Elide has unexpected effect on Text's implicitWidth

The elided string was used to calculate the implicitWidth rather than
the full string.

Change-Id: I51b8800b47d4e32f4d5eef07c71df10e2df905b7
Task-number: QTBUG-18627
Reviewed-by: Michael Brasser

4 files changed, 33 insertions, 5 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativetext.cpp b/src/declarative/graphicsitems/qdeclarativetext.cpp
index 720692c..1d51840 100644
--- a/src/declarative/graphicsitems/qdeclarativetext.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetext.cpp
@@ -101,7 +101,8 @@ QDeclarativeTextPrivate::QDeclarativeTextPrivate()
   format(QDeclarativeText::AutoText), wrapMode(QDeclarativeText::NoWrap), lineHeight(1),
   lineHeightMode(QDeclarativeText::ProportionalHeight), lineCount(1), truncated(false), maximumLineCount(INT_MAX),
   maximumLineCountValid(false), imageCacheDirty(true), updateOnComponentComplete(true), richText(false), singleline(false),
-  cacheAllTextAsImage(true), internalWidthUpdate(false), requireImplicitWidth(false),  hAlignImplicit(true), rightToLeftText(false), naturalWidth(0), doc(0)
+  cacheAllTextAsImage(true), internalWidthUpdate(false), requireImplicitWidth(false),  hAlignImplicit(true),
+  rightToLeftText(false), layoutTextElided(false), naturalWidth(0), doc(0)
 {
     cacheAllTextAsImage = enableImageCache();
     QGraphicsItemPrivate::acceptedMouseButtons = Qt::LeftButton;
@@ -217,6 +218,7 @@ void QDeclarativeTextPrivate::updateLayout()
         return;
     }
 
+    layoutTextElided = false;
     // Setup instance of QTextLayout for all cases other than richtext
     if (!richText) {
         layout.clearLayout();
@@ -227,10 +229,13 @@ void QDeclarativeTextPrivate::updateLayout()
             singleline = !tmp.contains(QChar::LineSeparator);
             if (singleline && !maximumLineCountValid && elideMode != QDeclarativeText::ElideNone && q->widthValid()) {
                 QFontMetrics fm(font);
-                tmp = fm.elidedText(tmp,(Qt::TextElideMode)elideMode,q->width()); // XXX still worth layout...?
-                if (tmp != text && !truncated) {
-                    truncated = true;
-                    emit q->truncatedChanged();
+                tmp = fm.elidedText(tmp,(Qt::TextElideMode)elideMode,q->width());
+                if (tmp != text) {
+                    layoutTextElided = true;
+                    if (!truncated) {
+                        truncated = true;
+                        emit q->truncatedChanged();
+                    }
                 }
             }
             layout.setText(tmp);
@@ -377,6 +382,12 @@ QRect QDeclarativeTextPrivate::setupTextLayout()
 
     if (requireImplicitWidth && q->widthValid()) {
         // requires an extra layout
+        QString elidedText;
+        if (layoutTextElided) {
+            // We have provided elided text to the layout, but we must calculate unelided width.
+            elidedText = layout.text();
+            layout.setText(text);
+        }
         layout.beginLayout();
         forever {
             QTextLine line = layout.createLine();
@@ -390,6 +401,8 @@ QRect QDeclarativeTextPrivate::setupTextLayout()
             br = br.united(line.naturalTextRect());
         }
         naturalWidth = br.width();
+        if (layoutTextElided)
+            layout.setText(elidedText);
     }
 
     if (maximumLineCountValid) {
diff --git a/src/declarative/graphicsitems/qdeclarativetext_p_p.h b/src/declarative/graphicsitems/qdeclarativetext_p_p.h
index e3ab62a..6a3d581 100644
--- a/src/declarative/graphicsitems/qdeclarativetext_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetext_p_p.h
@@ -116,6 +116,7 @@ public:
     bool requireImplicitWidth:1;
     bool hAlignImplicit:1;
     bool rightToLeftText:1;
+    bool layoutTextElided:1;
 
     QRect layedOutTextRect;
     QSize paintedSize;
diff --git a/tests/auto/declarative/qdeclarativetext/data/elideimplicitwidth.qml b/tests/auto/declarative/qdeclarativetext/data/elideimplicitwidth.qml
new file mode 100644
index 0000000..60ae15c
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativetext/data/elideimplicitwidth.qml
@@ -0,0 +1,7 @@
+import QtQuick 1.1
+
+Text {
+    text: "Hello World"
+    elide: Text.ElideRight
+    width: 30
+}
diff --git a/tests/auto/declarative/qdeclarativetext/tst_qdeclarativetext.cpp b/tests/auto/declarative/qdeclarativetext/tst_qdeclarativetext.cpp
index ca6e87a..82b6f73 100644
--- a/tests/auto/declarative/qdeclarativetext/tst_qdeclarativetext.cpp
+++ b/tests/auto/declarative/qdeclarativetext/tst_qdeclarativetext.cpp
@@ -390,6 +390,13 @@ void tst_qdeclarativetext::elide()
             QCOMPARE(textObject->width(), 100.);
         }
     }
+
+    // QTBUG-18627
+    QUrl qmlfile = QUrl::fromLocalFile(SRCDIR "/data/elideimplicitwidth.qml");
+    QDeclarativeComponent textComponent(&engine, qmlfile);
+    QDeclarativeItem *item = qobject_cast<QDeclarativeItem*>(textComponent.create());
+    QVERIFY(item != 0);
+    QVERIFY(item->implicitWidth() > item->width());
 }
 
 void tst_qdeclarativetext::textFormat()