element master widget property: improve gui.

add slave element class.
element class: replace diagramcontext informations by elementInformations because informations is already used in xml file for element.
minor improvement.


git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@2869 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/qetgraphicsitem/slaveelement.cpp

@@ -0,0 +1,81 @@
+/*
+	Copyright 2006-2014 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "slaveelement.h"
+
+/**
+ * @brief SlaveElement::SlaveElement
+ * Default constructor
+ * @param location location of xml definition
+ * @param qgi parent QGraphicItem
+ * @param s parent diagram
+ * @param state int used to know if the creation of element have error
+ */
+SlaveElement::SlaveElement(const ElementsLocation &location, QGraphicsItem *qgi, Diagram *s, int *state) :
+	CustomElement(location, qgi, s, state)
+{
+	link_type_ = Slave;
+}
+
+/**
+ * @brief SlaveElement::~SlaveElement
+ * default destructor
+ */
+SlaveElement::~SlaveElement() {
+	unlinkAllElements();
+}
+
+/**
+ * @brief SlaveElement::linkToElement
+ * Link this slave to another element
+ * For this class element must be a master
+ * @param elmt
+ */
+void SlaveElement::linkToElement(Element *elmt) {
+	// check if element is master and if isn't already linked
+	if (elmt->linkType() == Master && !connected_elements.contains(elmt)) {
+		if(!isFree()) unlinkAllElements();
+		connected_elements << elmt;
+		elmt->linkToElement(this);
+	}
+}
+
+/**
+ * @brief SlaveElement::unlinkAllElements
+ * Unlink all of the element in the QList connected_elements
+ */
+void SlaveElement::unlinkAllElements() {
+	// if this element is free no need to do something
+	if (!isFree()) {
+		foreach(Element *elmt, connected_elements) {
+			unlinkElement(elmt);
+		}
+	}
+}
+
+/**
+ * @brief SlaveElement::unlinkElement
+ * Unlink the given elmt in parametre
+ * @param elmt
+ */
+void SlaveElement::unlinkElement(Element *elmt) {
+	//Ensure elmt is linked to this element
+	if (connected_elements.contains(elmt)) {
+		connected_elements.removeOne(elmt);
+		elmt->unlinkElement(this);
+	}
+}