I have an MVVM project with many ResourceDictionaries. I can already animate colour resources and dynamically change brushes. Updating works. Unfortunately, "relinking" a DynamicResource does not work. My goal is to swap Brush="{DynamicResource Process4}" to Brush="{DynamicResource Process6}" in the resource "IPC" by code. The solution must be dynamic. The best would be a binding directly to a property of my ViewModel.
I have already tried Brush="{DynamicResource Processes}" in IPC, but updating the ProcessesMask property did not update IPC.
public class ViewModel : ViewModelBase
{
private Brush _ProcessesMask = GetAppResObject<DrawingBrush>("Process9");
public Brush ProcessesMask
{
get
{
return _ProcessesMask;
}
set
{
_ProcessesMask = Value;
PropertyChanged("ProcessesMask");
}
}
private T GetAppResObject<T>(string resourceKey)
{
try
{
object value = Windows.Application.Current.FindResource(resourceKey);
if (value is T)
return (T)value;
else
return default(T);
}
catch (Exception ex)
{
Logger.Append($"{typeof(T).Name} not found in the resources: {resourceKey}");
return default(T);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen00"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen01"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen02"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen10"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen11"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen12"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen20"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen21"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen22"></SolidColorBrush>
<DrawingBrush x:Key="Processes" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{Binding ViewModel.ProcessesMask, UpdateSourceTrigger=PropertyChanged}" Geometry="F1 M 0.220913,0.220886L 164.221,0.220886L 164.221,104.221L 0.220913,104.221L 0.220913,0.220886 Z "/>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process4" Stretch="Uniform" >
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.6668,-3.8147e-005L 75.3332,-3.8147e-005C 76.806,-3.8147e-005 78,1.19395 78,2.66677L 78,45.3332C 78,46.806 76.806,48 75.3332,48L 2.6668,48C 1.19397,48 -6.70045e-006,46.806 -6.70045e-006,45.3332L -6.70045e-006,2.66677C -6.70045e-006,1.19395 1.19397,-3.8147e-005 2.6668,-3.8147e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 88.6668,7.62939e-006L 161.333,7.62939e-006C 162.806,7.62939e-006 164,1.19397 164,2.66679L 164,45.3332C 164,46.806 162.806,48 161.333,48L 88.6668,48C 87.194,48 86,46.806 86,45.3332L 86,2.66679C 86,1.19397 87.194,7.62939e-006 88.6668,7.62939e-006 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206829" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 2.6668,56L 75.3332,56C 76.8061,56 78,57.194 78,58.6668L 78,101.333C 78,102.806 76.8061,104 75.3332,104L 2.6668,104C 1.19397,104 -5.2378e-006,102.806 -5.2378e-006,101.333L -5.2378e-006,58.6668C -5.2378e-006,57.194 1.19397,56 2.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 88.6668,56L 161.333,56C 162.806,56 164,57.1939 164,58.6667L 164,101.333C 164,102.806 162.806,104 161.333,104L 88.6668,104C 87.194,104 86,102.806 86,101.333L 86,58.6667C 86,57.1939 87.194,56 88.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.207383" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process6" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.66679,-3.8147e-005L 47.3332,-3.8147e-005C 48.806,-3.8147e-005 50,1.19395 50,2.66677L 50,45.3332C 50,46.806 48.806,48 47.3332,48L 2.66679,48C 1.19397,48 -3.58676e-006,46.806 -3.58676e-006,45.3332L -3.58676e-006,2.66677C -3.58676e-006,1.19395 1.19397,-3.8147e-005 2.66679,-3.8147e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 59.6668,9.15527e-005L 104.333,9.15527e-005C 105.806,9.15527e-005 107,1.19405 107,2.66688L 107,45.3333C 107,46.8062 105.806,48.0001 104.333,48.0001L 59.6668,48.0001C 58.194,48.0001 57,46.8062 57,45.3333L 57,2.66688C 57,1.19405 58.194,9.15527e-005 59.6668,9.15527e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.204468" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen02}" Geometry="F1 M 2.66676,56.0001L 47.3332,56.0001C 48.806,56.0001 50,57.1941 50,58.6669L 50,101.333C 50,102.806 48.806,104 47.3332,104L 2.66676,104C 1.19393,104 -3.62374e-005,102.806 -3.62374e-005,101.333L -3.62374e-005,58.6669C -3.62374e-005,57.1941 1.19393,56.0001 2.66676,56.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 59.6668,56L 104.333,56C 105.806,56 107,57.194 107,58.6668L 107,101.333C 107,102.806 105.806,104 104.333,104L 59.6668,104C 58.194,104 57,102.806 57,101.333L 57,58.6668C 57,57.194 58.194,56 59.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.207383" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 116.667,5.34058e-005L 161.333,5.34058e-005C 162.806,5.34058e-005 164,1.19401 164,2.66684L 164,45.3333C 164,46.8061 162.806,48.0001 161.333,48.0001L 116.667,48.0001C 115.194,48.0001 114,46.8061 114,45.3333L 114,2.66684C 114,1.19401 115.194,5.34058e-005 116.667,5.34058e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.204468" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen12}" Geometry="F1 M 116.667,56L 161.333,56C 162.806,56 164,57.194 164,58.6668L 164,101.333C 164,102.806 162.806,104 161.333,104L 116.667,104C 115.194,104 114,102.806 114,101.333L 114,58.6668C 114,57.194 115.194,56 116.667,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.205016" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process9" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.66681,-5.34058e-005L 47.3332,-5.34058e-005C 48.806,-5.34058e-005 50,1.19392 50,2.66675L 50,29.3331C 50,30.806 48.806,32 47.3332,32L 2.66681,32C 1.19398,32 1.56308e-005,30.806 1.56308e-005,29.3331L 1.56308e-005,2.66675C 1.56308e-005,1.19392 1.19398,-5.34058e-005 2.66681,-5.34058e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 2.66678,36L 47.3332,36C 48.806,36 50,37.1939 50,38.6668L 50,65.3331C 50,66.806 48.806,68 47.3332,68L 2.66678,68C 1.19395,68 -1.81472e-005,66.806 -1.81472e-005,65.3331L -1.81472e-005,38.6668C -1.81472e-005,37.1939 1.19395,36 2.66678,36 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen02}" Geometry="F1 M 2.6668,72.0001L 47.3332,72.0001C 48.806,72.0001 50,73.194 50,74.6668L 50,101.333C 50,102.806 48.806,104 47.3332,104L 2.6668,104C 1.19398,104 8.08905e-006,102.806 8.08905e-006,101.333L 8.08905e-006,74.6668C 8.08905e-006,73.194 1.19398,72.0001 2.6668,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 116.667,-9.15527e-005L 161.333,-9.15527e-005C 162.806,-9.15527e-005 164,1.19388 164,2.66671L 164,29.3331C 164,30.806 162.806,31.9999 161.333,31.9999L 116.667,31.9999C 115.194,31.9999 114,30.806 114,29.3331L 114,2.66671C 114,1.19388 115.194,-9.15527e-005 116.667,-9.15527e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 116.667,35.9999L 161.333,35.9999C 162.806,35.9999 164,37.1939 164,38.6667L 164,65.3331C 164,66.806 162.806,67.9999 161.333,67.9999L 116.667,67.9999C 115.194,67.9999 114,66.806 114,65.3331L 114,38.6667C 114,37.1939 115.194,35.9999 116.667,35.9999 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen12}" Geometry="F1 M 116.667,72.0001L 161.333,72.0001C 162.806,72.0001 164,73.194 164,74.6669L 164,101.333C 164,102.806 162.806,104 161.333,104L 116.667,104C 115.194,104 114,102.806 114,101.333L 114,74.6669C 114,73.194 115.194,72.0001 116.667,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen20}" Geometry="F1 M 62.6668,-0.0001297L 107.333,-0.0001297C 108.806,-0.0001297 110,1.19384 110,2.66666L 110,29.3331C 110,30.806 108.806,31.9999 107.333,31.9999L 62.6668,31.9999C 61.194,31.9999 60,30.806 60,29.3331L 60,2.66666C 60,1.19384 61.194,-0.0001297 62.6668,-0.0001297 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen21}" Geometry="F1 M 62.6668,35.9999L 107.333,35.9999C 108.806,35.9999 110,37.1939 110,38.6667L 110,65.3331C 110,66.8059 108.806,67.9999 107.333,67.9999L 62.6668,67.9999C 61.194,67.9999 60,66.8059 60,65.3331L 60,38.6667C 60,37.1939 61.194,35.9999 62.6668,35.9999 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen22}" Geometry="F1 M 62.6668,72.0001L 107.333,72.0001C 108.806,72.0001 110,73.1941 110,74.6669L 110,101.333C 110,102.806 108.806,104 107.333,104L 62.6668,104C 61.194,104 60,102.806 60,101.333L 60,74.6669C 60,73.1941 61.194,72.0001 62.6668,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="#FFFF0000" Geometry="F1 M 54.5,-2.28882e-005L 55.5,-2.28882e-005C 56.0523,-2.28882e-005 56.5,0.447784 56.5,1L 56.5,103C 56.5,103.552 56.0523,104 55.5,104L 54.5,104C 53.9477,104 53.5,103.552 53.5,103L 53.5,1C 53.5,0.447784 53.9477,-2.28882e-005 54.5,-2.28882e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="IPC" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="#00000000" Geometry="F1 M 0,-0.000213623L 348,-0.000213623L 348,278L 0,278L 0,-0.000213623 Z "/>
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<GeometryDrawing.Pen>
<Pen Thickness="2.06475" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="#FFFFFFFF" Geometry="F1 M 73.6854,193.936L 274.238,193.936C 274.607,193.936 274.905,194.234 274.905,194.603L 274.905,212.134C 274.905,212.502 274.607,212.801 274.238,212.801L 73.6854,212.801C 73.3172,212.801 73.0187,212.502 73.0187,212.134L 73.0187,194.603C 73.0187,194.234 73.3172,193.936 73.6854,193.936 Z ">
<GeometryDrawing.Pen>
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<GeometryDrawing Brush="{DynamicResource Process4}" Geometry="F1 M 93.0001,76.0001L 255,76.0001L 255,181L 93.0001,181L 93.0001,76.0001 Z "/>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</ResourceDictionary>
CodePudding user response：
You definitely don't want to manage view resources in your view model. And you don't want to change the reference key itself: this would mean you would have to rebuild all elements/XAML to update the referenced resource key.
You want to use the same resource key e.g. DynamicBrushKey and change the resource e.g., a Color it references.
If you have direct access to the ResourceDictionary that defines the resources e.g., via the owning element or MergedDictionary, you can freeze them to improve the performance. You can also reference the Color resources using StaticResource, which further improves the performance.
Since your have to handle th resource keys in code-behind, I suggest to create static resource keys to avoid magic strings. This also simplifies refactoring. Those static keys can be defined in any class.
MainWindow.xaml.cs
partial class MainWindow : Window
{
public static ResourceKey DynamicBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "DynamicBackgroundBrush");
public static ResourceKey BlueColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "BlueColorResource");
public static ResourceKey RedColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "RedColorResource");
private void AddResourcesDynamically()
{
// Get the ResourceDictionary or dictionaries that should define the resources
ResourceDictionary resources = Application.Current.Resources;
resources[<new_key>] = Colors.Green;
}
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.DynamicBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.DynamicBrushKey));
var dynamicBrush = resources[MainWindow.DynamicBrushKey] as SolidColorBrush;
var newColor = (Color)resources[MainWindow.BlueColorResourceKey];
if (dynamicBrush.IsFrozen)
{
dynamicBrush = dynamicBrush.Clone();
}
dynamicBrush.Color = newColor;
dynamicBrush.Freeze();
resources[MainWindow.DynamicBrushKey] = dynamicBrush;
}
// Resource should not be frozen i.e. referenced using DynamicResource
private void ChangeDynamicResourcesOfUnknownResourceDictionay()
{
var dynamicBrush = FindResource(MainWindow.DynamicBrushKey) as SolidColorBrush;
if (dynamicBrush.IsFrozen)
{
return;
}
var newColor = (Color)FindResource(MainWindow.BlueColorResourceKey);
dynamicBrush.Color = newColor;
}
}
MainWindow.xaml
<Window>
<Rectangle Fill="{DynamicResource {x:Static local:MainWindow.DynamicBrushKey}}"
Height="100" Width="100" />
</Window>
Colors.xaml
<ResourceDictionary>
<Color x:Key="{x:Static local:MainWindow.RedColorResourceKey}">Red</Color>
<Color x:Key="{x:Static local:MainWindow.BlueColorResourceKey}">Blue</Color>
<!-- The dynamic Brush resource -->
<SolidColorBrush x:Key="{x:Static local:MainWindow.DynamicBrushKey}" Color="{StaticResource {x:Static local:MainWindow.RedColorResourceKey}}" />
</ResourceDictionary>
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Example more specific to the question
public static ResourceKey ProcessBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "ProcessBrush");
public static ResourceKey Process4ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process4Brush");
public static ResourceKey Process6ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process6Brush");
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Colors.xaml
<DrawingBrush x:Key="IPC" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing ... />
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ... />
<!-- Reference the dynamically changing resource -->
<GeometryDrawing Brush="{DynamicResource {x:Static local:MainWindow.ProcessBrushKey}}" ... />
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<!--
The dynamic resources that will replace the dynamic placeholder ProcessBrushKey DynamicResource reference in the IPC Brush
-->
<DrawingBrush x:Key="{x:Static local:MainWindow.Process4ResourceBrushKey}" ...>
...
</DrawingBrush>
<DrawingBrush x:Key="{x:Static local:MainWindow.Process6ResourceBrushKey}" ...>
...
</DrawingBrush>
<!-- The placeholder Brush that is referenced by the IPC Brush
and itself references the Process4 Brush by default.
This refernce is later dynamically overridden (see below).
Alternatively remove this brush and initialize the resource key on
application startup -->
<DrawingBrush x:Key="{x:Static local:MainWindow.ProcessBrushKey}"
Drawing="{Binding Source={StaticResource {x:Static local:MainWindow.Process4ResourceBrushKey}}, Path=Drawing}" ...>
...
</DrawingBrush>
The actual resource swapping
// Sets the IPC Brush reference to Process6 Brush
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.Process6ResourceBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.Process6ResourceBrushKey));
var process6Brush = resources[MainWindow.Process6ResourceBrushKey] as Brush;
if (process6Brush.CanFreeze && !process6Brush.IsFrozen)
{
process6Brush.Freeze();
}
// Change the resource that is registered with the ProcessBrushKey resource key,
// which is referenced by the "IPC" Brush
resources[MainWindow.ProcessBrushKey] = process6Brush;
}