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Windows: BeginChild(): fixed auto-fit calculation when using either (not both) ResizeX/ResizeY and double-clicking on a border. (#1710)

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Calculation incorrectly didn't always account for scrollbar as it assumed the other axis would also be auto-fit.
This commit is contained in:
ocornut
2024-05-24 12:31:40 +02:00
parent 374b9a7fb4
commit 29439bdd27
3 changed files with 15 additions and 3 deletions
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11
imgui.cpp
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@@ -5844,10 +5844,18 @@ static ImVec2 CalcWindowAutoFitSize(ImGuiWindow* window, const ImVec2& size_cont
ImVec2 size_max = ((window->Flags & ImGuiWindowFlags_ChildWindow) && !(window->Flags & ImGuiWindowFlags_Popup)) ? ImVec2(FLT_MAX, FLT_MAX) : ImGui::GetMainViewport()->WorkSize - style.DisplaySafeAreaPadding * 2.0f;
ImVec2 size_auto_fit = ImClamp(size_desired, size_min, size_max);
// FIXME: CalcWindowAutoFitSize() doesn't take into account that only one axis may be auto-fit when calculating scrollbars,
// we may need to compute/store three variants of size_auto_fit, for x/y/xy.
// Here we implement a workaround for child windows only, but a full solution would apply to normal windows as well:
if ((window->ChildFlags & ImGuiChildFlags_ResizeX) && !(window->ChildFlags & ImGuiChildFlags_ResizeY))
size_auto_fit.y = window->SizeFull.y;
else if (!(window->ChildFlags & ImGuiChildFlags_ResizeX) && (window->ChildFlags & ImGuiChildFlags_ResizeY))
size_auto_fit.x = window->SizeFull.x;
// When the window cannot fit all contents (either because of constraints, either because screen is too small),
// we are growing the size on the other axis to compensate for expected scrollbar. FIXME: Might turn bigger than ViewportSize-WindowPadding.
ImVec2 size_auto_fit_after_constraint = CalcWindowSizeAfterConstraint(window, size_auto_fit);
bool will_have_scrollbar_x = (size_auto_fit_after_constraint.x - size_pad.x - decoration_w_without_scrollbars < size_contents.x && !(window->Flags & ImGuiWindowFlags_NoScrollbar) && (window->Flags & ImGuiWindowFlags_HorizontalScrollbar)) || (window->Flags & ImGuiWindowFlags_AlwaysHorizontalScrollbar);
bool will_have_scrollbar_x = (size_auto_fit_after_constraint.x - size_pad.x - decoration_w_without_scrollbars < size_contents.x && !(window->Flags & ImGuiWindowFlags_NoScrollbar) && (window->Flags & ImGuiWindowFlags_HorizontalScrollbar)) || (window->Flags & ImGuiWindowFlags_AlwaysHorizontalScrollbar);
bool will_have_scrollbar_y = (size_auto_fit_after_constraint.y - size_pad.y - decoration_h_without_scrollbars < size_contents.y && !(window->Flags & ImGuiWindowFlags_NoScrollbar)) || (window->Flags & ImGuiWindowFlags_AlwaysVerticalScrollbar);
if (will_have_scrollbar_x)
size_auto_fit.y += style.ScrollbarSize;
@@ -6049,6 +6057,7 @@ static int ImGui::UpdateWindowManualResize(ImGuiWindow* window, const ImVec2& si
if (held && g.IO.MouseDoubleClicked[0])
{
// Double-clicking bottom or right border auto-fit on this axis
// FIXME: CalcWindowAutoFitSize() doesn't take into account that only one side may be auto-fit when calculating scrollbars.
// FIXME: Support top and right borders: rework CalcResizePosSizeFromAnyCorner() to be reusable in both cases.
if (border_n == 1 || border_n == 3) // Right and bottom border
{