src/views/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     requestActivation(column);
  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     requestActivation(m_columns[columnIndex]);
 179 }
 180
 181 void DolphinColumnViewContainer::mousePressEvent(QMouseEvent* event)
 182 {
 183     m_dolphinViewController->requestActivation();
 184     QScrollArea::mousePressEvent(event);
 185 }
 186
 187 void DolphinColumnViewContainer::keyPressEvent(QKeyEvent* event)
 188 {
 189     if (event->key() == Qt::Key_Left) {
 190         if (m_index > 0) {
 191             requestActivation(m_columns[m_index - 1]);
 192         }
 193     } else {
 194         QScrollArea::keyPressEvent(event);
 195     }
 196 }
 197
 198 void DolphinColumnViewContainer::resizeEvent(QResizeEvent* event)
 199 {
 200     QScrollArea::resizeEvent(event);
 201     layoutColumns();
 202     updateScrollBar();
 203     assureVisibleActiveColumn();
 204 }
 205
 206 void DolphinColumnViewContainer::wheelEvent(QWheelEvent* event)
 207 {
 208     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 209     if ((event->modifiers() & Qt::ControlModifier) == Qt::ControlModifier) {
 210         event->ignore();
 211     } else {
 212         QScrollArea::wheelEvent(event);
 213     }
 214 }
 215
 216 void DolphinColumnViewContainer::moveContentHorizontally(int x)
 217 {
 218     m_contentX = isRightToLeft() ? +x : -x;
 219     layoutColumns();
 220 }
 221
 222 void DolphinColumnViewContainer::updateColumnsBackground(bool active)
 223 {
 224     if (active == m_active) {
 225         return;
 226     }
 227
 228     m_active = active;
 229
 230     // dim the background of the viewport
 231     const QPalette::ColorRole role = viewport()->backgroundRole();
 232     QColor background = viewport()->palette().color(role);
 233     background.setAlpha(0);  // make background transparent
 234
 235     QPalette palette = viewport()->palette();
 236     palette.setColor(role, background);
 237     viewport()->setPalette(palette);
 238
 239     foreach (DolphinColumnView* column, m_columns) {
 240         column->updateBackground();
 241     }
 242 }
 243
 244 void DolphinColumnViewContainer::updateActiveUrl()
 245 {
 246     const KUrl activeUrl = m_columns[m_index]->url();
 247     m_dolphinViewController->requestUrlChange(activeUrl);
 248 }
 249
 250 void DolphinColumnViewContainer::layoutColumns()
 251 {
 252     const int gap = 4;
 253
 254     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 255     const int columnWidth = settings->columnWidth();
 256
 257     QRect emptyViewportRect;
 258     if (isRightToLeft()) {
 259         int x = viewport()->width() - columnWidth + m_contentX;
 260         foreach (DolphinColumnView* column, m_columns) {
 261             column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
 262             x -= columnWidth;
 263         }
 264         emptyViewportRect = QRect(0, 0, x + columnWidth - gap, viewport()->height());
 265     } else {
 266         int x = m_contentX;
 267         foreach (DolphinColumnView* column, m_columns) {
 268             column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
 269             x += columnWidth;
 270         }
 271         emptyViewportRect = QRect(x, 0, viewport()->width() - x - gap, viewport()->height());
 272     }
 273
 274     if (emptyViewportRect.isValid()) {
 275         m_emptyViewport->show();
 276         m_emptyViewport->setGeometry(emptyViewportRect);
 277     } else {
 278         m_emptyViewport->hide();
 279     }
 280 }
 281
 282 void DolphinColumnViewContainer::updateScrollBar()
 283 {
 284     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 285     const int contentWidth = m_columns.count() * settings->columnWidth();
 286
 287     horizontalScrollBar()->setPageStep(contentWidth);
 288     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 289 }
 290
 291 void DolphinColumnViewContainer::assureVisibleActiveColumn()
 292 {
 293     const int viewportWidth = viewport()->width();
 294     const int x = activeColumn()->x();
 295
 296     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 297     const int width = settings->columnWidth();
 298
 299     if (x + width > viewportWidth) {
 300         const int newContentX = m_contentX - x - width + viewportWidth;
 301         if (isRightToLeft()) {
 302             m_animation->setFrameRange(m_contentX, newContentX);
 303         } else {
 304             m_animation->setFrameRange(-m_contentX, -newContentX);
 305         }
 306         if (m_animation->state() != QTimeLine::Running) {
 307            m_animation->start();
 308         }
 309     } else if (x < 0) {
 310         const int newContentX = m_contentX - x;
 311         if (isRightToLeft()) {
 312             m_animation->setFrameRange(m_contentX, newContentX);
 313         } else {
 314             m_animation->setFrameRange(-m_contentX, -newContentX);
 315         }
 316         if (m_animation->state() != QTimeLine::Running) {
 317            m_animation->start();
 318         }
 319     }
 320 }
 321
 322 void DolphinColumnViewContainer::requestActivation(DolphinColumnView* column)
 323 {
 324     if (m_dolphinViewController->itemView() != column) {
 325         m_dolphinViewController->setItemView(column);
 326     }
 327     if (focusProxy() != column) {
 328         setFocusProxy(column);
 329     }
 330
 331     if (column->isActive()) {
 332         assureVisibleActiveColumn();
 333     } else {
 334         // Deactivate the currently active column
 335         if (m_index >= 0) {
 336             m_columns[m_index]->setActive(false);
 337         }
 338
 339         // Get the index of the column that should get activated
 340         int index = 0;
 341         foreach (DolphinColumnView* currColumn, m_columns) {
 342             if (currColumn == column) {
 343                 break;
 344             }
 345             ++index;
 346         }
 347
 348         Q_ASSERT(index != m_index);
 349         Q_ASSERT(index < m_columns.count());
 350
 351         // Activate the requested column
 352         m_index = index;
 353         m_columns[m_index]->setActive(true);
 354
 355         assureVisibleActiveColumn();
 356         m_activeUrlTimer->start(); // calls slot updateActiveUrl()
 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"