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Backends: SDL3: use SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED (SDL 3.4.0+) when available to avoid refreshing monitor work area every frame on Windows. (#8415)

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ocornut
2026-03-25 17:25:32 +01:00
parent e05bd9deb9
commit 8d8892ce0e
2 changed files with 8 additions and 1 deletions
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7
backends/imgui_impl_sdl3.cpp
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@@ -24,6 +24,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2026-03-25: [Docking] Use SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED (SDL 3.4.0+) when available to avoid refreshing monitor work area every frame on Windows. (#8415)
// 2026-03-09: [Docking] Fixed an issue dated 2025/04/09 (1.92 WIP) where a refactor+merge caused ImGuiBackendFlags_HasMouseHoveredViewport to never be set, causing foreign windows to be ignored when deciding of hovered viewport. (#9284)
// 2026-02-13: Inputs: systems other than X11 are back to starting mouse capture on mouse down (reverts 2025-02-26 change). Only X11 requires waiting for a drag by default (not ideal, but a better default for X11 users). Added ImGui_ImplSDL3_SetMouseCaptureMode() for X11 debugger users. (#3650, #6410, #9235)
// 2026-01-15: Changed GetClipboardText() handler to return nullptr on error aka clipboard contents is not text. Consistent with other backends. (#9168)
@@ -105,6 +106,7 @@
#else
#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE 0
#endif
#define SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED SDL_VERSION_ATLEAST(3,4,0)
// FIXME-LEGACY: remove when SDL 3.1.3 preview is released.
#ifndef SDLK_APOSTROPHE
@@ -475,6 +477,9 @@ bool ImGui_ImplSDL3_ProcessEvent(const SDL_Event* event)
case SDL_EVENT_DISPLAY_REMOVED:
case SDL_EVENT_DISPLAY_MOVED:
case SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED:
#if SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED
case SDL_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED:
#endif
{
bd->WantUpdateMonitors = true;
return true;
@@ -997,7 +1002,7 @@ void ImGui_ImplSDL3_NewFrame()
ImGui_ImplSDL3_GetWindowSizeAndFramebufferScale(bd->Window, &io.DisplaySize, &io.DisplayFramebufferScale);
// Update monitors
#ifdef WIN32
#if defined(WIN32) && !SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED
bd->WantUpdateMonitors = true; // Keep polling under Windows to handle changes of work area when resizing task-bar (#8415)
#endif
if (bd->WantUpdateMonitors)

2
docs/CHANGELOG.txt
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@@ -170,6 +170,8 @@ Docking+Viewports Branch:
- Backends: SDL2, SDL3: fixed an issue dated 2025/04/09 (1.92 WIP) where a refactor
and a merge caused ImGuiBackendFlags_HasMouseHoveredViewport to never be set, causing
foreign windows to be ignored when deciding of hovered viewport. (#9284) [@ravencgg]
- Backends: SDL3: use SDL_HAS_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED (SDL 3.4.0+) when
available to avoid refreshing monitor work area every frame on Windows. (#8415)
-----------------------------------------------------------------------