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Code Issues 156 Wiki Activity

fix(ui): keep panels in the main window when resizing them at the screen edge

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Pulling a panel's grip into the corner of the screen pushed it a couple of
pixels past the main window, and ImGui gave it an OS window of its own. Now
a panel only comes out when dragged with the cursor outside the main window.

A panel that stays in the main window needs its grips in reach, so a resize
stops at the edge, and a panel left past the edge or too big for the window
is moved back and shrunk to fit.

This is a new io.ConfigViewportsNoAutoDetach option in our copy of ImGui, so
it has to be carried over when ImGui gets updated. ImGui itself has no option
for this, as of 1.93.1.
This commit is contained in:
maj00r
2026-10-31 00:45:46 +01:00
parent 66a940d4f5
commit 5fa03304ef
3 changed files with 59 additions and 2 deletions
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imgui/imgui.h
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@@ -2360,6 +2360,7 @@ struct ImGuiIO
bool ConfigViewportsNoTaskBarIcon; // = false // Disable default OS task bar icon flag for secondary viewports. When a viewport doesn't want a task bar icon, ImGuiViewportFlags_NoTaskBarIcon will be set on it.
bool ConfigViewportsNoDecoration; // = true // Disable default OS window decoration flag for secondary viewports. When a viewport doesn't want window decorations, ImGuiViewportFlags_NoDecoration will be set on it. Enabling decoration can create subsequent issues at OS levels (e.g. minimum window size).
bool ConfigViewportsNoDefaultParent; // = false // Disable default OS parenting to main viewport for secondary viewports. By default, viewports are marked with ParentViewportId = <main_viewport>, expecting the platform backend to setup a parent/child relationship between the OS windows (some backend may ignore this). Set to true if you want the default to be 0, then all viewports will be top-level OS windows.
bool ConfigViewportsNoAutoDetach; // = false // MaSzyna addition: a floating window stays inside its host viewport: a resize stops at its edge, and a window left past it, or too big for it, is moved and shrunk to fit. It gets a viewport of its own only when dragged with the mouse cursor past the host viewport. Popups and tooltips are not affected.
// Miscellaneous options
// (you can visualize and interact with all options in 'Demo->Configuration')