private static void WireUpEnabledToCanExecute(ToolBarButton button, UIBarItem uiButton)
{
if (button.Command != null)
button.Command.CanExecuteChanged += (s, e) =>
uiButton.InvokeOnMainThread(() =>
{
var enabled = button.Command.CanExecute(button.CommandParameter);
if (uiButton.Enabled == enabled) return;
uiButton.Enabled = enabled;
if (uiButton.Image != null)
uiButton.Image = ImageHelper.AdjustOpacity(uiButton.Image, enabled ? 1 : 0.5f);
});
uiButton.Enabled = button.Command == null || button.Command.CanExecute(button.CommandParameter);
if (!uiButton.Enabled && uiButton.Image != null)
uiButton.Image = ImageHelper.AdjustOpacity(uiButton.Image, 0.5f);
}
private static void HandleButtonClick(ToolBarButton button)
{
if (button.Command != null && button.Command.CanExecute(button.CommandParameter))
button.Command.Execute(button.CommandParameter);
}
private void BuildControls()
{
BackgroundColor = Color.Black;
var grid = new Grid
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.Fill,
};
grid.AddAutoRowDefinition();
grid.AddStarRowDefinition();
grid.AddAutoRowDefinition();
grid.AddAutoRowDefinition();
grid.AddAutoRowDefinition();
grid.AddStarColumnDefinition();
var doneButton = new Button
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.End,
TextColor = Color.White,
Text = "Done"
};
doneButton.SetBinding(Button.CommandProperty, new Binding("CloseCommand"));
var doneButtonContentView = new ContentView
{
Padding = new Thickness(0, 0, 20, 0),
Content = doneButton
};
var image = new ExtendedImage
{
Aspect = Aspect.AspectFit
};
image.SetBinding(Image.SourceProperty, new Binding("ImageSource"));
var imageContentView = new ContentView
{
Padding = new Thickness(10, 0, 10, 0),
Content = image
};
var titleLabel = new ExtendedLabel
{
HorizontalOptions = LayoutOptions.Center,
TextColor = Color.White,
XAlign = TextAlignment.Center,
LineBreakMode = LineBreakMode.NoWrap,
AdjustFontSizeToFitWidth = true
};
titleLabel.SetBinding(Label.TextProperty, new Binding("ImageTitleText"));
var textLabel = new ExtendedLabel
{
HorizontalOptions = LayoutOptions.Center,
TextColor = Color.White,
XAlign = TextAlignment.Center,
LineBreakMode = LineBreakMode.WordWrap,
FontSize = Font.SystemFontOfSize(NamedSize.Small).FontSize
};
textLabel.SetBinding(Label.TextProperty, new Binding("ImageText"));
var toolBar = new ToolBar
{
Translucent = true,
BarStyle = BarStyle.Dark
};
toolBar.ToolBarButtons.Add(new ToolBarButton { SystemButtonItem = SystemButtonItem.FlexibleSpace });
var shareButton = new ToolBarButton
{
ImageSource = ImageSource.FromFile("Images/imageviewerpageupload.png")
};
shareButton.SetBinding(ToolBarButton.CommandProperty, "ShareImageCommand");
toolBar.ToolBarButtons.Add(shareButton);
Grid.SetRow(doneButtonContentView, 0);
Grid.SetRow(imageContentView, 1);
Grid.SetRow(titleLabel, 2);
Grid.SetRow(textLabel, 3);
Grid.SetRow(toolBar, 4);
grid.Children.Add(doneButtonContentView);
grid.Children.Add(imageContentView);
grid.Children.Add(titleLabel);
grid.Children.Add(textLabel);
grid.Children.Add(toolBar);
Content = grid;
}