Add toolbar widget for edit size of handler in diagram editor.

Add a combo box in the tool bar of diagram editor
to quickly change the size of the graphics handler item.

The sarto commit :D

NOTE
only available for diagram editor, element editor will
come later.

sources/ui/diagrameditorhandlersizewidget.cpp

@@ -0,0 +1,73 @@
+/*
+	Copyright 2006-2021 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 "diagrameditorhandlersizewidget.h"
+#include "ui_diagrameditorhandlersizewidget.h"
+#include "../qetapp.h"
+#include "../qetdiagrameditor.h"
+#include "../projectview.h"
+#include "../diagramview.h"
+#include "../diagram.h"
+#include "../../QetGraphicsItemModeler/qetgraphicshandleritem.h"
+
+DiagramEditorHandlerSizeWidget::DiagramEditorHandlerSizeWidget(QWidget *parent) :
+	QWidget(parent),
+	ui(new Ui::DiagramEditorHandlerSizeWidget)
+{
+	ui->setupUi(this);
+
+	if (auto editor = QETApp::instance()->diagramEditorAncestorOf(this))
+	{
+		const auto size =  editor->property("graphics_handler_size").toInt();
+
+		if (size == 10 || size < 10)
+			ui->comboBox->setCurrentIndex(0);
+		else if (size == 20)
+			ui->comboBox->setCurrentIndex(1);
+		else if (size == 30 || size > 30)
+			ui->comboBox->setCurrentIndex(2);
+	}
+}
+
+DiagramEditorHandlerSizeWidget::~DiagramEditorHandlerSizeWidget()
+{
+	delete ui;
+}
+
+void DiagramEditorHandlerSizeWidget::on_comboBox_currentIndexChanged(int index)
+{
+	if (auto editor_ = QETApp::instance()->diagramEditorAncestorOf(this))
+	{
+		editor_->setProperty("graphics_handler_size", (index+1) * 10);
+		if (auto project_view = editor_->currentProjectView()) {
+			if (auto diagram_view = project_view->currentDiagram()) {
+				if (auto diagram = diagram_view->diagram())
+				{
+					for (const auto item : diagram->items())
+					{
+						if (item->type() == QetGraphicsHandlerItem::Type)
+						{
+							auto handler = qgraphicsitem_cast<QetGraphicsHandlerItem *>(item);
+							handler->setSize((index+1) * 10);
+						}
+					}
+				}
+			}
+		}
+	}
+}
+

sources/ui/diagrameditorhandlersizewidget.h

@@ -0,0 +1,49 @@
+/*
+	Copyright 2006-2021 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/>.
+*/
+#ifndef DIAGRAMEDITORHANDLERSIZEWIDGET_H
+#define DIAGRAMEDITORHANDLERSIZEWIDGET_H
+
+#include <QWidget>
+
+namespace Ui {
+	class DiagramEditorHandlerSizeWidget;
+}
+
+/**
+ * @brief The DiagramEditorHandlerSizeWidget class
+ * A little widget with a combo box to edit the size of
+ * the graphics handler item in a QetDiagramEditor.
+ * Just create a new instance of this widget, everything
+ * is done by the widget itself.
+ */
+class DiagramEditorHandlerSizeWidget : public QWidget
+{
+		Q_OBJECT
+
+	public:
+		explicit DiagramEditorHandlerSizeWidget(QWidget *parent = nullptr);
+		~DiagramEditorHandlerSizeWidget();
+
+	private slots:
+		void on_comboBox_currentIndexChanged(int index);
+
+	private:
+		Ui::DiagramEditorHandlerSizeWidget *ui;
+};
+
+#endif // DIAGRAMEDITORHANDLERSIZEWIDGET_H

sources/ui/diagrameditorhandlersizewidget.ui

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>DiagramEditorHandlerSizeWidget</class>
+ <widget class="QWidget" name="DiagramEditorHandlerSizeWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>471</width>
+    <height>62</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Poignées :</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QComboBox" name="comboBox">
+     <item>
+      <property name="text">
+       <string>x 1</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>x 2</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>x 3</string>
+      </property>
+     </item>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>