QML 錯誤：無效的屬性名稱 minX (M16)

Question

我正在使用 Qt 5.12.8，我已經導入

import QtQml.Models 2.2 
import QtQuick 2.7 
import QtQuick.Controls 2.2 
import QtQuick.Layouts 1.3 

但我收到此錯誤：無效的屬性名稱 minX (M16)。 有人可以指導我我的錯誤是什么！

NewWindow {
    id: newWindow
    visible: !privateVars.isLoading && !privateVars.isEditing
    x: (maxX-minX)/2
    y: (maxY-minY)/2
    minX: -parent.x        //ERROR invalid property name minX (M16)
    maxX: monitor.width - width - parent.x - additionalToolbarRightMargin -25 //ERROR invalid property name maxX (M16)
    minY: -parent.y    //ERROR invalid property name minY (M16)
    maxY: monitor.height - height -parent.y  //ERROR invalid property name maxY (M16)
    onLoadClicked: privateVars.isLoading = true
    //selectedMissionInstance: loadMissionWindow.selectedMissionInstance
    onNewClicked:
    {
        //Create new mission in missionmodel and go to edit view
        missionPlanningModel.newMissionClicked()
        privateVars.isEditing = true
    }
}

Answer 1

我猜你想為 NewWindow 創建一個變量 minX/minY/etc，而不是為現有變量設置一個值。 如果是這樣，您應該聲明它。 像那樣：

NewWindow {
    id: newWindow
    visible: !privateVars.isLoading && !privateVars.isEditing
    x: (maxX-minX)/2
    y: (maxY-minY)/2
    property int minX: -parent.x     //Now it's not firing an error
    property int maxX: monitor.width - width - parent.x - additionalToolbarRightMargin -25 
    property int minY: -parent.y   
    property int maxY: monitor.height - height -parent.y maxY (M16)
    onLoadClicked: privateVars.isLoading = true
    //selectedMissionInstance: loadMissionWindow.selectedMissionInstance
    onNewClicked:
    {
        //Create new mission in missionmodel and go to edit view
        missionPlanningModel.newMissionClicked()
        privateVars.isEditing = true
    }
}