add hooks for when the window gets/loses focus.

properly refocus draw area.
lay base for dragdrop.

1 files changed, 64 insertions, 4 deletions

diff --git a/src/libui_sdl/libui/windows/window.cpp b/src/libui_sdl/libui/windows/window.cpp
index c04410d..07496b3 100644
--- a/src/libui_sdl/libui/windows/window.cpp
+++ 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;
 }