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