drag and drop beginnings

Reviewed-on: #33

include/Mw/LowLevel.h

@@ -39,6 +39,7 @@ struct _MwLLCommon {
 	int    type;
 	int    coordinate_type;
 	MwBool supports_transparency;
+	const char** known_mime_types;
 
 	MwLLHandler handler;
 };
@@ -315,6 +316,12 @@ MWDECL void (*MwLLGetClipboard)(MwLL handle, int clipboard_type);
 MWDECL void (*MwLLGetCursorCoord)(MwLL handle, MwPoint* point);
 MWDECL void (*MwLLGetScreenSize)(MwLL handle, MwRect* rect);
 
+/*!
+ * @brief Setup drag and drop capabilities, should the user request it with MwNacceptsDnD
+ * @param handle Handle
+ */
+MWDECL void (*MwLLSetupDragAndDrop)(MwLL handle);
+
 /*!
  * @brief Set any extra parameters for dark theme
  * @param handle Handle

include/Mw/LowLevel/GDI.h

@@ -29,6 +29,11 @@ struct _MwLLGDI {
 	int force_render;
 	int get_clipboard;
 	int get_darktheme;
+
+	/* drag and drop */
+	struct _MwLLGDIDropTarget* dropTarget;
+	struct _MwLLGDIDropSource* dropSource;
+	MwBool drag_update;
 };
 
 struct _MwLLGDIColor {
@@ -47,6 +52,14 @@ struct _MwLLGDIPixmap {
 	HBITMAP	 hMask2;
 };
 
+struct _MwLLGDIDropTarget{
+    struct IDropTargetVtbl *lpVtbl;
+    LONG refCount;
+    HWND hwnd;
+    MwLL handle;
+};
+typedef struct _MwLLGDIDropTarget MwLLGDIDropTarget;
+
 MWDECL int     MwLLGDICallInit(void);
 MWDECL HCURSOR MwLLGDICreateCursor(MwCursor* image, MwCursor* mask);
 

include/Mw/StringDefs.h

@@ -53,6 +53,7 @@
 #define MwNcolumnSpan "IcolumnSpan"
 #define MwNrowSpan "IrowSpan"
 #define MwNdisabled "Idisabled"
+#define MwNacceptsDnD "IacceptsDnD"
 
 #define MwNtitle "Stitle"
 #define MwNtext "Stext"
@@ -62,6 +63,8 @@
 #define MwNforeground "Sforeground"
 #define MwNsubForeground "SsubForeground"
 #define MwNtitleForeground "StitleForeground"
+#define MwNacceptedMimeType "SacceptedMimeType"
+
 
 #define MwNvulkanExtension "SEvulkanExtension"
 #define MwNvulkanLayer "SEvulkanLayer"
@@ -98,5 +101,6 @@
 #define MwNdrawHandler "Cdraw"
 #define MwNclipboardHandler "Cclipboard"
 #define MwNdarkThemeHandler "CdarkTheme"
+#define MwNdragAndDropHandler "CdragAndDrop"
 
 #endif

include/Mw/TypeDefs.h

@@ -274,7 +274,7 @@ struct _MwClass {
 	MwHandlerChildrenProp	   children_prop_change;
 	MwHandlerClipboardReceived clipboard;
 	MwHandlerProps		   props_change;
-	void*			   reserved1;
+	MwHandler			   drag_and_drop;
 	void*			   reserved2;
 	void*			   reserved3;
 };