Xin chào các bạn, bài viết hôm nay mình tiếp tục hướng dẫn các bạn thay đổi giao diện ứng dụng Winform realtime theo Theme của Windows trên C#.

[C#] How to trigger change theme windows to my application

Dưới đây là hình ảnh ứng dụng:

Ở hình trên, các bạn thấy khi mình chọn giao diện: Dark/ Light hoặc thay đổi màu Theme Accent thì form ứng dụng của mình cũng thay đổi theo.

Video demo ứng dụng:

Đầu tiên, các bạn tạo 1 class WinTheme.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace GetThemeColorWindows
{
    public class WinTheme
    {
        [DllImport("uxtheme.dll", EntryPoint = "#95")]
        private static extern uint GetImmersiveColorFromColorSetEx(uint dwImmersiveColorSet, uint dwImmersiveColorType,
                                                               bool bIgnoreHighContrast, uint dwHighContrastCacheMode);
        [DllImport("uxtheme.dll", EntryPoint = "#96")]
        private static extern uint GetImmersiveColorTypeFromName(IntPtr pName);
        [DllImport("uxtheme.dll", EntryPoint = "#98")]
        private static extern int GetImmersiveUserColorSetPreference(bool bForceCheckRegistry, bool bSkipCheckOnFail);
    
        public static Color GetAccentColor()
        {
            var userColorSet = GetImmersiveUserColorSetPreference(false, false);
            var colorType = GetImmersiveColorTypeFromName(Marshal.StringToHGlobalUni("ImmersiveStartSelectionBackground"));
            var colorSetEx = GetImmersiveColorFromColorSetEx((uint)userColorSet, colorType, false, 0);
            return ConvertDWordColorToRGB(colorSetEx);
        }
      
        private static Color ConvertDWordColorToRGB(uint colorSetEx)
        {
            byte redColor = (byte)((0x000000FF & colorSetEx) >> 0);
            byte greenColor = (byte)((0x0000FF00 & colorSetEx) >> 8);
            byte blueColor = (byte)((0x00FF0000 & colorSetEx) >> 16);           
            return Color.FromArgb(redColor, greenColor, blueColor);
        }
    }
}

Tiếp đến, code cho hàm Form1.cs

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GetThemeColorWindows
{
    public partial class Form1 : Form
    {
        private UserPreferenceChangedEventHandler UserPreferenceChanged;
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }

       

        public Form1()
        {
            InitializeComponent();
            LoadTheme();
            UserPreferenceChanged = new UserPreferenceChangedEventHandler(SystemEvents_UserPreferenceChanged);
            SystemEvents.UserPreferenceChanged += UserPreferenceChanged;
            this.Disposed += new EventHandler(Form_Disposed);
            panel1.MouseDown += Form1_MouseDown;
        }

        public bool IsDarkTheme() {
            bool is_light_mode = true;
            try
            {
                var v = Microsoft.Win32.Registry.GetValue(@"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize", "AppsUseLightTheme", "1");
                if (v != null && v.ToString() == "0")
                    is_light_mode = false;
            }
            catch { }
            return is_light_mode;
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void Form_Disposed(object sender, EventArgs e)
        {
            SystemEvents.UserPreferenceChanged -= UserPreferenceChanged;
        }

        private void LoadTheme()
        {
            var themeColor = WinTheme.GetAccentColor();//Windows Accent Color
            var lightColor = ControlPaint.Light(themeColor);
            var darkColor = ControlPaint.Dark(themeColor);
            var isDarkorLight = IsDarkTheme();
            if (isDarkorLight)
            {
                //light
                this.BackColor = SystemColors.Control;
                label1.ForeColor = Color.Black;
                label2.ForeColor = Color.Black;
            }
            else {
                //dark
                this.BackColor = ColorTranslator.FromHtml("#24292E");
                label1.ForeColor = Color.White;
                label2.ForeColor = Color.White;
            }
            panel1.BackColor = themeColor;
            panel2.BackColor = themeColor;
  
            //Buttons
            foreach (Button button in this.Controls.OfType<Button>())
            {
                button.BackColor = themeColor;
                button.ForeColor = this.BackColor;
            }

            foreach (Label label in this.Controls.OfType<Label>())
            {
                label.ForeColor = this.BackColor;
            }

        }
        private void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
        {
            if (e.Category == UserPreferenceCategory.General || e.Category == UserPreferenceCategory.VisualStyle)
            {
                LoadTheme();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

Thanks for watching!

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