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Есть QGraphicsScene в которой происходит рисование на загруженной в нее картинке. Нужно дать пользователю возможность рисовать линию из точки А в точку В только при зажатой левой кнопке мыши. 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itemprop="accessMode" content="textual"><meta itemprop="dateCreated" content="May 5, 2017, 8:04 p.m."><meta itemprop="dateModified" content="Feb. 15, 2025, 1:46 p.m."><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><meta itemprop="keywords" content="QGraphicsScene"><div class="card mb-3"><div class="card-header d-flex py-2"><a href=/en/users/248/><img 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Нужно дать пользователю возможность рисовать линию из точки А в точку В только при зажатой левой кнопке мыши. Рисование линии должно быть похоже на рисование линии в Paint. Как можно это организовать в Qt.</p></div><div class="mt-3"><a href="https://timeweb.com/ru/?i=27415&utm_source=evileg&utm_medium=after_article&utm_campaign=base" rel="nofollow" target="_blank"><div class="d-flex"><div class="me-3"><img src="/media/technical_storage/timeweb-120-90.jpg" alt="We recommend hosting TIMEWEB"></div><div><h5 class="mt-0">We recommend hosting TIMEWEB</h5> Stable hosting, on which the social network EVILEG is located. 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</script></div><a class="anchor" id="comments"></a><div id="comments-feed"><div id="1424" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1424"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/2/"><span itemprop="name">Evgenii Legotckoi</span><link itemprop="url" href="/en/users/2/"></a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1424" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1424" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 5, 2017, 9:27 p.m.</small></li></ul></div></div><div id='post_content_1424' itemprop="text" class="card-body"><div class="mb-3"><p> У меня прямо урок есть по <a href="https://evileg.com/post/84/"> рисованию в Qt </a> . </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1426" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1426"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/248/><img loading="lazy" alt="Arrow" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/1c/28/1c28fd7eebc2cab904aa7c535f8169f6.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/248/"><span itemprop="name">Arrow</span><link itemprop="url" href="/en/users/248/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1424">Evgenii Legotckoi</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1426" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1426" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 5, 2017, 11:43 p.m.</small></li></ul></div></div><div id='post_content_1426' itemprop="text" class="card-body"><div class="mb-3"><p> Урок хороший, читал. </p><p> Вопрос в том что при ЛКМ запомнить начальную точку, при перемещении мыши отрисовать прямую линию из начальной точки в текущую позицию курсора, при отпускании ЛК мыши закончить рисование. </p><p> Но при зажатой ЛК мыши не должна рисоваться ломаная (сплошное рисование), а должна рисоваться прямая из нач. точки в новую точку, где теперь находится курсор. Старая же линия должна исчезнуть. </p><p> Вопрос: Как реализовать такое? Основное это как избавиться от старой линии. Просто зарисовать цветом фона не выйдет т. к. фон это изображение загруженное в QGraphicsScene (выбрано пользователем). </p><p> Это, что-то аналогичное функции MS Paint (Gimp, Pinta) - линия (прямая). </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1427" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1427"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/2/"><span itemprop="name">Evgenii Legotckoi</span><link itemprop="url" href="/en/users/2/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1426">Arrow</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1427" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1427" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 5, 2017, 11:47 p.m.</small></li></ul></div></div><div id='post_content_1427' itemprop="text" class="card-body"><div class="mb-3"><p> То есть суть в том, что мы нажимаем ЛКМ, на qgraphicsscene появляется линия, один конец которой находится в точке клика, а второй следует за курсором. Как отпускаем ЛКМ, тогда линия и фиксируется как нарисованная? Я правильно понял? </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1428" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1428"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/248/><img loading="lazy" alt="Arrow" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/1c/28/1c28fd7eebc2cab904aa7c535f8169f6.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/248/"><span itemprop="name">Arrow</span><link itemprop="url" href="/en/users/248/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1427">Evgenii Legotckoi</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1428" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1428" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 6, 2017, 12:13 a.m.</small></li></ul></div></div><div id='post_content_1428' itemprop="text" class="card-body"><div class="mb-3"><p> Да </p><p> Извините, случайно выбрал пост как решение. </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1429" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1429"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/2/"><span itemprop="name">Evgenii Legotckoi</span><link itemprop="url" href="/en/users/2/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1428">Arrow</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1429" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1429" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 6, 2017, 12:56 a.m.</small></li></ul></div></div><div id='post_content_1429' itemprop="text" class="card-body"><div class="mb-3"><p> Есть у меня кое-какой код, но его нужно ещё найти и выдернуть из проекта. Завтра накидаю пример. </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1430" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1430"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/248/><img loading="lazy" alt="Arrow" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/1c/28/1c28fd7eebc2cab904aa7c535f8169f6.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/248/"><span itemprop="name">Arrow</span><link itemprop="url" href="/en/users/248/"></a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1430" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1430" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 6, 2017, 1:14 a.m.</small></li></ul></div></div><div id='post_content_1430' itemprop="text" class="card-body"><div class="mb-3"><p> Я подумываю о записи линии с начальной точки в текущую в GroupItem, а затем при перемещении мыши удалении ее оттуда и рисовании новой с начальной точки в новую. </p><p> Только вопрос в том правильно ли это? Возможно есть вариант по лучше. </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1432" class="card mb-3" itemprop="suggestedAnswer acceptedAnswer" itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1432"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/2/"><span itemprop="name">Evgenii Legotckoi</span><link itemprop="url" href="/en/users/2/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1430">Arrow</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1432" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1432" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 6, 2017, 4:48 p.m.</small></li><li class="list-inline-item me-2"><small class="text-success">The answer was marked as a solution.</small></li></ul></div></div><div id='post_content_1432' itemprop="text" class="card-body"><div class="mb-3"><p> То есть получается, что объект линии будет постоянно пересоздаваться, так? Лучше будет не пересоздавать объект линии, а устанавливать его форму. При этом алгоритм такой: </p><ol><li> При нажатии ЛКМ запоминаем позицию в качестве начальной точки </li><li> Поднимаем флаг, что была зажата ЛКМ </li><li> Создаём объект линии, и сохраняем указатель на него </li><li> При перемещении переустанавливаем форму линии с помощью запомненной первой позиции и текущей позиции курсора. </li><li> При отпускании кнопки мыши сбрасываем флаг зажатия ЛКМ. </li></ol><p> В самом простом варианте это реализуется с помощью графической сцены. В более сложном варианте имеет смысл логику по формированию формы выносить в класс линии. Это если типов графических объектов будет достаточно много. Тогда им можно сделать один общий базовый класс с виртуальными методами, которые будут единым интерфейсом взаимодействия с графической сценой. А иначе сама графическая сцена по коду может сильно распухнуть. Но пока приведу пример с графической сценой. </p><b> workplace.h </b><pre class="prettyprint lang-cpp">#ifndef WORKPLACE_H #define WORKPLACE_H #include <QGraphicsScene> class QGraphicsSceneMouseEvent; class QKeyEvent; class WorkPlace : public QGraphicsScene { Q_OBJECT Q_PROPERTY(QPointF previousPosition READ previousPosition WRITE setPreviousPosition NOTIFY previousPositionChanged) public: explicit WorkPlace(QObject *parent = 0); ~WorkPlace(); QPointF previousPosition() const; void setPreviousPosition(const QPointF previousPosition); signals: void previousPositionChanged(); protected: void mousePressEvent(QGraphicsSceneMouseEvent *event) override; void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override; void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override; private: QGraphicsItem *currentItem; QPointF m_previousPosition; bool m_leftMouseButtonPressed; }; #endif // WORKPLACE_H</pre><b> workplace.cpp </b><pre class="prettyprint lang-cpp">#include "workplace.h" #include <QGraphicsSceneMouseEvent> #include <QGraphicsLineItem> WorkPlace::WorkPlace(QObject *parent) : QGraphicsScene(parent), currentItem(nullptr), m_leftMouseButtonPressed(false) { setSceneRect(0, 0, 500, 500); } WorkPlace::~WorkPlace() { delete currentItem; } QPointF WorkPlace::previousPosition() const { return m_previousPosition; } void WorkPlace::setPreviousPosition(const QPointF previousPosition) { if (m_previousPosition == previousPosition) return; m_previousPosition = previousPosition; emit previousPositionChanged(); } void WorkPlace::mousePressEvent(QGraphicsSceneMouseEvent *event) { if (event->button() & Qt::LeftButton) { m_leftMouseButtonPressed = true; setPreviousPosition(event->scenePos()); QGraphicsLineItem *line = new QGraphicsLineItem(); currentItem = line; addItem(currentItem); line->setLine(QLineF(m_previousPosition, m_previousPosition)); } } void WorkPlace::mouseMoveEvent(QGraphicsSceneMouseEvent *event) { if (m_leftMouseButtonPressed) { QGraphicsLineItem *line = qgraphicsitem_cast<QGraphicsLineItem *>(currentItem); line->setLine(QLineF(m_previousPosition, event->scenePos())); } } void WorkPlace::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) { if (event->button() & Qt::LeftButton) { m_leftMouseButtonPressed = false; } }</pre></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="1465" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-1465"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a href=/en/users/248/><img loading="lazy" alt="Arrow" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/1c/28/1c28fd7eebc2cab904aa7c535f8169f6.webp"></a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/248/"><span itemprop="name">Arrow</span><link itemprop="url" href="/en/users/248/"></a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-1465" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="1465" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">May 10, 2017, 3:47 p.m.</small></li></ul></div></div><div id='post_content_1465' itemprop="text" class="card-body"><div class="mb-3"><p> Спасибо! </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div><div id="9885" class="card mb-3" itemprop="suggestedAnswer " itemscope itemtype="http://schema.org/Answer"><a class="anchor" name="post-9885"></a><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/BookmarkAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/LikeAction"><meta itemprop="userInteractionCount" content="0"></div><div itemprop="interactionStatistic" itemscope itemtype="https://schema.org/InteractionCounter"><meta itemprop="interactionType" content="https://schema.org/DislikeAction"><meta itemprop="userInteractionCount" content="0"></div><div class="card-header d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18263/>f</a><div class="ms-3"><ul class="list-inline mb-0"><li class="list-inline-item"><a rel="author" itemprop="author" itemscope itemtype="http://schema.org/Person" href="/en/users/18263/"><span itemprop="name">firstlunoxod</span><link itemprop="url" href="/en/users/18263/"></a> → <a class="text-muted" href="/en/forum/topic/218/#post-1432">Evgenii Legotckoi</a></li><li class="list-inline-item mx-2"><a href="/en/forum/topic/218/#post-9885" title="Link to answer" itemprop="url">#</a></li></ul><ul data-post-header="9885" class="list-inline mb-0"><li class="list-inline-item me-2" itemprop="dateCreated"><small class="text-secondary">Feb. 15, 2025, 1:46 p.m.</small></li><li id='post_lastmod_9885' class="list-inline-item me-2" title="Feb. 15, 2025, 5:59 p.m."><small class="text-secondary">(edited)</small></li></ul></div></div><div id='post_content_9885' itemprop="text" class="card-body"><div class="mb-3"><p> Подскажите, пожалуйста! <br/> Как данный класс можно дополнить, чтобы созданные объекты можно было перемещать мышкой по сцене? </p></div><ul class="list-inline mb-0"></ul></div><div class="card-footer"><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can add to favorites"><i class="bi bi-bookmark me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-up-fill me-1"></i>0</div><div class="btn btn-sm btn-light" onclick="Global.nonlogin()" title="Only registered users can rate"><i class="bi bi-hand-thumbs-down-fill me-1"></i>0</div></div></div></div><div class="card card-warning m-3 "><div class="card-header bg-warning"><h3 class="card-title mb-0">Comments</h3></div><div class="card-body"> Only authorized users can post comments.<br/>Please, <a href="/en/accounts/login/">Log in</a> or <a href="/en/accounts/register/">Sign up</a></div></div></div></div><div class="col-12 col-lg-auto"><div class="sidebar sidebar-lg sticky-lg-top mb-3"><div class="list-group mb-3"><div class="list-group-item list-group-item-primary"><strong>Actions</strong></div><a None href="/en/knowledge/article/add/" class="list-group-item list-group-item-action"><span>Write article</span></a><a None href="/en/forum/create_topic/" class="list-group-item list-group-item-action"><span>Ask a question</span></a><a None href="/en/forum/create_topic/" class="list-group-item list-group-item-action"><span>Take the test</span></a><a None href="/en/sharecode/create/" class="list-group-item list-group-item-action"><span>Share code</span></a></div><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8160668332851230" crossorigin="anonymous"></script><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-8160668332851230" data-ad-slot="8743063287" data-ad-format="auto" data-full-width-responsive="true"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div></div></div><div class="row"><div class="col-12 col-lg overflow-hidden"><ul class="list-group mb-3"><li class="list-group-item list-group-item-primary"><strong>Last passed tests</strong></li><li class="list-group-item"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18277/>IS</a><div class="ms-3"><div><a href="/en/users/18277/" class="text-decoration-none">Ivan Simonenko</a></div><small class="text-secondary">March 31, 2025, 2:03 a.m.</small></div></div><div class="mb-3"><div><a href="/en/tests/t/9/">Qt - Test 001. Signals and slots</a></div><div><strong>Result:</strong> 0 points</div><div><span class="text-danger">Test is not passed</span></div></div></li><li class="list-group-item"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18456/>АА</a><div class="ms-3"><div><a href="/en/users/18456/" class="text-decoration-none">Антон Арнст</a></div><small class="text-secondary">March 14, 2025, 1:48 p.m.</small></div></div><div class="mb-3"><div><a href="/en/tests/t/9/">Qt - Test 001. Signals and slots</a></div><div><strong>Result:</strong> 68 points</div><div><span class="text-danger">Test is not passed</span></div></div></li><li class="list-group-item"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18456/>АА</a><div class="ms-3"><div><a href="/en/users/18456/" class="text-decoration-none">Антон Арнст</a></div><small class="text-secondary">March 14, 2025, 1:43 p.m.</small></div></div><div class="mb-3"><div><a href="/en/tests/t/1/">C++ - Test 001. The first program and data types</a></div><div><strong>Result:</strong> 60 points</div><div><span class="text-danger">Test is not passed</span></div></div></li></ul><ul class="list-group mb-3"><li class="list-group-item list-group-item-primary"><strong>Last comments</strong></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><div><a href="/en/users/2/" class="text-decoration-none">Evgenii Legotckoi</a></div><small class="text-secondary">March 9, 2025, 9:02 p.m.</small></div></div><div><a href="/en/post/193/#comment-2844">QML - Lesson 020. Introduction to Android Manifest in Qt Creator</a></div><div class="text-break"> К сожалению, я этого подсказать не могу, поскольку у меня нет необходимости в обходе блокировок и т.д. Поэтому я и не задавался решением этой проблемы. Ну выглядит так, что вам действитель…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/15549/>VP</a><div class="ms-3"><div><a href="/en/users/15549/" class="text-decoration-none">Viktor Pathfinder</a></div><small class="text-secondary">March 9, 2025, 4:14 p.m.</small></div></div><div><a href="/en/post/193/#comment-2843">QML - Lesson 020. Introduction to Android Manifest in Qt Creator</a></div><div class="text-break"> Здравствуйте! Я устанавливал Qt6 из исходников а также Qt Creator по отдельности. Все компоненты, связанные с разработкой для Android, установлены. Кроме одного... Когда пытаюсь скомпилиров…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/1217/>ИМ</a><div class="ms-3"><div><a href="/en/users/1217/" class="text-decoration-none">Игорь Максимов</a></div><small class="text-secondary">Nov. 22, 2024, 9:51 p.m.</small></div></div><div><a href="/en/post/203/#comment-2842">Django - Tutorial 017. Customize the login page to Django</a></div><div class="text-break"> Добрый вечер Евгений! Я сделал себе авторизацию аналогичную вашей, все работает, кроме возврата к предидущей странице. Редеректит всегда на главную, хотя в логах сервера вижу запросы на правильн…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a href=/en/users/2/><img loading="lazy" alt="Evgenii Legotckoi" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7a/08/7a0837c6eb199ca9af1a03ea5ccbfcbf.webp"></a><div class="ms-3"><div><a href="/en/users/2/" class="text-decoration-none">Evgenii Legotckoi</a></div><small class="text-secondary">Oct. 31, 2024, 11:37 p.m.</small></div></div><div><a href="/en/post/729/#comment-2751">Django - Lesson 064. How to write a Python Markdown extension</a></div><div class="text-break"> Добрый день. Да, можно. Либо через такие же плагины, либо с постобработкой через python библиотеку Beautiful Soup </div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/17869/>A</a><div class="ms-3"><div><a href="/en/users/17869/" class="text-decoration-none">ALO1ZE</a></div><small class="text-secondary">Oct. 19, 2024, 5:19 p.m.</small></div></div><div><a href="/en/post/485/#comment-2750">Fb3 file reader on Qt Creator</a></div><div class="text-break"> Подскажите как это запустить? Я не шарю в программировании и кодинге. Скачал и установаил Qt, но куча ошибок выдается и не запустить. А очень надо fb3 переконвертировать в html </div></div></li></ul><ul class="list-group mb-3"><li class="list-group-item list-group-item-primary"><strong>Now discuss on the forum</strong></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18263/>f</a><div class="ms-3"><div><a href="/en/users/18263/" class="text-decoration-none">firstlunoxod</a></div><small class="text-secondary">Feb. 15, 2025, 1:46 p.m.</small></div></div><div><a href="/en/forum/topic/218/#post-9885">Рисование на QGraphicsScene при зажатой кнопке мыши</a></div><div class="text-break"> Подскажите, пожалуйста! Как данный класс можно дополнить, чтобы созданные объекты можно было перемещать мышкой по сцене? </div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a href=/en/users/2417/><img loading="lazy" alt="Дмитрий" class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" src="/media/cache/7f/2a/7f2a7c6416eb74fb21e8506c0ed78532.webp"></a><div class="ms-3"><div><a href="/en/users/2417/" class="text-decoration-none">Дмитрий</a></div><small class="text-secondary">Feb. 3, 2025, 4:24 p.m.</small></div></div><div><a href="/en/forum/topic/1920/">Создание deb-пакета. Как создать ярлык на рабочем столе после установки собственного deb-пакета?</a></div><div class="text-break"> Всем привет. Сделал свой deb-пакет с программой. Всё устанавливается и работает. Ставлю по пути /usr/bin/my_application. Как для пользователя при установке пакета сразу создать ярлык на раб…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/18202/>NW</a><div class="ms-3"><div><a href="/en/users/18202/" class="text-decoration-none">Nayo Wai</a></div><small class="text-secondary">Jan. 30, 2025, 7:22 p.m.</small></div></div><div><a href="/en/forum/topic/1919/">не запускается компьютер!!!</a></div><div class="text-break"> Не запускается компьютер (точнее работает блок , но сам монитор вообще жесть)В общем я ничего с интернета не скачивала в последнее время. На компе никаких левых пр…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/12748/>n</a><div class="ms-3"><div><a href="/en/users/12748/" class="text-decoration-none">nkly</a></div><small class="text-secondary">Jan. 3, 2025, 12:52 p.m.</small></div></div><div><a href="/en/forum/topic/1909/#post-9884">Нужно запретить перемещение только некоторых итемов, остальные перемещать можно.</a></div><div class="text-break"> Вопрос решен. Узнать QModelIndex элемента на который мы перетаскиваем другой элемент, можно с помощью функции indexAt(event->position().toPoint()) представления QTreeViev вызываемой в переопр…</div></div></li><li class="list-group-item"><div class="py-2"><div class="d-flex py-2"><a class="bg-secondary bg-opacity-10 rounded avatar-initials avatar-48" href=/en/users/15590/>M</a><div class="ms-3"><div><a href="/en/users/15590/" class="text-decoration-none">Marsel</a></div><small class="text-secondary">Aug. 17, 2023, 12:26 a.m.</small></div></div><div><a href="/en/forum/topic/1850/#post-9711">OAuth2.0 через VK, получение email</a></div><div class="text-break"> Спасибо большое за помощь и простите за то что отнял время своей невнимательностью. </div></div></li></ul></div><div class="col-12 col-lg-auto"><div class="sidebar sidebar-lg sticky-lg-top mb-3"><div class="sidebar sidebar-lg sticky-top"><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8160668332851230" crossorigin="anonymous"></script><ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-8160668332851230" data-ad-slot="3079673067" data-ad-format="auto" data-full-width-responsive="true"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); 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