2 Situare - A location system for Facebook
3 Copyright (C) 2010 Ixonos Plc. Authors:
5 Sami Rämö - sami.ramo@ixonos.com
7 Situare is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License
9 version 2 as published by the Free Software Foundation.
11 Situare is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Situare; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
25 #include <QGraphicsView>
28 * @brief Map view widget
30 * @author Sami Rämö - sami.ramo (at) ixonos.com
32 class MapView : public QGraphicsView
40 * @param parent Parent
42 MapView(QWidget *parent = 0);
44 /*******************************************************************************
45 * BASE CLASS INHERITED AND REIMPLEMENTED MEMBER FUNCTIONS
46 ******************************************************************************/
49 * @brief Called when view is resized.
51 * @param event resize event
53 void resizeEvent(QResizeEvent *event);
57 * @brief Event handler for mouse move events
59 * Does calculate mouse movement delta from last event position and new view center
60 * based on that delta. Saves current event position for next round. Emits viewScrolled
61 * signal and doesn't actually scroll the view.
62 * @param event Mouse event
64 void mouseMoveEvent(QMouseEvent *event);
67 * @brief Event handler for mouse press events
69 * Saves inial values for mouse and scene location for dragging view.
70 * @param event Mouse event
72 void mousePressEvent(QMouseEvent *event);
75 * @brief Event handler for timer events, used for smooth zoom effect
79 void timerEvent(QTimerEvent *event);
81 /*******************************************************************************
82 * MEMBER FUNCTIONS AND SLOTS
83 ******************************************************************************/
86 * @brief Slot for centering view to new location
88 * @param sceneCoordinate Scene coordinates of the new center point
90 void centerToSceneCoordinates(QPoint sceneCoordinate);
93 * @brief Set zoom level of the view
95 * @param zoomLevel Zoom level
97 void setZoomLevel(int zoomLevel);
101 * @brief get current horizontal scale (vertical should be same)
103 * @return qreal Current horizontal scale value
105 qreal currentScale();
107 /*******************************************************************************
109 ******************************************************************************/
112 * @brief Signal for view resize events.
114 * Signal is emitted when view has been resized.
115 * @param size view size
117 void viewResized(const QSize &size);
120 * @brief Signal for view scroll events
122 * Signal is emitted when view is scrolled.
123 * @param sceneCoordinate Scene coordinates of the new center point of the view
125 void viewScrolled(QPoint sceneCoordinate);
128 * @brief Signal for updating view content
130 * Signal is emitted when view content needs an update.
131 * @param viewTopLeft Scene coordinate of the viewport top left corner
133 void viewContentChanged(QPoint viewTopLeft);
135 /*******************************************************************************
137 ******************************************************************************/
139 QPoint m_mousePosition; ///< Previous mouse event position
140 QPoint m_scenePosition; ///< New center position
141 int m_timerID; ///< ID number of the timer used for smooth zoom effect
142 qreal m_zoomScaleDelta; ///< Scaling factor delta for smooth zoom transition effect
143 qreal m_zoomTargetScale; ///< Scaling factor of the target zoom level