DisplayFeaturesProvider Class

Namespace: Meziantou.Framework.WebPlatform.Dom
Assembly: Meziantou.Framework.WebPlatform.dll
Package: Meziantou.Framework.WebPlatform 1.0.10
Source: ViewportSegments.cs
Available in package assets: net10.0net11.0

The display features of the screen of the device (https://drafts.csswg.org/css-viewport/#display-feature-override), of the browsing contexts that share a BrowsingContextOptions (ViewportSegmentsOptions.Provider). Set DisplayFeaturesProvider.DisplayFeatures to simulate a foldable device: the documents evaluate their media queries again and compute their styles again.

public class DisplayFeaturesProvider

Remarks

A provider can be shared by several browsing contexts, and used from any thread.

Constructors

Name	Description
DisplayFeaturesProvider()

DisplayFeaturesProvider()

ViewportSegments.cs

public DisplayFeaturesProvider()

No documentation is available.

Properties

Name	Description
DisplayFeatures	Gets or sets the display features of the screen (empty by default: the viewport has a single segment). The offsets are relative to the viewport of the top-level documents. Setting it updates the documents.

DisplayFeatures

ViewportSegments.cs

Gets or sets the display features of the screen (empty by default: the viewport has a single segment). The offsets are relative to the viewport of the top-level documents. Setting it updates the documents.

public IReadOnlyList<DisplayFeature> DisplayFeatures { get; set; }

Property value

IReadOnlyList<DisplayFeature>

Exceptions

ArgumentException: An offset or a mask length is negative or not finite.

Methods

Name	Description
GetDisplayFeatures()	Returns the display features of the screen. The default implementation returns `DisplayFeaturesProvider.DisplayFeatures`. It is called on the thread of an event loop, and must not block it.
OnDisplayFeaturesChanged()	Raises `DisplayFeaturesProvider.DisplayFeaturesChanged`, then updates the documents: their media queries are evaluated again (`change` events of the `MediaQueryList` objects) and their styles are computed again. It can be called from any thread.

GetDisplayFeatures()

ViewportSegments.cs

Returns the display features of the screen. The default implementation returns DisplayFeaturesProvider.DisplayFeatures. It is called on the thread of an event loop, and must not block it.

public virtual IReadOnlyList<DisplayFeature> GetDisplayFeatures()

Returns

IReadOnlyList<DisplayFeature>

OnDisplayFeaturesChanged()

ViewportSegments.cs

Raises DisplayFeaturesProvider.DisplayFeaturesChanged, then updates the documents: their media queries are evaluated again (change events of the MediaQueryList objects) and their styles are computed again. It can be called from any thread.

protected void OnDisplayFeaturesChanged()

Events

Name	Description
DisplayFeaturesChanged	Raised when the display features change (`DisplayFeaturesProvider.OnDisplayFeaturesChanged`).

DisplayFeaturesChanged

Raised when the display features change (DisplayFeaturesProvider.OnDisplayFeaturesChanged).

public event EventHandler? DisplayFeaturesChanged