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TimeField.cs
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TimeField.cs
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//
// TimeField.cs: text entry for time
//
// Author: Jörg Preiß
//
// Licensed under the MIT license
using System;
using System.Globalization;
using System.Linq;
using NStack;
namespace Terminal.Gui {
/// <summary>
/// Time editing <see cref="View"/>
/// </summary>
/// <remarks>
/// The <see cref="TimeField"/> <see cref="View"/> provides time editing functionality with mouse support.
/// </remarks>
public class TimeField : TextField {
TimeSpan time;
bool isShort;
int longFieldLen = 8;
int shortFieldLen = 5;
string sepChar;
string longFormat;
string shortFormat;
int fieldLen => isShort ? shortFieldLen : longFieldLen;
string format => isShort ? shortFormat : longFormat;
/// <summary>
/// TimeChanged event, raised when the Date has changed.
/// </summary>
/// <remarks>
/// This event is raised when the <see cref="Time"/> changes.
/// </remarks>
/// <remarks>
/// The passed <see cref="EventArgs"/> is a <see cref="DateTimeEventArgs{T}"/> containing the old value, new value, and format string.
/// </remarks>
public event Action<DateTimeEventArgs<TimeSpan>> TimeChanged;
/// <summary>
/// Initializes a new instance of <see cref="TimeField"/> using <see cref="LayoutStyle.Absolute"/> positioning.
/// </summary>
/// <param name="x">The x coordinate.</param>
/// <param name="y">The y coordinate.</param>
/// <param name="time">Initial time.</param>
/// <param name="isShort">If true, the seconds are hidden. Sets the <see cref="IsShortFormat"/> property.</param>
public TimeField (int x, int y, TimeSpan time, bool isShort = false) : base (x, y, isShort ? 7 : 10, "")
{
Initialize (time, isShort);
}
/// <summary>
/// Initializes a new instance of <see cref="TimeField"/> using <see cref="LayoutStyle.Computed"/> positioning.
/// </summary>
/// <param name="time">Initial time</param>
public TimeField (TimeSpan time) : base (string.Empty)
{
Width = fieldLen + 2;
Initialize (time);
}
/// <summary>
/// Initializes a new instance of <see cref="TimeField"/> using <see cref="LayoutStyle.Computed"/> positioning.
/// </summary>
public TimeField () : this (time: TimeSpan.MinValue) { }
void Initialize (TimeSpan time, bool isShort = false)
{
CultureInfo cultureInfo = CultureInfo.CurrentCulture;
sepChar = cultureInfo.DateTimeFormat.TimeSeparator;
longFormat = $" hh\\{sepChar}mm\\{sepChar}ss";
shortFormat = $" hh\\{sepChar}mm";
this.isShort = isShort;
Time = time;
CursorPosition = 1;
TextChanged += TextField_TextChanged;
// Things this view knows how to do
AddCommand (Command.DeleteCharRight, () => { DeleteCharRight (); return true; });
AddCommand (Command.DeleteCharLeft, () => { DeleteCharLeft (); return true; });
AddCommand (Command.LeftHome, () => MoveHome ());
AddCommand (Command.Left, () => MoveLeft ());
AddCommand (Command.RightEnd, () => MoveEnd ());
AddCommand (Command.Right, () => MoveRight ());
// Default keybindings for this view
AddKeyBinding (Key.DeleteChar, Command.DeleteCharRight);
AddKeyBinding (Key.D | Key.CtrlMask, Command.DeleteCharRight);
AddKeyBinding (Key.Delete, Command.DeleteCharLeft);
AddKeyBinding (Key.Backspace, Command.DeleteCharLeft);
AddKeyBinding (Key.Home, Command.LeftHome);
AddKeyBinding (Key.A | Key.CtrlMask, Command.LeftHome);
AddKeyBinding (Key.CursorLeft, Command.Left);
AddKeyBinding (Key.B | Key.CtrlMask, Command.Left);
AddKeyBinding (Key.End, Command.RightEnd);
AddKeyBinding (Key.E | Key.CtrlMask, Command.RightEnd);
AddKeyBinding (Key.CursorRight, Command.Right);
AddKeyBinding (Key.F | Key.CtrlMask, Command.Right);
}
void TextField_TextChanged (ustring e)
{
try {
if (!TimeSpan.TryParseExact (Text.ToString ().Trim (), format.Trim (), CultureInfo.CurrentCulture, TimeSpanStyles.None, out TimeSpan result))
Text = e;
} catch (Exception) {
Text = e;
}
}
/// <summary>
/// Gets or sets the time of the <see cref="TimeField"/>.
/// </summary>
/// <remarks>
/// </remarks>
public TimeSpan Time {
get {
return time;
}
set {
if (ReadOnly)
return;
var oldTime = time;
time = value;
this.Text = " " + value.ToString (format.Trim ());
var args = new DateTimeEventArgs<TimeSpan> (oldTime, value, format);
if (oldTime != value) {
OnTimeChanged (args);
}
}
}
/// <summary>
/// Get or sets whether <see cref="TimeField"/> uses the short or long time format.
/// </summary>
public bool IsShortFormat {
get => isShort;
set {
isShort = value;
if (isShort)
Width = 7;
else
Width = 10;
var ro = ReadOnly;
if (ro)
ReadOnly = false;
SetText (Text);
ReadOnly = ro;
SetNeedsDisplay ();
}
}
/// <inheritdoc/>
public override int CursorPosition {
get => base.CursorPosition;
set {
base.CursorPosition = Math.Max (Math.Min (value, fieldLen), 1);
}
}
bool SetText (Rune key)
{
var text = TextModel.ToRunes (Text);
var newText = text.GetRange (0, CursorPosition);
newText.Add (key);
if (CursorPosition < fieldLen)
newText = newText.Concat (text.GetRange (CursorPosition + 1, text.Count - (CursorPosition + 1))).ToList ();
return SetText (ustring.Make (newText));
}
bool SetText (ustring text)
{
if (text.IsEmpty) {
return false;
}
ustring [] vals = text.Split (ustring.Make (sepChar));
bool isValidTime = true;
int hour = Int32.Parse (vals [0].ToString ());
int minute = Int32.Parse (vals [1].ToString ());
int second = isShort ? 0 : vals.Length > 2 ? Int32.Parse (vals [2].ToString ()) : 0;
if (hour < 0) {
isValidTime = false;
hour = 0;
vals [0] = "0";
} else if (hour > 23) {
isValidTime = false;
hour = 23;
vals [0] = "23";
}
if (minute < 0) {
isValidTime = false;
minute = 0;
vals [1] = "0";
} else if (minute > 59) {
isValidTime = false;
minute = 59;
vals [1] = "59";
}
if (second < 0) {
isValidTime = false;
second = 0;
vals [2] = "0";
} else if (second > 59) {
isValidTime = false;
second = 59;
vals [2] = "59";
}
string t = isShort ? $" {hour,2:00}{sepChar}{minute,2:00}" : $" {hour,2:00}{sepChar}{minute,2:00}{sepChar}{second,2:00}";
if (!TimeSpan.TryParseExact (t.Trim (), format.Trim (), CultureInfo.CurrentCulture, TimeSpanStyles.None, out TimeSpan result) ||
!isValidTime)
return false;
Time = result;
return true;
}
void IncCursorPosition ()
{
if (CursorPosition == fieldLen)
return;
if (Text [++CursorPosition] == sepChar.ToCharArray () [0])
CursorPosition++;
}
void DecCursorPosition ()
{
if (CursorPosition == 1)
return;
if (Text [--CursorPosition] == sepChar.ToCharArray () [0])
CursorPosition--;
}
void AdjCursorPosition ()
{
if (Text [CursorPosition] == sepChar.ToCharArray () [0])
CursorPosition++;
}
///<inheritdoc/>
public override bool ProcessKey (KeyEvent kb)
{
var result = InvokeKeybindings (kb);
if (result != null)
return (bool)result;
// Ignore non-numeric characters.
if (kb.Key < (Key)((int)Key.D0) || kb.Key > (Key)((int)Key.D9))
return false;
if (ReadOnly)
return true;
if (SetText (TextModel.ToRunes (ustring.Make ((uint)kb.Key)).First ()))
IncCursorPosition ();
return true;
}
bool MoveRight ()
{
IncCursorPosition ();
return true;
}
bool MoveEnd ()
{
CursorPosition = fieldLen;
return true;
}
bool MoveLeft ()
{
DecCursorPosition ();
return true;
}
bool MoveHome ()
{
// Home, C-A
CursorPosition = 1;
return true;
}
/// <inheritdoc/>
public override void DeleteCharLeft (bool useOldCursorPos = true)
{
if (ReadOnly)
return;
SetText ('0');
DecCursorPosition ();
return;
}
/// <inheritdoc/>
public override void DeleteCharRight ()
{
if (ReadOnly)
return;
SetText ('0');
return;
}
///<inheritdoc/>
public override bool MouseEvent (MouseEvent ev)
{
if (!ev.Flags.HasFlag (MouseFlags.Button1Clicked))
return false;
if (!HasFocus)
SetFocus ();
var point = ev.X;
if (point > fieldLen)
point = fieldLen;
if (point < 1)
point = 1;
CursorPosition = point;
AdjCursorPosition ();
return true;
}
/// <summary>
/// Event firing method that invokes the <see cref="TimeChanged"/> event.
/// </summary>
/// <param name="args">The event arguments</param>
public virtual void OnTimeChanged (DateTimeEventArgs<TimeSpan> args)
{
TimeChanged?.Invoke (args);
}
}
}