QGraphicsView:禁用自动滚动 [英] QGraphicsView: Disable automatic scrolling

问题描述

我想要一个从不自动滚动的 QGraphicsView.

I want to have a QGraphicsView that never scrolls automatically.

类似:基本上，我的问题与 http://developer.qt.nokia 相同.com/forums/viewthread/2220 ，但该线程没有收到答复.

Similar: Basically, my question is identical to http://developer.qt.nokia.com/forums/viewthread/2220 , but that thread didn't receive an answer.

到目前为止我尝试过的:

What I have tried so far:

• 在 showEvent() 和 resizeEvent() 中，我执行 ui->graphicsView->fitInView(...)，只要项目不超过屏幕矩形，它就可以正常工作
• 我也尝试过操纵视图变换，但除了缩放之外，它的系数永远不会改变，所以这也是徒劳的
• 禁用滚动条外观也无济于事

另见http://doc.qt.io/qt-4.8/qgraphicsview.html.

推荐答案

我找到了一个解决方案(不要犹豫发布您的替代方案 :) )，但我仍然认为这个答案可能会有所帮助，因为我在 google 和文档上苦苦挣扎大约 15 小时.

I found a solution (don't hesitate to post your alternatives :) ), still I thought this answer might be helpful as I struggled on google and documentations for like 15 hours.

关键不仅要调用fitInView()，还要调用setSceneRect().这是为我做的(用你自己的类名替换 FooBar):

The key is to not only call fitInView(), but also setSceneRect(). This did it for me (replace FooBar with your own class name):

void FooBar::resizeEvent(QResizeEvent *) {
        fitView();
}

void FooBar::showEvent(QShowEvent *) {
        fitView();
}

void FooBar::fitView() {
        const QRectF rect = QRectF(-0.5,-0.5, 1, 1);
        ui->graphicsView->fitInView(rect,
                                    Qt::KeepAspectRatio);
        ui->graphicsView->setSceneRect(rect);
}

这篇关于QGraphicsView:禁用自动滚动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！