QQuickView：在C ++中处理鼠标事件 [英] QQuickView: handling mouse events in C++

问题描述

我在qml控件下使用QQuickView :: beforeRendering事件渲染我的3d模型。
如果用户点击任何qml控件之外，我想在C ++中执行我的鼠标事件处理/我如何在QQuickView :: mousePressEvent中发现鼠标在qml控件外按下？

<我认为使用自定义 QQuickItem 更容易做到这一点，因为使用自定义<$ c>

这里有一个例子：

$

b
$ b

  #include< QtQuick> 
 
 class MyItem：public QQuickItem 
 {
 public：
 MyItem（）{
 setAcceptedMouseButtons（Qt :: AllButtons）; 
} 
 
 void mousePressEvent（QMouseEvent * event）{
 QQuickItem :: mousePressEvent（event）; 
 qDebug（）<< event-> pos（）; 
} 
}; 
 
 int main（int argc，char ** argv）
 {
 QGuiApplication app（argc，argv）; 
 
 QQuickView * view = new QQuickView; 
 qmlRegisterType< MyItem>（Test，1,0，MyItem）; 
 view-> setSource（QUrl :: fromLocalFile（main.qml））; 
 view-> show（）; 
 
 return app.exec（）; 
} 
  

将自定义项目放在场景的底部，未处理的鼠标事件：

  import QtQuick 2.3 
 import QtQuick.Controls 1.0 
 import Test 1.0 
 
 Rectangle {
 width：400 
 height：400 
 visible：true 
 
 MyItem {
 anchors.fill：parent 
} 
 
按钮{
x：100 
y：100 
 text：Button
} 
} 
  




I render my 3d model under qml controls using QQuickView::beforeRendering event. I want to do my mouse events handling in C++ if user clicks outside any of qml controls/ How can I found out in QQuickView::mousePressEvent that mouse is pressed outside qml controls?

解决方案

I think it's easier to do it with a custom QQuickItem, because doing it with a custom QQuickView apparently means that you get the events before they reach any of the items.

Here's an example:

#include <QtQuick>

class MyItem : public QQuickItem
{
public:
    MyItem() {
        setAcceptedMouseButtons(Qt::AllButtons);
    }

    void mousePressEvent(QMouseEvent *event) {
        QQuickItem::mousePressEvent(event);
        qDebug() << event->pos();
    }
};

int main(int argc, char** argv)
{
    QGuiApplication app(argc, argv);

    QQuickView *view = new QQuickView;
    qmlRegisterType<MyItem>("Test", 1, 0, "MyItem");
    view->setSource(QUrl::fromLocalFile("main.qml"));
    view->show();

    return app.exec();
}

Put the custom item at the bottom of the scene and it will get all of the unhandled mouse events:

import QtQuick 2.3
import QtQuick.Controls 1.0
import Test 1.0

Rectangle {
    width: 400
    height: 400
    visible: true

    MyItem {
        anchors.fill: parent
    }

    Button {
        x: 100
        y: 100
        text: "Button"
    }
}

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