layout: default title: Constraints parent: Core Classes —
dymaptic.GeoBlazor.Core
dymaptic.GeoBlazor.Core.Components
Constraints Class
Specifies constraints to scale, zoom, and rotation that may be applied to the MapView. The constraints.lods should
be set in the MapView constructor, if the map does not have a basemap or when the basemap does not have tileInfo.
ArcGIS Maps SDK for JavaScript
public class Constraints : dymaptic.GeoBlazor.Core.Components.MapComponent
Inheritance System.Object 🡒 Microsoft.AspNetCore.Components.ComponentBase 🡒 MapComponent 🡒 Constraints
Properties
Constraints.Geometry Property
The area in which the user is allowed to navigate laterally. Only Extent and Polygon geometry types are supported.
Z-values are ignored.
public dymaptic.GeoBlazor.Core.Components.Geometries.Geometry? Geometry { get; set; }
Property Value
Constraints.Lods Property
An array of LODs. If not specified, this value is read from the Map.
public System.Collections.Generic.List<dymaptic.GeoBlazor.Core.Components.LOD>? Lods { get; set; }
Property Value
System.Collections.Generic.List<LOD>
Constraints.MaxScale Property
The maximum scale the user is allowed to zoom to within the view. Setting this value to 0 allows the user to
overzoom layer tiles.
public System.Nullable<double> MaxScale { get; set; }
Property Value
System.Nullable<System.Double>
Constraints.MaxZoom Property
The maximum zoom level the user is allowed to zoom to within the view. Setting this value to 0 allows the user to
over-zoom layer tiles.
public System.Nullable<double> MaxZoom { get; set; }
Property Value
System.Nullable<System.Double>
Constraints.MinScale Property
The minimum scale the user is allowed to zoom to within the view.
public System.Nullable<double> MinScale { get; set; }
Property Value
System.Nullable<System.Double>
Constraints.MinZoom Property
The minimum zoom level the user is allowed to zoom to within the view.
public System.Nullable<double> MinZoom { get; set; }
Property Value
System.Nullable<System.Double>
Constraints.RotationEnabled Property
Indicates whether the user can rotate the map. If not set, defaults to true.
public System.Nullable<bool> RotationEnabled { get; set; }
Property Value
System.Nullable<System.Boolean>
Constraints.SnapToZoom Property
When true, the view snaps to the next LOD when zooming in or out. When false, the zoom is continuous. This does not
apply when zooming in/out using two finger pinch in/out.
public System.Nullable<bool> SnapToZoom { get; set; }
Property Value
System.Nullable<System.Boolean>
Methods
Constraints.RegisterChildComponent(MapComponent) Method
Called from dymaptic.GeoBlazor.Core.Components.MapComponent.OnInitializedAsync to “Register” the current component with it’s parent.
public override System.Threading.Tasks.Task RegisterChildComponent(dymaptic.GeoBlazor.Core.Components.MapComponent child);
Parameters
child MapComponent
The calling, child component to register
Returns
Exceptions
InvalidChildElementException
Throws if the current child is not a valid sub-component to the parent.
Remarks
This method is an implementation detail and should not be called directly by consumers. In future versions, this may be changed to an internal method. If you see no other way to register a child component, please open an issue on GitHub.
Constraints.UnregisterChildComponent(MapComponent) Method
Undoes the “Registration” of a child with its parent.
public override System.Threading.Tasks.Task UnregisterChildComponent(dymaptic.GeoBlazor.Core.Components.MapComponent child);
Parameters
child MapComponent
The child to unregister
Returns
Remarks
This method is an implementation detail and should not be called directly by consumers. In future versions, this may be changed to an internal method.