mirror of https://github.com/dahall/Vanara.git
262 lines
11 KiB
C#
262 lines
11 KiB
C#
#nullable enable
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using System.Collections.Generic;
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using System.Linq;
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using Vanara.PInvoke;
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using static Vanara.PInvoke.Ole32;
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using static Vanara.PInvoke.Shell32;
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using static Vanara.PInvoke.User32;
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using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject;
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namespace Vanara.Windows.Shell;
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/// <summary>Static class with methods to interact with the Clipboard.</summary>
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/// <example>
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/// <code title="Indirect manipulation">// This model let's you place multiple formats at once on the clipboard
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/// IDataObject ido = NativeClipboard.CreateEmptyDataObject();
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/// ido.SetData(CLIPFORMAT.CF_UNICODETEXT, txt);
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/// ido.SetData(Shell32.ShellClipboardFormat.CF_HTML, htmlFragment);
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/// ido.SetData("MyRectFormat", new RECT(1, 2, 3, 4));
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/// NativeClipboard.SetDataObject(ido);</code></example>
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public static class NativeClipboard
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{
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private const int stdRetryCnt = 5;
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private const int stdRetryDelay = 100;
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private static readonly object objectLock = new();
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private static ListenerWindow? listener;
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[ThreadStatic]
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private static bool oleInit = false;
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/// <summary>Occurs when whenever the contents of the Clipboard have changed.</summary>
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public static event EventHandler ClipboardUpdate
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{
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add
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{
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lock (objectLock)
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{
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listener ??= new ListenerWindow();
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InternalClipboardUpdate += value;
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}
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}
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remove
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{
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lock (objectLock)
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{
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InternalClipboardUpdate -= value;
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if (InternalClipboardUpdate is null || InternalClipboardUpdate.GetInvocationList().Length == 0)
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listener = null;
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}
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}
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}
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private static event EventHandler? InternalClipboardUpdate;
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/// <summary>Gets the <see cref="IComDataObject"/> instance from the Windows Clipboard.</summary>
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/// <value>A <see cref="IComDataObject"/> instance.</value>
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public static IComDataObject CurrentDataObject
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{
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get
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{
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Init();
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int n = stdRetryCnt;
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HRESULT hr = HRESULT.S_OK;
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for (int i = 1; i <= n; i++)
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{
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hr = OleGetClipboard(out var idata);
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if (hr.Succeeded)
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return idata;
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if (i < n)
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System.Threading.Thread.Sleep(stdRetryDelay);
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}
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throw hr.GetException()!;
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}
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}
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/// <summary>Retrieves the currently supported clipboard formats.</summary>
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/// <value>A sequence of the currently supported formats.</value>
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public static IEnumerable<uint> CurrentlySupportedFormats
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{
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get
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{
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GetUpdatedClipboardFormats(null, 0, out var cnt);
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var fmts = new uint[cnt];
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Win32Error.ThrowLastErrorIfFalse(GetUpdatedClipboardFormats(fmts, (uint)fmts.Length, out cnt));
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return fmts.Take((int)cnt).ToArray();
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}
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}
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/// <summary>Retrieves the clipboard sequence number for the current window station.</summary>
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/// <returns>
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/// The clipboard sequence number. If you do not have <c>WINSTA_ACCESSCLIPBOARD</c> access to the window station, the function
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/// returns zero.
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/// </returns>
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/// <remarks>
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/// The system keeps a serial number for the clipboard for each window station. This number is incremented whenever the contents of
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/// the clipboard change or the clipboard is emptied. You can track this value to determine whether the clipboard contents have
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/// changed and optimize creating DataObjects. If clipboard rendering is delayed, the sequence number is not incremented until the
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/// changes are rendered.
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/// </remarks>
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public static uint SequenceNumber => GetClipboardSequenceNumber();
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/// <summary>Clears the clipboard of any data or formatting.</summary>
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public static void Clear() => SetDataObject(null);
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/// <summary>Puts a list of shell items onto the clipboard.</summary>
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/// <param name="shellItems">The sequence of shell items. The PIDL of each shell item must be absolute.</param>
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public static IComDataObject CreateDataObjectFromShellItems(params ShellItem[] shellItems) => shellItems.Length == 0 ? CreateEmptyDataObject() : new ShellItemArray(shellItems).ToDataObject()!;
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/// <summary>Puts a list of shell items onto the clipboard.</summary>
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/// <param name="parent">The parent folder instance.</param>
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/// <param name="relativeShellItems">The sequence of shell items relative to <paramref name="parent"/>.</param>
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public static IComDataObject CreateDataObjectFromShellItems(ShellFolder parent, params ShellItem[] relativeShellItems)
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{
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if (parent is null) throw new ArgumentNullException(nameof(parent));
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if (relativeShellItems.Length == 0) return CreateEmptyDataObject();
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SHCreateDataObject(parent.PIDL, relativeShellItems.Select(i => i.PIDL), default, out var dataObj).ThrowIfFailed();
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return dataObj;
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}
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/// <summary>Creates an empty, writable data object.</summary>
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/// <value>The data object.</value>
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public static IComDataObject CreateEmptyDataObject()
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{
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SHCreateDataObject(ppv: out var writableDataObj).ThrowIfFailed();
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return writableDataObj;
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}
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/// <summary>Carries out the clipboard shutdown sequence. It also releases any IDataObject instances that were placed on the clipboard.</summary>
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public static void Flush() { Init(); TryMultThenThrowIfFailed(OleFlushClipboard); }
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/// <summary>Retrieves the window handle of the current owner of the clipboard.</summary>
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/// <returns>
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/// <para>If the function succeeds, the return value is the handle to the window that owns the clipboard.</para>
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/// <para>If the clipboard is not owned, the return value is <c>IntPtr.Zero</c>.</para>
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/// </returns>
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/// <remarks>
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/// <para>The clipboard can still contain data even if the clipboard is not currently owned.</para>
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/// <para>In general, the clipboard owner is the window that last placed data in clipboard.</para>
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/// </remarks>
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public static HWND GetClipboardOwner() => User32.GetClipboardOwner();
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/// <summary>Retrieves the first available clipboard format in the specified list.</summary>
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/// <param name="idList">The clipboard formats, in priority order.</param>
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/// <returns>
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/// If the function succeeds, the return value is the first clipboard format in the list for which data is available. If the
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/// clipboard is empty, the return value is 0. If the clipboard contains data, but not in any of the specified formats, the return
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/// value is –1.
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/// </returns>
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public static int GetFirstFormatAvailable(params uint[] idList) => GetPriorityClipboardFormat(idList, idList.Length);
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/// <summary>Retrieves from the clipboard the name of the specified registered format.</summary>
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/// <param name="formatId">The type of format to be retrieved.</param>
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/// <returns>The format name.</returns>
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public static string GetFormatName(uint formatId) => ShellClipboardFormat.GetName(formatId);
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/// <summary>Retrieves the handle to the window that currently has the clipboard open.</summary>
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/// <returns>
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/// If the function succeeds, the return value is the handle to the window that has the clipboard open. If no window has the
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/// clipboard open, the return value is <c>IntPtr.Zero</c>.
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/// </returns>
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/// <remarks>
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/// If an application or DLL specifies a <c>NULL</c> window handle when calling the OpenClipboard function, the clipboard is opened
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/// but is not associated with a window. In such a case, <c>GetOpenClipboardWindow</c> returns <c>IntPtr.Zero</c>.
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/// </remarks>
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public static HWND GetOpenClipboardWindow() => User32.GetOpenClipboardWindow();
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/// <summary>Determines whether the data object pointer previously placed on the clipboard is still on the clipboard.</summary>
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/// <param name="dataObject">
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/// The IDataObject interface on the data object containing clipboard data of interest, which the caller previously placed on the clipboard.
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/// </param>
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/// <returns><see langword="true"/> on success; otherwise, <see langword="false"/>.</returns>
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public static bool IsCurrentDataObject(IComDataObject dataObject) => OleIsCurrentClipboard(dataObject) == HRESULT.S_OK;
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/// <summary>Determines whether the clipboard contains data in the specified format.</summary>
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/// <param name="id">A standard or registered clipboard format.</param>
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/// <returns>If the clipboard format is available, the return value is <see langword="true"/>; otherwise <see langword="false"/>.</returns>
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public static bool IsFormatAvailable(uint id) => IsClipboardFormatAvailable(id);
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/// <summary>Determines whether the clipboard contains data in the specified format.</summary>
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/// <param name="id">A clipboard format string.</param>
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/// <returns>If the clipboard format is available, the return value is <see langword="true"/>; otherwise <see langword="false"/>.</returns>
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public static bool IsFormatAvailable(string id) => IsClipboardFormatAvailable(RegisterFormat(id));
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// EnumAvailableFormats().Contains(id);
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/// <summary>Registers a new clipboard format. This format can then be used as a valid clipboard format.</summary>
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/// <param name="format">The name of the new format.</param>
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/// <returns>The registered clipboard format identifier.</returns>
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/// <exception cref="ArgumentNullException">format</exception>
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/// <remarks>
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/// If a registered format with the specified name already exists, a new format is not registered and the return value identifies the
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/// existing format. This enables more than one application to copy and paste data using the same registered clipboard format. Note
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/// that the format name comparison is case-insensitive.
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/// </remarks>
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public static uint RegisterFormat(string format) => ShellClipboardFormat.Register(format);
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/// <summary>
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/// Places a specific data object onto the clipboard. This makes the data object accessible to the OleGetClipboard function.
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/// </summary>
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/// <param name="dataObj">
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/// The IDataObject interface on the data object from which the data to be placed on the clipboard can be obtained.
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/// </param>
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public static void SetDataObject(IComDataObject? dataObj)
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{
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Init();
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TryMultThenThrowIfFailed(OleSetClipboard, dataObj);
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if (dataObj is not null)
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Marshal.ReleaseComObject(dataObj);
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Flush();
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}
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private static void Init() { if (!oleInit) { oleInit = CoInitialize().Succeeded; } }
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private static bool TryMultThenThrowIfFailed(Func<HRESULT> func, int n = stdRetryCnt)
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{
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HRESULT hr = HRESULT.S_OK;
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for (int i = 1; i <= n; i++)
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{
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hr = func();
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if (hr.Succeeded)
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return hr == HRESULT.S_OK;
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if (i < n)
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System.Threading.Thread.Sleep(stdRetryDelay);
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}
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throw hr.GetException()!;
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}
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private static bool TryMultThenThrowIfFailed(Func<IComDataObject?, HRESULT> func, IComDataObject? o, int n = stdRetryCnt)
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{
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HRESULT hr = HRESULT.S_OK;
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for (int i = 1; i <= n; i++)
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{
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hr = func(o);
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if (hr.Succeeded)
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return hr == HRESULT.S_OK;
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if (i < n)
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System.Threading.Thread.Sleep(stdRetryDelay);
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}
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throw hr.GetException()!;
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}
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private class ListenerWindow : SystemEventHandler
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{
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protected override bool MessageFilter(HWND hwnd, uint msg, IntPtr wParam, IntPtr lParam, out IntPtr lReturn)
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{
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lReturn = default;
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switch (msg)
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{
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case (uint)WindowMessage.WM_DESTROY:
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RemoveClipboardFormatListener(MessageWindowHandle);
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break;
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case (uint)ClipboardNotificationMessage.WM_CLIPBOARDUPDATE:
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InternalClipboardUpdate?.Invoke(this, EventArgs.Empty);
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break;
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}
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return false;
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}
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protected override void OnMessageWindowHandleCreated()
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{
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base.OnMessageWindowHandleCreated();
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AddClipboardFormatListener(MessageWindowHandle);
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}
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}
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} |