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// 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 Tango.Scripting.Editors.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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