started on win32 dnd

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 +29,28 @@ struct _MwLLGDI {
 	int force_render;
 	int get_clipboard;
 	int get_darktheme;
+
+	/* drag and drop */
+	void *shell32lib;
+	void *ole32lib;
+	void *urlmonlib;
+	UINT (*DragQueryFileW)(HDROP  hDrop,UINT   iFile,LPWSTR lpszFile,UINT   cch);
+	void (*ReleaseStgMedium)(LPSTGMEDIUM unnamedParam1);
+	HRESULT (*OleInitialize)(LPVOID pvReserved);
+	HRESULT (*RegisterDragDrop)(HWND hwnd, LPDROPTARGET pDropTarget);
+	HRESULT (*FindMimeFromData)(
+             LPBC    pBC,
+             LPCWSTR pwzUrl,
+             LPVOID  pBuffer,
+             DWORD   cbSize,
+             LPCWSTR pwzMimeProposed,
+             DWORD   dwMimeFlags,
+             LPWSTR  *ppwzMimeOut,
+             _Reserved_ DWORD   dwReserved
+	);
+	struct _MwLLGDIDropTarget* dropTarget;
+	MwBool listening_for_drag_and_drop;
+	MwBool dnd_override;
 };
 
 struct _MwLLGDIColor {
@@ -47,6 +69,14 @@ 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"