mirror of
https://github.com/QL-Win/QuickLook.git
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238 lines
8.6 KiB
C#
238 lines
8.6 KiB
C#
// Copyright © 2017-2025 QL-Win Contributors
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//
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// This file is part of QuickLook program.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Windows;
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using System.Windows.Interop;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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namespace QuickLook.Plugin.ArchiveViewer;
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/// <summary>
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/// Internals are mostly from here:
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/// http://www.codeproject.com/Articles/2532/Obtaining-and-managing-file-and-folder-icons-using
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/// Caches all results.
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/// </summary>
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public static class IconManager
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{
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private static ImageSource SmallDirIcon;
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private static ImageSource LargeDirIcon;
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private static readonly Dictionary<string, ImageSource> SmallIconCache = [];
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private static readonly Dictionary<string, ImageSource> LargeIconCache = [];
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public static void ClearCache()
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{
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SmallDirIcon = LargeDirIcon = null;
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SmallIconCache.Clear();
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LargeIconCache.Clear();
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}
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/// <summary>
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/// Get the icon of a directory
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/// </summary>
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/// <param name="large">16x16 or 32x32 icon</param>
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/// <returns>an icon</returns>
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public static ImageSource FindIconForDir(bool large)
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{
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var icon = large ? LargeDirIcon : SmallDirIcon;
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if (icon != null)
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return icon;
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icon = IconReader.GetFolderIcon(large ? IconReader.IconSize.Large : IconReader.IconSize.Small,
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false)
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.ToImageSource();
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if (large)
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LargeDirIcon = icon;
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else
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SmallDirIcon = icon;
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return icon;
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}
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/// <summary>
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/// Get an icon for a given filename
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/// </summary>
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/// <param name="fileName">any filename</param>
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/// <param name="large">16x16 or 32x32 icon</param>
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/// <returns>null if path is null, otherwise - an icon</returns>
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public static ImageSource FindIconForFilename(string fileName, bool large)
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{
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var extension = Path.GetExtension(fileName);
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if (extension == null)
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return null;
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var cache = large ? LargeIconCache : SmallIconCache;
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if (cache.TryGetValue(extension, out ImageSource icon))
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return icon;
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icon = IconReader.GetFileIcon(fileName, large ? IconReader.IconSize.Large : IconReader.IconSize.Small,
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false)
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.ToImageSource();
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cache.Add(extension, icon);
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return icon;
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}
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/// <summary>
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/// http://stackoverflow.com/a/6580799/1943849
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/// </summary>
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private static ImageSource ToImageSource(this Icon icon)
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{
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var imageSource = Imaging.CreateBitmapSourceFromHIcon(
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icon.Handle,
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Int32Rect.Empty,
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BitmapSizeOptions.FromEmptyOptions());
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return imageSource;
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}
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/// <summary>
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/// Provides static methods to read system icons for both folders and files.
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/// </summary>
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/// <example>
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/// <code>IconReader.GetFileIcon("c:\\general.xls");</code>
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/// </example>
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private static class IconReader
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{
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/// <summary>
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/// Options to specify the size of icons to return.
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/// </summary>
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public enum IconSize
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{
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/// <summary>
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/// Specify large icon - 32 pixels by 32 pixels.
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/// </summary>
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Large = 0,
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/// <summary>
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/// Specify small icon - 16 pixels by 16 pixels.
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/// </summary>
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Small = 1
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}
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/// <summary>
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/// Returns the icon of a folder.
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/// </summary>
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/// <param name="size">Large or small</param>
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/// <param name="linkOverlay">Whether to include the link icon</param>
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/// <returns>System.Drawing.Icon</returns>
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public static Icon GetFolderIcon(IconSize size, bool linkOverlay)
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{
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var shfi = new Shell32.Shfileinfo();
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var flags = Shell32.ShgfiIcon | Shell32.ShgfiUsefileattributes;
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if (linkOverlay) flags += Shell32.ShgfiLinkoverlay;
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/* Check the size specified for return. */
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if (IconSize.Small == size)
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flags += Shell32.ShgfiSmallicon;
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else
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flags += Shell32.ShgfiLargeicon;
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Shell32.SHGetFileInfo("placeholder",
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Shell32.FileAttributeDirectory,
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ref shfi,
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(uint)Marshal.SizeOf(shfi),
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flags);
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// Copy (clone) the returned icon to a new object, thus allowing us to clean-up properly
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var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
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User32.DestroyIcon(shfi.hIcon); // Cleanup
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return icon;
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}
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/// <summary>
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/// Returns an icon for a given file - indicated by the name parameter.
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/// </summary>
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/// <param name="name">Pathname for file.</param>
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/// <param name="size">Large or small</param>
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/// <param name="linkOverlay">Whether to include the link icon</param>
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/// <returns>System.Drawing.Icon</returns>
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public static Icon GetFileIcon(string name, IconSize size, bool linkOverlay)
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{
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var shfi = new Shell32.Shfileinfo();
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var flags = Shell32.ShgfiIcon | Shell32.ShgfiUsefileattributes;
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if (linkOverlay) flags += Shell32.ShgfiLinkoverlay;
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/* Check the size specified for return. */
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if (IconSize.Small == size)
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flags += Shell32.ShgfiSmallicon;
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else
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flags += Shell32.ShgfiLargeicon;
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Shell32.SHGetFileInfo(name,
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Shell32.FileAttributeNormal,
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ref shfi,
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(uint)Marshal.SizeOf(shfi),
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flags);
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// Copy (clone) the returned icon to a new object, thus allowing us to clean-up properly
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var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
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User32.DestroyIcon(shfi.hIcon); // Cleanup
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return icon;
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}
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}
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/// <summary>
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/// Wraps necessary Shell32.dll structures and functions required to retrieve Icon Handles using SHGetFileInfo. Code
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/// courtesy of MSDN Cold Rooster Consulting case study.
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/// </summary>
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private static class Shell32
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{
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private const int MaxPath = 256;
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public const uint ShgfiIcon = 0x000000100; // get icon
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public const uint ShgfiLinkoverlay = 0x000008000; // put a link overlay on icon
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public const uint ShgfiLargeicon = 0x000000000; // get large icon
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public const uint ShgfiSmallicon = 0x000000001; // get small icon
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public const uint ShgfiUsefileattributes = 0x000000010; // use passed dwFileAttribute
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public const uint FileAttributeNormal = 0x00000080;
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public const uint FileAttributeDirectory = 0x00000010;
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[DllImport("Shell32.dll")]
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public static extern nint SHGetFileInfo(
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string pszPath,
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uint dwFileAttributes,
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ref Shfileinfo psfi,
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uint cbFileInfo,
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uint uFlags
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);
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[StructLayout(LayoutKind.Sequential)]
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public struct Shfileinfo
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{
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private const int Namesize = 80;
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public readonly nint hIcon;
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private readonly int iIcon;
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private readonly uint dwAttributes;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = MaxPath)]
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private readonly string szDisplayName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = Namesize)]
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private readonly string szTypeName;
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}
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}
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/// <summary>
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/// Wraps necessary functions imported from User32.dll. Code courtesy of MSDN Cold Rooster Consulting example.
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/// </summary>
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private static class User32
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{
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/// <summary>
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/// Provides access to function required to delete handle. This method is used internally
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/// and is not required to be called separately.
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/// </summary>
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/// <param name="hIcon">Pointer to icon handle.</param>
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/// <returns>N/A</returns>
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[DllImport("User32.dll")]
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public static extern int DestroyIcon(nint hIcon);
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}
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}
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