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Tab Bar: Made it possible to append to an existing tab bar by calling BeginTabBar()/EndTabBar() again.

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This commit is contained in:
ocornut 2020-10-14 18:34:33 +02:00
parent b1a18d82e3
commit f2f326024c
3 changed files with 23 additions and 10 deletions
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1
docs/CHANGELOG.txt
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@ -54,6 +54,7 @@ Breaking Changes:
Other Changes:
- Tab Bar: Made it possible to append to an existing tab bar by calling BeginTabBar()/EndTabBar() again.
- Docs: Split examples/README.txt into docs/BACKENDS.md and docs/EXAMPLES.md improved them.
- Docs: Consistently renamed all occurences of "binding" and "back-end" to "backend" in comments and docs.

6
imgui_internal.h
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@ -1754,7 +1754,8 @@ struct ImGuiTabBar
int CurrFrameVisible;
int PrevFrameVisible;
ImRect BarRect;
float LastTabContentHeight; // Record the height of contents submitted below the tab bar
float CurrTabsContentsHeight;
float PrevTabsContentsHeight; // Record the height of contents submitted below the tab bar
float WidthAllTabs; // Actual width of all tabs (locked during layout)
float WidthAllTabsIdeal; // Ideal width if all tabs were visible and not clipped
float ScrollingAnim;
@ -1770,8 +1771,9 @@ struct ImGuiTabBar
bool WantLayout;
bool VisibleTabWasSubmitted;
bool TabsAddedNew; // Set to true when a new tab item or button has been added to the tab bar during last frame
short LastTabItemIdx; // Index of last BeginTabItem() tab for use by EndTabItem()
short LastTabItemIdx; // Index of last BeginTabItem() tab for use by EndTabItem()
ImVec2 FramePadding; // style.FramePadding locked at the time of BeginTabBar()
ImVec2 TabsContentsMin;
ImGuiTextBuffer TabsNames; // For non-docking tab bar we re-append names in a contiguous buffer.
ImGuiTabBar();

26
imgui_widgets.cpp
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@ -6805,7 +6805,7 @@ ImGuiTabBar::ImGuiTabBar()
ID = 0;
SelectedTabId = NextSelectedTabId = VisibleTabId = 0;
CurrFrameVisible = PrevFrameVisible = -1;
LastTabContentHeight = 0.0f;
CurrTabsContentsHeight = PrevTabsContentsHeight = 0.0f;
WidthAllTabs = WidthAllTabsIdeal = 0.0f;
ScrollingAnim = ScrollingTarget = ScrollingTargetDistToVisibility = ScrollingSpeed = 0.0f;
ScrollingRectMinX = ScrollingRectMaxX = 0.0f;
@ -6877,10 +6877,10 @@ bool ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImG
g.CurrentTabBarStack.push_back(GetTabBarRefFromTabBar(tab_bar));
g.CurrentTabBar = tab_bar;
// Append with multiple BeginTabBar()/EndTabBar() pairs.
if (tab_bar->CurrFrameVisible == g.FrameCount)
{
//IMGUI_DEBUG_LOG("BeginTabBarEx already called this frame\n", g.FrameCount);
IM_ASSERT(0);
window->DC.CursorPos = tab_bar->TabsContentsMin;
return true;
}
@ -6899,12 +6899,15 @@ bool ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImG
tab_bar->WantLayout = true; // Layout will be done on the first call to ItemTab()
tab_bar->PrevFrameVisible = tab_bar->CurrFrameVisible;
tab_bar->CurrFrameVisible = g.FrameCount;
tab_bar->PrevTabsContentsHeight = tab_bar->CurrTabsContentsHeight;
tab_bar->CurrTabsContentsHeight = 0.0f;
tab_bar->FramePadding = g.Style.FramePadding;
tab_bar->TabsActiveCount = 0;
// 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;
tab_bar->TabsContentsMin.x = tab_bar->BarRect.Min.x;
tab_bar->TabsContentsMin.y = tab_bar->BarRect.Max.y + g.Style.ItemSpacing.y;
window->DC.CursorPos = tab_bar->TabsContentsMin;
// Draw separator
const ImU32 col = GetColorU32((flags & ImGuiTabBarFlags_IsFocused) ? ImGuiCol_TabActive : ImGuiCol_TabUnfocusedActive);
@ -6930,15 +6933,22 @@ void ImGui::EndTabBar()
IM_ASSERT_USER_ERROR(tab_bar != NULL, "Mismatched BeginTabBar()/EndTabBar()!");
return;
}
if (tab_bar->WantLayout) // Fallback in case no TabItem have been submitted
// Fallback in case no TabItem have been submitted
if (tab_bar->WantLayout)
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().
const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
if (tab_bar->VisibleTabWasSubmitted || tab_bar->VisibleTabId == 0 || tab_bar_appearing)
tab_bar->LastTabContentHeight = ImMax(window->DC.CursorPos.y - tab_bar->BarRect.Max.y, 0.0f);
{
tab_bar->CurrTabsContentsHeight = ImMax(window->DC.CursorPos.y - tab_bar->BarRect.Max.y, tab_bar->CurrTabsContentsHeight);
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->CurrTabsContentsHeight;
}
else
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->LastTabContentHeight;
{
window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->PrevTabsContentsHeight;
}
if ((tab_bar->Flags & ImGuiTabBarFlags_DockNode) == 0)
PopID();