src/panels/information/informationpanel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006-2009 by Peter Penz <peter.penz@gmx.at>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "informationpanel.h"
  21 #include <kdirnotify.h>
  22 #include <QShowEvent>
  23 #include "informationpanelcontent.h"
  24
  25 InformationPanel::InformationPanel(QWidget* parent) :
  26     Panel(parent),
  27     m_initialized(false),
  28     m_infoTimer(0),
  29     m_urlChangedTimer(0),
  30     m_resetUrlTimer(0),
  31     m_shownUrl(),
  32     m_urlCandidate(),
  33     m_invalidUrlCandidate(),
  34     m_fileItem(),
  35     m_selection(),
  36     m_content(0)
  37 {
  38 }
  39
  40 InformationPanel::~InformationPanel()
  41 {
  42 }
  43
  44 QSize InformationPanel::sizeHint() const
  45 {
  46     QSize size = Panel::sizeHint();
  47     size.setWidth(minimumSizeHint().width());
  48     return size;
  49 }
  50
  51 void InformationPanel::setUrl(const KUrl& url)
  52 {
  53     Panel::setUrl(url);
  54     if (url.isValid() && !isEqualToShownUrl(url)) {
  55         if (isVisible()) {
  56             cancelRequest();
  57             m_shownUrl = url;
  58             // Update the content with a delay. This gives
  59             // the directory lister the chance to show the content
  60             // before expensive operations are done to show
  61             // meta information.
  62             m_urlChangedTimer->start();
  63         } else {
  64             m_shownUrl = url;
  65         }
  66     }
  67 }
  68
  69 void InformationPanel::setSelection(const KFileItemList& selection)
  70 {
  71     if (!isVisible()) {
  72         return;
  73     }
  74
  75     if ((selection.count() == 0) && (m_selection.count() == 0)) {
  76         // The selection has not really changed, only the current index.
  77         // QItemSelectionModel emits a signal in this case and it is less
  78         // expensive doing the check this way instead of patching
  79         // DolphinView::emitSelectionChanged().
  80         return;
  81     }
  82
  83     m_selection = selection;
  84
  85     const int count = selection.count();
  86     if (count == 0) {
  87         if (!isEqualToShownUrl(url())) {
  88             m_shownUrl = url();
  89             showItemInfo();
  90         }
  91     } else {
  92         if ((count == 1) && !selection.first().url().isEmpty()) {
  93             m_urlCandidate = selection.first().url();
  94         }
  95         m_infoTimer->start();
  96     }
  97 }
  98
  99 void InformationPanel::requestDelayedItemInfo(const KFileItem& item)
 100 {
 101     if (!isVisible()) {
 102         return;
 103     }
 104
 105     cancelRequest();
 106
 107     m_fileItem = KFileItem();
 108     if (item.isNull()) {
 109         // The cursor is above the viewport. If files are selected,
 110         // show information regarding the selection.
 111         if (m_selection.size() > 0) {
 112             m_infoTimer->start();
 113         }
 114     } else {
 115         const KUrl url = item.url();
 116         if (url.isValid() && !isEqualToShownUrl(url)) {
 117             m_urlCandidate = item.url();
 118             m_fileItem = item;
 119             m_infoTimer->start();
 120         }
 121     }
 122 }
 123
 124 void InformationPanel::showEvent(QShowEvent* event)
 125 {
 126     Panel::showEvent(event);
 127     if (!event->spontaneous()) {
 128         if (!m_initialized) {
 129             // do a delayed initialization so that no performance
 130             // penalty is given when Dolphin is started with a closed
 131             // Information Panel
 132             init();
 133         }
 134         showItemInfo();
 135     }
 136 }
 137
 138 void InformationPanel::resizeEvent(QResizeEvent* event)
 139 {
 140     if (isVisible()) {
 141         m_urlCandidate = m_shownUrl;
 142         m_infoTimer->start();
 143     }
 144     Panel::resizeEvent(event);
 145 }
 146
 147 void InformationPanel::contextMenuEvent(QContextMenuEvent* event)
 148 {
 149     m_content->configureSettings();
 150     Panel::contextMenuEvent(event);
 151 }
 152
 153 void InformationPanel::showItemInfo()
 154 {
 155     if (!isVisible()) {
 156         return;
 157     }
 158
 159     cancelRequest();
 160
 161     if (showMultipleSelectionInfo()) {
 162         m_content->showItems(m_selection);
 163         m_shownUrl = KUrl();
 164     } else {
 165         KFileItem item;
 166         if (!m_fileItem.isNull()) {
 167             item = m_fileItem;
 168         } else if (!m_selection.isEmpty()) {
 169             Q_ASSERT(m_selection.count() == 1);
 170             item = m_selection.first();
 171         } else {
 172             // no item is hovered and no selection has been done: provide
 173             // an item for the directory represented by m_shownUrl
 174             m_fileItem = KFileItem(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 175             m_fileItem.refresh();
 176             item = m_fileItem;
 177         }
 178
 179         m_content->showItem(item);
 180     }
 181 }
 182
 183 void InformationPanel::slotInfoTimeout()
 184 {
 185     m_shownUrl = m_urlCandidate;
 186     showItemInfo();
 187 }
 188
 189 void InformationPanel::reset()
 190 {
 191     if (m_invalidUrlCandidate == m_shownUrl) {
 192         m_invalidUrlCandidate = KUrl();
 193
 194         // The current URL is still invalid. Reset
 195         // the content to show the directory URL.
 196         m_selection.clear();
 197         m_shownUrl = url();
 198         m_fileItem = KFileItem();
 199         showItemInfo();
 200     }
 201 }
 202
 203 void InformationPanel::slotFileRenamed(const QString& source, const QString& dest)
 204 {
 205     if (m_shownUrl == KUrl(source)) {
 206         m_shownUrl = KUrl(dest);
 207         m_fileItem = KFileItem(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 208         showItemInfo();
 209     }
 210 }
 211
 212 void InformationPanel::slotFilesAdded(const QString& directory)
 213 {
 214     if (m_shownUrl == KUrl(directory)) {
 215         // If the 'trash' icon changes because the trash has been emptied or got filled,
 216         // the signal filesAdded("trash:/") will be emitted.
 217         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 218         requestDelayedItemInfo(item);
 219     }
 220 }
 221
 222 void InformationPanel::slotFilesChanged(const QStringList& files)
 223 {
 224     foreach (const QString& fileName, files) {
 225         if (m_shownUrl == KUrl(fileName)) {
 226             showItemInfo();
 227             break;
 228         }
 229     }
 230 }
 231
 232 void InformationPanel::slotFilesRemoved(const QStringList& files)
 233 {
 234     foreach (const QString& fileName, files) {
 235         if (m_shownUrl == KUrl(fileName)) {
 236             // the currently shown item has been removed, show
 237             // the parent directory as fallback
 238             markUrlAsInvalid();
 239             break;
 240         }
 241     }
 242 }
 243
 244 void InformationPanel::slotEnteredDirectory(const QString& directory)
 245 {
 246     if (m_shownUrl == KUrl(directory)) {
 247         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 248         requestDelayedItemInfo(item);
 249     }
 250 }
 251
 252 void InformationPanel::slotLeftDirectory(const QString& directory)
 253 {
 254     if (m_shownUrl == KUrl(directory)) {
 255         // The signal 'leftDirectory' is also emitted when a media
 256         // has been unmounted. In this case no directory change will be
 257         // done in Dolphin, but the Information Panel must be updated to
 258         // indicate an invalid directory.
 259         markUrlAsInvalid();
 260     }
 261 }
 262
 263 void InformationPanel::cancelRequest()
 264 {
 265     m_infoTimer->stop();
 266 }
 267
 268 bool InformationPanel::showMultipleSelectionInfo() const
 269 {
 270     return m_fileItem.isNull() && (m_selection.count() > 1);
 271 }
 272
 273 bool InformationPanel::isEqualToShownUrl(const KUrl& url) const
 274 {
 275     return m_shownUrl.equals(url, KUrl::CompareWithoutTrailingSlash);
 276 }
 277
 278 void InformationPanel::markUrlAsInvalid()
 279 {
 280     m_invalidUrlCandidate = m_shownUrl;
 281     m_resetUrlTimer->start();
 282 }
 283
 284 void InformationPanel::init()
 285 {
 286     const int defaultDelay = 300;
 287
 288     m_infoTimer = new QTimer(this);
 289     m_infoTimer->setInterval(defaultDelay);
 290     m_infoTimer->setSingleShot(true);
 291     connect(m_infoTimer, SIGNAL(timeout()),
 292             this, SLOT(slotInfoTimeout()));
 293
 294     m_urlChangedTimer = new QTimer(this);
 295     m_urlChangedTimer->setInterval(defaultDelay);
 296     m_urlChangedTimer->setSingleShot(true);
 297     connect(m_urlChangedTimer, SIGNAL(timeout()),
 298             this, SLOT(showItemInfo()));
 299
 300     m_resetUrlTimer = new QTimer(this);
 301     m_resetUrlTimer->setInterval(defaultDelay * 3);
 302     m_resetUrlTimer->setSingleShot(true);
 303     connect(m_resetUrlTimer, SIGNAL(timeout()),
 304             this, SLOT(reset()));
 305
 306     org::kde::KDirNotify* dirNotify = new org::kde::KDirNotify(QString(), QString(),
 307                                                                QDBusConnection::sessionBus(), this);
 308     connect(dirNotify, SIGNAL(FileRenamed(QString, QString)), SLOT(slotFileRenamed(QString, QString)));
 309     connect(dirNotify, SIGNAL(FilesAdded(QString)), SLOT(slotFilesAdded(QString)));
 310     connect(dirNotify, SIGNAL(FilesChanged(QStringList)), SLOT(slotFilesChanged(QStringList)));
 311     connect(dirNotify, SIGNAL(FilesRemoved(QStringList)), SLOT(slotFilesRemoved(QStringList)));
 312     connect(dirNotify, SIGNAL(enteredDirectory(QString)), SLOT(slotEnteredDirectory(QString)));
 313     connect(dirNotify, SIGNAL(leftDirectory(QString)), SLOT(slotLeftDirectory(QString)));
 314
 315     m_content = new InformationPanelContent(this);
 316
 317     m_initialized = true;
 318 }
 319
 320 #include "informationpanel.moc"