QGIS API Documentation  3.20.0-Odense (decaadbb31)
qgsmaptoolidentifyfeature.cpp
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1 /***************************************************************************
2  qgsmaptoolidentifyfeature.cpp
3  --------------------------------------
4  Date : 22.5.2014
5  Copyright : (C) 2014 Denis Rouzaud
6  Email : [email protected]
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 
18 #include "qgsmapcanvas.h"
19 #include "qgsmapmouseevent.h"
20 
22  : QgsMapToolIdentify( canvas )
23  , mLayer( vl )
24 {
25  mToolName = tr( "Identify feature" );
26 
27  // set cursor
28  mCursor = QCursor( Qt::CrossCursor );
29 }
30 
32 {
33 
34  QgsPointXY point = mCanvas->getCoordinateTransform()->toMapCoordinates( e->x(), e->y() );
35 
36  QList<IdentifyResult> results;
37  if ( !identifyVectorLayer( &results, mLayer, point ) )
38  return;
39 
40  // TODO: display a menu when several features identified
41 
42  emit featureIdentified( results[0].mFeature );
43  emit featureIdentified( results[0].mFeature.id() );
44 }
45 
47 {
48  if ( e->key() == Qt::Key_Escape )
49  {
50  mCanvas->unsetMapTool( this );
51  }
52 }
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:86
void unsetMapTool(QgsMapTool *mapTool)
Unset the current map tool or last non zoom tool.
const QgsMapToPixel * getCoordinateTransform()
Gets the current coordinate transform.
A QgsMapMouseEvent is the result of a user interaction with the mouse on a QgsMapCanvas.
QgsPointXY toMapCoordinates(int x, int y) const
Transform device coordinates to map (world) coordinates.
void featureIdentified(const QgsFeature &)
QgsMapToolIdentifyFeature(QgsMapCanvas *canvas, QgsVectorLayer *vl=nullptr)
QgsMapToolIdentifyFeature is a map tool to identify a feature on a chosen layer.
void keyPressEvent(QKeyEvent *e) override
Key event for overriding. Default implementation does nothing.
void canvasReleaseEvent(QgsMapMouseEvent *e) override
Mouse release event for overriding. Default implementation does nothing.
Map tool for identifying features in layers.
bool identifyVectorLayer(QList< QgsMapToolIdentify::IdentifyResult > *results, QgsVectorLayer *layer, const QgsPointXY &point, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
Performs the identification against a given vector layer.
QgsMapCanvas * mCanvas
The pointer to the map canvas.
Definition: qgsmaptool.h:297
QString mToolName
The translated name of the map tool.
Definition: qgsmaptool.h:315
QCursor mCursor
The cursor used in the map tool.
Definition: qgsmaptool.h:300
A class to represent a 2D point.
Definition: qgspointxy.h:59
Represents a vector layer which manages a vector based data sets.