Qt qgraphicsitem mousemoveevent 不响应
Web「这是我参与2024首次更文挑战的第14天,活动详情查看:2024首次更文挑战」。 上一章节介绍了关于QGraphicsView的基础讲解,以及简单的类图创建,由上一章节中最后展示的动画效果来看,今年主要讲述如何在QGraphicsView架构下,实时拖动鼠标绘制图形! WebApr 22, 2024 · Qt QGraphicsScene click, select, move, resize, delete QGraphicsItems - QGraphicsSceneTest.cpp
Qt qgraphicsitem mousemoveevent 不响应
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WebQGraphicsWidget *QGraphicsWidget:: focusWidget () const. If this widget, a child or descendant of this widget currently has input focus, this function will return a pointer to that widget. If no descendant widget has input focus, nullptr is returned. See also QGraphicsItem::focusItem () and QWidget::focusWidget (). WebJan 30, 2024 · Overview: Using Qt 5.9.2. Crash in QGraphicsScene::event, QGraphicsScene::mouseMoveEvent when using a hover event on one item to trigger …
WebQGraphicsItem is part of the \l {Graphics View Framework} 53: 54 \image graphicsview-items.png: 55: 56: For convenience, Qt provides a set of standard graphics items for the most: 57: common shapes. These are: 58: 59 \list: 60 \li QGraphicsEllipseItem provides an ellipse item: 61 \li QGraphicsLineItem provides a line item: 62 \li ... WebApr 9, 2024 · 一、下载qt从qt的下载站点选择合适的qt版本,这里选择qt5.10.1 下载好后双击开始安装 这里要你登陆qt账户,选择跳过 准备开始安装 选择qt的安装路径,路径中最好不要带有空格,这里选择默认路径 默认情况下至少要选择一个编译器组件,如果安装的有vs软件 …
WebMar 13, 2024 · qt鼠标移动到qgraphicsitem某区域改变鼠标形状代码怎么实现 查看. 首先, 你需要在你的 QGraphicsItem 子类中重写 `mouseMoveEvent()` 函数。在这个函数中, 你可以使用 `QCursor` 类来设置鼠标的形状。 具体实现方法如下: ``` void MyGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event ... WebNo there is no default way to do what you want as far as I know. Something you could do is the following: Subclass QGraphicsScene and implement the mouseMoveEvent; In the mouse move event check if there is an item at the event position using the itemAt function; If there is an item and it is selected (isSelected), get all selected items of the scene.For all …
WebApr 24, 2014 · Greetings. I'm implementing event handlers in a subclass of QGraphicsItem. Under certain circumstances (defined by a flag values ) I want that the cursor changes its shape (Qt::SizeVerCursor, Qt::SizeHorCursor, Qt::SizeBDiagCursor, Qt::SizeFDiagCursor and Qt::ArrowCursor) when being moved (without any mouse button being pressed) to certain …
WebJan 30, 2024 · Overview: Using Qt 5.9.2 Crash in QGraphicsScene::event, QGraphicsScene::mouseMoveEvent when using a hover event on one item to trigger removing a second item from the scene (removeItem), then deleting it later (deleteLater). Both items use SceneEventFilt... onn castWebMar 19, 2011 · QGraphicsRectItem无法触发 hoverEnterEvent ,改成继承自 QGraphicsItem 解决. 带有子图标的图形. 简介本文介绍了一个用Qt QGraphicsItem 作为基类实现的带有子图标的图形项,子图标可以独立响应鼠标悬浮 事件 和鼠标点击 事件 ,该方法可用于设计具有复杂UI响应的图标 ... onn cd radioWebNo there is no default way to do what you want as far as I know. Something you could do is the following: Subclass QGraphicsScene and implement the mouseMoveEvent; In the … in which english county is stonehengeWeb没有一个SSCCE来看待和测试用,很难肯定地说,但什么你描述听起来很像你mouseMoveEvent()回调才刚刚调用的时候,鼠标按钮在移动过程中被按住。 如果 鼠标按钮,而鼠标按下. 如果鼠标跟踪已关闭,鼠标移动事件只发生:那反过来,听起来很像的mouseMoveEvent(预期的行为),如记录在QWidget ... onn cd bluetooth boombox manualWeb在Qt Graphics item里mouse 的move和hover是不一样的。 hover是指鼠标经过,但是鼠标任何按键没有按下 move是指按下鼠标键后拖动,所以要先响应 mousePressEvent 返回 … in which eon are we currentlyWebJul 11, 2024 · 9 QGraphicsItem图元主要特性如下: 10 A、支持鼠标按下、移动、释放、双击、悬停、滚动和右键菜单事件。. 11 B、支持键盘输入焦点和按键事件 12 C、支持拖拽事件 13 D、支持分组,使用父子关系和QGraphicsItemGroup 14 E、支持碰撞检测 15 16 GraphicsView是一个基于图元的 ... in which eon did early life appearWebJun 7, 2024 · mousePressEvent()、mouseMoveEvent()、mouseReleaseEvent()和mouseDoubleClickEvent()处理鼠标按下、移动、释放、单击和双击事件。 可以通过安装事件筛选器来筛选任何其他项目的事件。此功能与Qt的常规事件筛选器(请参阅QObject::InstallEventFilter())不同,后者只在QObject的子类上工作。 onn cd clock radio ona13av502 manual