Quantum GIS API Documentation
1.7.4
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A maptip is a class to display a tip on a map canvas when a mouse is hovered over a feature. More...
#include <qgsmaptip.h>
Public Member Functions | |
QgsMapTip () | |
Default constructor. | |
virtual | ~QgsMapTip () |
Destructor. | |
void | showMapTip (QgsMapLayer *thepLayer, QgsPoint &theMapPosition, QPoint &thePixelPosition, QgsMapCanvas *mpMapCanvas) |
Show a maptip at a given point on the map canvas. | |
void | clear (QgsMapCanvas *mpMapCanvas) |
Clear the current maptip if it exists. | |
Private Member Functions | |
QString | fetchFeature (QgsMapLayer *thepLayer, QgsPoint &theMapPosition, QgsMapCanvas *thepMapCanvas) |
Private Attributes | |
bool | mMapTipVisible |
QPoint | mLastPosition |
A maptip is a class to display a tip on a map canvas when a mouse is hovered over a feature.
Definition at line 28 of file qgsmaptip.h.
QgsMapTip::~QgsMapTip | ( | ) | [virtual] |
Destructor.
Definition at line 35 of file qgsmaptip.cpp.
void QgsMapTip::clear | ( | QgsMapCanvas * | mpMapCanvas | ) |
Clear the current maptip if it exists.
mpMapCanvas | the canvas from which the tip should be cleared. |
Definition at line 69 of file qgsmaptip.cpp.
References mLastPosition, and mMapTipVisible.
QString QgsMapTip::fetchFeature | ( | QgsMapLayer * | thepLayer, |
QgsPoint & | theMapPosition, | ||
QgsMapCanvas * | thepMapCanvas | ||
) | [private] |
Definition at line 80 of file qgsmaptip.cpp.
References QgsVectorDataProvider::attributeIndexes(), QgsFeature::attributeMap(), QGis::DEFAULT_IDENTIFY_RADIUS, QgsMapCanvas::extent(), QgsVectorDataProvider::fields(), QgsVectorDataProvider::nextFeature(), QgsVectorDataProvider::select(), QgsRectangle::setXMaximum(), QgsRectangle::setXMinimum(), QgsRectangle::setYMaximum(), QgsRectangle::setYMinimum(), QgsRectangle::width(), QgsPoint::x(), and QgsPoint::y().
Referenced by showMapTip().
void QgsMapTip::showMapTip | ( | QgsMapLayer * | thepLayer, |
QgsPoint & | theMapPosition, | ||
QPoint & | thePixelPosition, | ||
QgsMapCanvas * | mpMapCanvas | ||
) |
Show a maptip at a given point on the map canvas.
thepLayer | a qgis vector map layer pointer that will be used to provide the attribute data for the map tip. |
theMapPosition | a reference to the position of the cursor in map coordinatess. |
thePixelPosition | a reference to the position of the cursor in pixel coordinates. |
mpMapCanvas | a map canvas on which the tip is drawn |
Definition at line 40 of file qgsmaptip.cpp.
References fetchFeature(), mLastPosition, and mMapTipVisible.
QPoint QgsMapTip::mLastPosition [private] |
Definition at line 64 of file qgsmaptip.h.
Referenced by clear(), and showMapTip().
bool QgsMapTip::mMapTipVisible [private] |
Definition at line 61 of file qgsmaptip.h.
Referenced by clear(), QgsMapTip(), and showMapTip().