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Windows: clarify/simplify background rendering: alpha should always be zero for DockNodeHost windows. (#2522)

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Amend b16f738d04 which AFAIK misleadingly added ImGuiWindowFlags_DockNodeHost tests in there.
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ocornut
2026-01-29 14:05:32 +01:00
parent 63e9fbc265
commit a6598f6fdb
1 changed files with 12 additions and 7 deletions
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19
imgui.cpp
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@@ -7479,15 +7479,20 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
bg_col = (bg_col & ~IM_COL32_A_MASK) | (IM_F32_TO_INT8_SAT(alpha) << IM_COL32_A_SHIFT);
}
// Render, for docked windows and host windows we ensure bg goes before decorations
// Render, for docked windows and host windows we ensure BG goes before decorations
if (window->DockIsActive)
window->DockNode->LastBgColor = bg_col;
ImDrawList* bg_draw_list = window->DockIsActive ? window->DockNode->HostWindow->DrawList : window->DrawList;
if (window->DockIsActive || (flags & ImGuiWindowFlags_DockNodeHost))
bg_draw_list->ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_BG);
bg_draw_list->AddRectFilled(window->Pos + ImVec2(0, window->TitleBarHeight), window->Pos + window->Size, bg_col, window_rounding, (flags & ImGuiWindowFlags_NoTitleBar) ? 0 : ImDrawFlags_RoundCornersBottom);
if (window->DockIsActive || (flags & ImGuiWindowFlags_DockNodeHost))
bg_draw_list->ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_FG);
if (flags & ImGuiWindowFlags_DockNodeHost)
bg_col = 0;
if (bg_col & IM_COL32_A_MASK)
{
ImDrawList* bg_draw_list = window->DockIsActive ? window->DockNode->HostWindow->DrawList : window->DrawList;
if (window->DockIsActive)
bg_draw_list->ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_BG);
bg_draw_list->AddRectFilled(window->Pos + ImVec2(0, window->TitleBarHeight), window->Pos + window->Size, bg_col, window_rounding, (flags & ImGuiWindowFlags_NoTitleBar) ? 0 : ImDrawFlags_RoundCornersBottom);
if (window->DockIsActive)
bg_draw_list->ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_FG);
}
}
if (window->DockIsActive)
window->DockNode->IsBgDrawnThisFrame = true;