src/statusbarmessagelabel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz                                      *
   3  *   peter.penz@gmx.at                                                     *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
  19  ***************************************************************************/
  20
  21 #include "statusbarmessagelabel.h"
  22
  23 #include <kcolorscheme.h>
  24 #include <kiconloader.h>
  25 #include <kicon.h>
  26 #include <klocale.h>
  27
  28 #include <QFontMetrics>
  29 #include <QPainter>
  30 #include <QKeyEvent>
  31 #include <QPushButton>
  32 #include <QPixmap>
  33 #include <QTimer>
  34
  35 StatusBarMessageLabel::StatusBarMessageLabel(QWidget* parent) :
  36     QWidget(parent),
  37     m_type(DolphinStatusBar::Default),
  38     m_state(Default),
  39     m_illumination(0),
  40     m_minTextHeight(-1),
  41     m_timer(0),
  42     m_closeButton(0)
  43 {
  44     setMinimumHeight(KIconLoader::SizeSmall);
  45
  46     QPalette palette;
  47     palette.setColor(QPalette::Background, Qt::transparent);
  48     setPalette(palette);
  49
  50     m_timer = new QTimer(this);
  51     connect(m_timer, SIGNAL(timeout()),
  52             this, SLOT(timerDone()));
  53
  54     m_closeButton = new QPushButton(i18nc("@action:button", "Close"), this);
  55     m_closeButton->hide();
  56     connect(m_closeButton, SIGNAL(clicked()),
  57             this, SLOT(closeErrorMessage()));
  58 }
  59
  60 StatusBarMessageLabel::~StatusBarMessageLabel()
  61 {
  62 }
  63
  64 void StatusBarMessageLabel::setMessage(const QString& text,
  65                                        DolphinStatusBar::Type type)
  66 {
  67     if ((text == m_text) && (type == m_type)) {
  68         return;
  69     }
  70
  71     if (m_type == DolphinStatusBar::Error) {
  72         if (type == DolphinStatusBar::Error) {
  73             m_pendingMessages.insert(0, m_text);
  74         } else if ((m_state != Default) || !m_pendingMessages.isEmpty()) {
  75             // a non-error message should not be shown, as there
  76             // are other pending error messages in the queue
  77             return;
  78         }
  79     }
  80
  81     m_text = text;
  82     m_type = type;
  83
  84     m_timer->stop();
  85     m_illumination = 0;
  86     m_state = Default;
  87
  88     const char* iconName = 0;
  89     QPixmap pixmap;
  90     switch (type) {
  91     case DolphinStatusBar::OperationCompleted:
  92         iconName = "dialog-ok";
  93         // "ok" icon should probably be "dialog-success", but we don't have that icon in KDE 4.0
  94         m_closeButton->hide();
  95         break;
  96
  97     case DolphinStatusBar::Information:
  98         iconName = "dialog-information";
  99         m_closeButton->hide();
 100         break;
 101
 102     case DolphinStatusBar::Error:
 103         m_timer->start(100);
 104         m_state = Illuminate;
 105
 106         updateCloseButtonPosition();
 107         m_closeButton->show();
 108         break;
 109
 110     case DolphinStatusBar::Default:
 111     default:
 112         m_closeButton->hide();
 113         break;
 114     }
 115
 116     m_pixmap = (iconName == 0) ? QPixmap() : SmallIcon(iconName);
 117     QTimer::singleShot(GeometryTimeout, this, SLOT(assureVisibleText()));
 118     update();
 119 }
 120
 121 void StatusBarMessageLabel::setMinimumTextHeight(int min)
 122 {
 123     if (min != m_minTextHeight) {
 124         m_minTextHeight = min;
 125         setMinimumHeight(min);
 126         if (m_closeButton->height() > min) {
 127             m_closeButton->setFixedHeight(min);
 128         }
 129     }
 130 }
 131
 132 int StatusBarMessageLabel::widthGap() const
 133 {
 134     QFontMetrics fontMetrics(font());
 135     const int defaultGap = 10;
 136     return fontMetrics.width(m_text) - availableTextWidth() + defaultGap;
 137 }
 138
 139 void StatusBarMessageLabel::paintEvent(QPaintEvent* /* event */)
 140 {
 141     QPainter painter(this);
 142
 143     // draw background
 144     QColor backgroundColor = palette().window().color();
 145     if (m_illumination > 0) {
 146         // at this point, a: we are a second label being drawn over the already
 147         // painted status area, so we can be translucent, and b: our palette's
 148         // window color (bg only) seems to be wrong (always black)
 149         KColorScheme scheme(palette().currentColorGroup(), KColorScheme::Window);
 150         backgroundColor = scheme.background(KColorScheme::NegativeBackground).color();
 151         backgroundColor.setAlpha(qMin(255, m_illumination*2));
 152     }
 153     painter.setBrush(backgroundColor);
 154     painter.setPen(Qt::NoPen);
 155     painter.drawRect(QRect(0, 0, width(), height()));
 156
 157     // draw pixmap
 158     int x = BorderGap;
 159     int y = (m_minTextHeight - m_pixmap.height()) / 2;
 160
 161     if (!m_pixmap.isNull()) {
 162         painter.drawPixmap(x, y, m_pixmap);
 163         x += m_pixmap.width() + BorderGap;
 164     }
 165
 166     // draw text
 167     painter.setPen(palette().windowText().color());
 168     int flags = Qt::AlignVCenter;
 169     if (height() > m_minTextHeight) {
 170         flags = flags | Qt::TextWordWrap;
 171     }
 172     painter.drawText(QRect(x, 0, availableTextWidth(), height()), flags, m_text);
 173     painter.end();
 174 }
 175
 176 void StatusBarMessageLabel::resizeEvent(QResizeEvent* event)
 177 {
 178     QWidget::resizeEvent(event);
 179     updateCloseButtonPosition();
 180     QTimer::singleShot(GeometryTimeout, this, SLOT(assureVisibleText()));
 181 }
 182
 183 void StatusBarMessageLabel::timerDone()
 184 {
 185     switch (m_state) {
 186     case Illuminate: {
 187         // increase the illumination
 188         const int illumination_max = 128;
 189         if (m_illumination < illumination_max) {
 190             m_illumination += 32;
 191             if (m_illumination > illumination_max) {
 192                 m_illumination = illumination_max;
 193             }
 194             update();
 195         } else {
 196             m_state = Illuminated;
 197             m_timer->start(5000);
 198         }
 199         break;
 200     }
 201
 202     case Illuminated: {
 203         // start desaturation
 204         m_state = Desaturate;
 205         m_timer->start(100);
 206         break;
 207     }
 208
 209     case Desaturate: {
 210         // desaturate
 211         if (m_illumination > 0) {
 212             m_illumination -= 5;
 213             update();
 214         } else {
 215             m_state = Default;
 216             m_timer->stop();
 217         }
 218         break;
 219     }
 220
 221     default:
 222         break;
 223     }
 224 }
 225
 226 void StatusBarMessageLabel::assureVisibleText()
 227 {
 228     if (m_text.isEmpty()) {
 229         return;
 230     }
 231
 232     // calculate the required height of the widget thats
 233     // needed for having a fully visible text
 234     QFontMetrics fontMetrics(font());
 235     const QRect bounds(fontMetrics.boundingRect(0, 0, availableTextWidth(), height(),
 236                        Qt::AlignVCenter | Qt::TextWordWrap,
 237                        m_text));
 238     int requiredHeight = bounds.height();
 239     if (requiredHeight < m_minTextHeight) {
 240         requiredHeight = m_minTextHeight;
 241     }
 242
 243     // Increase/decrease the current height of the widget to the
 244     // required height. The increasing/decreasing is done in several
 245     // steps to have an animation if the height is modified
 246     // (see StatusBarMessageLabel::resizeEvent())
 247     const int gap = m_minTextHeight / 2;
 248     int minHeight = minimumHeight();
 249     if (minHeight < requiredHeight) {
 250         minHeight += gap;
 251         if (minHeight > requiredHeight) {
 252             minHeight = requiredHeight;
 253         }
 254         setMinimumHeight(minHeight);
 255         updateGeometry();
 256     } else if (minHeight > requiredHeight) {
 257         minHeight -= gap;
 258         if (minHeight < requiredHeight) {
 259             minHeight = requiredHeight;
 260         }
 261         setMinimumHeight(minHeight);
 262         updateGeometry();
 263     }
 264
 265     updateCloseButtonPosition();
 266 }
 267
 268 int StatusBarMessageLabel::availableTextWidth() const
 269 {
 270     const int buttonWidth = (m_type == DolphinStatusBar::Error) ?
 271                             m_closeButton->width() + BorderGap : 0;
 272     return width() - m_pixmap.width() - (BorderGap * 4) - buttonWidth;
 273 }
 274
 275 void StatusBarMessageLabel::updateCloseButtonPosition()
 276 {
 277     const int x = width() - m_closeButton->width() - BorderGap;
 278     const int y = (height() - m_closeButton->height()) / 2;
 279     m_closeButton->move(x, y);
 280 }
 281
 282 void StatusBarMessageLabel::closeErrorMessage()
 283 {
 284     if (!showPendingMessage()) {
 285         reset();
 286         setMessage(m_defaultText, DolphinStatusBar::Default);
 287     }
 288 }
 289
 290 bool StatusBarMessageLabel::showPendingMessage()
 291 {
 292     if (!m_pendingMessages.isEmpty()) {
 293         reset();
 294         setMessage(m_pendingMessages.takeFirst(), DolphinStatusBar::Error);
 295         return true;
 296     }
 297     return false;
 298 }
 299
 300 void StatusBarMessageLabel::reset()
 301 {
 302     m_text.clear();
 303     m_type = DolphinStatusBar::Default;
 304 }
 305
 306 #include "statusbarmessagelabel.moc"