mvvm - How to bind popup user control to view model and how to handle back button? (Windows Phone 8.1 Runtime) -


i'm working on wp 8.1 runtime application , i'm using caliburn.micro. application follows mvvm pattern. have itempageview , itempageviewmodel , data binding works should.

i want add popup (usercontrol) on itempageview(page) after click 1 item on itempage. popup has 1 scrollviewer containg 1 image , want :

<image x:name="imagefull"         source="{binding _currentitem.imageurl}"        horizontalalignment="center"         verticalalignment="center"/>

_currentitem property of itempageviewmodel.

my second problem related button. i've added code:

void hardwarebuttons_backpressed(object sender,  windows.phone.ui.input.backpressedeventargs e)     {         frame frame = window.current.content frame;          if (_popupactive)         {             _popupactive = false;             _showimagepopup.close();             frame.goforward();             //var lastpage = frame.backstack.lastordefault();             //frame.navigate(typeof(singleguideview));             e.handled = true;         }         else         {             frame.goback();             e.handled = true;         }     }

after click on button popup close, , after that, navigate back. "solution" stay on current view call frame.goforward(); .

about popup, can write code following in xaml (keep popup in below first grid):

<!-- first grid --> <grid>     <popup x:name="mypopup" width="400">         <scrollviewer>             <stackpanel>                 <image x:name="imagefull"                     source="{binding _currentitem.imageurl}"                    horizontalalignment="center"                     verticalalignment="center"/>             </stackpanel>         </scrollviewer>     </popup> </grid>

you can handle problem popup having counter hardware button press. have @ code below:

int _popupcounter = 0, _dummycounter = 0; void hardwarebuttons_backpressed(object sender,  windows.phone.ui.input.backpressedeventargs e) {     _dummycounter++;     frame frame = window.current.content frame;      if (_popupcounter == 0 && _dummycounter == 1)     {         _popupcounter = 1;         _popupactive = false;         _showimagepopup.close();         frame.goforward();         //var lastpage = frame.backstack.lastordefault();         //frame.navigate(typeof(singleguideview));         e.handled = true;     }     else if (_popupcounter == 1 && _dummycounter == 2)     {         _popupcounter = _dummycounter = 0;         frame.goback();         e.handled = true;     } }

this problem related popup.


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