Add support for baseline anchoring.

7 files changed, 80 insertions, 40 deletions

diff --git a/src/declarative/fx/qfxanchors.cpp b/src/declarative/fx/qfxanchors.cpp
index 235511f..681a9fa 100644
--- a/src/declarative/fx/qfxanchors.cpp
+++ b/src/declarative/fx/qfxanchors.cpp
@@ -146,6 +146,7 @@ QFxAnchors::~QFxAnchors()
     d->remDepend(d->bottom.item);
     d->remDepend(d->vCenter.item);
     d->remDepend(d->hCenter.item);
+    d->remDepend(d->baseline.item);
 }
 
 void QFxAnchorsPrivate::fillChanged()
@@ -210,6 +211,10 @@ void QFxAnchorsPrivate::clearItem(QFxItem *item)
         hCenter.item = 0;
         usedAnchors &= ~QFxAnchors::HasHCenterAnchor;
     }
+    if (baseline.item == item) {
+        baseline.item = 0;
+        usedAnchors &= ~QFxAnchors::HasBaselineAnchor;
+    }
 }
 
 void QFxAnchorsPrivate::addDepend(QFxItem *item)
@@ -430,8 +435,6 @@ void QFxAnchorsPrivate::updateVerticalAnchors()
             } else if (bottom.item->itemParent() == item->itemParent()) {
                 setItemY(position(bottom.item, bottom.anchorLine) - item->height() - bottomMargin);
             }
-
-
         } else if (usedAnchors & QFxAnchors::HasVCenterAnchor) {
             //(stetching handled above)
 
@@ -442,6 +445,11 @@ void QFxAnchorsPrivate::updateVerticalAnchors()
             } else if (vCenter.item->itemParent() == item->itemParent()) {
                 setItemY(position(vCenter.item, vCenter.anchorLine) - item->height()/2 + vCenterOffset);
             }
+        } else if (usedAnchors & QFxAnchors::HasBaselineAnchor) {
+            //Handle baseline
+            if (baseline.item->itemParent() == item->itemParent()) {
+                setItemY(position(baseline.item, baseline.anchorLine) - item->baselineOffset());
+            }
         }
         updatingVerticalAnchor = false;
     } else {
@@ -599,6 +607,36 @@ void QFxAnchors::resetVerticalCenter()
     setVerticalCenter(QFxAnchorLine());
 }
 
+QFxAnchorLine QFxAnchors::baseline() const
+{
+    Q_D(const QFxAnchors);
+    return d->baseline;
+}
+
+void QFxAnchors::setBaseline(const QFxAnchorLine &edge)
+{
+    Q_D(QFxAnchors);
+    if (!d->checkVAnchorValid(edge))
+        return;
+
+    if (edge.item)
+        d->usedAnchors |= HasBaselineAnchor;
+    else
+        d->usedAnchors &= ~HasBaselineAnchor;
+
+    d->checkVValid();
+
+    d->remDepend(d->baseline.item);
+    d->baseline = edge;
+    d->addDepend(d->baseline.item);
+    d->updateVerticalAnchors();
+}
+
+void QFxAnchors::resetBaseline()
+{
+    setBaseline(QFxAnchorLine());
+}
+
 QFxAnchorLine QFxAnchors::left() const
 {
     Q_D(const QFxAnchors);
@@ -797,7 +835,7 @@ bool QFxAnchorsPrivate::checkHValid() const
     if (usedAnchors & QFxAnchors::HasLeftAnchor &&
         usedAnchors & QFxAnchors::HasRightAnchor &&
         usedAnchors & QFxAnchors::HasHCenterAnchor) {
-        qmlInfo(item) << "Can't specify left, right, and hcenter anchors";
+        qmlInfo(item) << "Can't specify left, right, and hcenter anchors.";
         return false;
     }
 
@@ -822,7 +860,13 @@ bool QFxAnchorsPrivate::checkVValid() const
     if (usedAnchors & QFxAnchors::HasTopAnchor &&
         usedAnchors & QFxAnchors::HasBottomAnchor &&
         usedAnchors & QFxAnchors::HasVCenterAnchor) {
-        qmlInfo(item) << "Can't specify top, bottom, and vcenter anchors";
+        qmlInfo(item) << "Can't specify top, bottom, and vcenter anchors.";
+        return false;
+    } else if (usedAnchors & QFxAnchors::HasBaselineAnchor &&
+               (usedAnchors & QFxAnchors::HasTopAnchor ||
+                usedAnchors & QFxAnchors::HasBottomAnchor ||
+                usedAnchors & QFxAnchors::HasVCenterAnchor)) {
+        qmlInfo(item) << "Baseline anchor can't be used in conjunction with top, bottom, or vcenter anchors.";
         return false;
     }
 
diff --git a/src/declarative/fx/qfxanchors.h b/src/declarative/fx/qfxanchors.h
index 9d776ab..3f142c4 100644
--- a/src/declarative/fx/qfxanchors.h
+++ b/src/declarative/fx/qfxanchors.h
@@ -91,6 +91,7 @@ class Q_DECLARATIVE_EXPORT QFxAnchors : public QObject
     Q_PROPERTY(QFxAnchorLine top READ top WRITE setTop RESET resetTop);
     Q_PROPERTY(QFxAnchorLine bottom READ bottom WRITE setBottom RESET resetBottom);
     Q_PROPERTY(QFxAnchorLine verticalCenter READ verticalCenter WRITE setVerticalCenter RESET resetVerticalCenter);
+    Q_PROPERTY(QFxAnchorLine baseline READ baseline WRITE setBaseline RESET resetBaseline);
     Q_PROPERTY(int leftMargin READ leftMargin WRITE setLeftMargin NOTIFY leftMarginChanged);
     Q_PROPERTY(int rightMargin READ rightMargin WRITE setRightMargin NOTIFY rightMarginChanged);
     Q_PROPERTY(int horizontalCenterOffset READ horizontalCenterOffset WRITE setHorizontalCenterOffset NOTIFY horizontalCenterOffsetChanged());
@@ -141,6 +142,10 @@ public:
     void setVerticalCenter(const QFxAnchorLine &edge);
     void resetVerticalCenter();
 
+    QFxAnchorLine baseline() const;
+    void setBaseline(const QFxAnchorLine &edge);
+    void resetBaseline();
+
     int leftMargin() const;
     void setLeftMargin(int);
 
diff --git a/src/declarative/fx/qfxanchors_p.h b/src/declarative/fx/qfxanchors_p.h
index b90380a..32d8b75 100644
--- a/src/declarative/fx/qfxanchors_p.h
+++ b/src/declarative/fx/qfxanchors_p.h
@@ -117,6 +117,7 @@ public:
     QFxAnchorLine bottom;
     QFxAnchorLine vCenter;
     QFxAnchorLine hCenter;
+    QFxAnchorLine baseline;
 
     int leftMargin;
     int rightMargin;
diff --git a/src/declarative/fx/qfxitem.cpp b/src/declarative/fx/qfxitem.cpp
index 3cbcd6a..561a124 100644
--- a/src/declarative/fx/qfxitem.cpp
+++ b/src/declarative/fx/qfxitem.cpp
@@ -259,24 +259,10 @@ void QFxContents::setItem(QFxItem *item)
 */
 
 /*!
-    \fn void QFxItem::baselineChanged()
-
-    This signal is emitted when the baseline of the item changes. 
-
-    The baseline may change in response to a change to the baselineOffset
-    property or due to the geometry of the item changing.
-*/
-
-/*!
     \fn void QFxItem::baselineOffsetChanged()
 
-    This signal is emitted when the baseline of the item is changed
-    via the baselineOffset property.
-
-    The baseline corresponds to the baseline of the text contained in
-    the item.  It is useful for aligning the text in items placed
-    beside each other.  The default baseline is positioned at
-    2/3 of the height of the item.
+    This signal is emitted when the baseline offset of the item
+    is changed.
 */
 
 /*!
@@ -286,24 +272,12 @@ void QFxContents::setItem(QFxItem *item)
 */
 
 /*!
-    \fn void QFxItem::rightChanged()
-
-    This signal is emitted when the right coordinate of the item changes.
-*/
-
-/*!
     \fn void QFxItem::topChanged()
 
     This signal is emitted when the top coordinate of the item changes.
 */
 
 /*!
-    \fn void QFxItem::bottomChanged()
-
-    This signal is emitted when the bottom coordinate of the item changes.
-*/
-
-/*!
     \fn void QFxItem::widthChanged()
 
     This signal is emitted when the width of the item changes.
@@ -1282,6 +1256,15 @@ QFxAnchorLine QFxItem::verticalCenter() const
 }
 
 /*!
+    \internal
+*/
+QFxAnchorLine QFxItem::baseline() const
+{
+    Q_D(const QFxItem);
+    return d->anchorLines()->baseline;
+}
+
+/*!
   \property QFxItem::top
 
   One of the anchor lines of the item.
@@ -1336,6 +1319,7 @@ QFxAnchorLine QFxItem::verticalCenter() const
   \qmlproperty AnchorLine Item::right
   \qmlproperty AnchorLine Item::horizontalCenter
   \qmlproperty AnchorLine Item::verticalCenter
+  \qmlproperty AnchorLine Item::baseline
 
   The anchor lines of the item.
 
@@ -1349,6 +1333,7 @@ QFxAnchorLine QFxItem::verticalCenter() const
   \qmlproperty AnchorLine Item::anchors.right
   \qmlproperty AnchorLine Item::anchors.horizontalCenter
   \qmlproperty AnchorLine Item::anchors.verticalCenter
+  \qmlproperty AnchorLine Item::anchors.baseline
 
   \qmlproperty Item Item::anchors.fill
 
@@ -1408,20 +1393,19 @@ QFxAnchorLine QFxItem::verticalCenter() const
 
 /*!
   \property QFxItem::baselineOffset
-  \brief The position of the item's baseline in global (scene) coordinates.
+  \brief The position of the item's baseline in local coordinates.
 
   The baseline of a Text item is the imaginary line on which the text
   sits. Controls containing text usually set their baseline to the
   baseline of their text.
 
-  For non-text items, a default baseline offset of two-thirds of the
-  item's height is used to determine the baseline.
+  For non-text items, a default baseline offset of 0 is used.
 */
 int QFxItem::baselineOffset() const
 {
     Q_D(const QFxItem);
     if (!d->_baselineOffset.isValid()) {
-        return height()*2/3;    //### default baseline is 2/3 of the way to the bottom of the item
+        return 0;
     } else
         return d->_baselineOffset;
 }
@@ -1437,6 +1421,11 @@ void QFxItem::setBaselineOffset(int offset)
 
     d->_baselineOffset = offset;
     emit baselineOffsetChanged();
+
+    for(int ii = 0; ii < d->dependantAnchors.count(); ++ii) {
+        QFxAnchors *anchor = d->dependantAnchors.at(ii);
+        anchor->d_func()->updateVerticalAnchors();
+    }
 }
 
 /*!
@@ -2100,6 +2089,8 @@ QFxItemPrivate::AnchorLines::AnchorLines(QFxItem *q)
     bottom.anchorLine = QFxAnchorLine::Bottom;
     vCenter.item = q;
     vCenter.anchorLine = QFxAnchorLine::VCenter;
+    baseline.item = q;
+    baseline.anchorLine = QFxAnchorLine::Baseline;
 }
 
 QT_END_NAMESPACE
diff --git a/src/declarative/fx/qfxitem.h b/src/declarative/fx/qfxitem.h
index d34a9fb..0b4f897 100644
--- a/src/declarative/fx/qfxitem.h
+++ b/src/declarative/fx/qfxitem.h
@@ -127,6 +127,7 @@ class Q_DECLARATIVE_EXPORT QFxItem : public QSimpleCanvasItem, public QmlParserS
     Q_PROPERTY(QFxAnchorLine top READ top)
     Q_PROPERTY(QFxAnchorLine bottom READ bottom)
     Q_PROPERTY(QFxAnchorLine verticalCenter READ verticalCenter)
+    Q_PROPERTY(QFxAnchorLine baseline READ baseline)
     Q_PROPERTY(qreal rotation READ rotation WRITE setRotation NOTIFY rotationChanged)
     Q_PROPERTY(qreal scale READ scale WRITE setScale NOTIFY scaleChanged)
     Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity NOTIFY opacityChanged)
@@ -258,6 +259,7 @@ private:
     QFxAnchorLine top() const;
     QFxAnchorLine bottom() const;
     QFxAnchorLine verticalCenter() const;
+    QFxAnchorLine baseline() const;
 
     void init(QFxItem *parent);
     friend class QmlStatePrivate;
diff --git a/src/declarative/fx/qfxitem_p.h b/src/declarative/fx/qfxitem_p.h
index 85ce171..b5f9554 100644
--- a/src/declarative/fx/qfxitem_p.h
+++ b/src/declarative/fx/qfxitem_p.h
@@ -157,6 +157,7 @@ public:
         QFxAnchorLine top;
         QFxAnchorLine bottom;
         QFxAnchorLine vCenter;
+        QFxAnchorLine baseline;
     };
     mutable AnchorLines *_anchorLines;
     AnchorLines *anchorLines() const {
diff --git a/src/declarative/fx/qfxtext.cpp b/src/declarative/fx/qfxtext.cpp
index e84255d..2542413 100644
--- a/src/declarative/fx/qfxtext.cpp
+++ b/src/declarative/fx/qfxtext.cpp
@@ -571,7 +571,6 @@ QSize QFxTextPrivate::setupTextLayout(QTextLayout *layout)
     QFont f; if (_font) f = _font->font();
     QFontMetrics fm = QFontMetrics(f);
 
-    int leading = fm.leading();
     int height = 0;
     qreal widthUsed = 0;
     qreal lineWidth = 0;
@@ -592,9 +591,6 @@ QSize QFxTextPrivate::setupTextLayout(QTextLayout *layout)
     }
     layout->endLayout();
 
-    if (layout->lineCount() == 1)
-        height -= leading;
-
     for (int i = 0; i < layout->lineCount(); ++i) {
         QTextLine line = layout->lineAt(i);
         widthUsed = qMax(widthUsed, line.naturalTextWidth());