具有1列的Qt QML tableview不会占据整个宽度

Question

我在组件目录中有一个Table.qml文件，其内容为：

import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

TableView {

    anchors.fill: parent
    columnSpacing: 1
    rowSpacing: 1
    clip: true
    delegate: Rectangle {
        implicitWidth: 180
        implicitHeight: 70
        border.color: "black"
        color: (heading==true)?"#dddddd":"white"
        Text {
            text: tabledata
            anchors.centerIn: parent
        }
    }
}

这在另一个QML文件中使用，例如：

import QtQuick 2.0
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12
import "../../components" as Components

Rectangle {
  id: storeroomScanIncoming
  objectName: "ScanIncoming"
  color: "white"

  property string pageTitle: "Add Incoming Stock"
  property string backText: "Storeroom home"

  ColumnLayout {
    id: home
    anchors.leftMargin: parent.width * 0.1
    anchors.rightMargin: parent.width * 0.1
    anchors.fill: parent
    anchors.horizontalCenter: parent.horizontalCenter

    Components.PageTitle {
        title: pageTitle
    }

    Text {
      text: "Detected Items"
      font.pointSize: 10
      color: "#B70020"
      horizontalAlignment: Text.AlignLeft
      Layout.fillWidth: true
    }

    Rectangle {
      color: "transparent"
      Layout.fillWidth: true
      Layout.preferredHeight: parent.height * 0.6
      border.color: "#504338"
      border.width: 1

      Components.Table {
          model: _scannedItemTableModelAPI
      }
    }

    RowLayout {

      Item {
        //spacer Item {
        Layout.fillWidth: true
        Rectangle {
            anchors.fill: parent
            color: "transparent"
        }
      }

      Components.TransparentButton {
          text: "Confirm"
          onClicked: {
              stackView.push("ScanIncomingSummary.qml")
          }
      }

      Components.TransparentButton {
          text: "Rescan"
          onClicked: {
              ScanManager.startScan()
              timer.start()
          }

      }
    }

    Item {
        //spacer Item {
        Layout.fillWidth: true
        Layout.fillHeight: true
        Rectangle {
            anchors.fill:  parent
            color: "white"
        }
    }
  }
}

使用的_scannedItemTableModelAPI模型包含一个QtStringList。它只有1列数据。但是，当我运行该应用程序时，单列并没有占据TableView所在的Rectangle的整个宽度。