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@nicwise nicwise/gist:9629210
Created Mar 18, 2014

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Expandable Date Element for MT.D
using System;
using MonoTouch.Dialog;
using MonoTouch.UIKit;
using System.Drawing;
using MonoTouch.Foundation;
using System.Collections.Generic;
using System.Globalization;
namespace TravelBudget
{
public class StyledExpandableDateElement : Element, IElementSizing
{
public Action<DateTime> ValueChanged;
DateTime _time = DateTime.Now;
public DateTime Value
{
get { return _time; }
set
{
if (_time != value)
{
_time = value;
UpdateText ();
if (ValueChanged != null)
ValueChanged (Value);
}
}
}
UIDatePickerMode _mode;
public UIDatePickerMode Mode
{
get { return _mode; }
set
{
_mode = value;
}
}
readonly RootElement _root;
readonly Section _section;
UIDatePicker _picker;
Element _pickerElement;
UITableViewCell _cell;
bool minDateSet = false;
bool maxDateSet = false;
DateTime maxDate = DateTime.MaxValue;
DateTime minDate = DateTime.MinValue;
public DateTime MaxDate
{
get
{
return maxDate;
}
set
{
maxDate = value;
maxDateSet = true;
}
}
public DateTime MinDate
{
get
{
return minDate;
}
set
{
minDate = value;
minDateSet = true;
}
}
public StyledExpandableDateElement (string caption, DateTime dateTime, UIDatePickerMode mode, RootElement root, Section section) : base (caption)
{
Mode = mode;
//Handle issues where time values are set and the date isn't. This leads to odd behavor.
if (mode == UIDatePickerMode.Time)
{
if (dateTime.Year < 2000)
{
var currentDate = DateTime.Now;
dateTime = new DateTime (currentDate.Year, currentDate.Month, currentDate.Day, dateTime.Hour, dateTime.Minute, dateTime.Second);
}
}
Value = dateTime;
_root = root;
_section = section;
}
public override UITableViewCell GetCell (UITableView tv)
{
const string cellKey = "StyledExpandableDateElement";
var cell = tv.DequeueReusableCell (cellKey);
if (cell == null)
{
cell = new UITableViewCell (UITableViewCellStyle.Value1, cellKey);
cell.TextLabel.Font = UIFont.SystemFontOfSize (17f);
cell.TextLabel.TextColor = UIColor.Black;
cell.TextLabel.AdjustsFontSizeToFitWidth = true;
cell.TextLabel.MinimumScaleFactor = .5f;
cell.Accessory = UITableViewCellAccessory.None;
cell.SelectionStyle = UITableViewCellSelectionStyle.None;
cell.DetailTextLabel.Font = UIFont.SystemFontOfSize (16f);
cell.DetailTextLabel.TextColor = UIColor.LightGray;
cell.DetailTextLabel.AdjustsFontSizeToFitWidth = true;
cell.DetailTextLabel.MinimumScaleFactor = .5f;
}
_cell = cell;
cell.TextLabel.Text = Caption;
UpdateText ();
return cell;
}
public float GetHeight (UITableView tableView, NSIndexPath indexPath)
{
return 44;
}
protected internal NSDateFormatter fmt = new NSDateFormatter () {
DateStyle = NSDateFormatterStyle.Medium,
TimeZone = NSTimeZone.LocalTimeZone
};
protected internal NSDateFormatter fullFormat = new NSDateFormatter () {
DateFormat = "yyyy-MM-dd'|'HH:mm",
TimeZone = NSTimeZone.LocalTimeZone
};
public void Contract()
{
if (_picker != null)
{
_section.Remove (_pickerElement);
//_root.Reload (_section, UITableViewRowAnimation.Fade);
_pickerElement.Dispose ();
_picker.Dispose ();
_pickerElement = null;
_picker = null;
_cell.DetailTextLabel.TextColor = UIColor.LightGray;
}
}
public override void Selected (DialogViewController dvc, UITableView tableView, NSIndexPath path)
{
base.Selected (dvc, tableView, path);
_root.TableView.EndEditing (true);
if (_picker == null)
{
var otherExpandableItems = new List<StyledExpandableDateElement> ();
foreach(var element in _section)
{
if (element is StyledExpandableDateElement && element != this)
{
otherExpandableItems.Add (element as StyledExpandableDateElement);
}
}
foreach(var element in otherExpandableItems)
{
element.Contract ();
}
int left = 0;
_picker = new UIDatePicker (new RectangleF (left, 0, 320, 200)) {
Mode = Mode,
Date = Value,
TimeZone = NSTimeZone.LocalTimeZone
};
_picker.TimeZone = NSTimeZone.LocalTimeZone;
if (minDateSet)
_picker.MinimumDate = minDate;
if (maxDateSet)
_picker.MaximumDate = maxDate;
_picker.BackgroundColor = UIColor.White;
_picker.ValueChanged += (object sender, EventArgs e) =>
{
UIDatePicker picker = sender as UIDatePicker;
string internalAsString = fullFormat.ToString (_picker.Date);
DateTime dt;
if (DateTime.TryParseExact (internalAsString, "yyyy-MM-dd|HH:mm", CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out dt))
{
Value = dt;
} else
{
Value = _picker.Date;
}
Console.WriteLine("Value: " + Value);
};
_cell.DetailTextLabel.TextColor = UIColor.Blue;
_pickerElement = new UIViewElement ("", _picker, true);
var idx = _section.Elements.IndexOf (this);
var elements = new List<Element> {
_pickerElement
};
_section.Insert (idx + 1, UITableViewRowAnimation.Top, elements);
_root.TableView.ScrollToRow (IndexPath, UITableViewScrollPosition.Bottom, true);
} else
{
Contract ();
_root.TableView.ScrollToRow (IndexPath, UITableViewScrollPosition.Middle, true);
}
}
void UpdateText ()
{
string text;
switch (Mode)
{
case UIDatePickerMode.Date:
text = Value.ToShortDateString ();
break;
case UIDatePickerMode.DateAndTime:
text = Value.ToShortDateString () + " " + Value.ToShortTimeString ();
break;
case UIDatePickerMode.Time:
text = Value.ToShortTimeString ();
break;
default:
text = "";
break;
}
if (_cell != null)
{
_cell.DetailTextLabel.Text = text;
}
}
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (_picker != null)
{
_picker.Dispose ();
}
if (_pickerElement != null)
{
_pickerElement.Dispose ();
}
_cell = null;
}
base.Dispose (disposing);
}
}
}
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