Function DemoWindowWidgetsSelectionAndMultiSelect

src/imgui/imgui_demo.cpp:2643–3376

};

static void DemoWindowWidgetsSelectionAndMultiSelect(ImGuiDemoWindowData* demo_data)
{
    IMGUI_DEMO_MARKER("Widgets/Selection State & Multi-Select");
    if (ImGui::TreeNode("Selection State & Multi-Select"))
    {
        HelpMarker("Selections can be built using Selectable(), TreeNode() or other widgets. Selection state is owned by application code/data.");

        // Without any fancy API: manage single-selection yourself.
        IMGUI_DEMO_MARKER("Widgets/Selection State/Single-Select");
        if (ImGui::TreeNode("Single-Select"))
        {
            static int selected = -1;
            for (int n = 0; n < 5; n++)
            {
                char buf[32];
                sprintf(buf, "Object %d", n);
                if (ImGui::Selectable(buf, selected == n))
                    selected = n;
            }
            ImGui::TreePop();
        }

        // Demonstrate implementation a most-basic form of multi-selection manually
        // This doesn't support the SHIFT modifier which requires BeginMultiSelect()!
        IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select (manual/simplified, without BeginMultiSelect)");
        if (ImGui::TreeNode("Multi-Select (manual/simplified, without BeginMultiSelect)"))
        {
            HelpMarker("Hold CTRL and click to select multiple items.");
            static bool selection[5] = { false, false, false, false, false };
            for (int n = 0; n < 5; n++)
            {
                char buf[32];
                sprintf(buf, "Object %d", n);
                if (ImGui::Selectable(buf, selection[n]))
                {
                    if (!ImGui::GetIO().KeyCtrl) // Clear selection when CTRL is not held
                        memset(selection, 0, sizeof(selection));
                    selection[n] ^= 1; // Toggle current item
                }
            }
            ImGui::TreePop();
        }

        // Demonstrate handling proper multi-selection using the BeginMultiSelect/EndMultiSelect API.
        // SHIFT+Click w/ CTRL and other standard features are supported.
        // We use the ImGuiSelectionBasicStorage helper which you may freely reimplement.
        IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select");
        if (ImGui::TreeNode("Multi-Select"))
        {
            ImGui::Text("Supported features:");
            ImGui::BulletText("Keyboard navigation (arrows, page up/down, home/end, space).");
            ImGui::BulletText("Ctrl modifier to preserve and toggle selection.");
            ImGui::BulletText("Shift modifier for range selection.");
            ImGui::BulletText("CTRL+A to select all.");
            ImGui::BulletText("Escape to clear selection.");
            ImGui::BulletText("Click and drag to box-select.");
            ImGui::Text("Tip: Use 'Demo->Tools->Debug Log->Selection' to see selection requests as they happen.");