Added flags indicate if an event was used in demo

Demos for x11 and sdl have been update so that `nk_xxx_handle_event'
return true (1) if the given event was usefull and processed by
nuklear and false (1) if not.

demo/sdl_opengl2/nuklear_sdl_gl2.h

@@ -17,7 +17,7 @@
 NK_API struct nk_context*   nk_sdl_init(SDL_Window *win);
 NK_API void                 nk_sdl_font_stash_begin(struct nk_font_atlas **atlas);
 NK_API void                 nk_sdl_font_stash_end(void);
-NK_API void                 nk_sdl_handle_event(SDL_Event *evt);
+NK_API int                  nk_sdl_handle_event(SDL_Event *evt);
 NK_API void                 nk_sdl_render(enum nk_anti_aliasing , int max_vertex_buffer, int max_element_buffer);
 NK_API void                 nk_sdl_shutdown(void);
 
@@ -215,7 +215,7 @@ nk_sdl_font_stash_end(void)
         nk_style_set_font(&sdl.ctx, &sdl.atlas.default_font->handle);
 }
 
-NK_API void
+NK_API int
 nk_sdl_handle_event(SDL_Event *evt)
 {
     struct nk_context *ctx = &sdl.ctx;
@@ -277,7 +277,8 @@ nk_sdl_handle_event(SDL_Event *evt)
             if (state[SDL_SCANCODE_LCTRL])
                 nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
             else nk_input_key(ctx, NK_KEY_RIGHT, down);
-        }
+        } else return 0;
+        return 1;
     } else if (evt->type == SDL_MOUSEBUTTONDOWN || evt->type == SDL_MOUSEBUTTONUP) {
         /* mouse button */
         int down = evt->type == SDL_MOUSEBUTTONDOWN;
@@ -288,18 +289,24 @@ nk_sdl_handle_event(SDL_Event *evt)
             nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
         if (evt->button.button == SDL_BUTTON_RIGHT)
             nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
+        else return 0;
+        return 1;
     } else if (evt->type == SDL_MOUSEMOTION) {
         if (ctx->input.mouse.grabbed) {
             int x = (int)ctx->input.mouse.prev.x, y = (int)ctx->input.mouse.prev.y;
             nk_input_motion(ctx, x + evt->motion.xrel, y + evt->motion.yrel);
         } else nk_input_motion(ctx, evt->motion.x, evt->motion.y);
+        return 1;
     } else if (evt->type == SDL_TEXTINPUT) {
         nk_glyph glyph;
         memcpy(glyph, evt->text.text, NK_UTF_SIZE);
         nk_input_glyph(ctx, glyph);
+        return 1;
     } else if (evt->type == SDL_MOUSEWHEEL) {
         nk_input_scroll(ctx,(float)evt->wheel.y);
+        return 1;
     }
+    return 0;
 }
 
 NK_API

demo/sdl_opengl3/nuklear_sdl_gl3.h

@@ -19,7 +19,7 @@
 NK_API struct nk_context*   nk_sdl_init(SDL_Window *win);
 NK_API void                 nk_sdl_font_stash_begin(struct nk_font_atlas **atlas);
 NK_API void                 nk_sdl_font_stash_end(void);
-NK_API void                 nk_sdl_handle_event(SDL_Event *evt);
+NK_API int                  nk_sdl_handle_event(SDL_Event *evt);
 NK_API void                 nk_sdl_render(enum nk_anti_aliasing , int max_vertex_buffer, int max_element_buffer);
 NK_API void                 nk_sdl_shutdown(void);
 NK_API void                 nk_sdl_device_destroy(void);
@@ -326,7 +326,7 @@ nk_sdl_font_stash_end(void)
 
 }
 
-NK_API void
+NK_API int
 nk_sdl_handle_event(SDL_Event *evt)
 {
     struct nk_context *ctx = &sdl.ctx;
@@ -388,7 +388,8 @@ nk_sdl_handle_event(SDL_Event *evt)
             if (state[SDL_SCANCODE_LCTRL])
                 nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
             else nk_input_key(ctx, NK_KEY_RIGHT, down);
-        }
+        } else return 0;
+        return 1;
     } else if (evt->type == SDL_MOUSEBUTTONDOWN || evt->type == SDL_MOUSEBUTTONUP) {
         /* mouse button */
         int down = evt->type == SDL_MOUSEBUTTONDOWN;
@@ -399,18 +400,23 @@ nk_sdl_handle_event(SDL_Event *evt)
             nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
         if (evt->button.button == SDL_BUTTON_RIGHT)
             nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
+        return 1;
     } else if (evt->type == SDL_MOUSEMOTION) {
         if (ctx->input.mouse.grabbed) {
             int x = (int)ctx->input.mouse.prev.x, y = (int)ctx->input.mouse.prev.y;
             nk_input_motion(ctx, x + evt->motion.xrel, y + evt->motion.yrel);
         } else nk_input_motion(ctx, evt->motion.x, evt->motion.y);
+        return 1;
     } else if (evt->type == SDL_TEXTINPUT) {
         nk_glyph glyph;
         memcpy(glyph, evt->text.text, NK_UTF_SIZE);
         nk_input_glyph(ctx, glyph);
+        return 1;
     } else if (evt->type == SDL_MOUSEWHEEL) {
         nk_input_scroll(ctx,(float)evt->wheel.y);
+        return 1;
     }
+    return 0;
 }
 
 NK_API

demo/x11/nuklear_xlib.h

@@ -20,7 +20,7 @@ NK_API XFont*               nk_xfont_create(Display *dpy, const char *name);
 NK_API void                 nk_xfont_del(Display *dpy, XFont *font);
 
 NK_API struct nk_context*   nk_xlib_init(XFont *font, Display *dpy, int screen, Window root, unsigned int w, unsigned int h);
-NK_API void                 nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt);
+NK_API int                  nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt);
 NK_API void                 nk_xlib_render(Drawable screen, struct nk_color clear);
 NK_API void                 nk_xlib_shutdown(void);
 NK_API void                 nk_xlib_set_font(XFont *font);
@@ -482,7 +482,7 @@ nk_xlib_set_font(XFont *xfont)
     nk_style_set_font(&xlib.ctx, &font);
 }
 
-NK_API void
+NK_API int
 nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
 {
     struct nk_context *ctx = &xlib.ctx;
@@ -554,6 +554,7 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
             }
         }
         XFree(code);
+        return 1;
     } else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
         /* Button handler */
         int down = (evt->type == ButtonPress);
@@ -568,7 +569,8 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
             nk_input_scroll(ctx, 1.0f);
         else if (evt->xbutton.button == Button5)
             nk_input_scroll(ctx, -1.0f);
-
+        else return 0;
+        return 1;
     } else if (evt->type == MotionNotify) {
         /* Mouse motion handler */
         const int x = evt->xmotion.x, y = evt->xmotion.y;
@@ -578,6 +580,7 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
             ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
             XWarpPointer(xlib.dpy, None, xlib.surf->root, 0, 0, 0, 0, (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
         }
+        return 1;
     } else if (evt->type == Expose || evt->type == ConfigureNotify) {
         /* Window resize handler */
         unsigned int width, height;
@@ -586,8 +589,12 @@ nk_xlib_handle_event(Display *dpy, int screen, Window win, XEvent *evt)
         width = (unsigned int)attr.width;
         height = (unsigned int)attr.height;
         nk_xsurf_resize(xlib.surf, width, height);
-    } else if (evt->type == KeymapNotify)
+        return 1;
+    } else if (evt->type == KeymapNotify) {
         XRefreshKeyboardMapping(&evt->xmapping);
+        return 1;
+    }
+    return 0;
 }
 
 NK_API void

demo/x11_opengl2/nuklear_xlib_gl2.h

@@ -17,7 +17,7 @@
 NK_API struct nk_context*   nk_x11_init(Display *dpy, Window win);
 NK_API void                 nk_x11_font_stash_begin(struct nk_font_atlas **atlas);
 NK_API void                 nk_x11_font_stash_end(void);
-NK_API void                 nk_x11_handle_event(XEvent *evt);
+NK_API int                  nk_x11_handle_event(XEvent *evt);
 NK_API void                 nk_x11_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
 NK_API void                 nk_x11_shutdown(void);
 
@@ -199,7 +199,7 @@ nk_x11_font_stash_end(void)
         nk_style_set_font(&x11.ctx, &x11.atlas.default_font->handle);
 }
 
-NK_API void
+NK_API int
 nk_x11_handle_event(XEvent *evt)
 {
     struct nk_context *ctx = &x11.ctx;
@@ -269,6 +269,7 @@ nk_x11_handle_event(XEvent *evt)
             }
         }
         XFree(code);
+        return 1;
     } else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
         /* Button handler */
         int down = (evt->type == ButtonPress);
@@ -283,7 +284,8 @@ nk_x11_handle_event(XEvent *evt)
             nk_input_scroll(ctx, 1.0f);
         else if (evt->xbutton.button == Button5)
             nk_input_scroll(ctx, -1.0f);
-
+        else return 0;
+        return 1;
     } else if (evt->type == MotionNotify) {
         /* Mouse motion handler */
         const int x = evt->xmotion.x, y = evt->xmotion.y;
@@ -293,8 +295,12 @@ nk_x11_handle_event(XEvent *evt)
             ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
             XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0, (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
         }
-    } else if (evt->type == KeymapNotify)
+        return 1;
+    } else if (evt->type == KeymapNotify) {
         XRefreshKeyboardMapping(&evt->xmapping);
+        return 1;
+    }
+    return 0;
 }
 
 NK_API struct nk_context*

demo/x11_opengl3/nuklear_xlib_gl3.h

@@ -17,7 +17,7 @@
 NK_API struct nk_context*   nk_x11_init(Display *dpy, Window win);
 NK_API void                 nk_x11_font_stash_begin(struct nk_font_atlas **atlas);
 NK_API void                 nk_x11_font_stash_end(void);
-NK_API void                 nk_x11_handle_event(XEvent *evt);
+NK_API int                  nk_x11_handle_event(XEvent *evt);
 NK_API void                 nk_x11_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
 NK_API void                 nk_x11_shutdown(void);
 NK_API int                  nk_x11_device_create(void);
@@ -569,7 +569,7 @@ nk_x11_font_stash_end(void)
         nk_style_set_font(&x11.ctx, &x11.atlas.default_font->handle);
 }
 
-NK_API void
+NK_API int
 nk_x11_handle_event(XEvent *evt)
 {
     struct nk_context *ctx = &x11.ctx;
@@ -580,7 +580,7 @@ nk_x11_handle_event(XEvent *evt)
         ctx->input.mouse.grab = 0;
     } else if (ctx->input.mouse.ungrab) {
         XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0,
-            (int)ctx->input.mouse.prev.x, (int)ctx->input.mouse.prev.y);
+            (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
         XUndefineCursor(x11.dpy, x11.win);
         ctx->input.mouse.ungrab = 0;
     }
@@ -639,6 +639,7 @@ nk_x11_handle_event(XEvent *evt)
             }
         }
         XFree(code);
+        return 1;
     } else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
         /* Button handler */
         int down = (evt->type == ButtonPress);
@@ -653,7 +654,8 @@ nk_x11_handle_event(XEvent *evt)
             nk_input_scroll(ctx, 1.0f);
         else if (evt->xbutton.button == Button5)
             nk_input_scroll(ctx, -1.0f);
-
+        else return 0;
+        return 1;
     } else if (evt->type == MotionNotify) {
         /* Mouse motion handler */
         const int x = evt->xmotion.x, y = evt->xmotion.y;
@@ -663,8 +665,12 @@ nk_x11_handle_event(XEvent *evt)
             ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
             XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0, (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
         }
-    } else if (evt->type == KeymapNotify)
+        return 1;
+    } else if (evt->type == KeymapNotify) {
         XRefreshKeyboardMapping(&evt->xmapping);
+        return 1;
+    }
+    return 0;
 }
 
 NK_API struct nk_context*