[#37] Controls: Implement IntegerUpDown

2024-06-03 16:59:45 +02:00
parent ff375e3caf
commit cc4ec6c5db
7 changed files with 170 additions and 10 deletions
--- a/Elwig/Controls/IntegerUpDown.cs
+++ b/Elwig/Controls/IntegerUpDown.cs
@ -0,0 +1,106 @@
+using System;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+
+namespace Elwig.Controls {
+    public class IntegerUpDown : TextBox {
+
+        public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Miminum", typeof(int?), typeof(IntegerUpDown), new FrameworkPropertyMetadata(null));
+        public int? Minimum {
+            get => (int?)GetValue(MinimumProperty);
+            set => SetValue(MinimumProperty, value);
+        }
+
+        public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(int?), typeof(IntegerUpDown), new FrameworkPropertyMetadata(null));
+        public int? Maximum {
+            get => (int?)GetValue(MaximumProperty);
+            set => SetValue(MaximumProperty, value);
+        }
+
+        public int? Value {
+            get => int.TryParse(Text, out var res) ? res : null;
+            set => Text = $"{value}";
+        }
+
+        static IntegerUpDown() {
+            DefaultStyleKeyProperty.OverrideMetadata(typeof(IntegerUpDown), new FrameworkPropertyMetadata(typeof(IntegerUpDown)));
+        }
+
+        public IntegerUpDown() {
+            TextChanged += IntegerUpDown_TextChanged;
+            LostFocus += IntegerUpDown_LostFocus;
+            KeyUp += IntegerUpDown_KeyUp;
+        }
+
+        public override void OnApplyTemplate() {
+            var incButton = GetTemplateChild("IncrementButton") as RepeatButton;
+            var decButton = GetTemplateChild("DecrementButton") as RepeatButton;
+            incButton!.Click += IncrementButton_Click;
+            decButton!.Click += DecrementButton_Click;
+            base.OnApplyTemplate();
+        }
+
+        private void IntegerUpDown_TextChanged(object sender, TextChangedEventArgs evt) {
+            var idx = CaretIndex;
+            Text = new string(Text.Where(char.IsAsciiDigit).Take(4).ToArray());
+            CaretIndex = idx;
+            evt.Handled = !(Value >= Minimum && Value <= Maximum);
+            if (idx >= 4) {
+                if (Value < Minimum) {
+                    Value = Minimum;
+                } else if (Value > Maximum) {
+                    Value = Maximum;
+                }
+                CaretIndex = 4;
+            }
+        }
+
+        private void IntegerUpDown_LostFocus(object sender, RoutedEventArgs evt) {
+            if (Value < Minimum) {
+                Value = Minimum;
+            } else if (Value > Maximum) {
+                Value = Maximum;
+            }
+        }
+
+        private void IncrementButton_Click(object sender, RoutedEventArgs evt) {
+            Value = Math.Min((Value ?? 0) + 1, Maximum ?? int.MaxValue);
+        }
+
+        private void DecrementButton_Click(object sender, RoutedEventArgs evt) {
+            Value = Math.Max((Value ?? 0) - 1, Minimum ?? int.MinValue);
+        }
+
+        private void IntegerUpDown_KeyUp(object sender, KeyEventArgs evt) {
+            switch (evt.Key) {
+                case Key.Up:
+                case Key.Add:
+                case Key.OemPlus:
+                    Value = Math.Min((Value ?? 0) + 1, Maximum ?? int.MaxValue);
+                    evt.Handled = true;
+                    CaretIndex = 4;
+                    break;
+                case Key.Down:
+                case Key.Subtract:
+                case Key.OemMinus:
+                    Value = Math.Max((Value ?? 0) - 1, Minimum ?? int.MinValue);
+                    evt.Handled = true;
+                    CaretIndex = 4;
+                    break;
+                case Key.PageUp:
+                    Value = Math.Min((Value ?? 0) + 10, Maximum ?? int.MaxValue);
+                    evt.Handled = true;
+                    CaretIndex = 4;
+                    break;
+                case Key.PageDown:
+                    Value = Math.Max((Value ?? 0) - 10, Minimum ?? int.MinValue);
+                    evt.Handled = true;
+                    CaretIndex = 4;
+                    break;
+            }
+        }
+    }
+}