Docking: Added ImGuiDockNodeFlags_NoDocking flag. (#2109)

imgui.cpp

@@ -13122,6 +13122,8 @@ static void ImGui::DockNodePreviewDockCalc(ImGuiWindow* host_window, ImGuiDockNo
     data->IsCenterAvailable = !is_outer_docking;
     if (src_is_visibly_splitted && (!host_node || !host_node->IsEmpty()))
         data->IsCenterAvailable = false;
+    if (host_node && (host_node_flags & ImGuiDockNodeFlags_NoDocking))
+        data->IsCenterAvailable = false;
     if (host_node && (host_node_flags & ImGuiDockNodeFlags_NoDockingInCentralNode) && host_node->IsCentralNode())
         data->IsCenterAvailable = false;
 
@@ -15102,6 +15104,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                 ImGui::BulletText("Misc:%s%s%s%s", node->IsDockSpace() ? " IsDockSpace" : "", node->IsCentralNode() ? " IsCentralNode" : "", (g.FrameCount - node->LastFrameAlive < 2) ? " IsAlive" : "", (g.FrameCount - node->LastFrameActive < 2) ? " IsActive" : "");
                 if (ImGui::TreeNode("flags", "LocalFlags: 0x%04X SharedFlags: 0x%04X", node->LocalFlags, node->SharedFlags))
                 {
+                    ImGui::CheckboxFlags("LocalFlags: NoDocking", (ImU32*)&node->LocalFlags, ImGuiDockNodeFlags_NoDocking);
                     ImGui::CheckboxFlags("LocalFlags: NoSplit", (ImU32*)&node->LocalFlags, ImGuiDockNodeFlags_NoSplit);
                     ImGui::CheckboxFlags("LocalFlags: NoResize", (ImU32*)&node->LocalFlags, ImGuiDockNodeFlags_NoResize);
                     ImGui::CheckboxFlags("LocalFlags: NoTabBar", (ImU32*)&node->LocalFlags, ImGuiDockNodeFlags_NoTabBar);

imgui_internal.h

@@ -916,10 +916,11 @@ enum ImGuiDockNodeFlagsPrivate_
     ImGuiDockNodeFlags_HiddenTabBar             = 1 << 13,  // Local, Saved  // Tab bar is hidden, with a triangle in the corner to show it again (NB: actual tab-bar instance may be destroyed as this is only used for single-window tab bar)
     ImGuiDockNodeFlags_NoWindowMenuButton       = 1 << 14,  // Local, Saved  // Disable window/docking menu (that one that appears instead of the collapse button)
     ImGuiDockNodeFlags_NoCloseButton            = 1 << 15,  // Local, Saved  //
+    ImGuiDockNodeFlags_NoDocking                = 1 << 16,  // Local, Saved  // Disable any form of docking in this dockspace or individual node. (On a whole dockspace, this pretty much defeat the purpose of using a dockspace at all). Note: when turned on, existing docked nodes will be preserved.
     ImGuiDockNodeFlags_SharedFlagsInheritMask_  = ~0,
-    ImGuiDockNodeFlags_LocalFlagsMask_          = ImGuiDockNodeFlags_NoSplit | ImGuiDockNodeFlags_NoResize | ImGuiDockNodeFlags_AutoHideTabBar | ImGuiDockNodeFlags_DockSpace | ImGuiDockNodeFlags_CentralNode | ImGuiDockNodeFlags_NoTabBar | ImGuiDockNodeFlags_HiddenTabBar | ImGuiDockNodeFlags_NoWindowMenuButton | ImGuiDockNodeFlags_NoCloseButton,
+    ImGuiDockNodeFlags_LocalFlagsMask_          = ImGuiDockNodeFlags_NoSplit | ImGuiDockNodeFlags_NoResize | ImGuiDockNodeFlags_AutoHideTabBar | ImGuiDockNodeFlags_DockSpace | ImGuiDockNodeFlags_CentralNode | ImGuiDockNodeFlags_NoTabBar | ImGuiDockNodeFlags_HiddenTabBar | ImGuiDockNodeFlags_NoWindowMenuButton | ImGuiDockNodeFlags_NoCloseButton | ImGuiDockNodeFlags_NoDocking,
     ImGuiDockNodeFlags_LocalFlagsTransferMask_  = ImGuiDockNodeFlags_LocalFlagsMask_ & ~ImGuiDockNodeFlags_DockSpace,  // When splitting those flags are moved to the inheriting child, never duplicated
-    ImGuiDockNodeFlags_SavedFlagsMask_          = ImGuiDockNodeFlags_NoResize | ImGuiDockNodeFlags_DockSpace | ImGuiDockNodeFlags_CentralNode | ImGuiDockNodeFlags_NoTabBar | ImGuiDockNodeFlags_HiddenTabBar | ImGuiDockNodeFlags_NoWindowMenuButton | ImGuiDockNodeFlags_NoCloseButton
+    ImGuiDockNodeFlags_SavedFlagsMask_          = ImGuiDockNodeFlags_NoResize | ImGuiDockNodeFlags_DockSpace | ImGuiDockNodeFlags_CentralNode | ImGuiDockNodeFlags_NoTabBar | ImGuiDockNodeFlags_HiddenTabBar | ImGuiDockNodeFlags_NoWindowMenuButton | ImGuiDockNodeFlags_NoCloseButton | ImGuiDockNodeFlags_NoDocking
 };
 
 // Store the source authority (dock node vs window) of a field