annotate src/squeezedlabel.cpp @ 571:012ba1b83328

Show cancel button with progress bar only when running an operation that it makes sense to cancel (we don't really want people cancelling e.g. initial folder scan because it would leave things in an inconsistent state)

/* -*- 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) 2012 Chris Cannam
    Copyright (c) 2012 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 2000-2012 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);
    }
}