如何获取 QTextTableCell 的边界框

Question

我正在使用 QTextDocument 并需要进行一些自定义命中测试，为此我需要找到 QTextTableCell 的边界框但找不到任何方法来解决它。有人可以就我应该如何获得它提出一些建议或任何想法。

Answer 1

我发现在不对 Qt 代码进行任何更改的情况下无论如何都无法做到这一点，这是我必须做的事情的不同之处。


    ==== //local/qt5/qtbase/src/gui/text/qabstracttextdocumentlayout.h#2 (text) ====

    @@ -92,6 +92,11 @@
         virtual QRectF frameBoundingRect(QTextFrame *frame) const = 0;
         virtual QRectF blockBoundingRect(const QTextBlock &block) const = 0;

    +    virtual QRectF cellBoundingRect(QTextTable &table, const QTextTableCell &cell) const
    +    {
    +        return QRectF();
    +    }
    +
         void setPaintDevice(QPaintDevice *device);
         QPaintDevice *paintDevice() const;


    ==== //local/qt5/qtbase/src/gui/text/qtextdocumentlayout.cpp#3 (text) ====

    @@ -3201,6 +3201,17 @@
         return QRectF(pos, data(table)->size.toSizeF());
     }

    +QRectF QTextDocumentLayout::cellBoundingRect( QTextTable &table, const QTextTableCell &cell) const
    +{
    +    Q_D(const QTextDocumentLayout);
    +    if (d->docPrivate->pageSize.isNull())
    +        return QRectF();
    +    d->ensureLayoutFinished();
    +    QTextTableData *td = static_cast(data(&table));
    +    QRectF cellRect = td->cellRect(cell);
    +    return cellRect;
    +}
    +
     QRectF QTextDocumentLayout::frameBoundingRect(QTextFrame *frame) const
     {
         Q_D(const QTextDocumentLayout);

    ==== //local/qt5/qtbase/src/gui/text/qtextdocumentlayout_p.h#1 (text) ====

    @@ -104,6 +104,8 @@

         bool contentHasAlignment() const;

    +    virtual QRectF cellBoundingRect(QTextTable &table, const QTextTableCell &cell) const;
    +
     protected:
         void documentChanged(int from, int oldLength, int length);
         void resizeInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format);

Answer 2

实际上有一种方法可以获得单元格的矩形。您需要遍历单元格内容并加入这些区域。最后添加单元格的填充。这是一个工作示例。但如果您的单元格包含嵌套框架或跨多行的单元格，您可能必须扩展它。

QRectF cellBounds(QTextEdit& edit, QTextTable& table, QTextTableCell& cell, bool rowCheck = true) {
    QTextTableFormat tableFormat = table.format();
    qreal cellExtra = tableFormat.cellPadding() /* + tableFormat.border()*/;
    int vOffset = edit.verticalScrollBar()->value();
    QTextBlock next = cell.firstCursorPosition().block();
    QTextBlock last = cell.lastCursorPosition().block();
    QAbstractTextDocumentLayout* layout = edit.document()->documentLayout();
    QRectF bounds;
    while (next.isValid()) {
        bounds = bounds.isNull() ? layout->blockBoundingRect(next) : bounds.united(layout->blockBoundingRect(next));
        if (next == last) {
            break;
        }
        next = next.next();
    }
    if (!bounds.isNull()) {
        bounds.adjust(-cellExtra, -cellExtra, cellExtra, cellExtra);
        bounds.translate(0, -vOffset);
        if(rowCheck) {
            for(int col = 0; col < table.columns(); col++) {
                if(col != cell.column()) {
                    QTextTableCell nextCell = table.cellAt(cell.row(), col);
                    QRectF nextBounds = cellBounds(edit, table, nextCell, false);
                    if(nextBounds.height() > bounds.height())
                        bounds.setHeight(nextBounds.height());
                }
            }
        }
    }
    return bounds;
}

如何获取 QTextTableCell 的边界框

How to get boundingBox of a QTextTableCell

qt4