Moving Object in ScrollViewer

问题

I'm using the MVVM setup, for my app and I'm using an scrollViewer to scroll around an map. On this map I have an unit which I'd like to move around when I select it. However when I select the unit my ScrollViewer is still activated, is there an way to work around the scrollViewer or deactivate it such that I can move the unit around. I already tried changing the ManipulationModeProperty to Control, but thius makes the unit lag when I move it around.

My ScrollViewer is:

 <ScrollViewer Width="768" Height="380" HorizontalScrollBarVisibility="Hidden">
        <View:Map/>
 </ScrollViewer>

The unit where I apply the manipulation is:

 public void ManStart(ManipulationStartedEventArgs e)
    {

        myScrollViewer.SetValue(ScrollViewer.ManipulationModeProperty, ManipulationMode.Control);

    public void ManDelta(ManipulationDeltaEventArgs e)
    {

        Point fingerPosition = e.DeltaManipulation.Translation;

        Unit.x = fingerPosition.X + ChampModelSel.x;
        Unit.y = fingerPosition.Y + ChampModelSel.y;

    }

public void ManCompleted(ManipulationCompletedEventArgs e)
    {

        var myScrollViewer = FindParentOfType<ScrollViewer>(ChampViewModel) as        ScrollViewer;
        myScrollViewer.SetValue(ScrollViewer.ManipulationModeProperty, ManipulationMode.System);

    }

回答1:

I ended up finding a solution for the problem myself. Because I set the ManipulationMode to control, I guess I disable some propertys which end up giving an lag when you move your object. So I ended up trying to make a storyboard when ever I move my object, which fixed the problem and gives me a nice smooth motion when I select the object I wish to move. What I did was I went into my ManDelta:

 public void ManDelta(ManipulationDeltaEventArgs e)
{

    Point fingerPosition = e.DeltaManipulation.Translation;

    Unit.x = fingerPosition.X + ChampModelSel.x;
    Unit.y = fingerPosition.Y + ChampModelSel.y;

}

and added some storyboard from the code behind, using this http://www.buzzfrog.se/index.php/2013/06/create-storyboards-in-code-for-windows-phone/ as a guide line. The ManDelta occurs every time I select the object and activate the ManipulationDelta

回答2:

Does the Unit have a property of Zindex? If yes, set Zindex of Scrollviewer and try setting the Unit ZIndex to a higher value than Scrollviewer.

回答3:

How about something like creating a global Map variable lets say named MyMap.

When you navigate to a page that contains your map and do (App.Curren as App).MyMap = //your map on the page.

When you do MouseDown and it is being triggered in "when I select the unit" you block all moving allowances of the map in

(App.Current as App).MyMap.IsScrollable = false; //or something like that.

So that map couldn't scroll when your "UNIT" is in MouseDown state and only "UNIT" was movable. And on MouseUp in "UNIT" undo the:

(App.Current as App).MyMap.IsScrollable = true;

来源：https://stackoverflow.com/questions/20213406/moving-object-in-scrollviewer

标签

wpf

windows-phone-8

scrollviewer