123 lines
3.7 KiB
C#
123 lines
3.7 KiB
C#
using Qrakhen.Qamp.Editor.Primitives;
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using Qrakhen.Qamp.Editor.ViewModel;
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using Qrakhen.Qamp.Memory;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Threading;
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namespace Qrakhen.Qamp.Editor.Controls;
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public partial class EditorFrame : UserControl
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{
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public Caret Caret { get; private set; }
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public EditorFrame()
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{
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InitializeComponent();
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Loaded += OnLoaded;
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PreviewKeyDown += OnKeyDown;
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}
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private void OnKeyDown(object sender, KeyEventArgs e)
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{
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if (DataContext is EditorFrameViewModel vm) {
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CursorPosition position = e.Key switch {
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Key.Right => new(0, 1),
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Key.Left => new(0, -1),
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Key.Up => new(-1, 0),
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Key.Down => new(1, 0),
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_ => new(0, 0)
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};
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if (position != CursorPosition.Void &&
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vm.MoveCaretCommand.CanExecute(position))
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{
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vm.MoveCaretCommand.Execute(position);
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} else {
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if (e.Key == Key.Back) {
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vm.Delete(1);
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} else {
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string c = e.Key.ToString();
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if (c.Length == 1) {
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vm.Insert(c);
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}
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}
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}
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e.Handled = true;
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}
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}
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private void OnLoaded(object sender, RoutedEventArgs e)
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{
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Focus();
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AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
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if (adornerLayer != null) {
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Caret = new Caret(this, Brushes.LimeGreen);
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adornerLayer.Add(Caret);
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} else {
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System.Diagnostics.Debug.WriteLine("AdornerLayer still null. Check parent hierarchy.");
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}
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Loaded -= OnLoaded;
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}
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private Point CalculateCaretPosition(int line, int index, double scrollY, double scrollX)
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{
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var ft = TextHelper.GetText(new string('_', index), 14, null, VisualTreeHelper.GetDpi(this).PixelsPerDip);
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return new Point(ft.Width + scrollX + 2, line * TextHelper.LineHeight + scrollY);
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}
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private void MoveCaret(Point point)
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{
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Caret?.UpdatePosition(point);
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}
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private void UpdateCaret()
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{
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int line = CursorPosition.Line;
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int charIndex = CursorPosition.Column;
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double scrollY = ScrollView.VerticalOffset;
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double scrollX = ScrollView.HorizontalOffset;
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MoveCaret(
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CalculateCaretPosition(
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line,
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charIndex,
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scrollY,
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scrollX));
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}
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public LineBuffer CurrentLineBuffer {
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get => (LineBuffer)GetValue(CurrentLineBufferProperty);
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set => SetValue(CurrentLineBufferProperty, value);
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}
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public static readonly DependencyProperty CurrentLineBufferProperty =
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DependencyProperty.Register(
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nameof(CurrentLineBuffer),
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typeof(LineBuffer),
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typeof(EditorFrame),
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new PropertyMetadata(null));
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public CursorPosition CursorPosition {
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get => (CursorPosition)GetValue(CursorPositionProperty);
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set => SetValue(CursorPositionProperty, value);
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}
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public static readonly DependencyProperty CursorPositionProperty =
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DependencyProperty.Register(
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nameof(CursorPosition),
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typeof(CursorPosition),
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typeof(EditorFrame),
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new PropertyMetadata(CursorPosition.Void, OnCursorPositionChanged));
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private static void OnCursorPositionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var frame = (EditorFrame)d;
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frame.UpdateCaret();
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}
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}
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