src/views/tooltips/tooltipmanager.cpp

   1 /*******************************************************************************
   2  *   Copyright (C) 2008 by Konstantin Heil <konst.heil@stud.uni-heidelberg.de> *
   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 "tooltipmanager.h"
  21
  22 #include "dolphinfilemetadatawidget.h"
  23
  24 #include <KIO/JobUiDelegate>
  25 #include <KIO/PreviewJob>
  26 #include <KJobWidgets>
  27 #include <KToolTipWidget>
  28 #include <KIconLoader>
  29
  30 #include <QApplication>
  31 #include <QDesktopWidget>
  32 #include <QIcon>
  33 #include <QLayout>
  34 #include <QStyle>
  35 #include <QTimer>
  36 #include <QWindow>
  37
  38 class IconLoaderSingleton {
  39 public:
  40     IconLoaderSingleton() = default;
  41
  42     KIconLoader self;
  43 };
  44
  45 Q_GLOBAL_STATIC(IconLoaderSingleton, iconLoader)
  46
  47 ToolTipManager::ToolTipManager(QWidget* parent) :
  48     QObject(parent),
  49     m_showToolTipTimer(nullptr),
  50     m_contentRetrievalTimer(nullptr),
  51     m_transientParent(nullptr),
  52     m_fileMetaDataWidget(nullptr),
  53     m_toolTipRequested(false),
  54     m_metaDataRequested(false),
  55     m_appliedWaitCursor(false),
  56     m_margin(4),
  57     m_item(),
  58     m_itemRect()
  59 {
  60     if (parent) {
  61         m_margin = qMax(m_margin, parent->style()->pixelMetric(QStyle::PM_ToolTipLabelFrameWidth));
  62     }
  63
  64     m_showToolTipTimer = new QTimer(this);
  65     m_showToolTipTimer->setSingleShot(true);
  66     m_showToolTipTimer->setInterval(500);
  67     connect(m_showToolTipTimer, &QTimer::timeout, this, QOverload<>::of(&ToolTipManager::showToolTip));
  68
  69     m_contentRetrievalTimer = new QTimer(this);
  70     m_contentRetrievalTimer->setSingleShot(true);
  71     m_contentRetrievalTimer->setInterval(200);
  72     connect(m_contentRetrievalTimer, &QTimer::timeout, this, &ToolTipManager::startContentRetrieval);
  73
  74     Q_ASSERT(m_contentRetrievalTimer->interval() < m_showToolTipTimer->interval());
  75 }
  76
  77 ToolTipManager::~ToolTipManager()
  78 {
  79 }
  80
  81 void ToolTipManager::showToolTip(const KFileItem& item, const QRectF& itemRect, QWindow *transientParent)
  82 {
  83     hideToolTip();
  84
  85     m_itemRect = itemRect.toRect();
  86
  87     m_itemRect.adjust(-m_margin, -m_margin, m_margin, m_margin);
  88     m_item = item;
  89
  90     m_transientParent = transientParent;
  91
  92     // Only start the retrieving of the content, when the mouse has been over this
  93     // item for 200 milliseconds. This prevents a lot of useless preview jobs and
  94     // meta data retrieval, when passing rapidly over a lot of items.
  95     m_fileMetaDataWidget.reset(new DolphinFileMetaDataWidget());
  96     connect(m_fileMetaDataWidget.data(), &DolphinFileMetaDataWidget::metaDataRequestFinished,
  97             this, &ToolTipManager::slotMetaDataRequestFinished);
  98     connect(m_fileMetaDataWidget.data(), &DolphinFileMetaDataWidget::urlActivated,
  99             this, &ToolTipManager::urlActivated);
 100
 101     m_contentRetrievalTimer->start();
 102     m_showToolTipTimer->start();
 103     m_toolTipRequested = true;
 104     Q_ASSERT(!m_metaDataRequested);
 105 }
 106
 107 void ToolTipManager::hideToolTip()
 108 {
 109     if (m_appliedWaitCursor) {
 110         QApplication::restoreOverrideCursor();
 111         m_appliedWaitCursor = false;
 112     }
 113
 114     m_toolTipRequested = false;
 115     m_metaDataRequested = false;
 116     m_showToolTipTimer->stop();
 117     m_contentRetrievalTimer->stop();
 118     if (m_tooltipWidget) {
 119         m_tooltipWidget->hideLater();
 120     }
 121 }
 122
 123 void ToolTipManager::startContentRetrieval()
 124 {
 125     if (!m_toolTipRequested) {
 126         return;
 127     }
 128
 129     m_fileMetaDataWidget->setName(m_item.text());
 130
 131     // Request the retrieval of meta-data. The slot
 132     // slotMetaDataRequestFinished() is invoked after the
 133     // meta-data have been received.
 134     m_metaDataRequested = true;
 135     m_fileMetaDataWidget->setItems(KFileItemList() << m_item);
 136     m_fileMetaDataWidget->adjustSize();
 137
 138     // Request a preview of the item
 139     m_fileMetaDataWidget->setPreview(QPixmap());
 140
 141     QStringList plugins = KIO::PreviewJob::availablePlugins();
 142     KIO::PreviewJob* job = new KIO::PreviewJob(KFileItemList() << m_item,
 143                                                QSize(256, 256),
 144                                                &plugins);
 145     job->setIgnoreMaximumSize(m_item.isLocalFile());
 146     if (job->uiDelegate()) {
 147         KJobWidgets::setWindow(job, qApp->activeWindow());
 148     }
 149
 150     connect(job, &KIO::PreviewJob::gotPreview,
 151             this, &ToolTipManager::setPreviewPix);
 152     connect(job, &KIO::PreviewJob::failed,
 153             this, &ToolTipManager::previewFailed);
 154 }
 155
 156
 157 void ToolTipManager::setPreviewPix(const KFileItem& item,
 158                                    const QPixmap& pixmap)
 159 {
 160     if (!m_toolTipRequested || (m_item.url() != item.url())) {
 161         // No tooltip is requested anymore or an old preview has been received
 162         return;
 163     }
 164
 165     if (pixmap.isNull()) {
 166         previewFailed();
 167     } else {
 168         m_fileMetaDataWidget->setPreview(pixmap);
 169         if (!m_showToolTipTimer->isActive()) {
 170             showToolTip();
 171         }
 172     }
 173 }
 174
 175 void ToolTipManager::previewFailed()
 176 {
 177     if (!m_toolTipRequested) {
 178         return;
 179     }
 180     QPalette pal;
 181     for (auto state : { QPalette::Active, QPalette::Inactive, QPalette::Disabled }) {
 182         pal.setBrush(state, QPalette::WindowText, pal.toolTipText());
 183         pal.setBrush(state, QPalette::Window, pal.toolTipBase());
 184     }
 185     iconLoader->self.setCustomPalette(pal);
 186     const QPixmap pixmap = KDE::icon(m_item.iconName(), &iconLoader->self).pixmap(128, 128);
 187     m_fileMetaDataWidget->setPreview(pixmap);
 188     if (!m_showToolTipTimer->isActive()) {
 189         showToolTip();
 190     }
 191 }
 192
 193 void ToolTipManager::slotMetaDataRequestFinished()
 194 {
 195     if (!m_toolTipRequested) {
 196         return;
 197     }
 198
 199     m_metaDataRequested = false;
 200
 201     if (!m_showToolTipTimer->isActive()) {
 202         showToolTip();
 203     }
 204 }
 205
 206 void ToolTipManager::showToolTip()
 207 {
 208     Q_ASSERT(m_toolTipRequested);
 209     if (m_appliedWaitCursor) {
 210         QApplication::restoreOverrideCursor();
 211         m_appliedWaitCursor = false;
 212     }
 213
 214     if (m_fileMetaDataWidget->preview().isNull() || m_metaDataRequested) {
 215         Q_ASSERT(!m_appliedWaitCursor);
 216         QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
 217         m_appliedWaitCursor = true;
 218         return;
 219     }
 220
 221     // Adjust the size to get a proper sizeHint()
 222     m_fileMetaDataWidget->adjustSize();
 223     if (!m_tooltipWidget) {
 224         m_tooltipWidget.reset(new KToolTipWidget());
 225     }
 226     m_tooltipWidget->showBelow(m_itemRect, m_fileMetaDataWidget.data(), m_transientParent);
 227     m_toolTipRequested = false;
 228 }
 229