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Merge pull request #2509 from cwensley/curtis/keyboard-modifierschanged
Add Keyboard.ModifiersChanged event
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,26 +1,140 @@ | ||
| namespace Eto.Wpf.Forms | ||
| #if WINFORMS | ||
|
|
||
| namespace Eto.WinForms.Forms | ||
| #else | ||
|
|
||
| namespace Eto.Wpf.Forms | ||
| #endif | ||
| { | ||
| public class KeyboardHandler : Keyboard.IHandler | ||
| { | ||
| public bool IsKeyLocked(Keys key) | ||
| EventHandler<EventArgs> _modifiersChanged; | ||
| Keys _modifiers; | ||
| List<Keys> _oldLockedKeys = new List<Keys>(); | ||
|
|
||
| Win32.HookProc _hookProc; | ||
| IntPtr _hookId; | ||
| Keys? _downKeys; | ||
| Keys? _upKeys; | ||
|
|
||
| IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam) | ||
| { | ||
| return swi.Keyboard.IsKeyToggled(key.ToWpfKey()); | ||
| // only trigger event when the application is active | ||
| if (nCode == 0 && Application.Instance.IsActive) | ||
| { | ||
| if (wParam == (IntPtr)Win32.WM.KEYDOWN || wParam == (IntPtr)Win32.WM.KEYUP | ||
| || wParam == (IntPtr)Win32.WM.SYSKEYDOWN || wParam == (IntPtr)Win32.WM.SYSKEYUP) | ||
| { | ||
| var kb = Marshal.PtrToStructure<Win32.KeyboardLowLevelHook>(lParam); | ||
| // Console.WriteLine($"Callback: {wParam:x}, {lParam}, {kb.VirtualKeyCode:x}, {kb.ScanCode:x}"); | ||
|
|
||
| // this event happens before the state is updated, so we check which key was pressed. | ||
| var keys = Keys.None; | ||
| switch (kb.VirtualKeyCode) | ||
| { | ||
| case (int)Win32.VK.RMENU: | ||
| case (int)Win32.VK.LMENU: | ||
| case (int)Win32.VK.MENU: | ||
| keys = Keys.Alt; | ||
| break; | ||
| case (int)Win32.VK.RCONTROL: | ||
| case (int)Win32.VK.LCONTROL: | ||
| case (int)Win32.VK.CONTROL: | ||
| keys = Keys.Control; | ||
| break; | ||
| case (int)Win32.VK.RSHIFT: | ||
| case (int)Win32.VK.LSHIFT: | ||
| case (int)Win32.VK.SHIFT: | ||
| keys = Keys.Shift; | ||
| break; | ||
| case (int)Win32.VK.RWIN: | ||
| case (int)Win32.VK.LWIN: | ||
| keys = Keys.Application; | ||
| break; | ||
| } | ||
| if (wParam == (IntPtr)Win32.WM.KEYDOWN || wParam == (IntPtr)Win32.WM.SYSKEYDOWN) | ||
| _downKeys = keys; | ||
| else if (wParam == (IntPtr)Win32.WM.KEYUP || wParam == (IntPtr)Win32.WM.SYSKEYUP) | ||
| _upKeys = keys; | ||
| TriggerChanged(); | ||
| _downKeys = null; | ||
| _upKeys = null; | ||
| } | ||
| } | ||
| return Win32.CallNextHookEx(_hookId, nCode, wParam, lParam); | ||
| } | ||
|
|
||
| public IEnumerable<Keys> SupportedLockKeys | ||
| public event EventHandler<EventArgs> ModifiersChanged | ||
| { | ||
| get | ||
| add | ||
| { | ||
| if (_modifiersChanged == null) | ||
| { | ||
| _hookProc = new Win32.HookProc(HookCallback); | ||
| _hookId = Win32.SetHook(Win32.WH.KEYBOARD_LL, _hookProc); | ||
| _modifiers = Modifiers; | ||
| _oldLockedKeys.Clear(); | ||
| _oldLockedKeys.AddRange(SupportedLockKeys.Where(IsKeyLocked)); | ||
| } | ||
| _modifiersChanged += value; | ||
| } | ||
| remove | ||
| { | ||
| yield return Keys.CapsLock; | ||
| yield return Keys.NumberLock; | ||
| yield return Keys.ScrollLock; | ||
| yield return Keys.Insert; | ||
| _modifiersChanged -= value; | ||
| if (_modifiersChanged == null && _hookId != IntPtr.Zero) | ||
| { | ||
| Win32.UnhookWindowsHookEx(_hookId); | ||
| _hookProc = null; | ||
| _hookId = IntPtr.Zero; | ||
| _modifiers = Keys.None; | ||
| _oldLockedKeys.Clear(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private void TriggerChanged() | ||
| { | ||
| var newModifiers = Modifiers; | ||
| var newLockedKeys = SupportedLockKeys.Where(IsKeyLocked).ToList(); | ||
|
|
||
| if (_modifiers != newModifiers || !_oldLockedKeys.SequenceEqual(newLockedKeys)) | ||
| { | ||
| _modifiers = newModifiers; | ||
| _oldLockedKeys = newLockedKeys; | ||
| _modifiersChanged?.Invoke(null, EventArgs.Empty); | ||
| } | ||
| } | ||
|
|
||
| #if WINFORMS | ||
| public bool IsKeyLocked(Keys key) => swf.Control.IsKeyLocked(key.ToSWF()); | ||
| #else | ||
| public bool IsKeyLocked(Keys key) => swi.Keyboard.IsKeyToggled(key.ToWpfKey()); | ||
| #endif | ||
|
|
||
| static readonly Keys[] _supportedLockKeys = new[] { | ||
| Keys.CapsLock, | ||
| Keys.NumberLock, | ||
| Keys.ScrollLock, | ||
| Keys.Insert | ||
| }; | ||
|
|
||
| public IEnumerable<Keys> SupportedLockKeys => _supportedLockKeys; | ||
|
|
||
| public Keys Modifiers | ||
| { | ||
| get { return swi.Keyboard.Modifiers.ToEto(); } | ||
| get | ||
| { | ||
| #if WINFORMS | ||
| var modifiers = swf.Control.ModifierKeys.ToEto(); | ||
| #else | ||
| var modifiers = swi.Keyboard.Modifiers.ToEto(); | ||
| #endif | ||
| if (_downKeys != null) | ||
| modifiers |= _downKeys.Value; | ||
| if (_upKeys != null) | ||
| modifiers &= ~_upKeys.Value; | ||
| return modifiers; | ||
| } | ||
| } | ||
| } | ||
| } |
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