Invocation from function in QML?

问题

I can share an item easily using an InvokeActionItem in a Page but I need to be able to call it in a listview item. I've managed to trigger an invoke, but I cannot figure out how to add data when triggering it. I keep getting an error message of

InvocationPrivate::setQuery: you are not allowed to change InvokeQuery object

Note: I am trying to do this in purely QML, I will do it via c++ if necessary but QML would be preferable.

Code that works inside a Page object:

actions: [
    InvokeActionItem {
        ActionBar.placement: ActionBarPlacement.OnBar
        title: "Share"   
        query {
            mimeType: "text/plain"
            invokeActionId: "bb.action.SHARE"
        }

        onTriggered: {
            //myTextProperty is a string variable property for the page.
            data = myTextProperty;                
        }
    }
]

The code I've tried to use in the other item is as follows, but does NOT work:

Container {
gestureHandlers: [
    TapHandler {
    LongPressHandler {
        onLongPressed: {
            console.log("Longpress");                

            invokeQuery.setData("test");

            invokeShare.trigger("bb.action.SHARE");
        }            
    }        

]

attachedObjects: [
    Invocation {
       id: invokeShare
       query: InvokeQuery {
           id:invokeQuery
           mimeType: "text/plain"         
       }   
    }
]
}

Is there a way to change the data for an invoke purely with QML or do I need to just run it through c++ instead?

回答1:

After a fair amount of browsing forums and testing various methods, I have finally found one that works.

Add the following in your attachedObjects:

attachedObjects: [      
    Invocation {
       id: invokeShare
       query: InvokeQuery {
           id:invokeQuery
           mimeType: "text/plain"                        
       }
       onArmed: {
           if (invokeQuery.data != "") {
               trigger("bb.action.SHARE");
           }
       }             
    }
]

Then wherever you need to call the invocation do the following:

invokeQuery.mimeType = "text/plain"
invokeQuery.data = "mytext";
invokeQuery.updateQuery();

Note that if you do not do a check in the onArmed for data it will automatically call the invocation on creation - in the case of a listview this can result in 20+ screens asking you to share on bbm... ;)

回答2:

You can actually use the InvokeActionItem, you just have to call updateQuery to retrigger the invokeQuery. When the ListItemData changes, the binding will cause the values to update.

InvokeActionItem {
      enabled: recordItem.ListItem.data.videoId != undefined

      id: invokeAction
      query{ 
            uri: "http://www.youtube.com/watch?v=" + recordItem.ListItem.data.videoId
            onQueryChanged: {
                  updateQuery()
            }
      }

}

回答3:

For remove "InvocationPrivate::setQuery: you are not allowed to change InvokeQuery object" message I use this:

attachedObjects: [      
    Invocation {
        id: invoke
        query {
            mimeType: "text/plain"
            invokeTargetId: "sys.bbm.sharehandler"
            onDataChanged: {
                console.log("change data")
            }                   
        }
        onArmed: {
            if (invoke.query.data != "") {
                invoke.trigger("bb.action.SHARE");
            }
        } 
    }
]

function shareBBM(){
    invoke.query.setData("TEXT TO SHARE");
    invoke.query.updateQuery();
}

来源：https://stackoverflow.com/questions/14341606/invocation-from-function-in-qml

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qml

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