klfdisplaylabel.cpp

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/***************************************************************************
 *   file klfdisplaylabel.cpp
 *   This file is part of the KLatexFormula Project.
 *   Copyright (C) 2011 by Philippe Faist
 *   philippe.faist at bluewin.ch
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
/* $Id: klfdisplaylabel.cpp 603 2011-02-26 23:14:55Z phfaist $ */

#include <QLabel>
#include <QDir>
#include <QTemporaryFile>
#include <QMessageBox>
#include <QVariant>
#include <QPainter>

#include <klfguiutil.h>
#include "klfdisplaylabel.h"


KLFDisplayLabel::KLFDisplayLabel(QWidget *parent)
  : QLabel(parent), pEnableToolTipPreview(true), mToolTipFile(NULL)
{
  setText(QString());
  setLabelFixedSize(QSize(120,80));

  setAlignment(Qt::AlignCenter);

  pDefaultPalette = palette();
  pErrorPalette = pDefaultPalette;
  pErrorPalette.setColor(QPalette::Window, QColor(255, 200, 200));

  pGE = false;
  pGEcolor = QColor(128, 255, 128, 8);
  pGEradius = 4;
}

KLFDisplayLabel::~KLFDisplayLabel()
{
  if (mToolTipFile)
    delete mToolTipFile;
}

void KLFDisplayLabel::setLabelFixedSize(const QSize& size)
{
  pLabelFixedSize = size;
  setMinimumSize(size);
  setFixedSize(size);
}


void KLFDisplayLabel::displayClear()
{
  setPixmap(QPixmap());
  setText(QString());
  setEnabled(false);
  set_error(false);
}

void KLFDisplayLabel::display(QImage displayimg, QImage tooltipimage, bool labelenabled)
{
  QImage img = displayimg;
  QPixmap pix;
  if (labelenabled && pGE) {
    int r = pGEradius;
    QSize msz = QSize(2*r, 2*r);
    if (img.width()+msz.width() > width() || img.height()+msz.height() > height())
      img = displayimg.scaled(size()-msz, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix = QPixmap(img.size()+msz);
    pix.fill(QColor(0,0,0,0));
    QPainter painter(&pix);
    painter.translate(QPoint(r, r));
    klfDrawGlowedImage(&painter, img, pGEcolor, r);
  } else {
    if (img.width() > width() || img.height() > height())
      img = displayimg.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix = QPixmap::fromImage(img);
  }
  setPixmap(pix);

  // un-set any error
  set_error(false);

  if (mToolTipFile) {
    delete mToolTipFile;
    mToolTipFile = 0;
  }
  // no big preview by default
  _bigPreviewText = "";
  // but if one is given then prepare it (prepare it even if "enableToolTipPreview" is false,
  // because we will need it for the "showBigPreview" button)
  if ( ! tooltipimage.isNull() ) {
    QString tempdir = QDir::tempPath();
    mToolTipFile = new QTemporaryFile(tempdir+"/klf_tooltip_XXXXXX.png", this);
    if ( ! mToolTipFile->open() ) {
      qWarning("WARNING: Failed open for ToolTip Temp Image!\n%s\n",
               qPrintable(mToolTipFile->fileTemplate()));
      delete mToolTipFile;
      mToolTipFile = 0;
    } else {
      mToolTipFile->setAutoRemove(true);
      bool res = tooltipimage.save(mToolTipFile, "PNG");
      if ( ! res ) {
        QMessageBox::critical(this, tr("Error"), tr("Failed write to ToolTip Temp Image file %1!")
                              .arg(mToolTipFile->fileName()));
        qWarning("WARNING: Failed write to Tooltip temp image to temporary file `%s' !\n",
                 qPrintable(mToolTipFile->fileTemplate()));
        delete mToolTipFile;
        mToolTipFile = 0;
      } else {
        _bigPreviewText = QString("<img src=\"%1\">").arg(mToolTipFile->fileName());
      }
    }
  }
  if (pEnableToolTipPreview) {
    setToolTip(QString("<p style=\"padding: 8px 8px 8px 8px;\">%1</p>").arg(_bigPreviewText));
  } else {
    setToolTip(QString(""));
  }

  setEnabled(labelenabled);
}

void KLFDisplayLabel::displayError(bool labelenabled)
{
  set_error(true);
  setEnabled(labelenabled);
}


void KLFDisplayLabel::set_error(bool error_on)
{
  setProperty("realTimeLatexError", QVariant(error_on));
  QPalette *p;
  if (error_on) {
    p = &pErrorPalette;
  } else {
    p = &pDefaultPalette;
  }
  setAutoFillBackground(true);
  setStyleSheet(styleSheet()); // force style sheet refresh
  setPalette(*p);
}

void KLFDisplayLabel::mouseMoveEvent(QMouseEvent */*e*/)
{
  emit labelDrag();
}