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Viewports: Fixed a crash while a window owning its viewport disappear while being dragged.

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t would manifest when e.g. reconfiguring dock nodes while dragging.
This commit is contained in:
ocornut 2021-09-09 21:05:40 +02:00
parent 9a49c1ddbd
commit 6b77668171
2 changed files with 21 additions and 12 deletions
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4
docs/CHANGELOG.txt
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@ -148,7 +148,9 @@ Docking+Viewports Branch:
- Docking: fixed settings load issue when mouse wheeling. (#4310)
- Docking + Drag and Drop: Fixed using BeginDragDropSource() or BeginDragDropTarget() inside a Begin()
that returned false because the window is docked. (#4515)
- Viewports: Viewports: fixed unnecessary creation of temporary viewports when multiple docked windows
- Viewports: Fixed a crash while a window owning its viewport disappear while being dragged.
It would manifest when e.g. reconfiguring dock nodes while dragging.
- Viewports: Fixed unnecessary creation of temporary viewports when multiple docked windows
got reassigned to a new node (created mid-frame) which already has a HostWindow.

11
imgui.cpp
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@ -3690,7 +3690,10 @@ void ImGui::UpdateMouseMovingWindowNewFrame()
KeepAliveID(g.ActiveId);
IM_ASSERT(g.MovingWindow && g.MovingWindow->RootWindowDockTree);
ImGuiWindow* moving_window = g.MovingWindow->RootWindowDockTree;
if (g.IO.MouseDown[0] && IsMousePosValid(&g.IO.MousePos))
// When a window stop being submitted while being dragged, it may will its viewport until next Begin()
const bool window_disappared = (!moving_window->WasActive || moving_window->Viewport == NULL);
if (g.IO.MouseDown[0] && IsMousePosValid(&g.IO.MousePos) && !window_disappared)
{
ImVec2 pos = g.IO.MousePos - g.ActiveIdClickOffset;
if (moving_window->Pos.x != pos.x || moving_window->Pos.y != pos.y)
@ -3706,6 +3709,8 @@ void ImGui::UpdateMouseMovingWindowNewFrame()
FocusWindow(g.MovingWindow);
}
else
{
if (!window_disappared)
{
// Try to merge the window back into the main viewport.
// This works because MouseViewport should be != MovingWindow->Viewport on release (as per code in UpdateViewports)
@ -3718,6 +3723,7 @@ void ImGui::UpdateMouseMovingWindowNewFrame()
// Clear the NoInput window flag set by the Viewport system
moving_window->Viewport->Flags &= ~ImGuiViewportFlags_NoInputs; // FIXME-VIEWPORT: Test engine managed to crash here because Viewport was NULL.
}
g.MovingWindow = NULL;
ClearActiveID();
@ -11855,7 +11861,8 @@ static void ImGui::UpdateViewportsNewFrame()
// Update mouse reference viewport
// (when moving a window we aim at its viewport, but this will be overwritten below if we go in drag and drop mode)
if (g.MovingWindow)
// (MovingViewport->Viewport will be NULL in the rare situation where the window disappared while moving, set UpdateMouseMovingWindowNewFrame() for details)
if (g.MovingWindow && g.MovingWindow->Viewport)
g.MouseViewport = g.MovingWindow->Viewport;
else
g.MouseViewport = g.MouseLastHoveredViewport;