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