comparison src/squeezedlabel.cpp @ 523:d869e6a18f63

Make the text labels in the work status area squeezable for small window sizes.  Fixes #329

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    EasyMercurial
+
+    Based on HgExplorer by Jari Korhonen
+    Copyright (c) 2010 Jari Korhonen
+    Copyright (c) 2011 Chris Cannam
+    Copyright (c) 2011 Queen Mary, University of London
+    
+    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.
+*/
+
+/*
+    This file adapted from Rosegarden, a sequencer and musical
+    notation editor.  Copyright 2000-2011 the Rosegarden development
+    team.
+
+    Adapted from KDE 4.2.0, this code originally Copyright (c) 2000
+    Ronny Standtke.
+*/
+
+#include "squeezedlabel.h"
+
+#include <iostream>
+
+#include <QContextMenuEvent>
+#include <QAction>
+#include <QMenu>
+#include <QClipboard>
+#include <QApplication>
+#include <QMimeData>
+#include <QDesktopWidget>
+
+
+class SqueezedLabelPrivate
+{
+public:
+};
+
+void SqueezedLabel::_k_copyFullText()
+{
+    QMimeData* data = new QMimeData;
+    data->setText(fullText);
+    QApplication::clipboard()->setMimeData(data);
+}
+
+SqueezedLabel::SqueezedLabel(const QString &text , QWidget *parent)
+        : QLabel (parent)
+{
+    setObjectName("SQUEEZED");
+    setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed));
+    fullText = text;
+    elideMode = Qt::ElideMiddle;
+    squeezeTextToLabel();
+}
+
+SqueezedLabel::SqueezedLabel(QWidget *parent)
+        : QLabel (parent)
+{
+    setObjectName("SQUEEZED");
+    setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed));
+    elideMode = Qt::ElideMiddle;
+}
+
+SqueezedLabel::~SqueezedLabel()
+{
+}
+
+void SqueezedLabel::resizeEvent(QResizeEvent *)
+{
+    squeezeTextToLabel();
+}
+
+QSize SqueezedLabel::minimumSizeHint() const
+{
+    QSize sh = QLabel::minimumSizeHint();
+    sh.setWidth(-1);
+    return sh;
+}
+
+QSize SqueezedLabel::sizeHint() const
+{
+    int dw = QApplication::desktop()->availableGeometry(QPoint(0, 0)).width();
+    int maxWidth = dw * 3 / 4;
+    QFontMetrics fm(fontMetrics());
+    int textWidth = fm.width(fullText);
+    if (textWidth > maxWidth) {
+        textWidth = maxWidth;
+    }
+    return QSize(textWidth, QLabel::sizeHint().height());
+}
+
+void SqueezedLabel::setText(const QString &text)
+{
+    fullText = text;
+    squeezeTextToLabel();
+}
+
+void SqueezedLabel::clear() {
+    fullText.clear();
+    QLabel::clear();
+}
+
+void SqueezedLabel::squeezeTextToLabel() {
+    QFontMetrics fm(fontMetrics());
+    int labelWidth = size().width();
+    QStringList squeezedLines;
+    bool squeezed = false;
+    Q_FOREACH(const QString& line, fullText.split('\n')) {
+        int lineWidth = fm.width(line);
+        if (lineWidth > labelWidth) {
+            squeezed = true;
+            squeezedLines << fm.elidedText(line, elideMode, labelWidth);
+        } else {
+            squeezedLines << line;
+        }
+    }
+
+    if (squeezed) {
+        QLabel::setText(squeezedLines.join("\n"));
+        setToolTip(fullText);
+    } else {
+        QLabel::setText(fullText);
+        setToolTip(QString());
+    }
+}
+
+void SqueezedLabel::setAlignment(Qt::Alignment alignment)
+{
+    // save fullText and restore it
+    QString tmpFull(fullText);
+    QLabel::setAlignment(alignment);
+    fullText = tmpFull;
+}
+
+Qt::TextElideMode SqueezedLabel::textElideMode() const
+{
+    return elideMode;
+}
+
+void SqueezedLabel::setTextElideMode(Qt::TextElideMode mode)
+{
+    elideMode = mode;
+    squeezeTextToLabel();
+}
+
+void SqueezedLabel::contextMenuEvent(QContextMenuEvent* ev)
+{
+    // "We" means the KDE team here.
+    //
+    // We want to reimplement "Copy" to include the elided text.
+    // But this means reimplementing the full popup menu, so no more
+    // copy-link-address or copy-selection support anymore, since we
+    // have no access to the QTextDocument.
+    // Maybe we should have a boolean flag in SqueezedLabel itself for
+    // whether to show the "Copy Full Text" custom popup?
+    // For now I chose to show it when the text is squeezed; when it's not, the
+    // standard popup menu can do the job (select all, copy).
+
+    const bool squeezed = text() != fullText;
+    const bool showCustomPopup = squeezed;
+    if (showCustomPopup) {
+        QMenu menu(this);
+
+        QAction* act = new QAction(tr("&Copy Full Text"), this);
+        connect(act, SIGNAL(triggered()), this, SLOT(_k_copyFullText()));
+        menu.addAction(act);
+
+        ev->accept();
+        menu.exec(ev->globalPos());
+    } else {
+        QLabel::contextMenuEvent(ev);
+    }
+}
+