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DatePicker.cs
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DatePicker.cs
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using System;
using System.Linq;
using Gtk;
namespace Xamarin.Forms.Platform.GTK.Controls
{
public class DateEventArgs : EventArgs
{
DateTime _date;
public DateTime Date
{
get
{
return _date;
}
}
public DateEventArgs(DateTime date)
{
_date = date;
}
}
public partial class DatePickerWindow : Window
{
VBox _datebox;
RangeCalendar _calendar;
public DatePickerWindow()
: base(WindowType.Popup)
{
BuildDatePickerWindow();
Helpers.GrabHelper.GrabWindow(this);
SelectedDate = DateTime.Now;
}
public DateTime SelectedDate
{
get
{
return _calendar.Date;
}
set
{
_calendar.Date = value;
}
}
public DateTime MinimumDate
{
get
{
return _calendar.MinimumDate;
}
set
{
_calendar.MinimumDate = value;
}
}
public DateTime MaximumDate
{
get
{
return _calendar.MaximumDate;
}
set
{
_calendar.MaximumDate = value;
}
}
public delegate void DateEventHandler(object sender, DateEventArgs args);
public event DateEventHandler OnDateTimeChanged;
protected override bool OnExposeEvent(Gdk.EventExpose args)
{
base.OnExposeEvent(args);
int winWidth, winHeight;
GetSize(out winWidth, out winHeight);
GdkWindow.DrawRectangle(
Style.ForegroundGC(StateType.Insensitive), false, 0, 0, winWidth - 1, winHeight - 1);
return false;
}
protected virtual void OnButtonPressEvent(object o, ButtonPressEventArgs args)
{
Close();
}
protected virtual void OnCalendarButtonPressEvent(object o, ButtonPressEventArgs args)
{
args.RetVal = true;
}
protected virtual void OnCalendarDaySelected(object sender, EventArgs e)
{
OnDateTimeChanged?.Invoke(this, new DateEventArgs(SelectedDate));
}
protected virtual void OnCalendarDaySelectedDoubleClick(object sender, EventArgs e)
{
OnDateTimeChanged?.Invoke(this, new DateEventArgs(SelectedDate));
Close();
}
private void BuildDatePickerWindow()
{
Title = "DatePicker";
TypeHint = Gdk.WindowTypeHint.Desktop;
WindowPosition = WindowPosition.Mouse;
BorderWidth = 1;
Resizable = false;
AllowGrow = false;
Decorated = false;
DestroyWithParent = true;
SkipPagerHint = true;
SkipTaskbarHint = true;
_datebox = new VBox();
_datebox.Spacing = 6;
_datebox.BorderWidth = 3;
_calendar = new RangeCalendar();
_calendar.CanFocus = true;
_calendar.DisplayOptions = CalendarDisplayOptions.ShowHeading;
_datebox.Add(_calendar);
Box.BoxChild dateBoxChild = ((Box.BoxChild)(_datebox[_calendar]));
dateBoxChild.Position = 0;
Add(_datebox);
if ((Child != null))
{
Child.ShowAll();
}
Show();
ButtonPressEvent += new ButtonPressEventHandler(OnButtonPressEvent);
_calendar.ButtonPressEvent += new ButtonPressEventHandler(OnCalendarButtonPressEvent);
_calendar.DaySelected += new EventHandler(OnCalendarDaySelected);
_calendar.DaySelectedDoubleClick += new EventHandler(OnCalendarDaySelectedDoubleClick);
}
void Close()
{
Helpers.GrabHelper.RemoveGrab(this);
Destroy();
}
void NotifyDateChanged()
{
OnDateTimeChanged?.Invoke(this, new DateEventArgs(SelectedDate));
}
class RangeCalendar : Calendar
{
DateTime _minimumDate;
DateTime _maximumDate;
public RangeCalendar()
{
_minimumDate = new DateTime(1900, 1, 1);
_maximumDate = new DateTime(2199, 1, 1);
}
public DateTime MinimumDate
{
get
{
return _minimumDate;
}
set
{
if (MaximumDate < value)
{
throw new InvalidOperationException($"{nameof(MinimumDate)} must be lower than {nameof(MaximumDate)}");
}
_minimumDate = value;
}
}
public DateTime MaximumDate
{
get
{
return _maximumDate;
}
set
{
if (MinimumDate > value)
{
throw new InvalidOperationException($"{nameof(MaximumDate)} must be greater than {nameof(MinimumDate)}");
}
_maximumDate = value;
}
}
protected override void OnDaySelected()
{
if (Date < MinimumDate)
{
Date = MinimumDate;
}
if (Date > MaximumDate)
{
Date = MaximumDate;
}
}
}
}
public partial class DatePicker : EventBox
{
CustomComboBox _comboBox;
Gdk.Color _color;
DateTime _currentDate;
DateTime _minDate;
DateTime _maxDate;
string _dateFormat;
public event EventHandler DateChanged;
public event EventHandler GotFocus;
public event EventHandler LostFocus;
public DatePicker()
{
BuildDatePicker();
CurrentDate = DateTime.Now;
TextColor = _comboBox.Entry.Style.Text(StateType.Normal);
_comboBox.Entry.CanDefault = false;
_comboBox.Entry.CanFocus = false;
_comboBox.Entry.IsEditable = false;
_comboBox.Entry.State = StateType.Normal;
_comboBox.Entry.FocusGrabbed += new EventHandler(OnEntryFocused);
_comboBox.PopupButton.Clicked += new EventHandler(OnBtnShowCalendarClicked);
}
public DateTime CurrentDate
{
get
{
return _currentDate;
}
set
{
_currentDate = value;
UpdateEntryText();
}
}
public DateTime MinDate
{
get
{
return _minDate;
}
set
{
_minDate = value;
}
}
public DateTime MaxDate
{
get
{
return _maxDate;
}
set
{
_maxDate = value;
}
}
public Gdk.Color TextColor
{
get
{
return _color;
}
set
{
_color = value;
_comboBox.Color = _color;
}
}
public string DateFormat
{
get
{
return _dateFormat;
}
set
{
_dateFormat = value;
UpdateEntryText();
}
}
public void SetBackgroundColor(Gdk.Color color)
{
_comboBox.SetBackgroundColor(color);
}
public void OpenPicker()
{
ShowPickerWindow();
}
public void ClosePicker()
{
var windows = Window.ListToplevels();
var window = windows.FirstOrDefault(w => w.GetType() == typeof(DatePickerWindow));
if (window != null)
{
Remove(window);
}
}
void ShowPickerWindow()
{
int x = 0;
int y = 0;
GdkWindow.GetOrigin(out x, out y);
y += Allocation.Height;
var picker = new DatePickerWindow();
picker.Move(x, y);
picker.SelectedDate = CurrentDate;
picker.MinimumDate = _minDate;
picker.MaximumDate = _maxDate;
picker.OnDateTimeChanged += OnPopupDateChanged;
picker.Destroyed += OnPickerClosed;
}
void OnPopupDateChanged(object sender, DateEventArgs args)
{
var date = args.Date;
if (date < MinDate)
{
CurrentDate = MinDate;
return;
}
if (date > MaxDate)
{
CurrentDate = MaxDate;
return;
}
CurrentDate = args.Date;
DateChanged?.Invoke(this, EventArgs.Empty);
}
void BuildDatePicker()
{
_comboBox = new CustomComboBox();
Add(_comboBox);
if ((Child != null))
{
Child.ShowAll();
}
Show();
}
void UpdateEntryText()
{
_comboBox.Entry.Text = _currentDate.ToString(string.IsNullOrEmpty(_dateFormat) ? "D" : _dateFormat);
}
void OnBtnShowCalendarClicked(object sender, EventArgs e)
{
ShowPickerWindow();
}
void OnEntryFocused(object sender, EventArgs e)
{
ShowPickerWindow();
GotFocus?.Invoke(this, EventArgs.Empty);
}
void OnPickerClosed(object sender, EventArgs e)
{
var window = sender as DatePickerWindow;
if (window != null)
{
Remove(window);
LostFocus?.Invoke(this, EventArgs.Empty);
}
}
}
}