Add some enablers to QTextDocumentLayout

Required to access internals used in the layout process, so that
we can present the layout in the scenegraph. For instance, the
frameBoundingRect() for tables will be the internal bounding rect
of the cells. To avoid regressions, I've added a separate function
for the outer bounding rect. For now, this is private API, but if
it turns out to be useful, the functions can easily be added as
virtual to QAbstractTextDocumentLayout.

Task-number: QTBUG-20917
Change-Id: I04e07d3850b21f9f0704bf8c8a3ffe97ee5c3fda
Reviewed-on: http://codereview.qt-project.org/5539
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jiang Jiang <jiang.jiang@nokia.com>

2 files changed, 43 insertions, 1 deletions

diff --git a/src/gui/text/qtextdocumentlayout.cpp b/src/gui/text/qtextdocumentlayout.cpp
index 04bdfa8d30..5138aa3e70 100644
--- a/src/gui/text/qtextdocumentlayout.cpp
+++ b/src/gui/text/qtextdocumentlayout.cpp
@@ -3136,6 +3136,46 @@ void QTextDocumentLayout::setFixedColumnWidth(int width)
     d->fixedColumnWidth = width;
 }
 
+QRectF QTextDocumentLayout::tableCellBoundingRect(QTextTable *table, const QTextTableCell &cell) const
+{
+    if (!cell.isValid())
+        return QRectF();
+
+    QTextTableData *td = static_cast<QTextTableData *>(data(table));
+
+    QRectF tableRect = tableBoundingRect(table);
+    QRectF cellRect = td->cellRect(cell);
+
+    return cellRect.translated(tableRect.topLeft());
+}
+
+QRectF QTextDocumentLayout::tableBoundingRect(QTextTable *table) const
+{
+    Q_D(const QTextDocumentLayout);
+    if (d->docPrivate->pageSize.isNull())
+        return QRectF();
+    d->ensureLayoutFinished();
+
+    QPointF pos;
+    const int framePos = table->firstPosition();
+    QTextFrame *f = table;
+    while (f) {
+        QTextFrameData *fd = data(f);
+        pos += fd->position.toPointF();
+
+        if (f != table) {
+            if (QTextTable *table = qobject_cast<QTextTable *>(f)) {
+                QTextTableCell cell = table->cellAt(framePos);
+                if (cell.isValid())
+                    pos += static_cast<QTextTableData *>(fd)->cellPosition(cell).toPointF();
+            }
+        }
+
+        f = f->parentFrame();
+    }
+    return QRectF(pos, data(table)->size.toSizeF());
+}
+
 QRectF QTextDocumentLayout::frameBoundingRect(QTextFrame *frame) const
 {
     Q_D(const QTextDocumentLayout);
diff --git a/src/gui/text/qtextdocumentlayout_p.h b/src/gui/text/qtextdocumentlayout_p.h
index b103d886be..bef4c844f6 100644
--- a/src/gui/text/qtextdocumentlayout_p.h
+++ b/src/gui/text/qtextdocumentlayout_p.h
@@ -60,7 +60,7 @@
 QT_BEGIN_NAMESPACE
 
 class QTextListFormat;
-
+class QTextTableCell;
 class QTextDocumentLayoutPrivate;
 
 class Q_GUI_EXPORT QTextDocumentLayout : public QAbstractTextDocumentLayout
@@ -91,6 +91,8 @@ public:
 
     virtual QRectF frameBoundingRect(QTextFrame *frame) const;
     virtual QRectF blockBoundingRect(const QTextBlock &block) const;
+    QRectF tableBoundingRect(QTextTable *table) const;
+    QRectF tableCellBoundingRect(QTextTable *table, const QTextTableCell &cell) const;
 
     // ####
     int layoutStatus() const;