C++ PlatformKeyboardEvent类代码示例

static inline KeyboardEvent::KeyLocationCode keyLocationCode(const PlatformKeyboardEvent& key)
{
    if (key.isKeypad())
        return KeyboardEvent::DOM_KEY_LOCATION_NUMPAD;
    if (key.modifiers() & PlatformEvent::IsLeft)
        return KeyboardEvent::DOM_KEY_LOCATION_LEFT;
    if (key.modifiers() & PlatformEvent::IsRight)
        return KeyboardEvent::DOM_KEY_LOCATION_RIGHT;
    return KeyboardEvent::DOM_KEY_LOCATION_STANDARD;
}

KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()), true, true, view, 0, key.modifiers(), InputDeviceCapabilities::doesntFireTouchEventsSourceCapabilities())
    , m_keyEvent(adoptPtr(new PlatformKeyboardEvent(key)))
    , m_keyIdentifier(key.keyIdentifier())
    , m_code(key.code())
    , m_key(key.key())
    , m_location(keyLocationCode(key))
{
    setPlatformTimeStamp(key.timestamp());
    initLocationModifiers(m_location);
}

// FIXME: This needs to be unified with the keyPress method on FrameMac
bool FrameWin::keyPress(const PlatformKeyboardEvent& keyEvent)
{
    bool result;
    // Check for cases where we are too early for events -- possible unmatched key up
    // from pressing return in the location bar.
    Document *doc = document();
    if (!doc)
        return false;
    Node *node = doc->focusNode();
    if (!node) {
        if (doc->isHTMLDocument())
            node = doc->body();
        else
            node = doc->documentElement();
        if (!node)
            return false;
    }
    
    if (!keyEvent.isKeyUp())
        prepareForUserAction();

    result = !EventTargetNodeCast(node)->dispatchKeyEvent(keyEvent);

    // FIXME: FrameMac has a keyDown/keyPress hack here which we are not copying.

    return result;
}

static bool isCharacterTypeEvent(const PlatformKeyboardEvent& event)
{
    // Check whether the event is a character-typed event or not.
    // We use RawKeyDown/Char/KeyUp event scheme on all platforms,
    // so PlatformKeyboardEvent::Char (not RawKeyDown) type event
    // is considered as character type event.
    return event.type() == PlatformEvent::Char;
}

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;
    }
}

static void handleKeyPress(Frame& frame, KeyboardEvent& event, const PlatformKeyboardEvent& platformEvent)
{
    String commandName = interpretKeyEvent(event);

    if (!commandName.isEmpty()) {
        frame.editor().command(commandName).execute();
        event.setDefaultHandled();
        return;
    }

    // Don't insert null or control characters as they can result in unexpected behaviour
    if (event.charCode() < ' ')
        return;

    // Don't insert anything if a modifier is pressed and it has not been handled yet
    if (platformEvent.ctrlKey() || platformEvent.altKey())
        return;

    if (frame.editor().insertText(platformEvent.text(), &event))
        event.setDefaultHandled();
}

KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()), true, true, view, 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey(), InputDevice::doesntFireTouchEventsInputDevice())
    , m_keyEvent(adoptPtr(new PlatformKeyboardEvent(key)))
    , m_keyIdentifier(key.keyIdentifier())
    , m_code(key.code())
    , m_key(key.key())
    , m_location(keyLocationCode(key))
    , m_isAutoRepeat(key.isAutoRepeat())
    , m_bbIsNumLock(key.bbIsNumLock())
{
    setUICreateTime(key.timestamp());
}

KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()),
                          true, true, view, 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey())
    , m_keyEvent(adoptPtr(new PlatformKeyboardEvent(key)))
    , m_keyIdentifier(key.keyIdentifier())
    , m_keyLocation(key.isKeypad() ? DOM_KEY_LOCATION_NUMPAD : DOM_KEY_LOCATION_STANDARD) // FIXME: differentiate right/left, too
    , m_altGraphKey(false)
{
}

// 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;
        }
    }
}

KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()),
                          true, true, view, 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey())
    , m_keyEvent(adoptPtr(new PlatformKeyboardEvent(key)))
    , m_keyIdentifier(key.keyIdentifier())
    , m_location(keyLocationCode(key))
    , m_altGraphKey(false)
    , m_isAutoRepeat(key.isAutoRepeat())
{
    ScriptWrappable::init(this);
}

KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()),
                          true, true, key.timestamp(), view, 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey())
    , m_keyEvent(std::make_unique<PlatformKeyboardEvent>(key))
    , m_keyIdentifier(key.keyIdentifier())
    , m_location(keyLocationCode(key))
    , m_altGraphKey(false)
#if PLATFORM(COCOA)
#if USE(APPKIT)
    , m_handledByInputMethod(key.handledByInputMethod())
    , m_keypressCommands(key.commands())
#else
    , m_handledByInputMethod(false)
#endif
#endif
{
}

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;
}