WPF - scroll without focus

Question

I want to scroll the ScrollViewer control until the application window is focused. I found some solutions in Windows Forms, but not in WPF, because some of the things I need are not available.

Maybe someone can help me solve my problem?

Thanks in advance.

EDIT:

I want to scroll the ScrollViewer control with the mouse wheel when the mouse is above the ScrollViewer, but also when the application window is out of focus.

Answer 1

I have found a solution. Here is an example:

Xaml

<Window x:Class="Project.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="500"> <ScrollViewer x:Name="ScrollViewer"> <StackPanel> <Border Background="Blue" Width="100" Height="100" /> <Border Background="Red" Width="100" Height="100" /> <Border Background="Blue" Width="100" Height="100" /> <Border Background="Red" Width="100" Height="100" /> <Border Background="Blue" Width="100" Height="100" /> <Border Background="Red" Width="100" Height="100" /> </StackPanel> </ScrollViewer> </Window> 

Code for

 using System; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Input; using System.Windows.Interop; namespace Project { public partial class MainWindow : Window { private const int WH_MOUSE_LL = 14; private const int WM_MOUSEWHEEL = 0x020A; private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam); private IntPtr _handle; public MainWindow() { InitializeComponent(); _handle = new WindowInteropHelper(this).Handle; SetWindowsHookEx(WH_MOUSE_LL, MouseChanged, _handle, 0); ScrollViewer.PreviewMouseWheel += ScrollViewer_MouseWheel; Unloaded += MainWindow_Unloaded; } private void MainWindow_Unloaded(object sender, RoutedEventArgs e) { UnhookWindowsHookEx(_handle); } private void ScrollViewer_MouseWheel(object sender, MouseWheelEventArgs e) { e.Handled = true; } private IntPtr MouseChanged(int nCode, IntPtr wParam, IntPtr lParam) { if (ScrollViewer.IsMouseOver && WM_MOUSEWHEEL == (int)wParam) { MouseData mouseData = (MouseData)Marshal.PtrToStructure(lParam, typeof(MouseData)); ScrollViewer.ScrollToVerticalOffset(ScrollViewer.VerticalOffset - mouseData.Z / 200000.0); } return CallNextHookEx(_handle, nCode, wParam, lParam); } [StructLayout(LayoutKind.Sequential)] private struct MouseData { public int X; public int Y; public int Z; } [DllImport("user32.dll")] private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc lpfn, IntPtr hMod, uint dwThreadId); [DllImport("user32.dll")] private static extern bool UnhookWindowsHookEx(IntPtr hhk); [DllImport("user32.dll")] private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam); } }