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using ElmSharp;
using System.Collections.Generic;
using EColor = ElmSharp.Color;
namespace Xamarin.Forms.Platform.Tizen
{
public abstract class CellRenderer : IRegisterable
{
const string _heightProperty = "Height";
protected static readonly EColor s_defaultTextColor = EColor.Black;
protected static readonly EColor s_defaultBackgroundColor = EColor.White;
readonly Dictionary<Cell, Dictionary<string, EvasObject>> _realizedNativeViews = new Dictionary<Cell, Dictionary<string, EvasObject>>();
protected CellRenderer(string style)
{
Class = new GenItemClass(style)
{
GetTextHandler = GetText,
GetContentHandler = GetContent,
DeleteHandler = ItemDeleted,
};
}
public GenItemClass Class
{
get;
private set;
}
protected virtual bool OnCellPropertyChanged(Cell cell, string property, Dictionary<string, EvasObject> realizedView)
{
if (property == _heightProperty)
{
return true;
}
return false;
}
protected virtual Span OnGetText(Cell cell, string part)
{
return null;
}
protected virtual EvasObject OnGetContent(Cell cell, string part)
{
return null;
}
protected virtual void OnDeleted(Cell cell)
{
}
protected virtual void OnUnrealizedCell(Cell cell)
{
}
protected int FindCellContentHeight(Cell cell)
{
ViewCell viewCell = cell as ViewCell;
if (viewCell != null)
{
var parentWidth = (cell.Parent as VisualElement).Width;
var view = viewCell.View;
return (int)view.Measure(parentWidth, double.PositiveInfinity).Request.Height;
}
else
return -1;
}
static Native.Span ToNative(Span span)
{
var nativeSpan = new Native.Span();
nativeSpan.Text = span.Text;
nativeSpan.ForegroundColor = span.ForegroundColor.IsDefault ? s_defaultTextColor : span.ForegroundColor.ToNative();
nativeSpan.FontAttributes = span.FontAttributes;
nativeSpan.BackgroundColor = span.BackgroundColor.IsDefault ? s_defaultBackgroundColor : span.BackgroundColor.ToNative();
nativeSpan.FontSize = span.FontSize;
nativeSpan.FontFamily = span.FontFamily;
return nativeSpan;
}
internal void SendCellPropertyChanged(Cell cell, GenListItem item, string property)
{
Dictionary<string, EvasObject> realizedView = null;
_realizedNativeViews.TryGetValue(cell, out realizedView);
// just to prevent null reference exception in OnCellPropertyChanged
realizedView = realizedView ?? new Dictionary<string, EvasObject>();
if (property == Cell.IsEnabledProperty.PropertyName)
{
item.IsEnabled = cell.IsEnabled;
}
// if true was returned, item was updated
// if it's possible to update the cell property without Update(), return false
else if (OnCellPropertyChanged(cell, property, realizedView))
{
item.Update();
}
}
internal void SendUnrealizedCell(Cell cell)
{
_realizedNativeViews.Remove(cell);
OnUnrealizedCell(cell);
}
string GetText(object data, string part)
{
var span = OnGetText((data as Native.ListView.ItemContext).Cell, part);
return span != null ? ToNative(span).GetDecoratedText() : null;
}
EvasObject GetContent(object data, string part)
{
var cell = (data as Native.ListView.ItemContext).Cell;
EvasObject nativeView = OnGetContent(cell, part);
if (part != null && nativeView != null)
{
Dictionary<string, EvasObject> realizedView = null;
_realizedNativeViews.TryGetValue(cell, out realizedView);
if (realizedView == null)
{
realizedView = new Dictionary<string, EvasObject>();
_realizedNativeViews[cell] = realizedView;
}
realizedView[part] = nativeView;
nativeView.Deleted += (sender, e) =>
{
realizedView.Remove(part);
};
}
return nativeView;
}
void ItemDeleted(object data)
{
var cell = (data as Native.ListView.ItemContext).Cell;
_realizedNativeViews.Remove(cell);
OnDeleted(cell);
}
}
}
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