src/panels/information/informationpanel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006-2009 by Peter Penz <peter.penz19@gmail.com>        *
   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
  22 #include "informationpanelcontent.h"
  23 #include <KIO/Job>
  24 #include <KDirNotify>
  25 #include <QApplication>
  26 #include <QShowEvent>
  27 #include <QVBoxLayout>
  28
  29 InformationPanel::InformationPanel(QWidget* parent) :
  30     Panel(parent),
  31     m_initialized(false),
  32     m_infoTimer(0),
  33     m_urlChangedTimer(0),
  34     m_resetUrlTimer(0),
  35     m_shownUrl(),
  36     m_urlCandidate(),
  37     m_invalidUrlCandidate(),
  38     m_fileItem(),
  39     m_selection(),
  40     m_folderStatJob(0),
  41     m_content(0)
  42 {
  43 }
  44
  45 InformationPanel::~InformationPanel()
  46 {
  47 }
  48
  49 void InformationPanel::setSelection(const KFileItemList& selection)
  50 {
  51     if (!isVisible()) {
  52         return;
  53     }
  54
  55     if (selection.isEmpty() && m_selection.isEmpty()) {
  56         // The selection has not really changed, only the current index.
  57         // QItemSelectionModel emits a signal in this case and it is less
  58         // expensive doing the check this way instead of patching
  59         // DolphinView::emitSelectionChanged().
  60         return;
  61     }
  62
  63     m_selection = selection;
  64     m_fileItem = KFileItem();
  65
  66     const int count = selection.count();
  67     if (count == 0) {
  68         if (!isEqualToShownUrl(url())) {
  69             m_shownUrl = url();
  70             showItemInfo();
  71         }
  72     } else {
  73         if ((count == 1) && !selection.first().url().isEmpty()) {
  74             m_urlCandidate = selection.first().url();
  75         }
  76         m_infoTimer->start();
  77     }
  78 }
  79
  80 void InformationPanel::requestDelayedItemInfo(const KFileItem& item)
  81 {
  82     if (!isVisible() || (item.isNull() && m_fileItem.isNull())) {
  83         return;
  84     }
  85
  86     if (QApplication::mouseButtons() & Qt::LeftButton) {
  87         // Ignore the request of an item information when a rubberband
  88         // selection is ongoing.
  89         return;
  90     }
  91
  92     cancelRequest();
  93
  94     if (item.isNull()) {
  95         // The cursor is above the viewport. If files are selected,
  96         // show information regarding the selection.
  97         if (m_selection.size() > 0) {
  98             m_fileItem = KFileItem();
  99             m_infoTimer->start();
 100         }
 101     } else if (item.url().isValid() && !isEqualToShownUrl(item.url())) {
 102         // The cursor is above an item that is not shown currently
 103         m_urlCandidate = item.url();
 104         m_fileItem = item;
 105         m_infoTimer->start();
 106     }
 107 }
 108
 109 bool InformationPanel::urlChanged()
 110 {
 111     if (!url().isValid()) {
 112         return false;
 113     }
 114
 115     if (!isVisible()) {
 116         return true;
 117     }
 118
 119     cancelRequest();
 120     m_selection.clear();
 121
 122     if (!isEqualToShownUrl(url())) {
 123         m_shownUrl = url();
 124         m_fileItem = KFileItem();
 125
 126         // Update the content with a delay. This gives
 127         // the directory lister the chance to show the content
 128         // before expensive operations are done to show
 129         // meta information.
 130         m_urlChangedTimer->start();
 131     }
 132
 133     return true;
 134 }
 135
 136 void InformationPanel::showEvent(QShowEvent* event)
 137 {
 138     Panel::showEvent(event);
 139     if (!event->spontaneous()) {
 140         if (!m_initialized) {
 141             // do a delayed initialization so that no performance
 142             // penalty is given when Dolphin is started with a closed
 143             // Information Panel
 144             init();
 145         }
 146
 147         m_shownUrl = url();
 148         showItemInfo();
 149     }
 150 }
 151
 152 void InformationPanel::resizeEvent(QResizeEvent* event)
 153 {
 154     if (isVisible()) {
 155         m_urlCandidate = m_shownUrl;
 156         m_infoTimer->start();
 157     }
 158     Panel::resizeEvent(event);
 159 }
 160
 161 void InformationPanel::contextMenuEvent(QContextMenuEvent* event)
 162 {
 163     // TODO: Move code from InformationPanelContent::configureSettings() here
 164     m_content->configureSettings(customContextMenuActions());
 165     Panel::contextMenuEvent(event);
 166 }
 167
 168 void InformationPanel::showItemInfo()
 169 {
 170     if (!isVisible()) {
 171         return;
 172     }
 173
 174     cancelRequest();
 175
 176     if (m_fileItem.isNull() && (m_selection.count() > 1)) {
 177         // The information for a selection of items should be shown
 178         m_content->showItems(m_selection);
 179     } else {
 180         // The information for exactly one item should be shown
 181         KFileItem item;
 182         if (!m_fileItem.isNull()) {
 183             item = m_fileItem;
 184         } else if (!m_selection.isEmpty()) {
 185             Q_ASSERT(m_selection.count() == 1);
 186             item = m_selection.first();
 187         }
 188
 189         if (item.isNull()) {
 190             // No item is hovered and no selection has been done: provide
 191             // an item for the currently shown directory.
 192             m_folderStatJob = KIO::stat(url(), KIO::HideProgressInfo);
 193             connect(m_folderStatJob, SIGNAL(result(KJob*)),
 194                     this, SLOT(slotFolderStatFinished(KJob*)));
 195         } else {
 196             m_content->showItem(item);
 197         }
 198     }
 199 }
 200
 201 void InformationPanel::slotFolderStatFinished(KJob* job)
 202 {
 203     m_folderStatJob = 0;
 204     const KIO::UDSEntry entry = static_cast<KIO::StatJob*>(job)->statResult();
 205     m_content->showItem(KFileItem(entry, m_shownUrl));
 206 }
 207
 208 void InformationPanel::slotInfoTimeout()
 209 {
 210     m_shownUrl = m_urlCandidate;
 211     m_urlCandidate.clear();
 212     showItemInfo();
 213 }
 214
 215 void InformationPanel::reset()
 216 {
 217     if (m_invalidUrlCandidate == m_shownUrl) {
 218         m_invalidUrlCandidate = KUrl();
 219
 220         // The current URL is still invalid. Reset
 221         // the content to show the directory URL.
 222         m_selection.clear();
 223         m_shownUrl = url();
 224         m_fileItem = KFileItem();
 225         showItemInfo();
 226     }
 227 }
 228
 229 void InformationPanel::slotFileRenamed(const QString& source, const QString& dest)
 230 {
 231     if (m_shownUrl == KUrl(source)) {
 232         m_shownUrl = KUrl(dest);
 233         m_fileItem = KFileItem(KFileItem::Unknown, KFileItem::Unknown, m_shownUrl);
 234
 235         if ((m_selection.count() == 1) && (m_selection[0].url() == KUrl(source))) {
 236             m_selection[0] = m_fileItem;
 237             // Implementation note: Updating the selection is only required if exactly one
 238             // item is selected, as the name of the item is shown. If this should change
 239             // in future: Before parsing the whole selection take care to test possible
 240             // performance bottlenecks when renaming several hundreds of files.
 241         }
 242
 243         showItemInfo();
 244     }
 245 }
 246
 247 void InformationPanel::slotFilesAdded(const QString& directory)
 248 {
 249     if (m_shownUrl == KUrl(directory)) {
 250         // If the 'trash' icon changes because the trash has been emptied or got filled,
 251         // the signal filesAdded("trash:/") will be emitted.
 252         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 253         requestDelayedItemInfo(item);
 254     }
 255 }
 256
 257 void InformationPanel::slotFilesChanged(const QStringList& files)
 258 {
 259     foreach (const QString& fileName, files) {
 260         if (m_shownUrl == KUrl(fileName)) {
 261             showItemInfo();
 262             break;
 263         }
 264     }
 265 }
 266
 267 void InformationPanel::slotFilesRemoved(const QStringList& files)
 268 {
 269     foreach (const QString& fileName, files) {
 270         if (m_shownUrl == KUrl(fileName)) {
 271             // the currently shown item has been removed, show
 272             // the parent directory as fallback
 273             markUrlAsInvalid();
 274             break;
 275         }
 276     }
 277 }
 278
 279 void InformationPanel::slotEnteredDirectory(const QString& directory)
 280 {
 281     if (m_shownUrl == KUrl(directory)) {
 282         KFileItem item(KFileItem::Unknown, KFileItem::Unknown, KUrl(directory));
 283         requestDelayedItemInfo(item);
 284     }
 285 }
 286
 287 void InformationPanel::slotLeftDirectory(const QString& directory)
 288 {
 289     if (m_shownUrl == KUrl(directory)) {
 290         // The signal 'leftDirectory' is also emitted when a media
 291         // has been unmounted. In this case no directory change will be
 292         // done in Dolphin, but the Information Panel must be updated to
 293         // indicate an invalid directory.
 294         markUrlAsInvalid();
 295     }
 296 }
 297
 298 void InformationPanel::cancelRequest()
 299 {
 300     delete m_folderStatJob;
 301     m_folderStatJob = 0;
 302
 303     m_infoTimer->stop();
 304     m_resetUrlTimer->stop();
 305     // Don't reset m_urlChangedTimer. As it is assured that the timeout of m_urlChangedTimer
 306     // has the smallest interval (see init()), it is not possible that the exceeded timer
 307     // would overwrite an information provided by a selection or hovering.
 308
 309     m_invalidUrlCandidate.clear();
 310     m_urlCandidate.clear();
 311 }
 312
 313 bool InformationPanel::isEqualToShownUrl(const KUrl& url) const
 314 {
 315     return m_shownUrl.equals(url, KUrl::CompareWithoutTrailingSlash);
 316 }
 317
 318 void InformationPanel::markUrlAsInvalid()
 319 {
 320     m_invalidUrlCandidate = m_shownUrl;
 321     m_resetUrlTimer->start();
 322 }
 323
 324 void InformationPanel::init()
 325 {
 326     m_infoTimer = new QTimer(this);
 327     m_infoTimer->setInterval(300);
 328     m_infoTimer->setSingleShot(true);
 329     connect(m_infoTimer, SIGNAL(timeout()),
 330             this, SLOT(slotInfoTimeout()));
 331
 332     m_urlChangedTimer = new QTimer(this);
 333     m_urlChangedTimer->setInterval(200);
 334     m_urlChangedTimer->setSingleShot(true);
 335     connect(m_urlChangedTimer, SIGNAL(timeout()),
 336             this, SLOT(showItemInfo()));
 337
 338     m_resetUrlTimer = new QTimer(this);
 339     m_resetUrlTimer->setInterval(1000);
 340     m_resetUrlTimer->setSingleShot(true);
 341     connect(m_resetUrlTimer, SIGNAL(timeout()),
 342             this, SLOT(reset()));
 343
 344     Q_ASSERT(m_urlChangedTimer->interval() < m_infoTimer->interval());
 345     Q_ASSERT(m_urlChangedTimer->interval() < m_resetUrlTimer->interval());
 346
 347     org::kde::KDirNotify* dirNotify = new org::kde::KDirNotify(QString(), QString(),
 348                                                                QDBusConnection::sessionBus(), this);
 349     connect(dirNotify, SIGNAL(FileRenamed(QString,QString)), SLOT(slotFileRenamed(QString,QString)));
 350     connect(dirNotify, SIGNAL(FilesAdded(QString)), SLOT(slotFilesAdded(QString)));
 351     connect(dirNotify, SIGNAL(FilesChanged(QStringList)), SLOT(slotFilesChanged(QStringList)));
 352     connect(dirNotify, SIGNAL(FilesRemoved(QStringList)), SLOT(slotFilesRemoved(QStringList)));
 353     connect(dirNotify, SIGNAL(enteredDirectory(QString)), SLOT(slotEnteredDirectory(QString)));
 354     connect(dirNotify, SIGNAL(leftDirectory(QString)), SLOT(slotLeftDirectory(QString)));
 355
 356     m_content = new InformationPanelContent(this);
 357     connect(m_content, SIGNAL(urlActivated(KUrl)), this, SIGNAL(urlActivated(KUrl)));
 358
 359     QVBoxLayout* layout = new QVBoxLayout(this);
 360     layout->setContentsMargins(0, 0, 0, 0);
 361     layout->addWidget(m_content);
 362
 363     m_initialized = true;
 364 }
 365
 366 #include "informationpanel.moc"