A scene drops the event filters of an item that leaves it. The handles
installed theirs once, in the constructor, and only if the text was in
a scene: after the text was removed and added back (undoing a delete
does that), or when the handles were made before the text was in a
scene, they no longer reacted, and a drag moved the text instead.
TextResizeHandles now installs the filters again whenever it enters a
scene.
Tests: dragAfterLeavingTheScene, dragWhenCreatedOutsideAScene (both
fail before).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
TextResizeHandles puts four handles at the corners of a selected text
(any QGraphicsTextItem with a qreal "textWidth" property, -1 = automatic
width). Dragging one changes the width: the opposite corner stays in
place in scene coordinates, for any rotation and rotation point, the
text wraps and the height follows it. Vertical mouse movements are
ignored, the width never goes below the longest word and is rounded to
whole pixels, and a click without a move changes nothing.
Double-clicking a handle goes back to the automatic width.
The handles are a child of the text, so they follow it when it moves,
rotates or is zoomed (as for the symbol text handles, #1002). The width
is changed live; the owner makes it undoable with TextResizeCommand,
which sets the width then the position on both undo and redo -- a text
may move itself when its width changes, so two property commands would
restore them in the wrong order.
The geometry is header-only (textresize.h). Nothing uses the handles
yet: the follow-up changes add them to free texts and to text fields in
the element editor.
Test: tst_textresizehandles, on a plain QGraphicsTextItem.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Beat Hangartner