public static void BindDisplay(this MathKeyboard keyboard,
SKCanvasView view, MathPainter settings, SKColor caretColor,
CaretShape caretShape = CaretShape.IBeam, SKStrokeCap cap = SKStrokeCap.Butt)
{
view.EnableTouchEvents = true;
view.Touch +=
(sender, e) => {
if (e.ActionType == SKTouchAction.Pressed)
{
keyboard.MoveCaretToPoint(new System.Drawing.PointF(e.Location.X, e.Location.Y));
}
};
keyboard.RedrawRequested += (_, __) => view.InvalidateSurface();
view.PaintSurface +=
(sender, e) => {
var c = e.Surface.Canvas;
c.Clear();
MathPainter.DrawDisplay(settings, keyboard.Display, c);
keyboard.DrawCaret(new SkiaCanvas(c, cap, AntiAlias.Enable), caretColor.FromNative(), caretShape);
};
}
public MainPage()
{
// Basic functionality
var view = new SKCanvasView {
HeightRequest = 225
};
var keyboard = new MathKeyboard();
var viewModel =
(Rendering.MathKeyboard) typeof(MathKeyboard)
.GetField("Keyboard", BindingFlags.NonPublic | BindingFlags.Instance)
.GetValue(keyboard);
view.EnableTouchEvents = true;
view.Touch +=
(sender, e) => {
if (e.ActionType == SKTouchAction.Pressed)
{
viewModel.MoveCaretToPoint
(new System.Drawing.PointF(e.Location.X, e.Location.Y));
}
};
keyboard.RedrawRequested += (_, __) => view.InvalidateSurface();
view.PaintSurface +=
(sender, e) => {
var c = e.Surface.Canvas;
c.Clear();
MathPainter.DrawDisplay(new MathPainter {
TextColor = SKColors.Black
},
keyboard.Display, c);
keyboard.DrawCaret(c, CaretShape.IBeam);
};
// Input from physical keyboard
var entry = new Entry {
Placeholder = "Enter keystrokes..."
};
entry.TextChanged += (sender, e) => {
entry.Text = "";
foreach (var c in e.NewTextValue)
{
viewModel.KeyPress((Editor.MathKeyboardInput)c);
}
};
// Debug labels
var latex = new Label {
Text = "LaTeX = "
};
var ranges = new Label {
Text = "Ranges = "
};
var index = new Label {
Text = "Index = "
};
viewModel.RedrawRequested += (sender, e) => {
latex.Text = "LaTeX = " + viewModel.LaTeX;
ranges.Text = "Ranges = " + string.Join(", ",
((ListDisplay <Fonts, Glyph>)viewModel.Display).Displays.Select(x => x.Range));
index.Text = "Index = " + viewModel.InsertionIndex;
};
// Assemble
Content = new StackLayout
{
Children = { latex, ranges, index, view, keyboard, entry }
};
}