QML:列出控制台中的所有对象成员/属性

时间:2013-11-29 21:53:14

标签: qt qml qt5 qtquick2

有没有办法在QML&中列出所有对象成员/属性? Qt 5.1?

如:

var obj=myQObject;
console.log(obj)
// expected output:
// obj { x:123..... }

这对调试非常有帮助。

6 个答案:

答案 0 :(得分:18)

直接的javascript提供您所需的内容:

JSON.stringify(anything)

它适用于QML项目,例如Rectangle,它也适用于大多数任意对象!

Converting an object to a string

答案 1 :(得分:11)

使用元对象,您可以调试任何QML obj的所有属性(即QQuickItem)。

您需要一些C ++来获取QML组件的元对象,并在QML中将属性名称和值作为文本返回。

首先使用QMLDebugger方法在C ++中创建properties类:

QString QMLDebugger::properties(QQuickItem *item, bool linebreak)
{
    const QMetaObject *meta = item->metaObject();

    QHash<QString, QVariant> list;
    for (int i = 0; i < meta->propertyCount(); i++)
    {
        QMetaProperty property = meta->property(i);
        const char* name = property.name();
        QVariant value = item->property(name);
        list[name] = value;
    }

    QString out;
    QHashIterator<QString, QVariant> i(list);
    while (i.hasNext()) {
        i.next();
        if (!out.isEmpty())
        {
            out += ", ";
            if (linebreak) out += "\n";
        }
        out.append(i.key());
        out.append(": ");
        out.append(i.value().toString());
    }
    return out;
}

此功能可以是静态的或可实现的,无关紧要。 QML不支持将静态方法从C ++导出到QML。我使用标题:

public:
    Q_INVOKABLE static QString properties(QQuickItem *item, bool linebreak = true);

现在将类导出为QML。在你main.cpp添加

#include "qmldebugger.h"

qmlRegisterType<QMLDebugger>("MyDemoLibrary", 1, 0, "QMLDebugger");

在你的QML文件中导入你的新库,创建一个QMLDebugger实例并开始快乐的调试:

import QtQuick 2.0
import MyDemoLibrary 1.0

Rectangle {
    id: mainRectangle
    width: 360
    height: 360
    color: "silver"

    Text {
        id: textElement
        color: "#d71f1f"
        text: qsTr("Hello World")
        font.bold: true
        font.italic: true
        font.underline: true
        style: Text.Raised
        horizontalAlignment: Text.AlignHCenter
        font.pointSize: 16
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.right: parent.right
    }

    QMLDebugger {
        id: qmlDebugger
    }

    Component.onCompleted: {
        console.log("Debug mainRectangle:");
        console.log(qmlDebugger.properties(mainRectangle));
        console.log("Debug textElement:");
        console.log(qmlDebugger.properties(textElement, false));
    }
}

完整源代码可在https://github.com/webmaster128/QMLDebugger

上作为最小Qt Creator项目使用

答案 2 :(得分:8)

只需将QML / C ++组件/对象转换为JavaScript var对象,并使用for-each语法列出所有属性:

function listProperty(item)
{
    for (var p in item)
    console.log(p + ": " + item[p]);
}

在您的QML文件中,只需调用

即可
onClicked:
{
    listProperty(ItemID)

    //or with this to list self properties
    listProperty(this)
}

答案 3 :(得分:2)

如果任何人想要仅列出对象的属性,没有信号或插槽,则可以使用此

function listProperty(item)
{
    for (var p in item)
    {
        if( typeof item[p] != "function" )
            if(p != "objectName")
                console.log(p + ":" + item[p]);
    }

}

答案 4 :(得分:1)

如果您不仅对控制台调试感兴趣,KDAB(link)有一个名为GammaRay的程序,它允许您在QWidgets或基于QtQuick的程序的运行时期间内省并更改所有属性。非常整洁!

答案 5 :(得分:0)

我没有看到迭代所有属性的解决方案。但也许这可以帮助你迈出第一步。

对于每个Quick Item,您都可以打印Item的属性:

import QtQuick 2.0

Rectangle {
    width: 360
    height: 360

    function debugQuickItem(object) {
        var properties = {
            'activeFocus': object.activeFocus,
            'activeFocusOnTab': object.activeFocusOnTab,
            'anchors.alignWhenCentered': object.anchors.alignWhenCentered,
            'anchors.baseline': object.anchors.baseline,
            'anchors.baselineOffset': object.anchors.baselineOffset,
            'anchors.bottom': object.anchors.bottom,
            'anchors.bottomMargin': object.anchors.bottomMargin,
            'anchors.centerIn': object.anchors.centerIn,
            'anchors.fill': object.anchors.fill,
            'anchors.horizontalCenter': object.anchors.horizontalCenter,
            'anchors.horizontalCenterOffset': object.anchors.horizontalCenterOffset,
            'anchors.left': object.anchors.left,
            'anchors.leftMargin': object.anchors.leftMargin,
            'anchors.margins': object.anchors.margins,
            'anchors.right': object.anchors.right,
            'anchors.rightMargin': object.anchors.rightMargin,
            'anchors.top': object.anchors.top,
            'anchors.topMargin': object.anchors.topMargin,
            'anchors.verticalCenter': object.anchors.verticalCenter,
            'anchors.verticalCenterOffset': object.anchors.verticalCenterOffset,
            'antialiasing': object.antialiasing,
            'baselineOffset': object.baselineOffset,
            'children': object.children,
            'childrenRect.height': object.childrenRect.height,
            'childrenRect.width': object.childrenRect.width,
            'childrenRect.x': object.childrenRect.x,
            'childrenRect.y': object.childrenRect.y,
            'clip': object.clip,
            'data': object.data,
            'enabled': object.enabled,
            'focus': object.focus,
            'height': object.height,
            'implicitHeight': object.implicitHeight,
            'implicitWidth': object.implicitWidth,
            'layer.effect': object.layer.effect,
            'layer.enabled': object.layer.enabled,
            'layer.format': object.layer.format,
            'layer.mipmap': object.layer.mipmap,
            'layer.samplerName': object.layer.samplerName,
            'layer.smooth': object.layer.smooth,
            'layer.sourceRect': object.layer.sourceRect,
            'layer.textureSize': object.layer.textureSize,
            'layer.wrapMode': object.layer.wrapMode,
            'opacity': object.opacity,
            'parent': object.parent,
            'resources': object.resources,
            'rotation': object.rotation,
            'scale': object.scale,
            'smooth': object.smooth,
            'state': object.state,
            'states': object.states,
            'transform': object.transform,
            'transformOrigin': object.transformOrigin,
            'transitions': object.transitions,
            'visible': object.visible,
            'visibleChildren': object.visibleChildren,
            'width': object.width,
            'x': object.x,
            'y': object.y,
            'z': object.z,
        }
        var out = "{ "
        for (var key in properties)
        {
            out += "'" + key + "': " + properties[key] + ", "
        }
        out += "}"
        return out;
    }

    Text {
        id: textObject
        anchors.centerIn: parent
        text: "Hello World"
    }

    Component.onCompleted: console.log(debugQuickItem(textObject));
}

输出:

  

{'activeFocus':false,'activeFocusOnTab':false,'anchors.alignWhenCentered':true,'anchors.baseline':QVariant(QQuickAnchorLine),'anchors.baselineOffset':0,'anchors.bottom':QVariant (QQuickAnchorLine),'anchors.bottomMargin':0,'anchors.centerIn':QQuickRectangle_QML_0(0x29857d0),'anchors.fill':null,'anchors.horizo​​ntalCenter':QVariant(QQuickAnchorLine),'anchors.horizo​​ntalCenterOffset':0, 'anchors.left':QVariant(QQuickAnchorLine),'anchors.leftMargin':0,'anchors.margins':0,'anchors.right':QVariant(QQuickAnchorLine),'anchors.rightMargin':0,'anchors.top ':QVariant(QQuickAnchorLine),'anchors.topMargin':0,'anchors.verticalCenter':QVariant(QQuickAnchorLine),'anchors.verticalCenterOffset':0,'antialiasing':false,'baselineOffset':14,'children': [object Object],'childrenRect.height':0,'childrenRect.width':0,'childrenRect.x':0,'childrenRect.y':0,'clip':false,'data':[object Object ],'启用':true,'focus':false,'height':17,'implicitHeight':17 ,'implicitWidth':80.5625,'layer.effect':null,'layer.enabled':false,'layer.format':6408,'layer.mipmap':false,'layer.samplerName':source,'layer。 smooth':false,'layer.sourceRect':QRectF(0,0,0,0),'layer.textureSize':QSize(-1,-1),'layer.wrapMode':0,'opacity':1 ,'parent':QQuickRectangle_QML_0(0x29857d0),'resources':[object Object],'rotation':0,'scale':1,'smooth':true,'state':,'states':[object Object] ,'transform':[object Object],'transformOrigin':4,'transitions':[object Object],'visible':true,'visibleChildren':[object Object],'width':80.5625,'x': 139.71875,'y':171,'z':0,}