src/dolphiniconsview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 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 "dolphiniconsview.h"
  21
  22 #include "dolphincategorydrawer.h"
  23 #include "dolphincontroller.h"
  24 #include "dolphinsettings.h"
  25 #include "dolphin_iconsmodesettings.h"
  26 #include "dolphin_generalsettings.h"
  27 #include "draganddrophelper.h"
  28 #include "selectionmanager.h"
  29
  30 #include <kcategorizedsortfilterproxymodel.h>
  31 #include <kdialog.h>
  32 #include <kdirmodel.h>
  33 #include <kfileitemdelegate.h>
  34
  35 #include <QAbstractProxyModel>
  36 #include <QApplication>
  37 #include <QPainter>
  38 #include <QPoint>
  39 #include <QScrollBar>
  40
  41 DolphinIconsView::DolphinIconsView(QWidget* parent, DolphinController* controller) :
  42     KCategorizedView(parent),
  43     m_enableScrollTo(false),
  44     m_controller(controller),
  45     m_selectionManager(0),
  46     m_categoryDrawer(0),
  47     m_font(),
  48     m_decorationSize(),
  49     m_decorationPosition(QStyleOptionViewItem::Top),
  50     m_displayAlignment(Qt::AlignHCenter),
  51     m_itemSize(),
  52     m_dropRect()
  53 {
  54     Q_ASSERT(controller != 0);
  55     setViewMode(QListView::IconMode);
  56     setResizeMode(QListView::Adjust);
  57     setSpacing(KDialog::spacingHint());
  58     setMovement(QListView::Static);
  59     setDragEnabled(true);
  60     setEditTriggers(QAbstractItemView::NoEditTriggers);
  61     viewport()->setAcceptDrops(true);
  62
  63     setMouseTracking(true);
  64
  65     // TODO: Connecting to the signal 'activated()' is not possible, as kstyle
  66     // does not forward the single vs. doubleclick to it yet (KDE 4.1?). Hence it is
  67     // necessary connecting the signal 'singleClick()' or 'doubleClick' and to handle the
  68     // RETURN-key in keyPressEvent().
  69     if (KGlobalSettings::singleClick()) {
  70         connect(this, SIGNAL(clicked(const QModelIndex&)),
  71                 controller, SLOT(triggerItem(const QModelIndex&)));
  72         if (DolphinSettings::instance().generalSettings()->showSelectionToggle()) {
  73             m_selectionManager = new SelectionManager(this);
  74             connect(m_selectionManager, SIGNAL(selectionChanged()),
  75                     this, SLOT(requestActivation()));
  76             connect(m_controller, SIGNAL(urlChanged(const KUrl&)),
  77                     m_selectionManager, SLOT(reset()));
  78         }
  79     } else {
  80         connect(this, SIGNAL(doubleClicked(const QModelIndex&)),
  81                 controller, SLOT(triggerItem(const QModelIndex&)));
  82     }
  83     connect(this, SIGNAL(entered(const QModelIndex&)),
  84             controller, SLOT(emitItemEntered(const QModelIndex&)));
  85     connect(this, SIGNAL(viewportEntered()),
  86             controller, SLOT(emitViewportEntered()));
  87     connect(controller, SIGNAL(zoomIn()),
  88             this, SLOT(zoomIn()));
  89     connect(controller, SIGNAL(zoomOut()),
  90             this, SLOT(zoomOut()));
  91
  92     const DolphinView* view = controller->dolphinView();
  93     connect(view, SIGNAL(showPreviewChanged()),
  94             this, SLOT(slotShowPreviewChanged()));
  95     connect(view, SIGNAL(additionalInfoChanged()),
  96             this, SLOT(slotAdditionalInfoChanged()));
  97
  98     // apply the icons mode settings to the widget
  99     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 100     Q_ASSERT(settings != 0);
 101
 102     if (settings->useSystemFont()) {
 103         m_font = KGlobalSettings::generalFont();
 104     } else {
 105         m_font = QFont(settings->fontFamily(),
 106                        settings->fontSize(),
 107                        settings->fontWeight(),
 108                        settings->italicFont());
 109     }
 110
 111     setWordWrap(settings->numberOfTextlines() > 1);
 112     updateGridSize(view->showPreview(), 0);
 113
 114     if (settings->arrangement() == QListView::TopToBottom) {
 115         setFlow(QListView::LeftToRight);
 116         m_decorationPosition = QStyleOptionViewItem::Top;
 117         m_displayAlignment = Qt::AlignHCenter;
 118     } else {
 119         setFlow(QListView::TopToBottom);
 120         m_decorationPosition = QStyleOptionViewItem::Left;
 121         m_displayAlignment = Qt::AlignLeft | Qt::AlignVCenter;
 122     }
 123
 124     m_categoryDrawer = new DolphinCategoryDrawer();
 125     setCategoryDrawer(m_categoryDrawer);
 126
 127     setFocus();
 128
 129     connect(KGlobalSettings::self(), SIGNAL(kdisplayFontChanged()),
 130             this, SLOT(updateFont()));
 131 }
 132
 133 DolphinIconsView::~DolphinIconsView()
 134 {
 135     delete m_categoryDrawer;
 136     m_categoryDrawer = 0;
 137 }
 138
 139 void DolphinIconsView::scrollTo(const QModelIndex& index, ScrollHint hint)
 140 {
 141     // Enable the QListView implementation of scrollTo() only if it has been
 142     // triggered by a key press. Otherwise QAbstractItemView wants to scroll to the current
 143     // index each time the layout has been changed. This becomes an issue when
 144     // previews are loaded and the scrollbar is used: the scrollbar will always
 145     // be reset to 0 on each new preview.
 146     if (m_enableScrollTo || (state() != QAbstractItemView::NoState)) {
 147         KCategorizedView::scrollTo(index, hint);
 148         m_enableScrollTo = false;
 149     }
 150 }
 151
 152 void DolphinIconsView::dataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight)
 153 {
 154     KCategorizedView::dataChanged(topLeft, bottomRight);
 155
 156     KCategorizedSortFilterProxyModel* proxyModel = dynamic_cast<KCategorizedSortFilterProxyModel*>(model());
 157     if ((flow() == QListView::LeftToRight) && !proxyModel->isCategorizedModel()) {
 158         // bypass a QListView issue that items are not layout correctly if the decoration size of
 159         // an index changes
 160         scheduleDelayedItemsLayout();
 161     }
 162 }
 163
 164 QStyleOptionViewItem DolphinIconsView::viewOptions() const
 165 {
 166     QStyleOptionViewItem viewOptions = KCategorizedView::viewOptions();
 167     viewOptions.font = m_font;
 168     viewOptions.decorationPosition = m_decorationPosition;
 169     viewOptions.decorationSize = m_decorationSize;
 170     viewOptions.displayAlignment = m_displayAlignment;
 171     viewOptions.showDecorationSelected = true;
 172     return viewOptions;
 173 }
 174
 175 void DolphinIconsView::contextMenuEvent(QContextMenuEvent* event)
 176 {
 177     KCategorizedView::contextMenuEvent(event);
 178     m_controller->triggerContextMenuRequest(event->pos());
 179 }
 180
 181 void DolphinIconsView::mousePressEvent(QMouseEvent* event)
 182 {
 183     m_controller->requestActivation();
 184     const QModelIndex index = indexAt(event->pos());
 185     if (index.isValid() && (event->button() == Qt::LeftButton)) {
 186         // TODO: It should not be necessary to manually set the dragging state, but I could
 187         // not reproduce this issue with a Qt-only example yet to find the root cause.
 188         // Issue description: start Dolphin, split the view and drag an item from the
 189         // inactive view to the active view by a very fast mouse movement. Result:
 190         // the item gets selected instead of being dragged...
 191         setState(QAbstractItemView::DraggingState);
 192     }
 193
 194     if (!index.isValid()) {
 195         const Qt::KeyboardModifiers modifier = QApplication::keyboardModifiers();
 196         if (!(modifier & Qt::ShiftModifier) && !(modifier & Qt::ControlModifier)) {
 197             clearSelection();
 198         }
 199     }
 200
 201     KCategorizedView::mousePressEvent(event);
 202 }
 203
 204 void DolphinIconsView::startDrag(Qt::DropActions supportedActions)
 205 {
 206     // TODO: invoking KCategorizedView::startDrag() should not be necessary, we'll
 207     // fix this in KDE 4.1
 208     KCategorizedView::startDrag(supportedActions);
 209     DragAndDropHelper::startDrag(this, supportedActions);
 210 }
 211
 212 void DolphinIconsView::dragEnterEvent(QDragEnterEvent* event)
 213 {
 214     if (event->mimeData()->hasUrls()) {
 215         event->acceptProposedAction();
 216     }
 217 }
 218
 219 void DolphinIconsView::dragLeaveEvent(QDragLeaveEvent* event)
 220 {
 221     KCategorizedView::dragLeaveEvent(event);
 222     setDirtyRegion(m_dropRect);
 223 }
 224
 225 void DolphinIconsView::dragMoveEvent(QDragMoveEvent* event)
 226 {
 227     KCategorizedView::dragMoveEvent(event);
 228
 229     // TODO: remove this code when the issue #160611 is solved in Qt 4.4
 230     const QModelIndex index = indexAt(event->pos());
 231     setDirtyRegion(m_dropRect);
 232
 233     m_dropRect.setSize(QSize()); // set as invalid
 234     if (index.isValid()) {
 235         const KFileItem item = m_controller->itemForIndex(index);
 236         if (!item.isNull() && item.isDir()) {
 237             m_dropRect = visualRect(index);
 238         } else {
 239             m_dropRect.setSize(QSize()); // set as invalid
 240         }
 241     }
 242     if (event->mimeData()->hasUrls()) {
 243         // accept url drops, independently from the destination item
 244         event->acceptProposedAction();
 245     }
 246
 247     setDirtyRegion(m_dropRect);
 248 }
 249
 250 void DolphinIconsView::dropEvent(QDropEvent* event)
 251 {
 252     if (!selectionModel()->isSelected(indexAt(event->pos()))) {
 253         const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 254         if (!urls.isEmpty()) {
 255             const QModelIndex index = indexAt(event->pos());
 256             const KFileItem item = m_controller->itemForIndex(index);
 257             m_controller->indicateDroppedUrls(urls,
 258                                               m_controller->url(),
 259                                               item);
 260             event->acceptProposedAction();
 261         }
 262     }
 263
 264     KCategorizedView::dropEvent(event);
 265 }
 266
 267 void DolphinIconsView::keyPressEvent(QKeyEvent* event)
 268 {
 269     KCategorizedView::keyPressEvent(event);
 270     m_controller->handleKeyPressEvent(event);
 271     m_enableScrollTo = true; // see DolphinIconsView::scrollTo()
 272 }
 273
 274 void DolphinIconsView::wheelEvent(QWheelEvent* event)
 275 {
 276     if (m_selectionManager != 0) {
 277         m_selectionManager->reset();
 278     }
 279
 280     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 281     if (event->modifiers() & Qt::ControlModifier) {
 282         event->ignore();
 283         return;
 284     }
 285     KCategorizedView::wheelEvent(event);
 286     // if the icons are aligned left to right, the vertical wheel event should
 287     // be applied to the horizontal scrollbar
 288     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 289     const bool scrollHorizontal = (event->orientation() == Qt::Vertical) &&
 290                                   (settings->arrangement() == QListView::LeftToRight);
 291     if (scrollHorizontal) {
 292         QWheelEvent horizEvent(event->pos(),
 293                                event->delta(),
 294                                event->buttons(),
 295                                event->modifiers(),
 296                                Qt::Horizontal);
 297         QApplication::sendEvent(horizontalScrollBar(), &horizEvent);
 298     }
 299 }
 300
 301 void DolphinIconsView::showEvent(QShowEvent* event)
 302 {
 303     KFileItemDelegate* delegate = dynamic_cast<KFileItemDelegate*>(itemDelegate());
 304     delegate->setMaximumSize(m_itemSize);
 305
 306     KCategorizedView::showEvent(event);
 307 }
 308
 309 void DolphinIconsView::leaveEvent(QEvent* event)
 310 {
 311     KCategorizedView::leaveEvent(event);
 312     // if the mouse is above an item and moved very fast outside the widget,
 313     // no viewportEntered() signal might be emitted although the mouse has been moved
 314     // above the viewport
 315     m_controller->emitViewportEntered();
 316 }
 317
 318 void DolphinIconsView::slotShowPreviewChanged()
 319 {
 320     const DolphinView* view = m_controller->dolphinView();
 321     updateGridSize(view->showPreview(), additionalInfoCount());
 322 }
 323
 324 void DolphinIconsView::slotAdditionalInfoChanged()
 325 {
 326     const DolphinView* view = m_controller->dolphinView();
 327     const bool showPreview = view->showPreview();
 328     updateGridSize(showPreview, view->additionalInfo().count());
 329 }
 330
 331 void DolphinIconsView::zoomIn()
 332 {
 333     if (isZoomInPossible()) {
 334         IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 335
 336         const int oldIconSize = settings->iconSize();
 337         int newIconSize = oldIconSize;
 338
 339         const bool showPreview = m_controller->dolphinView()->showPreview();
 340         if (showPreview) {
 341             const int previewSize = increasedIconSize(settings->previewSize());
 342             settings->setPreviewSize(previewSize);
 343         } else {
 344             newIconSize = increasedIconSize(oldIconSize);
 345             settings->setIconSize(newIconSize);
 346         }
 347
 348         // increase also the grid size
 349         const int diff = newIconSize - oldIconSize;
 350         settings->setItemWidth(settings->itemWidth() + diff);
 351         settings->setItemHeight(settings->itemHeight() + diff);
 352
 353         updateGridSize(showPreview, additionalInfoCount());
 354     }
 355 }
 356
 357 void DolphinIconsView::zoomOut()
 358 {
 359     if (isZoomOutPossible()) {
 360         IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 361
 362         const int oldIconSize = settings->iconSize();
 363         int newIconSize = oldIconSize;
 364
 365         const bool showPreview = m_controller->dolphinView()->showPreview();
 366         if (showPreview) {
 367             const int previewSize = decreasedIconSize(settings->previewSize());
 368             settings->setPreviewSize(previewSize);
 369         } else {
 370             newIconSize = decreasedIconSize(settings->iconSize());
 371             settings->setIconSize(newIconSize);
 372         }
 373
 374         // decrease also the grid size
 375         const int diff = oldIconSize - newIconSize;
 376         settings->setItemWidth(settings->itemWidth() - diff);
 377         settings->setItemHeight(settings->itemHeight() - diff);
 378
 379         updateGridSize(showPreview, additionalInfoCount());
 380     }
 381 }
 382
 383 void DolphinIconsView::requestActivation()
 384 {
 385     m_controller->requestActivation();
 386 }
 387
 388 void DolphinIconsView::updateFont()
 389 {
 390     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 391     Q_ASSERT(settings != 0);
 392
 393     if (settings->useSystemFont()) {
 394         m_font = KGlobalSettings::generalFont();
 395     }
 396 }
 397
 398 bool DolphinIconsView::isZoomInPossible() const
 399 {
 400     IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 401     const bool showPreview = m_controller->dolphinView()->showPreview();
 402     const int size = showPreview ? settings->previewSize() : settings->iconSize();
 403     return size < KIconLoader::SizeEnormous;
 404 }
 405
 406 bool DolphinIconsView::isZoomOutPossible() const
 407 {
 408     IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 409     const bool showPreview = m_controller->dolphinView()->showPreview();
 410     const int size = showPreview ? settings->previewSize() : settings->iconSize();
 411     return size > KIconLoader::SizeSmall;
 412 }
 413
 414 int DolphinIconsView::increasedIconSize(int size) const
 415 {
 416     int incSize = 0;
 417     switch (size) {
 418     case KIconLoader::SizeSmall:       incSize = KIconLoader::SizeSmallMedium; break;
 419     case KIconLoader::SizeSmallMedium: incSize = KIconLoader::SizeMedium; break;
 420     case KIconLoader::SizeMedium:      incSize = KIconLoader::SizeLarge; break;
 421     case KIconLoader::SizeLarge:       incSize = KIconLoader::SizeHuge; break;
 422     case KIconLoader::SizeHuge:        incSize = KIconLoader::SizeEnormous; break;
 423     default: Q_ASSERT(false); break;
 424     }
 425     return incSize;
 426 }
 427
 428 int DolphinIconsView::decreasedIconSize(int size) const
 429 {
 430     int decSize = 0;
 431     switch (size) {
 432     case KIconLoader::SizeSmallMedium: decSize = KIconLoader::SizeSmall; break;
 433     case KIconLoader::SizeMedium: decSize = KIconLoader::SizeSmallMedium; break;
 434     case KIconLoader::SizeLarge: decSize = KIconLoader::SizeMedium; break;
 435     case KIconLoader::SizeHuge: decSize = KIconLoader::SizeLarge; break;
 436     case KIconLoader::SizeEnormous: decSize = KIconLoader::SizeHuge; break;
 437     default: Q_ASSERT(false); break;
 438     }
 439     return decSize;
 440 }
 441
 442 void DolphinIconsView::updateGridSize(bool showPreview, int additionalInfoCount)
 443 {
 444     const IconsModeSettings* settings = DolphinSettings::instance().iconsModeSettings();
 445     Q_ASSERT(settings != 0);
 446
 447     int itemWidth = settings->itemWidth();
 448     int itemHeight = settings->itemHeight();
 449     int size = settings->iconSize();
 450
 451     if (showPreview) {
 452         const int previewSize = settings->previewSize();
 453         const int diff = previewSize - size;
 454         itemWidth  += diff;
 455         itemHeight += diff;
 456
 457         size = previewSize;
 458     }
 459
 460     Q_ASSERT(additionalInfoCount >= 0);
 461     itemHeight += additionalInfoCount * m_font.pointSize() * 2;
 462
 463     if (settings->arrangement() == QListView::TopToBottom) {
 464         // The decoration width indirectly defines the maximum
 465         // width for the text wrapping. To use the maximum item width
 466         // for text wrapping, it is used as decoration width.
 467         m_decorationSize = QSize(itemWidth, size);
 468         setIconSize(QSize(itemWidth, size));
 469     } else {
 470         m_decorationSize = QSize(size, size);
 471         setIconSize(QSize(size, size));
 472     }
 473
 474     m_itemSize = QSize(itemWidth, itemHeight);
 475
 476     const int spacing = settings->gridSpacing();
 477     setGridSize(QSize(itemWidth + spacing * 2, itemHeight + spacing));
 478
 479     m_controller->setZoomInPossible(isZoomInPossible());
 480     m_controller->setZoomOutPossible(isZoomOutPossible());
 481
 482     KFileItemDelegate* delegate = dynamic_cast<KFileItemDelegate*>(itemDelegate());
 483     if (delegate != 0) {
 484         delegate->setMaximumSize(m_itemSize);
 485     }
 486
 487     if (m_selectionManager != 0) {
 488         m_selectionManager->reset();
 489     }
 490 }
 491
 492 int DolphinIconsView::additionalInfoCount() const
 493 {
 494     const DolphinView* view = m_controller->dolphinView();
 495     return view->additionalInfo().count();
 496 }
 497
 498 #include "dolphiniconsview.moc"