Function ShowDemoWindowPopups

lib/imgui/imgui_demo.cpp:2467–2695

}

static void ShowDemoWindowPopups()
{
    if (!ImGui::CollapsingHeader("Popups & Modal windows"))
        return;

    // The properties of popups windows are:
    // - They block normal mouse hovering detection outside them. (*)
    // - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
    // - Their visibility state (~bool) is held internally by Dear ImGui instead of being held by the programmer as we are used to with regular Begin() calls.
    //   User can manipulate the visibility state by calling OpenPopup().
    // (*) One can use IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) to bypass it and detect hovering even when normally blocked by a popup.
    // Those three properties are connected. The library needs to hold their visibility state because it can close popups at any time.

    // Typical use for regular windows:
    //   bool my_tool_is_active = false; if (ImGui::Button("Open")) my_tool_is_active = true; [...] if (my_tool_is_active) Begin("My Tool", &my_tool_is_active) { [...] } End();
    // Typical use for popups:
    //   if (ImGui::Button("Open")) ImGui::OpenPopup("MyPopup"); if (ImGui::BeginPopup("MyPopup") { [...] EndPopup(); }

    // With popups we have to go through a library call (here OpenPopup) to manipulate the visibility state.
    // This may be a bit confusing at first but it should quickly make sense. Follow on the examples below.

    if (ImGui::TreeNode("Popups"))
    {
        ImGui::TextWrapped("When a popup is active, it inhibits interacting with windows that are behind the popup. Clicking outside the popup closes it.");

        static int selected_fish = -1;
        const char* names[] = { "Bream", "Haddock", "Mackerel", "Pollock", "Tilefish" };
        static bool toggles[] = { true, false, false, false, false };

        // Simple selection popup
        // (If you want to show the current selection inside the Button itself, you may want to build a string using the "###" operator to preserve a constant ID with a variable label)
        if (ImGui::Button("Select.."))
            ImGui::OpenPopup("my_select_popup");
        ImGui::SameLine();
        ImGui::TextUnformatted(selected_fish == -1 ? "<None>" : names[selected_fish]);
        if (ImGui::BeginPopup("my_select_popup"))
        {
            ImGui::Text("Aquarium");
            ImGui::Separator();
            for (int i = 0; i < IM_ARRAYSIZE(names); i++)
                if (ImGui::Selectable(names[i]))
                    selected_fish = i;
            ImGui::EndPopup();
        }

        // Showing a menu with toggles
        if (ImGui::Button("Toggle.."))
            ImGui::OpenPopup("my_toggle_popup");
        if (ImGui::BeginPopup("my_toggle_popup"))
        {
            for (int i = 0; i < IM_ARRAYSIZE(names); i++)
                ImGui::MenuItem(names[i], "", &toggles[i]);
            if (ImGui::BeginMenu("Sub-menu"))
            {
                ImGui::MenuItem("Click me");
                ImGui::EndMenu();
            }