add hooks for when the window gets/loses focus.

properly refocus draw area.
lay base for dragdrop.

src/libui_sdl/libui/ui.h

@@ -106,8 +106,6 @@ _UI_EXTERN void uiWindowContentSize(uiWindow *w, int *width, int *height);
 _UI_EXTERN void uiWindowSetContentSize(uiWindow *w, int width, int height);
 _UI_EXTERN int uiWindowFullscreen(uiWindow *w);
 _UI_EXTERN void uiWindowSetFullscreen(uiWindow *w, int fullscreen);
-_UI_EXTERN void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data);
-_UI_EXTERN void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *w, void *data), void *data);
 _UI_EXTERN int uiWindowBorderless(uiWindow *w);
 _UI_EXTERN void uiWindowSetBorderless(uiWindow *w, int borderless);
 _UI_EXTERN void uiWindowSetChild(uiWindow *w, uiControl *child);
@@ -115,6 +113,12 @@ _UI_EXTERN int uiWindowMargined(uiWindow *w);
 _UI_EXTERN void uiWindowSetMargined(uiWindow *w, int margined);
 _UI_EXTERN uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar);
 
+_UI_EXTERN void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data);
+_UI_EXTERN void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *w, void *data), void *data);
+_UI_EXTERN void uiWindowOnDropFile(uiWindow *w, void (*f)(uiWindow *w, char *file, void *data), void *data);
+_UI_EXTERN void uiWindowOnGetFocus(uiWindow *w, void (*f)(uiWindow *w, void *data), void *data);
+_UI_EXTERN void uiWindowOnLoseFocus(uiWindow *w, void (*f)(uiWindow *w, void *data), void *data);
+
 typedef struct uiButton uiButton;
 #define uiButton(this) ((uiButton *) (this))
 _UI_EXTERN char *uiButtonText(uiButton *b);

src/libui_sdl/libui/windows/window.cpp

@@ -10,16 +10,23 @@ struct uiWindow {
 	uiControl *child;
 	BOOL shownOnce;
 	int visible;
-	int (*onClosing)(uiWindow *, void *);
-	void *onClosingData;
 	int margined;
 	BOOL hasMenubar;
-	void (*onContentSizeChanged)(uiWindow *, void *);
-	void *onContentSizeChangedData;
 	BOOL changingSize;
 	int fullscreen;
 	WINDOWPLACEMENT fsPrevPlacement;
 	int borderless;
+
+	int (*onClosing)(uiWindow *, void *);
+	void *onClosingData;
+	void (*onContentSizeChanged)(uiWindow *, void *);
+	void *onContentSizeChangedData;
+	void (*onDropFile)(uiWindow *, char *, void *);
+	void *onDropFileData;
+	void (*onGetFocus)(uiWindow *, void *);
+	void *onGetFocusData;
+	void (*onLoseFocus)(uiWindow *, void *);
+	void *onLoseFocusData;
 };
 
 // from https://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
@@ -108,6 +115,37 @@ static LRESULT CALLBACK windowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARA
 		mmi->ptMinTrackSize.x = width;
 		mmi->ptMinTrackSize.y = height;
 		return lResult;
+
+    case WM_DROPFILES:
+        if (w->onDropFile)
+        {
+            HDROP eggdrop = (HDROP)wParam;
+            WCHAR filename[1024];
+            DragQueryFile(eggdrop, 0, filename, 1024);
+
+            char* filename8 = toUTF8(filename);
+            w->onDropFile(w, filename8, w->onDropFileData);
+            uiFreeText(filename8);
+
+            DragFinish(eggdrop);
+        }
+        break;
+
+    case WM_SETFOCUS:
+        if (w->onGetFocus)
+        {
+            w->onGetFocus(w, w->onGetFocusData);
+            return 0;
+        }
+        break;
+    case WM_KILLFOCUS:
+        if (w->onLoseFocus)
+        {
+            w->onLoseFocus(w, w->onLoseFocusData);
+            return 0;
+        }
+        break;
+
 	case WM_PRINTCLIENT:
 		// we do no special painting; just erase the background
 		// don't worry about the return value; we let DefWindowProcW() handle this message
@@ -383,6 +421,24 @@ void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 	w->onClosingData = data;
 }
 
+void uiWindowOnDropFile(uiWindow *w, void (*f)(uiWindow *, char *, void *), void *data)
+{
+	w->onDropFile = f;
+	w->onDropFileData = data;
+}
+
+void uiWindowOnGetFocus(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onGetFocus = f;
+	w->onGetFocusData = data;
+}
+
+void uiWindowOnLoseFocus(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onLoseFocus = f;
+	w->onLoseFocusData = data;
+}
+
 int uiWindowBorderless(uiWindow *w)
 {
 	return w->borderless;
@@ -492,6 +548,10 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 	uiWindowOnClosing(w, defaultOnClosing, NULL);
 	uiWindowOnContentSizeChanged(w, defaultOnPositionContentSizeChanged, NULL);
 
+	uiWindowOnDropFile(w, NULL, NULL);
+	uiWindowOnGetFocus(w, NULL, NULL);
+	uiWindowOnLoseFocus(w, NULL, NULL);
+
 	windows[w] = true;
 	return w;
 }

src/libui_sdl/main.cpp

@@ -295,6 +295,21 @@ int OnCloseWindow(uiWindow* window, void* blarg)
     return 1;
 }
 
+void OnDropFile(uiWindow* window, char* file, void* blarg)
+{
+    printf("DROP: %s\n", file);
+}
+
+void OnGetFocus(uiWindow* window, void* blarg)
+{
+    uiControlSetFocus(uiControl(MainDrawArea));
+}
+
+void OnLoseFocus(uiWindow* window, void* blarg)
+{
+    // TODO: shit here?
+}
+
 void OnCloseByMenu(uiMenuItem* item, uiWindow* window, void* blarg)
 {
     uiControlDestroy(uiControl(window));
@@ -431,6 +446,9 @@ int main(int argc, char** argv)
 
     MainWindow = uiNewWindow("melonDS " MELONDS_VERSION, 256, 384, 1);
     uiWindowOnClosing(MainWindow, OnCloseWindow, NULL);
+    uiWindowOnDropFile(MainWindow, OnDropFile, NULL);
+    uiWindowOnGetFocus(MainWindow, OnGetFocus, NULL);
+    uiWindowOnLoseFocus(MainWindow, OnLoseFocus, NULL);
 
     uiMenuItemDisable(MenuItem_Pause);
     uiMenuItemDisable(MenuItem_Reset);
@@ -452,7 +470,7 @@ int main(int argc, char** argv)
     EmuThread = SDL_CreateThread(EmuThreadFunc, "melonDS magic", NULL);
 
     uiControlShow(uiControl(MainWindow));
-    //uiControlSetFocus(uiControl(MainDrawArea)); // TODO: this needs to be done when the window regains focus
+    uiControlSetFocus(uiControl(MainDrawArea));
     uiMain();
 
     EmuRunning = 0;