Pass non-handled keyboard events to parent window (X11 only)

Closes #2

dgl/src/Window.cpp

@@ -677,12 +677,15 @@ struct Window::PrivateData {
         fSelf->onDisplayAfter();
     }
 
-    void onPuglKeyboard(const bool press, const uint key)
+    int onPuglKeyboard(const bool press, const uint key)
     {
         DBGp("PUGL: onKeyboard : %i %i\n", press, key);
 
         if (fModal.childFocus != nullptr)
-            return fModal.childFocus->focus();
+        {
+            fModal.childFocus->focus();
+            return 0;
+        }
 
         Widget::KeyboardEvent ev;
         ev.press = press;
@@ -695,16 +698,21 @@ struct Window::PrivateData {
             Widget* const widget(*rit);
 
             if (widget->isVisible() && widget->onKeyboard(ev))
-                break;
+                return 0;
         }
+
+        return 1;
     }
 
-    void onPuglSpecial(const bool press, const Key key)
+    int onPuglSpecial(const bool press, const Key key)
     {
         DBGp("PUGL: onSpecial : %i %i\n", press, key);
 
         if (fModal.childFocus != nullptr)
-            return fModal.childFocus->focus();
+        {
+            fModal.childFocus->focus();
+            return 0;
+        }
 
         Widget::SpecialEvent ev;
         ev.press = press;
@@ -717,8 +725,10 @@ struct Window::PrivateData {
             Widget* const widget(*rit);
 
             if (widget->isVisible() && widget->onSpecial(ev))
-                break;
+                return 0;
         }
+
+        return 1;
     }
 
     void onPuglMouse(const int button, const bool press, const int x, const int y)
@@ -889,14 +899,14 @@ struct Window::PrivateData {
         handlePtr->onPuglDisplay();
     }
 
-    static void onKeyboardCallback(PuglView* view, bool press, uint32_t key)
+    static int onKeyboardCallback(PuglView* view, bool press, uint32_t key)
     {
-        handlePtr->onPuglKeyboard(press, key);
+        return handlePtr->onPuglKeyboard(press, key);
     }
 
-    static void onSpecialCallback(PuglView* view, bool press, PuglKey key)
+    static int onSpecialCallback(PuglView* view, bool press, PuglKey key)
     {
-        handlePtr->onPuglSpecial(press, static_cast<Key>(key));
+        return handlePtr->onPuglSpecial(press, static_cast<Key>(key));
     }
 
     static void onMouseCallback(PuglView* view, int button, bool press, int x, int y)

dgl/src/pugl/pugl.h

@@ -74,8 +74,9 @@ typedef void (*PuglDisplayFunc)(PuglView* view);
    @param view The view the event occured in.
    @param press True if the key was pressed, false if released.
    @param key Unicode point of the key pressed.
+   @return 0 if event was handled, otherwise send event to parent window.
 */
-typedef void (*PuglKeyboardFunc)(PuglView* view, bool press, uint32_t key);
+typedef int (*PuglKeyboardFunc)(PuglView* view, bool press, uint32_t key);
 
 /**
    A function called when the pointer moves.
@@ -129,8 +130,9 @@ typedef void (*PuglScrollFunc)(PuglView* view, int x, int y, float dx, float dy)
    @param view The view the event occured in.
    @param press True if the key was pressed, false if released.
    @param key The key pressed.
+   @return 0 if event was handled, otherwise send event to parent window.
 */
-typedef void (*PuglSpecialFunc)(PuglView* view, bool press, PuglKey key);
+typedef int (*PuglSpecialFunc)(PuglView* view, bool press, PuglKey key);
 
 /**
    A function called when a filename is selected via file-browser.

dgl/src/pugl/pugl_x11.c

@@ -430,6 +430,7 @@ dispatchKey(PuglView* view, XEvent* event, bool press)
 {
 	KeySym    sym;
 	char      str[5];
+	PuglKey   special;
 	const int n = XLookupString(&event->xkey, str, 4, &sym, NULL);
 
 	if (sym == XK_Escape && view->closeFunc && !press && !view->parent) {
@@ -438,18 +439,30 @@ dispatchKey(PuglView* view, XEvent* event, bool press)
 		return;
 	}
 	if (n == 0) {
+		goto send_event;
 		return;
 	}
 	if (n > 1) {
 		fprintf(stderr, "warning: Unsupported multi-byte key %X\n", (int)sym);
+		goto send_event;
 		return;
 	}
 
-	const PuglKey special = keySymToSpecial(sym);
+	special = keySymToSpecial(sym);
 	if (special && view->specialFunc) {
-		view->specialFunc(view, press, special);
+		if (view->specialFunc(view, press, special) == 0) {
+			return;
+		}
 	} else if (!special && view->keyboardFunc) {
-		view->keyboardFunc(view, press, str[0]);
+		if (view->keyboardFunc(view, press, str[0]) == 0) {
+			return;
+		}
+	}
+
+send_event:
+	if (view->parent) {
+		event->xany.window = view->parent;
+		XSendEvent(view->impl->display, view->parent, True, press ? KeyPressMask : KeyReleaseMask, event);
 	}
 }