Nav: Menus and popups now have move request wrap around vertically (using the move request forward thing added recently). (#787)

imgui.cpp

@@ -4476,11 +4476,28 @@ bool ImGui::BeginPopupModal(const char* name, bool* p_open, ImGuiWindowFlags ext
     return is_open;
 }
 
+static void NavProcessMoveRequestWrapAround(ImGuiWindow* window)
+{
+    ImGuiContext& g = *GImGui;
+    if (g.NavMoveRequest && g.NavWindow == window && g.NavMoveResultId == 0)
+        if ((g.NavMoveDir == ImGuiDir_Up || g.NavMoveDir == ImGuiDir_Down) && g.NavMoveRequestForwardStep == 0 && g.NavLayer == 0)
+        {
+            g.NavMoveRequest = false;
+            g.NavMoveRequestForwardStep = 1;
+            g.NavWindow->NavRectRel[0].Min.y = g.NavWindow->NavRectRel[0].Max.y = (g.NavMoveDir == ImGuiDir_Up) ? window->SizeFull.y : 0.0f;
+        }
+}
+
 void ImGui::EndPopup()
 {
+    ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
     IM_ASSERT(window->Flags & ImGuiWindowFlags_Popup);  // Mismatched BeginPopup()/EndPopup() calls
-    IM_ASSERT(GImGui->CurrentPopupStack.Size > 0);
+    IM_ASSERT(g.CurrentPopupStack.Size > 0);
+
+    // Make all menus and popups wrap around for now, may need to expose that policy.
+    NavProcessMoveRequestWrapAround(window);
+    
     End();
     if (!(window->Flags & ImGuiWindowFlags_Modal))
         PopStyleVar();

imgui_internal.h

@@ -484,9 +484,9 @@ struct ImGuiContext
     bool                    NavInitDefaultResultExplicit;       // Whether the result was explicitly requested with SetItemDefaultFocus()
     bool                    NavMoveFromClampedRefRect;          // Set by manual scrolling, if we scroll to a point where NavId isn't visible we reset navigation from visible items
     bool                    NavMoveRequest;                     // Move request for this frame
-    int                     NavMoveRequestForwardStep;          // 0: no forward, 1: forward request, 2: forward result
-    ImGuiDir                NavMoveDir;                         // West/East/North/South
-    ImGuiDir                NavMoveDirLast;                     //
+    int                     NavMoveRequestForwardStep;          // 0: no forward, 1: forward request, 2: forward result (this is used to navigate sibling parent menus from a child menu)
+    ImGuiDir                NavMoveDir;                         // Direction of the move request (left/right/up/down)
+    ImGuiDir                NavMoveDirLast;                     // Direction of the previous move request
     ImGuiID                 NavMoveResultId;                    // Best move request candidate
     ImGuiID                 NavMoveResultParentId;              //
     float                   NavMoveResultDistBox;               // Best move request candidate box distance to current NavId