ClemensFischer/XAML-Map-Control
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Update MapBase.MapLayer.cs

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ClemensFischer 2025-08-12 23:02:11 +02:00
parent 21ac686843
commit ecd91faef2
1 changed files with 13 additions and 11 deletions
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24
MapControl/Shared/MapBase.MapLayer.cs
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@ -1,5 +1,4 @@
using System;
using System.Collections;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
@ -38,8 +37,11 @@ namespace MapControl
/// <summary>
/// Gets or sets the base map layer, which is added as first element to the Children collection.
/// If the layer implements IMapLayer (like MapTileLayer or MapImageLayer), its (non-null) MapBackground
/// and MapForeground property values are used for the MapBase Background and Foreground properties.
/// If the passed object is not a FrameworkElement, MapBase tries to locate a DataTemplate
/// resource for the object's type and generate a FrameworkElement from that DataTemplate.
/// If the FrameworkElement implements IMapLayer (like e.g. MapTileLayer or MapImageLayer),
/// its (non-null) MapBackground and MapForeground property values are used for the MapBase
/// Background and Foreground.
/// </summary>
public object MapLayer
{
@ -55,12 +57,11 @@ namespace MapControl
private void MapLayerPropertyChanged(object oldLayer, object newLayer)
{
var firstChild = Children.Cast<FrameworkElement>().FirstOrDefault();
if (oldLayer != null)
{
if (firstChild != null &&
(firstChild == oldLayer as FrameworkElement || firstChild.DataContext == oldLayer))
if (Children.Count > 0 &&
(Children[0] == oldLayer as FrameworkElement ||
((FrameworkElement)Children[0]).DataContext == oldLayer))
{
Children.RemoveAt(0);
}
@ -81,13 +82,14 @@ namespace MapControl
if (newLayer != null)
{
if (firstChild == null ||
firstChild != newLayer as FrameworkElement && firstChild.DataContext != newLayer)
if (Children.Count == 0 ||
(Children[0] != newLayer as FrameworkElement &&
((FrameworkElement)Children[0]).DataContext != newLayer))
{
Children.Insert(0, GetMapLayer(newLayer));
}
if (Children.Cast<FrameworkElement>().FirstOrDefault() is IMapLayer mapLayer)
if (Children[0] is IMapLayer mapLayer)
{
if (mapLayer.MapBackground != null)
{