// From HTMLSelectElement.cpp, with modifications
void PopupListBox::typeAheadFind(const PlatformKeyboardEvent& event)
{
TimeStamp now = static_cast<TimeStamp>(currentTime() * 1000.0f);
TimeStamp delta = now - m_lastCharTime;
// Reset the time when user types in a character. The time gap between
// last character and the current character is used to indicate whether
// user typed in a string or just a character as the search prefix.
m_lastCharTime = now;
UChar c = event.windowsVirtualKeyCode();
String prefix;
int searchStartOffset = 1;
if (delta > typeAheadTimeoutMs) {
m_typedString = prefix = String(&c, 1);
m_repeatingChar = c;
} else {
m_typedString.append(c);
if (c == m_repeatingChar) {
// The user is likely trying to cycle through all the items starting
// with this character, so just search on the character.
prefix = String(&c, 1);
} else {
m_repeatingChar = 0;
prefix = m_typedString;
searchStartOffset = 0;
}
}
// Compute a case-folded copy of the prefix string before beginning the
// search for a matching element. This code uses foldCase to work around the
// fact that String::startWith does not fold non-ASCII characters. This code
// can be changed to use startWith once that is fixed.
String prefixWithCaseFolded(prefix.foldCase());
int itemCount = numItems();
int index = (max(0, m_selectedIndex) + searchStartOffset) % itemCount;
for (int i = 0; i < itemCount; i++, index = (index + 1) % itemCount) {
if (!isSelectableItem(index))
continue;
if (stripLeadingWhiteSpace(m_items[index]->label).foldCase().startsWith(prefixWithCaseFolded)) {
selectIndex(index);
return;
}
}
}
static inline KeyboardEvent::KeyLocationCode keyLocationCode(const PlatformKeyboardEvent& key)
{
if (key.isKeypad())
return KeyboardEvent::DOM_KEY_LOCATION_NUMPAD;
switch (key.windowsVirtualKeyCode()) {
case VK_LCONTROL:
case VK_LSHIFT:
case VK_LMENU:
case VK_LWIN:
return KeyboardEvent::DOM_KEY_LOCATION_LEFT;
case VK_RCONTROL:
case VK_RSHIFT:
case VK_RMENU:
case VK_RWIN:
return KeyboardEvent::DOM_KEY_LOCATION_RIGHT;
default:
return KeyboardEvent::DOM_KEY_LOCATION_STANDARD;
}
}
bool PopupListBox::handleKeyEvent(const PlatformKeyboardEvent& event)
{
if (event.type() == PlatformEvent::KeyUp)
return true;
if (!numItems() && event.windowsVirtualKeyCode() != VKEY_ESCAPE)
return true;
switch (event.windowsVirtualKeyCode()) {
case VKEY_ESCAPE:
abandon(); // may delete this
return true;
case VKEY_RETURN:
if (m_selectedIndex == -1) {
hidePopup();
// Don't eat the enter if nothing is selected.
return false;
}
acceptIndex(m_selectedIndex); // may delete this
return true;
case VKEY_UP:
case VKEY_DOWN:
// We have to forward only shift + up combination to focused node when
// autofill popup. Because all characters from the cursor to the start
// of the text area should selected when you press shift + up arrow.
// shift + down should be the similar way to shift + up.
if (event.modifiers() && m_popupClient->menuStyle().menuType() == PopupMenuStyle::AutofillPopup)
m_focusedElement->dispatchKeyEvent(event);
else if (event.windowsVirtualKeyCode() == VKEY_UP)
selectPreviousRow();
else
selectNextRow();
break;
case VKEY_PRIOR:
adjustSelectedIndex(-m_visibleRows);
break;
case VKEY_NEXT:
adjustSelectedIndex(m_visibleRows);
break;
case VKEY_HOME:
adjustSelectedIndex(-m_selectedIndex);
break;
case VKEY_END:
adjustSelectedIndex(m_items.size());
break;
default:
if (!event.ctrlKey() && !event.altKey() && !event.metaKey()
&& isPrintableChar(event.windowsVirtualKeyCode())
&& isCharacterTypeEvent(event))
typeAheadFind(event);
break;
}
if (m_originalIndex != m_selectedIndex) {
// Keyboard events should update the selection immediately (but we don't
// want to fire the onchange event until the popup is closed, to match
// IE). We change the original index so we revert to that when the
// popup is closed.
if (m_settings.acceptOnAbandon)
m_acceptedIndexOnAbandon = m_selectedIndex;
setOriginalIndex(m_selectedIndex);
if (m_settings.setTextOnIndexChange)
m_popupClient->setTextFromItem(m_selectedIndex);
}
if (event.windowsVirtualKeyCode() == VKEY_TAB) {
// TAB is a special case as it should select the current item if any and
// advance focus.
if (m_selectedIndex >= 0) {
acceptIndex(m_selectedIndex); // May delete us.
// Return false so the TAB key event is propagated to the page.
return false;
}
// Call abandon() so we honor m_acceptedIndexOnAbandon if set.
abandon();
// Return false so the TAB key event is propagated to the page.
return false;
}
return true;
}