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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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2
application/uilayer.cpp
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@@ -403,6 +403,8 @@ bool ui_layer::init(GLFWwindow *Window)
{
m_imguiio->ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
m_imguiio->ConfigViewportsNoTaskBarIcon = true;
// only dragging a panel with the cursor past the main window takes it out, not resizing it or placing it at the edge
m_imguiio->ConfigViewportsNoAutoDetach = true;
auto &platformio{ImGui::GetPlatformIO()};
imgui_create_window = platformio.Platform_CreateWindow;
platformio.Platform_CreateWindow = create_viewport_window;