got overlapped gui clipping working

4ed_file_view.cpp

@@ -3650,6 +3650,7 @@ step_file_view(System_Functions *system, View *view, b32 is_active){
         
         if (view->showing_ui == VUI_None){
             gui_begin_overlap(target);
+            {
                 do_widget(view, target);
                 
                 gui_begin_serial_section(target);
@@ -3683,13 +3684,11 @@ step_file_view(System_Functions *system, View *view, b32 is_active){
                     }
 
                     gui_begin_scrollable(target, view->showing_ui, view->file_scroll, delta);
-
                     gui_do_file(target);
-                
                     gui_end_scrollable(target);
                 }
                 gui_end_serial_section(target);
-            
+            }
             gui_end_overlap(target);
         }
         else{
@@ -4071,7 +4070,7 @@ do_input_file_view(System_Functions *system, Exchange *exchange,
                 
                 case guicom_file:
                 {
-                    f32 new_min_y = -(f32)(gui_session.clip_rect.y0 - gui_session.rect.y0);
+                    f32 new_min_y = -(f32)(gui_session_get_eclipsed_y(&gui_session)  - gui_session.rect.y0);
                     f32 new_max_y = view_compute_max_target_y(view);
                     
                     view->gui_target.scroll_updated.min_y = new_min_y;
@@ -4663,10 +4662,19 @@ do_render_file_view(System_Functions *system, Exchange *exchange,
     
     v = view_get_scroll_y(view);
     
+    i32_Rect clip_rect = rect;
+    draw_push_clip(target, clip_rect);
+    
     for (h = (GUI_Header*)gui_target->push.base;
         h->type;
         h = NextHeader(h)){
         if (gui_interpret(&view->gui_target, &gui_session, h)){
+            
+            if (gui_session.clip_y > clip_rect.y0){
+                clip_rect.y0 = gui_session.clip_y;
+                draw_change_clip(target, clip_rect);
+            }
+            
             switch (h->type){
                 case guicom_top_bar:
                 {
@@ -4778,18 +4786,20 @@ do_render_file_view(System_Functions *system, Exchange *exchange,
 				}break;
                 
                 case guicom_begin_scrollable_section:
-                {
+                clip_rect.x1 -= gui_session.scroll_bar_w;
-                    target->push_clip(target, gui_session.absolute_rect);
+                draw_push_clip(target, clip_rect);
-				}break;
+                break;
                 
                 case guicom_end_scrollable_section:
-                {
+                clip_rect.x1 += gui_session.scroll_bar_w;
-                    target->pop_clip(target);
+                draw_pop_clip(target);
-                }break;
+                break;
 			}
 		}
 	}
     
+    draw_pop_clip(target);
+
     return(result);
     
 #if 0    

4ed_gui.cpp

@@ -428,6 +428,8 @@ internal void
 gui_begin_scrollable(GUI_Target *target, u32 scroll_id, GUI_Scroll_Vars scroll_vars, f32 delta){
     GUI_Header *h;
     
+    gui_begin_serial_section(target);
+    
     target->delta = delta;
     h = gui_push_simple_command(target, guicom_scrollable);
     
@@ -444,6 +446,7 @@ gui_begin_scrollable(GUI_Target *target, u32 scroll_id, GUI_Scroll_Vars scroll_v
 internal void
 gui_end_scrollable(GUI_Target *target){
     gui_push_simple_command(target, guicom_end_scrollable_section);
+    gui_end_serial_section(target);
 }
 
 internal void
@@ -453,17 +456,16 @@ gui_activate_scrolling(GUI_Target *target){
 
 struct GUI_Section{
     b32 overlapped;
-    i32 max_v, v;
+    i32 max_v, v, top_v;
 };
 
 struct GUI_Session{
     i32_Rect full_rect;
-    i32_Rect clip_rect;
     i32_Rect rect;
-    i32_Rect absolute_rect;
     
     f32 suggested_min_y;
     f32 suggested_max_y;
+    i32 clip_y;
     
     i32 line_height;
     i32 scroll_bar_w;
@@ -479,6 +481,26 @@ struct GUI_Session{
 
 #define GUIScrollbarWidth 16
 
+internal i32
+gui_session_get_eclipsed_y(GUI_Session *session){
+    GUI_Section *section = session->sections;
+    i32 count = session->t + 1, i;
+    i32 max_v = 0;
+    for (i = 0; i < count; ++i, ++section){
+        if (section->overlapped){
+            max_v = Max(max_v, section->max_v);
+        }
+    }
+    max_v = Max(max_v, session->sections[count-1].top_v);
+    return(max_v);
+}
+
+internal i32
+gui_session_get_current_top(GUI_Session *session){
+    i32 result = session->sections[session->t].top_v;
+    return(result);
+}
+
 internal void
 gui_session_init(GUI_Session *session, i32_Rect full_rect, i32 line_height){
     GUI_Section *section;
@@ -498,8 +520,10 @@ gui_section_end_item(GUI_Section *section, i32 v){
     if (!section->overlapped){
         section->v = v;
 	}
+    if (section->max_v < v){
         section->max_v = v;
     }
+}
 
 inline i32_Rect
 gui_layout_top_bottom(GUI_Session *session, i32 y0, i32 y1){
@@ -608,6 +632,7 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
         new_section->overlapped = 1;
         new_section->v = y;
         new_section->max_v = y;
+        new_section->top_v = y;
         break;
 
         case guicom_end_overlap:
@@ -625,6 +650,7 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
         new_section->overlapped = 0;
         new_section->v = y;
         new_section->max_v = y;
+        new_section->top_v = y;
         break;
 
         case guicom_end_serial:
@@ -732,7 +758,7 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
 
         case guicom_end_scrollable_section:
         always_give_to_user = 1;
-        session->suggested_min_y = -(f32)(session->clip_rect.y0 - session->rect.y0);
+        session->suggested_min_y = -(f32)(gui_session_get_eclipsed_y(session) - gui_session_get_current_top(session));
         session->suggested_max_y = (f32)(session->scrollable_items_bottom - session->full_rect.y1 * .5f);
         if (session->suggested_max_y < 0){
             session->suggested_max_y = 0;
@@ -741,19 +767,7 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
     }
     
     if (do_layout){
-        GUI_Section *section = session->sections;
-        i32 max_v = 0;
-        i32 i = 0;
-        
-        session->absolute_rect = rect;
-
         if (give_to_user){
-            for (i = 0; i <= session->t; ++i, ++section){
-                if (section->overlapped){
-                    max_v = Max(max_v, section->max_v);
-                }
-            }
-
             if (session->is_scrollable){
                 session->scrollable_items_bottom = Max(session->scrollable_items_bottom, rect.y1);
             }
@@ -763,13 +777,6 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
             
             if (rect.y1 > session->full_rect.y0){
                 session->rect = rect;
-
-                rect.y0 += scroll_v;
-                if (rect.y0 < max_v){
-                    rect.y0 = max_v;
-                }
-                rect.y0 -= scroll_v;
-                session->clip_rect = rect;
             }
             else{
                 give_to_user = 0;
@@ -785,6 +792,8 @@ gui_interpret(GUI_Target *target, GUI_Session *session, GUI_Header *h){
         }
     }
     
+    session->clip_y = gui_session_get_eclipsed_y(session);
+    
     return(give_to_user || always_give_to_user);
 }
 

4ed_rendering_helper.cpp

@@ -19,6 +19,12 @@ draw_pop_clip(Render_Target *target){
     target->pop_clip(target);
 }
 
+inline void
+draw_change_clip(Render_Target *target, i32_Rect clip_box){
+    target->pop_clip(target);
+    target->push_clip(target, clip_box);
+}
+
 internal void
 begin_render_section(Render_Target *target, System_Functions *system){
     Font_Set *font_set = &target->font_set;