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using System;
using AppKit;
using Foundation;
namespace Xamarin.Forms.Platform.MacOS
{
internal class TableViewDataSource : NSTableViewSource
{
static int s_sectionCount;
const string HeaderIdentifier = nameof(TextCell);
const string ItemIdentifier = nameof(ViewCell);
protected ITableViewController Controller => _tableView;
readonly NSTableView _nsTableView;
readonly TableView _tableView;
public TableViewDataSource(TableViewRenderer tableViewRenderer)
{
_tableView = tableViewRenderer.Element;
_nsTableView = tableViewRenderer.TableView;
Controller.ModelChanged += (s, e) => { _nsTableView?.ReloadData(); };
AutomaticallyDeselect = true;
}
public bool AutomaticallyDeselect { get; set; }
public override void SelectionDidChange(NSNotification notification)
{
var row = _nsTableView.SelectedRow;
if (row == -1)
return;
int sectionIndex;
bool isHeader;
int itemIndexInSection;
GetComputedIndexes(row, out sectionIndex, out itemIndexInSection, out isHeader);
var cell = Controller.Model.GetCell(sectionIndex, itemIndexInSection);
Controller.Model.RowSelected(cell);
if (AutomaticallyDeselect)
_nsTableView.DeselectRow(row);
}
public override nint GetRowCount(NSTableView tableView)
{
nint count = 0;
s_sectionCount = Controller.Model.GetSectionCount();
for (int i = 0; i < s_sectionCount; i++)
{
count += Controller.Model.GetRowCount(i) + 1;
}
return count;
}
public override bool ShouldSelectRow(NSTableView tableView, nint row)
{
int sectionIndex;
bool isHeader;
int itemIndexInSection;
GetComputedIndexes(row, out sectionIndex, out itemIndexInSection, out isHeader);
return !isHeader;
}
public override NSView GetViewForItem(NSTableView tableView, NSTableColumn tableColumn, nint row)
{
int sectionIndex;
bool isHeader;
int itemIndexInSection;
GetComputedIndexes(row, out sectionIndex, out itemIndexInSection, out isHeader);
string id;
Cell cell;
if (isHeader)
{
id = HeaderIdentifier;
cell = Controller.Model.GetHeaderCell(sectionIndex) ??
new TextCell { Text = Controller.Model.GetSectionTitle(sectionIndex) };
}
else
{
id = ItemIdentifier;
cell = Controller.Model.GetCell(sectionIndex, itemIndexInSection);
}
var nativeCell = CellNSView.GetNativeCell(tableView, cell, id, isHeader);
return nativeCell;
}
void GetComputedIndexes(nint row, out int sectionIndex, out int itemIndexInSection, out bool isHeader)
{
var totalItems = 0;
isHeader = false;
sectionIndex = 0;
itemIndexInSection = 0;
for (int i = 0; i < s_sectionCount; i++)
{
var groupCount = Controller.Model.GetRowCount(i);
var itemsInSection = groupCount + 1;
if (row < totalItems + itemsInSection)
{
sectionIndex = i;
itemIndexInSection = (int)row - totalItems;
isHeader = itemIndexInSection == 0;
if (isHeader)
itemIndexInSection = -1;
else
itemIndexInSection = itemIndexInSection - 1;
break;
}
totalItems += itemsInSection;
}
}
}
//TODO: Implement Uneven rows
internal class UnEvenTableViewModelRenderer : TableViewDataSource
{
public UnEvenTableViewModelRenderer(TableViewRenderer model) : base(model)
{
}
}
}
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