NoCollapse and NoTitleBar in docking

[thewoz]

Branch: docking

Sorry for the stupid question but I couldn't find the solution.
I'm trying not to render the elements circled in red and I can't do it.

I tried to do it this way but it doesn't work

`ImGui::Begin("MainWindow", NULL, ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoTitleBar);

ImGui::Begin("Left", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar);
ImGui::Begin("Right", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar);
ImGui::Begin("Down", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar);
`

[GamingMinds-DanielC]

It's not the window, but the dock space that you need to configure properly. Search for ImGuiDockNodeFlags_AutoHideTabBar in the demo sources.

[ocornut]

This and similar questions have been discussed in #5597 #4880 #3521 #3335

Essentially, the problem is that as multiple windows can be hosted by a docking-node, it isn't a correct default behavior that window apply their settings to parent node, as it would conflict if multiple windows were in that same node.

You can use this:

ImGuiWindowClass window_class;
window_class.DockNodeFlagsOverrideSet = ImGuiDockNodeFlags_NoTabBar;

ImGui::SetNextWindowClass(&window_class);
ImGui::Begin("Left", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar); ImGui::End();

ImGui::SetNextWindowClass(&window_class);
ImGui::Begin("Right", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar); ImGui::End();

ImGui::SetNextWindowClass(&window_class);
ImGui::Begin("Down", NULL, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar); ImGui::End();

However if you dock both of those windows together you won't see the tab bar...

Maybe a better solution for you is to use ImGuiDockNodeFlags_AutoHideTabBar instead of ImGuiDockNodeFlags_NoTabBar.

[thewoz]

Amazing it works perfectly!

[UFifty50]

How can I do the exact opposite of this?
i.e. ImGuiDockNodeFlags_NoTabBar prevents a window's tab bar from ever existing, how can I prevent the window's tab bar from being collapsed and make sure its always open?

[UFifty50]

How can I do the exact opposite of this? i.e. ImGuiDockNodeFlags_NoTabBar prevents a window's tab bar from ever existing, how can I prevent the window's tab bar from being collapsed and make sure its always open?

I've worked it out after reading through the DockNodeUpdateTabBar source.
If anyone else has this issue, here's how I fixed it:

ImGuiWindowClass winClass;
winClass.DockNodeFlagsOverrideSet = ImGuiDockNodeFlags_NoWindowMenuButton;

ImGui::SetNextWindowClass(&winClass);
ImGui::Begin("window");
...

pretty much the same as above, but using ImGuiDockNodeFlags_NoWindowMenuButton.