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Docking: Flicker fix when clicking on a Tab leading of a new window, in particular would be noticeable when using nested tab bars.

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This commit is contained in:
omar 2018-09-13 11:46:59 +02:00
parent 1cefc48f13
commit c355ed1267
1 changed files with 14 additions and 5 deletions
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19
imgui.cpp
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@ -11419,9 +11419,16 @@ void ImGui::BeginDocked(ImGuiWindow* window, bool* p_open)
window->DockTabIsVisible = false;
return;
}
window->DockTabIsVisible = (dock_node->TabBar && dock_node->TabBar->VisibleTabId == window->ID);
// When we are about to select this tab (which will only be visible on the _next frame_), flag it with a non-zero HiddenFramesForResize.
// This will have the important effect of actually returning true in Begin() and not setting SkipItems, allowing an earlier submission of the window contents.
// This is analogous to regular windows being hidden from one frame. It is especially important as nested TabBars would otherwise generate flicker in the form
// of one empty frame.
// Note that we set HiddenFramesForResize=2 because BeginDocked() is called just before Begin() has a chance to decrement the value. Effectively it'll be a 1 frame thing.
if (!window->DockTabIsVisible && dock_node->TabBar && dock_node->TabBar->NextSelectedTabId == window->ID)
window->HiddenFramesForResize = 2;
// Update window flag
IM_ASSERT((window->Flags & ImGuiWindowFlags_ChildWindow) == 0);
window->Flags |= ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_AlwaysUseWindowPadding | ImGuiWindowFlags_NoResize;
@ -12482,10 +12489,12 @@ void ImGui::ShowDockingDebug()
{
IM_ASSERT(node->ChildNodes[0] == NULL || node->ChildNodes[0]->ParentNode == node);
IM_ASSERT(node->ChildNodes[1] == NULL || node->ChildNodes[1]->ParentNode == node);
ImGui::BulletText("Pos (%.0f,%.0f), Size (%.0f, %.0f), LastExplicit (%.0f, %.0f)%s%s",
node->Pos.x, node->Pos.y, node->Size.x, node->Size.y,
node->LastExplicitSize.x, node->LastExplicitSize.y,
node->IsExplicitRoot ? ", IsExplicitRoot " : "", node->IsDocumentRoot ? ", IsDocumentRoot " : "");
ImGui::BulletText("Pos (%.0f,%.0f), Size (%.0f, %.0f), LastExplicit (%.0f, %.0f)",
node->Pos.x, node->Pos.y, node->Size.x, node->Size.y,
node->LastExplicitSize.x, node->LastExplicitSize.y);
ImGui::BulletText("Flags %02X%s%s%s%s",
node->Flags, node->IsExplicitRoot ? ", IsExplicitRoot" : "", node->IsDocumentRoot ? ", IsDocumentRoot" : "",
(GImGui->FrameCount - node->LastFrameAlive < 2) ? ", IsAlive" : "", (GImGui->FrameCount - node->LastFrameActive < 2) ? ", IsActive" : "");
if (node->ChildNodes[0])
NodeDockNode(node->ChildNodes[0], "Child[0]");
if (node->ChildNodes[1])