comparison base/TextAbbrev.h @ 286:20097c32d15d

* Better abbreviation modes for layer names in pane (and input model combo
  of plugin parameter dialog)
* Avoid crash when loading SV file containing model derived from nonexistent
  model (shouldn't happen of course, but see bug #1771769)
* Remember last-used input model in plugin parameter dialog
* Don't override a layer colour loaded from a session file with the generated
  default colour when attaching it to a view

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006-2007 Chris Cannam and QMUL.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _TEXT_ABBREV_H_
+#define _TEXT_ABBREV_H_
+
+#include <QString>
+#include <QStringList>
+
+class QFontMetrics;
+
+class TextAbbrev 
+{
+public:
+    enum Policy {
+        ElideEnd,
+        ElideEndAndCommonPrefixes,
+        ElideStart,
+        ElideMiddle
+    };
+
+    /**
+     * Abbreviate the given text to the given maximum length
+     * (including ellipsis), using the given abbreviation policy.  If
+     * fuzzy is true, the text will be left alone if it is "not much
+     * more than" the maximum length.
+     * 
+     * If ellipsis is non-empty, it will be used to show elisions in
+     * preference to the default (which is "...").
+     */
+    static QString abbreviate(QString text, int maxLength,
+                              Policy policy = ElideEnd,
+                              bool fuzzy = true,
+                              QString ellipsis = "");
+
+    /**
+     * Abbreviate the given text to the given maximum painted width,
+     * using the given abbreviation policy.  maxWidth is also modified
+     * so as to return the painted width of the abbreviated text.
+     *
+     * If ellipsis is non-empty, it will be used to show elisions in
+     * preference to the default (which is tr("...")).
+     */
+    static QString abbreviate(QString text,
+                              const QFontMetrics &metrics,
+                              int &maxWidth,
+                              Policy policy = ElideEnd,
+                              QString ellipsis = "");
+    
+    /**
+     * Abbreviate all of the given texts to the given maximum length,
+     * using the given abbreviation policy.  If fuzzy is true, texts
+     * that are "not much more than" the maximum length will be left
+     * alone.
+     *
+     * If ellipsis is non-empty, it will be used to show elisions in
+     * preference to the default (which is tr("...")).
+     */
+    static QStringList abbreviate(const QStringList &texts, int maxLength,
+                                  Policy policy = ElideEndAndCommonPrefixes,
+                                  bool fuzzy = true,
+                                  QString ellipsis = "");
+
+    /**
+     * Abbreviate all of the given texts to the given maximum painted
+     * width, using the given abbreviation policy.  maxWidth is also
+     * modified so as to return the maximum painted width of the
+     * abbreviated texts.
+     *
+     * If ellipsis is non-empty, it will be used to show elisions in
+     * preference to the default (which is tr("...")).
+     */
+    static QStringList abbreviate(const QStringList &texts,
+                                  const QFontMetrics &metrics,
+                                  int &maxWidth,
+                                  Policy policy = ElideEndAndCommonPrefixes,
+                                  QString ellipsis = "");
+
+protected:
+    static QString getDefaultEllipsis();
+    static int getFuzzLength(QString ellipsis);
+    static int getFuzzWidth(const QFontMetrics &metrics, QString ellipsis);
+    static QString abbreviateTo(QString text, int characters,
+                                Policy policy, QString ellipsis);
+    static QStringList elidePrefixes(const QStringList &texts,
+                                     int targetReduction,
+                                     QString ellipsis);
+    static QStringList elidePrefixes(const QStringList &texts,
+                                     const QFontMetrics &metrics,
+                                     int targetWidthReduction,
+                                     QString ellipsis);
+    static int getPrefixLength(const QStringList &texts);
+};
+
+#endif
+