I'm trying to update the title of a view (ie : the text displayed in the tab) programmatically.
When i do that :
view.setPartName(newTitle);
The view name is well updated but the UI is not. So how can i do that ?
Thank you in advance!
You need to make sure you are setting partName in the correct init method and that you make a call to super before setting part name like this. I know this example works pasted from my app.
#Override
public void init(IViewSite site) throws PartInitException {
super.init(site);
String scannerName = site.getSecondaryId();
setPartName("MyName");
}
I'm updating a view's title without a problem ... when are you invoking the setPartName method?
In my class, which extends ViewPart, I'm invoking the setPartName method in the init method.
Related
I have a checkbox with a valueChangeHandler on it. It works when user check the checkbox.
For some reason, I need to set a value to this checkbox in my code, like this :
checkbox.setValue(true), the checkbox is perfectly checked visually but my problem is that it doesn't fire my valueChangeHandler.
checkBox.setValue(true);
checkBox.addValueChangeHandler(new ValueChangeHandler<Boolean>() {
#Override
public void onValueChange(ValueChangeEvent<Boolean> event) {
...
}
});
Is there another handler that can be fire when I set a value ? Or another way to dot this?
Thanks
EDIT : I also tried checkbox.setValue(true,true) but it doesn't work.
RESOLVED : the setValue MUST BE after the registration of the handler. Thanks
That's the difference between setValue(Boolean) vs. setValue(Boolean,boolean)
checkBox.setValue(true, true);
I am using the excellent Mvvmcross and Ninja Coder for Mvvmcross for building a cross platform app. For my windows store app I have created a view and a view model using Ninja coder. I have also created a UserControl which will be referenced in the view. Hence I need to bind the same viewmodel to the User control also. I have been trying to set the Data context of the user control to the singleton instance of viewmodel. I have set the data context of the user control like below.
public sealed partial class SearchResultsGridViewControl : UserControl
{
private SearchresultsViewModel _viewModel;
public SearchResultsGridViewControl()
{
this.InitializeComponent();
_viewModel = Mvx.IocConstruct<SearchresultsViewModel>();
this.DataContext = _viewModel;
}
}
But when I refer this User Control in my main view, it throws an error in XAML saying "Object Reference not set to an instance of an object. Cannot create an instance of SearchResultsGridViewControl".
This is my viewmodel:
public class SearchresultsViewModel : BaseViewModel
{
private ISearchResultsService _searchResultsService;
public SearchresultsViewModel(ISearchResultsService searchResultsService)
{
_searchResultsService = searchResultsService;
var items = _searchResultsService.DisplaySearchResults();
SchoolDetails = new ObservableCollection<School>(items);
}
private ObservableCollection<School> _schoolDetails;
public ObservableCollection<School> SchoolDetails
{
get { return _schoolDetails; }
set
{
_schoolDetails = value;
RaisePropertyChanged(() => SchoolDetails);
}
}
public ICommand RefineCommand
{
get
{
refineCommand = refineCommand ?? new MvxCommand(FilterSearchResultsBasedOnRefine);
return refineCommand;
}
}
public void FilterSearchResultsBasedOnRefine()
{
SchoolDetails = new ObservableCollection<School>(_searchResultsService.FilterSchoolsBasedOnRefine(MidDayMeals, PlayGround, DigitalClassroom, DayBoarding, TransportationFacility));
}
}
The grid view in my usercontrol is getting populated when it loads for the first time. But when RefineCommand is called to update the collection from the main view, the grid view in usercontrol is not getting updated. And I am guessing its because of that error earlier in setting the data context of the user control to view model. Please let me know what could be going wrong. I have been banging my head about it for days.
I've been using MVVMCross with Windows Store fairly recently. Without looking back at my code, I'm pretty sure that the Datacontext will inherit from it's parent unless overridden.
So as long as the MvxPage that you have presented has a viewmodel, any user control that you add to it, either in XAML or in code-behind, should share the same data context. If you are looking at doing some MVVMCross data-binding from the User Control, you should probably make sure your User Control implements IMvxStoreView, and ensure that the ViewModel property is set to the value of DataContext.
Hope that help.
Cheers,
Tristan
I think your first problem "Object Reference not set to an instance of an object" is a design time only issue - because you are trying to set the viewmodel using Mvx. at design time. You can workaround this issue if you want to by using design time viewmodels and possibly also by using one of the design time helpers (see https://github.com/MvvmCross/MvvmCross/blob/v3.1/CrossCore/Cirrious.CrossCore.Wpf/Platform/MvxDesignTimeHelper.cs).
I've no idea what your second problem is "The grid view in my usercontrol is getting populated when it loads for the first time. But when RefineCommand is called to update the collection from the main view, the grid view in usercontrol is not getting updated" - this sounds like an issue either in your xaml or in the results returned from FilterSearchResultsBasedOnRefine. From the current level of detail, I can't see what it is. My "gut feeling" is that the problem won't be MvvmCross specific - it'll just be a general Mvvm/data-binding issue.
I have added some extra functionality to the standard GWT ListBox by extending it like so:
public class FeatureListBox extends ListBox
{
public FeatureListBox()
{
}
public FeatureListBox(boolean isMultipleSelect)
{
super(isMultipleSelect);
}
public FeatureListBox(Element element)
{
super(element);
}
}
Nothing fancy here. However, the Change event is not firing now, or at least the handler (attached per below) is not getting invoked.
FeatureListBox listBox = new FeatureListBox();
listBox.addChangeHandler(new ChangeHandler()
{
public void onChange(ChangeEvent event)
{
// Do something here...
}
});
Any ideas why?
Either remove the no-argument constructor from FeatureListBox or call super() inside it, otherwise the initialization in the superclasses won't happen, which would probably result in what you're seeing.
The problem was in the way I was using my custom list box. In my application I wrap GWT Widgets around existing DOM elements on the page using the static wrap() methods of their widget classes in which the widgets get marked as attached, making them fire events. I didn't do that with my custom list box class originally, so I ended up implementing a static wrap() method similar to the one of the regular ListBox widget and using it in my code. Everything works like a charm now.
I would like to display all possible values in a SuggestBox.
Naturally, I have the following code (settingName is a SuggestBox)
settingName.getTextBox().addFocusHandler(new FocusHandler() {
#Override
public void onFocus(FocusEvent event) {
settingName.showSuggestionList();
}
});
Unfortunately, the suggestbox displays anything. Of course, the settingName is associated to an oracle with several values inside it.
Am I crazy ?
According to the documentation :
public void showSuggestionList()
Show the current list of suggestions.
You need to set the defaults to show by suggestOracle.setDefaultSuggestionsFromText(..)
When showing the list, the SuggestBox will ask the oracle for values to show. If the text box is empty, then requestDefaultSuggestions will be called (which by default calls requestSuggestions).
I am creating an RCP application. I need to open multiple instances of the same view but with different data. I did it by setting secondary id for different instances of the same view. Specifically, my problem is as follows: Please take a look
I have a graph view called Views.GraphView. I opened different instances of it from a command called openGraphView to show different graphs. The command is as follows:
page.showView("Views.GraphView", Integer.toString(instanceNum++), IWorkbenchPage.VIEW_ACTIVATE);
Now, I have a command called TreeLayout on this Views.GraphView toolbar, which suppose to change the layout of the graph and it will operate on each instance of the view. But for this, I think, I need to identify which instance of the view is active. The TreeLayout command looks something like this:
IViewPart findView = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage(). findView( "Views.GraphView"); //I think in the findView I need to give the id of the view [but how can I put the secondary id?]
GraphView view = (GraphView) findView;
view.changeLayout(); //I wrote this method in the graph view to change the layout
//I just tried to print the secondary id, but it did not print anyting
System.out.println("From treelayout command:- " + view.getViewSite().getSecondaryId());
So how can I identify which instance of the view is currently active and to operate on it?
You can use IWorkBenchPage.findViewReference(String viewId, String viewId) , if it returns null, the view with viewId and viewId is not present in the current perspective.
If you have a ViewReference you can use ViewReference.getView(boolean restore) to get the view
so in your handler you get something like:
final IWorkbenchPage page = HandlerUtil.getActiveWorkbenchWindow(
event).getActivePage();
final int instanceNum = 8;//the number of instances that are created
for (int index = 0; index < instanceNum; index++) {
final IViewReference viewReference = page.findViewReference(
"Views.GraphView", Integer.toString(index));
if (viewReference != null) {
final IViewPart view = viewReference.getView(true);
if (view instanceof GraphView) {
final GraphView graphView = (GraphView) view;
graphView.changeLayout();
}
}
}
The view.getViewSite().getSecondaryId() method is the good one to identify a secondary view. This method only returns the Null string for the "primary" view: the one opened when user click Window -> Show View - Your View.
I don't understand why your view toolbar button has to operate on all the view instances. TO my eyes, you should have one button in each view instance toolbar operating only in its own view. If you really need to operate from one button to ALL the views I think you will have to keep the open views references yourself, because I think the workbench doesn't provide a findViews method returning a view array.
using the below code you should be able to get the current active view.
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart()
Active view and Editor name display on MessageDialogbox
public class Active_Workbench extends AbstractHandler{
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
// A part service tracks the creation and activation of parts within a workbench page.
IPartService service = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getPartService();
MessageDialog.openInformation(HandlerUtil.getActiveWorkbenchWindow(
event).getShell(), "Current Workbench Window", service.getActivePart().getTitle().toString());
return null;
}
}
I hope this answer is useful.