public bool OnKeyEvent(CefSharp.IWebBrowser chromiumWebBrowser, CefSharp.IBrowser browser, CefSharp.KeyType type, int windowsKeyCode, int nativeKeyCode, CefSharp.CefEventFlags modifiers, bool isSystemKey)
{
Debug.WriteLine("OnKeyEvent: KeyType: {0} 0x{1:X} Modifiers: {2}", type, windowsKeyCode, modifiers);
return(false);
}
public bool OnPreKeyEvent(CefSharp.IWebBrowser chromiumWebBrowser, CefSharp.IBrowser browser, CefSharp.KeyType type, int windowsKeyCode, int nativeKeyCode, CefSharp.CefEventFlags modifiers, bool isSystemKey, ref bool isKeyboardShortcut)
{
const int WM_SYSKEYDOWN = 0x104;
const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
const int WM_SYSKEYUP = 0x105;
const int WM_CHAR = 0x102;
const int WM_SYSCHAR = 0x106;
const int VK_TAB = 0x9;
const int VK_LEFT = 0x25;
const int VK_UP = 0x26;
const int VK_RIGHT = 0x27;
const int VK_DOWN = 0x28;
isKeyboardShortcut = false;
// Don't deal with TABs by default:
// TODO: Are there any additional ones we need to be careful of?
// i.e. Escape, Return, etc...?
if (windowsKeyCode == VK_TAB || windowsKeyCode == VK_LEFT || windowsKeyCode == VK_UP || windowsKeyCode == VK_DOWN || windowsKeyCode == VK_RIGHT)
{
return(false);
}
var result = false;
var control = chromiumWebBrowser as System.Windows.Forms.Control;
var msgType = 0;
switch (type)
{
case KeyType.RawKeyDown:
if (isSystemKey)
{
msgType = WM_SYSKEYDOWN;
}
else
{
msgType = WM_KEYDOWN;
}
break;
case KeyType.KeyUp:
if (isSystemKey)
{
msgType = WM_SYSKEYUP;
}
else
{
msgType = WM_KEYUP;
}
break;
case KeyType.Char:
if (isSystemKey)
{
msgType = WM_SYSCHAR;
}
else
{
msgType = WM_CHAR;
}
break;
default:
Trace.Assert(false);
break;
}
// We have to adapt from CEF's UI thread message loop to our fronting WinForm control here.
// So, we have to make some calls that Application.Run usually ends up handling for us:
var state = PreProcessControlState.MessageNotNeeded;
// We can't use BeginInvoke here, because we need the results for the return value
// and isKeyboardShortcut. In theory this shouldn't deadlock, because
// atm this is the only synchronous operation between the two threads.
control.Invoke(new Action(() =>
{
var msg = new Message
{
HWnd = control.Handle,
Msg = msgType,
WParam = new IntPtr(windowsKeyCode),
LParam = new IntPtr(nativeKeyCode)
};
// First comes Application.AddMessageFilter related processing:
// 99.9% of the time in WinForms this doesn't do anything interesting.
var processed = Application.FilterMessage(ref msg);
if (processed)
{
state = PreProcessControlState.MessageProcessed;
}
else
{
// Next we see if our control (or one of its parents)
// wants first crack at the message via several possible Control methods.
// This includes things like Mnemonics/Accelerators/Menu Shortcuts/etc...
state = control.PreProcessControlMessage(ref msg);
}
}));
if (state == PreProcessControlState.MessageNeeded)
{
// TODO: Determine how to track MessageNeeded for OnKeyEvent.
isKeyboardShortcut = true;
}
else if (state == PreProcessControlState.MessageProcessed)
{
// Most of the interesting cases get processed by PreProcessControlMessage.
result = true;
}
Debug.WriteLine("OnPreKeyEvent: KeyType: {0} 0x{1:X} Modifiers: {2}", type, windowsKeyCode, modifiers);
Debug.WriteLine("OnPreKeyEvent PreProcessControlState: {0}", state);
return(result);
}