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Backends: SDL: Fix multi-viewport dragging issue with SDL on some systems. (#5012)

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Rokas Kupstys 2022-02-25 17:18:40 +01:00 committed by ocornut
parent 8639a2f9f8
commit f337378066
2 changed files with 17 additions and 6 deletions
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22
backends/imgui_impl_sdl.cpp
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@ -96,6 +96,7 @@ struct ImGui_ImplSDL2_Data
Uint32 MouseWindowID;
int MouseButtonsDown;
SDL_Cursor* MouseCursors[ImGuiMouseCursor_COUNT];
int PendingMouseLeaveFrame;
char* ClipboardTextData;
bool MouseCanUseGlobalState;
bool UseVulkan;
@ -315,16 +316,19 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
}
case SDL_WINDOWEVENT:
{
// When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right.
// However we won't get a correct LEAVE event for a captured window.
// - When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right.
// - However we won't get a correct LEAVE event for a captured window.
// - In some cases, when detaching a window from main viewport SDL may send SDL_WINDOWEVENT_ENTER one frame too late,
// causing SDL_WINDOWEVENT_LEAVE on previous frame to interrupt drag operation by clear mouse position. This is why
// we delay process the SDL_WINDOWEVENT_LEAVE events by one frame. See issue #5012 for details.
Uint8 window_event = event->window.event;
if (window_event == SDL_WINDOWEVENT_ENTER)
bd->MouseWindowID = event->window.windowID;
if (window_event == SDL_WINDOWEVENT_LEAVE)
{
bd->MouseWindowID = 0;
io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
bd->MouseWindowID = event->window.windowID;
bd->PendingMouseLeaveFrame = 0;
}
if (window_event == SDL_WINDOWEVENT_LEAVE)
bd->PendingMouseLeaveFrame = ImGui::GetFrameCount() + 1;
if (window_event == SDL_WINDOWEVENT_FOCUS_GAINED)
io.AddFocusEvent(true);
else if (window_event == SDL_WINDOWEVENT_FOCUS_LOST)
@ -665,6 +669,12 @@ void ImGui_ImplSDL2_NewFrame()
io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
bd->Time = current_time;
if (bd->PendingMouseLeaveFrame && bd->PendingMouseLeaveFrame == ImGui::GetFrameCount())
{
bd->MouseWindowID = 0;
io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
}
ImGui_ImplSDL2_UpdateMouseData();
ImGui_ImplSDL2_UpdateMouseCursor();

1
docs/CHANGELOG.txt
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@ -134,6 +134,7 @@ Docking+Viewports Branch:
- Docking: Fixed floating docked nodes not being clamped into viewport workrect to stay reachable
when g.ConfigWindowsMoveFromTitleBarOnly is set and multi-viewports are disabled. (#5044)
- Backends: SDL: Fixed dragging out main viewport broken on some SDL setups. (#5012) [@rokups]
- Viewports: Fixed translating a host viewport from briefly altering the size of AlwaysAutoResize windows. (#5057)
- Viewports: Fixed main viewport size not matching ImDrawData::DisplaySize for one frame during resize
when multi-viewports are disabled. (#4900)