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