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 bool DolphinColumnViewContainer::showColumn(const KUrl& url)
  87 {
  88     if (!rootUrl().isParentOf(url)) {
  89         removeAllColumns();
  90         m_columns[0]->setUrl(url);
  91         return false;
  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 false;
 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     return true;
 173 }
 174
 175 void DolphinColumnViewContainer::mousePressEvent(QMouseEvent* event)
 176 {
 177     m_controller->requestActivation();
 178     QScrollArea::mousePressEvent(event);
 179 }
 180
 181 void DolphinColumnViewContainer::resizeEvent(QResizeEvent* event)
 182 {
 183     QScrollArea::resizeEvent(event);
 184     layoutColumns();
 185     updateScrollBar();
 186     assureVisibleActiveColumn();
 187 }
 188
 189 void DolphinColumnViewContainer::wheelEvent(QWheelEvent* event)
 190 {
 191     // let Ctrl+wheel events propagate to the DolphinView for icon zooming
 192     if ((event->modifiers() & Qt::ControlModifier) == Qt::ControlModifier) {
 193         event->ignore();
 194     } else {
 195         QScrollArea::wheelEvent(event);
 196     }
 197 }
 198
 199 void DolphinColumnViewContainer::moveContentHorizontally(int x)
 200 {
 201     m_contentX = isRightToLeft() ? +x : -x;
 202     layoutColumns();
 203 }
 204
 205 void DolphinColumnViewContainer::updateColumnsBackground(bool active)
 206 {
 207     if (active == m_active) {
 208         return;
 209     }
 210
 211     m_active = active;
 212
 213     // dim the background of the viewport
 214     const QPalette::ColorRole role = viewport()->backgroundRole();
 215     QColor background = viewport()->palette().color(role);
 216     background.setAlpha(0);  // make background transparent
 217
 218     QPalette palette = viewport()->palette();
 219     palette.setColor(role, background);
 220     viewport()->setPalette(palette);
 221
 222     foreach (DolphinColumnView* column, m_columns) {
 223         column->updateBackground();
 224     }
 225 }
 226
 227 void DolphinColumnViewContainer::setActiveColumnIndex(int index)
 228 {
 229     if (m_index == index) {
 230         return;
 231     }
 232
 233     const bool hasActiveColumn = (m_index >= 0);
 234     if (hasActiveColumn) {
 235         m_columns[m_index]->setActive(false);
 236     }
 237
 238     m_index = index;
 239     m_columns[m_index]->setActive(true);
 240
 241     assureVisibleActiveColumn();
 242 }
 243
 244 void DolphinColumnViewContainer::layoutColumns()
 245 {
 246     const int gap = 4;
 247
 248     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 249     const int columnWidth = settings->columnWidth();
 250
 251     QRect emptyViewportRect;
 252     if (isRightToLeft()) {
 253         int x = viewport()->width() - columnWidth + m_contentX;
 254         foreach (DolphinColumnView* column, m_columns) {
 255             column->setGeometry(QRect(x, 0, columnWidth - gap, viewport()->height()));
 256             x -= columnWidth;
 257         }
 258         emptyViewportRect = QRect(0, 0, x + columnWidth - gap, viewport()->height());
 259     } else {
 260         int x = 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(x, 0, viewport()->width() - x - gap, viewport()->height());
 266     }
 267
 268     if (emptyViewportRect.isValid()) {
 269         m_emptyViewport->show();
 270         m_emptyViewport->setGeometry(emptyViewportRect);
 271     } else {
 272         m_emptyViewport->hide();
 273     }
 274 }
 275
 276 void DolphinColumnViewContainer::updateScrollBar()
 277 {
 278     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 279     const int contentWidth = m_columns.count() * settings->columnWidth();
 280
 281     horizontalScrollBar()->setPageStep(contentWidth);
 282     horizontalScrollBar()->setRange(0, contentWidth - viewport()->width());
 283 }
 284
 285 void DolphinColumnViewContainer::assureVisibleActiveColumn()
 286 {
 287     const int viewportWidth = viewport()->width();
 288     const int x = activeColumn()->x();
 289
 290     ColumnModeSettings* settings = DolphinSettings::instance().columnModeSettings();
 291     const int width = settings->columnWidth();
 292
 293     if (x + width > viewportWidth) {
 294         const int newContentX = m_contentX - x - width + viewportWidth;
 295         if (isRightToLeft()) {
 296             m_animation->setFrameRange(m_contentX, newContentX);
 297         } else {
 298             m_animation->setFrameRange(-m_contentX, -newContentX);
 299         }
 300         if (m_animation->state() != QTimeLine::Running) {
 301            m_animation->start();
 302         }
 303     } else if (x < 0) {
 304         const int newContentX = m_contentX - x;
 305         if (isRightToLeft()) {
 306             m_animation->setFrameRange(m_contentX, newContentX);
 307         } else {
 308             m_animation->setFrameRange(-m_contentX, -newContentX);
 309         }
 310         if (m_animation->state() != QTimeLine::Running) {
 311            m_animation->start();
 312         }
 313     }
 314 }
 315
 316 void DolphinColumnViewContainer::requestActivation(DolphinColumnView* column)
 317 {
 318     m_controller->setItemView(column);
 319     if (column->isActive()) {
 320         assureVisibleActiveColumn();
 321     } else {
 322         int index = 0;
 323         foreach (DolphinColumnView* currColumn, m_columns) {
 324             if (currColumn == column) {
 325                 setActiveColumnIndex(index);
 326                 return;
 327             }
 328             ++index;
 329         }
 330     }
 331 }
 332
 333 void DolphinColumnViewContainer::removeAllColumns()
 334 {
 335     QList<DolphinColumnView*>::iterator start = m_columns.begin() + 1;
 336     QList<DolphinColumnView*>::iterator end = m_columns.end();
 337     for (QList<DolphinColumnView*>::iterator it = start; it != end; ++it) {
 338         deleteColumn(*it);
 339     }
 340     m_columns.erase(start, end);
 341     m_index = 0;
 342     m_columns[0]->setActive(true);
 343     assureVisibleActiveColumn();
 344 }
 345
 346 QPoint DolphinColumnViewContainer::columnPosition(DolphinColumnView* column, const QPoint& point) const
 347 {
 348     const QPoint topLeft = column->frameGeometry().topLeft();
 349     return QPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
 350 }
 351
 352 void DolphinColumnViewContainer::deleteColumn(DolphinColumnView* column)
 353 {
 354     if (column != 0) {
 355         if (m_controller->itemView() == column) {
 356             m_controller->setItemView(0);
 357         }
 358         // deleteWhenNotDragSource(column) does not necessarily delete column,
 359         // and we want its preview generator destroyed immediately.
 360         column->hide();
 361         // Prevent automatic destruction of column when this DolphinColumnViewContainer
 362         // is destroyed.
 363         column->setParent(0);
 364         column->disconnect();
 365         emit requestColumnDeletion(column);
 366     }
 367 }
 368
 369 #include "dolphincolumnviewcontainer.moc"