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Focus Management and mouse wheel hooking on WinForms by using WPF

Someone asked very interesting question in MSDN forums. I was sure, that that’s kind of “I forgot something small”, however, I built small repro.


public partial class Window1 : System.Windows.Window
{

public Window1()
{
InitializeComponent();
UserControl1 uc = new UserControl1();
WindowsFormsHost wfh = new WindowsFormsHost();
wfh.Child = (System.Windows.Forms.Control)uc;


((
Grid)this.Content).Children.Add(wfh);

}


public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}

const int WM_MOUSEWHEEL = 0x20A;
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_MOUSEWHEEL)
label1.Text = (
int)m.WParam > 0 ? “Scrolling up” : “Scrolling down”;
}

 

 

 

However, I noticed, that hosted WinForms control receives mouse notification only after it was clicked. What’s the ****, I thought. It was not reasonable for me, so I hooked into WindowsFormsHost.Loaded and UserControl.Load event to set focus manually by code. 



....uc.Load +=
new EventHandler(uc_Load);
....
wfh.Loaded += new RoutedEventHandler(wfh_Loaded);

void wfh_Loaded(object sender, RoutedEventArgs e)
{
FocusManager.SetFocusedElement((DependencyObject)sender, (IInputElement)sender);
}

void uc_Load(object sender, EventArgs e)
{
((
UserControl1)sender).Focus();

}
 

No effect. The user control inside WindowsFormsHost got not focus. Digging deeper, I found interesting article about focus management in WPF Interop application. So, using System.Windows.Interop.IKeyboardInputSink.TabInto(System.Windows.Input.TraversalRequest)  solves the problem. Just one line of code and Interop control, hosted in WPF got the focus, that it requests.

((System.Windows.Interop.IKeyboardInputSink)sender).TabInto(new System.Windows.Input.TraversalRequest(FocusNavigationDirection.First));

Well, next time, I advice to MSDN doc team, to write small bullet and link to such simple solution, that has to occur (as for me) automatically, when I set focus to WindowsFormsHost WPF element.

Z-Order hack for WinForms interop controls in WPF

If you ever tried to put something from WPF world over Windows Forms controls (interop), you, probably, found it impossible. After it, while searching internet, you found AirSpace article, that clearly describes the reasons and rules. Digging more will bring you to the blog of Jeremiah Morrill, who fighting with AirSpace issue about a year. But this can not help you (and especially to your angry client). From one hand, it’s too hard to tell your client: "Sorry, we do now support it". From the other hand, you do not want to mess with complicated 3rd party controls with fair performance. What to do? Scrap it with GDI+. Here the example of scrapping WebBrowser control with it’s internal function DrawToBitmap(). We can incorporate it into BitmapSource solution and have nice graphics instead of static control, when you need it. Just collapse WindowsFormsHost and Show Image control with graphical representation of  your Win32 control

 
  
BitmapSource GetScreen()
{
Bitmap bm = new Bitmap(wb.ClientRectangle.Width, wb.ClientRectangle.Height);
wb.DrawToBitmap(bm, wb.Bounds);
BitmapSource src = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(bm.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
System.Windows.Media.Imaging.
BitmapSizeOptions.FromEmptyOptions());
src.Freeze();
bm.Dispose();
bm =
null;
return src;

}

Wait a second… Why it takes a while to capture the browser screen? Let’s see what Control.DrawToBitmap() method doing.

 
  
public void DrawToBitmap(Bitmap bitmap, Rectangle targetBounds)
{

int width = Math.Min(this.Width, targetBounds.Width);
int height = Math.Min(this.Height, targetBounds.Height);
Bitmap image = new Bitmap(width, height, bitmap.PixelFormat);
using (Graphics graphics = Graphics.FromImage(image))
{
IntPtr hdc = graphics.GetHdc();
using (Graphics graphics2 = Graphics.FromImage(bitmap))
{
IntPtr handle = graphics2.GetHdc();
BitBlt(
new HandleRef(graphics2, handle), targetBounds.X, targetBounds.Y, width, height, new HandleRef(graphics, hdc), 0, 0, 0xcc0020);
graphics2.ReleaseHdcInternal(handle);
}
graphics.ReleaseHdcInternal(hdc);
}
}

 

Well, why to repaint graphics with BitBlit? Really, I can not see any reason of it. Let’s just copy handler

 
  
BitmapSource GetScreenInt()
{
Bitmap bm = new Bitmap(wb.ClientRectangle.Width, wb.ClientRectangle.Height);
Graphics g = Graphics.FromImage(bm);
PrintWindow(wb.Handle, g.GetHdc(), 0);
g.ReleaseHdc();
g.Flush();

BitmapSource src = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(bm.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
System.Windows.Media.Imaging.
BitmapSizeOptions.FromEmptyOptions());
src.Freeze();
bm.Dispose();
bm =
null;
return src;

}

 

Now, the operation takes less, then 0.3 seconds. Pretty good, isn’t it? The only thing, you’ll need is unmanaged signature of PrintWindow. Here is comes

 
  
[DllImport("user32.dll", SetLastError=true)]
static extern bool PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);

 

Have a nice day

Transparent WPF control over unmanaged window handle

All those, how even once tried to put opaque or transparent WPF control over Windows Forms control or, even unmanaged window found themselves within “Airspace problem“. So, what to do? How can we use transparent WPF UI over our legacy windows? This how.

See the image above. As you can see, there is tarsparent XAML page (corners, plus and text) over legacy game window. How to do it? We’ll put our transparent WPF window over Windows Forms window. First of all, we have to find the handle of our WPF application. We have only one for whole application, so let’s get it

 

protected override void OnSourceInitialized(EventArgs e)
        {
            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
 
            if (hwndSource != null)
            {
                handle = hwndSource.Handle;
                WindowFinder.Start(title, handle);
                WindowFinder.OnWindowFound += new WindowFinder.OnWindowFoundHandler(WindowFinder_OnWindowFound);                
            }
        }

So far, so good. Now we have to find the handle of our legacy window. In order to do it, we have to put ourselves into user32.dll and dig FindWindow method from there.

 

[DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

Now let’s enter endless loop for finding our handle

 

IntPtr hWnd = FindWindow(null, (string)e.Argument);
            while (!w.CancellationPending && hWnd == m_ptr)
            {
                System.Threading.Thread.Sleep(100);
                hWnd = FindWindow(null, (string)e.Argument);
            }

Once got it by name, we have to measure it and then resize our WPF window to fit the new size and position. To do it, we’ll use another method GetWindowRect

 

[DllImport("user32.dll")]
        static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
 
RECT r = new RECT();
            while (!w.CancellationPending && ((r.Left == r.Right) & (r.Bottom == r.Top)))
            {
                System.Threading.Thread.Sleep(100);
                GetWindowRect(m_ptr, out r);
            }
 
 
            m_rect = new Rect(r.Left,r.Top,r.Right-r.Left,r.Bottom-r.Top);

Got it and it’s different then 0. Now let’s resize the WPF window and put it over the legacy one and run from the beginning to track any change. Sure, the better way is to build global hook to legacy window messages and adjust properties of our WPF window. Do it. I do not really need it.

 

void WindowFinder_OnWindowFound(IntPtr handle, Rect position)
        {
            this.Left = position.Left;
            this.Top = position.Top;
            this.Width = position.Width;
            this.Height = position.Height;
            WindowFinder.Start(title, handle);
        }

We finished. Now we’ll always have WPF window over legacy window, or control, or anything, that have name or handle. Even Windows Media Player window

A couple of things in the code attached not covered by article:

  • Half and MultipleNumber converters – those converters will help up to bind corners of WPF window into black Polylines, that you can see in the image. Those are really simple
    class HalfNumberConverter:IValueConverter
        {
            #region IValueConverter Members
     
            public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                double half = 0;
                if (double.TryParse(value.ToString(), out half))
                    half /= 2;
                double offset = 0;
                if(double.TryParse(parameter.ToString(), out offset))
                    half += offset;
     
                return half;
            }
    class MultipleNumberConverter:IValueConverter
        {
            #region IValueConverter Members
     
            public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
            {
                double val = 0;
                if (double.TryParse(value.ToString(), out val))
                {
                    char op = parameter.ToString()[0];
                    if (op == '*')
                        val *= double.Parse(parameter.ToString().Remove(0, 1));
                    else if (op == '/')
                        val /= double.Parse(parameter.ToString().Remove(0, 1));
                    if (op == '+')
                        val += double.Parse(parameter.ToString().Remove(0, 1));
                    else if (op == '-')
                        val -= double.Parse(parameter.ToString().Remove(0, 1));
                    else
                        val += double.Parse(parameter.ToString());
                }
                return val;
            }

     
  • StrokeTextBlock – this is hi-contrast textblock, that visible on any background. I wrote about how to build it earlier. Very useful control and any, especially this application
  • In case that you do not know – in order to move borderless transparent window you have to overwrite any OnMouse…. event and DragMove() the control there. The example of usage is OnMouseLeftButtonDown one.
    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
            {
                base.OnMouseLeftButtonDown(e);
                DragMove();
     
            }
  • Do you remember, that there is no hittest within transparent window, so you can use underlying window through our WPF form
  • To do you work, use BackgroundWorker – this save you actions related to thread context stuff.

I think, that most of things were covered by this, so see the source in attachment and when using it, don’t forget to remember me.

Source code for this article

Crossbow supported scenarios

Very useful MSDN article about support and unsupported scenarios in WPF and Windows Forms Interop (Crossbow)

⟨  ⟩

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