NPAL16033: Pb with print when the list is too long

setText method modified. Previously exceptions occurred if one of paragraphs of the input string "s" is too long.  Now long paragraph is limited with threshold numbers of characters and finished by " ..." string. Note that length of the first paragraph of the string is verified only because it is enough for bug fixing. If it will be insufficient for other cases then more complicated check should be implemented. At present it is not done because of possible performance problem.

Bug NPAL16035: Pb with the history list of salome (GUI)

Now in python console after use of history of commands view is scrolled at the left side of console if current command can be completely displayed on the screen.

void scrollViewAfterHistoryUsing( const QString& command ); method added

diff --git a/src/PythonConsole/PythonConsole_PyEditor.cxx b/src/PythonConsole/PythonConsole_PyEditor.cxx
index cdc4bb78e6911f675d59ab477ad3b35d4b221523..e28ddcf0c399a2c2bb47b08c214b6f36b49e35b1 100755 (executable)
--- a/src/PythonConsole/PythonConsole_PyEditor.cxx
+++ b/src/PythonConsole/PythonConsole_PyEditor.cxx
@@ -37,6 +37,7 @@
 #include <qdragobject.h>
 #include <qapplication.h>
 #include <qpopupmenu.h>
+#include <qfontmetrics.h>
 
 using namespace std;
 
@@ -137,7 +138,43 @@ void PythonConsole_PyEditor::setText(QString s)
 {
   int para=paragraphs()-1;
   int col=paragraphLength(para);
-  insertAt(s,para,col);
+  
+  // Limit length of the string because exception may occur if string too long (NPAL16033)
+  // Exception occurs if  one of paragraphs of the input string "s" is too long.  Now long 
+  // paragraph is limited with threshold numbers of characters and finished by " ..." string. 
+  // Note that first paragraph of the string is checked only because it is enough for bug fixing. 
+  // If it will be insufficient for other cases then more complicated check should be implemented.
+  // At present it is not done because of possible performance problem.
+  
+  static int threshold = 2000000;
+  long strLength = s.length();
+  if ( col + strLength <= threshold || s.find( '\n' ) < threshold )
+    insertAt(s,para,col);
+  else
+  {
+    if ( col >= threshold )
+    {
+      if ( text( para ).right( 5 )  != QString( " ...\n" ) )
+        insertAt(" ...\n",para,col);
+    }
+    else
+    {
+      long n = threshold - col; 
+      s.truncate( n );
+      if ( n >= 5 )
+      {
+        s[ n - 5 ] = QChar( ' ' );
+        s[ n - 4 ] = QChar( '.' );
+        s[ n - 3 ] = QChar( '.' );
+        s[ n - 2 ] = QChar( '.' );
+        s[ n - 1 ] = QChar( '\n' );
+      }
+      else 
+        s = " ...\n";
+      insertAt(s,para,col);
+    }
+  }
+  
   int n = paragraphs()-1;  
   setCursorPosition( n, paragraphLength(n)); 
 }
@@ -380,20 +417,21 @@ void PythonConsole_PyEditor::keyPressEvent( QKeyEvent* e )
        moveCursor( QTextEdit::MoveUp, false );
       }
       else { 
-       QString histLine = _currentPrompt;
-       if ( ! _isInHistory ) {
-         _isInHistory = true;
-         _currentCommand = text( endLine ).remove( 0, PROMPT_SIZE );
-         _currentCommand.truncate( _currentCommand.length() - 1 );
-       }
-       QString previousCommand = myInterp->getPrevious();
-       if ( previousCommand.compare( BEGIN_HISTORY_PY ) != 0 )
-  {
-    removeParagraph( endLine );
-         histLine.append( previousCommand );
-    append( histLine );
-       }
-       moveCursor( QTextEdit::MoveEnd, false );
+        QString histLine = _currentPrompt;
+        if ( ! _isInHistory ) {
+          _isInHistory = true;
+          _currentCommand = text( endLine ).remove( 0, PROMPT_SIZE );
+          _currentCommand.truncate( _currentCommand.length() - 1 );
+        }
+        QString previousCommand = myInterp->getPrevious();
+        if ( previousCommand.compare( BEGIN_HISTORY_PY ) != 0 )
+        {
+          removeParagraph( endLine );
+          histLine.append( previousCommand );
+          append( histLine );
+        }
+        moveCursor( QTextEdit::MoveEnd, false );
+        scrollViewAfterHistoryUsing( previousCommand ); // NPAL16035
       }
       break;
     }
@@ -431,6 +469,7 @@ void PythonConsole_PyEditor::keyPressEvent( QKeyEvent* e )
          }
        }
        moveCursor( QTextEdit::MoveEnd, false );
+  scrollViewAfterHistoryUsing( nextCommand ); // NPAL16035
       }
       break;
     }
@@ -764,3 +803,23 @@ QPopupMenu* PythonConsole_PyEditor::createPopupMenu( const QPoint& pos )
 
   return popup;
 }
+
+/*!
+  Scrolls view after use of history (Up/Down keys)to the left position if length 
+  of command less than visible width of the view 
+*/
+void PythonConsole_PyEditor::scrollViewAfterHistoryUsing( const QString& command )
+{
+  if ( !command.isEmpty() )
+  {
+    int aCommandLength = QFontMetrics( currentFont() ).width( command );
+    int aVisibleWidth = visibleWidth();
+    if ( aCommandLength < aVisibleWidth )
+    {
+      QScrollBar* aBar = horizontalScrollBar();
+      if ( aBar )
+        aBar->setValue( aBar->minValue() );
+    }
+  }
+}
+