src/dolphincolumnviewcontainer.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2007-2009 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 "dolphincolumnviewcontainer.h"
  21
  22 #include "dolphin_columnmodesettings.h"
  23
  24 #include "dolphincolumnview.h"
  25 #include "dolphinviewcontroller.h"
  26 #include "dolphinsortfilterproxymodel.h"
  27 #include "draganddrophelper.h"
  28 #include "settings/dolphinsettings.h"
  29 #include "viewmodecontroller.h"
  30
  31 #include <QPoint>
  32 #include <QScrollBar>
  33 #include <QTimeLine>
  34 #include <QTimer>
  35
  36 DolphinColumnViewContainer::DolphinColumnViewContainer(QWidget* parent,
  37                                                        DolphinViewController* dolphinViewController,
  38                                                        const ViewModeController* viewModeController) :
  39     QScrollArea(parent),
  40     m_dolphinViewController(dolphinViewController),
  41     m_viewModeController(viewModeController),
  42     m_active(false),
  43     m_index(-1),
  44     m_contentX(0),
  45     m_columns(),
  46     m_emptyViewport(0),
  47     m_animation(0),
  48     m_dragSource(0),
  49     m_activeUrlTimer(0)
  50 {
  51     Q_ASSERT(dolphinViewController != 0);
  52     Q_ASSERT(viewModeController != 0);
  53
  54     setAcceptDrops(true);
  55     setFocusPolicy(Qt::NoFocus);
  56     setFrameShape(QFrame::NoFrame);
  57     setLayoutDirection(Qt::LeftToRight);
  58
  59     connect(viewModeController, SIGNAL(activationChanged(bool)),
  60             this, SLOT(updateColumnsBackground(bool)));
  61
  62     connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
  63             this, SLOT(moveContentHorizontally(int)));
  64
  65     m_animation = new QTimeLine(500, this);
  66     connect(m_animation, SIGNAL(frameChanged(int)), horizontalScrollBar(), SLOT(setValue(int)));
  67
  68     m_activeUrlTimer = new QTimer(this);
  69     m_activeUrlTimer->setSingleShot(true);
  70     m_activeUrlTimer->setInterval(200);
  71     connect(m_activeUrlTimer, SIGNAL(timeout()),
  72             this, SLOT(updateActiveUrl()));
  73
  74     DolphinColumnView* column = new DolphinColumnView(viewport(), this, viewModeController->url());
  75     m_columns.append(column);
  76     setActiveColumnIndex(0);
  77
  78     m_emptyViewport = new QFrame(viewport());
  79     m_emptyViewport->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
  80
  81     updateColumnsBackground(true);
  82
  83 }
  84
  85 DolphinColumnViewContainer::~DolphinColumnViewContainer()
  86 {
  87     delete m_dragSource;
  88     m_dragSource = 0;
  89 }
  90
  91 KUrl DolphinColumnViewContainer::rootUrl() const
  92 {
  93     return m_columns[0]->url();
  94 }
  95
  96 QAbstractItemView* DolphinColumnViewContainer::activeColumn() const
  97 {
  98     return m_columns[m_index];
  99 }
 100
 101 void DolphinColumnViewContainer::showColumn(const KUrl& url)
 102 {
 103     if (!rootUrl().isParentOf(url)) {
 104         removeAllColumns();
 105         m_columns[0]->setUrl(url);
 106         return;
 107     }
 108
 109     int columnIndex = 0;
 110     foreach (DolphinColumnView* column, m_columns) {
 111         if (column->url() == url) {
 112             // the column represents already the requested URL, hence activate it
 113             requestActivation(column);
 114             layoutColumns();
 115             return;
 116         } else if (!column->url().isParentOf(url)) {
 117             // the column is no parent of the requested URL, hence
 118             // just delete all remaining columns
 119             if (columnIndex > 0) {
 120                 QList<DolphinColumnView*>::iterator start = m_columns.begin() + columnIndex;
 121                 QList<DolphinColumnView*>::iterator end = m_columns.end();
 122                 for (QList<DolphinColumnView*>::iterator it = start; it != end; ++it) {
 123                     deleteColumn(*it);
 124                 }
 125                 m_columns.erase(start, end);
 126
 127                 const int maxIndex = m_columns.count() - 1;
 128                 Q_ASSERT(maxIndex >= 0);
 129                 if (m_index > maxIndex) {
 130                     m_index = maxIndex;
 131                 }
 132                 break;
 133             }
 134         }
 135         ++columnIndex;
 136     }
 137
 138     // Create missing columns. Assuming that the path is "/home/peter/Temp/" and
 139     // the target path is "/home/peter/Temp/a/b/c/", then the columns "a", "b" and
 140     // "c" will be created.
 141     const int lastIndex = m_columns.count() - 1;
 142     Q_ASSERT(lastIndex >= 0);
 143
 144     const KUrl& activeUrl = m_columns[lastIndex]->url();
 145     Q_ASSERT(activeUrl.isParentOf(url));
 146     Q_ASSERT(activeUrl != url);
 147
 148     QString path = activeUrl.url(KUrl::AddTrailingSlash);
 149     const QString targetPath = url.url(KUrl::AddTrailingSlash);
 150
 151     columnIndex = lastIndex;
 152     int slashIndex = path.count('/');
 153     bool hasSubPath = (slashIndex >= 0);
 154     while (hasSubPath) {
 155         const QString subPath = targetPath.section('/', slashIndex, slashIndex);
 156         if (subPath.isEmpty()) {
 157             hasSubPath = false;
 158         } else {
 159             path += subPath + '/';
 160             ++slashIndex;
 161
 162             const KUrl childUrl = KUrl(path);
 163             m_columns[columnIndex]->setChildUrl(childUrl);
 164             columnIndex++;
 165
 166             DolphinColumnView* column = new DolphinColumnView(viewport(), this, childUrl);
 167             m_columns.append(column);
 168
 169             // Before invoking layoutColumns() the column must be set visible temporary.
 170             // To prevent a flickering the initial geometry is set to a hidden position.
 171             column->setGeometry(QRect(-1, -1, 1, 1));
 172             column->show();
 173             layoutColumns();
 174             updateScrollBar();
 175         }
 176     }
 177
 178     // set the last column as active column without modifying the controller
 179     // and hence the history
 180     m_columns[m_index]->setActive(false);
 181     m_index = columnIndex;
 182     m_columns[m_index]->setActive(true);
 183     assureVisibleActiveColumn();
 184 }
 185
 186 void DolphinColumnViewContainer::mousePressEvent(QMouseEvent* event)
 187 {
 188     m_dolphinViewController->requestActivation();
 189     QScrollArea::mousePressEvent(event);
 190 }
 191
 192 void DolphinColumnViewContainer::keyPressEvent(QKeyEvent* event)
 193 {
 194     if (event->key() == Qt::Key_Left) {
 195         setActiveColumnIndex(m_index - 1);
 196     } else {
 197         QScrollArea::keyPressEvent(event);
 198     }
 199 }
 200
 201 void DolphinColumnViewContainer::resizeEvent(QResizeEvent* event)
 202 {
 203     QScrollArea::resizeEvent(event);
 204     layoutColumns();
 205     updateScrollBar();
 206     assureVisibleActiveColumn();
 207 }
 208
 209 void DolphinColumnViewContainer::wheelEvent(QWheelEvent* event)
 210 {
 211     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 212     if ((event->modifiers() & Qt::ControlModifier) == Qt::ControlModifier) {
 213         event->ignore();
 214     } else {
 215         QScrollArea::wheelEvent(event);
 216     }
 217 }
 218
 219 void DolphinColumnViewContainer::moveContentHorizontally(int x)
 220 {
 221     m_contentX = isRightToLeft() ? +x : -x;
 222     layoutColumns();
 223 }
 224
 225 void DolphinColumnViewContainer::updateColumnsBackground(bool active)
 226 {
 227     if (active == m_active) {
 228         return;
 229     }
 230
 231     m_active = active;
 232
 233     // dim the background of the viewport
 234     const QPalette::ColorRole role = viewport()->backgroundRole();
 235     QColor background = viewport()->palette().color(role);
 236     background.setAlpha(0);  // make background transparent
 237
 238     QPalette palette = viewport()->palette();
 239     palette.setColor(role, background);
 240     viewport()->setPalette(palette);
 241
 242     foreach (DolphinColumnView* column, m_columns) {
 243         column->updateBackground();
 244     }
 245 }
 246
 247 void DolphinColumnViewContainer::updateActiveUrl()
 248 {
 249     const KUrl activeUrl = m_columns[m_index]->url();
 250     m_dolphinViewController->requestUrlChange(activeUrl);
 251 }
 252
 253 void DolphinColumnViewContainer::setActiveColumnIndex(int index)
 254 {
 255     if ((m_index == index) || (index < 0) || (index >= m_columns.count())) {
 256         return;
 257     }
 258
 259     const bool hasActiveColumn = (m_index >= 0);
 260     if (hasActiveColumn) {
 261         m_columns[m_index]->setActive(false);
 262     }
 263
 264     m_index = index;
 265     m_columns[m_index]->setActive(true);
 266
 267     assureVisibleActiveColumn();
 268     m_activeUrlTimer->start(); // calls slot updateActiveUrl()
 269 }
 270
 271 void DolphinColumnViewContainer::layoutColumns()
 272 {
 273     const int gap = 4;
 274
 275     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 276     const int columnWidth = settings->columnWidth();
 277
 278     QRect emptyViewportRect;
 279     if (isRightToLeft()) {
 280         int x = viewport()->width() - columnWidth + m_contentX;
 281         foreach (DolphinColumnView* column, m_columns) {
 282             column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
 283             x -= columnWidth;
 284         }
 285         emptyViewportRect = QRect(0, 0, x + columnWidth - gap, viewport()->height());
 286     } else {
 287         int x = m_contentX;
 288         foreach (DolphinColumnView* column, m_columns) {
 289             column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
 290             x += columnWidth;
 291         }
 292         emptyViewportRect = QRect(x, 0, viewport()->width() - x - gap, viewport()->height());
 293     }
 294
 295     if (emptyViewportRect.isValid()) {
 296         m_emptyViewport->show();
 297         m_emptyViewport->setGeometry(emptyViewportRect);
 298     } else {
 299         m_emptyViewport->hide();
 300     }
 301 }
 302
 303 void DolphinColumnViewContainer::updateScrollBar()
 304 {
 305     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 306     const int contentWidth = m_columns.count() * settings->columnWidth();
 307
 308     horizontalScrollBar()->setPageStep(contentWidth);
 309     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 310 }
 311
 312 void DolphinColumnViewContainer::assureVisibleActiveColumn()
 313 {
 314     const int viewportWidth = viewport()->width();
 315     const int x = activeColumn()->x();
 316
 317     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 318     const int width = settings->columnWidth();
 319
 320     if (x + width > viewportWidth) {
 321         const int newContentX = m_contentX - x - width + viewportWidth;
 322         if (isRightToLeft()) {
 323             m_animation->setFrameRange(m_contentX, newContentX);
 324         } else {
 325             m_animation->setFrameRange(-m_contentX, -newContentX);
 326         }
 327         if (m_animation->state() != QTimeLine::Running) {
 328            m_animation->start();
 329         }
 330     } else if (x < 0) {
 331         const int newContentX = m_contentX - x;
 332         if (isRightToLeft()) {
 333             m_animation->setFrameRange(m_contentX, newContentX);
 334         } else {
 335             m_animation->setFrameRange(-m_contentX, -newContentX);
 336         }
 337         if (m_animation->state() != QTimeLine::Running) {
 338            m_animation->start();
 339         }
 340     }
 341 }
 342
 343 void DolphinColumnViewContainer::requestActivation(DolphinColumnView* column)
 344 {
 345     m_dolphinViewController->setItemView(column);
 346     if (column->isActive()) {
 347         assureVisibleActiveColumn();
 348     } else {
 349         int index = 0;
 350         foreach (DolphinColumnView* currColumn, m_columns) {
 351             if (currColumn == column) {
 352                 setActiveColumnIndex(index);
 353                 return;
 354             }
 355             ++index;
 356         }
 357     }
 358 }
 359
 360 void DolphinColumnViewContainer::removeAllColumns()
 361 {
 362     QList<DolphinColumnView*>::iterator start = m_columns.begin() + 1;
 363     QList<DolphinColumnView*>::iterator end = m_columns.end();
 364     for (QList<DolphinColumnView*>::iterator it = start; it != end; ++it) {
 365         deleteColumn(*it);
 366     }
 367     m_columns.erase(start, end);
 368     m_index = 0;
 369     m_columns[0]->setActive(true);
 370     assureVisibleActiveColumn();
 371 }
 372
 373 QPoint DolphinColumnViewContainer::columnPosition(DolphinColumnView* column, const QPoint& point) const
 374 {
 375     const QPoint topLeft = column->frameGeometry().topLeft();
 376     return QPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
 377 }
 378
 379 void DolphinColumnViewContainer::deleteColumn(DolphinColumnView* column)
 380 {
 381     if (column == 0) {
 382         return;
 383     }
 384
 385     if (m_dolphinViewController->itemView() == column) {
 386         m_dolphinViewController->setItemView(0);
 387     }
 388     // deleteWhenNotDragSource(column) does not necessarily delete column,
 389     // and we want its preview generator destroyed immediately.
 390     column->hide();
 391     // Prevent automatic destruction of column when this DolphinColumnViewContainer
 392     // is destroyed.
 393     column->setParent(0);
 394     column->disconnect();
 395
 396     if (DragAndDropHelper::instance().isDragSource(column)) {
 397         // The column is a drag source (the feature "Open folders
 398         // during drag operations" is used). Deleting the view
 399         // during an ongoing drag operation is not allowed, so
 400         // this will postponed.
 401         if (m_dragSource != 0) {
 402             // the old stored view is obviously not the drag source anymore
 403             m_dragSource->deleteLater();
 404             m_dragSource = 0;
 405         }
 406         column->hide();
 407         column->setParent(0);
 408         column->disconnect();
 409
 410         m_dragSource = column;
 411     } else {
 412         column->deleteLater();
 413     }
 414 }
 415
 416 #include "dolphincolumnviewcontainer.moc"