QML:在控制台中列出所有对象成员/属性



有没有办法列出QML&问题5.1?

例如:

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

这将对调试非常有帮助。

Straight javascript提供了您想要的东西:

JSON.stringify(anything)

它适用于矩形等QML项,也适用于大多数任意对象!

将对象转换为字符串

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

您需要一些C++来获取QML组件的元对象,并在QML中以文本形式返回属性名称和值。

首先用properties方法在C++中创建一个QMLDebugger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;
}

这个函数可以是静态的,也可以是可实例化的,没关系。QML无论如何都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);

现在将类导出到QML。在您的main.cpp中添加

#include "qmldebugger.h"

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

在QML文件中导入新库,创建QMLDebugger实例并开始愉快的调试:

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));
    }
}

完整的源代码可作为最低限度的Qt Creator项目提供:https://github.com/webmaster128/QMLDebugger

只需将QML/C++组件/对象转换为JavaScriptvar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QML文件中,只需调用

onClicked:
{
    listProperty(ItemID)
    //or with this to list self properties
    listProperty(this)
}

如果有人只想列出对象的属性,没有信号或插槽,你可以使用这个

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

如果您不仅对控制台调试感兴趣,KDAB有一个名为GammaRay的程序(链接),可以让您在基于QWidgets或QtQuick的程序运行时内省和更改所有属性。非常整洁!

我还没有看到迭代所有属性的解决方案。但这可能会帮助你迈出第一步。

对于每个快速项目,您可以打印出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.c基线:QVariant(QQuickAnchorLine),anchor.sbaselineOffset:0,anchor.bottom:QVariation(QQuick锚线),anchos.bottomMargin:0,"horizontalCenterOffset":0,"anchors.left":QVariant(QQuickAnchorLine),"anchos.leftMargin':0,"anchors.margins":0,"baselineOffset":14,"children":[object object],"childrenRect.height":0,名称':来源,"layer.ssmooth":false,"layer.sourceRect":QRectF(0,0,0),"layer.textureSize":QSize(-1,-1),"layer.wrapMode":0,"opacity":1,"parent":QQuickRectangle_QML_0(0x29857d0),visible’:true,"visibleChildren":[object object],"width":80.5625,"x":139.71875,"y":171,"z":0,}

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