Bug 120773

The RMB menu for datasource entries could be:
- Check updates
- Reload
- Change data file (this would call the change data file dialog, with the vectors coming from that datasource pre-selected)
- Show metadata (see also bug #120749)
- Change type (to be able to force the right type when the current heuristic gives the wrong result) : this would bring up a dialog with the list of available datasource plugins sorted by decreasing relevance, based on the values returned by understands...().

SVN commit 546593 by staikos:

Add a dialog that shows metadata for datasources from the data manager.  It's
low impact here.  I haven't really tested displaying any data since I don't have
any datasource that has metadata right now.  If any source plugin wants to put
it into variables, it can do it itself.  Nothing ever precluded this.  I'm not
going to put anything inline in the data manager because it's just too much data
and the horizontal scroll bar will be quite large. Also we'd have to strip out
many characters (and newlines).
FEATURE: 120749, 120773



 M  +1 -0      Makefile.am  
 A             datasourcemetadatadialog.ui  
 A             datasourcemetadatadialog.ui.h   [License: no copyright]
 M  +36 -2     kstdatamanager_i.cpp  
 M  +1 -0      kstdatamanager_i.h  


--- trunk/extragear/graphics/kst/src/libkstapp/Makefile.am #546592:546593
@@ -70,6 +70,7 @@
 	kstfilterdialog_i.cpp \
 	extensionmgr.cpp \
 	ksteditviewobjectdialog_i.cpp \
+	datasourcemetadatadialog.ui \
 	kstdatamanager_i.cpp \
 	kstviewmanager_i.cpp \
 	kstvectordialog_i.cpp \
--- trunk/extragear/graphics/kst/src/libkstapp/kstdatamanager_i.cpp #546592:546593
@@ -27,6 +27,7 @@
 #include <kstandarddirs.h>
 
 // application specific includes
+#include "datasourcemetadatadialog.h"
 #include "kst2dplot.h"
 #include "kstcurvedialog_i.h"
 #include "kstcsddialog_i.h"
@@ -473,14 +474,44 @@
 }
 
 
+void KstObjectItem::showMetadata() {
+  if (_rtti == RTTI_OBJ_DATA_VECTOR) {
+    DataSourceMetaDataDialog *dlg = new DataSourceMetaDataDialog(_dm, 0, false, WDestructiveClose);
+    KstReadLocker vl(&KST::vectorList.lock());
+    KstVectorList::Iterator m = KST::vectorList.findTag(_name);
+    KstRVectorPtr r = kst_cast<KstRVector>(*m);
+    KstDataSourcePtr dsp;
+    if (r) {
+      r->readLock();
+      dsp = r->dataSource();
+      r->readUnlock();
+    }
+    dlg->setDataSource(dsp);
+    dlg->show();
+  } else if (_rtti == RTTI_OBJ_DATA_MATRIX) {
+    DataSourceMetaDataDialog *dlg = new DataSourceMetaDataDialog(_dm, 0, false, WDestructiveClose);
+    KstReadLocker ml(&KST::matrixList.lock());
+    KstMatrixList::Iterator m = KST::matrixList.findTag(_name);
+    KstRMatrixPtr r = kst_cast<KstRMatrix>(*m);
+    KstDataSourcePtr dsp;
+    if (r) {
+      r->readLock();
+      dsp = r->dataSource();
+      r->readUnlock();
+    }
+    dlg->setDataSource(dsp);
+    dlg->show();
+  }
+}
+
+
 void KstObjectItem::activateHint(int id) {
   KstDataObjectPtr d = dataObject();
   const KstCurveHintList* hints = d->curveHints();
   int cnt = 0;
   for (KstCurveHintList::ConstIterator i = hints->begin(); i != hints->end(); ++i) {
     if (cnt == id) {
-      KstBaseCurvePtr c = (*i)->makeCurve(KST::suggestCurveName(d->tagName(), false),
-          KstColorSequence::next());
+      KstBaseCurvePtr c = (*i)->makeCurve(KST::suggestCurveName(d->tagName(), false), KstColorSequence::next());
       if (c) {
         KST::dataObjectList.lock().writeLock();
         KST::dataObjectList.append(c.data());
@@ -917,6 +948,7 @@
     id = m->insertItem(i18n("Make Cumulative &Spectral Decay..."), koi, SLOT(makeCSD()));
     id = m->insertItem(i18n("Make &Histogram..."), koi, SLOT(makeHistogram()));
     id = m->insertItem(i18n("&Reload"), koi, SLOT(reload()));
+    id = m->insertItem(i18n("Meta &Data"), koi, SLOT(showMetadata()));
   } else if (koi->rtti() == RTTI_OBJ_VECTOR) {
     id = m->insertItem(i18n("&Make Curve..."), koi, SLOT(makeCurve()));
     id = m->insertItem(i18n("Make &Power Spectrum..."), koi, SLOT(makePSD()));
@@ -925,6 +957,7 @@
   } else if (koi->rtti() == RTTI_OBJ_DATA_MATRIX) {
     id = m->insertItem(i18n("Make &Image..."), koi, SLOT(makeImage()));  
     id = m->insertItem(i18n("&Reload"), koi, SLOT(reload()));
+    id = m->insertItem(i18n("Meta &Data"), koi, SLOT(showMetadata()));
   } else if (koi->rtti() == RTTI_OBJ_MATRIX || koi->rtti() == RTTI_OBJ_STATIC_MATRIX) {
     id = m->insertItem(i18n("Make &Image..."), koi, SLOT(makeImage()));
   } else if ((c = kst_cast<KstBaseCurve>(koi->dataObject()))) {
@@ -986,5 +1019,6 @@
   }
 }
 
+
 #include "kstdatamanager_i.moc"
 // vim: ts=2 sw=2 et
--- trunk/extragear/graphics/kst/src/libkstapp/kstdatamanager_i.h #546592:546593
@@ -92,6 +92,7 @@
     void makePSD();
     void makeImage();
     void reload();
+    void showMetadata();
 
   signals:
     void updated();

Why not add a checkbox to the ASCII datasource to put header lines into a "header" metadata variable ?
This would be a good starting point I think to show a concrete example of how data can be passed around.