Spreadsheet: Added auto completer.

src/Mod/Spreadsheet/Gui/Sheet.ui

@@ -27,7 +27,7 @@
       </widget>
      </item>
      <item>
-      <widget class="QLineEdit" name="cellContent">
+      <widget class="Gui::ExpressionLineEdit" name="cellContent">
        <property name="enabled">
         <bool>false</bool>
        </property>
@@ -46,6 +46,11 @@
    <extends>QTableView</extends>
    <header>SheetTableView.h</header>
   </customwidget>
+  <customwidget>
+   <class>Gui::ExpressionLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header location="global">Gui/ExpressionCompleter.h</header>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>cells</tabstop>

src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.cpp

@@ -22,14 +22,22 @@
  *                                                                         *
  ***************************************************************************/
 
-#include "SpreadsheetDelegate.h"
+#include "PreCompiled.h"
+#ifndef _PreComp_
 #include <QItemDelegate>
 #include <QLineEdit>
+#endif
+
+#include "SpreadsheetDelegate.h"
+#include <App/DocumentObject.h>
+#include <Mod/Spreadsheet/App/Sheet.h>
+#include <Gui/ExpressionCompleter.h>
 
 using namespace SpreadsheetGui;
 
-SpreadsheetDelegate::SpreadsheetDelegate(QWidget *parent) :
-    QItemDelegate(parent)
+SpreadsheetDelegate::SpreadsheetDelegate(Spreadsheet::Sheet * _sheet, QWidget *parent)
+    : QItemDelegate(parent)
+    , sheet(_sheet)
 {
 }
 
@@ -37,17 +45,23 @@ QWidget *SpreadsheetDelegate::createEditor(QWidget *parent,
                                           const QStyleOptionViewItem &,
                                           const QModelIndex &index) const
 {
-    QLineEdit *editor = new QLineEdit(parent);
+    Gui::ExpressionLineEdit *editor = new Gui::ExpressionLineEdit(parent);
 
+    editor->setDocumentObject(sheet);
     connect(editor, SIGNAL(returnPressed()), this, SLOT(commitAndCloseEditor()));
     return editor;
 }
 
 void SpreadsheetDelegate::commitAndCloseEditor()
 {
-    QLineEdit *editor = qobject_cast<QLineEdit *>(sender());
-    emit commitData(editor);
-    emit closeEditor(editor);
+    Gui::ExpressionLineEdit *editor = qobject_cast<Gui::ExpressionLineEdit *>(sender());
+    if (editor->completerActive()) {
+        editor->hideCompleter();
+        return;
+    }
+
+    Q_EMIT commitData(editor);
+    Q_EMIT closeEditor(editor);
 }
 
 void SpreadsheetDelegate::setEditorData(QWidget *editor,

src/Mod/Spreadsheet/Gui/SpreadsheetDelegate.h

@@ -27,13 +27,17 @@
 
 #include <QItemDelegate>
 
+namespace Spreadsheet {
+class Sheet;
+}
+
 namespace SpreadsheetGui {
 
 class SpreadsheetDelegate : public QItemDelegate
 {
     Q_OBJECT
 public:
-    explicit SpreadsheetDelegate(QWidget *parent = 0);
+    explicit SpreadsheetDelegate(Spreadsheet::Sheet * sheet, QWidget *parent = 0);
     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
                           const QModelIndex &index) const;
     void setEditorData(QWidget *editor, const QModelIndex &index) const;
@@ -43,7 +47,8 @@ public:
     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
 private Q_SLOTS:
     void commitAndCloseEditor();
-
+private:
+    Spreadsheet::Sheet * sheet;
 };
 
 }

src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp

@@ -43,6 +43,7 @@
 #include <Gui/MainWindow.h>
 #include <Gui/Application.h>
 #include <Gui/Document.h>
+#include <Gui/ExpressionCompleter.h>
 #include <App/DocumentObject.h>
 #include <App/PropertyStandard.h>
 #include <Gui/Command.h>
@@ -73,7 +74,7 @@ SheetView::SheetView(Gui::Document *pcDocument, App::DocumentObject *docObj, QWi
     ui->setupUi(w);
     setCentralWidget(w);
 
-    delegate = new SpreadsheetDelegate();
+    delegate = new SpreadsheetDelegate(sheet);
     ui->cells->setModel(model);
     ui->cells->setItemDelegate(delegate);
     ui->cells->setSheet(sheet);
@@ -110,6 +111,9 @@ SheetView::SheetView(Gui::Document *pcDocument, App::DocumentObject *docObj, QWi
     QList<QtColorPicker*> fgList = Gui::getMainWindow()->findChildren<QtColorPicker*>(QString::fromAscii("Spreadsheet_ForegroundColor"));
     if (fgList.size() > 0)
         fgList[0]->setCurrentColor(palette.color(QPalette::Text));
+
+    // Set document object to create auto completer
+    ui->cellContent->setDocumentObject(sheet);
 }
 
 SheetView::~SheetView()
@@ -195,6 +199,9 @@ void SheetView::updateContentLine()
             cell->getStringContent(str);
         ui->cellContent->setText(QString::fromUtf8(str.c_str()));
         ui->cellContent->setEnabled(true);
+
+        // Update completer model; for the time being, we do this by setting the document object of the input line.
+        ui->cellContent->setDocumentObject(sheet);
     }
 }
 
@@ -273,6 +280,11 @@ void SheetView::resizeRow(int col, int newSize)
 
 void SheetView::editingFinished()
 {
+    if (ui->cellContent->completerActive()) {
+        ui->cellContent->hideCompleter();
+        return;
+    }
+
     QModelIndex i = ui->cells->currentIndex();
 
     // Update data in cell