Nav: Made CTRL+TAB skip menus + skip the current navigation window if is has the ImGuiWindow_NoNavFocus set. (#787)

While it was previously possible, you won't be able to CTRL-TAB out and immediately back in a window with the ImGuiWindow_NoNavFocus flag.

CHANGELOG.txt

@@ -45,7 +45,9 @@ Other Changes:
 
  - ArrowButton: Fixed to honor PushButtonRepeat() setting (and internals' ImGuiItemFlags_ButtonRepeat).
  - ArrowButton: Setup current line text baseline so that ArrowButton() + SameLine() + Text() are aligned properly.
- - Nav: Added a CTRL+TAB window list and changed the highlight system accordingly. This is designed to allow CTRL+TAB between Tabs in the future. (#787)
+ - Nav: Added a CTRL+TAB window list and changed the highlight system accordingly. The change is motivated by upcoming Docking features. (#787)
+ - Nav: Made CTRL+TAB skip menus + skip the current navigation window if is has the ImGuiWindow_NoNavFocus set. (#787)
+   While it was previously possible, you won't be able to CTRL-TAB out and immediately back in a window with the ImGuiWindow_NoNavFocus flag.
  - Window: Allow menu and popups windows from ignoring the style.WindowMinSize values so short menus/popups are not padded. (#1909)
  - Window: Added global io.OptResizeWindowsFromEdges option to enable resizing windows from their edges and from the lower-left corner. (#1495)
  - Window: Collapse button shows hovering highlight + clicking and dragging on it allows to drag the window as well. 

imgui.cpp

@@ -3012,7 +3012,7 @@ static int FindWindowIndex(ImGuiWindow* window) // FIXME-OPT O(N)
     return -1;
 }
 
-static ImGuiWindow* FindWindowNavigable(int i_start, int i_stop, int dir) // FIXME-OPT O(N)
+static ImGuiWindow* FindWindowNavFocusable(int i_start, int i_stop, int dir) // FIXME-OPT O(N)
 {
     ImGuiContext& g = *GImGui;
     for (int i = i_start; i >= 0 && i < g.Windows.Size && i != i_stop; i += dir)
@@ -3084,9 +3084,9 @@ static void NavUpdateWindowingHighlightWindow(int focus_change_dir)
         return;
 
     const int i_current = FindWindowIndex(g.NavWindowingTarget);
-    ImGuiWindow* window_target = FindWindowNavigable(i_current + focus_change_dir, -INT_MAX, focus_change_dir);
+    ImGuiWindow* window_target = FindWindowNavFocusable(i_current + focus_change_dir, -INT_MAX, focus_change_dir);
     if (!window_target)
-        window_target = FindWindowNavigable((focus_change_dir < 0) ? (g.Windows.Size - 1) : 0, i_current, focus_change_dir);
+        window_target = FindWindowNavFocusable((focus_change_dir < 0) ? (g.Windows.Size - 1) : 0, i_current, focus_change_dir);
     if (window_target) // Don't reset windowing target if there's a single window in the list
         g.NavWindowingTarget = g.NavWindowingTargetAnim = window_target;
     g.NavWindowingToggleLayer = false;
@@ -3118,7 +3118,7 @@ static void ImGui::NavUpdateWindowing()
     bool start_windowing_with_gamepad = !g.NavWindowingTarget && IsNavInputPressed(ImGuiNavInput_Menu, ImGuiInputReadMode_Pressed);
     bool start_windowing_with_keyboard = !g.NavWindowingTarget && g.IO.KeyCtrl && IsKeyPressedMap(ImGuiKey_Tab) && (g.IO.ConfigFlags & ImGuiConfigFlags_NavEnableKeyboard);
     if (start_windowing_with_gamepad || start_windowing_with_keyboard)
-        if (ImGuiWindow* window = g.NavWindow ? g.NavWindow : FindWindowNavigable(g.Windows.Size - 1, -INT_MAX, -1))
+        if (ImGuiWindow* window = g.NavWindow ? g.NavWindow : FindWindowNavFocusable(g.Windows.Size - 1, -INT_MAX, -1))
         {
             g.NavWindowingTarget = g.NavWindowingTargetAnim = window;
             g.NavWindowingTimer = g.NavWindowingHighlightAlpha = 0.0f;
@@ -7436,8 +7436,7 @@ bool ImGui::IsWindowFocused(ImGuiFocusedFlags flags)
 // Can we focus this window with CTRL+TAB (or PadMenu + PadFocusPrev/PadFocusNext)
 bool ImGui::IsWindowNavFocusable(ImGuiWindow* window)
 {
-    ImGuiContext& g = *GImGui;
-    return window->Active && window == window->RootWindow && (!(window->Flags & ImGuiWindowFlags_NoNavFocus) || window == g.NavWindow);
+    return window->Active && window == window->RootWindow && !(window->Flags & ImGuiWindowFlags_NoNavFocus);
 }
 
 float ImGui::GetWindowWidth()
@@ -12172,7 +12171,9 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
     {
         // Sub-menus are ChildWindow so that mouse can be hovering across them (otherwise top-most popup menu would steal focus and not allow hovering on parent menu)
         SetNextWindowPos(popup_pos, ImGuiCond_Always);
-        ImGuiWindowFlags flags = ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ((window->Flags & (ImGuiWindowFlags_Popup|ImGuiWindowFlags_ChildMenu)) ? ImGuiWindowFlags_ChildMenu|ImGuiWindowFlags_ChildWindow : ImGuiWindowFlags_ChildMenu);
+        ImGuiWindowFlags flags = ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoNavFocus;
+        if (window->Flags & (ImGuiWindowFlags_Popup|ImGuiWindowFlags_ChildMenu))
+            flags |= ImGuiWindowFlags_ChildWindow;
         menu_is_open = BeginPopupEx(id, flags); // menu_is_open can be 'false' when the popup is completely clipped (e.g. zero size display)
     }