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Merged maptips-branch 7939:7967 into trunk
git-svn-id: http://svn.osgeo.org/qgis/trunk@7968 c8812cc2-4d05-0410-92ff-de0c093fc19c
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /*************************************************************************** | ||
| qgsmaptips.cpp - Query a layer and show a maptip on the canvas | ||
| --------------------- | ||
| begin : October 2007 | ||
| copyright : (C) 2007 by Gary Sherman | ||
| email : sherman @ mrcc dot com | ||
| *************************************************************************** | ||
| * * | ||
| * This program is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 2 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| ***************************************************************************/ | ||
| // QGIS includes | ||
| #include <qgsmapcanvas.h> | ||
| #include <qgsmaplayer.h> | ||
| #include <qgsvectordataprovider.h> | ||
| #include <qgsfield.h> | ||
|
|
||
| // Qt includes | ||
| #include <QPoint> | ||
| #include <QToolTip> | ||
| #include <QSettings> | ||
|
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| #include "qgsmaptip.h" | ||
|
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| QgsMapTip::QgsMapTip () | ||
| { | ||
| // init the visible flag | ||
| mMapTipVisible = false; | ||
| } | ||
|
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| QgsMapTip::~QgsMapTip() | ||
| { | ||
|
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| } | ||
|
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| void QgsMapTip::showMapTip ( QgsMapLayer * thepLayer, | ||
| QgsPoint & theMapPosition, | ||
| QPoint & thePixelPosition, | ||
| QgsMapCanvas *thepMapCanvas ) | ||
| { | ||
| // Do the search using the active layer and the preferred label | ||
| // field for the layer. The label field must be defined in the layer configuration | ||
| // file/database. The code required to do this is similar to identify, except | ||
| // we only want the first qualifying feature and we will only display the | ||
| // field defined as the label field in the layer configuration file/database. | ||
| // | ||
| // TODO: Define the label (display) field for each map layer in the map configuration file/database | ||
|
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| // Show the maptip on the canvas | ||
| QString myTipText = fetchFeature ( thepLayer, theMapPosition, thepMapCanvas ); | ||
| if ( myTipText.length() > 0 ) | ||
| { | ||
| mMapTipVisible = true; | ||
| QToolTip::showText ( thepMapCanvas->mapToGlobal ( thePixelPosition ), myTipText, thepMapCanvas ); | ||
| // store the point so we can use it to clear the maptip later | ||
| mLastPosition = thePixelPosition; | ||
| } | ||
| else | ||
| { | ||
| mMapTipVisible = false; | ||
| } | ||
|
|
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| } | ||
|
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| void QgsMapTip::clear ( QgsMapCanvas *mpMapCanvas ) | ||
| { | ||
| if ( mMapTipVisible ) | ||
| { | ||
| // set the maptip to blank | ||
| QToolTip::showText ( mpMapCanvas->mapToGlobal ( mLastPosition ), "", mpMapCanvas ); | ||
| // reset the visible flag | ||
| mMapTipVisible = false; | ||
| } | ||
| } | ||
|
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| QString QgsMapTip::fetchFeature ( QgsMapLayer *layer, QgsPoint & mapPosition, QgsMapCanvas *mpMapCanvas ) | ||
| { | ||
| // Default return value | ||
| QString maptipText = ""; | ||
| // Protection just in case we get passed a null layer | ||
| if(layer) | ||
| { | ||
| // Get the setting for the search radius from user preferences, if it exists | ||
| QSettings settings; | ||
| double identifyValue = settings.value ( "/Map/identifyRadius", QGis::DEFAULT_IDENTIFY_RADIUS ).toDouble(); | ||
|
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||
| // create the search rectangle | ||
| double searchRadius = mpMapCanvas->extent().width() * ( identifyValue / 100.0 ); | ||
| QgsRect r; | ||
| r.setXmin ( mapPosition.x() - searchRadius ); | ||
| r.setXmax ( mapPosition.x() + searchRadius ); | ||
| r.setYmin ( mapPosition.y() - searchRadius ); | ||
| r.setYmax ( mapPosition.y() + searchRadius ); | ||
|
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||
| // Get the data provider | ||
| QgsVectorDataProvider* dataProvider = dynamic_cast<QgsVectorLayer*> ( layer )->getDataProvider(); | ||
| // Fetch the attribute list for the layer | ||
| QgsAttributeList allAttributes = dataProvider->allAttributesList(); | ||
| // Select all attributes within the search radius | ||
| dataProvider->select ( allAttributes, r, true, true ); | ||
| // Feature to hold the results of the fetch | ||
| QgsFeature feature; | ||
| // Get the field list for the layer | ||
| const QgsFieldMap& fields = dataProvider->fields(); | ||
| // Get the label (display) field for the layer | ||
| QString fieldIndex = dynamic_cast<QgsVectorLayer*> ( layer )->displayField(); | ||
| if ( dataProvider->getNextFeature ( feature ) ) | ||
| { | ||
| // if we get a feature, pull out the display field and set the maptip text to its value | ||
| QgsAttributeMap attributes = feature.attributeMap(); | ||
| for ( QgsAttributeMap::const_iterator it = attributes.begin(); it != attributes.end(); ++it ) | ||
| { | ||
|
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| if ( fields[it.key() ].name() == fieldIndex ) | ||
| { | ||
| maptipText = it->toString(); | ||
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| } | ||
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| } | ||
| } | ||
| } | ||
| // return the map tip | ||
| return maptipText; | ||
| } | ||
|
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