ClemensFischer/XAML-Map-Control
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DependencyPropertyHelper

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ClemensFischer 2024-05-23 18:08:14 +02:00
parent c74c2b1fed
commit 8e82e0bcbd
25 changed files with 224 additions and 176 deletions
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26
MapControl/WPF/MapPath.WPF.cs
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@ -3,6 +3,7 @@
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
@ -19,8 +20,9 @@ namespace MapControl
Stretch = Stretch.None;
}
public static readonly DependencyProperty DataProperty = Path.DataProperty.AddOwner(
typeof(MapPath), new PropertyMetadata(null, DataPropertyChanged));
public static readonly DependencyProperty DataProperty =
DependencyPropertyHelper.AddOwner<MapPath, Geometry>(Path.DataProperty,
(path, oldValue, newValue) => path.DataPropertyChanged(oldValue, newValue));
public Geometry Data
{
@ -30,23 +32,19 @@ namespace MapControl
protected override Geometry DefiningGeometry => Data;
private static void DataPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
private void DataPropertyChanged(Geometry oldData, Geometry newData)
{
var data = (Geometry)e.NewValue;
// Check if data is actually a new Geometry.
//
if (data != null && !ReferenceEquals(data, e.OldValue))
if (newData != null && !ReferenceEquals(newData, oldData))
{
var path = (MapPath)obj;
if (data.IsFrozen)
if (newData.IsFrozen)
{
path.Data = data.Clone(); // DataPropertyChanged called again
Data = newData.Clone(); // DataPropertyChanged called again
}
else
{
path.UpdateData();
UpdateData();
}
}
}
@ -65,14 +63,14 @@ namespace MapControl
#region Methods used only by derived classes MapPolyline, MapPolygon and MapMultiPolygon
protected void DataCollectionPropertyChanged(DependencyPropertyChangedEventArgs e)
protected void DataCollectionPropertyChanged(IEnumerable oldValue, IEnumerable newValue)
{
if (e.OldValue is INotifyCollectionChanged oldCollection)
if (oldValue is INotifyCollectionChanged oldCollection)
{
CollectionChangedEventManager.RemoveListener(oldCollection, this);
}
if (e.NewValue is INotifyCollectionChanged newCollection)
if (newValue is INotifyCollectionChanged newCollection)
{
CollectionChangedEventManager.AddListener(newCollection, this);
}