popupmenuchromium.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

{
    return m_listBox->handleMouseDownEvent(
        constructRelativeMouseEvent(event, this, m_listBox.get()));
}

bool PopupContainer::handleMouseMoveEvent(const PlatformMouseEvent& event)
{
    return m_listBox->handleMouseMoveEvent(
        constructRelativeMouseEvent(event, this, m_listBox.get()));
}

bool PopupContainer::handleMouseReleaseEvent(const PlatformMouseEvent& event)
{
    return m_listBox->handleMouseReleaseEvent(
        constructRelativeMouseEvent(event, this, m_listBox.get()));
}

bool PopupContainer::handleWheelEvent(const PlatformWheelEvent& event)
{
    return m_listBox->handleWheelEvent(
        constructRelativeWheelEvent(event, this, m_listBox.get()));
}

bool PopupContainer::handleKeyEvent(const PlatformKeyboardEvent& event)
{
    return m_listBox->handleKeyEvent(event);
}

void PopupContainer::hide()
{
    m_listBox->abandon();
}

void PopupContainer::paint(GraphicsContext* gc, const IntRect& rect)
{
    // adjust coords for scrolled frame
    IntRect r = intersection(rect, frameRect());
    int tx = x();
    int ty = y();

    r.move(-tx, -ty);

    gc->translate(static_cast<float>(tx), static_cast<float>(ty));
    m_listBox->paint(gc, r);
    gc->translate(-static_cast<float>(tx), -static_cast<float>(ty));

    paintBorder(gc, rect);
}

void PopupContainer::paintBorder(GraphicsContext* gc, const IntRect& rect)
{
    // FIXME: Where do we get the border color from?
    Color borderColor(127, 157, 185);

    gc->setStrokeStyle(NoStroke);
    gc->setFillColor(borderColor);

    int tx = x();
    int ty = y();

    // top, left, bottom, right
    gc->drawRect(IntRect(tx, ty, width(), kBorderSize));
    gc->drawRect(IntRect(tx, ty, kBorderSize, height()));
    gc->drawRect(IntRect(tx, ty + height() - kBorderSize, width(), kBorderSize));
    gc->drawRect(IntRect(tx + width() - kBorderSize, ty, kBorderSize, height()));
}

bool PopupContainer::isInterestedInEventForKey(int keyCode)
{
    return m_listBox->isInterestedInEventForKey(keyCode);
}

void PopupContainer::show(const IntRect& r, FrameView* v, int index)
{
    // The rect is the size of the select box. It's usually larger than we need.
    // subtract border size so that usually the container will be displayed 
    // exactly the same width as the select box.
    listBox()->setBaseWidth(max(r.width() - kBorderSize * 2, 0));

    listBox()->updateFromElement();

    // We set the selected item in updateFromElement(), and disregard the
    // index passed into this function (same as Webkit's PopupMenuWin.cpp)
    // FIXME: make sure this is correct, and add an assertion.
    // ASSERT(popupWindow(popup)->listBox()->selectedIndex() == index);

    // Convert point to main window coords.
    IntPoint location = v->contentsToWindow(r.location());

    // Move it below the select widget.
    location.move(0, r.height());

    IntRect popupRect(location, r.size());
    setFrameRect(popupRect);
    showPopup(v);
}

void PopupContainer::refresh()
{
    listBox()->updateFromElement();
    layout();
}

///////////////////////////////////////////////////////////////////////////////
// PopupListBox implementation

bool PopupListBox::handleMouseDownEvent(const PlatformMouseEvent& event)
{
    Scrollbar* scrollbar = scrollbarUnderMouse(event);
    if (scrollbar) {
        m_capturingScrollbar = scrollbar;
        m_capturingScrollbar->mouseDown(event);
        return true;
    }

    if (!isPointInBounds(event.pos()))
        abandon();

    return true;
}

bool PopupListBox::handleMouseMoveEvent(const PlatformMouseEvent& event)
{
    if (m_capturingScrollbar) {
        m_capturingScrollbar->mouseMoved(event);
        return true;
    }

    Scrollbar* scrollbar = scrollbarUnderMouse(event);
    if (m_lastScrollbarUnderMouse != scrollbar) {
        // Send mouse exited to the old scrollbar.
        if (m_lastScrollbarUnderMouse)
            m_lastScrollbarUnderMouse->mouseExited();
        m_lastScrollbarUnderMouse = scrollbar;
    }

    if (scrollbar) {
        scrollbar->mouseMoved(event);
        return true;
    }

    if (!isPointInBounds(event.pos()))
        return false;

    selectIndex(pointToRowIndex(event.pos()));
    return true;
}

bool PopupListBox::handleMouseReleaseEvent(const PlatformMouseEvent& event)
{
    if (m_capturingScrollbar) {
        m_capturingScrollbar->mouseUp();
        m_capturingScrollbar = 0;
        return true;
    }

    if (!isPointInBounds(event.pos()))
        return true;

    acceptIndex(pointToRowIndex(event.pos()));
    return true;
}

bool PopupListBox::handleWheelEvent(const PlatformWheelEvent& event)
{
    if (!isPointInBounds(event.pos())) {
        abandon();
        return true;
    }

    // Pass it off to the scroll view.
    // Sadly, WebCore devs don't understand the whole "const" thing.
    wheelEvent(const_cast<PlatformWheelEvent&>(event));
    return true;
}

// Should be kept in sync with handleKeyEvent().
bool PopupListBox::isInterestedInEventForKey(int keyCode)
{
    switch (keyCode) {
    case VKEY_ESCAPE:
    case VKEY_RETURN:
    case VKEY_UP:
    case VKEY_DOWN:
    case VKEY_PRIOR:
    case VKEY_NEXT:
    case VKEY_HOME:
    case VKEY_END:
    case VKEY_TAB:
        return true;
    default:
        return false;
    }
}

bool PopupListBox::handleKeyEvent(const PlatformKeyboardEvent& event)
{
    if (event.type() == PlatformKeyboardEvent::KeyUp)
        return true;

    if (numItems() == 0 && 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)  {
            m_popupClient->hidePopup();
            // Don't eat the enter if nothing is selected.
            return false;
        }
        acceptIndex(m_selectedIndex);  // may delete this
        return true;
    case VKEY_UP:
        selectPreviousRow();
        break;
    case VKEY_DOWN:
        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()))
            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_willAcceptOnAbandon = true;

        setOriginalIndex(m_selectedIndex);
        if (m_settings.setTextOnIndexChange)
            m_popupClient->setTextFromItem(m_selectedIndex);
    } else if (!m_settings.setTextOnIndexChange &&
               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)
            m_popupClient->setTextFromItem(m_selectedIndex);
        // Return false so the TAB key event is propagated to the page.
        return false;
    }

    return true;
}

HostWindow* PopupListBox::hostWindow() const
{
    // Our parent is the root ScrollView, so it is the one that has a
    // HostWindow.  FrameView::hostWindow() works similarly.
    return parent() ? parent()->hostWindow() : 0;
}

// From HTMLSelectElement.cpp
static String stripLeadingWhiteSpace(const String& string)
{
    int length = string.length();
    int i;
    for (i = 0; i < length; ++i)
        if (string[i] != noBreakSpace
            && (string[i] <= 0x7F ? !isspace(string[i]) : (direction(string[i]) != WhiteSpaceNeutral)))
            break;

    return string.substring(i, length - i);
}

// From HTMLSelectElement.cpp, with modifications
void PopupListBox::typeAheadFind(const PlatformKeyboardEvent& event)
{
    TimeStamp now = static_cast<TimeStamp>(currentTime() * 1000.0f);
    TimeStamp delta = now - m_lastCharTime;

    m_lastCharTime = now;

    UChar c = event.windowsVirtualKeyCode();

    String prefix;
    int searchStartOffset = 1;
    if (delta > kTypeAheadTimeoutMs) {
        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;
        }
    }

    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).startsWith(prefix, false)) {
            selectIndex(index);
            return;
        }
    }
}

void PopupListBox::paint(GraphicsContext* gc, const IntRect& rect)
{
    // adjust coords for scrolled frame
    IntRect r = intersection(rect, frameRect());
    int tx = x() - scrollX();
    int ty = y() - scrollY();

    r.move(-tx, -ty);

    // set clip rect to match revised damage rect
    gc->save();
    gc->translate(static_cast<float>(tx), static_cast<float>(ty));
    gc->clip(r);

    // FIXME: Can we optimize scrolling to not require repainting the entire
    // window?  Should we?
    for (int i = 0; i < numItems(); ++i)
        paintRow(gc, r, i);

    // Special case for an empty popup.
    if (numItems() == 0)
        gc->fillRect(r, Color::white);

    gc->restore();

    ScrollView::paint(gc, rect);
}

static const int separatorPadding = 4;
static const int separatorHeight = 1;

void PopupListBox::paintRow(GraphicsContext* gc, const IntRect& rect, int rowIndex)
{
    // This code is based largely on RenderListBox::paint* methods.

    IntRect rowRect = getRowBounds(rowIndex);
    if (!rowRect.intersects(rect))
        return;

    PopupMenuStyle style = m_popupClient->itemStyle(rowIndex);

    // Paint background
    Color backColor, textColor;
    if (rowIndex == m_selectedIndex) {
        backColor = theme()->activeListBoxSelectionBackgroundColor();
        textColor = theme()->activeListBoxSelectionForegroundColor();
    } else {
        backColor = style.backgroundColor();
        textColor = style.foregroundColor();
    }

    // If we have a transparent background, make sure it has a color to blend
    // against.
    if (backColor.hasAlpha())