40 lines
1.3 KiB
C#
40 lines
1.3 KiB
C#
using CommunityToolkit.Mvvm.ComponentModel;
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using System.Text.RegularExpressions;
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namespace ColorPicker.ViewModels;
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public partial class ColorPickerViewModel : ObservableObject {
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[ObservableProperty]
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private byte red = 0, green = 0, blue = 0;
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[ObservableProperty]
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private string color = "#000000", hexInput = "#000000";
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public ColorPickerViewModel() {
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calculateColorFromRgb();
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}
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partial void OnRedChanged(byte value) => calculateColorFromRgb();
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partial void OnGreenChanged(byte value) => calculateColorFromRgb();
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partial void OnBlueChanged(byte value) => calculateColorFromRgb();
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partial void OnHexInputChanged(string value) {
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if (!Regex.IsMatch(value, @"^#[\dA-F]{6}$", RegexOptions.IgnoreCase))
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return;
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this.Color = HexInput;
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calculateRgbFromColor();
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}
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private void calculateRgbFromColor() {
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var parse = (int start, int length) => byte.Parse(this.Color.Substring(start, length), System.Globalization.NumberStyles.HexNumber);
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(this.Red, this.Green, this.Blue) = (parse(1, 2), parse(3, 2), parse(5, 2));
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}
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private void calculateColorFromRgb() {
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this.Color = $"#{this.Red:X2}{this.Green:X2}{this.Blue:X2}";
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this.HexInput = this.Color;
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}
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}
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