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TabBar: Internals: added TabItemIsContentsAppearing() and reworked 50ae760. (#9581)

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ocornut 2026-10-27 16:27:10 +01:00
parent 50ae760fce
commit 1069a952e0
2 changed files with 16 additions and 12 deletions
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3
imgui_internal.h
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@ -2983,7 +2983,7 @@ struct IMGUI_API ImGuiTabBar
ImS8 BeginCount;
bool WantLayout;
bool VisibleTabWasSubmitted;
bool VisibleTabContentsJustAppeared;
bool LastTabItemContentsAppearing;
bool TabsAddedNew; // Set to true when a new tab item or button has been added to the tab bar during last frame
bool ScrollButtonEnabled;
ImS16 TabsActiveCount; // Number of tabs submitted this frame.
@ -3778,6 +3778,7 @@ namespace ImGui
IMGUI_API void TabBarQueueReorderFromMousePos(ImGuiTabBar* tab_bar, ImGuiTabItem* tab, ImVec2 mouse_pos);
IMGUI_API bool TabBarProcessReorder(ImGuiTabBar* tab_bar);
IMGUI_API bool TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open, ImGuiTabItemFlags flags, ImGuiWindow* docked_window);
IMGUI_API bool TabItemIsContentsAppearing();
IMGUI_API void TabItemSpacing(const char* str_id, ImGuiTabItemFlags flags, float width);
IMGUI_API ImVec2 TabItemCalcSize(const char* label, bool has_close_button_or_unsaved_marker);
IMGUI_API ImVec2 TabItemCalcSize(ImGuiWindow* window);

25
imgui_widgets.cpp
View File

@ -10323,7 +10323,7 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
// Lock in visible tab
tab_bar->VisibleTabContentsId = tab_bar->SelectedTabId;
tab_bar->VisibleTabWasSubmitted = tab_bar->VisibleTabContentsJustAppeared = false;
tab_bar->VisibleTabWasSubmitted = tab_bar->LastTabItemContentsAppearing = false;
// Apply request requests
if (scroll_to_tab_id != 0)
@ -10752,6 +10752,12 @@ void ImGui::EndTabItem()
PopID();
}
bool ImGui::TabItemIsContentsAppearing()
{
ImGuiContext& g = *GImGui;
return g.CurrentTabBar->LastTabItemContentsAppearing;
}
bool ImGui::TabItemButton(const char* label, ImGuiTabItemFlags flags)
{
ImGuiContext& g = *GImGui;
@ -10863,20 +10869,17 @@ bool ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
TabBarQueueFocus(tab_bar, tab);
}
// On the very first frame of a tab bar we let first tab contents be visible to minimize appearing glitches
if (tab_bar->VisibleTabContentsId == 0 && tab_bar->SelectedTabId == 0 && tab_bar_appearing)
if (tab_bar->Tabs.Size == 1 && !(tab_bar->Flags & ImGuiTabBarFlags_AutoSelectNewTabs))
tab_bar->VisibleTabContentsId = id;
// Lock visibility
// (Note: tab_contents_visible != tab_selected... because Ctrl+Tab operations may preview some tabs without selecting them!)
bool tab_contents_visible = (tab_bar->VisibleTabContentsId == id);
// On the very first frame of a tab bar we let first tab contents be visible to minimize appearing glitches
if (!tab_contents_visible && tab_bar->SelectedTabId == 0 && tab_bar_appearing)
if (tab_bar->Tabs.Size == 1 && !(tab_bar->Flags & ImGuiTabBarFlags_AutoSelectNewTabs))
tab_contents_visible = true;
const bool tab_contents_visible = (tab_bar->VisibleTabContentsId == id);
if (tab_contents_visible)
{
tab_bar->VisibleTabWasSubmitted = true;
tab_bar->VisibleTabContentsJustAppeared = tab_contents_visible && !tab->ContentsIsVisible;
}
tab_bar->LastTabItemContentsAppearing = tab_contents_visible && !tab->ContentsIsVisible;
tab->ContentsIsVisible = tab_contents_visible;
// Note that tab_is_new is not necessarily the same as tab_appearing! When a tab bar stops being submitted