Toggling collapsing headers

[Sandwich4780]

Version/Branch of Dear ImGui:

Version 1.90.4 WIP

Back-ends:

imgui_impl_win32.cpp

Compiler, OS:

Windows 10

Full config/build information:

No response

Details:

Is there a way to open/close collapsing headers with other mouse buttons? I'm trying to toggle a collapsing header with right-click but I can't figure out any way to do it. Maybe in the future there could be some sort of field/flag for using other mouse buttons.

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

No response

[PathogenDavid]

Could you explain why you want this behavior? It sounds very non-standard.

There is no built-in way to accomplish this, but you could tweak TreeNodeBehavior to pass ImGuiButtonFlags_MouseButtonRight to ButtonBehavior here:

imgui/imgui_widgets.cpp

Line 6297 in 277ae93

bool pressed = ButtonBehavior(interact_bb, id, &hovered, &held, button_flags);

You'd probably want to add your own flag to ImGuiTreeNodeFlags_ to enable this behavior since TreeNodeBehavior affects more than just ImGui::CollapsingHeader.

[Sandwich4780]

Could you explain why you want this behavior? It sounds very non-standard.

There is no built-in way to accomplish this, but you could tweak TreeNodeBehavior to pass ImGuiButtonFlags_MouseButtonRight to ButtonBehavior here:

imgui/imgui_widgets.cpp

Line 6297 in 277ae93

bool pressed = ButtonBehavior(interact_bb, id, &hovered, &held, button_flags);

You'd probably want to add your own flag to ImGuiTreeNodeFlags_ to enable this behavior since TreeNodeBehavior affects more than just ImGui::CollapsingHeader.

I want it to behave like that so I can have both a checkbox and a header in one. I'll try your suggested method but anyways ty for the help

[PathogenDavid]

I want it to behave like that so I can have both a checkbox and a header in one.

In that case you might actually be better served by using ImGuiTreeNodeFlags_AllowOverlap and ImGui::SameLine to put a checkbox on the header. Something like this:

static bool CheckableCollapsingHeader(const char* label, bool* v, ImGuiTreeNodeFlags flags = 0)
{
    ImGui::PushID(label);
    bool is_open = ImGui::CollapsingHeader("##CollapsingHeader", flags | ImGuiTreeNodeFlags_AllowOverlap);
    ImGui::SameLine();
    ImGui::Checkbox("##Checkbox", v);
    ImGui::SameLine();
    ImGui::Text("Header"); // (Label submitted as text so the user can click it to toggle the header instead of the checkbox)
    ImGui::PopID();
    return is_open;
}

static void GH7349()
{
    ImGui::Begin("GH-7349");
    static bool toggle;
    if (CheckableCollapsingHeader("Header", &toggle))
    {
        ImGui::Text("Expanded!");
    }

    ImGui::Text("Header %s checked!", toggle ? "is" : "is not");
    ImGui::End();
}

Here's what that looks like:

(Linking to related issues: #6294 #2396)

[Sandwich4780]

I want it to behave like that so I can have both a checkbox and a header in one.

In that case you might actually be better served by using ImGuiTreeNodeFlags_AllowOverlap and ImGui::SameLine to put a checkbox on the header. Something like this:

static bool CheckableCollapsingHeader(const char* label, bool* v, ImGuiTreeNodeFlags flags = 0)
{
    ImGui::PushID(label);
    bool is_open = ImGui::CollapsingHeader("##CollapsingHeader", flags | ImGuiTreeNodeFlags_AllowOverlap);
    ImGui::SameLine();
    ImGui::Checkbox("##Checkbox", v);
    ImGui::SameLine();
    ImGui::Text("Header"); // (Label submitted as text so the user can click it to toggle the header instead of the checkbox)
    ImGui::PopID();
    return is_open;
}

static void GH7349()
{
    ImGui::Begin("GH-7349");
    static bool toggle;
    if (CheckableCollapsingHeader("Header", &toggle))
    {
        ImGui::Text("Expanded!");
    }

    ImGui::Text("Header %s checked!", toggle ? "is" : "is not");
    ImGui::End();
}

Here's what that looks like:

(Linking to related issues: #6294 #2396)

Oh this will work pretty good, I’ll do this instead. Thank you for the help