如何在QML中模拟鼠标点击？

Question

我正在尝试向QMouseEvent当前显示的QML对象发送一个.将QApplication::sendEvent()始终返回false这意味着我的事件没有得到处理; 但我不明白为什么.
也许我将事件发送到错误的对象？我应该把它寄到哪里？我也玩过QGraphicsSceneMouseEvent而不是QMouseEvent但也没有运气.

我尝试使用调试器逐步调试事件代码,但是对于我来说太复杂了,看不出它为什么不起作用.

背景

我正在开发一款可以通过简单的触摸屏控制的软件.我通过以太网获得触摸事件,我想从它们合成鼠标点击事件.这样,软件将以与开发者PC上相同的方式在目标设备上进行控制.

更新

1. 如fejd所述,点击代码之前已执行QApplication::Exec(),因此我将其移动到将在exec()运行时触发的计时器处理程序.
2. 添加了按预期工作的特定于Windows的代码.
3. 在Qt中添加了一些尝试,无论是sendEvent()返回true还是返回,都没有false.

到目前为止我有这个:

main.cpp中

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"

#include "clicksimulator.h"

#include <QTimer>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/qmlClickSimulator/main.qml"));
    viewer.showMaximized();

    ClickSimulator sim(&viewer);
    QTimer timer;
    sim.connect(&timer, SIGNAL(timeout()), SLOT(click()));
    timer.start(100);

    return app.exec();
}

clicksimulator.h

#ifndef CLICKSIMULATOR_H
#define CLICKSIMULATOR_H

#include <QObject>

class QmlApplicationViewer;

class ClickSimulator : public QObject
{
    Q_OBJECT
    QmlApplicationViewer* m_viewer;
public:
    explicit ClickSimulator(QmlApplicationViewer* viewer, QObject *parent = 0);

public slots:
    void click();    
};

#endif // CLICKSIMULATOR_H

clicksimulator.cpp

#include "clicksimulator.h"
#include "qmlapplicationviewer.h"

#include <QMouseEvent>
#include <QDebug>
#include <QGraphicsSceneMouseEvent>
#include <QApplication>
#include <QGraphicsScene>
#include <QTest>

#define _WIN32_WINNT 0x0501
#define WINVER 0x0501
#include "Windows.h"


ClickSimulator::ClickSimulator(QmlApplicationViewer* viewer, QObject *parent) :
QObject(parent)
, m_viewer(viewer)
{
}

void ClickSimulator::click()
{
    if (NULL != m_viewer)
    {
        const int x = qrand() % 500 + 100, y = qrand() % 500 + 100;

        {
           QMouseEvent pressEvent(QEvent::MouseButtonPress, QPoint(x, y), Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
//            QMouseEvent pressEvent(
//                QEvent::MouseButtonPress, 
//                QPoint(x, y),
//                Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
           const bool isSent = QApplication::sendEvent(m_viewer->scene(), &pressEvent);
           qDebug() << "'Press' at (" << x << "," << y << ") successful? " << isSent;
        }

        {
            QGraphicsSceneMouseEvent pressEvent(QEvent::GraphicsSceneMousePress);
            pressEvent.setScenePos(QPointF(x, y));
            pressEvent.setButton(Qt::LeftButton);
            pressEvent.setButtons(Qt::LeftButton);

            QGraphicsItem* item = m_viewer->itemAt(x, y);
            const bool isSent = m_viewer->scene()->sendEvent(item, &pressEvent);
            //const bool isSent = QApplication::sendEvent(m_viewer->scene(), &pressEvent);
            qDebug() << "'Press' at (" << x << "," << y << ") successful? " << isSent;
        }

        // This platform specific code works...
        {
            const double fScreenWidth = ::GetSystemMetrics( SM_CXSCREEN )-1; 
            const double fScreenHeight = ::GetSystemMetrics( SM_CYSCREEN )-1; 
            const double fx = x*(65535.0f/fScreenWidth);
            const double fy = y*(65535.0f/fScreenHeight);

            INPUT inp[3];
            inp[0].type = INPUT_MOUSE;

            MOUSEINPUT & mi = inp[0].mi;
            mi.dx = fx;
            mi.dy = fy;
            mi.mouseData = 0;
            mi.dwFlags = MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE;
            mi.time = 0;
            mi.dwExtraInfo = 0;

            inp[1] = inp[0];
            inp[1].mi.dwFlags = MOUSEEVENTF_LEFTDOWN;

            inp[2] = inp[0];
            inp[2].mi.dwFlags = MOUSEEVENTF_LEFTUP;

            SendInput(3, inp, sizeof(INPUT));
        }
    }
}

main.qml

import QtQuick 1.0

Rectangle {
    width: 360
    height: 360
    Text {
        id: text1
        text: qsTr("This text is placed at the click coordinates")
    }

    MouseArea {
        id: mousearea1
        anchors.fill: parent
        onClicked: {
        console.log("click at " + mouse.x + ", " + mouse.y);
            text1.pos.x = mouse.x;
            text1.pos.y = mouse.y;
        }
    }
}

产量

'Press' at ( 147 , 244 ) successful?  false 
'Press' at ( 147 , 244 ) successful?  true 

Answer 1

由于您在app.exec()之前发送事件,我不认为主事件循环已经启动.您可以尝试使用postEvent,但如果exec()在启动之前清除事件队列,则可能会失败.在那种情况下,也许你可以在exec()之后的某个地方发布它？

更新:通过查看QDeclarativeMouseArea自动测试,立即开始工作.缺少的是发布活动.这对我有用:

QGraphicsSceneMouseEvent pressEvent(QEvent::GraphicsSceneMousePress);
pressEvent.setScenePos(QPointF(x, y));
pressEvent.setButton(Qt::LeftButton);
pressEvent.setButtons(Qt::LeftButton);
QApplication::sendEvent(m_viewer->scene(), &pressEvent);

QGraphicsSceneMouseEvent releaseEvent(QEvent::GraphicsSceneMouseRelease);
releaseEvent.setScenePos(QPointF(x, y));
releaseEvent.setButton(Qt::LeftButton);
releaseEvent.setButtons(Qt::LeftButton);
QApplication::sendEvent(m_viewer->scene(), &releaseEvent);

有点奇怪的是,在新闻事件发生后,QML文件中的onPressed没有被调用 - 只有在发布事件发送之后.