apps/dolphin/src/dolphincontroller.h

   1 /***************************************************************************
   2  *   Copyright (C) 2006 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 #ifndef DOLPHINCONTROLLER_H
  21 #define DOLPHINCONTROLLER_H
  22
  23 #include <dolphinview.h>
  24 #include <kurl.h>
  25 #include <QtCore/QObject>
  26 #include <libdolphin_export.h>
  27
  28 class QAbstractItemView;
  29 class DolphinView;
  30 class KUrl;
  31 class QBrush;
  32 class QPoint;
  33 class QRect;
  34 class QWidget;
  35
  36 // TODO: get rid of all the state duplications in the controller and allow read access
  37 // to the Dolphin view for all view implementations
  38
  39 /**
  40  * @brief Acts as mediator between the abstract Dolphin view and the view
  41  *        implementations.
  42  *
  43  * The abstract Dolphin view (see DolphinView) represents the parent of the controller.
  44  * The lifetime of the controller is equal to the lifetime of the Dolphin view.
  45  * The controller is passed to the current view implementation
  46  * (see DolphinIconsView, DolphinDetailsView and DolphinColumnView)
  47  * by passing it in the constructor and informing the controller about the change
  48  * of the view implementation:
  49  *
  50  * \code
  51  * QAbstractItemView* view = new DolphinIconsView(parent, controller);
  52  * controller->setItemView(view);
  53  * \endcode
  54  *
  55  * The communication of the view implementations to the abstract view is done by:
  56  * - triggerContextMenuRequest()
  57  * - requestActivation()
  58  * - triggerUrlChangeRequest()
  59  * - indicateDroppedUrls()
  60  * - indicateSortingChange()
  61  * - indicateSortOrderChanged()
  62  * - triggerItem()
  63  * - requestTab()
  64  * - handleKeyPressEvent()
  65  * - emitItemEntered()
  66  * - emitViewportEntered()
  67  * - replaceUrlByClipboard()
  68  * - hideToolTip()
  69  *
  70  * The communication of the abstract view to the view implementations is done by:
  71  * - setUrl()
  72  * - setShowHiddenFiles()
  73  * - setShowPreview()
  74  * - indicateActivationChange()
  75  * - setZoomLevel()
  76  */
  77 class LIBDOLPHINPRIVATE_EXPORT DolphinController : public QObject
  78 {
  79     Q_OBJECT
  80
  81 public:
  82     explicit DolphinController(DolphinView* dolphinView);
  83     virtual ~DolphinController();
  84
  85     /**
  86      * Allows read access for the view implementation to the abstract
  87      * Dolphin view.
  88      */
  89     const DolphinView* dolphinView() const;
  90
  91     /**
  92      * Sets the URL to \a url and emits the signal urlChanged() if
  93      * \a url is different for the current URL. This method should
  94      * be invoked by the abstract Dolphin view whenever the current
  95      * URL has been changed.
  96      */
  97     void setUrl(const KUrl& url);
  98     const KUrl& url() const;
  99
 100     /**
 101      * Changes the current item view where the controller is working. This
 102      * is only necessary for views like the tree view, where internally
 103      * several QAbstractItemView instances are used.
 104      */
 105     void setItemView(QAbstractItemView* view);
 106
 107     QAbstractItemView* itemView() const;
 108
 109     /**
 110      * Allows a view implementation to request an URL change to \a url.
 111      * The signal requestUrlChange() is emitted and the abstract Dolphin view
 112      * will assure that the URL of the Dolphin Controller will be updated
 113      * later. Invoking this method makes only sense if the view implementation
 114      * shows a hierarchy of URLs and allows to change the URL within
 115      * the view (e. g. this is the case in the column view).
 116      */
 117     void triggerUrlChangeRequest(const KUrl& url);
 118
 119     /**
 120      * Requests a context menu for the position \a pos. This method
 121      * should be invoked by the view implementation when a context
 122      * menu should be opened. The abstract Dolphin view itself
 123      * takes care itself to get the selected items depending from
 124      * \a pos.
 125      */
 126     void triggerContextMenuRequest(const QPoint& pos);
 127
 128     /**
 129      * Requests an activation of the view and emits the signal
 130      * activated(). This method should be invoked by the view implementation
 131      * if e. g. a mouse click on the view has been done.
 132      * After the activation has been changed, the view implementation
 133      * might listen to the activationChanged() signal.
 134      */
 135     void requestActivation();
 136
 137     /**
 138      * Indicates that URLs are dropped above a destination. This method
 139      * should be invoked by the view implementation. The abstract Dolphin view
 140      * will start the corresponding action (copy, move, link).
 141      * @param destItem  Item of the destination (can be null, see KFileItem::isNull()).
 142      * @param destPath  Path of the destination.
 143      * @param event     Drop event
 144      */
 145     void indicateDroppedUrls(const KFileItem& destItem,
 146                              const KUrl& destPath,
 147                              QDropEvent* event);
 148
 149     /**
 150      * Informs the abstract Dolphin view about a sorting change done inside
 151      * the view implementation. This method should be invoked by the view
 152      * implementation (e. g. the details view uses this method in combination
 153      * with the details header).
 154      */
 155     void indicateSortingChange(DolphinView::Sorting sorting);
 156
 157     /**
 158      * Informs the abstract Dolphin view about a sort order change done inside
 159      * the view implementation. This method should be invoked by the view
 160      * implementation (e. g. the details view uses this method in combination
 161      * with the details header).
 162      */
 163     void indicateSortOrderChange(Qt::SortOrder order);
 164
 165     /**
 166      * Informs the abstract Dolphin view about an additional information change
 167      * done inside the view implementation. This method should be invoked by the
 168      * view implementation (e. g. the details view uses this method in combination
 169      * with the details header).
 170      */
 171     void indicateAdditionalInfoChange(const KFileItemDelegate::InformationList& info);
 172
 173     /**
 174      * Informs the view implementation about a change of the activation
 175      * state and is invoked by the abstract Dolphin view. The signal
 176      * activationChanged() is emitted.
 177      */
 178     void indicateActivationChange(bool active);
 179
 180     /**
 181      * Sets the zoom level to \a level and emits the signal zoomLevelChanged().
 182      * It must be assured that the used level is inside the range
 183      * DolphinController::zoomLevelMinimum() and
 184      * DolphinController::zoomLevelMaximum().
 185      * Is invoked by the abstract Dolphin view.
 186      */
 187     void setZoomLevel(int level);
 188     int zoomLevel() const;
 189
 190     /**
 191      * Tells the view implementation to zoom out by emitting the signal zoomOut()
 192      * and is invoked by the abstract Dolphin view.
 193      */
 194     void triggerZoomOut();
 195
 196     /**
 197      * Should be invoked in each view implementation whenever a key has been
 198      * pressed. If the selection model of \a view is not empty and
 199      * the return key has been pressed, the selected items will get triggered.
 200      */
 201     void handleKeyPressEvent(QKeyEvent* event);
 202
 203     /**
 204      * Replaces the URL of the abstract Dolphin view  with the content
 205      * of the clipboard as URL. If the clipboard contains no text,
 206      * nothing will be done.
 207      */
 208     void replaceUrlByClipboard();
 209
 210     /** Emits the signal hideToolTip(). */
 211     void emitHideToolTip();
 212
 213     /**
 214      * Returns the file item for the proxy index \a index of the view \a view.
 215      */
 216     KFileItem itemForIndex(const QModelIndex& index) const;
 217
 218 public slots:
 219     /**
 220      * Emits the signal itemTriggered() if the file item for the index \a index
 221      * is not null and the left mouse button has been pressed. If the item is
 222      * null, the signal itemEntered() is emitted.
 223      * The method should be invoked by the controller parent whenever the
 224      * user has triggered an item.
 225      */
 226     void triggerItem(const QModelIndex& index);
 227
 228     /**
 229      * Emits the signal tabRequested(), if the file item for the index \a index
 230      * represents a directory and when the middle mouse button has been pressed.
 231      * The method should be invoked by the controller parent.
 232      */
 233     void requestTab(const QModelIndex& index);
 234
 235     /**
 236      * Emits the signal itemEntered() if the file item for the index \a index
 237      * is not null. The method should be invoked by the controller parent
 238      * whenever the mouse cursor is above an item.
 239      */
 240     void emitItemEntered(const QModelIndex& index);
 241
 242     /**
 243      * Emits the signal viewportEntered(). The method should be invoked by
 244      * the controller parent whenever the mouse cursor is above the viewport.
 245      */
 246     void emitViewportEntered();
 247
 248 signals:
 249     /**
 250      * Is emitted if the URL for the Dolphin controller has been changed
 251      * to \a url.
 252      */
 253     void urlChanged(const KUrl& url);
 254
 255     /**
 256      * Is emitted if the view implementation requests a changing of the current
 257      * URL to \a url (see triggerUrlChangeRequest()).
 258      */
 259     void requestUrlChange(const KUrl& url);
 260
 261     /**
 262      * Is emitted if a context menu should be opened (see triggerContextMenuRequest()).
 263      * The abstract Dolphin view connects to this signal and will open the context menu.
 264      * @param pos       Position relative to the view widget where the
 265      *                  context menu should be opened. It is recommended
 266      *                  to get the corresponding model index from
 267      *                  this position.
 268      */
 269     void requestContextMenu(const QPoint& pos);
 270
 271     /**
 272      * Is emitted if the view has been activated by e. g. a mouse click.
 273      * The abstract Dolphin view connects to this signal to know the
 274      * destination view for the menu actions.
 275      */
 276     void activated();
 277
 278     /**
 279      * Is emitted if URLs have been dropped to the destination
 280      * path \a destPath. If the URLs have been dropped above an item of
 281      * the destination path, the item is indicated by \a destItem
 282      * (can be null, see KFileItem::isNull()).
 283      */
 284     void urlsDropped(const KFileItem& destItem,
 285                      const KUrl& destPath,
 286                      QDropEvent* event);
 287
 288     /**
 289      * Is emitted if the sorting has been changed to \a sorting by
 290      * the view implementation (see indicateSortingChanged().
 291      * The abstract Dolphin view connects to
 292      * this signal to update its menu action.
 293      */
 294     void sortingChanged(DolphinView::Sorting sorting);
 295
 296     /**
 297      * Is emitted if the sort order has been changed to \a order
 298      * by the view implementation (see indicateSortOrderChanged().
 299      * The abstract Dolphin view connects
 300      * to this signal to update its menu actions.
 301      */
 302     void sortOrderChanged(Qt::SortOrder order);
 303
 304     /**
 305      * Is emitted if the additional info has been changed to \a info
 306      * by the view implementation. The abstract Dolphin view connects
 307      * to this signal to update its menu actions.
 308      */
 309     void additionalInfoChanged(const KFileItemDelegate::InformationList& info);
 310
 311     /**
 312      * Is emitted if the activation state has been changed to \a active
 313      * by the abstract Dolphin view.
 314      * The view implementation might connect to this signal if custom
 315      * updates are required in this case.
 316      */
 317     void activationChanged(bool active);
 318
 319     /**
 320      * Is emitted if the item \a item should be triggered. The abstract
 321      * Dolphin view connects to this signal. If the item represents a directory,
 322      * the directory is opened. On a file the corresponding application is opened.
 323      * The item is null (see KFileItem::isNull()), when clicking on the viewport itself.
 324      */
 325     void itemTriggered(const KFileItem& item);
 326
 327     /**
 328      * Is emitted if the mouse cursor has entered the item
 329      * given by \a index (see emitItemEntered()).
 330      * The abstract Dolphin view connects to this signal.
 331      */
 332     void itemEntered(const KFileItem& item);
 333
 334     /**
 335      * Is emitted if a new tab should be opened for the URL \a url.
 336      */
 337     void tabRequested(const KUrl& url);
 338
 339     /**
 340      * Is emitted if the mouse cursor has entered
 341      * the viewport (see emitViewportEntered().
 342      * The abstract Dolphin view connects to this signal.
 343      */
 344     void viewportEntered();
 345
 346     /**
 347      * Is emitted if the view should change the zoom to \a level. The view implementation
 348      * must connect to this signal if it supports zooming.
 349      */
 350     void zoomLevelChanged(int level);
 351
 352     /**
 353      * Is emitted if the abstract view should hide an open tooltip.
 354      */
 355     void hideToolTip();
 356
 357 private slots:
 358     void updateMouseButtonState();
 359
 360 private:
 361     int m_zoomLevel;
 362     Qt::MouseButtons m_mouseButtons; // TODO: this is a workaround until  Qt-issue 176832 has been fixed
 363     KUrl m_url;
 364     DolphinView* m_dolphinView;
 365     QAbstractItemView* m_itemView;
 366 };
 367
 368 inline const DolphinView* DolphinController::dolphinView() const
 369 {
 370     return m_dolphinView;
 371 }
 372
 373 inline const KUrl& DolphinController::url() const
 374 {
 375     return m_url;
 376 }
 377
 378 inline QAbstractItemView* DolphinController::itemView() const
 379 {
 380     return m_itemView;
 381 }
 382
 383 inline int DolphinController::zoomLevel() const
 384 {
 385     return m_zoomLevel;
 386 }
 387
 388 #endif