WPF - 滾動沒有焦點

Question

我要滾動ScrollViewer控件，而不是專注於應用程序窗口。我發現在Windows窗體的一些解決方案，但不是在WPF因爲一些我需要的東西都沒有。

也許這裏有人可以幫助我解決我的問題？

在此先感謝。

編輯：

我要滾動鼠標滾輪的ScrollViewer控件，而鼠標在ScrollViewer中，也同時不集中的應用程序窗口。

Answer 1

我找到了解決辦法。下面一個例子：

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> 

代碼隱藏

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); 
    } 
}