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- now dynamically builds the file filter list for the raster dialog

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based on the currently available GDAL drivers [0]

- now register GDAL drivers when app is instantiated not when a raster
  layer is opened [1]

Notes:

[0] However, there exist drivers that have no corresponding file name
extension in their driver metadata, and so do not get appropriate
filters populated in the raster dialog.  Presumably the user can use
the default "All (*.*)" filter to load datasets of those types; this
probably should be tested.  Grep for appropriate "XXX" comments for
place to catch these types of raster drivers in
buildSupportedrasterFileFilter_().

[1] After all, it doesn't make sense to reload the drivers every time
a raster layer is opened.  Presumably these drivers are loaded once
and then remain static.

The vector layer dialog file filters aren't similarly dynamically
built.  (Yet.)


git-svn-id: http://svn.osgeo.org/qgis/trunk@784 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
mcoletti 2004-02-11 04:19:13 +00:00
parent 3eeb3c968b
commit ecb0ae7f7f
1 changed files with 173 additions and 28 deletions
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201
src/qgisapp.cpp
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@ -53,9 +53,17 @@
#include <qtextstream.h>
#include <qsocket.h>
#include <qinputdialog.h>
#include <qregexp.h>
#include <iostream>
#include <iomanip>
#ifndef GDAL_PRIV_H_INCLUDED
#include <gdal_priv.h>
#endif
#include "qgsrect.h"
#include "qgsmapcanvas.h"
#include "qgsmaplayer.h"
@ -216,7 +224,10 @@ QgisApp::QgisApp(QWidget * parent, const char *name, WFlags fl):QgisAppBase(pare
//
SplashScreen *mySplash = new SplashScreen();
mySplash->setStatus(tr("Loading QGIS..."));
GDALAllRegister(); // register all GDAL and OGR plug-ins
OGRRegisterAll();
QPixmap icon;
icon = QPixmap(qgis_xpm);
setIcon(icon);
@ -399,39 +410,173 @@ void QgisApp::addLayer(QStringList theLayerQStringList)
}
/**
Builds the list of file filter strings to later be used by
QgisApp::addRasterLayer()
We query GDAL for a list of supported raster formats; we then build
a list of file filter strings from that list. We return a string
that contains this list that is suitable for use in a a
QFileDialog::getOpenFileNames() call.
*/
static
void
buildSupportedRasterFileFilter_( QString & fileFilters )
{
// first get the GDAL driver manager
GDALDriverManager * driverManager = GetGDALDriverManager( );
if ( ! driverManager )
{
std::cerr << "unable to get GDALDriverManager\n";
return; // XXX good place to throw exception if we
} // XXX decide to do exceptions
// then iterate through all of the supported drivers, adding the
// corresponding file filter
GDALDriver * driver; // current driver
char ** driverMetadata; // driver metadata strings
QString driverLongName( "" ); // long name for the given driver
QString driverExtension( "" ); // file name extension for given driver
QStringList metadataTokens; // essentially the metadata string delimited by '='
// Grind through all the drivers and their respective metadata.
// We'll add a file filter for those drivers that have a file
// extension defined for them; the others, welll, even though
// theoreticaly we can open those files because there exists a
// driver for them, the user will have to use the "All Files" to
// open datasets with no explicitly defined file name extension.
// Note that file name extension strings are of the form
// "DMD_EXTENSION=.*". We'll also store the long name of the
// driver, which will be found in DMD_LONGNAME, which will have the
// same form.
for ( int i = 0; i < driverManager->GetDriverCount(); ++i )
{
driver = driverManager->GetDriver( i );
if ( ! driver )
{
std::cerr << "unable to get driver " << i << "\n";
}
// std::cerr << "got driver string " << driver->GetDescription() << "\n";
driverMetadata = driver->GetMetadata();
// presumably we know we've run out of metadta if either the
// address is 0, or the first character is null
while ( driverMetadata && '\0' != driverMetadata[0] )
{
metadataTokens = QStringList::split( "=", *driverMetadata );
// std::cerr << "\t" << *driverMetadata << "\n";
// XXX add check for malformed metadataTokens
// Note that it's oddly possible for their to be a
// DMD_EXTENSION with no corresponding defined extension
// string; so we check that there're more than two tokens.
if ( metadataTokens.count() > 1 )
{
if ( "DMD_EXTENSION" == metadataTokens[0] )
{
driverExtension = metadataTokens[1];
}
else if ( "DMD_LONGNAME" == metadataTokens[0] )
{
driverLongName = metadataTokens[1];
// remove any superfluous (.*) strings at the end as
// they'll confuse QFileDialog::getOpenFileNames()
driverLongName.remove( QRegExp("\\(.*\\)$") );
}
}
// if we have both the file name extension and the long name,
// then we've all the information we need for the current
// driver; therefore emit a file filter string and move to
// the next driver
if ( ! (driverExtension.isEmpty() || driverLongName.isEmpty()) )
{
// XXX add check for SDTS; in that case we want (*CATD.DDF)
fileFilters +=
driverLongName + "(*." + driverExtension.lower()
+ " *." + driverExtension.upper() + ");;";
driverExtension = driverLongName = ""; // reset for next driver
continue; // ... to next driver, if any.
}
++driverMetadata;
} // each metadata item
// XXX if you want to insert whining about formats with no
// XXX extensions, this is where you'd check for it and complain
driverExtension = driverLongName = ""; // reset for next driver
} // each loaded GDAL driver
// can't forget the default case
fileFilters += "All files (*.*)";
} // buildSupportedRasterFileFilter_()
void QgisApp::addRasterLayer()
{
QString fileFilters;
QString myFileTypeQString;
buildSupportedRasterFileFilter_( fileFilters );
// std::cerr << fileFilters << "\n";
QString selectedFilter;
// QString myArcInfoBinaryGridFilterString = "Arc Info Binary Grid (*.adf)";
// QString myArcInfoAsciiGridFilterString = "Arc Info Ascii Grid (*.asc;*.grd)";
// QString myERDASFilterString = "ERDAS Imagine (*.img)";
// QString myGeoTiffFilterString = "Geo tiff (*.tif)";
// QString myUSGSAsciiDemFilterString = "USGS Ascii DEM (*.dem;*.DEM)";
// QString myGrassFilterString = "Grass raster (*.*)";
// QString mySDTSFilterString = "SDTS (*CATD*.DDF)";
// QString myAllRasterFormatsFilterString = "All Rasters (*.asc;*.grd;*.img;*.tif;*.png;*.jpg;*.dem;*.DEM;*.DDF)";
// QString myOtherFormatsFilterString = "Other (*.*)";
// //QString myBilFilterString="Band Interleaved by Line (*.bil)";
// //QString myJpgFilterString="Geo jpg (*.jpg)";
QStringList selectedFilenames =
QFileDialog::getOpenFileNames( fileFilters,
"", // initial dir
this, // parent dialog
"OpenFileDialog", // QFileDialog qt object name
"Select file name and type", // caption
&selectedFilter // the pointer to store selected filter
);
// cout << "Selected filetype filter is : " << myFileTypeQString << endl;
addRasterLayer( selectedFilenames );
} // QgisApp::addRasterLayer()
QString myArcInfoBinaryGridFilterString = "Arc Info Binary Grid (*.adf)";
QString myArcInfoAsciiGridFilterString = "Arc Info Ascii Grid (*.asc;*.grd)";
QString myERDASFilterString = "ERDAS Imagine (*.img)";
QString myGeoTiffFilterString = "Geo tiff (*.tif)";
QString myUSGSAsciiDemFilterString = "USGS Ascii DEM (*.dem;*.DEM)";
QString myGrassFilterString = "Grass raster (*.*)";
QString mySDTSFilterString = "SDTS (*CATD*.DDF)";
QString myAllRasterFormatsFilterString = "All Rasters (*.asc;*.grd;*.img;*.tif;*.png;*.jpg;*.dem;*.DEM;*.DDF)";
QString myOtherFormatsFilterString = "Other (*.*)";
//QString myBilFilterString="Band Interleaved by Line (*.bil)";
//QString myJpgFilterString="Geo jpg (*.jpg)";
QStringList myFileNameQStringList = QFileDialog::getOpenFileNames(myAllRasterFormatsFilterString + ";;" +
myArcInfoBinaryGridFilterString + ";;" +
myArcInfoAsciiGridFilterString + ";;" +
myERDASFilterString + ";;" +
//myBilFilterString + ";;" +
//myJpgFilterString + ";;" +
myGeoTiffFilterString + ";;" + myGrassFilterString + ";;" + myUSGSAsciiDemFilterString + ";;" + mySDTSFilterString + ";;" + myOtherFormatsFilterString, //filters to select
"", //initial dir
this, //parent dialog
"OpenFileDialog", //QFileDialog qt object name
"Select file name and type", //caption
&myFileTypeQString //the pointer to store selected filter
);
//cout << "Selected filetype filter is : " << myFileTypeQString << endl;
addRasterLayer(myFileNameQStringList);
} //end of addRasterLayer()
void QgisApp::addRasterLayer(QStringList theFileNameQStringList)