121 lines
4.6 KiB
C#
121 lines
4.6 KiB
C#
#region Apache License 2.0
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/*
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Nuclex Foundation libraries for .NET
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Copyright (C) 2002-2025 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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using System;
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using Avalonia;
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using Avalonia.Controls;
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namespace Nuclex.Avalonia {
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/// <summary>Additional properties that can be attached to Avalonia objects</summary>
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public static class Properties {
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#region class InvalidateMeasureOnChangeObserver
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/// <summary>
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/// Invalidates the calculated measurement of the control that is reporting
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/// a change to the property value
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/// </summary>
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private class InvalidateMeasureOnChangeObserver :
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IObserver<AvaloniaPropertyChangedEventArgs<object>> {
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/// <summary>The one and only instance you need</summary>
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public static readonly InvalidateMeasureOnChangeObserver Instance = new();
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/// <summary>Called after all observers have been notified successfully</summary>
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public void OnCompleted() {}
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/// <summary>Reports when the observed control encountered an error</summary>
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/// <param name="error">Error the observed control has encountered</param>
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public void OnError(Exception error) {}
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/// <summary>Reports the updated value of the property to the observer</summary>
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/// <param name="value">New value the property has assumed</param>
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public void OnNext(AvaloniaPropertyChangedEventArgs<object> value) {
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if(value.Sender is Control senderAsControl) {
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senderAsControl.InvalidateMeasure();
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}
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}
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}
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#endregion // class InvalidateMeasureOnChangeObserver
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/// <summary>
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/// Invalidates the object's measured size of a control and triggers a new layout pass
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/// </summary>
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/// <remarks>
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/// <para>
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/// If, for some reason, an Avalonia control whose size depends on a data-bound value
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/// (for example, a <Border /> that holds a <TextBlock /gt; that uses data
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/// binding) does not update its own size, that is an Avalonia bug.
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/// </para>
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/// <para>
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/// By attaching this property to the misbehaving control and data-binding its value
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/// to the trigger that should cause a reevaluation of its dimensions, you can work
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/// around the issue:
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/// </para>
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/// <example>
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/// <code>
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/// <Border
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/// CornerRadius="4"
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/// Padding="4,0"
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/// HorizontalAlignment="Center"
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/// nuclex:Properties.InvalidateMeasureOnChange="{Binding Status}"
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/// >
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/// <TextBlock
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/// HorizontalAlignment="Center"
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/// Text="{Binding Status}"
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/// />
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/// </Border>
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/// </code>
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/// </example>
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/// </remarks>
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public static readonly AttachedProperty<object> InvalidateMeasureOnChangeProperty = (
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AvaloniaProperty.RegisterAttached<Control, object>(
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"InvalidateMeasureOnChange",
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typeof(Properties),
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defaultValue: null!,
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inherits: false
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)
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);
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/// <summary>Initializes all static members of the class</summary>
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static Properties() {
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InvalidateMeasureOnChangeProperty.Changed.Subscribe(InvalidateMeasureOnChangeObserver.Instance);
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}
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/// <summary>Reads the value of the 'InvalidateMeasureOnChange' property</summary>
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/// <param name="control">Control from which the property will be read</param>
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/// <returns>The current value of the property attached to the control</returns>
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public static object GetInvalidateMeasureOnChange(Control control) {
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return control.GetValue(InvalidateMeasureOnChangeProperty);
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}
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/// <summary>Updates the value of the 'InvalidateMeasureOnChange' property</summary>
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/// <param name="control">Control on which the property will be updated</param>
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/// <param name="value">New value to assign to the attached property</param>
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public static void SetInvalidateMeasureOnChange(Control control, object value) {
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control.SetValue(InvalidateMeasureOnChangeProperty, value);
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}
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}
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} // namespace Nuclex.Avalonia
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