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remove animation when creating a new window with multi viewport

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Ahmidou Lyazidi 2026-09-17 14:25:33 -07:00
parent 545d1a884a
commit 9d63b956f2
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1 changed files with 23 additions and 1 deletions
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24
backends/imgui_impl_osx.mm
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@ -929,7 +929,7 @@ static void ImGui_ImplOSX_CreateWindow(ImGuiViewport* viewport)
NSWindow* window = [[ImGui_ImplOSX_Window alloc] initWithContentRect:rect
styleMask:styleMask
backing:NSBackingStoreBuffered
defer:YES
defer:NO
screen:screen];
if (viewport->Flags & ImGuiViewportFlags_TopMost)
[window setLevel:NSFloatingWindowLevel];
@ -937,6 +937,16 @@ static void ImGui_ImplOSX_CreateWindow(ImGuiViewport* viewport)
window.title = @"Untitled";
window.opaque = YES;
// macOS plays a fade/zoom "appear" animation on every new NSWindow, which shows up as a pop each
// time a viewport is torn off. Disable it. Removing the animation exposes a one-frame z-order
// "blink" (during the tear-off drag macOS keeps the mouse-down main window frontmost, so this
// borderless window's same-level orderFront loses the race): make it a child of the main window so
// it stays above its parent during the drag; ImGui_ImplOSX_UpdateWindow detaches it once the mouse
// button is released so it becomes a normal, independent window.
[window setAnimationBehavior:NSWindowAnimationBehaviorNone];
if (bd->Window != nil)
[bd->Window addChildWindow:window ordered:NSWindowAbove];
KeyEventResponder* view = [[KeyEventResponder alloc] initWithFrame:rect];
if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_6 && ceil(NSAppKitVersionNumber) < NSAppKitVersionNumber10_15)
{
@ -985,6 +995,17 @@ static void ImGui_ImplOSX_ShowWindow(ImGuiViewport* viewport)
[vd->Window setIsVisible:YES];
}
static void ImGui_ImplOSX_UpdateWindow(ImGuiViewport* viewport)
{
// The window is parented to the main window on creation (see ImGui_ImplOSX_CreateWindow) so it wins
// the z-order race during the tear-off drag. Once that drag ends — detected via the physical mouse
// button, since io.MouseDown is unreliable during the OS-driven window-drag loop — detach it so it
// becomes a normal, independent window (can be sent behind the main window, drops behind other apps).
ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
if (vd != nullptr && vd->Window != nil && vd->Window.parentWindow != nil && ([NSEvent pressedMouseButtons] & 1) == 0)
[vd->Window.parentWindow removeChildWindow:vd->Window];
}
static ImVec2 ImGui_ImplOSX_GetWindowPos(ImGuiViewport* viewport)
{
ImGui_ImplOSX_ViewportData* vd = (ImGui_ImplOSX_ViewportData*)viewport->PlatformUserData;
@ -1121,6 +1142,7 @@ static void ImGui_ImplOSX_InitMultiViewportSupport()
platform_io.Platform_CreateWindow = ImGui_ImplOSX_CreateWindow;
platform_io.Platform_DestroyWindow = ImGui_ImplOSX_DestroyWindow;
platform_io.Platform_ShowWindow = ImGui_ImplOSX_ShowWindow;
platform_io.Platform_UpdateWindow = ImGui_ImplOSX_UpdateWindow;
platform_io.Platform_SetWindowPos = ImGui_ImplOSX_SetWindowPos;
platform_io.Platform_GetWindowPos = ImGui_ImplOSX_GetWindowPos;
platform_io.Platform_SetWindowSize = ImGui_ImplOSX_SetWindowSize;