Set open state of tree node

[dgregorius]

Is there a way to get to the state of a tree node and force it to open?

I am implementing a simple file explorer in ImGui (think Unity Project Widget). When I double click on a folder in the file view I need to change the state of the directory tree. What is the recommended way to do this? ImGui::SetNextItemOpen() does not help here. I also would very much prefer to NOT maintain my own tree state as this seems redundant and error prone.

[ocornut]

Hello,

You are not specifying why ImGui::SetNextItemOpen does not help there.

You can use GetStateStorage()->GetInt(ImGuiID key, int default_val = 0) with the ID of the tree node or correspondingly the SetInt() function.

The only thing is that this storage will ignore the SetNextItemOpen() data and the ImGuiTreeNodeFlags_DefaultOpen flag (the later correspond to altering the default value of GetInt() above.

You can use ImGui::TreeNodeBehaviorIsOpen() from imgui_internal.h as a getter to handle those two cases if you need them. Also see how the function is implemented as a reference.

PS: Please fill in the request issue template when opening new issues. Thank you.

[dgregorius]

Thanks, Omar. I thought about this more and I can indeed use ImGui::SetNextItemOpen.