From 3c67147824b800167386bd3ee5168d6f27fee4ff Mon Sep 17 00:00:00 2001
From: Beat Hangartner <beat@hangartners.ch>
Date: Mon, 5 Oct 2026 17:59:28 +0200
Subject: [PATCH] Resize text fields in the element editor by dragging a corner

In the element editor, a dynamic text field that is the only selected
item gets the corner handles of TextResizeHandles: dragging one sets
the width the field wraps to, keeping the opposite corner in place;
double-clicking a handle goes back to the automatic width. One undo
step per drag, on the editor's undo stack.

ElementScene keeps the handles of the same text when the undo stack
changes: pushing the resize itself calls managePrimitivesGroups()
again, and deleting the handles there would delete them while they are
still emitting.

No file format change (text_width on <dynamic_text> already exists).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 sources/editor/elementscene.cpp | 44 +++++++++++++++++++++++++++++++++
 sources/editor/elementscene.h   |  3 +++
 2 files changed, 47 insertions(+)

diff --git a/sources/editor/elementscene.cpp b/sources/editor/elementscene.cpp
index a9b8d85d2..b08892cb0 100644
--- a/sources/editor/elementscene.cpp
+++ b/sources/editor/elementscene.cpp
@@ -23,6 +23,7 @@
 #include "../NameList/ui/namelistwidget.h"
 #include "../QPropertyUndoCommand/qpropertyundocommand.h"
 #include "../QetGraphicsItemModeler/qetgraphicshandleritem.h"
+#include "../QetGraphicsItemModeler/textresizehandles.h"
 #include "editorcommands.h"
 #include "elementcontent.h"
 #include "elementprimitivedecorator.h"
@@ -1498,9 +1499,52 @@ void ElementScene::managePrimitivesGroups()
 		m_decorator -> setPos(0, 0);
 		m_decorator -> setItems(selected_items);
 	}
+	manageTextResizeHandles(selected_items);
 	m_decorator_lock -> unlock();
 }
 
+/**
+	@brief ElementScene::manageTextResizeHandles
+	Show the corner handles that change the width of a text field when it
+	is the only selected item, and it is not being typed in.
+	Called again when the undo stack changes, including from the push of a
+	resize itself: the handles of the same text are then kept, not deleted
+	while they are still emitting.
+	@param selected_items
+*/
+void ElementScene::manageTextResizeHandles(const QList<QGraphicsItem *> &selected_items)
+{
+	QGraphicsTextItem *text = nullptr;
+	if (selected_items.size() == 1 &&
+		selected_items.first()->type() == PartDynamicTextField::Type)
+	{
+		text = static_cast<PartDynamicTextField *>(selected_items.first());
+	}
+	if (text && (text->textInteractionFlags() & Qt::TextEditable))
+		text = nullptr;
+
+	if (m_text_resize_handles && m_text_resize_handles->parentItem() == text) {
+		m_text_resize_handles->updateHandlesPos();
+		return;
+	}
+
+	if (m_text_resize_handles) {
+		m_text_resize_handles->hide();
+		m_text_resize_handles->deleteLater();
+		m_text_resize_handles.clear();
+	}
+
+	if (text)
+	{
+		m_text_resize_handles = new TextResizeHandles(text);
+		connect(m_text_resize_handles, &TextResizeHandles::resizeFinished, this,
+				[this, text](qreal old_width, qreal new_width, QPointF old_pos, QPointF new_pos)
+		{
+			m_undo_stack.push(new TextResizeCommand(text, old_width, new_width, old_pos, new_pos));
+		});
+	}
+}
+
 /**
 	@brief ElementScene::stackAction
 	Push the provided \a command on the undo stack.
diff --git a/sources/editor/elementscene.h b/sources/editor/elementscene.h
index ee275703f..5d3beb427 100644
--- a/sources/editor/elementscene.h
+++ b/sources/editor/elementscene.h
@@ -33,6 +33,7 @@ class QETElementEditor;
 class ESEventInterface;
 class QKeyEvent;
 class CustomElementGraphicPart;
+class TextResizeHandles;
 /**
 	@brief The ElementScene class
 	This class is the canvas allowing the visual edition of an electrical element.
@@ -90,6 +91,7 @@ class ElementScene : public QGraphicsScene
 		    m_y_grid;
 
 		QPointer<CustomElementGraphicPart> m_single_selected_item;
+		QPointer<TextResizeHandles> m_text_resize_handles;
 
 		bool m_hotspot_visible = true;
 		bool m_background_frame_visible = false;
@@ -180,6 +182,7 @@ class ElementScene : public QGraphicsScene
 		void slot_editAuthorInformations();
 		void slot_editProperties();
 		void managePrimitivesGroups();
+		void manageTextResizeHandles(const QList<QGraphicsItem *> &selected_items);
 		void stackAction(ElementEditionCommand *);
 	
 	signals: