private void SetupBackButton()
{
var children = XamlUtilities.RecurseChildren(ShellView);
var grids = children.OfType <Grid>();
var grid = grids.Single(x => x.Name == "TogglePaneTopPadding");
grid.Visibility = Visibility.Collapsed;
grid = grids.Single(x => x.Name == "ContentPaneTopPadding");
grid.RegisterPropertyChangedCallback(HeightProperty, (s, args) =>
{
if (grid.Height != 44d)
{
grid.Height = 44d;
}
});
grid.Height = 44d;
var buttons = children.OfType <Button>();
var button = buttons.Single(x => x.Name == "TogglePaneButton");
button.RegisterPropertyChangedCallback(MarginProperty, (s, args) =>
{
if (button.Margin.Top != 0)
{
button.Margin = new Thickness(0, 0, 0, 32);
}
});
button.Margin = new Thickness(0, 0, 0, 32);
button.Focus(FocusState.Programmatic);
var parent = button.Parent as Grid;
var backButton = new Button
{
Name = "BackButton",
Content = new SymbolIcon
{
Symbol = Symbol.Back,
IsHitTestVisible = false
},
Style = Resources["PaneToggleButtonStyle"] as Style,
};
parent.Children.Insert(1, backButton);
ShellView.NavigationService.CanGoBackChanged += (s, args) =>
{
backButton.IsEnabled = ShellView.NavigationService.CanGoBack();
};
backButton.Click += (s, args) =>
{
_gestureService.RaiseBackRequested();
};
}
