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Internals: Begin: update ->Hidden flags only on first begin of the frame. (ignore whitespace to see simple diff)

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This commit is contained in:
ocornut 2020-09-01 15:24:24 +02:00
parent ce230fc370
commit a456d17dfc
1 changed files with 31 additions and 26 deletions
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57
imgui.cpp
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@ -5248,6 +5248,7 @@ void ImGui::RenderWindowDecorations(ImGuiWindow* window, const ImRect& title_bar
ImGuiWindowFlags flags = window->Flags; ImGuiWindowFlags flags = window->Flags;
// Ensure that ScrollBar doesn't read last frame's SkipItems // Ensure that ScrollBar doesn't read last frame's SkipItems
IM_ASSERT(window->BeginCount == 0);
window->SkipItems = false; window->SkipItems = false;
// Draw window + handle manual resize // Draw window + handle manual resize
@ -6029,37 +6030,41 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
window->BeginCount++; window->BeginCount++;
g.NextWindowData.ClearFlags(); g.NextWindowData.ClearFlags();
if (flags & ImGuiWindowFlags_ChildWindow) // Update visibility
if (first_begin_of_the_frame)
{ {
// Child window can be out of sight and have "negative" clip windows. if (flags & ImGuiWindowFlags_ChildWindow)
// Mark them as collapsed so commands are skipped earlier (we can't manually collapse them because they have no title bar). {
IM_ASSERT((flags & ImGuiWindowFlags_NoTitleBar) != 0); // Child window can be out of sight and have "negative" clip windows.
if (!(flags & ImGuiWindowFlags_AlwaysAutoResize) && window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0) // Mark them as collapsed so commands are skipped earlier (we can't manually collapse them because they have no title bar).
if (window->OuterRectClipped.Min.x >= window->OuterRectClipped.Max.x || window->OuterRectClipped.Min.y >= window->OuterRectClipped.Max.y) IM_ASSERT((flags & ImGuiWindowFlags_NoTitleBar) != 0);
window->HiddenFramesCanSkipItems = 1; if (!(flags & ImGuiWindowFlags_AlwaysAutoResize) && window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0)
if (window->OuterRectClipped.Min.x >= window->OuterRectClipped.Max.x || window->OuterRectClipped.Min.y >= window->OuterRectClipped.Max.y)
window->HiddenFramesCanSkipItems = 1;
// Hide along with parent or if parent is collapsed // Hide along with parent or if parent is collapsed
if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCanSkipItems > 0)) if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCanSkipItems > 0))
window->HiddenFramesCanSkipItems = 1;
if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCannotSkipItems > 0))
window->HiddenFramesCannotSkipItems = 1;
}
// Don't render if style alpha is 0.0 at the time of Begin(). This is arbitrary and inconsistent but has been there for a long while (may remove at some point)
if (style.Alpha <= 0.0f)
window->HiddenFramesCanSkipItems = 1; window->HiddenFramesCanSkipItems = 1;
if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCannotSkipItems > 0))
window->HiddenFramesCannotSkipItems = 1; // Update the Hidden flag
window->Hidden = (window->HiddenFramesCanSkipItems > 0) || (window->HiddenFramesCannotSkipItems > 0);
// Update the SkipItems flag, used to early out of all items functions (no layout required)
bool skip_items = false;
if (window->Collapsed || !window->Active || window->Hidden)
if (window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0 && window->HiddenFramesCannotSkipItems <= 0)
skip_items = true;
window->SkipItems = skip_items;
} }
// Don't render if style alpha is 0.0 at the time of Begin(). This is arbitrary and inconsistent but has been there for a long while (may remove at some point) return !window->SkipItems;
if (style.Alpha <= 0.0f)
window->HiddenFramesCanSkipItems = 1;
// Update the Hidden flag
window->Hidden = (window->HiddenFramesCanSkipItems > 0) || (window->HiddenFramesCannotSkipItems > 0);
// Update the SkipItems flag, used to early out of all items functions (no layout required)
bool skip_items = false;
if (window->Collapsed || !window->Active || window->Hidden)
if (window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0 && window->HiddenFramesCannotSkipItems <= 0)
skip_items = true;
window->SkipItems = skip_items;
return !skip_items;
} }
void ImGui::End() void ImGui::End()