Fix Bug 287983 - Dolphin truncates tooltip information for long file names

Use KStringHandler and QTextLayout to wrap the text (file name)
into the maximum width of the label "name".

Make use of QFontMetrics to calculate a font size aware tooltip size.

BUG: 287983
FIXED-IN: 4.11.3
REVIEW: 113101

1 files changed, 36 insertions, 1 deletions

diff --git a/src/views/tooltips/filemetadatatooltip.cpp b/src/views/tooltips/filemetadatatooltip.cpp
index c22f6be5d..67911eea2 100644
--- a/src/views/tooltips/filemetadatatooltip.cpp
+++ b/src/views/tooltips/filemetadatatooltip.cpp
@@ -24,11 +24,15 @@
 #include <KColorScheme>
 #include <KSeparator>
 #include <KWindowSystem>
+#include <KStringHandler>
 
 #include <QLabel>
 #include <QStyleOptionFrame>
 #include <QStylePainter>
 #include <QVBoxLayout>
+#include <QTextDocument>
+#include <QTextLayout>
+#include <QTextLine>
 
 #ifndef HAVE_NEPOMUK
 #include <KFileMetaDataWidget>
@@ -56,10 +60,15 @@ FileMetaDataToolTip::FileMetaDataToolTip(QWidget* parent) :
     m_name = new QLabel(this);
     m_name->setForegroundRole(QPalette::ToolTipText);
     m_name->setTextFormat(Qt::PlainText);
+    m_name->setAlignment(Qt::AlignHCenter);
+
     QFont font = m_name->font();
     font.setBold(true);
     m_name->setFont(font);
 
+    QFontMetrics fontMetrics(font);
+    m_name->setMaximumWidth(fontMetrics.averageCharWidth() * 40);
+
     // Create widget for the meta data
 #ifndef HAVE_NEPOMUK
     m_fileMetaDataWidget = new KFileMetaDataWidget(this);
@@ -108,7 +117,33 @@ QPixmap FileMetaDataToolTip::preview() const
 
 void FileMetaDataToolTip::setName(const QString& name)
 {
-    m_name->setText(name);
+    QTextOption textOption;
+    textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
+
+    const QString processedName = Qt::mightBeRichText(name) ? name : KStringHandler::preProcessWrap(name);
+
+    QTextLayout textLayout(processedName);
+    textLayout.setFont(m_name->font());
+    textLayout.setTextOption(textOption);
+
+    QString wrappedText;
+    wrappedText.reserve(processedName.length());
+
+    // wrap the text to fit into the maximum width of m_name
+    textLayout.beginLayout();
+    QTextLine line = textLayout.createLine();
+    while (line.isValid()) {
+        line.setLineWidth(m_name->maximumWidth());
+        wrappedText += processedName.mid(line.textStart(), line.textLength());
+
+        line = textLayout.createLine();
+        if (line.isValid()) {
+            wrappedText += QChar::LineSeparator;
+        }
+    }
+    textLayout.endLayout();
+
+    m_name->setText(wrappedText);
 }
 
 QString FileMetaDataToolTip::name() const