C++ (Cpp) InlineTextBox::logicalLeft示例

示例#1

static bool lineDirectionPointFitsInBox(int pointLineDirection, const InlineTextBox& box, ShouldAffinityBeDownstream& shouldAffinityBeDownstream)
{
    shouldAffinityBeDownstream = AlwaysDownstream;

    // the x coordinate is equal to the left edge of this box
    // the affinity must be downstream so the position doesn't jump back to the previous line
    // except when box is the first box in the line
    if (pointLineDirection <= box.logicalLeft()) {
        shouldAffinityBeDownstream = !box.prevLeafChild() ? UpstreamIfPositionIsNotAtStart : AlwaysDownstream;
        return true;
    }

#if !PLATFORM(IOS)
    // and the x coordinate is to the left of the right edge of this box
    // check to see if position goes in this box
    if (pointLineDirection < box.logicalRight()) {
        shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart;
        return true;
    }
#endif

    // box is first on line
    // and the x coordinate is to the left of the first text box left edge
    if (!box.prevLeafChildIgnoringLineBreak() && pointLineDirection < box.logicalLeft())
        return true;

    if (!box.nextLeafChildIgnoringLineBreak()) {
        // box is last on line
        // and the x coordinate is to the right of the last text box right edge
        // generate VisiblePosition, use UPSTREAM affinity if possible
        shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart;
        return true;
    }

    return false;
}