void UpdateRightIcon(ToolbarItemEx itemEx, IMenuItem menuItem)
{
menuItem.SetVisible(true);
menuItem.SetEnabled(itemEx.IsEnabled);
if (string.IsNullOrEmpty(itemEx.Resource))
{
return;
}
var image = SvgToBitmap.GetBitmap(itemEx.Resource, 24, 24);
var icon = new BitmapDrawable(Context.Resources, image);
menuItem.SetIcon(icon);
if (!IsForeColorDefault && itemEx.IsEnabled)
{
menuItem.Icon.SetTint(ForeColor);
}
else if (!itemEx.IsEnabled)
{
menuItem.Icon.SetTint(ForeColor);
menuItem.Icon.SetAlpha(80);
}
}
void UpdateLeftIcon(ToolbarItemEx itemEx, IMenuItem menuItem)
{
if (string.IsNullOrEmpty(itemEx.Resource))
{
return;
}
var image = SvgToBitmap.GetBitmap(itemEx.Resource, 24, 24);
var icon = new BitmapDrawable(Context.Resources, image);
if (!IsForeColorDefault && itemEx.IsEnabled)
{
icon.SetTint(ForeColor);
}
else if (!itemEx.IsEnabled)
{
icon.SetTint(ForeColor);
icon.SetAlpha(80);
}
//戻った時にこうしとかないと表示されない。BeginInvokeOnMainThreadだと失敗することがある。時間も250は必要。
Device.StartTimer(TimeSpan.FromMilliseconds(250), () => {
_toolbar.NavigationIcon = icon;
return(false);
});
_navigationCustomListener?.Dispose();
_navigationCustomListener = new NavigationIconClickListener(itemEx.Command, itemEx.CommandParameter);
_toolbar.SetNavigationOnClickListener(_navigationCustomListener);
menuItem.SetVisible(false);
}
void UpdateIcon(ToolbarItemEx itemEx, UIBarButtonItem nativeItem)
{
itemEx.PropertyChanged -= ItemEx_PropertyChanged;
itemEx.PropertyChanged += ItemEx_PropertyChanged;
if (!itemEx.IsVisible)
{
nativeItem.Image = null;
nativeItem.Title = null;
return;
}
if (string.IsNullOrEmpty(itemEx.Resource))
{
return;
}
nativeItem.Image = SvgToUIImage.GetUIImage(itemEx.Resource, 20, 20);
nativeItem.Title = null;
nativeItem.Style = UIBarButtonItemStyle.Plain;
nativeItem.Enabled = itemEx.IsEnabled;
}
/// <summary>
/// Creates system-style buttons if requested and hooks up CanExecuteChanged for the ToolbarItem command.
/// (after writing this I noticed that the latter will be in the next version of Forms... oh well)
/// </summary>
/// <param name="toolbarItem"></param>
/// <returns></returns>
private UIBarButtonItem CreateUIBarButtonItem(ToolbarItemEx toolbarItem)
{
UIBarButtonSystemItem?systemItem = null;
switch (toolbarItem.ToolbarItemType)
{
case ToolbarItemType.Done:
systemItem = UIBarButtonSystemItem.Done;
break;
case ToolbarItemType.Add:
systemItem = UIBarButtonSystemItem.Add;
break;
case ToolbarItemType.Refresh:
systemItem = UIBarButtonSystemItem.Refresh;
break;
case ToolbarItemType.Search:
systemItem = UIBarButtonSystemItem.Search;
break;
}
var buttonItem = systemItem != null ? new UIBarButtonItem(systemItem.Value, (s, e) => toolbarItem.Activate()) : toolbarItem.ToUIBarButtonItem();
// Xamarin.Forms 1.3.2 adds support for CanExecute, so we only need this for
// our custom system buttons
//
if (systemItem != null)
{
var command = toolbarItem.Command;
EventHandler canExecuteHandler = (s, e) => UpdateButtonState(toolbarItem, buttonItem);
if (command != null)
{
command.CanExecuteChanged += canExecuteHandler;
}
toolbarItem.PropertyChanged += (s, e) =>
{
if (e.PropertyName == ToolbarItem.CommandProperty.PropertyName)
{
if (command != null)
{
command.CanExecuteChanged -= canExecuteHandler;
}
UpdateButtonState(toolbarItem, buttonItem);
if (toolbarItem.Command != null)
{
toolbarItem.Command.CanExecuteChanged += canExecuteHandler;
}
command = toolbarItem.Command;
}
};
UpdateButtonState(toolbarItem, buttonItem);
}
return(buttonItem);
}
private static void UpdateButtonState(ToolbarItemEx toolbarItem, UIBarButtonItem buttonItem)
{
buttonItem.Enabled = toolbarItem.Command?.CanExecute(toolbarItem.CommandParameter) ?? false;
}