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using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using ElmSharp;
using EToolbarItem = ElmSharp.ToolbarItem;
using EToolbarItemEventArgs = ElmSharp.ToolbarItemEventArgs;
namespace Xamarin.Forms.Platform.Tizen
{
public class TabbedPageRenderer : VisualElementRenderer<TabbedPage>, IVisualElementRenderer
{
Box _box;
Toolbar _tpage;
EvasObject _tcontent;
Dictionary<EToolbarItem, Page> _itemToItemPage = new Dictionary<EToolbarItem, Page>();
public TabbedPageRenderer ()
{
//Register for title change property
RegisterPropertyHandler(TabbedPage.TitleProperty, UpdateTitle);
//Register for current page change property
RegisterPropertyHandler("CurrentPage", CurrentPageChanged);
//TODO renderer should add item on EFL toolbar when new Page is added to TabbedPage
}
protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
{
if (_tpage == null)
{
//Create box that holds toolbar and selected content
_box = new Box(Forms.Context.MainWindow)
{
AlignmentX = -1,
AlignmentY = -1,
WeightX = 1,
WeightY = 1,
IsHorizontal = false,
};
_box.Show();
//Create toolbar that is placed inside the _box
_tpage = new Toolbar(Forms.Context.MainWindow)
{
AlignmentX = -1,
WeightX = 1,
ShrinkMode = ToolbarShrinkMode.Expand,
SelectionMode = ToolbarSelectionMode.Always,
};
_tpage.Show();
//Add callback for item selection
_tpage.Selected += OnCurrentPageChanged;
_box.PackEnd(_tpage);
SetNativeControl(_box);
UpdateTitle();
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (_box != null)
{
_box.Unrealize();
_box = null;
}
if (_tpage != null)
{
_tpage.Selected -= OnCurrentPageChanged;
_tpage.Unrealize();
_tpage = null;
}
base.Dispose(disposing);
}
protected override void OnElementReady()
{
FillToolbar();
base.OnElementReady();
}
void UpdateTitle()
{
_tpage.Text = Element.Title;
}
void UpdateTitle(Page page)
{
if (_itemToItemPage.ContainsValue(page))
{
var pair = _itemToItemPage.FirstOrDefault(x => x.Value == page);
pair.Key.SetPartText(null, pair.Value.Title);
}
}
void OnPageTitleChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == Page.TitleProperty.PropertyName)
{
UpdateTitle(sender as Page);
}
}
void FillToolbar()
{
var logicalChildren = (Element as IElementController).LogicalChildren;
bool hasIcon = false;
//add items to toolbar
foreach (Page child in logicalChildren)
{
var childRenderer = Platform.GetRenderer(child);
if (childRenderer != null)
{
childRenderer.NativeView.Hide();
}
EToolbarItem toolbarItem;
if (string.IsNullOrEmpty(child.Icon))
{
toolbarItem = _tpage.Append(child.Title);
}
else
{
//elm_toobar style and size hint must be changed at least once before adding the toolbar item having icon.
if (!hasIcon)
{
int windowHeight = Forms.Context.MainWindow.Geometry.Height;
//This value is from efl-theme-tizen-mobile theme. (NAVIFRAME_TABBAR_HEIGHT_WITH_TITLE_INC 80)
double requiredToolbarHeight = 80.0;
double toolBarWeight = requiredToolbarHeight/windowHeight;
_tpage.Style="tabbar";
_tpage.TransverseExpansion = true;
_tpage.SetAlignment(-1,-1);
_tpage.SetWeight(1, toolBarWeight);
_box.SetAlignment(-1,-1);
_box.SetWeight(1, 1- toolBarWeight);
hasIcon = true;
}
toolbarItem = _tpage.Append(child.Title, ResourcePath.GetPath(child.Icon));
}
_itemToItemPage.Add(toolbarItem, child);
if (Element.CurrentPage == child)
{
//select item on the toolbar and fill content
toolbarItem.IsSelected = true;
OnCurrentPageChanged(null, null);
}
child.PropertyChanged += OnPageTitleChanged;
}
}
void OnCurrentPageChanged(object sender, EToolbarItemEventArgs e)
{
if (_tpage.SelectedItem == null)
return;
Element.CurrentPage = _itemToItemPage[_tpage.SelectedItem];
//detach content from view without EvasObject changes
if (_tcontent != null)
{
//hide content that should not be visible
_tcontent.Hide();
//unpack content that is hiden an prepare for new content
_box.UnPack(_tcontent);
}
//create EvasObject using renderer and remember to not destroy
//it for better performance (creat once)
_tcontent = Platform.GetOrCreateRenderer(Element.CurrentPage).NativeView;
_tcontent.SetAlignment(-1, -1);
_tcontent.SetWeight(1, 1);
_tcontent.Show();
_box.PackEnd(_tcontent);
}
void CurrentPageChanged()
{
foreach (KeyValuePair<EToolbarItem, Page> pair in _itemToItemPage)
{
if (pair.Value == Element.CurrentPage)
{
pair.Key.IsSelected = true;
return;
}
}
}
}
}
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