Dark mode WIP

- The start of a dark mode theme
- Adds a button to toggle dark mode in the top options panel. (The buttons kind of ugly though and I may change this to a checkbox to align with the other existing options)
- Added library uxtheme.dll for handling scrollbar themeing (Dealing with scrollbars sucks)
- Added ThemeManager for handling of theme colors (Allows for potential expandability I'll probably never implement)

CreamInstaller/Components/CustomForm.cs

@@ -42,6 +42,18 @@ internal class CustomForm : Form
         }
     }
 
+    protected override void OnHandleCreated(EventArgs e)
+    {
+        base.OnHandleCreated(e);
+        ThemeManager.Apply(this); // apply current theme (initial or toggled)
+    }
+
+    protected override void OnShown(EventArgs e)
+    {
+        base.OnShown(e);
+        ThemeManager.Apply(this); // ensure late-added controls also themed
+    }
+
     private void OnHelpButtonClicked(object sender, EventArgs args)
     {
         using DialogForm helpDialog = new(this);

CreamInstaller/Forms/SelectForm.Designer.cs

@@ -46,6 +46,7 @@ namespace CreamInstaller.Forms
             saveFlowPanel = new FlowLayoutPanel();
             selectionTreeView = new CustomTreeView();
             topOptionsTable = new TableLayoutPanel();
+            darkModeButton = new Button();
             programsGroupBox.SuspendLayout();
             proxyFlowPanel.SuspendLayout();
             blockedGamesFlowPanel.SuspendLayout();
@@ -248,6 +249,19 @@ namespace CreamInstaller.Forms
             selectionTreeView.Size = new System.Drawing.Size(604, 230);
             selectionTreeView.TabIndex = 1001;
             // 
+            // darkModeButton
+            // 
+            darkModeButton.AutoSize = true;
+            darkModeButton.AutoSizeMode = AutoSizeMode.GrowAndShrink;
+            darkModeButton.Location = new System.Drawing.Point(0, 0);
+            darkModeButton.Margin = new Padding(12, 0, 0, 0);
+            darkModeButton.Name = "darkModeButton";
+            darkModeButton.Size = new System.Drawing.Size(73, 25);
+            darkModeButton.TabIndex = 10010;
+            darkModeButton.Text = "Dark Mode";
+            darkModeButton.UseVisualStyleBackColor = true;
+            darkModeButton.Click += OnDarkModeToggle;
+            // 
             // progressBar
             // 
             progressBar.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
@@ -391,7 +405,8 @@ namespace CreamInstaller.Forms
             topOptionsTable.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;
             topOptionsTable.AutoSize = true;
             topOptionsTable.AutoSizeMode = AutoSizeMode.GrowAndShrink;
-            topOptionsTable.ColumnCount = 5;
+            topOptionsTable.ColumnCount = 6;
+            topOptionsTable.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
             topOptionsTable.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
             topOptionsTable.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
             topOptionsTable.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F)); // spacer
@@ -406,8 +421,9 @@ namespace CreamInstaller.Forms
             topOptionsTable.TabIndex = 10009;
             topOptionsTable.Controls.Add(blockedGamesFlowPanel, 0, 0);
             topOptionsTable.Controls.Add(useSmokeAPILayoutPanel, 1, 0);
-            topOptionsTable.Controls.Add(proxyFlowPanel, 3, 0);
-            topOptionsTable.Controls.Add(allCheckBoxLayoutPanel, 4, 0);
+            topOptionsTable.Controls.Add(darkModeButton, 2, 0);
+            topOptionsTable.Controls.Add(proxyFlowPanel, 4, 0);
+            topOptionsTable.Controls.Add(allCheckBoxLayoutPanel, 5, 0);
             // 
             // SelectForm
             // 
@@ -479,6 +495,7 @@ namespace CreamInstaller.Forms
         private Button resetButton;
         private FlowLayoutPanel saveFlowPanel;
         private TableLayoutPanel topOptionsTable;
+        private Button darkModeButton;
     }
 }
 

CreamInstaller/Forms/SelectForm.cs

@@ -1239,4 +1239,16 @@ internal sealed partial class SelectForm : CustomForm
     {
 
     }
+
+    private void OnDarkModeToggle(object sender, EventArgs e)
+    {
+        ThemeManager.ToggleDarkMode(this);
+        darkModeButton.Text = Program.DarkModeEnabled ? "Light Mode" : "Dark Mode";
+    }
+
+    protected override void OnShown(EventArgs e)
+    {
+        base.OnShown(e);
+        ThemeManager.Apply(this); // ensure controls after dynamic operations get themed
+    }
 }

CreamInstaller/Forms/UpdateForm.cs

@@ -40,6 +40,7 @@ internal sealed partial class UpdateForm : CustomForm
 #if DEBUG
         DebugForm.Current.Attach(form);
 #endif
+        ThemeManager.Apply(form); // apply current theme when transitioning
     }
 
     private async void OnLoad()

CreamInstaller/Program.cs

@@ -43,6 +43,9 @@ internal static class Program
     internal static readonly string[] ProtectedGameDirectories = [@"\EasyAntiCheat", @"\BattlEye"];
     internal static readonly string[] ProtectedGameDirectoryExceptions = [];
 
+    // Dark mode toggle (default false). Can be toggled via UI button.
+    internal static bool DarkModeEnabled;
+
     internal static bool IsGameBlocked(string name, string directory = null)
         => BlockProtectedGames && (ProtectedGames.Contains(name) || directory is not null &&
             !ProtectedGameDirectoryExceptions.Contains(name)
@@ -70,6 +73,8 @@ internal static class Program
 #if DEBUG
                 DebugForm.Current.Attach(form);
 #endif
+                // Apply initial theme
+                Utility.ThemeManager.Apply(form);
                 Application.Run(form);
             }
             catch (Exception e)

CreamInstaller/Utility/NativeImports.cs

@@ -21,4 +21,9 @@ internal static partial class NativeImports
     [LibraryImport("user32.dll", SetLastError = true), DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
     internal static partial void SetWindowPos(nint hWnd, nint hWndInsertAfter, int x, int y, int cx, int cy,
         uint uFlags);
+
+    // Windows theming (scrollbars / dark mode for some controls)
+    [LibraryImport("uxtheme.dll", SetLastError = true)]
+    internal static partial int SetWindowTheme(nint hWnd, [MarshalAs(UnmanagedType.LPWStr)] string pszSubAppName,
+        [MarshalAs(UnmanagedType.LPWStr)] string pszSubIdList);
 }

CreamInstaller/Utility/ThemeManager.cs

@@ -0,0 +1,191 @@
+using System;
+using System.Drawing;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace CreamInstaller.Utility;
+
+internal static class ThemeManager
+{
+ // VS-like dark colors
+ private static readonly Color DarkBack = ColorTranslator.FromHtml("#1E1E1E");
+ private static readonly Color DarkBackAlt = ColorTranslator.FromHtml("#252525");
+ private static readonly Color DarkBorder = ColorTranslator.FromHtml("#3F3F46");
+ private static readonly Color DarkFore = ColorTranslator.FromHtml("#D4D4D4");
+ private static readonly Color DarkForeDim = ColorTranslator.FromHtml("#9CA3AF");
+ private static readonly Color Accent = ColorTranslator.FromHtml("#0E639C");
+ private static readonly Color LightBack = SystemColors.Control;
+ private static readonly Color LightBackAlt = SystemColors.ControlLightLight;
+ private static readonly Color LightFore = SystemColors.ControlText;
+ private static readonly Color LightBorder = SystemColors.ControlDark;
+
+ internal static void ToggleDarkMode(Form anyForm)
+ {
+ Program.DarkModeEnabled = !Program.DarkModeEnabled;
+ ApplyToAllOpenForms();
+ }
+
+ internal static void Apply(Form form)
+ {
+ if (form is null) return;
+ if (!Program.DarkModeEnabled)
+ {
+ Reset(form);
+ return;
+ }
+ form.SuspendLayout();
+ form.BackColor = DarkBack;
+ form.ForeColor = DarkFore;
+ ApplyTitleBar(form);
+ foreach (Control c in form.Controls)
+ ApplyControlTheme(c, true);
+ form.ResumeLayout(true);
+ }
+
+ private static void ApplyControlTheme(Control control, bool dark)
+ {
+ if (control is null) return;
+ // recurse first to avoid overwriting multi-level backgrounds incorrectly
+ foreach (Control child in control.Controls)
+ ApplyControlTheme(child, dark);
+ if (dark)
+ {
+ switch (control)
+ {
+ case GroupBox gb:
+ gb.ForeColor = DarkFore;
+ gb.BackColor = DarkBackAlt;
+ break;
+ case Button b:
+ b.FlatStyle = FlatStyle.Flat;
+ b.FlatAppearance.BorderColor = DarkBorder;
+ b.BackColor = DarkBackAlt;
+ b.ForeColor = DarkFore;
+ break;
+ case CheckBox cb:
+ cb.BackColor = DarkBack;
+ cb.ForeColor = DarkFore;
+ break;
+ case Label lbl:
+ lbl.BackColor = DarkBack;
+ lbl.ForeColor = DarkFore;
+ break;
+ case ProgressBar pb:
+ pb.ForeColor = Accent;
+ pb.BackColor = DarkBackAlt;
+ break;
+ case TreeView tv:
+ tv.BackColor = DarkBackAlt;
+ tv.ForeColor = DarkFore;
+ tv.LineColor = DarkBorder;
+ break;
+ case RichTextBox rtb:
+ rtb.BackColor = DarkBackAlt;
+ rtb.ForeColor = DarkFore;
+ break;
+ case TableLayoutPanel tlp:
+ tlp.BackColor = DarkBack;
+ break;
+ case FlowLayoutPanel flp:
+ flp.BackColor = DarkBack;
+ break;
+ }
+ TryApplyScrollbarTheme(control, true);
+ }
+ else
+ {
+ // Light reset per control type
+ switch (control)
+ {
+ case GroupBox gb:
+ gb.BackColor = LightBack;
+ gb.ForeColor = LightFore;
+ break;
+ case Button b:
+ b.FlatStyle = FlatStyle.Standard;
+ b.BackColor = LightBack;
+ b.ForeColor = LightFore;
+ break;
+ case CheckBox cb:
+ cb.BackColor = LightBack;
+ cb.ForeColor = LightFore;
+ break;
+ case Label lbl:
+ lbl.BackColor = LightBack;
+ lbl.ForeColor = LightFore;
+ break;
+ case ProgressBar pb:
+ pb.BackColor = LightBack;
+ pb.ForeColor = LightFore;
+ break;
+ case TreeView tv:
+ tv.BackColor = LightBack;
+ tv.ForeColor = LightFore;
+ tv.LineColor = LightBorder;
+ break;
+ case RichTextBox rtb:
+ rtb.BackColor = LightBack;
+ rtb.ForeColor = LightFore;
+ break;
+ case TableLayoutPanel tlp:
+ tlp.BackColor = LightBack;
+ break;
+ case FlowLayoutPanel flp:
+ flp.BackColor = LightBack;
+ break;
+ }
+ TryApplyScrollbarTheme(control, false);
+ }
+ }
+
+ private static void Reset(Form form)
+ {
+ form.SuspendLayout();
+ form.BackColor = LightBack;
+ form.ForeColor = LightFore;
+ ApplyTitleBar(form);
+ foreach (Control c in form.Controls)
+ ApplyControlTheme(c, false);
+ form.ResumeLayout(true);
+ }
+
+ private static void ApplyToAllOpenForms()
+ {
+ foreach (Form openForm in Application.OpenForms.Cast<Form>())
+ Apply(openForm);
+ }
+
+ private static void ApplyTitleBar(Form form)
+ {
+ try
+ {
+ int useDark = Program.DarkModeEnabled ?1 :0;
+ NativeMethods.EnableDarkTitleBar(form.Handle, useDark);
+ }
+ catch { }
+ }
+
+ private static void TryApplyScrollbarTheme(Control control, bool dark)
+ {
+ // RichTextBox & TreeView host scrollbars internally; use window theme API
+ try
+ {
+ string theme = dark ? "DarkMode_Explorer" : null; // reset with null
+ NativeImports.SetWindowTheme(control.Handle, theme, null);
+ }
+ catch { }
+ }
+}
+
+internal static class NativeMethods
+{
+ private const int DWMWA_USE_IMMERSIVE_DARK_MODE =20; // Windows102004+ /11
+
+ [System.Runtime.InteropServices.DllImport("dwmapi.dll")]
+ private static extern int DwmSetWindowAttribute(System.IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+
+ internal static void EnableDarkTitleBar(System.IntPtr handle, int useDark)
+ {
+ _ = DwmSetWindowAttribute(handle, DWMWA_USE_IMMERSIVE_DARK_MODE, ref useDark, sizeof(int));
+ }
+}