WIP Menus: Sub-menus appears over the parent-menu scrollbar if there is one (unsure about that) (#126)

imgui.cpp

@@ -1398,6 +1398,7 @@ public:
     float       MenuBarHeight() const                   { return (Flags & ImGuiWindowFlags_MenuBar) ? CalcFontSize() + GImGui->Style.FramePadding.y * 2.0f : 0.0f; }
     ImRect      MenuBarRect() const                     { float y1 = Pos.y + TitleBarHeight(); return ImRect(Pos.x, y1, Pos.x + SizeFull.x, y1 + MenuBarHeight()); }
     ImVec2      WindowPadding() const                   { return ((Flags & ImGuiWindowFlags_ChildWindow) && !(Flags & (ImGuiWindowFlags_ShowBorders | ImGuiWindowFlags_ComboBox | ImGuiWindowFlags_Popup))) ? ImVec2(0,0) : GImGui->Style.WindowPadding; }
+    float       ScrollbarWidth() const                  { return ScrollbarY ? GImGui->Style.ScrollbarWidth : 0.0f; }
     ImU32       Color(ImGuiCol idx, float a=1.f) const  { ImVec4 c = GImGui->Style.Colors[idx]; c.w *= GImGui->Style.Alpha * a; return ImGui::ColorConvertFloat4ToU32(c); }
     ImU32       Color(const ImVec4& col) const          { ImVec4 c = col; c.w *= GImGui->Style.Alpha; return ImGui::ColorConvertFloat4ToU32(c); }
 };
@@ -3554,7 +3555,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
             if (parent_window->DC.MenuBarAppending)
                 rect_to_avoid = ImRect(-FLT_MAX, parent_window->Pos.y + parent_window->TitleBarHeight(), FLT_MAX, parent_window->Pos.y + parent_window->TitleBarHeight() + parent_window->MenuBarHeight());
             else
-                rect_to_avoid = ImRect(parent_window->Pos.x + 4.0f, -FLT_MAX, parent_window->Pos.x + parent_window->Size.x - 4.0f, FLT_MAX); // We want some overlap to convey the relative depth of each popup (here hard-coded to 4)
+                rect_to_avoid = ImRect(parent_window->Pos.x + 4.0f, -FLT_MAX, parent_window->Pos.x + parent_window->Size.x - 4.0f - parent_window->ScrollbarWidth(), FLT_MAX); // We want some overlap to convey the relative depth of each popup (here hard-coded to 4)
             window->PosFloat = FindBestWindowPos(window->PosFloat, window->Size, flags, &window->AutoPosLastDirection, rect_to_avoid);
         }
         else if ((flags & ImGuiWindowFlags_Popup) != 0 && window_appearing_after_being_hidden && !window_pos_set_by_api)
@@ -3683,7 +3684,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
                 else if ((flags & ImGuiWindowFlags_Popup) != 0)
                     window->DrawList->AddRectFilled(window->Pos, window->Pos+window->Size, window->Color(ImGuiCol_WindowBg, bg_alpha), window_rounding);
                 else if ((flags & ImGuiWindowFlags_ChildWindow) != 0)
-                    window->DrawList->AddRectFilled(window->Pos, window->Pos+window->Size-ImVec2(window->ScrollbarY?style.ScrollbarWidth:0.0f,0.0f), window->Color(ImGuiCol_ChildWindowBg, bg_alpha), window_rounding, window->ScrollbarY ? (1|8) : (0xF));
+                    window->DrawList->AddRectFilled(window->Pos, window->Pos+window->Size-ImVec2(window->ScrollbarWidth(),0.0f), window->Color(ImGuiCol_ChildWindowBg, bg_alpha), window_rounding, window->ScrollbarY ? (1|8) : (0xF));
                 else
                     window->DrawList->AddRectFilled(window->Pos, window->Pos+window->Size, window->Color(ImGuiCol_WindowBg, bg_alpha), window_rounding);
             }
@@ -4379,8 +4380,7 @@ ImVec2 ImGui::GetContentRegionMax()
     }
     else
     {
-        if (window->ScrollbarY)
-            mx.x -= GImGui->Style.ScrollbarWidth;
+        mx.x -= window->ScrollbarWidth();
     }
     return mx;
 }
@@ -4395,8 +4395,7 @@ ImVec2 ImGui::GetWindowContentRegionMax()
 {
     ImGuiWindow* window = GetCurrentWindow();
     ImVec2 m = window->Size - window->WindowPadding();
-    if (window->ScrollbarY)
-        m.x -= GImGui->Style.ScrollbarWidth;
+    m.x -= window->ScrollbarWidth();
     return m;
 }