event handler
AttachImageOpened(RoutedEventHandler)	Attach image opened event handler
GetAlphaMask()	Returns a mask that represents the alpha channel of an image as a Windows.UI.Composition.CompositionBrush
OnApplyTemplate()	Update the visual state of the control when its template is changed.
OnImageFailed(Object, ExceptionRoutedEventArgs)	Underlying Windows.UI.Xaml.Controls.Image.ImageFailed event handler.
OnImageOpened(Object, RoutedEventArgs)	Underlying Windows.UI.Xaml.Controls.Image.ImageOpened event handler.
OnPlaceholderSourceChanged(DependencyPropertyChangedEventArgs)	Invoked when Placeholder source has changed
ProvideCachedResourceAsync(Uri, CancellationToken)	This method is provided in case a developer would like their own custom caching strategy for ImageExBase. By default it uses the built-in UWP cache provided by Windows.UI.Xaml.Media.Imaging.BitmapImage and the Image control itself. This method should return an Windows.UI.Xaml.Media.ImageSource value of the image specified by the provided uri parameter. A CancellationToken is provided in case the current request is invalidated (e.g. the container is recycled before the original image is loaded). The Toolkit also has an image cache helper which can be used as well: GetFromCacheAsync(Uri, Boolean, CancellationToken, List<KeyValuePair<String,Object>>) in ImageCache.
RemoveImageFailed(ExceptionRoutedEventHandler)	Remove Image Failed handler
RemoveImageOpened(RoutedEventHandler)	Remove image opened handler

Events

ImageExFailed	Event raised if the image failed loading.
ImageExInitialized	Event raised when the control is initialized.
ImageExOpened	Event raised when the image is successfully loaded and opened.