NS_IMETHODIMP
EditorEventListener::HandleEvent(nsIDOMEvent* aEvent)
{
NS_ENSURE_TRUE(mEditorBase, NS_ERROR_FAILURE);
nsCOMPtr<nsIEditor> kungFuDeathGrip = mEditorBase;
Unused << kungFuDeathGrip; // mEditorBase is not referred to in this function
WidgetEvent* internalEvent = aEvent->WidgetEventPtr();
// Let's handle each event with the message of the internal event of the
// coming event. If the DOM event was created with improper interface,
// e.g., keydown event is created with |new MouseEvent("keydown", {});|,
// its message is always 0. Therefore, we can ban such strange event easy.
// However, we need to handle strange "focus" and "blur" event. See the
// following code of this switch statement.
// NOTE: Each event handler may require specific event interface. Before
// calling it, this queries the specific interface. If it would fail,
// each event handler would just ignore the event. So, in this method,
// you don't need to check if the QI succeeded before each call.
switch (internalEvent->mMessage) {
// dragenter
case eDragEnter: {
nsCOMPtr<nsIDOMDragEvent> dragEvent = do_QueryInterface(aEvent);
return DragEnter(dragEvent);
}
// dragover
case eDragOver: {
nsCOMPtr<nsIDOMDragEvent> dragEvent = do_QueryInterface(aEvent);
return DragOver(dragEvent);
}
// dragexit
case eDragExit: {
nsCOMPtr<nsIDOMDragEvent> dragEvent = do_QueryInterface(aEvent);
return DragExit(dragEvent);
}
// drop
case eDrop: {
nsCOMPtr<nsIDOMDragEvent> dragEvent = do_QueryInterface(aEvent);
return Drop(dragEvent);
}
#ifdef HANDLE_NATIVE_TEXT_DIRECTION_SWITCH
// keydown
case eKeyDown: {
nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aEvent);
return KeyDown(keyEvent);
}
// keyup
case eKeyUp: {
nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aEvent);
return KeyUp(keyEvent);
}
#endif // #ifdef HANDLE_NATIVE_TEXT_DIRECTION_SWITCH
// keypress
case eKeyPress: {
nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aEvent);
return KeyPress(keyEvent);
}
// mousedown
case eMouseDown: {
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
NS_ENSURE_TRUE(mouseEvent, NS_OK);
// EditorEventListener may receive (1) all mousedown, mouseup and click
// events, (2) only mousedown event or (3) only mouseup event.
// mMouseDownOrUpConsumedByIME is used only for ignoring click event if
// preceding mousedown and/or mouseup event is consumed by IME.
// Therefore, even if case #2 or case #3 occurs,
// mMouseDownOrUpConsumedByIME is true here. Therefore, we should always
// overwrite it here.
mMouseDownOrUpConsumedByIME = NotifyIMEOfMouseButtonEvent(mouseEvent);
return mMouseDownOrUpConsumedByIME ? NS_OK : MouseDown(mouseEvent);
}
// mouseup
case eMouseUp: {
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
NS_ENSURE_TRUE(mouseEvent, NS_OK);
// See above comment in the eMouseDown case, first.
// This code assumes that case #1 is occuring. However, if case #3 may
// occurs after case #2 and the mousedown is consumed,
// mMouseDownOrUpConsumedByIME is true even though EditorEventListener
// has not received the preceding mousedown event of this mouseup event.
// So, mMouseDownOrUpConsumedByIME may be invalid here. However,
// this is not a matter because mMouseDownOrUpConsumedByIME is referred
// only by eMouseClick case but click event is fired only in case #1.
// So, before a click event is fired, mMouseDownOrUpConsumedByIME is
// always initialized in the eMouseDown case if it's referred.
if (NotifyIMEOfMouseButtonEvent(mouseEvent)) {
mMouseDownOrUpConsumedByIME = true;
}
return mMouseDownOrUpConsumedByIME ? NS_OK : MouseUp(mouseEvent);
}
// click
case eMouseClick: {
nsCOMPtr<nsIDOMMouseEvent> mouseEvent = do_QueryInterface(aEvent);
NS_ENSURE_TRUE(mouseEvent, NS_OK);
// If the preceding mousedown event or mouseup event was consumed,
// editor shouldn't handle this click event.
if (mMouseDownOrUpConsumedByIME) {
mMouseDownOrUpConsumedByIME = false;
mouseEvent->AsEvent()->PreventDefault();
return NS_OK;
}
return MouseClick(mouseEvent);
}
// focus
case eFocus:
return Focus(aEvent);
// blur
case eBlur:
return Blur(aEvent);
// text
case eCompositionChange:
return HandleText(aEvent);
// compositionstart
case eCompositionStart:
return HandleStartComposition(aEvent);
// compositionend
case eCompositionEnd:
HandleEndComposition(aEvent);
return NS_OK;
default:
break;
}
nsAutoString eventType;
aEvent->GetType(eventType);
// We should accept "focus" and "blur" event even if it's synthesized with
// wrong interface for compatibility with older Gecko.
if (eventType.EqualsLiteral("focus")) {
return Focus(aEvent);
}
if (eventType.EqualsLiteral("blur")) {
return Blur(aEvent);
}
#ifdef DEBUG
nsPrintfCString assertMessage("Editor doesn't handle \"%s\" event "
"because its internal event doesn't have proper message",
NS_ConvertUTF16toUTF8(eventType).get());
NS_ASSERTION(false, assertMessage.get());
#endif
return NS_OK;
}
LRESULT CALLBACK CompStrWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HIMC hIMC = NULL;
HIMC hOldIMC = NULL;
switch (message)
{
case WM_CREATE:
hIMC = ImmCreateContext();
hOldIMC = ImmAssociateContext(hWnd,hIMC);
SetWindowLongPtr(hWnd, 0, (LONG_PTR)hOldIMC);
fdwProperty = ImmGetProperty(GetKeyboardLayout(0), IGP_PROPERTY);
break;
case WM_CHAR:
HandleChar(hWnd,wParam,lParam);
break;
case WM_LBUTTONUP: /* fall-through */
case WM_RBUTTONUP:
if (hIMC = ImmGetContext(hWnd))
{
HMENU hMenu = NULL;
InitMenuItemIDTable();
hMenu = CreateImeMenu(hWnd, hIMC, NULL,(message == WM_RBUTTONUP));
if (hMenu)
{
DWORD dwItemData;
DWORD dwPos = (DWORD)GetMessagePos();
int nCmd;
nCmd = TrackPopupMenuEx(hMenu,
TPM_RETURNCMD | TPM_NONOTIFY |
TPM_LEFTBUTTON | TPM_LEFTALIGN | TPM_TOPALIGN,
LOWORD(dwPos), HIWORD(dwPos),
hWnd, NULL);
if (nCmd)
{
nCmd -= IDM_STARTIMEMENU;
dwItemData = FindItemData(nCmd);
ImmNotifyIME(hIMC, NI_IMEMENUSELECTED, nCmd, dwItemData);
}
}
EndMenuItemIDTable();
DestroyMenu(hMenu);
}
break;
case WM_IME_SETCONTEXT:
if (fShowCand)
{
lParam &= ~ISC_SHOWUICANDIDATEWINDOW;
}
if (fdwProperty & IME_PROP_SPECIAL_UI)
{
// EMPTY
}
else if (fdwProperty & IME_PROP_AT_CARET)
{
lParam &= ~ISC_SHOWUICOMPOSITIONWINDOW;
}
else
{
// EMPTY
}
return (DefWindowProc(hWnd, message, wParam, lParam));
case WM_IME_STARTCOMPOSITION:
// Normally, we should not call into HandleStartComposition
// for IME_PROP_SPECIAL_UI and not IME_PROP_AT_CARET IMEs
// we should pass this message to DefWindowProc directly for
// this kind of IMEs
HandleStartComposition(hWnd,wParam,lParam);
// pass this message to DefWindowProc for IME_PROP_SPECIAL_UI
// and not IME_PROP_AT_CARET IMEs
if (fdwProperty & IME_PROP_SPECIAL_UI)
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
else if (fdwProperty & IME_PROP_AT_CARET)
{
// EMPTY
}
else
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
break;
case WM_IME_ENDCOMPOSITION:
// Normally, we should not call into HandleEndComposition
// for IME_PROP_SPECIAL_UI and not IME_PROP_AT_CARET IMEs
// we should pass this message to DefWindowProc directly for
// this kind of IMEs
HandleEndComposition(hWnd,wParam,lParam);
// pass this message to DefWindowProc for IME_PROP_SPECIAL_UI
// and not IME_PROP_AT_CARET IMEs
if (fdwProperty & IME_PROP_SPECIAL_UI)
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
else if (fdwProperty & IME_PROP_AT_CARET)
{
// EMPTY
}
else
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
break;
case WM_IME_COMPOSITION:
// Normally, we should not call into HandleComposition
// for IME_PROP_SPECIAL_UI and not IME_PROP_AT_CARET IMEs
// we should pass this message to DefWindowProc directly for
// this kind of IMEs
HandleComposition(hWnd,wParam,lParam);
// pass this message to DefWindowProc for IME_PROP_SPECIAL_UI
// and not IME_PROP_AT_CARET IMEs
if (fdwProperty & IME_PROP_SPECIAL_UI)
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
else if (fdwProperty & IME_PROP_AT_CARET)
{
// EMPTY
}
else
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
break;
case WM_PAINT:
HandlePaint(hWnd,wParam,lParam);
break;
case WM_IME_NOTIFY:
{
LRESULT lRet;
// Normally, we should not call into HandleNotify
// for IME_PROP_SPECIAL_UI and not IME_PROP_AT_CARET IMEs
// we should pass this message to DefWindowProc directly for
// this kind of IMEs
lRet = HandleNotify(hWnd, message, wParam, lParam);
// pass this message to DefWindowProc for IME_PROP_SPECIAL_UI
// and not IME_PROP_AT_CARET IMEs
if (fdwProperty & IME_PROP_SPECIAL_UI)
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
else if (fdwProperty & IME_PROP_AT_CARET)
{
// EMPTY
}
else
{
return (DefWindowProc(hWnd, message, wParam, lParam));
}
return lRet;
}
case WM_DESTROY:
hOldIMC = (HIMC)GetWindowLongPtr(hWnd, 0);
hIMC = ImmAssociateContext(hWnd, hOldIMC);
ImmDestroyContext(hIMC);
break;
case WM_INPUTLANGCHANGE:
fdwProperty = ImmGetProperty(GetKeyboardLayout(0), IGP_PROPERTY);
if (hIMC = ImmGetContext(hWnd))
{
CANDIDATEFORM cdf = {0};
if (fdwProperty & IME_PROP_AT_CARET)
{
cdf.dwIndex = 0;
cdf.dwStyle = CFS_CANDIDATEPOS;
cdf.ptCurrentPos.x = ptImeUIPos.x;
cdf.ptCurrentPos.y = ptImeUIPos.y;
ImmSetCandidateWindow(hIMC, &cdf);
}
else
{
UINT i;
// The candidate position should be decided by a near caret
// IME. There are 4 candidate form in the input context
for (i = 0; i < 4; i++)
{
if (!ImmGetCandidateWindow(hIMC, i, &cdf))
{
continue;
}
if (cdf.dwStyle == CFS_DEFAULT)
{
continue;
}
cdf.dwStyle = CFS_DEFAULT;
ImmSetCandidateWindow(hIMC, &cdf);
}
}
ImmReleaseContext(hWnd, hIMC);
}
return (DefWindowProc(hWnd, message, wParam, lParam));
default:
return (DefWindowProc(hWnd, message, wParam, lParam));
}
return 0L;
}