[processing] Allow temporary folder to be temporarily changed through

the algorithm settings panel

src/gui/processing/qgsprocessingalgorithmdialogbase.cpp

@@ -159,6 +159,7 @@ QgsProcessingAlgorithmDialogBase::QgsProcessingAlgorithmDialogBase( QWidget *par
               mGeometryCheck = mContextOptionsWidget->invalidGeometryCheck();
               mDistanceUnits = mContextOptionsWidget->distanceUnit();
               mAreaUnits = mContextOptionsWidget->areaUnit();
+              mTemporaryFolderOverride = mContextOptionsWidget->temporaryFolder();
             } );
           }
         }
@@ -867,6 +868,7 @@ void QgsProcessingAlgorithmDialogBase::applyContextOverrides( QgsProcessingConte
     context->setInvalidGeometryCheck( mGeometryCheck );
     context->setDistanceUnit( mDistanceUnits );
     context->setAreaUnit( mAreaUnits );
+    context->setTemporaryFolder( mTemporaryFolderOverride );
   }
 }
 
@@ -946,6 +948,10 @@ QgsProcessingContextOptionsWidget::QgsProcessingContextOptionsWidget( QWidget *p
   mComboInvalidFeatureFiltering->addItem( tr( "Skip (Ignore) Features with Invalid Geometries" ), QgsFeatureRequest::GeometrySkipInvalid );
   mComboInvalidFeatureFiltering->addItem( tr( "Stop Algorithm Execution When a Geometry is Invalid" ), QgsFeatureRequest::GeometryAbortOnInvalid );
 
+  mTemporaryFolderWidget->setDialogTitle( tr( "Select Temporary Directory" ) );
+  mTemporaryFolderWidget->setStorageMode( QgsFileWidget::GetDirectory );
+  mTemporaryFolderWidget->lineEdit()->setPlaceholderText( tr( "Default" ) );
+
   mDistanceUnitsCombo->addItem( tr( "Default" ), QVariant::fromValue( Qgis::DistanceUnit::Unknown ) );
   for ( Qgis::DistanceUnit unit :
         {
@@ -1005,6 +1011,7 @@ QgsProcessingContextOptionsWidget::QgsProcessingContextOptionsWidget( QWidget *p
   connect( mComboInvalidFeatureFiltering, qOverload< int >( &QComboBox::currentIndexChanged ), this, &QgsPanelWidget::widgetChanged );
   connect( mDistanceUnitsCombo, qOverload< int >( &QComboBox::currentIndexChanged ), this, &QgsPanelWidget::widgetChanged );
   connect( mAreaUnitsCombo, qOverload< int >( &QComboBox::currentIndexChanged ), this, &QgsPanelWidget::widgetChanged );
+  connect( mTemporaryFolderWidget, &QgsFileWidget::fileChanged, this, &QgsPanelWidget::widgetChanged );
 }
 
 void QgsProcessingContextOptionsWidget::setFromContext( const QgsProcessingContext *context )
@@ -1012,6 +1019,7 @@ void QgsProcessingContextOptionsWidget::setFromContext( const QgsProcessingConte
   whileBlocking( mComboInvalidFeatureFiltering )->setCurrentIndex( mComboInvalidFeatureFiltering->findData( static_cast< int >( context->invalidGeometryCheck() ) ) );
   whileBlocking( mDistanceUnitsCombo )->setCurrentIndex( mDistanceUnitsCombo->findData( QVariant::fromValue( context->distanceUnit() ) ) );
   whileBlocking( mAreaUnitsCombo )->setCurrentIndex( mAreaUnitsCombo->findData( QVariant::fromValue( context->areaUnit() ) ) );
+  whileBlocking( mTemporaryFolderWidget )->setFilePath( context->temporaryFolder() );
 }
 
 QgsFeatureRequest::InvalidGeometryCheck QgsProcessingContextOptionsWidget::invalidGeometryCheck() const
@@ -1029,4 +1037,9 @@ Qgis::AreaUnit QgsProcessingContextOptionsWidget::areaUnit() const
   return mAreaUnitsCombo->currentData().value< Qgis::AreaUnit >();
 }
 
+QString QgsProcessingContextOptionsWidget::temporaryFolder()
+{
+  return mTemporaryFolderWidget->filePath();
+}
+
 ///@endcond

src/gui/processing/qgsprocessingalgorithmdialogbase.h

@@ -474,6 +474,7 @@ class GUI_EXPORT QgsProcessingAlgorithmDialogBase : public QDialog, public QgsPr
     QgsFeatureRequest::InvalidGeometryCheck mGeometryCheck = QgsFeatureRequest::InvalidGeometryCheck::GeometryAbortOnInvalid;
     Qgis::DistanceUnit mDistanceUnits = Qgis::DistanceUnit::Unknown;
     Qgis::AreaUnit mAreaUnits = Qgis::AreaUnit::Unknown;
+    QString mTemporaryFolderOverride;
 
     QString formatHelp( QgsProcessingAlgorithm *algorithm );
     void scrollToBottomOfLog();
@@ -558,6 +559,11 @@ class GUI_EXPORT QgsProcessingContextOptionsWidget : public QgsPanelWidget, priv
      */
     Qgis::AreaUnit areaUnit() const;
 
+    /**
+     * Returns the optional temporary folder override location.
+     */
+    QString temporaryFolder();
+
 };
 
 #endif

src/ui/processing/qgsprocessingcontextoptionsbase.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>448</width>
-    <height>197</height>
+    <height>328</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -43,7 +43,7 @@
         <x>0</x>
         <y>0</y>
         <width>448</width>
-        <height>197</height>
+        <height>328</height>
        </rect>
       </property>
       <layout class="QGridLayout" name="gridLayout" columnstretch="0,0">
@@ -54,26 +54,6 @@
          </property>
         </widget>
        </item>
-       <item row="3" column="0">
-        <spacer name="verticalSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="1" column="0">
-        <widget class="QLabel" name="label">
-         <property name="text">
-          <string>Invalid feature filtering</string>
-         </property>
-        </widget>
-       </item>
        <item row="2" column="0" colspan="2">
         <widget class="QGroupBox" name="groupBox">
          <property name="title">
@@ -103,6 +83,45 @@
          </layout>
         </widget>
        </item>
+       <item row="4" column="0">
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="1" column="0">
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>Invalid feature filtering</string>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="0" colspan="2">
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Environment Settings</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_3">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label_4">
+            <property name="text">
+             <string>Temporary folder</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QgsFileWidget" name="mTemporaryFolderWidget" native="true"/>
+          </item>
+         </layout>
+        </widget>
+       </item>
       </layout>
      </widget>
     </widget>
@@ -122,6 +141,12 @@
    <header>qgspanelwidget.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>QgsFileWidget</class>
+   <extends>QWidget</extends>
+   <header>qgsfilewidget.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>