Question

我有一个WPF应用程序（用C＃编写），它有一个Listview控件，当应用程序处于焦点时，它可以用鼠标滚轮完美滚动。但是，当应用程序未对焦时，即使鼠标指针位于应用程序和列表视图区域，Listview不滚动。我继续在应用程序上看到鼠标悬停相关的效果，但没有收到鼠标滚轮事件。这与大多数其他应用程序在我的桌面上的工作方式一致，但其中一些（如Facebook Messenger）支持无焦点滚动，我想在我的WPF应用程序中模仿。

我已经搜索过MSDN论坛和Stackoverflow，并看到了Windows Forms的多个解决方案，但是他们是5年前提出的问题，我想知道是否有人能够在.net 4.5上相对轻松地做到这一点并且可以指出我可能的解决方案

--- ---编辑

由于这个帖子C# ListView mouse wheel scroll without focus

，我能够在某种程度上取得进展

以下是我接收鼠标滚轮功能的方式

private static IntPtr HookCallback(
int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 &&
MouseMessages.WM_MOUSEWHEEL == (MouseMessages)wParam)
        {
            MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
            Console.WriteLine(hookStruct.pt.x + ", " + hookStruct.pt.y);
            Console.WriteLine((short)((hookStruct.mouseData)>>16));                
            MouseWheelEventArgs myArgs = new MouseWheelEventArgs(System.Windows.Input.Mouse.PrimaryDevice, (int)hookStruct.time, (short)((hookStruct.mouseData)>>16));
            myMainFrame.SidePanelControl.ScrollTheListView(myArgs);
            }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }

正如您所看到的，我正在初始化MouseWheelEventArgs实例并拥有时间，delta和鼠标设备属性。

如何将此鼠标滚轮事件传递给我的listview scrollviewer？

Answer 1

管理让这个工作。这是我的课。所有人都需要做的就是

初始化InterceptMouse，将app / listview / etc指针传递给它
当应用程序未处于焦点但发生相应的mouseenter事件时，开始拦截鼠标。
只要事件是mousewheel，listview的scrollviewer就会发送mouseWheel事件。
当应用程序被激活或调用mouseleave时，停止拦截鼠标。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Interop;
using System.Windows.Forms;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Input;
using System.Diagnostics;
using System.Windows.Forms.Integration;
namespace myApp.HelperClasses
{
    public class InterceptMouse
    {
        public static System.Windows.Controls.ListView myListview;
        private static LowLevelMouseProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;


        public InterceptMouse(System.Windows.Controls.ListView myListviewParam)
        {
            myListview = myListviewParam;
        }

        public static void StartIntercepting()
        {
            _hookID = SetHook(_proc);
        }
        public static void StopIntercepting()
        {
            UnhookWindowsHookEx(_hookID);
        }

        private static IntPtr SetHook(LowLevelMouseProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_MOUSE_LL, proc,
                    GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private delegate IntPtr LowLevelMouseProc(int nCode, IntPtr wParam, IntPtr lParam);


        private static IntPtr HookCallback(
            int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 &&
                MouseMessages.WM_MOUSEWHEEL == (MouseMessages)wParam)
            {
                MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
                //Console.WriteLine(hookStruct.pt.x + ", " + hookStruct.pt.y + "," + hookStruct.mouseData);

                var delta = (short)((hookStruct.mouseData) >> 16);
                var mouse = InputManager.Current.PrimaryMouseDevice;
                var args = new MouseWheelEventArgs(mouse, Environment.TickCount, delta);
                args.RoutedEvent = WindowsFormsHost.MouseWheelEvent;

                Decorator border = VisualTreeHelper.GetChild(myListview, 0) as Decorator;
                // Get scrollviewer
                ScrollViewer scrollViewer = border.Child as ScrollViewer;
                scrollViewer.RaiseEvent(args);
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }



        private const int WH_MOUSE_LL = 14;

        private enum MouseMessages
        {
            WM_LBUTTONDOWN = 0x0201,
            WM_LBUTTONUP = 0x0202,
            WM_MOUSEMOVE = 0x0200,
            WM_MOUSEWHEEL = 0x020A,
            WM_RBUTTONDOWN = 0x0204,
            WM_RBUTTONUP = 0x0205
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct POINT
        {
            public int x;
            public int y;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct MSLLHOOKSTRUCT
        {
            public POINT pt;
            public uint mouseData;
            public uint flags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook,
            LowLevelMouseProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
            IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
    }
}

当应用程序不在焦点上时，WPF Listview不会滚动（使用鼠标滚轮）

1 个答案: