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using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Xamarin.Forms.PlatformConfiguration.WindowsSpecific;
namespace Xamarin.Forms.Platform.UWP
{
internal class ToolbarPlacementHelper
{
Border _bottomCommandBarArea;
CommandBar _commandBar;
Func<ToolbarPlacement> _getToolbarPlacement;
Border _titleArea;
Border _topCommandBarArea;
public void Initialize(CommandBar commandBar, Func<ToolbarPlacement> getToolbarPlacement,
Func<string, DependencyObject> getTemplateChild)
{
_commandBar = commandBar;
_getToolbarPlacement = getToolbarPlacement;
_bottomCommandBarArea = getTemplateChild("BottomCommandBarArea") as Border;
_topCommandBarArea = getTemplateChild("TopCommandBarArea") as Border;
_titleArea = getTemplateChild("TitleArea") as Border;
if (_commandBar != null && _bottomCommandBarArea != null && _topCommandBarArea != null)
{
// We have to wait for the command bar to load so that it'll be in the control hierarchy
// otherwise we can't properly move it to wherever the toolbar is supposed to be
_commandBar.Loaded += (sender, args) =>
{
UpdateToolbarPlacement();
UpdateIsInValidLocation();
};
}
}
public void UpdateToolbarPlacement()
{
if (_commandBar == null || _getToolbarPlacement == null || _bottomCommandBarArea == null ||
_topCommandBarArea == null)
{
// Template hasn't been applied yet, so we're not ready to update the toolbar placement
return;
}
UpdateToolbarPlacement(_commandBar, _getToolbarPlacement(), _bottomCommandBarArea, _topCommandBarArea, _titleArea);
}
static void UpdateToolbarPlacement(CommandBar toolbar, ToolbarPlacement toolbarPlacement, Border bottomCommandBarArea,
Border topCommandBarArea, Border titleArea)
{
// Figure out what's hosting the command bar right now
var current = toolbar.Parent as Border;
// And figure out where it should be
Border target;
switch (toolbarPlacement)
{
case ToolbarPlacement.Top:
target = topCommandBarArea;
break;
case ToolbarPlacement.Bottom:
target = bottomCommandBarArea;
break;
case ToolbarPlacement.Default:
default:
target = Device.Idiom == TargetIdiom.Phone ? bottomCommandBarArea : topCommandBarArea;
break;
}
if (current == null || target == null || current == target)
{
return;
}
// Remove the command bar from its current host and add it to the new one
current.Child = null;
target.Child = toolbar;
if (titleArea != null)
{
if (target == bottomCommandBarArea)
{
// If the title is hosted in the command bar and we're moving the command bar to the bottom,
// put the title into the topCommandBarArea
toolbar.Content = null;
topCommandBarArea.Child = titleArea;
}
else
{
// Put the title back into the command bar
toolbar.Content = titleArea;
}
}
}
// For the time being, keeping this logic for dealing with consistency between the platforms
// re: toolbar visibility here; at some point we should be separating toolbars from navigation bars,
// and this won't be necessary
bool _shouldShowToolBar;
public bool ShouldShowToolBar
{
get { return _shouldShowToolBar; }
set
{
_shouldShowToolBar = value;
UpdateIsInValidLocation();
}
}
void UpdateIsInValidLocation()
{
var formsCommandBar = _commandBar as FormsCommandBar;
if (formsCommandBar != null)
{
formsCommandBar.IsInValidLocation = ShouldShowToolBar;
}
}
}
}
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