I am using Phone7.Fx R1
The following works. The system does not react when a user presses the button. This means, than there is no reaction if Stop Game is pressed without a game has been started and vice versa.
However the button looks active. I am aware that I can bind the IsEnabled to a different property, but I would like it to bind to NewGameCanExecute and StopGameCanExecute. Is this possible?
Some XAML code:
<Preview:BindableApplicationBarIconButton Command="{Binding NewGame}" IconUri="/images/icons/appbar.add.rest.png" Text="New game" />
<Preview:BindableApplicationBarIconButton Command="{Binding StopGame}" IconUri="/images/icons/appbar.stop.rest.png" Text="Stop game" />
And the relay commands:
public RelayCommand NewGame { get; private set; }
public RelayCommand StopGame { get; private set; }
//Constructor
NewGame = new RelayCommand(NewGameExecute, NewGameCanExecute);
StopGame = new RelayCommand(StopGameExecute, StopGameCanExecute);
void NewGameExecute()
{
_gameStarted = true;
_gameControlModel.StartNewGame();
StopGame.RaiseCanExecuteChanged();
}
bool NewGameCanExecute()
{
return !_gameStarted;
}
void StopGameExecute()
{
_gameControlModel.StopGame();
_gameStarted = false;
NewGame.RaiseCanExecuteChanged();
}
bool StopGameCanExecute()
{
return _gameStarted;
}
Couple of questions and answers:
Q: Have you tried to set a breakpoint in the CanExecute functions to see if it gets called?
A: Yes. It does get called, but the icon is not grayed out, eventhough false is returned. The Execute method is not executed, if the CanExecute method returns false. But I want the icon to be grayed out like a normal button.
SOLUTION
I spend some time and came up with a solution, which can be found here: http://pastebin.com/MM75xACj
SOLUTION
I spend some time and came up with a solution and edited the applicationbariconbutton class.