// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt) // This code is distributed under the GNU LGPL (for details please see \doc\license.txt) using System; using System.Runtime.InteropServices; using System.Security; using System.Windows; using System.Windows.Interop; using System.Windows.Media; namespace ICSharpCode.AvalonEdit.Utils { /// <summary> /// Wrapper around Win32 functions. /// </summary> static class Win32 { /// <summary> /// Gets the caret blink time. /// </summary> public static TimeSpan CaretBlinkTime { get { return TimeSpan.FromMilliseconds(SafeNativeMethods.GetCaretBlinkTime()); } } /// <summary> /// Creates an invisible Win32 caret for the specified Visual with the specified size (coordinates local to the owner visual). /// </summary> public static bool CreateCaret(Visual owner, Size size) { if (owner == null) throw new ArgumentNullException("owner"); HwndSource source = PresentationSource.FromVisual(owner) as HwndSource; if (source != null) { Vector r = owner.PointToScreen(new Point(size.Width, size.Height)) - owner.PointToScreen(new Point(0, 0)); return SafeNativeMethods.CreateCaret(source.Handle, IntPtr.Zero, (int)Math.Ceiling(r.X), (int)Math.Ceiling(r.Y)); } else { return false; } } /// <summary> /// Sets the position of the caret previously created using <see cref="CreateCaret"/>. position is relative to the owner visual. /// </summary> public static bool SetCaretPosition(Visual owner, Point position) { if (owner == null) throw new ArgumentNullException("owner"); HwndSource source = PresentationSource.FromVisual(owner) as HwndSource; if (source != null) { Point pointOnRootVisual = owner.TransformToAncestor(source.RootVisual).Transform(position); Point pointOnHwnd = pointOnRootVisual.TransformToDevice(source.RootVisual); return SafeNativeMethods.SetCaretPos((int)pointOnHwnd.X, (int)pointOnHwnd.Y); } else { return false; } } /// <summary> /// Destroys the caret previously created using <see cref="CreateCaret"/>. /// </summary> public static bool DestroyCaret() { return SafeNativeMethods.DestroyCaret(); } [SuppressUnmanagedCodeSecurity] static class SafeNativeMethods { [DllImport("user32.dll")] public static extern int GetCaretBlinkTime(); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap, int nWidth, int nHeight); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool SetCaretPos(int x, int y); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool DestroyCaret(); } } }
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