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Backends: Win32: Secondary viewports WndProc handler retrieve/set imgui context from the HWND.

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Allowing WndProc dispatch to work in multi-context setups.
This commit is contained in:
ocornut 2024-06-20 17:44:19 -07:00
parent 3acb869a95
commit 416cfdb99d
2 changed files with 21 additions and 7 deletions
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26
backends/imgui_impl_win32.cpp
View File

@ -1054,6 +1054,9 @@ static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
vd->HwndOwned = true;
viewport->PlatformRequestResize = false;
viewport->PlatformHandle = viewport->PlatformHandleRaw = vd->Hwnd;
// Secondary viewports store their imgui context
::SetPropA(vd->Hwnd, "IMGUI_CONTEXT", ImGui::GetCurrentContext());
}
static void ImGui_ImplWin32_DestroyWindow(ImGuiViewport* viewport)
@ -1256,10 +1259,16 @@ static void ImGui_ImplWin32_OnChangedViewport(ImGuiViewport* viewport)
static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
return true;
// Allow secondary viewport WndProc to be called regardless of current context
ImGuiContext* hwnd_ctx = (ImGuiContext*)::GetPropA(hWnd, "IMGUI_CONTEXT");
ImGuiContext* prev_ctx = ImGui::GetCurrentContext();
if (hwnd_ctx != prev_ctx && hwnd_ctx != NULL)
ImGui::SetCurrentContext(hwnd_ctx);
if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hWnd))
LRESULT result = 0;
if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
result = true;
else if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hWnd))
{
switch (msg)
{
@ -1274,7 +1283,7 @@ static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd,
break;
case WM_MOUSEACTIVATE:
if (viewport->Flags & ImGuiViewportFlags_NoFocusOnClick)
return MA_NOACTIVATE;
result = MA_NOACTIVATE;
break;
case WM_NCHITTEST:
// Let mouse pass-through the window. This will allow the backend to call io.AddMouseViewportEvent() correctly. (which is optional).
@ -1282,12 +1291,15 @@ static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd,
// If you cannot easily access those viewport flags from your windowing/event code: you may manually synchronize its state e.g. in
// your main loop after calling UpdatePlatformWindows(). Iterate all viewports/platform windows and pass the flag to your windowing system.
if (viewport->Flags & ImGuiViewportFlags_NoInputs)
return HTTRANSPARENT;
result = HTTRANSPARENT;
break;
}
}
return DefWindowProc(hWnd, msg, wParam, lParam);
if (result == 0)
result = DefWindowProc(hWnd, msg, wParam, lParam);
if (hwnd_ctx != prev_ctx && hwnd_ctx != NULL)
ImGui::SetCurrentContext(prev_ctx);
return result;
}
static void ImGui_ImplWin32_InitPlatformInterface(bool platform_has_own_dc)

2
docs/CHANGELOG.txt
View File

@ -68,6 +68,8 @@ Docking+Viewports Branch:
- Backends: SDL3: Update for introduction of SDL_GLContext from void*. (#7701, #7702)
[@bcsanches]
- Backends: Win32: Secondary viewports WndProc handler retrieve/set imgui context from
the HWND, allowing WndProc dispatch to work in multi-context setups.
-----------------------------------------------------------------------