public void onKeyDown(KeyDownEvent event) {
int keyCode = event.getNativeKeyCode();
for (KeyDownPreviewHandler handler : keyDownPreviewHandlers_) {
if (handler.previewKeyDown(event.getNativeEvent())) {
event.preventDefault();
event.stopPropagation();
return;
}
}
if (event.getNativeKeyCode() == KeyCodes.KEY_TAB) event.preventDefault();
int modifiers = KeyboardShortcut.getModifierValue(event.getNativeEvent());
if (event.isUpArrow() && modifiers == 0) {
if ((input_.getCurrentLineNum() == 0) || input_.isCursorAtEnd()) {
event.preventDefault();
event.stopPropagation();
navigateHistory(-1);
}
} else if (event.isDownArrow() && modifiers == 0) {
if ((input_.getCurrentLineNum() == input_.getCurrentLineCount() - 1)
|| input_.isCursorAtEnd()) {
event.preventDefault();
event.stopPropagation();
navigateHistory(1);
}
} else if (keyCode == KeyCodes.KEY_ENTER && modifiers == 0) {
event.preventDefault();
event.stopPropagation();
restoreFocus_ = true;
processCommandEntry();
} else if (keyCode == KeyCodes.KEY_ESCAPE && modifiers == 0) {
event.preventDefault();
if (input_.getText().length() == 0) {
// view_.isPromptEmpty() is to check for cases where the
// server is prompting but not at the top level. Escape
// needs to send null in those cases.
// For example, try "scan()" function
if (view_.isPromptEmpty()) {
// interrupt server
server_.interrupt(
new VoidServerRequestCallback() {
@Override
public void onError(ServerError error) {
super.onError(error);
globalDisplay_.showErrorMessage(
"Error Interrupting Server", error.getUserMessage());
}
});
} else {
// if the input is already empty then send a console reset
// which will jump us back to the main prompt
eventBus_.fireEvent(new ConsoleInputEvent(null));
}
}
input_.clear();
} else {
int mod = KeyboardShortcut.getModifierValue(event.getNativeEvent());
if (mod == KeyboardShortcut.CTRL) {
switch (keyCode) {
case 'L':
Shell.this.onConsoleClear();
event.preventDefault();
break;
}
} else if (mod == KeyboardShortcut.ALT) {
switch (keyCode) {
case 189: // hyphen
event.preventDefault();
event.stopPropagation();
input_.replaceSelection(" <- ", true);
break;
}
} else if ((BrowseCap.hasMetaKey()
&& (mod == (KeyboardShortcut.META + KeyboardShortcut.SHIFT)))
|| (!BrowseCap.hasMetaKey()
&& (mod == (KeyboardShortcut.CTRL + KeyboardShortcut.SHIFT)))) {
switch (keyCode) {
case KeyCodes.KEY_M:
event.preventDefault();
event.stopPropagation();
input_.replaceSelection(" %>% ", true);
break;
}
}
}
}
