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TabBar: feed desired width (sum of unclipped tabs width) into layout system to allow for auto-resize. (#2768)

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Before 1.71 tab bars fed the sum of current width which created feedback loops in certain situations. Amend f95c77eeea.
This commit is contained in:
omar
2019-08-29 14:46:02 +02:00
parent f8d3d8d7f5
commit 3f99890f40
4 changed files with 14 additions and 7 deletions
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13
imgui_widgets.cpp
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@ -6290,8 +6290,8 @@ ImGuiTabBar::ImGuiTabBar()
ID = 0;
SelectedTabId = NextSelectedTabId = VisibleTabId = 0;
CurrFrameVisible = PrevFrameVisible = -1;
ContentsHeight = 0.0f;
OffsetMax = OffsetNextTab = 0.0f;
LastTabContentHeight = 0.0f;
OffsetMax = OffsetMaxIdeal = OffsetNextTab = 0.0f;
ScrollingAnim = ScrollingTarget = ScrollingTargetDistToVisibility = ScrollingSpeed = 0.0f;
Flags = ImGuiTabBarFlags_None;
ReorderRequestTabId = 0;
@ -6373,7 +6373,7 @@ bool ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImG
tab_bar->FramePadding = g.Style.FramePadding;
// Layout
ItemSize(ImVec2(0.0f /*tab_bar->OffsetMax*/, tab_bar->BarRect.GetHeight())); // Don't feed width back
ItemSize(ImVec2(tab_bar->OffsetMaxIdeal, tab_bar->BarRect.GetHeight()));
window->DC.CursorPos.x = tab_bar->BarRect.Min.x;
// Draw separator
@ -6406,9 +6406,9 @@ void ImGui::EndTabBar()
// Restore the last visible height if no tab is visible, this reduce vertical flicker/movement when a tabs gets removed without calling SetTabItemClosed().
const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
if (tab_bar->VisibleTabWasSubmitted || tab_bar->VisibleTabId == 0 || tab_bar_appearing)
tab_bar->ContentsHeight = ImMax(window->DC.CursorPos.y - tab_bar->BarRect.Max.y, 0.0f);
tab_bar->LastTabContentHeight = ImMax(window->DC.CursorPos.y - tab_bar->BarRect.Max.y, 0.0f);
else
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->ContentsHeight;
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->LastTabContentHeight;
if ((tab_bar->Flags & ImGuiTabBarFlags_DockNode) == 0)
PopID();
@ -6532,6 +6532,7 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
// Layout all active tabs
float offset_x = initial_offset_x;
float offset_x_ideal = offset_x;
tab_bar->OffsetNextTab = offset_x; // This is used by non-reorderable tab bar where the submission order is always honored.
for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
{
@ -6540,8 +6541,10 @@ static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
if (scroll_track_selected_tab_id == 0 && g.NavJustMovedToId == tab->ID)
scroll_track_selected_tab_id = tab->ID;
offset_x += tab->Width + g.Style.ItemInnerSpacing.x;
offset_x_ideal += tab->WidthContents + g.Style.ItemInnerSpacing.x;
}
tab_bar->OffsetMax = ImMax(offset_x - g.Style.ItemInnerSpacing.x, 0.0f);
tab_bar->OffsetMaxIdeal = ImMax(offset_x_ideal - g.Style.ItemInnerSpacing.x, 0.0f);
// Horizontal scrolling buttons
const bool scrolling_buttons = (tab_bar->OffsetMax > tab_bar->BarRect.GetWidth() && tab_bar->Tabs.Size > 1) && !(tab_bar->Flags & ImGuiTabBarFlags_NoTabListScrollingButtons) && (tab_bar->Flags & ImGuiTabBarFlags_FittingPolicyScroll);