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Add a feature to draw a border around the selected window #9129

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Add a feature to draw a border around the selected window #9129

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4832e45
Add a feature to draw a border around the selected window
TaiseiHamaya Dec 18, 2025
e3a70f3
Renamed ImGuiCol_BorderSelected to ImGuiCol_WindowBorderSelected.
TaiseiHamaya Dec 22, 2025
d55014f
Fixed a bug where the condition for determining whether the window is…
TaiseiHamaya Dec 22, 2025
49dd13f
Fix: Corrected an issue where borders were rendered incorrectly when …
TaiseiHamaya Jan 29, 2026
35a118f
Fix an issue where the detection was incorrect when opening a new win…
TaiseiHamaya Feb 6, 2026
8475471
Refactoring: Replaced 'RenderWindowOuterSingleBorder' with 'AddRect'.
TaiseiHamaya May 13, 2026
4c93eaa
Fix: Check for border rendering when the window is set to 'NoInputs' …
TaiseiHamaya May 13, 2026
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25 changes: 25 additions & 0 deletions imgui.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3761,6 +3761,7 @@ const char* ImGui::GetStyleColorName(ImGuiCol idx)
case ImGuiCol_ChildBg: return "ChildBg";
case ImGuiCol_PopupBg: return "PopupBg";
case ImGuiCol_Border: return "Border";
case ImGuiCol_WindowBorderSelected: return "WindowBorderSelected";
case ImGuiCol_BorderShadow: return "BorderShadow";
case ImGuiCol_FrameBg: return "FrameBg";
case ImGuiCol_FrameBgHovered: return "FrameBgHovered";
Expand Down Expand Up @@ -7544,6 +7545,30 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
// Borders (for dock node host they will be rendered over after the tab bar)
if (handle_borders_and_resize_grips && !window->DockNodeAsHost)
RenderWindowOuterBorders(window);

// Selected border
const float border_size = window->WindowBorderSize;
bool is_window_selected = border_size > 0.0f;
if (!(window->Flags & (ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Popup)))
{
// Regular window
if (!(window->Flags & (ImGuiWindowFlags_NoInputs | ImGuiWindowFlags_MenuBar)))
is_window_selected &= g.WindowsFocusOrder.back() == window;
else
is_window_selected = false;
}
else
{
// BeginPopup/BeginMenu
is_window_selected &= g.OpenPopupStack.back().Window == window && g.WindowsFocusOrder.back() == window->RootWindow;
}
// When docked, only show selected border if the dock node is focused
is_window_selected &= (!window->DockIsActive || window->DockNode->IsFocused);
if (is_window_selected)
{
const ImU32 border_selected_col = GetColorU32(ImGuiCol_WindowBorderSelected);
window->DrawList->AddRect(window->Pos, window->Pos + window->Size, border_selected_col, window_rounding, 0, border_size);
}
}
window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
}
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1 change: 1 addition & 0 deletions imgui.h
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Expand Up @@ -1809,6 +1809,7 @@ enum ImGuiCol_
ImGuiCol_Text,
ImGuiCol_TextDisabled,
ImGuiCol_WindowBg, // Background of normal windows
ImGuiCol_WindowBorderSelected, // border of selected normal windows
ImGuiCol_ChildBg, // Background of child windows
ImGuiCol_PopupBg, // Background of popups, menus, tooltips windows
ImGuiCol_Border,
Expand Down
3 changes: 3 additions & 0 deletions imgui_draw.cpp
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Expand Up @@ -189,6 +189,7 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
colors[ImGuiCol_Text] = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
colors[ImGuiCol_TextDisabled] = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
colors[ImGuiCol_WindowBg] = ImVec4(0.06f, 0.06f, 0.06f, 0.94f);
colors[ImGuiCol_WindowBorderSelected] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_ChildBg] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_PopupBg] = ImVec4(0.08f, 0.08f, 0.08f, 0.94f);
colors[ImGuiCol_Border] = ImVec4(0.43f, 0.43f, 0.50f, 0.50f);
Expand Down Expand Up @@ -258,6 +259,7 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
colors[ImGuiCol_Text] = ImVec4(0.90f, 0.90f, 0.90f, 1.00f);
colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
colors[ImGuiCol_WindowBg] = ImVec4(0.00f, 0.00f, 0.00f, 0.85f);
colors[ImGuiCol_WindowBorderSelected] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_ChildBg] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_PopupBg] = ImVec4(0.11f, 0.11f, 0.14f, 0.92f);
colors[ImGuiCol_Border] = ImVec4(0.50f, 0.50f, 0.50f, 0.50f);
Expand Down Expand Up @@ -328,6 +330,7 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
colors[ImGuiCol_Text] = ImVec4(0.00f, 0.00f, 0.00f, 1.00f);
colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
colors[ImGuiCol_WindowBg] = ImVec4(0.94f, 0.94f, 0.94f, 1.00f);
colors[ImGuiCol_WindowBorderSelected] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_ChildBg] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
colors[ImGuiCol_PopupBg] = ImVec4(1.00f, 1.00f, 1.00f, 0.98f);
colors[ImGuiCol_Border] = ImVec4(0.00f, 0.00f, 0.00f, 0.30f);
Expand Down