mirror of https://github.com/dahall/Vanara.git
126 lines
3.0 KiB
C#
126 lines
3.0 KiB
C#
using System.Drawing;
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using System.Windows.Forms;
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namespace Vanara.Windows.Forms;
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/// <summary>Represents an image used within a control.</summary>
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public class ControlImage
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{
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private Image? image;
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private string imageKey = string.Empty;
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private ImageList? imageList;
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private int index = -1;
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private bool useIntegerIndex = true;
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/// <summary>Initializes a new instance of the <see cref="ControlImage"/> class.</summary>
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/// <param name="parent">The parent.</param>
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public ControlImage(Control parent) => Control = parent;
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/// <summary>Gets or sets the image.</summary>
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/// <value>The image.</value>
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public virtual Image? Image
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{
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get
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{
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if (image == null && imageList != null)
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{
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int actualIndex = ActualIndex;
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if (actualIndex >= imageList.Images.Count)
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actualIndex = imageList.Images.Count - 1;
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if (actualIndex >= 0)
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return imageList.Images[actualIndex];
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}
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return image;
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}
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set
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{
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if (image == value) return;
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image = value;
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if (image != null)
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{
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ImageIndex = -1;
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ImageList = null;
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Control?.Invalidate();
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}
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}
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}
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/// <summary>Gets or sets the index of the image.</summary>
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/// <value>The index of the image.</value>
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/// <exception cref="ArgumentOutOfRangeException">ImageIndex</exception>
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public virtual int ImageIndex
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{
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get
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{
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if (index != -1 && imageList != null && index >= imageList.Images.Count)
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return imageList.Images.Count - 1;
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return index;
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}
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set
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{
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if (value < -1) throw new ArgumentOutOfRangeException(nameof(ImageIndex));
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if (index == value) return;
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if (value != -1) image = null;
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imageKey = string.Empty;
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index = value;
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useIntegerIndex = true;
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Control?.Invalidate();
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}
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}
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/// <summary>Gets or sets the image key.</summary>
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/// <value>The image key.</value>
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public virtual string ImageKey
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{
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get => imageKey; set
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{
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if (imageKey == value) return;
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index = -1;
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if (value != null) image = null;
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imageKey = value ?? string.Empty;
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useIntegerIndex = false;
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Control?.Invalidate();
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}
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}
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/// <summary>Gets or sets the image list.</summary>
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/// <value>The image list.</value>
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public virtual ImageList? ImageList
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{
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get => imageList; set
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{
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if (imageList == value) return;
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if (imageList != null)
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imageList.RecreateHandle -= ImageListOnRecreateHandle;
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if (value != null)
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image = null;
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imageList = value;
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if (imageList != null)
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imageList.RecreateHandle += ImageListOnRecreateHandle;
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Control?.Invalidate();
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}
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}
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/// <summary>Gets the actual index.</summary>
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/// <value>The actual index.</value>
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protected virtual int ActualIndex
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{
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get
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{
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if (useIntegerIndex)
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return ImageIndex;
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if (ImageList != null)
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return ImageList.Images.IndexOfKey(ImageKey);
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return -1;
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}
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}
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/// <summary>Gets or sets the control.</summary>
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/// <value>The control.</value>
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protected Control Control { get; set; }
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private void ImageListOnRecreateHandle(object? sender, EventArgs eventArgs)
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{
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if (Control?.IsHandleCreated ?? false) Control.Invalidate();
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}
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} |