Method UpdateManualResize

lib/imgui/imgui.cpp:4973–5093

Handle resize for: Resize Grips, Borders, Gamepad Return true when using auto-fit (double click on resize grip)

// Handle resize for: Resize Grips, Borders, Gamepad
// Return true when using auto-fit (double click on resize grip)
static bool ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_auto_fit, int* border_held, int resize_grip_count, ImU32 resize_grip_col[4])
{
    ImGuiContext& g = *GImGui;
    ImGuiWindowFlags flags = window->Flags;

    if ((flags & ImGuiWindowFlags_NoResize) || (flags & ImGuiWindowFlags_AlwaysAutoResize) || window->AutoFitFramesX > 0 || window->AutoFitFramesY > 0)
        return false;
    if (window->WasActive == false) // Early out to avoid running this code for e.g. an hidden implicit/fallback Debug window.
        return false;

    bool ret_auto_fit = false;
    const int resize_border_count = g.IO.ConfigWindowsResizeFromEdges ? 4 : 0;
    const float grip_draw_size = IM_FLOOR(ImMax(g.FontSize * 1.35f, window->WindowRounding + 1.0f + g.FontSize * 0.2f));
    const float grip_hover_inner_size = IM_FLOOR(grip_draw_size * 0.75f);
    const float grip_hover_outer_size = g.IO.ConfigWindowsResizeFromEdges ? WINDOWS_RESIZE_FROM_EDGES_HALF_THICKNESS : 0.0f;

    ImVec2 pos_target(FLT_MAX, FLT_MAX);
    ImVec2 size_target(FLT_MAX, FLT_MAX);

    // Resize grips and borders are on layer 1
    window->DC.NavLayerCurrent = ImGuiNavLayer_Menu;
    window->DC.NavLayerCurrentMask = (1 << ImGuiNavLayer_Menu);

    // Manual resize grips
    PushID("#RESIZE");
    for (int resize_grip_n = 0; resize_grip_n < resize_grip_count; resize_grip_n++)
    {
        const ImGuiResizeGripDef& grip = resize_grip_def[resize_grip_n];
        const ImVec2 corner = ImLerp(window->Pos, window->Pos + window->Size, grip.CornerPosN);

        // Using the FlattenChilds button flag we make the resize button accessible even if we are hovering over a child window
        ImRect resize_rect(corner - grip.InnerDir * grip_hover_outer_size, corner + grip.InnerDir * grip_hover_inner_size);
        if (resize_rect.Min.x > resize_rect.Max.x) ImSwap(resize_rect.Min.x, resize_rect.Max.x);
        if (resize_rect.Min.y > resize_rect.Max.y) ImSwap(resize_rect.Min.y, resize_rect.Max.y);
        bool hovered, held;
        ButtonBehavior(resize_rect, window->GetID(resize_grip_n), &hovered, &held, ImGuiButtonFlags_FlattenChildren | ImGuiButtonFlags_NoNavFocus);
        //GetForegroundDrawList(window)->AddRect(resize_rect.Min, resize_rect.Max, IM_COL32(255, 255, 0, 255));
        if (hovered || held)
            g.MouseCursor = (resize_grip_n & 1) ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;

        if (held && g.IO.MouseDoubleClicked[0] && resize_grip_n == 0)
        {
            // Manual auto-fit when double-clicking
            size_target = CalcWindowSizeAfterConstraint(window, size_auto_fit);
            ret_auto_fit = true;
            ClearActiveID();
        }
        else if (held)
        {
            // Resize from any of the four corners
            // We don't use an incremental MouseDelta but rather compute an absolute target size based on mouse position
            ImVec2 corner_target = g.IO.MousePos - g.ActiveIdClickOffset + ImLerp(grip.InnerDir * grip_hover_outer_size, grip.InnerDir * -grip_hover_inner_size, grip.CornerPosN); // Corner of the window corresponding to our corner grip
            CalcResizePosSizeFromAnyCorner(window, corner_target, grip.CornerPosN, &pos_target, &size_target);
        }
        if (resize_grip_n == 0 || held || hovered)
            resize_grip_col[resize_grip_n] = GetColorU32(held ? ImGuiCol_ResizeGripActive : hovered ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
    }
    for (int border_n = 0; border_n < resize_border_count; border_n++)