src/dolphincolumnview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2007 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 "dolphincolumnview.h"
  21
  22 #include "dolphinmodel.h"
  23 #include "dolphincontroller.h"
  24 #include "dolphinsettings.h"
  25
  26 #include "dolphin_columnmodesettings.h"
  27
  28 #include <kcolorutils.h>
  29 #include <kcolorscheme.h>
  30 #include <kdirlister.h>
  31
  32 #include <QAbstractProxyModel>
  33 #include <QApplication>
  34 #include <QPoint>
  35 #include <QScrollBar>
  36 #include <QTimer>
  37 #include <QTimeLine>
  38
  39 /**
  40  * Represents one column inside the DolphinColumnView and has been
  41  * extended to respect view options and hovering information.
  42  */
  43 class ColumnWidget : public QListView
  44 {
  45 public:
  46     ColumnWidget(QWidget* parent,
  47                  DolphinColumnView* columnView,
  48                  const KUrl& url);
  49     virtual ~ColumnWidget();
  50
  51     /** Sets the size of the icons. */
  52     void setDecorationSize(const QSize& size);
  53
  54     /**
  55      * An active column is defined as column, which shows the same URL
  56      * as indicated by the URL navigator. The active column is usually
  57      * drawn in a lighter color. All operations are applied to this column.
  58      */
  59     void setActive(bool active);
  60     bool isActive() const;
  61
  62     /**
  63      * Sets the directory URL of the child column that is shown next to
  64      * this column. This property is only used for a visual indication
  65      * of the shown directory, it does not trigger a loading of the model.
  66      */
  67     void setChildUrl(const KUrl& url);
  68     const KUrl& childUrl() const;
  69
  70     /** Sets the directory URL that is shown inside the column widget. */
  71     void setUrl(const KUrl& url);
  72
  73     /** Returns the directory URL that is shown inside the column widget. */
  74     const KUrl& url() const;
  75
  76 protected:
  77     virtual QStyleOptionViewItem viewOptions() const;
  78     virtual void dragEnterEvent(QDragEnterEvent* event);
  79     virtual void dragLeaveEvent(QDragLeaveEvent* event);
  80     virtual void dragMoveEvent(QDragMoveEvent* event);
  81     virtual void dropEvent(QDropEvent* event);
  82     virtual void paintEvent(QPaintEvent* event);
  83     virtual void mousePressEvent(QMouseEvent* event);
  84     virtual void keyPressEvent(QKeyEvent* event);
  85     virtual void contextMenuEvent(QContextMenuEvent* event);
  86     virtual void selectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
  87
  88 private:
  89     /** Used by ColumnWidget::setActive(). */
  90     void activate();
  91
  92     /** Used by ColumnWidget::setActive(). */
  93     void deactivate();
  94
  95 private:
  96     bool m_active;
  97     DolphinColumnView* m_view;
  98     KUrl m_url;      // URL of the directory that is shown
  99     KUrl m_childUrl; // URL of the next column that is shown
 100     QStyleOptionViewItem m_viewOptions;
 101
 102     bool m_dragging;   // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 103     QRect m_dropRect;  // TODO: remove this property when the issue #160611 is solved in Qt 4.4
 104 };
 105
 106 ColumnWidget::ColumnWidget(QWidget* parent,
 107                            DolphinColumnView* columnView,
 108                            const KUrl& url) :
 109     QListView(parent),
 110     m_active(true),
 111     m_view(columnView),
 112     m_url(url),
 113     m_childUrl(),
 114     m_dragging(false),
 115     m_dropRect()
 116 {
 117     setMouseTracking(true);
 118     viewport()->setAttribute(Qt::WA_Hover);
 119     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 120     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 121     setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
 122     setSelectionBehavior(SelectItems);
 123     setSelectionMode(QAbstractItemView::ExtendedSelection);
 124     setDragDropMode(QAbstractItemView::DragDrop);
 125     setDropIndicatorShown(false);
 126     setFocusPolicy(Qt::NoFocus);
 127
 128     // apply the column mode settings to the widget
 129     const ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 130     Q_ASSERT(settings != 0);
 131
 132     m_viewOptions = QListView::viewOptions();
 133
 134     QFont font(settings->fontFamily(), settings->fontSize());
 135     font.setItalic(settings->italicFont());
 136     font.setBold(settings->boldFont());
 137     m_viewOptions.font = font;
 138
 139     const int iconSize = settings->iconSize();
 140     m_viewOptions.decorationSize = QSize(iconSize, iconSize);
 141
 142     m_viewOptions.showDecorationSelected = true;
 143
 144     KFileItemDelegate* delegate = new KFileItemDelegate(this);
 145     setItemDelegate(delegate);
 146
 147     activate();
 148
 149     connect(this, SIGNAL(entered(const QModelIndex&)),
 150             m_view->m_controller, SLOT(emitItemEntered(const QModelIndex&)));
 151     connect(this, SIGNAL(viewportEntered()),
 152             m_view->m_controller, SLOT(emitViewportEntered()));
 153 }
 154
 155 ColumnWidget::~ColumnWidget()
 156 {
 157 }
 158
 159 void ColumnWidget::setDecorationSize(const QSize& size)
 160 {
 161     m_viewOptions.decorationSize = size;
 162     doItemsLayout();
 163 }
 164
 165 void ColumnWidget::setActive(bool active)
 166 {
 167     if (m_active == active) {
 168         return;
 169     }
 170
 171     m_active = active;
 172
 173     if (active) {
 174         activate();
 175     } else {
 176         deactivate();
 177     }
 178 }
 179
 180 inline bool ColumnWidget::isActive() const
 181 {
 182     return m_active;
 183 }
 184
 185 inline void ColumnWidget::setChildUrl(const KUrl& url)
 186 {
 187     m_childUrl = url;
 188 }
 189
 190 inline const KUrl& ColumnWidget::childUrl() const
 191 {
 192     return m_childUrl;
 193 }
 194
 195 inline void ColumnWidget::setUrl(const KUrl& url)
 196 {
 197     m_url = url;
 198 }
 199
 200 inline const KUrl& ColumnWidget::url() const
 201 {
 202     return m_url;
 203 }
 204
 205 inline QStyleOptionViewItem ColumnWidget::viewOptions() const
 206 {
 207     return m_viewOptions;
 208 }
 209
 210 void ColumnWidget::dragEnterEvent(QDragEnterEvent* event)
 211 {
 212     if (event->mimeData()->hasUrls()) {
 213         event->acceptProposedAction();
 214     }
 215
 216     m_dragging = true;
 217 }
 218
 219 void ColumnWidget::dragLeaveEvent(QDragLeaveEvent* event)
 220 {
 221     QListView::dragLeaveEvent(event);
 222
 223     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 224     m_dragging = false;
 225     setDirtyRegion(m_dropRect);
 226 }
 227
 228 void ColumnWidget::dragMoveEvent(QDragMoveEvent* event)
 229 {
 230     QListView::dragMoveEvent(event);
 231
 232     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 233     const QModelIndex index = indexAt(event->pos());
 234     setDirtyRegion(m_dropRect);
 235     m_dropRect = visualRect(index);
 236     setDirtyRegion(m_dropRect);
 237 }
 238
 239 void ColumnWidget::dropEvent(QDropEvent* event)
 240 {
 241     const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 242     if (!urls.isEmpty()) {
 243         event->acceptProposedAction();
 244         m_view->m_controller->indicateDroppedUrls(urls,
 245                                                   url(),
 246                                                   indexAt(event->pos()),
 247                                                   event->source());
 248     }
 249     QListView::dropEvent(event);
 250     m_dragging = false;
 251 }
 252
 253 void ColumnWidget::paintEvent(QPaintEvent* event)
 254 {
 255     if (!m_childUrl.isEmpty()) {
 256         // indicate the shown URL of the next column by highlighting the shown folder item
 257         const QModelIndex dirIndex = m_view->m_dolphinModel->indexForUrl(m_childUrl);
 258         const QModelIndex proxyIndex = m_view->m_proxyModel->mapFromSource(dirIndex);
 259         if (proxyIndex.isValid() && !selectionModel()->isSelected(proxyIndex)) {
 260             const QRect itemRect = visualRect(proxyIndex);
 261             QPainter painter(viewport());
 262             painter.save();
 263
 264             QColor color = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 265             color.setAlpha(32);
 266             painter.setPen(Qt::NoPen);
 267             painter.setBrush(color);
 268             painter.drawRect(itemRect);
 269
 270             painter.restore();
 271         }
 272     }
 273
 274     QListView::paintEvent(event);
 275
 276     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 277     if (m_dragging) {
 278         const QBrush& brush = m_viewOptions.palette.brush(QPalette::Normal, QPalette::Highlight);
 279         DolphinController::drawHoverIndication(viewport(), m_dropRect, brush);
 280     }
 281 }
 282
 283 void ColumnWidget::mousePressEvent(QMouseEvent* event)
 284 {
 285     if (!m_active) {
 286         m_view->requestActivation(this);
 287     }
 288
 289     QListView::mousePressEvent(event);
 290 }
 291
 292 void ColumnWidget::keyPressEvent(QKeyEvent* event)
 293 {
 294     QListView::keyPressEvent(event);
 295
 296     const QItemSelectionModel* selModel = selectionModel();
 297     const QModelIndex currentIndex = selModel->currentIndex();
 298     const bool triggerItem = currentIndex.isValid()
 299                              && (event->key() == Qt::Key_Return)
 300                              && (selModel->selectedIndexes().count() <= 1);
 301     if (triggerItem) {
 302         m_view->m_controller->triggerItem(currentIndex);
 303     }
 304 }
 305
 306 void ColumnWidget::contextMenuEvent(QContextMenuEvent* event)
 307 {
 308     if (!m_active) {
 309         m_view->requestActivation(this);
 310     }
 311
 312     QListView::contextMenuEvent(event);
 313
 314     const QModelIndex index = indexAt(event->pos());
 315     if (index.isValid() || m_active) {
 316         // Only open a context menu above an item or if the mouse is above
 317         // the active column.
 318         const QPoint pos = m_view->viewport()->mapFromGlobal(event->globalPos());
 319         m_view->m_controller->triggerContextMenuRequest(pos);
 320     }
 321 }
 322
 323 void ColumnWidget::selectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
 324 {
 325     QListView::selectionChanged(selected, deselected);
 326
 327     QItemSelectionModel* selModel = m_view->selectionModel();
 328     selModel->select(selected, QItemSelectionModel::Select);
 329     selModel->select(deselected, QItemSelectionModel::Deselect);
 330 }
 331
 332 void ColumnWidget::activate()
 333 {
 334     if (m_view->hasFocus()) {
 335         setFocus(Qt::OtherFocusReason);
 336     }
 337     m_view->setFocusProxy(this);
 338
 339     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 340     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 341     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 342     if (KGlobalSettings::singleClick()) {
 343         connect(this, SIGNAL(clicked(const QModelIndex&)),
 344                 m_view->m_controller, SLOT(triggerItem(const QModelIndex&)));
 345     } else {
 346         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 347                 m_view->m_controller, SLOT(triggerItem(const QModelIndex&)));
 348     }
 349
 350     const QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 351     QPalette palette = viewport()->palette();
 352     palette.setColor(viewport()->backgroundRole(), bgColor);
 353     viewport()->setPalette(palette);
 354
 355     if (!m_childUrl.isEmpty()) {
 356         // assure that the current index is set on the index that represents
 357         // the child URL
 358         const QModelIndex dirIndex = m_view->m_dolphinModel->indexForUrl(m_childUrl);
 359         const QModelIndex proxyIndex = m_view->m_proxyModel->mapFromSource(dirIndex);
 360         selectionModel()->setCurrentIndex(proxyIndex, QItemSelectionModel::Current);
 361     }
 362
 363     update();
 364 }
 365
 366 void ColumnWidget::deactivate()
 367 {
 368     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
 369     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
 370     // necessary connecting the signal 'singleClick()' or 'doubleClick'.
 371     if (KGlobalSettings::singleClick()) {
 372         disconnect(this, SIGNAL(clicked(const QModelIndex&)),
 373                    m_view->m_controller, SLOT(triggerItem(const QModelIndex&)));
 374     } else {
 375         disconnect(this, SIGNAL(doubleClicked(const QModelIndex&)),
 376                    m_view->m_controller, SLOT(triggerItem(const QModelIndex&)));
 377     }
 378
 379     const QPalette palette = m_view->viewport()->palette();
 380     viewport()->setPalette(palette);
 381
 382     selectionModel()->clear();
 383     update();
 384 }
 385
 386 // ---
 387
 388 DolphinColumnView::DolphinColumnView(QWidget* parent, DolphinController* controller) :
 389     QAbstractItemView(parent),
 390     m_controller(controller),
 391     m_restoreActiveColumnFocus(false),
 392     m_index(-1),
 393     m_contentX(0),
 394     m_columns(),
 395     m_animation(0),
 396     m_dolphinModel(0),
 397     m_proxyModel(0)
 398 {
 399     Q_ASSERT(controller != 0);
 400
 401     setAcceptDrops(true);
 402     setDragDropMode(QAbstractItemView::DragDrop);
 403     setDropIndicatorShown(false);
 404     setSelectionMode(ExtendedSelection);
 405
 406     connect(this, SIGNAL(entered(const QModelIndex&)),
 407             controller, SLOT(emitItemEntered(const QModelIndex&)));
 408     connect(this, SIGNAL(viewportEntered()),
 409             controller, SLOT(emitViewportEntered()));
 410     connect(controller, SIGNAL(zoomIn()),
 411             this, SLOT(zoomIn()));
 412     connect(controller, SIGNAL(zoomOut()),
 413             this, SLOT(zoomOut()));
 414     connect(controller, SIGNAL(urlChanged(const KUrl&)),
 415             this, SLOT(showColumn(const KUrl&)));
 416
 417     connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 418             this, SLOT(moveContentHorizontally(int)));
 419
 420     m_animation = new QTimeLine(500, this);
 421     connect(m_animation, SIGNAL(frameChanged(int)), horizontalScrollBar(), SLOT(setValue(int)));
 422
 423     ColumnWidget* column = new ColumnWidget(viewport(), this, m_controller->url());
 424     m_columns.append(column);
 425     setActiveColumnIndex(0);
 426
 427     updateDecorationSize();
 428
 429     // dim the background of the viewport
 430     QColor bgColor = KColorScheme(QPalette::Active, KColorScheme::View).background().color();
 431     const QColor fgColor = KColorScheme(QPalette::Active, KColorScheme::View).foreground().color();
 432     bgColor = KColorUtils::mix(bgColor, fgColor, 0.04);
 433
 434     QPalette palette = viewport()->palette();
 435     palette.setColor(viewport()->backgroundRole(), bgColor);
 436     viewport()->setPalette(palette);
 437 }
 438
 439 DolphinColumnView::~DolphinColumnView()
 440 {
 441 }
 442
 443 QModelIndex DolphinColumnView::indexAt(const QPoint& point) const
 444 {
 445     foreach (ColumnWidget* column, m_columns) {
 446         const QPoint topLeft = column->frameGeometry().topLeft();
 447         const QPoint adjustedPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
 448         const QModelIndex index = column->indexAt(adjustedPoint);
 449         if (index.isValid()) {
 450             return index;
 451         }
 452     }
 453
 454     return QModelIndex();
 455 }
 456
 457 void DolphinColumnView::scrollTo(const QModelIndex& index, ScrollHint hint)
 458 {
 459     activeColumn()->scrollTo(index, hint);
 460 }
 461
 462 QRect DolphinColumnView::visualRect(const QModelIndex& index) const
 463 {
 464     return activeColumn()->visualRect(index);
 465 }
 466
 467 void DolphinColumnView::setModel(QAbstractItemModel* model)
 468 {
 469     if (m_dolphinModel != 0) {
 470         m_dolphinModel->disconnect(this);
 471     }
 472
 473     m_proxyModel = static_cast<QAbstractProxyModel*>(model);
 474     m_dolphinModel = static_cast<DolphinModel*>(m_proxyModel->sourceModel());
 475     connect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
 476             this, SLOT(triggerReloadColumns(const QModelIndex&)));
 477
 478     KDirLister* dirLister = m_dolphinModel->dirLister();
 479     connect(dirLister, SIGNAL(completed()),
 480             this, SLOT(triggerExpandToActiveUrl()));
 481
 482     activeColumn()->setModel(model);
 483     QAbstractItemView::setModel(model);
 484 }
 485
 486 void DolphinColumnView::invertSelection()
 487 {
 488     // TODO: this approach of inverting the selection is quite slow. It should
 489     // be possible to speedup the implementation by using QItemSelection, but
 490     // all adempts have failed yet...
 491
 492     ColumnWidget* column = activeColumn();
 493     QItemSelectionModel* selModel = column->selectionModel();
 494
 495     KDirLister* dirLister = m_dolphinModel->dirLister();
 496     const KFileItemList list = dirLister->itemsForDir(column->url());
 497     foreach (const KFileItem item, list) {
 498         const QModelIndex index = m_dolphinModel->indexForUrl(item.url());
 499         selModel->select(m_proxyModel->mapFromSource(index), QItemSelectionModel::Toggle);
 500     }
 501 }
 502
 503 void DolphinColumnView::reload()
 504 {
 505     // Due to the reloading of the model all columns will be reset to show
 506     // the same content as the first column. As this is not wanted, all columns
 507     // except of the first column are temporary hidden until the root index can
 508     // be updated again.
 509     m_restoreActiveColumnFocus = false;
 510     QList<ColumnWidget*>::iterator start = m_columns.begin() + 1;
 511     QList<ColumnWidget*>::iterator end = m_columns.end();
 512     for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 513         ColumnWidget* column = (*it);
 514         if (column->isActive() && column->hasFocus()) {
 515             // because of hiding the column, it will lose the focus
 516             // -> remember that the focus should be restored after reloading
 517             m_restoreActiveColumnFocus = true;
 518         }
 519         column->hide();
 520     }
 521
 522     // all columns are hidden, now reload the directory lister
 523     KDirLister* dirLister = m_dolphinModel->dirLister();
 524     const KUrl& rootUrl = m_columns[0]->url();
 525     dirLister->openUrl(rootUrl, false, true);
 526     updateColumns();
 527 }
 528
 529 void DolphinColumnView::showColumn(const KUrl& url)
 530 {
 531     const KUrl& rootUrl = m_columns[0]->url();
 532     if (!rootUrl.isParentOf(url)) {
 533         // the URL is no child URL of the column view, hence clear all columns
 534         // and reset the root column
 535         QList<ColumnWidget*>::iterator start = m_columns.begin() + 1;
 536         QList<ColumnWidget*>::iterator end = m_columns.end();
 537         for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 538             (*it)->deleteLater();
 539         }
 540         m_columns.erase(start, end);
 541         m_index = 0;
 542         m_columns[0]->setActive(true);
 543         m_columns[0]->setUrl(url);
 544         assureVisibleActiveColumn();
 545         return;
 546     }
 547
 548     KDirLister* dirLister = m_dolphinModel->dirLister();
 549     const KUrl dirListerUrl = dirLister->url();
 550     if (dirListerUrl != rootUrl) {
 551         // It is possible that root URL of the directory lister is adjusted
 552         // after creating the column widget (e. g. when restoring the history
 553         // having a different root URL than the controller indicates).
 554         m_columns[0]->setUrl(dirListerUrl);
 555     }
 556
 557     int columnIndex = 0;
 558     foreach (ColumnWidget* column, m_columns) {
 559         if (column->url() == url) {
 560             // the column represents already the requested URL, hence activate it
 561             requestActivation(column);
 562             return;
 563         } else if (!column->url().isParentOf(url)) {
 564             // the column is no parent of the requested URL, hence
 565             // just delete all remaining columns
 566             if (columnIndex > 0) {
 567                 QList<ColumnWidget*>::iterator start = m_columns.begin() + columnIndex;
 568                 QList<ColumnWidget*>::iterator end = m_columns.end();
 569                 for (QList<ColumnWidget*>::iterator it = start; it != end; ++it) {
 570                     (*it)->deleteLater();
 571                 }
 572                 m_columns.erase(start, end);
 573
 574                 const int maxIndex = m_columns.count() - 1;
 575                 Q_ASSERT(maxIndex >= 0);
 576                 if (m_index > maxIndex) {
 577                     m_index = maxIndex;
 578                 }
 579                 break;
 580             }
 581         }
 582         ++columnIndex;
 583     }
 584
 585     // Create missing columns. Assuming that the path is "/home/peter/Temp/" and
 586     // the target path is "/home/peter/Temp/a/b/c/", then the columns "a", "b" and
 587     // "c" will be created.
 588     const int lastIndex = m_columns.count() - 1;
 589     Q_ASSERT(lastIndex >= 0);
 590
 591     const KUrl& activeUrl = m_columns[lastIndex]->url();
 592     Q_ASSERT(activeUrl.isParentOf(url));
 593     Q_ASSERT(activeUrl != url);
 594
 595     QString path = activeUrl.url(KUrl::AddTrailingSlash);
 596     const QString targetPath = url.url(KUrl::AddTrailingSlash);
 597
 598     columnIndex = lastIndex;
 599     int slashIndex = path.count('/');
 600     bool hasSubPath = (slashIndex >= 0);
 601     while (hasSubPath) {
 602         const QString subPath = targetPath.section('/', slashIndex, slashIndex);
 603         if (subPath.isEmpty()) {
 604             hasSubPath = false;
 605         } else {
 606             path += subPath + '/';
 607             ++slashIndex;
 608
 609             const KUrl childUrl = KUrl(path);
 610             const QModelIndex dirIndex = m_dolphinModel->indexForUrl(KUrl(path));
 611             const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 612
 613             m_columns[columnIndex]->setChildUrl(childUrl);
 614             columnIndex++;
 615
 616             ColumnWidget* column = new ColumnWidget(viewport(), this, childUrl);
 617             column->setModel(model());
 618             column->setRootIndex(proxyIndex);
 619             column->setActive(false);
 620
 621             m_columns.append(column);
 622
 623             // Before invoking layoutColumns() the column must be set visible temporary.
 624             // To prevent a flickering the initial geometry is set to a hidden position.
 625             column->setGeometry(QRect(-1, -1, 1, 1));
 626             column->show();
 627             layoutColumns();
 628             updateScrollBar();
 629
 630             // the layout is finished, now let the column be invisible until it
 631             // gets a valid root index due to expandToActiveUrl()
 632             column->hide();
 633         }
 634     }
 635
 636     // set the last column as active column without modifying the controller
 637     // and hence the history
 638     activeColumn()->setActive(false);
 639     m_index = columnIndex;
 640     activeColumn()->setActive(true);
 641     assureVisibleActiveColumn();
 642 }
 643
 644 void DolphinColumnView::selectAll()
 645 {
 646     activeColumn()->selectAll();
 647 }
 648
 649 bool DolphinColumnView::isIndexHidden(const QModelIndex& index) const
 650 {
 651     Q_UNUSED(index);
 652     return false;//activeColumn()->isIndexHidden(index);
 653 }
 654
 655 QModelIndex DolphinColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
 656 {
 657     // Parts of this code have been taken from QColumnView::moveCursor().
 658     // Copyright (C) 1992-2007 Trolltech ASA.
 659
 660     Q_UNUSED(modifiers);
 661     if (model() == 0) {
 662         return QModelIndex();
 663     }
 664
 665     const QModelIndex current = currentIndex();
 666     if (isRightToLeft()) {
 667         if (cursorAction == MoveLeft) {
 668             cursorAction = MoveRight;
 669         } else if (cursorAction == MoveRight) {
 670             cursorAction = MoveLeft;
 671         }
 672     }
 673
 674     switch (cursorAction) {
 675     case MoveLeft:
 676         if (m_index > 0) {
 677             setActiveColumnIndex(m_index - 1);
 678         }
 679         break;
 680
 681     case MoveRight:
 682         if (m_index < m_columns.count() - 1) {
 683             setActiveColumnIndex(m_index + 1);
 684         }
 685         break;
 686
 687     default:
 688         break;
 689     }
 690
 691     return QModelIndex();
 692 }
 693
 694 void DolphinColumnView::setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags flags)
 695 {
 696     Q_UNUSED(rect);
 697     Q_UNUSED(flags);
 698     //activeColumn()->setSelection(rect, flags);
 699 }
 700
 701 QRegion DolphinColumnView::visualRegionForSelection(const QItemSelection& selection) const
 702 {
 703     Q_UNUSED(selection);
 704     return QRegion(); //activeColumn()->visualRegionForSelection(selection);
 705 }
 706
 707 int DolphinColumnView::horizontalOffset() const
 708 {
 709     return -m_contentX;
 710 }
 711
 712 int DolphinColumnView::verticalOffset() const
 713 {
 714     return 0;
 715 }
 716
 717 void DolphinColumnView::mousePressEvent(QMouseEvent* event)
 718 {
 719     m_controller->triggerActivation();
 720     QAbstractItemView::mousePressEvent(event);
 721 }
 722
 723 void DolphinColumnView::resizeEvent(QResizeEvent* event)
 724 {
 725     QAbstractItemView::resizeEvent(event);
 726     layoutColumns();
 727     updateScrollBar();
 728 }
 729
 730 void DolphinColumnView::zoomIn()
 731 {
 732     if (isZoomInPossible()) {
 733         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 734         switch (settings->iconSize()) {
 735         case KIconLoader::SizeSmall:  settings->setIconSize(KIconLoader::SizeMedium); break;
 736         case KIconLoader::SizeMedium: settings->setIconSize(KIconLoader::SizeLarge); break;
 737         default: Q_ASSERT(false); break;
 738         }
 739         updateDecorationSize();
 740     }
 741 }
 742
 743 void DolphinColumnView::zoomOut()
 744 {
 745     if (isZoomOutPossible()) {
 746         ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 747         switch (settings->iconSize()) {
 748         case KIconLoader::SizeLarge:  settings->setIconSize(KIconLoader::SizeMedium); break;
 749         case KIconLoader::SizeMedium: settings->setIconSize(KIconLoader::SizeSmall); break;
 750         default: Q_ASSERT(false); break;
 751         }
 752         updateDecorationSize();
 753     }
 754 }
 755
 756 void DolphinColumnView::moveContentHorizontally(int x)
 757 {
 758     m_contentX = isRightToLeft() ? +x : -x;
 759     layoutColumns();
 760 }
 761
 762 void DolphinColumnView::updateDecorationSize()
 763 {
 764     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 765     const int iconSize = settings->iconSize();
 766
 767     foreach (QObject* object, viewport()->children()) {
 768         if (object->inherits("QListView")) {
 769             ColumnWidget* widget = static_cast<ColumnWidget*>(object);
 770             widget->setDecorationSize(QSize(iconSize, iconSize));
 771         }
 772     }
 773
 774     m_controller->setZoomInPossible(isZoomInPossible());
 775     m_controller->setZoomOutPossible(isZoomOutPossible());
 776
 777     doItemsLayout();
 778 }
 779
 780 void DolphinColumnView::expandToActiveUrl()
 781 {
 782     const int lastIndex = m_columns.count() - 1;
 783     Q_ASSERT(lastIndex >= 0);
 784     const KUrl& activeUrl = m_columns[lastIndex]->url();
 785     const KUrl rootUrl = m_dolphinModel->dirLister()->url();
 786     const bool expand = rootUrl.isParentOf(activeUrl)
 787                         && !rootUrl.equals(activeUrl, KUrl::CompareWithoutTrailingSlash);
 788     if (expand) {
 789         m_dolphinModel->expandToUrl(activeUrl);
 790     }
 791     updateColumns();
 792 }
 793
 794 void DolphinColumnView::triggerUpdateColumns(const QModelIndex& index)
 795 {
 796     Q_UNUSED(index);
 797     // the updating of the columns may not be done in the context of this slot
 798     QMetaObject::invokeMethod(this, "updateColumns", Qt::QueuedConnection);
 799 }
 800
 801 void DolphinColumnView::updateColumns()
 802 {
 803     const int end = m_columns.count() - 2; // next to last column
 804     for (int i = 0; i <= end; ++i) {
 805         ColumnWidget* nextColumn = m_columns[i + 1];
 806         const QModelIndex rootIndex = nextColumn->rootIndex();
 807         if (rootIndex.isValid()) {
 808             nextColumn->show();
 809         } else {
 810             const QModelIndex dirIndex = m_dolphinModel->indexForUrl(m_columns[i]->childUrl());
 811             const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 812             if (proxyIndex.isValid()) {
 813                 nextColumn->setRootIndex(proxyIndex);
 814                 nextColumn->show();
 815                 if (nextColumn->isActive() && m_restoreActiveColumnFocus) {
 816                     nextColumn->setFocus();
 817                     m_restoreActiveColumnFocus = false;
 818                 }
 819             }
 820         }
 821     }
 822 }
 823
 824 void DolphinColumnView::triggerExpandToActiveUrl()
 825 {
 826     QMetaObject::invokeMethod(this, "expandToActiveUrl", Qt::QueuedConnection);
 827 }
 828
 829 bool DolphinColumnView::isZoomInPossible() const
 830 {
 831     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 832     return settings->iconSize() < KIconLoader::SizeLarge;
 833 }
 834
 835 bool DolphinColumnView::isZoomOutPossible() const
 836 {
 837     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 838     return settings->iconSize() > KIconLoader::SizeSmall;
 839 }
 840
 841 void DolphinColumnView::setActiveColumnIndex(int index)
 842 {
 843     if (m_index == index) {
 844         return;
 845     }
 846
 847     const bool hasActiveColumn = (m_index >= 0);
 848     if (hasActiveColumn) {
 849         m_columns[m_index]->setActive(false);
 850     }
 851
 852     m_index = index;
 853     m_columns[m_index]->setActive(true);
 854
 855     m_controller->setUrl(m_columns[m_index]->url());
 856
 857     assureVisibleActiveColumn();
 858 }
 859
 860 void DolphinColumnView::layoutColumns()
 861 {
 862     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 863     const int columnWidth = settings->columnWidth();
 864     if (isRightToLeft()) {
 865         int x = viewport()->width() - columnWidth + m_contentX;
 866         foreach (ColumnWidget* column, m_columns) {
 867             column->setGeometry(QRect(x, 0, columnWidth, viewport()->height()));
 868             x -= columnWidth;
 869         }
 870     } else {
 871         int x = m_contentX;
 872         foreach (ColumnWidget* column, m_columns) {
 873             column->setGeometry(QRect(x, 0, columnWidth, viewport()->height()));
 874             x += columnWidth;
 875         }
 876     }
 877 }
 878
 879 void DolphinColumnView::updateScrollBar()
 880 {
 881     int contentWidth = 0;
 882     foreach (ColumnWidget* column, m_columns) {
 883         contentWidth += column->width();
 884     }
 885
 886     horizontalScrollBar()->setPageStep(contentWidth);
 887     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 888 }
 889
 890 void DolphinColumnView::assureVisibleActiveColumn()
 891 {
 892     const int viewportWidth = viewport()->width();
 893     const int x = activeColumn()->x();
 894     const int width = activeColumn()->width();
 895     if (x + width > viewportWidth) {
 896         const int newContentX = m_contentX - x - width + viewportWidth;
 897         if (isRightToLeft()) {
 898             m_animation->setFrameRange(m_contentX, newContentX);
 899         } else {
 900             m_animation->setFrameRange(-m_contentX, -newContentX);
 901         }
 902         m_animation->start();
 903     } else if (x < 0) {
 904         const int newContentX = m_contentX - x;
 905         if (isRightToLeft()) {
 906             m_animation->setFrameRange(m_contentX, newContentX);
 907         } else {
 908             m_animation->setFrameRange(-m_contentX, -newContentX);
 909         }
 910         m_animation->start();
 911     }
 912 }
 913
 914 void DolphinColumnView::requestActivation(ColumnWidget* column)
 915 {
 916     if (column->isActive()) {
 917         assureVisibleActiveColumn();
 918     } else {
 919         int index = 0;
 920         foreach (ColumnWidget* currColumn, m_columns) {
 921             if (currColumn == column) {
 922                 setActiveColumnIndex(index);
 923                 return;
 924             }
 925             ++index;
 926         }
 927     }
 928 }
 929
 930 #include "dolphincolumnview.moc"