C++ FontCascade::width方法代码示例

static void doDrawTextAtPoint(GraphicsContext& context, const String& text, const IntPoint& point, const FontCascade& font, const Color& color, int underlinedIndex)
{
    TextRun run(text);

    context.setFillColor(color);
    if (isOneLeftToRightRun(run))
        font.drawText(context, run, point);
    else
        context.drawBidiText(font, run, point);

    if (underlinedIndex >= 0) {
        ASSERT_WITH_SECURITY_IMPLICATION(underlinedIndex < static_cast<int>(text.length()));

        int beforeWidth;
        if (underlinedIndex > 0) {
            TextRun beforeRun(StringView(text).substring(0, underlinedIndex));
            beforeWidth = font.width(beforeRun);
        } else
            beforeWidth = 0;

        TextRun underlinedRun(StringView(text).substring(underlinedIndex, 1));
        int underlinedWidth = font.width(underlinedRun);

        IntPoint underlinePoint(point);
        underlinePoint.move(beforeWidth, 1);

        context.setStrokeColor(color);
        context.drawLineForText(underlinePoint, underlinedWidth, false);
    }
}

bool RenderEmbeddedObject::getReplacementTextGeometry(const LayoutPoint& accumulatedOffset, FloatRect& contentRect, FloatRect& indicatorRect, FloatRect& replacementTextRect, FloatRect& arrowRect, FontCascade& font, TextRun& run, float& textWidth) const
{
    bool includesArrow = shouldUnavailablePluginMessageBeButton(document(), m_pluginUnavailabilityReason);

    contentRect = contentBoxRect();
    contentRect.moveBy(roundedIntPoint(accumulatedOffset));

    FontCascadeDescription fontDescription;
    RenderTheme::defaultTheme()->systemFont(CSSValueWebkitSmallControl, fontDescription);
    fontDescription.setWeight(FontWeightBold);
    fontDescription.setRenderingMode(frame().settings().fontRenderingMode());
    fontDescription.setComputedSize(12);
    font = FontCascade(fontDescription, 0, 0);
    font.update(0);

    run = TextRun(m_unavailablePluginReplacementText);
    textWidth = font.width(run);

    replacementTextRect.setSize(FloatSize(textWidth + replacementTextRoundedRectLeftTextMargin + (includesArrow ? replacementTextRoundedRectRightTextMarginWithArrow : replacementTextRoundedRectRightTextMargin), replacementTextRoundedRectHeight));
    float x = (contentRect.size().width() / 2 - replacementTextRect.size().width() / 2) + contentRect.location().x();
    float y = (contentRect.size().height() / 2 - replacementTextRect.size().height() / 2) + contentRect.location().y();
    replacementTextRect.setLocation(FloatPoint(x, y));

    indicatorRect = replacementTextRect;

    // Expand the background rect to include the arrow, if it will be used.
    if (includesArrow) {
        arrowRect = indicatorRect;
        arrowRect.setX(ceilf(arrowRect.maxX() + replacementArrowLeftMargin));
        arrowRect.setWidth(arrowRect.height());
        indicatorRect.unite(arrowRect);
    }

    return true;
}

static float stringWidth(const FontCascade& renderer, const UChar* characters, unsigned length, bool disableRoundingHacks)
{
    TextRun run(characters, length);
    if (disableRoundingHacks)
        run.disableRoundingHacks();
    return renderer.width(run);
}

void FullscreenVideoController::draw()
{
    auto bitmapDC = adoptGDIObject(::CreateCompatibleDC(HWndDC(m_hudWindow)));
    HGDIOBJ oldBitmap = SelectObject(bitmapDC.get(), m_bitmap.get());

    GraphicsContext context(bitmapDC.get(), true);

    context.save();

    // Draw the background
    IntSize outerRadius(borderRadius, borderRadius);
    IntRect outerRect(0, 0, windowWidth, windowHeight);
    IntSize innerRadius(borderRadius - borderThickness, borderRadius - borderThickness);
    IntRect innerRect(borderThickness, borderThickness, windowWidth - borderThickness * 2, windowHeight - borderThickness * 2);

    context.fillRoundedRect(FloatRoundedRect(outerRect, outerRadius, outerRadius, outerRadius, outerRadius), Color(borderColor));
    context.setCompositeOperation(CompositeCopy);
    context.fillRoundedRect(FloatRoundedRect(innerRect, innerRadius, innerRadius, innerRadius, innerRadius), Color(backgroundColor));

    // Draw the widgets
    m_playPauseButton.draw(context);
    m_volumeUpButton.draw(context);
    m_volumeSliderButton.draw(context);
    m_volumeDownButton.draw(context);
    m_timeSliderButton.draw(context);
    m_exitFullscreenButton.draw(context);
    m_volumeSlider.draw(context);
    m_timeSlider.draw(context);

    // Draw the text strings
    FontCascadeDescription desc;

    NONCLIENTMETRICS metrics;
    metrics.cbSize = sizeof(metrics);
    SystemParametersInfo(SPI_GETNONCLIENTMETRICS, metrics.cbSize, &metrics, 0);
    desc.setOneFamily(metrics.lfSmCaptionFont.lfFaceName);

    desc.setComputedSize(textSize);
    FontCascade font = FontCascade(desc, 0, 0);
    font.update(0);

    String s;

    // The y positioning of these two text strings is tricky because they are so small. They
    // are currently positioned relative to the center of the slider and then down the font
    // height / 4 (which is actually half of font height /2), which positions the center of
    // the text at the center of the slider.
    // Left string
    s = timeToString(currentTime());
    int fontHeight = font.fontMetrics().height();
    TextRun leftText(s);
    context.setFillColor(Color(textColor));
    context.drawText(font, leftText, IntPoint(windowWidth / 2 - timeSliderWidth / 2 - margin - font.width(leftText), windowHeight - margin - sliderHeight / 2 + fontHeight / 4));

    // Right string
    s = timeToString(currentTime() - duration());
    TextRun rightText(s);
    context.setFillColor(Color(textColor));
    context.drawText(font, rightText, IntPoint(windowWidth / 2 + timeSliderWidth / 2 + margin, windowHeight - margin - sliderHeight / 2 + fontHeight / 4));

    // Copy to the window
    BLENDFUNCTION blendFunction = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
    SIZE size = { windowWidth, windowHeight };
    POINT sourcePoint = {0, 0};
    POINT destPoint = { m_hudPosition.x(), m_hudPosition.y() };
    BOOL result = UpdateLayeredWindow(m_hudWindow, 0, &destPoint, &size, bitmapDC.get(), &sourcePoint, 0, &blendFunction, ULW_ALPHA);

    context.restore();

    ::SelectObject(bitmapDC.get(), oldBitmap);
}

// The screen that the popup is placed on should be whichever one the popup menu button lies on.
// We fake an hwnd (here we use the popup's hwnd) on top of the button which we can then use to determine the screen.
// We can then proceed with our final position/size calculations.
void PopupMenuWin::calculatePositionAndSize(const IntRect& r, FrameView* v)
{
    // First get the screen coordinates of the popup menu client.
    HWND hostWindow = v->hostWindow()->platformPageClient();
    IntRect absoluteBounds = ((RenderMenuList*)m_popupClient)->absoluteBoundingBoxRect();
    IntRect absoluteScreenCoords(v->contentsToWindow(absoluteBounds.location()), absoluteBounds.size());
    POINT absoluteLocation(absoluteScreenCoords.location());
    if (!::ClientToScreen(hostWindow, &absoluteLocation))
        return;
    absoluteScreenCoords.setLocation(absoluteLocation);

    // Now set the popup menu's location temporarily to these coordinates so we can determine which screen the popup should lie on.
    // We create or move m_popup as necessary.
    if (!m_popup) {
        registerClass();
        DWORD exStyle = WS_EX_LTRREADING;
        m_popup = ::CreateWindowExW(exStyle, kPopupWindowClassName, L"PopupMenu",
                                    WS_POPUP | WS_BORDER,
                                    absoluteScreenCoords.x(), absoluteScreenCoords.y(), absoluteScreenCoords.width(), absoluteScreenCoords.height(),
                                    hostWindow, 0, WebCore::instanceHandle(), this);

        if (!m_popup)
            return;
    } else
        ::MoveWindow(m_popup, absoluteScreenCoords.x(), absoluteScreenCoords.y(), absoluteScreenCoords.width(), absoluteScreenCoords.height(), false);

    FloatRect screen = monitorFromHwnd(m_popup);

    // Now we determine the actual location and measurements of the popup itself.
    // r is in absolute document coordinates, but we want to be in screen coordinates.

    // First, move to WebView coordinates
    IntRect rScreenCoords(v->contentsToWindow(r.location()), r.size());
    if (Page* page = v->frame().page())
        rScreenCoords.scale(page->deviceScaleFactor());

    // Then, translate to screen coordinates
    POINT location(rScreenCoords.location());
    if (!::ClientToScreen(hostWindow, &location))
        return;

    rScreenCoords.setLocation(location);

    // First, determine the popup's height
    int itemCount = client()->listSize();
    m_itemHeight = client()->menuStyle().font().fontMetrics().height() + optionSpacingMiddle;
    int naturalHeight = m_itemHeight * itemCount;
    int popupHeight = std::min(maxPopupHeight, naturalHeight);
    // The popup should show an integral number of items (i.e. no partial items should be visible)
    popupHeight -= popupHeight % m_itemHeight;

    // Next determine its width
    int popupWidth = 0;
    for (int i = 0; i < itemCount; ++i) {
        String text = client()->itemText(i);
        if (text.isEmpty())
            continue;

        FontCascade itemFont = client()->menuStyle().font();
        if (client()->itemIsLabel(i)) {
            auto d = itemFont.fontDescription();
            d.setWeight(d.bolderWeight());
            itemFont = FontCascade(d, itemFont.letterSpacing(), itemFont.wordSpacing());
            itemFont.update(m_popupClient->fontSelector());
        }

        popupWidth = std::max(popupWidth, static_cast<int>(ceilf(itemFont.width(TextRun(text)))));
    }

    if (naturalHeight > maxPopupHeight)
        // We need room for a scrollbar
        popupWidth += ScrollbarTheme::theme().scrollbarThickness(SmallScrollbar);

    // Add padding to align the popup text with the <select> text
    popupWidth += std::max<int>(0, client()->clientPaddingRight() - client()->clientInsetRight()) + std::max<int>(0, client()->clientPaddingLeft() - client()->clientInsetLeft());

    // Leave room for the border
    popupWidth += 2 * popupWindowBorderWidth;
    popupHeight += 2 * popupWindowBorderWidth;

    // The popup should be at least as wide as the control on the page
    popupWidth = std::max(rScreenCoords.width() - client()->clientInsetLeft() - client()->clientInsetRight(), popupWidth);

    // Always left-align items in the popup.  This matches popup menus on the mac.
    int popupX = rScreenCoords.x() + client()->clientInsetLeft();

    IntRect popupRect(popupX, rScreenCoords.maxY(), popupWidth, popupHeight);

    // Check that we don't go off the screen vertically
    if (popupRect.maxY() > screen.height()) {
        // The popup will go off the screen, so try placing it above the client
        if (rScreenCoords.y() - popupRect.height() < 0) {
            // The popup won't fit above, either, so place it whereever's bigger and resize it to fit
            if ((rScreenCoords.y() + rScreenCoords.height() / 2) < (screen.height() / 2)) {
                // Below is bigger
                popupRect.setHeight(screen.height() - popupRect.y());
            } else {
//.........这里部分代码省略.........