TileOverlay &para;

Remarks:

Increasing this value can reduce blank areas during pan gestures because tiles just outside the viewport are already drawn. The default value is 0.

CurrentZoomTileCacheCapacity¶

Gets or sets the maximum number of current zoom tile views retained in memory.

public int CurrentZoomTileCacheCapacity { get; set; }

Property Value¶

Remarks:

Retained tile views can be reused during pan gestures to reduce blank areas while newly requested tiles are still drawing. The default value is 8.

ZoomOutTileCacheCapacity¶

Gets or sets the maximum number of zoom-out tile views retained in memory.

public int ZoomOutTileCacheCapacity { get; set; }

Property Value¶

Remarks:

Retained zoom-out tile views can be stretched temporarily during zoom or fast pan gestures until current zoom tiles are available. The default value is 16.

MaxConcurrentTileDraws¶

Maximum number of tiles drawn concurrently per refresh in MultiTile mode. Defaults to int.MaxValue (unbounded) to match historical behavior. Lower it (for example to 4 or 8) to cap memory and threadpool pressure on slow networks or low-memory devices. Mirrors ThinkGeo.UI.Desktop.TileOverlay.MaxConcurrentTileDraws.

public int MaxConcurrentTileDraws { get; set; }

Property Value¶

Remarks:

The cap covers both the per-tile draw stage and the subsequent post-to-UI stage of a single refresh. Has no effect on SingleTile rendering.

Tile drawing (Skia bitmap allocation and path rendering) is CPU-bound work, so strictly speaking this knob caps the degree of parallelism, not just concurrency. The "Concurrent" name is kept to align with the related throttles elsewhere in the SDK (MaxConcurrentTileLoads, MaxConcurrentRequests) so a single autocomplete prefix surfaces them together.

TileCache¶

Gets or sets the tile cache.

public RasterTileCache TileCache { get; set; }

Property Value¶

RasterTileCache
The tile cache.

TileType¶

Gets and sets the overlay is formed by multiple tiles or single tile.

public TileType TileType { get; set; }

Property Value¶

TileType
The type of the tile.

TransitionEffect¶

Gets or sets the tile transition effect.

public TransitionEffect TransitionEffect { get; set; }

Property Value¶

TransitionEffect
The tile snapping mode.

RenderingOptions¶

Gets or sets all Skia rendering options applied when tiles are drawn.

public RenderingOptions RenderingOptions { get; set; }

Property Value¶

RenderingOptions

ZoomLevelSet¶

Gets or sets the ZoomLevelSet for the TileOverlay. By default, this will snap to the scales defined in the ZoomLevelSet to fetch the internal data.

public ZoomLevelSet ZoomLevelSet { get; set; }

Property Value¶

ZoomLevelSet

Remarks:

Ensure that the ZoomLevelSet scales align with those of the tile provider, especially when using third-party data.

Name¶

Gets or sets the name of this overlay.

public string Name { get; set; }

Property Value¶

Attribution¶

Gets the attribution text displayed for this overlay.

public string Attribution { get; protected set; }

Property Value¶

Remarks:

Set by derived overlays to describe the data source rendered on the map.

DrawingExceptionMode¶

This property gets and sets the DrawingExceptionMode used when an exception occurs during drawing.

public DrawingExceptionMode DrawingExceptionMode { get; set; }

Property Value¶

DrawingExceptionMode
The drawing exception mode.

IsEmpty¶

This property gets if this overlay is empty or not.

public bool IsEmpty { get; }

Property Value¶

Remarks:

This property enhances the performance of the overlay while drawing. If is true, we will skip drawing this overlay and continue drawing the next overlay.

Children¶

public IList<IView> Children { get; }

Property Value¶

IList<IView>

Count¶

public int Count { get; }

Property Value¶

IsReadOnly¶

public bool IsReadOnly { get; }

Property Value¶

Item¶

public IView Item { get; set; }

Property Value¶

IView

IsClippedToBounds¶

public bool IsClippedToBounds { get; set; }

Property Value¶

Padding¶

public Thickness Padding { get; set; }

Property Value¶

Thickness

SafeAreaEdges¶

public SafeAreaEdges SafeAreaEdges { get; set; }

Property Value¶

SafeAreaEdges

IgnoreSafeArea¶

public bool IgnoreSafeArea { get; set; }

Property Value¶

CascadeInputTransparent¶

public bool CascadeInputTransparent { get; set; }

Property Value¶

IList<IGestureRecognizer>

GestureRecognizers¶

public IList<IGestureRecognizer> GestureRecognizers { get; }

Property Value¶

HorizontalOptions¶

public LayoutOptions HorizontalOptions { get; set; }

Property Value¶

LayoutOptions

Margin¶

public Thickness Margin { get; set; }

Property Value¶

Thickness

VerticalOptions¶

public LayoutOptions VerticalOptions { get; set; }

Property Value¶

LayoutOptions

Visual¶

public IVisual Visual { get; set; }

Property Value¶

IVisual

FlowDirection¶

public FlowDirection FlowDirection { get; set; }

Property Value¶

FlowDirection

Window¶

public Window Window { get; }

Property Value¶

Window

AnchorX¶

public double AnchorX { get; set; }

Property Value¶

AnchorY¶

public double AnchorY { get; set; }

Property Value¶

BackgroundColor¶

public Color BackgroundColor { get; set; }

Property Value¶

Color

Background¶

public Brush Background { get; set; }

Property Value¶

Brush

Behaviors¶

public IList<Behavior> Behaviors { get; }

Property Value¶

IList<Behavior>

Bounds¶

public Rect Bounds { get; }

Property Value¶

Rect

Height¶

public double Height { get; }

Property Value¶

HeightRequest¶

public double HeightRequest { get; set; }

Property Value¶

InputTransparent¶

public bool InputTransparent { get; set; }

Property Value¶

IsEnabled¶

public bool IsEnabled { get; set; }

Property Value¶

IsFocused¶

public bool IsFocused { get; }

Property Value¶

IsVisible¶

public bool IsVisible { get; set; }

Property Value¶

MinimumHeightRequest¶

public double MinimumHeightRequest { get; set; }

Property Value¶

MinimumWidthRequest¶

public double MinimumWidthRequest { get; set; }

Property Value¶

MaximumHeightRequest¶

public double MaximumHeightRequest { get; set; }

Property Value¶

MaximumWidthRequest¶

public double MaximumWidthRequest { get; set; }

Property Value¶

Opacity¶

public double Opacity { get; set; }

Property Value¶

Rotation¶

public double Rotation { get; set; }

Property Value¶

RotationX¶

public double RotationX { get; set; }

Property Value¶

RotationY¶

public double RotationY { get; set; }

Property Value¶

Scale¶

public double Scale { get; set; }

Property Value¶

ScaleX¶

public double ScaleX { get; set; }

Property Value¶

ScaleY¶

public double ScaleY { get; set; }

Property Value¶

TranslationX¶

public double TranslationX { get; set; }

Property Value¶

TranslationY¶

public double TranslationY { get; set; }

Property Value¶

Triggers¶

public IList<TriggerBase> Triggers { get; }

Property Value¶

IList<TriggerBase>

Width¶

public double Width { get; }

Property Value¶

WidthRequest¶

public double WidthRequest { get; set; }

Property Value¶

X¶

public double X { get; }

Property Value¶

Y¶

public double Y { get; }

Property Value¶

Clip¶

public Geometry Clip { get; set; }

Property Value¶

Geometry

Batched¶

public bool Batched { get; }

Property Value¶

DisableLayout¶

public bool DisableLayout { get; set; }

Property Value¶

IsInPlatformLayout¶

public bool IsInPlatformLayout { get; set; }

Property Value¶

IsPlatformStateConsistent¶

public bool IsPlatformStateConsistent { get; set; }

Property Value¶

IsPlatformEnabled¶

public bool IsPlatformEnabled { get; set; }

Property Value¶

Resources¶

public ResourceDictionary Resources { get; set; }

Property Value¶

ResourceDictionary

Frame¶

public Rect Frame { get; set; }

Property Value¶

Rect

Handler¶

public IViewHandler Handler { get; set; }

Property Value¶

IViewHandler

Shadow¶

public Shadow Shadow { get; set; }

Property Value¶

Shadow

ZIndex¶

public int ZIndex { get; set; }

Property Value¶

DesiredSize¶

public Size DesiredSize { get; protected set; }

Property Value¶

Size

IsLoaded¶

public bool IsLoaded { get; }

Property Value¶

public INavigation Navigation { get; internal set; }

Property Value¶

INavigation

NavigationProxy¶

public NavigationProxy NavigationProxy { get; }

Property Value¶

NavigationProxy

Style¶

public Style Style { get; set; }

Property Value¶

Style

StyleClass¶

public IList<string> StyleClass { get; set; }

Property Value¶

IList<string>

class¶

public IList<string> class { get; set; }

Property Value¶

IList<string>

AutomationId¶

public string AutomationId { get; set; }

Property Value¶

ClassId¶

public string ClassId { get; set; }

Property Value¶

Effects¶

public IList<Effect> Effects { get; }

Property Value¶

IList<Effect>

Id¶

public Guid Id { get; }

Property Value¶

Guid

StyleId¶

public string StyleId { get; set; }

Property Value¶

ReadOnlyCollection<Element>

LogicalChildren¶

public ReadOnlyCollection<Element> LogicalChildren { get; }

Property Value¶

RealParent¶

public Element RealParent { get; }

Property Value¶

Element

Parent¶

public Element Parent { get; set; }

Property Value¶

Element

EffectControlProvider¶

public IEffectControlProvider EffectControlProvider { get; set; }

Property Value¶

IEffectControlProvider

Handler¶

public IElementHandler Handler { get; set; }

Property Value¶

IElementHandler

Dispatcher¶

public IDispatcher Dispatcher { get; }

Property Value¶

IDispatcher

BindingContext¶

public object BindingContext { get; set; }

Property Value¶

object

Methods¶

GetOneTile()¶

Retrieves the tile currently tracked by the overlay, if one exists.

public TileView GetOneTile()

Returns¶

TileView
The tracked tile view, or null if no tile is available.

GetTile()¶

Chooses a tile object to form the TileOverlay.

When overriding this method, consider the initialize parameters setting on the tile.

protected TileView GetTile()

Returns¶

TileView

GetTileCore()¶

Chooses a tile object to form the TileOverlay. When overriding this method, consider the initialize parameters setting on the tile.

protected abstract TileView GetTileCore()

Returns¶

TileView
A tile object to form the TileOverlay.

DrawAsyncCore(OverlayRefreshType, CancellationToken)¶

Draws current overlay

protected Task DrawAsyncCore(OverlayRefreshType refreshType, CancellationToken cancellationToken)

Parameters¶

refreshType OverlayRefreshType
Type of the refresh.

cancellationToken CancellationToken
The token to monitor the cancellation requests.

Returns¶

DrawWithoutPostingAsyncCore(OverlayRefreshType, CancellationToken)¶

Draws current overlay to tile images, without posting those images to the TileViews. This method will be invoked if map's AnimationType is MapAnimationType.DrawWithAnimation

protected Task DrawWithoutPostingAsyncCore(OverlayRefreshType refreshType, CancellationToken cancellationToken)

Parameters¶

refreshType OverlayRefreshType
Type of the refresh.

cancellationToken CancellationToken
The token to monitor the cancellation requests.

Returns¶

TransformCore(RectangleShape, IMapView)¶

Posts the transform for the TileOverlay.

protected void TransformCore(RectangleShape extent, IMapView mapView)

Parameters¶

extent RectangleShape
This parameter maintains the target extent of the transformation.

mapView IMapView
The map arguments.

Returns¶

PostAsyncCore(CancellationToken)¶

Post the drawn image to the overlay

protected Task PostAsyncCore(CancellationToken cancellationToken)

Parameters¶

cancellationToken CancellationToken
The token to monitor the cancellation requests.

Returns¶

A(RectangleShape, double, int)¶

internal RectangleShape A(RectangleShape , double , int )

Parameters¶

`` RectangleShape

`` double

`` int

Returns¶

RectangleShape

OnDrawingTile(DrawingTileTileOverlayEventArgs)¶

Raise the DrawingTile event

protected void OnDrawingTile(DrawingTileTileOverlayEventArgs e)

Parameters¶

e DrawingTileTileOverlayEventArgs
The EventArgs for DrawingTile event

Returns¶

OnPostedTile(PostedTileTileOverlayEventArgs)¶

Raise the PostedTile event

protected void OnPostedTile(PostedTileTileOverlayEventArgs e)

Parameters¶

e PostedTileTileOverlayEventArgs
The EventArgs for PostedTile event

Returns¶

c()¶

internal void c()

Returns¶

Dispose(bool)¶

Releases unmanaged and - optionally - managed resources.

protected void Dispose(bool disposing)

Parameters¶

disposing bool
true to release both managed and unmanaged resources; false to release only unmanaged resources.

Returns¶

GetTileMatrixCore(double, int, int, GeographyUnit)¶

Gets the tile matrix for TileOverlay.

protected TileMatrix GetTileMatrixCore(double scale, int tileWidth, int tileHeight, GeographyUnit boundingBoxUnit)

Parameters¶

scale double
The scale.

tileWidth int
Width of the tile.

tileHeight int
Height of the tile.

boundingBoxUnit GeographyUnit
The bounding box unit.

Returns¶

TileMatrix
TileMatrix.

OnCreatingSKTypefaceForCharacterEventArgs(CreatingSKTypefaceForCharacterEventArgs)¶

Invokes TileOverlay.CreatingSKTypefaceForCharacter so consumers can supply a fallback typeface for the current glyph request.

protected void OnCreatingSKTypefaceForCharacterEventArgs(CreatingSKTypefaceForCharacterEventArgs e)

Parameters¶

e CreatingSKTypefaceForCharacterEventArgs
Details about the requested character and a place to provide the replacement typeface.

Returns¶

ClearTiles()¶

Clears the tiles.

public void ClearTiles()

Returns¶

A(List<Task>)¶

internal static Task A(List<Task> )

Parameters¶

`` List<Task>

Returns¶

a(List<Task>)¶

internal static Task a(List<Task> )

Parameters¶

`` List<Task>

Returns¶