235 lines
12 KiB
C#
235 lines
12 KiB
C#
using System.Runtime.InteropServices;
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using System.Text;
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namespace DeskCore;
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/// <summary>Ein Icon auf dem echten Windows-Desktop (Bildschirm-Pixel).</summary>
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public record DesktopIcon(string Path, int X, int Y, int IconSize, int CellWidth);
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/// <summary>
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/// Liest Positionen und Größe der echten Desktop-Icons über die offizielle Shell-Schnittstelle (IFolderView)
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/// aus – ohne etwas in den Explorer einzuschleusen. Nur auf dem UI-Thread (STA) aufrufen.
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/// </summary>
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public static class DesktopIcons
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{
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/// <summary>Alle Desktop-Icons mit Position – oder leer, wenn der Desktop gerade nicht erreichbar ist.</summary>
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public static List<DesktopIcon> Read()
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{
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var result = new List<DesktopIcon>();
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try
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{
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var view = DesktopFolderView(out var listView);
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if (view is null || listView == IntPtr.Zero) return result;
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var view2 = view as IFolderView2;
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int iconSize = 48;
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if (view2 is not null && view2.GetViewModeAndIconSize(out _, out var size) == 0) iconSize = size;
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view.GetSpacing(out var spacing);
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var origin = new POINT();
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ClientToScreen(listView, ref origin);
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view.ItemCount(SVGIO_ALLVIEW, out int count);
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for (int i = 0; i < count; i++)
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{
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if (view.Item(i, out var pidl) != 0 || pidl == IntPtr.Zero) continue;
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try
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{
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if (view.GetItemPosition(pidl, out var pos) != 0) continue;
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string path = "";
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if (view2 is not null && view2.GetItem(i, typeof(IShellItem).GUID, out var obj) == 0 && obj is IShellItem item)
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{
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if (item.GetDisplayName(SIGDN_FILESYSPATH, out var p) == 0)
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{
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path = Marshal.PtrToStringUni(p) ?? "";
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Marshal.FreeCoTaskMem(p);
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}
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Marshal.ReleaseComObject(item);
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}
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result.Add(new DesktopIcon(path, origin.X + pos.X, origin.Y + pos.Y, iconSize, spacing.X));
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}
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finally { Marshal.FreeCoTaskMem(pidl); }
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}
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}
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catch { }
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return result;
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}
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/// <summary>
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/// Rechteck des Icon-Bildes in Bildschirm-Pixeln. Die Position aus IFolderView ist bereits die linke obere
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/// Ecke des Bildes (gemessen: Eintrag beginnt (Abstand − Bildgröße) / 2 weiter links, 3 px weiter oben).
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/// </summary>
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public static (int L, int T, int Size) IconRect(DesktopIcon i) => (i.X, i.Y + IconTopOffset, i.IconSize);
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/// <summary>Feinkorrektur nach unten (Windows zeichnet das Bild mit kleinem Rand).</summary>
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public static int IconTopOffset { get; set; } = 3;
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/// <summary>Gesamte Fläche eines Eintrags (Bild + Beschriftung), z. B. für Klick-Tests.</summary>
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public static (int L, int T, int W, int H) CellRect(DesktopIcon i)
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{
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int pad = Math.Max(0, (i.CellWidth - i.IconSize) / 2);
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return (i.X - pad, i.Y, i.CellWidth, i.IconSize + 44);
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}
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/// <summary>Zuletzt gelesene Icons (für schnelle Prüfungen aus dem Maus-Hook, ohne COM-Aufruf).</summary>
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public static volatile IReadOnlyList<DesktopIcon> Cached = [];
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/// <summary>Zwischenspeicher auffrischen (UI-Thread). Gibt true zurück, wenn sich etwas geändert hat.</summary>
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public static bool RefreshCache()
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{
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var fresh = Read();
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bool changed = fresh.Count != Cached.Count || fresh.Where((x, n) => x != Cached[n]).Any();
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Cached = fresh;
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return changed;
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}
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/// <param name="margin">Zusätzlicher Rand in Pixeln, damit Klicks knapp neben Bild oder Beschriftung auch zählen.</param>
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public static bool HitsIcon(int x, int y, int margin = 0) => Cached.Any(i =>
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{
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var (l, t, w, h) = CellRect(i);
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return x >= l - margin && x < l + w + margin && y >= t - margin && y < t + h + margin;
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});
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// ---------- Desktop-Ansicht finden ----------
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private static IFolderView? DesktopFolderView(out IntPtr listView)
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{
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listView = IntPtr.Zero;
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var shellWindows = (IShellWindows)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_ShellWindows)!)!;
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try
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{
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object loc = CSIDL_DESKTOP, empty = new object();
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var disp = shellWindows.FindWindowSW(ref loc, ref empty, SWC_DESKTOP, out _, SWFO_NEEDDISPATCH);
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if (disp is not IServiceProvider sp) return null;
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var sidBrowser = SID_STopLevelBrowser;
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var iidBrowser = typeof(IShellBrowser).GUID;
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if (sp.QueryService(ref sidBrowser, ref iidBrowser, out var browserObj) != 0) return null;
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var browser = (IShellBrowser)browserObj;
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if (browser.QueryActiveShellView(out var shellView) != 0 || shellView is null) return null;
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shellView.GetWindow(out var defView);
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listView = FindWindowEx(defView, IntPtr.Zero, "SysListView32", null);
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return shellView as IFolderView;
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}
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finally { Marshal.ReleaseComObject(shellWindows); }
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}
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// ---------- COM-Schnittstellen (nur die benötigten Methoden in vtable-Reihenfolge) ----------
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private const int CSIDL_DESKTOP = 0, SWC_DESKTOP = 8, SWFO_NEEDDISPATCH = 1, SVGIO_ALLVIEW = 2;
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private const uint SIGDN_FILESYSPATH = 0x80058000;
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private static readonly Guid CLSID_ShellWindows = new("9BA05972-F6A8-11CF-A442-00A0C90A8F39");
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private static readonly Guid SID_STopLevelBrowser = new("4C96BE40-915C-11CF-99D3-00AA004AE837");
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[StructLayout(LayoutKind.Sequential)] private struct POINT { public int X, Y; }
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[ComImport, Guid("85CB6900-4D95-11CF-960C-0080C7F4EE85"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
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private interface IShellWindows
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{
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int Count { get; }
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[return: MarshalAs(UnmanagedType.IDispatch)] object Item(object index);
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[return: MarshalAs(UnmanagedType.IUnknown)] object _NewEnum();
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void Register([MarshalAs(UnmanagedType.IDispatch)] object pid, int hwnd, int swClass, out int plCookie);
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void RegisterPending(int lThreadId, ref object pvarloc, ref object pvarlocRoot, int swClass, out int plCookie);
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void Revoke(int lCookie);
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void OnNavigate(int lCookie, ref object pvarLoc);
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void OnActivated(int lCookie, short fActive);
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[return: MarshalAs(UnmanagedType.IDispatch)]
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object FindWindowSW(ref object pvarLoc, ref object pvarLocRoot, int swClass, out int pHWND, int swfwOptions);
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}
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[ComImport, Guid("6D5140C1-7436-11CE-8034-00AA006009FA"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IServiceProvider
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{
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[PreserveSig] int QueryService(ref Guid guidService, ref Guid riid, [MarshalAs(UnmanagedType.Interface)] out object ppvObject);
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}
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[ComImport, Guid("000214E2-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IShellBrowser
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{
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void GetWindow(out IntPtr phwnd);
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void ContextSensitiveHelp(bool fEnterMode);
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void InsertMenusSB(IntPtr hmenuShared, IntPtr lpMenuWidths);
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void SetMenuSB(IntPtr hmenuShared, IntPtr holemenuRes, IntPtr hwndActiveObject);
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void RemoveMenusSB(IntPtr hmenuShared);
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void SetStatusTextSB(IntPtr pszStatusText);
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void EnableModelessSB(bool fEnable);
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void TranslateAcceleratorSB(IntPtr pmsg, ushort wID);
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void BrowseObject(IntPtr pidl, uint wFlags);
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void GetViewStateStream(uint grfMode, out IntPtr ppStrm);
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void GetControlWindow(uint id, out IntPtr phwnd);
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void SendControlMsg(uint id, uint uMsg, IntPtr wParam, IntPtr lParam, out IntPtr pret);
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[PreserveSig] int QueryActiveShellView(out IShellView ppshv);
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}
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[ComImport, Guid("000214E3-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IShellView
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{
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void GetWindow(out IntPtr phwnd);
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}
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[ComImport, Guid("CDE725B0-CCC9-4519-917E-325D72FAB4CE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IFolderView
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{
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[PreserveSig] int GetCurrentViewMode(out uint pViewMode);
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[PreserveSig] int SetCurrentViewMode(uint ViewMode);
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[PreserveSig] int GetFolder(ref Guid riid, out IntPtr ppv);
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[PreserveSig] int Item(int iItemIndex, out IntPtr ppidl);
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[PreserveSig] int ItemCount(uint uFlags, out int pcItems);
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[PreserveSig] int Items(uint uFlags, ref Guid riid, out IntPtr ppv);
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[PreserveSig] int GetSelectionMarkedItem(out int piItem);
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[PreserveSig] int GetFocusedItem(out int piItem);
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[PreserveSig] int GetItemPosition(IntPtr pidl, out POINT ppt);
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[PreserveSig] int GetSpacing(out POINT ppt);
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}
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[ComImport, Guid("1AF3A467-214F-4298-908E-06B03E0B39F9"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IFolderView2
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{
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// IFolderView
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[PreserveSig] int GetCurrentViewMode(out uint pViewMode);
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[PreserveSig] int SetCurrentViewMode(uint ViewMode);
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[PreserveSig] int GetFolder(ref Guid riid, out IntPtr ppv);
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[PreserveSig] int Item(int iItemIndex, out IntPtr ppidl);
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[PreserveSig] int ItemCount(uint uFlags, out int pcItems);
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[PreserveSig] int Items(uint uFlags, ref Guid riid, out IntPtr ppv);
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[PreserveSig] int GetSelectionMarkedItem(out int piItem);
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[PreserveSig] int GetFocusedItem(out int piItem);
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[PreserveSig] int GetItemPosition(IntPtr pidl, out POINT ppt);
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[PreserveSig] int GetSpacing(out POINT ppt);
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[PreserveSig] int GetDefaultSpacing(out POINT ppt);
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[PreserveSig] int GetAutoArrange();
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[PreserveSig] int SelectItem(int iItem, uint dwFlags);
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[PreserveSig] int SelectAndPositionItems(uint cidl, IntPtr apidl, IntPtr apt, uint dwFlags);
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// IFolderView2
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[PreserveSig] int SetGroupBy(IntPtr key, bool fAscending);
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[PreserveSig] int GetGroupBy(IntPtr pkey, out bool pfAscending);
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[PreserveSig] int SetViewProperty(IntPtr pidl, IntPtr propkey, IntPtr propvar);
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[PreserveSig] int GetViewProperty(IntPtr pidl, IntPtr propkey, IntPtr ppropvar);
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[PreserveSig] int SetTileViewProperties(IntPtr pidl, IntPtr pszPropList);
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[PreserveSig] int SetExtendedTileViewProperties(IntPtr pidl, IntPtr pszPropList);
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[PreserveSig] int SetText(int iType, IntPtr pwszText);
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[PreserveSig] int SetCurrentFolderFlags(uint dwMask, uint dwFlags);
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[PreserveSig] int GetCurrentFolderFlags(out uint pdwFlags);
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[PreserveSig] int GetSortColumnCount(out int pcColumns);
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[PreserveSig] int SetSortColumns(IntPtr rgSortColumns, int cColumns);
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[PreserveSig] int GetSortColumns(IntPtr rgSortColumns, int cColumns);
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[PreserveSig] int GetItem(int iItem, [MarshalAs(UnmanagedType.LPStruct)] Guid riid, [MarshalAs(UnmanagedType.Interface)] out object ppv);
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[PreserveSig] int GetVisibleItem(int iStart, bool fPrevious, out int piItem);
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[PreserveSig] int GetSelectedItem(int iStart, out int piItem);
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[PreserveSig] int GetSelection(bool fNoneImpliesFolder, out IntPtr ppsia);
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[PreserveSig] int GetSelectionState(IntPtr pidl, out uint pdwFlags);
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[PreserveSig] int InvokeVerbOnSelection(IntPtr pszVerb);
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[PreserveSig] int SetViewModeAndIconSize(int uViewMode, int iImageSize);
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[PreserveSig] int GetViewModeAndIconSize(out int puViewMode, out int piImageSize);
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}
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[ComImport, Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IShellItem
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{
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[PreserveSig] int BindToHandler(IntPtr pbc, ref Guid bhid, ref Guid riid, out IntPtr ppv);
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[PreserveSig] int GetParent(out IShellItem ppsi);
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[PreserveSig] int GetDisplayName(uint sigdnName, out IntPtr ppszName);
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}
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[DllImport("user32.dll")] private static extern bool ClientToScreen(IntPtr hWnd, ref POINT lpPoint);
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[DllImport("user32.dll", CharSet = CharSet.Unicode)] private static extern IntPtr FindWindowEx(IntPtr parent, IntPtr after, string? cls, string? title);
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}
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