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editor caret works! (i should focus on the language, shouldnt i?)

This commit is contained in:
Qrakhen 2025-11-19 20:47:03 +01:00
parent c2f9b93b46
commit 7d9e81c60f
11 changed files with 284 additions and 48 deletions
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2
Qrakhen.Qamp.Editor/App.xaml.cs
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@ -11,7 +11,7 @@ public partial class App : Application
protected override void OnStartup(StartupEventArgs e)
{
MainWindow window = new MainWindow() {
DataContext = new ViewModel.FileViewModel()
DataContext = new ViewModel.EditorFrameViewModel()
};
window.Show();

30
Qrakhen.Qamp.Editor/Commands/RelayCommand.cs Normal file
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@ -0,0 +1,30 @@
using System.Windows.Input;
namespace Qrakhen.Qamp.Editor.Commands;
public class RelayCommand : ICommand
{
private readonly Action<object?> _execute;
private readonly Func<object?, bool> _canExecute;
public RelayCommand(Action<object?> execute) : this(execute, null) { }
public RelayCommand(Action<object?> execute, Func<object?, bool>? canExecute)
{
_execute = execute ?? throw new ArgumentNullException(nameof(execute));
_canExecute = canExecute ?? (p => true);
}
public RelayCommand(Action execute) : this(p => execute()) { }
public RelayCommand(Action execute, Func<bool> canExecute) : this(p => execute(), p => canExecute()) { }
public event EventHandler? CanExecuteChanged {
add => CommandManager.RequerySuggested += value;
remove => CommandManager.RequerySuggested -= value;
}
public bool CanExecute(object? parameter) => _canExecute(parameter);
public void Execute(object? parameter) => _execute(parameter);
}

35
Qrakhen.Qamp.Editor/Controls/Caret.cs Normal file
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@ -0,0 +1,35 @@
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
namespace Qrakhen.Qamp.Editor.Controls;
public class Caret : Adorner
{
private readonly Pen _caretPen;
private readonly double _lineHeight;
private Point _cursorPosition;
public Caret(UIElement adornedElement, double lineHeight) : base(adornedElement)
{
_lineHeight = lineHeight;
_caretPen = new Pen(Brushes.LimeGreen, 1.5);
IsHitTestVisible = false;
}
public void UpdatePosition(Point newPosition)
{
_cursorPosition = newPosition;
InvalidateVisual();
}
protected override void OnRender(DrawingContext drawingContext)
{
Point startPoint = new(_cursorPosition.X, _cursorPosition.Y);
Point endPoint = new(_cursorPosition.X, _cursorPosition.Y + _lineHeight);
drawingContext.DrawLine(_caretPen, startPoint, endPoint);
}
}

12
Qrakhen.Qamp.Editor/Controls/EditorFrame.xaml
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@ -6,9 +6,17 @@
xmlns:local="clr-namespace:Qrakhen.Qamp.Editor.Controls"
mc:Ignorable="d"
Background="#161718"
Focusable="True"
d:DesignHeight="450" d:DesignWidth="800">
<ScrollViewer VerticalScrollBarVisibility="Auto"
<UserControl.Style>
<Style TargetType="{x:Type local:EditorFrame}">
<Setter Property="CursorPosition" Value="{Binding CursorPosition}" />
</Style>
</UserControl.Style>
<ScrollViewer x:Name="ScrollView"
VerticalScrollBarVisibility="Auto"
HorizontalScrollBarVisibility="Auto">
<ItemsControl ItemsSource="{Binding Lines}">

88
Qrakhen.Qamp.Editor/Controls/EditorFrame.xaml.cs
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@ -1,22 +1,94 @@
using System;
using System.Collections.Generic;
using System.Text;
using Qrakhen.Qamp.Editor.Primitives;
using Qrakhen.Qamp.Editor.ViewModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace Qrakhen.Qamp.Editor.Controls;
public partial class EditorFrame : UserControl
{
public Caret Caret { get; private set; }
public EditorFrame()
{
InitializeComponent();
Loaded += OnLoaded;
PreviewKeyDown += OnKeyDown;
}
private void OnKeyDown(object sender, KeyEventArgs e)
{
if (DataContext is EditorFrameViewModel vm) {
CursorPosition position = e.Key switch {
Key.Right => new(0, 1),
Key.Left => new(0, -1),
Key.Up => new(-1, 0),
Key.Down => new(1, 0),
_ => new(0, 0)
};
if (vm.MoveCaretCommand.CanExecute(position)) {
vm.MoveCaretCommand.Execute(position);
e.Handled = true;
}
}
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
Focus();
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null) {
Caret = new Caret(this, 18);
adornerLayer.Add(Caret);
} else {
System.Diagnostics.Debug.WriteLine("AdornerLayer still null. Check parent hierarchy.");
}
Loaded -= OnLoaded;
}
private Point CalculateCaretPosition(int line, int index, double scrollY, double scrollX)
{
return new Point(10 * index + scrollX, line * 18 + scrollY);
}
private void MoveCaret(Point point)
{
Caret?.UpdatePosition(point);
}
private void UpdateCaret()
{
int line = CursorPosition.Line;
int charIndex = CursorPosition.Column;
double scrollY = ScrollView.VerticalOffset;
double scrollX = ScrollView.HorizontalOffset;
MoveCaret(
CalculateCaretPosition(
line,
charIndex,
scrollY,
scrollX));
}
public CursorPosition CursorPosition {
get => (CursorPosition)GetValue(CursorPositionProperty);
set => SetValue(CursorPositionProperty, value);
}
public static readonly DependencyProperty CursorPositionProperty =
DependencyProperty.Register(
nameof(CursorPosition),
typeof(CursorPosition),
typeof(EditorFrame),
new PropertyMetadata(CursorPosition.Void, OnCursorPositionChanged));
private static void OnCursorPositionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var frame = (EditorFrame)d;
frame.UpdateCaret();
}
}

2
Qrakhen.Qamp.Editor/Controls/LineRenderer.xaml
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@ -5,7 +5,7 @@
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Qrakhen.Qamp.Editor.Controls"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
d:DesignHeight="18" d:DesignWidth="420">
<Grid>
</Grid>

22
Qrakhen.Qamp.Editor/Primitives/CursorPosition.cs Normal file
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@ -0,0 +1,22 @@
namespace Qrakhen.Qamp.Editor.Primitives;
public record struct CursorPosition(int line = 0, int column = 0)
{
public static readonly CursorPosition Void = new(0, 0);
public static readonly CursorPosition Left = new(0, -1);
public static readonly CursorPosition Right = new(0, 1);
public static readonly CursorPosition Up = new(-1, 0);
public static readonly CursorPosition Down = new(1, 0);
public int Line = line < 0 ? 0 : line;
public int Column = column < 0 ? 0 : column;
public static CursorPosition operator +(CursorPosition left, CursorPosition right)
=> new(left.Line + right.Line, left.Column + right.Column);
public static CursorPosition operator -(CursorPosition left, CursorPosition right)
=> new(left.Line - right.Line, left.Column - right.Column);
public static CursorPosition operator *(CursorPosition left, int factor)
=> new(left.Line * factor, left.Column * factor);
}

7
Qrakhen.Qamp.Editor/Primitives/CursorRegion.cs Normal file
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@ -0,0 +1,7 @@
namespace Qrakhen.Qamp.Editor.Primitives;
public struct CursorRegion(CursorPosition from, CursorPosition to)
{
public CursorPosition From = from;
public CursorPosition To = to;
}

72
Qrakhen.Qamp.Editor/ViewModel/EditorFrameViewModel.cs Normal file
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@ -0,0 +1,72 @@
using Qrakhen.Qamp.Editor.Commands;
using Qrakhen.Qamp.Editor.Primitives;
using Qrakhen.Qamp.Memory;
using System.Collections.ObjectModel;
using System.Windows.Input;
namespace Qrakhen.Qamp.Editor.ViewModel;
public class EditorFrameViewModel : ObservableObject
{
private CursorPosition _cursorPosition;
public CursorPosition CursorPosition {
get => _cursorPosition;
set => SetProperty(ref _cursorPosition, value);
}
public int CursorLine {
get => _cursorPosition.Line;
set => SetProperty(ref _cursorPosition.Line, value);
}
public int CursorColumn {
get => _cursorPosition.Column;
set => SetProperty(ref _cursorPosition.Column, value);
}
public LineBuffer CurrentLineBuffer => Lines[CursorLine];
public ICommand MoveCaretCommand { get; }
public ObservableCollection<LineBuffer> Lines { get; private set; } = new() {
new LineBuffer("test"),
new LineBuffer(" is very good;"),
new LineBuffer(" jaja();"),
new LineBuffer("}")
};
public EditorFrameViewModel()
{
MoveCaretCommand = new RelayCommand(ExecuteMoveCaret, CanMoveCaret);
}
public void SetCursor(int line, int column)
{
line = line < 0 ? 0 : line >= Lines.Count ? Lines.Count - 1 : line;
LineBuffer buffer = Lines[line];
column = column < 0 ? 0 : column > buffer.Tail ? buffer.Tail : column;
CursorPosition = new(line, column);
}
public void MoveCursor(int lines, int columns)
{
SetCursor(CursorLine + lines, CursorColumn + columns);
}
public bool CanMoveCaret(object? relativeUpdate)
{
return true;
}
public void ExecuteMoveCaret(object? relativeUpdate)
{
if (relativeUpdate is CursorPosition pos)
MoveCursor(pos.Line, pos.Column);
}
public void Insert(string data)
{
CurrentLineBuffer.Insert(CursorColumn, data);
OnPropertyChanged(nameof(Lines));
}
}

37
Qrakhen.Qamp.Editor/ViewModel/MainViewModel.cs
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@ -1,10 +1,5 @@
using Qrakhen.Qamp.Memory;
using System;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Text;
namespace Qrakhen.Qamp.Editor.ViewModel;
@ -13,33 +8,3 @@ public class MainViewModel
{
}
public class FileViewModel : ObservableObject
{
public ObservableCollection<LineBuffer> Lines { get; private set; } = new() {
new LineBuffer("test"),
new LineBuffer(" is very good;"),
new LineBuffer(" jaja();"),
new LineBuffer("}")
};
}
public abstract class ObservableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler? PropertyChanged;
protected bool SetProperty<T>([NotNullIfNotNull("newValue")] ref T field, T newValue, [CallerMemberName] string? propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, newValue))
return false;
field = newValue;
OnPropertyChanged(propertyName);
return true;
}
protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}

25
Qrakhen.Qamp.Editor/ViewModel/ObservableObject.cs Normal file
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@ -0,0 +1,25 @@
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
namespace Qrakhen.Qamp.Editor.ViewModel;
public abstract class ObservableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler? PropertyChanged;
protected bool SetProperty<T>([NotNullIfNotNull("newValue")] ref T field, T newValue, [CallerMemberName] string? propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, newValue))
return false;
field = newValue;
OnPropertyChanged(propertyName);
return true;
}
protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}