117 lines
4.0 KiB
C#
117 lines
4.0 KiB
C#
using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Media;
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namespace Sicentury.Core.AttachedProperties
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{
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/// <summary>
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/// Adorner for the watermark
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/// </summary>
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internal class WatermarkAdorner : Adorner
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{
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#region Private Fields
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/// <summary>
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/// <see cref="ContentPresenter"/> that holds the watermark
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/// </summary>
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private readonly ContentPresenter _contentPresenter;
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#endregion
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#region Constructor
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/// <summary>
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/// Initializes a new instance of the <see cref="WatermarkAdorner"/> class
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/// </summary>
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/// <param name="adornedElement"><see cref="UIElement"/> to be adorned</param>
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/// <param name="watermark">The watermark</param>
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public WatermarkAdorner(UIElement adornedElement, object watermark) :
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base(adornedElement)
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{
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IsHitTestVisible = false;
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_contentPresenter = new ContentPresenter
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{
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Content = watermark,
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Opacity = 0.3,
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Margin = new Thickness(Control.Margin.Left + Control.Padding.Left,
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Control.Margin.Top + Control.Padding.Top, 0, 0)
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};
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if (Control is ItemsControl && !(Control is ComboBox))
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{
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_contentPresenter.VerticalAlignment = VerticalAlignment.Center;
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_contentPresenter.HorizontalAlignment = HorizontalAlignment.Center;
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}
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// Hide the control adorner when the adorned element is hidden
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var binding = new Binding("IsVisible")
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{
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Source = adornedElement,
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Converter = new BooleanToVisibilityConverter()
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};
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SetBinding(VisibilityProperty, binding);
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}
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#endregion
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#region Protected Properties
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/// <summary>
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/// Gets the number of children for the <see cref="ContainerVisual"/>.
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/// </summary>
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protected override int VisualChildrenCount => 1;
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#endregion
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#region Private Properties
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/// <summary>
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/// Gets the control that is being adorned
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/// </summary>
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private Control Control => (Control)AdornedElement;
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#endregion
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#region Protected Overrides
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/// <summary>
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/// Returns a specified child <see cref="Visual"/> for the parent <see cref="ContainerVisual"/>.
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/// </summary>
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/// <param name="index">A 32-bit signed integer that represents the index value of the child <see cref="Visual"/>. The value of index must be between 0 and <see cref="VisualChildrenCount"/> - 1.</param>
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/// <returns>The child <see cref="Visual"/>.</returns>
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protected override Visual GetVisualChild(int index)
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{
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return _contentPresenter;
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}
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/// <summary>
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/// Implements any custom measuring behavior for the adorner.
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/// </summary>
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/// <param name="constraint">A size to constrain the adorner to.</param>
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/// <returns>A <see cref="Size"/> object representing the amount of layout space needed by the adorner.</returns>
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protected override Size MeasureOverride(Size constraint)
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{
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// Here's the secret to getting the adorner to cover the whole control
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_contentPresenter.Measure(Control.RenderSize);
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return Control.RenderSize;
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}
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/// <summary>
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/// When overridden in a derived class, positions child elements and determines a size for a <see cref="FrameworkElement"/> derived class.
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/// </summary>
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/// <param name="finalSize">The final area within the parent that this element should use to arrange itself and its children.</param>
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/// <returns>The actual size used.</returns>
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protected override Size ArrangeOverride(Size finalSize)
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{
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_contentPresenter.Arrange(new Rect(finalSize));
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return finalSize;
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}
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#endregion
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}
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}
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