Add DarkMode usage detection support for plugins

Add APIs: 2 new messages NPPM_ISDARKMODEENABLED & NPPM_GETDARKMODECOLORS, and 1 new notification NPPN_DARKMODECHANGED.

Fixed also a bug in dark mode for PushLike CheckBoxes.

Fix #11546, close #11547

PowerEditor/src/MISC/PluginsManager/Notepad_plus_msgs.h

@@ -480,6 +480,36 @@ enum Platform { PF_UNKNOWN, PF_X86, PF_X64, PF_IA64, PF_ARM64 };
 	// MacroStatus NPPM_GETCURRENTMACROSTATUS(0, 0)
 	// Gets current enum class MacroStatus { Idle - means macro is not in use and it's empty, RecordInProgress, RecordingStopped, PlayingBack }
 
+	#define NPPM_ISDARKMODEENABLED (NPPMSG + 107)
+	// bool NPPM_ISDARKMODEENABLED(0, 0)
+	// Returns true when Notepad++ Dark Mode is enable, false when it is not.
+
+	#define NPPM_GETDARKMODECOLORS (NPPMSG + 108)
+	// bool NPPM_GETDARKMODECOLORS (size_t cbSize, NppDarkMode::Colors* returnColors)
+	// - cbSize must be filled with sizeof(NppDarkMode::Colors).
+	// - returnColors must be a pre-allocated NppDarkMode::Colors struct.
+	// Returns true when successful, false otherwise.
+	// You need to uncomment the following code to use NppDarkMode::Colors structure:
+	//
+	// namespace NppDarkMode
+	// {
+	//	struct Colors
+	//	{
+	//		COLORREF background = 0;
+	//		COLORREF softerBackground = 0;
+	//		COLORREF hotBackground = 0;
+	//		COLORREF pureBackground = 0;
+	//		COLORREF errorBackground = 0;
+	//		COLORREF text = 0;
+	//		COLORREF darkerText = 0;
+	//		COLORREF disabledText = 0;
+	//		COLORREF linkText = 0;
+	//		COLORREF edge = 0;
+	//	};
+	// }
+	//
+	// Note: in the case of calling failure ("false" is returned), you may need to change NppDarkMode::Colors structure to:
+	// https://github.com/notepad-plus-plus/notepad-plus-plus/blob/master/PowerEditor/src/NppDarkMode.h#L32
 
 
 #define VAR_NOT_RECOGNIZED 0
@@ -666,3 +696,9 @@ enum Platform { PF_UNKNOWN, PF_X86, PF_X64, PF_IA64, PF_ARM64 };
 	//scnNotification->nmhdr.code = NPPN_FILEDELETED;
 	//scnNotification->nmhdr.hwndFrom = hwndNpp;
 	//scnNotification->nmhdr.idFrom = BufferID;
+
+	#define NPPN_DARKMODECHANGED (NPPN_FIRST + 27) // To notify plugins that Dark Mode was enabled/disabled
+	//scnNotification->nmhdr.code = NPPN_DARKMODECHANGED;
+	//scnNotification->nmhdr.hwndFrom = hwndNpp;
+	//scnNotification->nmhdr.idFrom = 0;
+

PowerEditor/src/NppBigSwitch.cpp

@@ -202,6 +202,12 @@ LRESULT Notepad_plus::process(HWND hwnd, UINT message, WPARAM wParam, LPARAM lPa
 		case NPPM_INTERNAL_REFRESHDARKMODE:
 		{
 			refreshDarkMode(static_cast<bool>(wParam));
+			// Notify plugins that Dark Mode changed
+			SCNotification scnN;
+			scnN.nmhdr.code = NPPN_DARKMODECHANGED;
+			scnN.nmhdr.hwndFrom = reinterpret_cast<void*>(lParam);
+			scnN.nmhdr.idFrom = 0;
+			_pluginsManager.notify(&scnN);
 			return TRUE;
 		}
 
@@ -2605,6 +2611,37 @@ LRESULT Notepad_plus::process(HWND hwnd, UINT message, WPARAM wParam, LPARAM lPa
 			return nppParam.getNppGUI()._maitainIndent;
 		}
 
+		case NPPM_ISDARKMODEENABLED:
+		{
+			return NppDarkMode::isEnabled();
+		}
+
+		case NPPM_GETDARKMODECOLORS:
+		{
+			if (static_cast<size_t>(wParam) != sizeof(NppDarkMode::Colors))
+				return static_cast<LRESULT>(false);
+
+			NppDarkMode::Colors* currentColors = reinterpret_cast<NppDarkMode::Colors*>(lParam);
+
+			if (currentColors != NULL)
+			{
+				currentColors->background = NppDarkMode::getBackgroundColor();
+				currentColors->softerBackground = NppDarkMode::getSofterBackgroundColor();
+				currentColors->hotBackground = NppDarkMode::getHotBackgroundColor();
+				currentColors->pureBackground = NppDarkMode::getDarkerBackgroundColor();
+				currentColors->errorBackground = NppDarkMode::getErrorBackgroundColor();
+				currentColors->text = NppDarkMode::getTextColor();
+				currentColors->darkerText = NppDarkMode::getDarkerTextColor();
+				currentColors->disabledText = NppDarkMode::getDisabledTextColor();
+				currentColors->linkText = NppDarkMode::getLinkTextColor();
+				currentColors->edge = NppDarkMode::getEdgeColor();
+
+				return static_cast<LRESULT>(true);
+			}
+
+			return static_cast<LRESULT>(false);
+		}
+
 		case NPPM_DOCLISTDISABLEPATHCOLUMN:
 		case NPPM_DOCLISTDISABLEEXTCOLUMN:
 		{

PowerEditor/src/NppDarkMode.cpp

@@ -1175,7 +1175,7 @@ namespace NppDarkMode
 			}
 
 			LONG_PTR dwStyle = GetWindowLongPtr(hWnd, GWL_STYLE);
-			if ((dwStyle & TCS_BOTTOM) || (dwStyle & TCS_BUTTONS) || (dwStyle & TCS_VERTICAL))
+			if ((dwStyle & TCS_BUTTONS) || (dwStyle & TCS_VERTICAL))
 			{
 				break;
 			}
@@ -1477,24 +1477,39 @@ namespace NppDarkMode
 					case BS_AUTOCHECKBOX:
 					case BS_RADIOBUTTON:
 					case BS_AUTORADIOBUTTON:
+					{
+						auto nButtonAllStyles = ::GetWindowLongPtr(hwnd, GWL_STYLE);
+						if (nButtonAllStyles & BS_PUSHLIKE)
+						{
+							if (p.theme)
+							{
+								SetWindowTheme(hwnd, p.themeClassName, nullptr);
+							}
+							break;
+						}
 						if (p.subclass)
 						{
 							NppDarkMode::subclassButtonControl(hwnd);
 						}
 						break;
+					}
 					case BS_GROUPBOX:
+					{
 						if (p.subclass)
 						{
 							NppDarkMode::subclassGroupboxControl(hwnd);
 						}
 						break;
+					}
 					case BS_DEFPUSHBUTTON:
 					case BS_PUSHBUTTON:
+					{
 						if (p.theme)
 						{
 							SetWindowTheme(hwnd, p.themeClassName, nullptr);
 						}
 						break;
+					}
 				}
 				return TRUE;
 			}