Add support for line spacing in Text element.

This change adds the lineHeight and lineHeightMode properties.

Task-number: QTBUG-14296
Reviewed-by: Martin Jones

2 files changed, 19 insertions, 3 deletions

diff --git a/src/gui/text/qtextdocumentlayout.cpp b/src/gui/text/qtextdocumentlayout.cpp
index d721c91..c1c3768 100644
--- a/src/gui/text/qtextdocumentlayout.cpp
+++ b/src/gui/text/qtextdocumentlayout.cpp
@@ -513,6 +513,9 @@ public:
 
     qreal scaleToDevice(qreal value) const;
     QFixed scaleToDevice(QFixed value) const;
+
+    qreal lineH;
+    QTextDocumentLayout::LineHeightMode lineHeightMode;
 };
 
 QTextDocumentLayoutPrivate::QTextDocumentLayoutPrivate()
@@ -520,7 +523,9 @@ QTextDocumentLayoutPrivate::QTextDocumentLayoutPrivate()
       cursorWidth(1),
       currentLazyLayoutPosition(-1),
       lazyLayoutStepSize(1000),
-      lastPageCount(-1)
+      lastPageCount(-1),
+      lineH(1),
+      lineHeightMode(QTextDocumentLayout::MultiplyHeight)
 {
     showLayoutProgress = true;
     insideDocumentChange = false;
@@ -2639,7 +2644,8 @@ void QTextDocumentLayoutPrivate::layoutBlock(const QTextBlock &bl, int blockPosi
 
             }
 
-            QFixed lineHeight = QFixed::fromReal(line.height());
+            QFixed lineHeight = (lineHeightMode == QTextDocumentLayout::PixelHeight) ? QFixed::fromReal(lineH) : QFixed::fromReal(line.height() * lineH);
+
             if (layoutStruct->pageHeight > 0 && layoutStruct->absoluteY() + lineHeight > layoutStruct->pageBottom) {
                 layoutStruct->newPage();
 
@@ -2714,6 +2720,13 @@ void QTextDocumentLayoutPrivate::layoutBlock(const QTextBlock &bl, int blockPosi
     }
 }
 
+void QTextDocumentLayout::setLineHeight(qreal lineH, QTextDocumentLayout::LineHeightMode mode = QTextDocumentLayout::MultiplyHeight)
+{
+    Q_D(QTextDocumentLayout);
+    d->lineH = lineH;
+    d->lineHeightMode = mode;
+}
+
 void QTextDocumentLayoutPrivate::floatMargins(const QFixed &y, const QTextLayoutStruct *layoutStruct,
                                               QFixed *left, QFixed *right) const
 {
diff --git a/src/gui/text/qtextdocumentlayout_p.h b/src/gui/text/qtextdocumentlayout_p.h
index 3c0383c..efc408b 100644
--- a/src/gui/text/qtextdocumentlayout_p.h
+++ b/src/gui/text/qtextdocumentlayout_p.h
@@ -63,7 +63,7 @@ class QTextListFormat;
 
 class QTextDocumentLayoutPrivate;
 
-class Q_AUTOTEST_EXPORT QTextDocumentLayout : public QAbstractTextDocumentLayout
+class Q_GUI_EXPORT QTextDocumentLayout : public QAbstractTextDocumentLayout
 {
     Q_DECLARE_PRIVATE(QTextDocumentLayout)
     Q_OBJECT
@@ -109,6 +109,9 @@ protected:
     void drawInlineObject(QPainter *p, const QRectF &rect, QTextInlineObject item,
                           int posInDocument, const QTextFormat &format);
     virtual void timerEvent(QTimerEvent *e);
+    enum LineHeightMode { MultiplyHeight, PixelHeight };
+    void setLineHeight(qreal lineHeight, QTextDocumentLayout::LineHeightMode mode);
+
 private:
     QRectF doLayout(int from, int oldLength, int length);
     void layoutFinished();