WPF實現(xiàn)監(jiān)聽快捷鍵的方式分享
1.調(diào)用Win32 API
優(yōu)先級最高,全局監(jiān)聽, 支持最小化失焦等情況
那么,假如我要在一個WPF程序監(jiān)聽CTRL+5按鍵,首先在主窗口程序添加以下代碼:
/// <summary> /// CTRL+5事件Id /// </summary> private const int Ctrl5KeyEventId = 9000; [DllImport("user32.dll")] public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk); [DllImport("user32.dll")] public static extern bool UnregisterHotKey(IntPtr hWnd, int id); protected override void OnSourceInitialized(EventArgs e) { base.OnSourceInitialized(e); var handle = new WindowInteropHelper(this).Handle; var source = HwndSource.FromHwnd(handle); source?.AddHook(HwndHook); //真正注冊快捷鍵監(jiān)聽處理: 同時注冊數(shù)字鍵和小鍵盤的CTRL+5 RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.D5)); RegisterHotKey(handle, Ctrl5KeyEventId, (uint)ModifierKeys.Control, (uint)KeyInterop.VirtualKeyFromKey(Key.NumPad5)); } private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { const int wmHotkey = 0x0312; switch (msg) { case wmHotkey: switch (wParam.ToInt32()) { case Ctrl5KeyEventId: Debug.WriteLine("Win32監(jiān)聽CTRL+5成功"); break; } break; } return IntPtr.Zero; } protected override void OnClosing(CancelEventArgs e) { base.OnClosing(e); var handle = new WindowInteropHelper(this).Handle; //關(guān)閉窗口后取消注冊 UnregisterHotKey(handle, Ctrl5KeyEventId); }
2.監(jiān)聽WPF的KeyDown事件
不夠清真,可選擇,最小化失焦等情況監(jiān)聽失效
public MainWindow() { InitializeComponent(); KeyDown += MainWindow_KeyDown; } private void MainWindow_KeyDown(object sender, KeyEventArgs e) { if (Keyboard.Modifiers == ModifierKeys.Control && (e.Key == Key.D5 || e.Key == Key.NumPad5)) { Debug.WriteLine("WPF的KeyDown事件監(jiān)聽CTRL+5成功"); ; e.Handled = true; } }
3.XAML綁定命令方式
WPF當(dāng)然優(yōu)先選中命令綁定啦,清真,最小化失焦等情況監(jiān)聽失效
以下為Window主窗體的XAML代碼
<Window.CommandBindings> <CommandBinding Command="{x:Static local:Commands.Ctrl5Command}" Executed="Ctrl5Command_OnExecuted"/> </Window.CommandBindings> <Window.InputBindings> <KeyBinding Modifiers="Control" Key="D5" Command="{x:Static local:Commands.Ctrl5Command}" /> <KeyBinding Modifiers="Control" Key="NumPad5" Command="{x:Static local:Commands.Ctrl5Command}" /> </Window.InputBindings>
在Window主窗體后臺代碼創(chuàng)建命令對應(yīng)的Executed方法
private void Ctrl5Command_OnExecuted(object sender, ExecutedRoutedEventArgs e) { Debug.WriteLine("WPF的XAML綁定命令監(jiān)聽CTRL+5成功"); }
新增命令相關(guān)的靜態(tài)類:
public static class Commands { public static ICommand Ctrl5Command { get; } = new RoutedCommand(); }
4.細節(jié)
三個監(jiān)聽方案的優(yōu)先級
其中Win32 > XAML綁定命令 = KeyDown事件,假如同時監(jiān)聽的話,其中會只處理高優(yōu)先級的,以上面的例子,假如
我同時監(jiān)聽三個,只會處理win32的
Win32監(jiān)聽CTRL+5成功
全局監(jiān)聽問題
其中win32支持全局監(jiān)聽鍵盤,也就是窗口在失焦情況下,例如最小化,也能監(jiān)聽得到,其中XAML綁定命令和KeyDown事件不支持失焦情況,最小化等情況也就監(jiān)聽不到了,因此,要按業(yè)務(wù)選擇方案
5.DEMO
以上就是WPF實現(xiàn)監(jiān)聽快捷鍵的方式分享的詳細內(nèi)容,更多關(guān)于WPF監(jiān)聽快捷鍵的資料請關(guān)注腳本之家其它相關(guān)文章!
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