This is called only once a frame before by the first call to ItemTab() The reason we're not calling it in BeginTabBar() is to leave a chance to the user to call the SetTabItemClosed() functions.
| 7657 | // This is called only once a frame before by the first call to ItemTab() |
| 7658 | // The reason we're not calling it in BeginTabBar() is to leave a chance to the user to call the SetTabItemClosed() functions. |
| 7659 | static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar) |
| 7660 | { |
| 7661 | ImGuiContext& g = *GImGui; |
| 7662 | tab_bar->WantLayout = false; |
| 7663 | |
| 7664 | // Garbage collect by compacting list |
| 7665 | // Detect if we need to sort out tab list (e.g. in rare case where a tab changed section) |
| 7666 | int tab_dst_n = 0; |
| 7667 | bool need_sort_by_section = false; |
| 7668 | ImGuiTabBarSection sections[3]; // Layout sections: Leading, Central, Trailing |
| 7669 | for (int tab_src_n = 0; tab_src_n < tab_bar->Tabs.Size; tab_src_n++) |
| 7670 | { |
| 7671 | ImGuiTabItem* tab = &tab_bar->Tabs[tab_src_n]; |
| 7672 | if (tab->LastFrameVisible < tab_bar->PrevFrameVisible || tab->WantClose) |
| 7673 | { |
| 7674 | // Remove tab |
| 7675 | if (tab_bar->VisibleTabId == tab->ID) { tab_bar->VisibleTabId = 0; } |
| 7676 | if (tab_bar->SelectedTabId == tab->ID) { tab_bar->SelectedTabId = 0; } |
| 7677 | if (tab_bar->NextSelectedTabId == tab->ID) { tab_bar->NextSelectedTabId = 0; } |
| 7678 | continue; |
| 7679 | } |
| 7680 | if (tab_dst_n != tab_src_n) |
| 7681 | tab_bar->Tabs[tab_dst_n] = tab_bar->Tabs[tab_src_n]; |
| 7682 | |
| 7683 | tab = &tab_bar->Tabs[tab_dst_n]; |
| 7684 | tab->IndexDuringLayout = (ImS16)tab_dst_n; |
| 7685 | |
| 7686 | // We will need sorting if tabs have changed section (e.g. moved from one of Leading/Central/Trailing to another) |
| 7687 | int curr_tab_section_n = TabItemGetSectionIdx(tab); |
| 7688 | if (tab_dst_n > 0) |
| 7689 | { |
| 7690 | ImGuiTabItem* prev_tab = &tab_bar->Tabs[tab_dst_n - 1]; |
| 7691 | int prev_tab_section_n = TabItemGetSectionIdx(prev_tab); |
| 7692 | if (curr_tab_section_n == 0 && prev_tab_section_n != 0) |
| 7693 | need_sort_by_section = true; |
| 7694 | if (prev_tab_section_n == 2 && curr_tab_section_n != 2) |
| 7695 | need_sort_by_section = true; |
| 7696 | } |
| 7697 | |
| 7698 | sections[curr_tab_section_n].TabCount++; |
| 7699 | tab_dst_n++; |
| 7700 | } |
| 7701 | if (tab_bar->Tabs.Size != tab_dst_n) |
| 7702 | tab_bar->Tabs.resize(tab_dst_n); |
| 7703 | |
| 7704 | if (need_sort_by_section) |
| 7705 | ImQsort(tab_bar->Tabs.Data, tab_bar->Tabs.Size, sizeof(ImGuiTabItem), TabItemComparerBySection); |
| 7706 | |
| 7707 | // Calculate spacing between sections |
| 7708 | sections[0].Spacing = sections[0].TabCount > 0 && (sections[1].TabCount + sections[2].TabCount) > 0 ? g.Style.ItemInnerSpacing.x : 0.0f; |
| 7709 | sections[1].Spacing = sections[1].TabCount > 0 && sections[2].TabCount > 0 ? g.Style.ItemInnerSpacing.x : 0.0f; |
| 7710 | |
| 7711 | // Setup next selected tab |
| 7712 | ImGuiID scroll_to_tab_id = 0; |
| 7713 | if (tab_bar->NextSelectedTabId) |
| 7714 | { |
| 7715 | tab_bar->SelectedTabId = tab_bar->NextSelectedTabId; |
| 7716 | tab_bar->NextSelectedTabId = 0; |
nothing calls this directly
no test coverage detected