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using System;
using System.Linq;
using System.ComponentModel;
using AppKit;
using CoreGraphics;
namespace Xamarin.Forms.Platform.MacOS
{
internal class CellNSView : NSView, INativeElementView
{
static readonly NSColor s_defaultChildViewsBackground = NSColor.Clear;
static readonly CGColor s_defaultHeaderViewsBackground = NSColor.LightGray.CGColor;
Cell _cell;
readonly NSTableViewCellStyle _style;
NSView _contexActionsTrackingView;
public Action<object, PropertyChangedEventArgs> PropertyChanged;
public CellNSView(NSTableViewCellStyle style)
{
WantsLayer = true;
_style = style;
CreateUI();
}
public NSTextField TextLabel { get; private set; }
public NSTextField DetailTextLabel { get; private set; }
public NSImageView ImageView { get; private set; }
public NSView AccessoryView { get; private set; }
public virtual Element Element => Cell;
public Cell Cell
{
get { return _cell; }
set
{
if (_cell == value)
return;
ICellController cellController = _cell;
if (cellController != null)
Device.BeginInvokeOnMainThread(cellController.SendDisappearing);
_cell = value;
cellController = value;
if (cellController != null)
Device.BeginInvokeOnMainThread(cellController.SendAppearing);
}
}
public void HandlePropertyChanged(object sender, PropertyChangedEventArgs e)
{
PropertyChanged?.Invoke(this, e);
}
public override void Layout()
{
const int padding = 10;
nfloat availableHeight = Frame.Height;
nfloat availableWidth = Frame.Width - padding * 2;
nfloat imageWidth = 0;
nfloat accessoryViewWidth = 0;
if (ImageView != null)
{
nfloat imageHeight = imageWidth = availableHeight;
ImageView.Frame = new CGRect(padding, 0, imageWidth, imageHeight);
}
if (AccessoryView != null)
{
accessoryViewWidth = _style == NSTableViewCellStyle.Value1 ? 50 : availableWidth - 100;
AccessoryView.Frame = new CGRect(availableWidth - accessoryViewWidth + padding, 0, accessoryViewWidth,
availableHeight);
foreach (var subView in AccessoryView.Subviews)
{
//try to find the size the control wants, if no width use default width
var size = subView.FittingSize;
if (size.Width == 0)
size.Width = accessoryViewWidth;
var x = AccessoryView.Bounds.Width - size.Width;
var y = (AccessoryView.Bounds.Height - size.Height) / 2;
subView.Frame = new CGRect(new CGPoint(x, y), size);
}
}
nfloat labelHeights = availableHeight;
nfloat labelWidth = availableWidth - imageWidth - accessoryViewWidth;
if (DetailTextLabel != null)
{
if (!string.IsNullOrEmpty(DetailTextLabel?.StringValue))
{
labelHeights = availableHeight / 2;
DetailTextLabel.CenterTextVertically(new CGRect(imageWidth + padding, 0, labelWidth, labelHeights));
}
}
TextLabel?.CenterTextVertically(new CGRect(imageWidth + padding, availableHeight - labelHeights, labelWidth,
labelHeights));
var topNSView = Subviews.LastOrDefault();
if (_contexActionsTrackingView != topNSView)
{
_contexActionsTrackingView.RemoveFromSuperview();
_contexActionsTrackingView.Frame = Frame;
AddSubview(_contexActionsTrackingView, NSWindowOrderingMode.Above, Subviews.LastOrDefault());
}
base.Layout();
}
internal static NSView GetNativeCell(NSTableView tableView, Cell cell, string templateId = "", bool isHeader = false,
bool isRecycle = false)
{
var reusable = tableView.MakeView(templateId, tableView);
NSView nativeCell;
if (reusable == null || !isRecycle)
{
var renderer = (CellRenderer)Registrar.Registered.GetHandler(cell.GetType());
nativeCell = renderer.GetCell(cell, null, tableView);
}
else
{
nativeCell = reusable;
}
if (string.IsNullOrEmpty(nativeCell.Identifier))
nativeCell.Identifier = templateId;
if (!isHeader) return nativeCell;
if (nativeCell.Layer != null) nativeCell.Layer.BackgroundColor = s_defaultHeaderViewsBackground;
return nativeCell;
}
void CreateUI()
{
var style = _style;
if (style != NSTableViewCellStyle.Empty)
{
AddSubview(TextLabel = new NSTextField
{
Bordered = false,
Selectable = false,
Editable = false,
Font = NSFont.LabelFontOfSize(NSFont.SystemFontSize)
});
TextLabel.Cell.BackgroundColor = s_defaultChildViewsBackground;
if (style == NSTableViewCellStyle.Image || style == NSTableViewCellStyle.Subtitle ||
style == NSTableViewCellStyle.ImageSubtitle)
{
AddSubview(DetailTextLabel = new NSTextField
{
Bordered = false,
Selectable = false,
Editable = false,
Font = NSFont.LabelFontOfSize(NSFont.SmallSystemFontSize)
});
DetailTextLabel.Cell.BackgroundColor = s_defaultChildViewsBackground;
}
if (style == NSTableViewCellStyle.Image || style == NSTableViewCellStyle.ImageSubtitle)
AddSubview(ImageView = new NSImageView());
if (style == NSTableViewCellStyle.Value1 || style == NSTableViewCellStyle.Value2)
{
var accessoryView = new NSView { WantsLayer = true };
accessoryView.Layer.BackgroundColor = s_defaultChildViewsBackground.CGColor;
AddSubview(AccessoryView = accessoryView);
}
}
AddSubview(_contexActionsTrackingView = new TrackingClickNSView());
}
}
class TrackingClickNSView : NSView
{
public override void RightMouseDown(NSEvent theEvent)
{
HandleContextActions(theEvent);
base.RightMouseDown(theEvent);
}
void HandleContextActions(NSEvent theEvent)
{
var contextActionCell = (Superview as INativeElementView).Element as Cell;
var contextActionsCount = contextActionCell.ContextActions.Count;
if (contextActionsCount > 0)
{
NSMenu menu = new NSMenu();
for (int i = 0; i < contextActionsCount; i++)
{
var contextAction = contextActionCell.ContextActions[i];
var nsMenuItem = GetNSMenuItem(i, contextAction);
menu.AddItem(nsMenuItem);
}
NSMenu.PopUpContextMenu(menu, theEvent, this);
}
}
static NSMenuItem GetNSMenuItem(int i, MenuItem contextAction)
{
var menuItem = new NSMenuItem(contextAction.Text ?? "");
menuItem.Tag = i;
menuItem.Enabled = contextAction.IsEnabled;
if (menuItem.Enabled)
menuItem.Activated += (sender, e) =>
{
((IMenuItemController)contextAction).Activate();
};
if (!string.IsNullOrEmpty(contextAction.Icon))
menuItem.Image = new NSImage(contextAction.Icon);
return menuItem;
}
}
}
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