ContentColorPicker WIP

2024-10-09 11:59:23 +01:00
parent a87553fe23
commit f10d028558
3 changed files with 107 additions and 4 deletions
@@ -0,0 +1,73 @@
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Input;
+
+namespace Toolkit.UI.Controls.Avalonia;
+
+public class ContentColorPicker : ContentControl
+{
+    private Canvas? canvas;
+    private Border? preview;
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs args)
+    {
+        base.OnApplyTemplate(args);
+
+        canvas = args.NameScope.Find<Canvas>("Canvas");
+
+        if (canvas is not null)
+        {
+            canvas.PointerMoved += OnPointerMoved;
+            canvas.PointerExited += OnPointerExited;
+            canvas.PointerEntered += OnPointerEntered;
+        }
+
+        preview = args.NameScope.Find<Border>("Preview");
+    }
+
+    private void OnPointerMoved(object? sender, 
+        PointerEventArgs args)
+    {
+        if (canvas is null || preview is null)
+        {
+            return;
+        }
+
+        double relativeX = args.GetPosition(canvas).X;
+        double relativeY = args.GetPosition(canvas).Y;
+
+        double newX = relativeX < 0 ? 0 : (relativeX > canvas.Bounds.Width ? canvas.Bounds.Width : relativeX);
+        double newY = relativeY < 0 ? 0 : (relativeY > canvas.Bounds.Height ? canvas.Bounds.Height : relativeY);
+
+        if (newX < 0 || newX > canvas.Bounds.Width || newY < 0 || newY > canvas.Bounds.Height)
+        {
+            preview.IsVisible = false;
+            return;
+        }
+
+        Canvas.SetLeft(preview, newX);
+        Canvas.SetTop(preview, newY);
+    }
+
+    private void OnPointerEntered(object? sender, 
+        PointerEventArgs args)
+    {
+        if (preview is null)
+        {
+            return;
+        }
+
+        preview.IsVisible = true;
+    }
+
+    private void OnPointerExited(object? sender, 
+        PointerEventArgs args)
+    {
+        if (preview is null)
+        {
+            return;
+        }
+
+        preview.IsVisible = false;
+    }
+}