qml - 如何从listview bb10 qml中的listitemcomponents访问外部组件？

Question

我无法从 ListItemComponent 内部访问数据源 ID。任何人都可以在这方面帮助我吗？

ListItemComponent {
    type: "item"
    Container {
        id: listviewcontainer
        Container {
            preferredWidth: 768
            layout: StackLayout {
                orientation: LayoutOrientation.LeftToRight
            }
            CustomImageView {
                leftPadding: 10
                rightPadding: 10
                url: ListItemData.from_image
                horizontalAlignment: HorizontalAlignment.Left
                verticalAlignment: VerticalAlignment.Center
            }
            Container {
                preferredWidth: 538
                layout: StackLayout {
                    orientation: LayoutOrientation.TopToBottom
                }
                Container {
                    layout: StackLayout {
                        orientation: LayoutOrientation.LeftToRight
                    }
                    Label {
                        text: ListItemData.from
                        textStyle {
                            base: SystemDefaults.TextStyles.TitleText
                            color: Color.create("#2db6ff")
                        }
                    }
                    ImageView {
                        imageSource: "asset:///Home/img.png"
                        verticalAlignment: VerticalAlignment.Center
                    }
                }//Container
                Label {
                    text: ListItemData.message
                    multiline: true
                    textStyle {
                        base: SystemDefaults.TextStyles.SubtitleText
                    }
                    content {
                        flags: TextContentFlag.Emoticons
                    }
                }
                Label {
                    id: time
                    text: ListItemData.time
                    textStyle {
                        base: SystemDefaults.TextStyles.SmallText
                        color: Color.create("#666666")
                    }
                }
            }//Container
            ImageButton {
                id: delete_btn
                defaultImageSource: "asset:///Icon/delete.png"
                pressedImageSource: "asset:///Icon/delete.png"
                verticalAlignment: VerticalAlignment.Center
                horizontalAlignment: HorizontalAlignment.Right
                onClicked: {
                    deleteMessage(ListItemData.tid, ListItemData.uid);
                }
                function deleteMessage(tid, uid) {
                    var request = new XMLHttpRequest()
                    request.onreadystatechange = function() {
                        if (request.readyState == 4) {
                            var mResponse = request.responseText
                            mResponse = JSON.parse(mResponse)
                            var mResponseStatus = mResponse.response[0].receive.status;
                            var mMsg = mResponse.response[0].receive.message;
                            if (mResponseStatus == 1) {
                                msg_DataSource.source = "newurl.com" //   This line not works here..
                                msg_DataSource.load();              //   This line not works here..
                            } else if (mResponseStatus == 0) {
                            }
                        }
                    }// end function
                    request.open("GET", "myurl.com", true);
                    request.send();
                }// deleteMessage
            }//ImageButton
        }//Container
    }//Container
}//ListItemComponent

这里无法计算出以下两行

msg_DataSource.source = "newurl.com" 
msg_DataSource.load();  

我试过如下，但还是不行

listviewcontainer.ListItem.view.dataModel.message_DataSource.source = "myurl.com";
listviewcontainer.ListItem.view.dataModel.message_DataSource.load();

或者这个

listviewcontainer.ListItem.view.dataModel.source = "myurl.com"; 
listviewcontainer.ListItem.view.dataModel.load();

Answer 1

使用以下代码将对象存储到全局变量的另一种最简单的方法对我来说效果很好。

         onCreationCompleted: {
         Qt.tabbedPane = tabbedPane;
         Qt.homeTab = homeTab;
        }   

在这里，我在页面创建完成时将 tabbedPane 存储在全局变量 Qt.tabbedPane 中。现在我可以使用 Qt.tabbedPane 从 ListItemComponent 访问它。

希望对您有所帮助。