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();
};
}
private void SetupBackButton()
{
var children = XamlUtilities.RecurseChildren(this);
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 child_buttons = children.OfType <Button>();
_togglePaneButton = child_buttons.Single(x => x.Name == "TogglePaneButton");
_togglePaneButton.RegisterPropertyChangedCallback(MarginProperty, (s, args) =>
{
if (_togglePaneButton.Margin.Top != 0)
{
_togglePaneButton.Margin = new Thickness(0, 0, 0, 32);
}
});
_togglePaneButton.Margin = new Thickness(0, 0, 0, 32);
_togglePaneButton.Focus(FocusState.Programmatic);
var parent_grid = _togglePaneButton.Parent as Grid;
parent_grid.Width = double.NaN;
parent_grid.ColumnDefinitions.Add(new ColumnDefinition {
Width = new GridLength(48)
});
parent_grid.ColumnDefinitions.Add(new ColumnDefinition {
});
parent_grid.RowDefinitions[0].Height = GridLength.Auto;
parent_grid.RowDefinitions[1].Height = GridLength.Auto;
_paneTitleTextBlock = new TextBlock
{
Name = "PaneTitleTextBlock",
Margin = new Thickness(8, 18, 0, 0),
FontSize = 15,
FontFamily = new FontFamily("Segoe UI Bold"),
TextWrapping = TextWrapping.NoWrap,
Foreground = Resources["SystemControlForegroundBaseHighBrush"] as Brush,
VerticalAlignment = VerticalAlignment.Top,
IsHitTestVisible = false,
Text = "Jerry Nixon",
};
_paneTitleTextBlock.SetValue(Grid.ColumnProperty, 1);
_paneTitleTextBlock.SetValue(Grid.RowProperty, 1);
_paneTitleTextBlock.SetValue(Canvas.ZIndexProperty, 100);
// parent_grid.Children.Add(_paneTitleTextBlock);
_backButton = new Button
{
Name = "BackButton",
Content = new SymbolIcon
{
Symbol = Symbol.Back,
IsHitTestVisible = false
},
Style = Resources["PaneToggleButtonStyle"] as Style,
};
_backButton.SetValue(Canvas.ZIndexProperty, 100);
parent_grid.Children.Insert(1, _backButton);
NavigationService.CanGoBackChanged += (s, args) =>
{
_backButton.IsEnabled = NavigationService.CanGoBack();
};
_backButton.Click += (s, args) =>
{
var gesture_service = GestureService.GetForCurrentView();
gesture_service.RaiseBackRequested();
};
}
private void UpdatePageHeaderContent()
{
_updatePageHeaderSemaphore.Wait();
try
{
if (_frame.Content is Page page)
{
if (page.GetValue(NavProperties.HeaderProperty) is string headerText && !Equals(Header, headerText))
{
Header = headerText;
}
if (!(page.GetValue(NavProperties.HeaderCommandsProperty) is ObservableCollection <object> headerCommands) || !(headerCommands.Any()))
{
localClearPageHeaderCommands();
}
else
{
localUpdatePageHeaderCommands(headerCommands);
}
}
}
finally
{
_updatePageHeaderSemaphore.Release();
}
#region local functions
void localClearPageHeaderCommands()
{
if (!localTryGetCommandBar(out var bar))
{
return;
}
bar.PrimaryCommands.Clear();
}
bool localTryGetCommandBar(out CommandBar bar)
{
var children = XamlUtilities.RecurseChildren(this);
var bars = children
.OfType <CommandBar>();
if (!bars.Any())
{
bar = default(CommandBar);
return(false);
}
bar = bars.First();
return(true);
}
void localUpdatePageHeaderCommands(ObservableCollection <object> headerCommands)
{
if (!localTryGetCommandBar(out var bar))
{
return;
}
var previous = bar.PrimaryCommands
.OfType <DependencyObject>()
.Where(x => x.GetValue(NavProperties.PageHeaderCommandDynamicItemProperty) is bool value && value);
foreach (var command in previous.OfType <ICommandBarElement>().ToArray())
{
bar.PrimaryCommands.Remove(command);
}
foreach (var command in headerCommands.Reverse().OfType <DependencyObject>().ToArray())
{
command.SetValue(NavProperties.PageHeaderCommandDynamicItemProperty, true);
bar.PrimaryCommands.Insert(0, command as ICommandBarElement);
}
}
#endregion
}
