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TabBar: made a change to that declared ideal width (for auto-resize) won't lag by an extra frame.

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Vaguely relate to underlying (uncommited) work for #3291
This commit is contained in:
omar 2020-08-06 16:35:29 +02:00
parent 8074b49148
commit b15b25bccd
1 changed files with 8 additions and 3 deletions
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11
imgui_widgets.cpp
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@ -6657,9 +6657,9 @@ bool ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImG
tab_bar->CurrFrameVisible = g.FrameCount;
tab_bar->FramePadding = g.Style.FramePadding;
// Layout
ItemSize(ImVec2(tab_bar->OffsetMaxIdeal, tab_bar->BarRect.GetHeight()), tab_bar->FramePadding.y);
// Set cursor pos in a way which only be used in the off-chance the user erroneously submits item before BeginTabItem(): items will overlap
window->DC.CursorPos.x = tab_bar->BarRect.Min.x;
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + g.Style.ItemSpacing.y;
// Draw separator
const ImU32 col = GetColorU32((flags & ImGuiTabBarFlags_IsFocused) ? ImGuiCol_TabActive : ImGuiCol_TabUnfocusedActive);
@ -6685,7 +6685,7 @@ void ImGui::EndTabBar()
IM_ASSERT_USER_ERROR(tab_bar != NULL, "Mismatched BeginTabBar()/EndTabBar()!");
return;
}
if (tab_bar->WantLayout)
if (tab_bar->WantLayout) // Fallback in case no TabItem have been submitted
TabBarLayout(tab_bar);
// Restore the last visible height if no tab is visible, this reduce vertical flicker/movement when a tabs gets removed without calling SetTabItemClosed().
@ -6871,6 +6871,11 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
// Clear name buffers
if ((tab_bar->Flags & ImGuiTabBarFlags_DockNode) == 0)
tab_bar->TabsNames.Buf.resize(0);
// Actual layout in host window (we don't do it in BeginTabBar() so as not to waste an extra frame)
ImGuiWindow* window = g.CurrentWindow;
window->DC.CursorPos = tab_bar->BarRect.Min;
ItemSize(ImVec2(tab_bar->OffsetMaxIdeal, tab_bar->BarRect.GetHeight()), tab_bar->FramePadding.y);
}
// Dockables uses Name/ID in the global namespace. Non-dockable items use the ID stack.