private FrButton(Cell <string> label, StreamLoop <Unit> sClicked)
: base((size, sMouse, sKey, focus, idSupply) =>
{
Stream <Unit> sPressed = sMouse.Snapshot(size,
(e, mSize) => mSize.Match(
s =>
{
MouseButtonEventArgs b = e.Args as MouseButtonEventArgs;
Point p = e.GetPosition();
return(b != null && b.ChangedButton == MouseButton.Left && b.ButtonState == MouseButtonState.Pressed &&
p.X >= 2 && p.X < s.Width - 2 && p.Y >= 2 && p.Y < s.Height - 2
? Maybe.Just(Unit.Value)
: Maybe.Nothing <Unit>());
},
Maybe.Nothing <Unit>)).FilterMaybe();
Stream <Unit> sReleased = sMouse.Snapshot(size,
(e, mSize) => mSize.Match(
s =>
{
MouseButtonEventArgs b = e.Args as MouseButtonEventArgs;
return(b != null && b.ChangedButton == MouseButton.Left && b.ButtonState == MouseButtonState.Released
? Maybe.Just(Unit.Value)
: Maybe.Nothing <Unit>());
},
Maybe.Nothing <Unit>)).FilterMaybe();
Cell <bool> pressed = sPressed.Map(_ => true).OrElse(sReleased.Map(_ => false)).Hold(false);
sClicked.Loop(sReleased.Gate(pressed));
Typeface typeface = new Typeface(new FontFamily("Helvetica"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
Cell <Size> desiredSize = label.Map(l =>
{
Size labelSize = FontUtilities.MeasureString(l, typeface, 13);
return(new Size(labelSize.Width + 14, labelSize.Height + 10));
});
return(new Output(
label.Lift(
size, pressed,
(l, mSize, p) => new DrawableDelegate(d =>
{
mSize.Match(sz =>
{
d.DrawRectangle(p ? Brushes.DarkGray : Brushes.LightGray, new Pen(Brushes.Black, 1), new Rect(new Point(2, 2), new Size(sz.Width - 5, sz.Height - 5)));
FormattedText t = FontUtilities.GetStandardFormattedText(l, typeface, 13, Brushes.Black);
d.DrawText(t, new Point((sz.Width - t.Width) / 2, (sz.Height - t.Height) / 2));
}, () => { });
})),
desiredSize,
Stream.Never <long>()));
})
{
this.SClicked = sClicked;
}
private FrTextField(string initText, CellLoop <string> text)
: base((size, sMouse, sKey, focus, idSupply) =>
{
Stream <double> sPressed = sMouse.Snapshot(size, (e, mSize) =>
mSize.Match(
s =>
{
MouseButtonEventArgs b = e.Args as MouseButtonEventArgs;
Point p = e.GetPosition();
return(b != null && b.ChangedButton == MouseButton.Left && b.ButtonState == MouseButtonState.Pressed &&
p.X >= 2 && p.X < s.Width - 2 && p.Y >= 2 && p.Y < s.Height - 2
? Maybe.Just(p.X - 2)
: Maybe.Nothing <double>());
},
Maybe.Nothing <double>)).FilterMaybe();
CellLoop <int> x = new CellLoop <int>();
long myId = idSupply.Get();
Cell <bool> haveFocus = focus.Map(fId => fId == myId);
Typeface typeface = new Typeface(new FontFamily("Helvetica"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
Stream <TextUpdate> sTextUpdate = sKey.Gate(haveFocus).Snapshot(text, (key, txt) =>
{
int xValue = x.Sample();
if (key is BackspaceKeyEvent)
{
return(xValue > 0 ? Maybe.Just(new TextUpdate(
txt.Substring(0, xValue - 1) +
txt.Substring(xValue),
xValue - 1)) : Maybe.Nothing <TextUpdate>());
}
StringKeyEvent stringKey = key as StringKeyEvent;
if (stringKey == null)
{
throw new InvalidOperationException("Unexpected type encountered for " + typeof(KeyEvent).FullName + ": " + key.GetType().FullName + ".");
}
string keyString = stringKey.String;
return(keyString == "\b" ? Maybe.Nothing <TextUpdate>() :
Maybe.Just(new TextUpdate(
txt.Substring(0, xValue) +
keyString +
txt.Substring(xValue),
xValue + 1)));
}).FilterMaybe();
x.Loop(sPressed.Snapshot(text,
(xCoord, txt) =>
{
for (int i = 1; i <= txt.Length; i++)
{
if (xCoord < FontUtilities.MeasureString(txt.Substring(0, i), typeface, 13).Width)
{
return(i - 1);
}
}
return(txt.Length);
})
.OrElse(sTextUpdate.Map(tu => tu.NewX))
.Hold(0));
text.Loop(sTextUpdate.Map(tu => tu.Txt).Hold(initText));
Cell <Size> desiredSize = text.Map(txt =>
{
Size s = FontUtilities.MeasureString(txt, typeface, 13);
return(new Size(s.Width + 14, s.Height + 10));
});
return(new Output(
text.Lift(
x, haveFocus, size,
(txt, xValue, haveFocusValue, mSize) => new DrawableDelegate(d =>
{
mSize.Match(
sz =>
{
d.DrawRectangle(Brushes.White, new Pen(Brushes.Black, 1), new Rect(new Point(2, 2), new Size(sz.Width - 5, sz.Height - 5)));
FormattedText t = FontUtilities.GetStandardFormattedText(txt, typeface, 13, Brushes.Black);
FormattedText tCursor = FontUtilities.GetStandardFormattedText(txt.Substring(0, xValue), typeface, 13, Brushes.Black);
d.DrawText(t, new Point(4, (sz.Height - t.Height) / 2));
if (haveFocusValue)
{
double cursorX = tCursor.Width;
d.DrawLine(new Pen(Brushes.Red, 1), new Point(4 + cursorX, 4), new Point(4 + cursorX, sz.Height - 5));
}
},
() => { });
})),
desiredSize,
sPressed.Map(_ => myId)));
})
{
this.Text = text;
}