@@ -4881,6 +4881,156 @@ static void ShowDemoWindowLayout()
48814881
48824882 ImGui::TreePop();
48834883 }
4884+
4885+ #if IMGUI_HAS_STACK_LAYOUT
4886+ IMGUI_DEMO_MARKER("Layout/Stack Layout");
4887+ if (ImGui::TreeNode("Stack Layout"))
4888+ {
4889+ static bool widget_a = true, widget_b = true, widget_c = true;
4890+ static bool spring_a = true, spring_ab = true, spring_bc = true, spring_c = true;
4891+ static bool minimize_width = false, minimize_height = true;
4892+ static bool horizontal = true, draw_springs = true;
4893+ static ImVec2 item_spacing = ImGui::GetStyle().ItemSpacing;
4894+ static float a_c_spring_weight = 0.0f;
4895+ static float ab_spring_weight = 0.5f;
4896+ static float alignment = 0.5f;
4897+
4898+ struct funcs
4899+ {
4900+ static void VisibleSpring(float spring_weight)
4901+ {
4902+ ImGui::Spring(spring_weight);
4903+ if (!draw_springs)
4904+ return;
4905+
4906+ ImVec2 rect_min = ImGui::GetItemRectMin();
4907+ ImVec2 rect_max = ImGui::GetItemRectMax();
4908+
4909+ ImVec2 rect_size = ImGui::GetItemRectSize();
4910+ if (rect_size.x <= 0.0f && rect_size.y <= 0.0f)
4911+ return;
4912+
4913+ // Draw zig-zag
4914+ float width = 0.0f, spacing = 0.0f;
4915+ ImVec2 direction, origin;
4916+ ImVec2 spacing_min, spring_max;
4917+
4918+ if (horizontal)
4919+ {
4920+ spacing = floorf(item_spacing.x);
4921+ width = rect_size.x - spacing;
4922+ origin = ImVec2(floorf(rect_min.x), floorf(rect_min.y + (rect_max.y - rect_min.y) / 2));
4923+ direction = ImVec2(1.0f, 0.0f);
4924+ spring_max = ImVec2(rect_min.x + width, rect_max.y);
4925+ spacing_min = ImVec2(rect_min.x + width, rect_min.y);
4926+ }
4927+ else
4928+ {
4929+ spacing = floorf(item_spacing.y);
4930+ width = rect_size.y - spacing;
4931+ origin = ImVec2(floorf(rect_min.x + (rect_max.x - rect_min.x) / 2), floorf(rect_min.y));
4932+ direction = ImVec2(0.0f, 1.0f);
4933+ spring_max = ImVec2(rect_max.x, rect_min.y + width);
4934+ spacing_min = ImVec2(rect_min.x, rect_min.y + width);
4935+ }
4936+
4937+ if (spring_weight <= 0.0f && spacing <= 0.0f)
4938+ return;
4939+
4940+ ImDrawList* draw_list = ImGui::GetWindowDrawList();
4941+
4942+ draw_list->PushClipRect(rect_min, rect_max, true);
4943+
4944+ draw_list->AddRectFilled(rect_min, spring_max, ImColor(80, 20, 80));
4945+ draw_list->AddRectFilled(spacing_min, rect_max, ImColor(80, 20, 20));
4946+
4947+ const float zig_zag_size = 3;
4948+ ImVec2 normal = ImVec2(-direction.y, direction.x);
4949+
4950+ draw_list->PathClear();
4951+ origin.x += 0.5f;
4952+ origin.y += 0.5f;
4953+ draw_list->PathLineTo(origin);
4954+ for (float x = zig_zag_size * 0.5f; x <= width; x += zig_zag_size)
4955+ {
4956+ ImVec2 p;
4957+ p.x = origin.x + direction.x * x + normal.x * zig_zag_size;
4958+ p.y = origin.y + direction.y * x + normal.y * zig_zag_size;
4959+ draw_list->PathLineTo(p);
4960+ normal = ImVec2(-normal.x, -normal.y);
4961+ }
4962+ draw_list->PathStroke(ImColor(255, 255, 255, 190), false, 1.0f);
4963+
4964+ draw_list->PopClipRect();
4965+ }
4966+ };
4967+
4968+ ImGui::Checkbox("Widget A", &widget_a); ImGui::SameLine();
4969+ ImGui::Checkbox("Widget B", &widget_b); ImGui::SameLine();
4970+ ImGui::Checkbox("Widget C", &widget_c);
4971+ ImGui::Checkbox("Spring A", &spring_a); ImGui::SameLine();
4972+ ImGui::Checkbox("Spring AB", &spring_ab); ImGui::SameLine();
4973+ ImGui::Checkbox("Spring BC", &spring_bc); ImGui::SameLine();
4974+ ImGui::Checkbox("Spring C", &spring_c);
4975+ ImGui::Checkbox("Horizontal", &horizontal); ImGui::SameLine();
4976+ ImGui::Checkbox("Minimize Width", &minimize_width); ImGui::SameLine();
4977+ ImGui::Checkbox("Minimize Height", &minimize_height);
4978+ ImGui::Checkbox("Draw Springs", &draw_springs); ImGui::SameLine();
4979+ ImGui::TextUnformatted(" "); ImGui::SameLine();
4980+ ImGui::ColorButton("- Spring", ImColor(80, 20, 80), ImGuiColorEditFlags_NoTooltip | ImGuiColorEditFlags_NoPicker); ImGui::SameLine();
4981+ ImGui::TextUnformatted("Spring"); ImGui::SameLine();
4982+ ImGui::TextUnformatted(" "); ImGui::SameLine();
4983+ ImGui::ColorButton("- Spacing", ImColor(80, 20, 20), ImGuiColorEditFlags_NoTooltip | ImGuiColorEditFlags_NoPicker); ImGui::SameLine();
4984+ ImGui::TextUnformatted("Item Spacing");
4985+ ImGui::DragFloat("Item Spacing", horizontal ? &item_spacing.x : &item_spacing.y, 0.1f, 0.0f, 50.0f);
4986+ ImGui::DragFloat("A & C Spring Weight", &a_c_spring_weight, 0.002f, 0.0f, 1.0f);
4987+ ImGui::DragFloat("AB Spring Weight", &ab_spring_weight, 0.002f, 0.0f, 1.0f);
4988+ if (ImGui::IsItemHovered()) ImGui::SetTooltip("BC Spring Weight = 1 - AB Spring Weight");
4989+ ImGui::DragFloat("Minor Axis Alignment", &alignment, 0.002f, 0.0f, 1.0f);
4990+ if (ImGui::IsItemHovered()) ImGui::SetTooltip("This is vertical alignment for horizontal layouts and horizontal alignment for vertical layouts.");
4991+ ImGui::Text("Layout widgets:");
4992+ ImGui::Text("| Spring A | Widget A | Spring AB | Widget B | Spring BC | Widget C | Spring C |");
4993+
4994+ ImGui::Spacing();
4995+
4996+ ImVec2 widget_size;
4997+ widget_size.x = floorf(ImGui::GetContentRegionAvail().x / 4);
4998+ widget_size.y = horizontal ? floorf(widget_size.x / 3) : widget_size.x;
4999+
5000+ ImVec2 small_widget_size = widget_size;
5001+ if (horizontal)
5002+ small_widget_size.y = floorf(small_widget_size.y / 2);
5003+ else
5004+ small_widget_size.x = floorf(small_widget_size.x / 2);
5005+
5006+ ImVec2 layout_size = ImVec2(widget_size.x * 4, widget_size.y * 4);
5007+ if (minimize_width) layout_size.x = 0.0f;
5008+ if (minimize_height) layout_size.y = 0.0f;
5009+
5010+ // Minor axis alignment can be set by style or directly in BeginHorizontal/BeginVertical
5011+ // Example:
5012+ // ImGui::PushStyleVar(ImGuiStyleVar_LayoutAlign, alignment);
5013+
5014+ ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(floorf(item_spacing.x), floorf(item_spacing.y)));
5015+
5016+ if (horizontal) { ImGui::BeginHorizontal("h1", layout_size, alignment); } else { ImGui::BeginVertical("v1", layout_size, alignment); }
5017+ if (spring_a) { funcs::VisibleSpring(a_c_spring_weight); }
5018+ if (widget_a) { ImGui::Button("Widget A", widget_size); }
5019+ if (spring_ab) { funcs::VisibleSpring(ab_spring_weight); }
5020+ if (widget_b) { ImGui::Button("Widget B", small_widget_size); }
5021+ if (spring_bc) { funcs::VisibleSpring(1.0f - ab_spring_weight); }
5022+ if (widget_c) { ImGui::Button("Widget C", widget_size); }
5023+ if (spring_c) { funcs::VisibleSpring(a_c_spring_weight); }
5024+ if (horizontal) { ImGui::EndHorizontal(); } else { ImGui::EndVertical(); }
5025+
5026+ ImGui::PopStyleVar();
5027+
5028+ ImDrawList* draw_list = ImGui::GetWindowDrawList();
5029+ draw_list->AddRect(ImGui::GetItemRectMin(), ImGui::GetItemRectMax(), ImGui::GetColorU32(ImGuiCol_Border));
5030+
5031+ ImGui::TreePop();
5032+ }
5033+ #endif // IMGUI_HAS_STACK_LAYOUT
48845034}
48855035
48865036//-----------------------------------------------------------------------------
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