如何在QGraphicsView中平移图像 [英] how to pan images in QGraphicsView

问题描述

我目前可以将我的图片加载到一个grahpics场景，然后再次进入一个QGraphicsViewer。

I am currently able to load my image into a grahpics scene, and then again into a QGraphicsViewer.

我能够实现缩放功能通过检测QEvent :: Wheel然后调用graphicsViews的scale（）函数。

I am able to implement a zoom feature by dtecting a QEvent::Wheel and then calling the graphicsViews's scale() function.

然而，我似乎无法弄清楚如何获取泛功能工作。我基本上想要在鼠标点击图片时检测，然后将图片与鼠标一起向左，向右，向上或向下移动。

However, I can't seem to figure out how to get the pan functionality working. I basically want to detect when a mouse has clicked down on the image, and then move the image left, right, up or down along with the mouse.

现在，我基本上有一个MouseFilter类，它检测事件，并根据事件类型做不同的事情。我将该监听器附加到QGraphicsView对象

As of right now, I basically have a MouseFilter class that is detecting events, and doing different things depending on the event type. I attached that listener to the QGraphicsView object

推荐答案

QGraphicsView具有内置鼠标平移支持。设置正确的 DragMode ，它会处理其余的。您需要启用滚动条才能工作。

QGraphicsView has build-in mouse-panning support. Set correct DragMode and it will handle the rest. You do need the enable scroll bars for that to work.

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