1 files changed, 111 insertions, 0 deletions
diff --git a/cervisia/tooltip.cpp b/cervisia/tooltip.cpp
new file mode 100644
index 00000000..7debf9d7
--- /dev/null
+++ b/cervisia/tooltip.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2004-2007 André Wöbbeking <Woebbeking@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include "tooltip.h"
+
+#include <kglobal.h>
+#include <kglobalsettings.h>
+
+#include <qsimplerichtext.h>
+
+
+namespace Cervisia
+{
+
+
+static QString truncateLines(const QString&, const QFontMetrics&, const QSize&);
+static QString truncateLines(const QString&, const QFont&, const QPoint&, const QRect&);
+
+
+ToolTip::ToolTip(QWidget* widget)
+    : QObject(widget), QToolTip(widget)
+{
+}
+
+
+void ToolTip::maybeTip(const QPoint& pos)
+{
+    QRect rect;
+    QString text;
+    emit queryToolTip(pos, rect, text);
+
+    if (rect.isValid() && !text.isEmpty())
+    {
+        text = truncateLines(text,
+                             font(),
+                             parentWidget()->mapToGlobal(pos),
+                             KGlobalSettings::desktopGeometry(parentWidget()));
+        tip(rect, text);
+    }
+}
+
+
+// Primtive routine to truncate the text. size.width() is ignored, only
+// size.height() is used at the moment to keep it fast. It doesn't work
+// correct if text lines have different heights.
+QString truncateLines(const QString&      text,
+                      const QFontMetrics& fm,
+                      const QSize&        size)
+{
+    const QChar newLine('\n');
+
+    const int lineSpacing(fm.lineSpacing());
+    const int numberOfLines(text.contains(newLine) + 1);
+    const int maxNumberOfLines(size.height() / lineSpacing);
+
+    if (numberOfLines <= maxNumberOfLines)
+        return text;
+
+    const QChar* unicode(text.unicode());
+    for (int count(maxNumberOfLines); count; ++unicode)
+        if (*unicode == newLine)
+            --count;
+
+    return text.left(unicode - text.unicode() - 1);
+}
+
+
+// Truncate the tooltip's text if necessary
+QString truncateLines(const QString& text,
+                      const QFont&   font,
+                      const QPoint&  globalPos,
+                      const QRect&   desktopGeometry)
+{
+    // maximum size of the tooltip, - 10 just to be safe
+    const int maxWidth(kMax(desktopGeometry.width() - globalPos.x(), globalPos.x())
+                       - desktopGeometry.left() - 10);
+    const int maxHeight(kMax(desktopGeometry.height() - globalPos.y(), globalPos.y())
+                       - desktopGeometry.top() - 10);
+
+    // calculate the tooltip's size
+    const QSimpleRichText layoutedText(text, font);
+
+    // only if the tooltip's size is bigger in x- and y-direction the text must
+    // be truncated otherwise the tip is moved to a position where it fits
+    return  ((layoutedText.widthUsed() > maxWidth)
+             && (layoutedText.height() > maxHeight))
+        ? truncateLines(text, QFontMetrics(font), QSize(maxWidth, maxHeight))
+        : text;
+}
+
+
+} // namespace Cervisia
+
+
+#include "tooltip.moc"