sharpetronics/QGIS
1
0
Fork 0
mirror of https://github.com/qgis/QGIS.git synced 2025-11-04 00:04:25 -05:00
Code Issues Packages Projects Releases Wiki Activity

Add CASE and CASE ELSE to expression builder groups

Browse Source 
- Use readAll() for function help to preserve html
This commit is contained in:
Nathan Woodrow 2012-07-22 00:28:39 +10:00
parent d5f16c7cf5
commit 0cd93a2378
3 changed files with 73 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
resources/function_help/CASE ELSE-en_US Normal file
View File

@ -0,0 +1,32 @@
<h3>CASE statement</h3>
A conditional statement that can be used to evaluate exissions and
return a result.
<h4>Syntax</h4>
<pre>
CASE
WHEN <i>expression</i> THEN <i>result</i>
[ ...n ]
ELSE <i>result</i>
END
</pre>
[ ] marks optional statements
<h4>Arguments</h4>
<!-- List args for functions here-->
<i> WHEN expression</i> - The expression to evaluate. <br>
<i> THEN result</i> - If <i>expression</i> evaluates True then <i>result</i> is returned. <br>
<i> ELSE result</i> - If <i>expression</i> evaluates False then <i>result</i> is returned. <br>
<h4>Example</h4>
<!-- Show example of function.-->
<pre>
CASE
WHEN <i>"column" IS NULL</i> THEN <i>'None'</i>
ELSE <i>"column"</i>
END
</pre>

31
resources/function_help/CASE-en_US Normal file
View File

@ -0,0 +1,31 @@
<h3>CASE statement</h3>
A conditional statement that can be used to evaluate exissions and
return a result.
<h4>Syntax</h4>
<pre>
CASE
WHEN <i>expression</i> THEN <i>result</i>
[ ...n ]
[ ELSE <i>result</i> ]
END
</pre>
[ ] marks optional statements
<h4>Arguments</h4>
<!-- List args for functions here-->
<i> WHEN expression</i> - The expression to evaluate. <br>
<i> THEN result</i> - If <i>expression</i> evaluates True then <i>result</i> is returned. <br>
<i> ELSE result</i> - If <i>expression</i> evaluates False then <i>result</i> is returned. <br>
<h4>Example</h4>
<!-- Show example of function.-->
<pre>
CASE
WHEN <i>"column" IS NULL</i> THEN <i>'None'</i>
END
</pre>

20
src/gui/qgsexpressionbuilderwidget.cpp
View File

@ -79,6 +79,10 @@ QgsExpressionBuilderWidget::QgsExpressionBuilderWidget( QWidget *parent )
registerItem( tr( "Operators" ), "AND", " AND " ); registerItem( tr( "Operators" ), "AND", " AND " );
registerItem( tr( "Operators" ), "NOT", " NOT " ); registerItem( tr( "Operators" ), "NOT", " NOT " );
QString casestring = "CASE WHEN condition THEN result END";
QString caseelsestring = "CASE WHEN condition THEN result ELSE result END";
registerItem( tr( "Conditionals" ), "CASE", casestring );
registerItem( tr( "Conditionals" ), "CASE ELSE", caseelsestring );
// Load the functions from the QgsExpression class // Load the functions from the QgsExpression class
int count = QgsExpression::functionCount(); int count = QgsExpression::functionCount();
@ -380,9 +384,9 @@ void QgsExpressionBuilderWidget::setExpressionState( bool state )
mExpressionValid = state; mExpressionValid = state;
} }
QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* functionName ) QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* expressionItem )
{ {
if ( functionName == NULL ) if ( expressionItem == NULL )
return ""; return "";
// set up the path to the help file // set up the path to the help file
@ -410,9 +414,9 @@ QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* functio
lang = "en_US"; lang = "en_US";
} }
QString name = functionName->text(); QString name = expressionItem->text();
if ( functionName->getItemType() == QgsExpressionItem::Field ) if ( expressionItem->getItemType() == QgsExpressionItem::Field )
name = "Field"; name = "Field";
QString fullHelpPath = helpFilesPath + name + "-" + lang; QString fullHelpPath = helpFilesPath + name + "-" + lang;
@ -434,7 +438,7 @@ QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* functio
missingError += tr( "It was neither available in your language (%1) nor English." ).arg( lang ); missingError += tr( "It was neither available in your language (%1) nor English." ).arg( lang );
// try en_US next // try en_US next
fullHelpPath = helpFilesPath + functionName->text() + "-en_US"; fullHelpPath = helpFilesPath + name + "-en_US";
file.setFileName( fullHelpPath ); file.setFileName( fullHelpPath );
} }
} }
@ -449,11 +453,7 @@ QString QgsExpressionBuilderWidget::loadFunctionHelp( QgsExpressionItem* functio
{ {
QTextStream in( &file ); QTextStream in( &file );
in.setCodec( "UTF-8" ); // Help files must be in Utf-8 in.setCodec( "UTF-8" ); // Help files must be in Utf-8
while ( !in.atEnd() ) helpContents = in.readAll();
{
QString line = in.readLine();
helpContents += line;
}
} }
file.close(); file.close();