Add user-defined custom properties on elements

ElementInfoWidget's fixed ~40 predefined ELMT_* keys had no way for a
user to add a genuinely new element-info key, even though DiagramContext
already stores/round-trips arbitrary keys generically via toXml()/fromXml().

Adds an "Ajouter une propriété personnalisée" button that appends a
CustomElementInfoPartWidget row (both key and value user-editable,
unlike the fixed ElementInfoPartWidget rows bound to one predefined
key). The typed key is validated live against the existing
DiagramContext::isKeyAcceptable() and flagged with a red border when
it doesn't match, instead of silently dropping it. Any key already
present on the element that isn't one of the predefined/special keys
is re-displayed as a custom row on next selection.

Implements the scope proposed in discussion #611.

cmake/qet_compilation_vars.cmake

@@ -683,6 +683,8 @@ set(QET_SRC_FILES
   ${QET_DIR}/sources/ui/dynamicelementtextitemeditor.h
   ${QET_DIR}/sources/ui/dynamicelementtextmodel.cpp
   ${QET_DIR}/sources/ui/dynamicelementtextmodel.h
+  ${QET_DIR}/sources/ui/customelementinfopartwidget.cpp
+  ${QET_DIR}/sources/ui/customelementinfopartwidget.h
   ${QET_DIR}/sources/ui/elementinfopartwidget.cpp
   ${QET_DIR}/sources/ui/elementinfopartwidget.h
   ${QET_DIR}/sources/ui/elementinfowidget.cpp

sources/ui/customelementinfopartwidget.cpp

@@ -0,0 +1,113 @@
+/*
+	Copyright 2006-2026 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 "customelementinfopartwidget.h"
+
+#include "../diagramcontext.h"
+#include "../qeticons.h"
+
+#include <QGridLayout>
+#include <QLineEdit>
+#include <QToolButton>
+
+/**
+	@brief CustomElementInfoPartWidget::CustomElementInfoPartWidget
+	Constructor
+	@param key initial key name (empty for a freshly added row)
+	@param value initial value
+	@param parent parent widget
+*/
+CustomElementInfoPartWidget::CustomElementInfoPartWidget(
+		const QString &key,
+		const QString &value,
+		QWidget *parent) :
+	QWidget(parent),
+	m_key_edit(new QLineEdit(key, this)),
+	m_value_edit(new QLineEdit(value, this)),
+	m_remove_button(new QToolButton(this))
+{
+	m_key_edit->setPlaceholderText(tr("nom_de_la_propriete"));
+	m_key_edit->setToolTip(tr("Lettres minuscules, chiffres, tiret et underscore uniquement"));
+	m_value_edit->setClearButtonEnabled(true);
+
+	m_remove_button->setIcon(QET::Icons::Remove);
+	m_remove_button->setToolTip(tr("Supprimer cette propriété"));
+	m_remove_button->setAutoRaise(true);
+
+	auto *layout = new QGridLayout(this);
+	layout->setContentsMargins(0, 2, 0, 2);
+	layout->setVerticalSpacing(2);
+	layout->setHorizontalSpacing(0);
+	layout->addWidget(m_key_edit,   0, 0);
+	layout->addWidget(m_value_edit, 1, 0);
+	layout->addWidget(m_remove_button, 0, 1, 2, 1);
+
+	connect(m_key_edit, &QLineEdit::textChanged, this, &CustomElementInfoPartWidget::validateKey);
+	connect(m_key_edit, &QLineEdit::textChanged, this, &CustomElementInfoPartWidget::changed);
+	connect(m_value_edit, &QLineEdit::textChanged, this, &CustomElementInfoPartWidget::changed);
+	connect(m_remove_button, &QToolButton::clicked, this, [this]() {
+		emit removeRequested(this);
+	});
+
+	setFocusProxy(m_key_edit);
+	validateKey();
+}
+
+CustomElementInfoPartWidget::~CustomElementInfoPartWidget()
+{
+}
+
+/**
+	@return the key name currently typed in this row
+*/
+QString CustomElementInfoPartWidget::key() const
+{
+	return m_key_edit->text().trimmed();
+}
+
+/**
+	@return the value currently typed in this row
+*/
+QString CustomElementInfoPartWidget::value() const
+{
+	return m_value_edit->text();
+}
+
+/**
+	@return true if the typed key is non-empty and matches
+	DiagramContext::isKeyAcceptable()
+*/
+bool CustomElementInfoPartWidget::hasValidKey() const
+{
+	const QString k = key();
+	return !k.isEmpty() && DiagramContext::isKeyAcceptable(k);
+}
+
+/**
+	@brief CustomElementInfoPartWidget::validateKey
+	Flag the key field when it doesn't match the accepted format,
+	instead of silently dropping it later.
+*/
+void CustomElementInfoPartWidget::validateKey()
+{
+	const QString k = key();
+	if (k.isEmpty() || DiagramContext::isKeyAcceptable(k)) {
+		m_key_edit->setStyleSheet(QString());
+	} else {
+		m_key_edit->setStyleSheet(QStringLiteral("border: 1px solid red;"));
+	}
+}

sources/ui/customelementinfopartwidget.h

@@ -0,0 +1,61 @@
+/*
+	Copyright 2006-2026 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 CUSTOMELEMENTINFOPARTWIDGET_H
+#define CUSTOMELEMENTINFOPARTWIDGET_H
+
+#include <QWidget>
+
+class QLineEdit;
+class QToolButton;
+
+/**
+	@brief The CustomElementInfoPartWidget class
+	A single row letting the user define their own element information
+	key/value pair, unlike ElementInfoPartWidget which is bound to one
+	predefined key. The key is validated against
+	DiagramContext::isKeyAcceptable() as the user types.
+*/
+class CustomElementInfoPartWidget : public QWidget
+{
+		Q_OBJECT
+
+	public:
+		explicit CustomElementInfoPartWidget(
+				const QString &key = QString(),
+				const QString &value = QString(),
+				QWidget *parent = nullptr);
+		~CustomElementInfoPartWidget() override;
+
+		QString key() const;
+		QString value() const;
+		bool hasValidKey() const;
+
+	signals:
+		void changed();
+		void removeRequested(CustomElementInfoPartWidget *self);
+
+	private slots:
+		void validateKey();
+
+	private:
+		QLineEdit   *m_key_edit;
+		QLineEdit   *m_value_edit;
+		QToolButton *m_remove_button;
+};
+
+#endif // CUSTOMELEMENTINFOPARTWIDGET_H

sources/ui/elementinfowidget.cpp

@@ -17,12 +17,14 @@
 */
 #include "elementinfowidget.h"
 #include <QCheckBox>
+#include <QPushButton>
 #include "../diagram.h"
 #include "../qetapp.h"
 #include "../qetgraphicsitem/element.h"
 #include "../qetinformation.h"
 #include "../ui_elementinfowidget.h"
 #include "../undocommand/changeelementinformationcommand.h"
+#include "customelementinfopartwidget.h"
 #include "elementinfopartwidget.h"
 
 /**
@@ -47,6 +49,7 @@ ElementInfoWidget::ElementInfoWidget(Element *elmt, QWidget *parent) :
 ElementInfoWidget::~ElementInfoWidget()
 {
 	qDeleteAll(m_eipw_list);
+	qDeleteAll(m_custom_eipw_list);
 	delete ui;
 }
 
@@ -207,6 +210,11 @@ void ElementInfoWidget::buildInterface()
 		ui->scroll_vlayout->addWidget(eipw);
 		m_eipw_list << eipw;
 	}
+
+	m_add_custom_property_btn = new QPushButton(tr("Ajouter une propriété personnalisée"), this);
+	connect(m_add_custom_property_btn, &QPushButton::clicked, this, [this]() { addCustomProperty(); });
+	ui->scroll_vlayout->addWidget(m_add_custom_property_btn);
+
 	ui->scroll_vlayout->addStretch();
 
 	// Existing potential isolating checkbox
@@ -235,6 +243,67 @@ void ElementInfoWidget::buildInterface()
 		m_potential_isolating_cb->setVisible(false);
 	}
 }
+/**
+	@brief ElementInfoWidget::predefinedKeys
+	@return every key this widget already exposes a dedicated row for,
+	whether through ElementInfoPartWidget (the ~40 ELMT_* keys) or one
+	of the standalone checkboxes. Anything present in the element's
+	informations but absent from this list is a user-defined custom
+	property.
+*/
+QStringList ElementInfoWidget::predefinedKeys() const
+{
+	QStringList keys = (m_element.data()->elementData().m_type == ElementData::Terminal)
+			? QETInformation::terminalElementInfoKeys()
+			: QETInformation::elementInfoKeys();
+
+	keys << QStringLiteral("auto_num_locked")
+		 << QStringLiteral("potential_isolating")
+		 << QStringLiteral("exclude_from_bom");
+
+	return keys;
+}
+
+/**
+	@brief ElementInfoWidget::addCustomProperty
+	Append a new user-defined key/value row to the widget.
+	@param key initial key, left empty for a freshly added row
+	@param value initial value
+*/
+void ElementInfoWidget::addCustomProperty(const QString &key, const QString &value)
+{
+	auto *widget = new CustomElementInfoPartWidget(key, value, this);
+
+	const int insert_index = ui->scroll_vlayout->indexOf(m_add_custom_property_btn);
+	ui->scroll_vlayout->insertWidget(insert_index >= 0 ? insert_index : ui->scroll_vlayout->count(), widget);
+	m_custom_eipw_list << widget;
+
+	connect(widget, &CustomElementInfoPartWidget::removeRequested, this, &ElementInfoWidget::removeCustomProperty);
+	connect(widget, &CustomElementInfoPartWidget::changed, this, [this]() {
+		if (m_live_edit) apply();
+	});
+
+	if (key.isEmpty()) {
+		widget->setFocus();
+	}
+}
+
+/**
+	@brief ElementInfoWidget::removeCustomProperty
+	Remove a user-defined key/value row.
+	@param widget the row to remove
+*/
+void ElementInfoWidget::removeCustomProperty(CustomElementInfoPartWidget *widget)
+{
+	if (!m_custom_eipw_list.removeOne(widget))
+		return;
+
+	ui->scroll_vlayout->removeWidget(widget);
+	widget->deleteLater();
+
+	if (m_live_edit) apply();
+}
+
 /**
 	@brief ElementInfoWidget::infoPartWidgetForKey
 	@param key
@@ -271,6 +340,21 @@ void ElementInfoWidget::updateUi()
 	for (ElementInfoPartWidget *eipw : m_eipw_list) {
 		eipw -> setText (element_info[eipw->key()].toString());
 	}
+
+	// Rebuild the custom-property rows to match whatever
+	// user-defined keys this element currently carries.
+	while (!m_custom_eipw_list.isEmpty()) {
+		CustomElementInfoPartWidget *w = m_custom_eipw_list.takeLast();
+		ui->scroll_vlayout->removeWidget(w);
+		delete w;
+	}
+	const auto known_keys = predefinedKeys();
+	for (const QString &key : element_info.keys()) {
+		if (!known_keys.contains(key)) {
+			addCustomProperty(key, element_info[key].toString());
+		}
+	}
+
 	// Load the lock status for auto numbering
 	if (m_element->elementData().m_type == ElementData::Terminal) {
 		QString lock_value = element_info.value(QStringLiteral("auto_num_locked")).toString();
@@ -314,6 +398,17 @@ DiagramContext ElementInfoWidget::currentInfo() const
 		}
 	}
 
+	for (const auto &custom : std::as_const(m_custom_eipw_list))
+	{
+		if (custom->hasValidKey() && !custom->value().isEmpty())
+		{
+			QString txt{custom->value()};
+			txt.remove(QStringLiteral("\r"));
+			txt.remove(QStringLiteral("\n"));
+			info_.addValue(custom->key(), txt);
+		}
+	}
+
 	// Save the auto numbering lock status
 	if (m_element->elementData().m_type == ElementData::Terminal) {
 		info_.addValue(QStringLiteral("auto_num_locked"), ui->m_auto_num_locked_cb->isChecked() ? QStringLiteral("true") : QStringLiteral("false"));

sources/ui/elementinfowidget.h

@@ -26,8 +26,10 @@
 class Element;
 class QUndoCommand;
 class ElementInfoPartWidget;
+class CustomElementInfoPartWidget;
 class ChangeElementInformationCommand;
 class QCheckBox;
+class QPushButton;
 
 namespace Ui {
 	class ElementInfoWidget;
@@ -63,15 +65,20 @@ class ElementInfoWidget : public AbstractElementPropertiesEditorWidget
 	private:
 		void buildInterface();
 		ElementInfoPartWidget *infoPartWidgetForKey(const QString &key) const;
+		QStringList predefinedKeys() const;
 
 	private slots:
 		void firstActivated();
 		void elementInfoChange();
+		void addCustomProperty(const QString &key = QString(), const QString &value = QString());
+		void removeCustomProperty(CustomElementInfoPartWidget *widget);
 
 		//ATTRIBUTES
 	private:
 		Ui::ElementInfoWidget           *ui;
 		QList <ElementInfoPartWidget *>  m_eipw_list;
+		QList <CustomElementInfoPartWidget *> m_custom_eipw_list;
+		QPushButton                     *m_add_custom_property_btn = nullptr;
 		QCheckBox                       *m_potential_isolating_cb = nullptr;
 		QCheckBox                        *m_exclude_from_bom_cb = nullptr;
 		bool m_first_activation;