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