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using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using ElmSharp;
using EToolbarItem = ElmSharp.ToolbarItem;
using EToolbarItemEventArgs = ElmSharp.ToolbarItemEventArgs;
using EColor = ElmSharp.Color;
using Xamarin.Forms.PlatformConfiguration.TizenSpecific;
namespace Xamarin.Forms.Platform.Tizen
{
public class TabbedPageRenderer : VisualElementRenderer<TabbedPage>, IVisualElementRenderer
{
Box _box;
Toolbar _toolbar;
EvasObject _content;
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
RegisterPropertyHandler(TabbedPage.BarBackgroundColorProperty, UpdateBarBackgroundColor);
}
protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
{
if (_toolbar == 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
_toolbar = new Toolbar(Forms.Context.MainWindow)
{
AlignmentX = -1,
WeightX = 1,
SelectionMode = ToolbarSelectionMode.Always,
};
if (Device.Idiom == TargetIdiom.Phone)
{
//Set ShrinkMode to Expand as default only for Mobile profile
_toolbar.ShrinkMode = ToolbarShrinkMode.Expand;
}
else if (Device.Idiom == TargetIdiom.TV)
{
//According to TV UX Guideleine, toolbar style should be set to "tabbar_with_title" in case of TabbedPage
_toolbar.Style = "tabbar_with_title";
}
_toolbar.Show();
//Add callback for item selection
_toolbar.Selected += OnCurrentPageChanged;
_box.PackEnd(_toolbar);
SetNativeControl(_box);
UpdateTitle();
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (_box != null)
{
_box.Unrealize();
_box = null;
}
if (_toolbar != null)
{
_toolbar.Selected -= OnCurrentPageChanged;
_toolbar.Unrealize();
_toolbar = null;
}
base.Dispose(disposing);
}
protected override void OnElementReady()
{
FillToolbar();
base.OnElementReady();
}
protected override void UpdateThemeStyle()
{
var style = Element.OnThisPlatform().GetStyle();
if (!string.IsNullOrEmpty(style))
{
_toolbar.Style = style;
((IVisualElementController)Element).NativeSizeChanged();
}
}
void UpdateBarBackgroundColor()
{
EColor bgColor = Element.BarBackgroundColor.ToNative();
_toolbar.BackgroundColor = bgColor;
foreach (EToolbarItem item in _itemToItemPage.Keys)
{
if (Element.BarBackgroundColor == Color.Default)
{
item.DeletePartColor("bg");
}
else
{
item.SetPartColor("bg", bgColor);
}
}
}
void UpdateTitle()
{
_toolbar.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;
//add items to toolbar
foreach (Page child in logicalChildren)
{
var childRenderer = Platform.GetRenderer(child);
if (childRenderer != null)
{
childRenderer.NativeView.Hide();
}
EToolbarItem toolbarItem = _toolbar.Append(child.Title, string.IsNullOrEmpty(child.Icon) ? null : ResourcePath.GetPath(child.Icon));
if (Element.BarBackgroundColor != Color.Default)
{
toolbarItem.SetPartColor("bg", _toolbar.BackgroundColor);
}
_itemToItemPage.Add(toolbarItem, child);
if (Element.CurrentPage == child)
{
//select item on the toolbar and fill content
toolbarItem.IsSelected = true;
CreateNewPage();
}
child.PropertyChanged += OnPageTitleChanged;
}
}
void OnCurrentPageChanged(object sender, EToolbarItemEventArgs e)
{
if (_toolbar.SelectedItem == null)
return;
var selectedContent = Platform.GetRenderer(_itemToItemPage[e.Item]).NativeView;
if (selectedContent == _content)
return;
//detach content from view without EvasObject changes
if (_content != null)
{
//hide content that should not be visible
_content.Hide();
//unpack content that is hiden an prepare for new content
_box.UnPack(_content);
Element.CurrentPage?.SendDisappearing();
}
Element.CurrentPage = _itemToItemPage[_toolbar.SelectedItem];
CreateNewPage();
}
void CreateNewPage()
{
//create EvasObject using renderer and remember to not destroy
//it for better performance (create once)
_content = Platform.GetOrCreateRenderer(Element.CurrentPage).NativeView;
_content.SetAlignment(-1, -1);
_content.SetWeight(1, 1);
_content.Show();
_box.PackEnd(_content);
Element.CurrentPage?.SendAppearing();
}
void CurrentPageChanged()
{
foreach (KeyValuePair<EToolbarItem, Page> pair in _itemToItemPage)
{
if (pair.Value == Element.CurrentPage)
{
pair.Key.IsSelected = true;
return;
}
}
}
}
}
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