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Backends: Win32 + Viewports: tweak ImGui_ImplWin32_WndProcHandler_PlatformWindow() to be easier to rework in a parallal friendly way. (#8069)

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ocornut 2024-10-28 16:56:34 +01:00
parent 646df39003
commit fedf45c77e
1 changed files with 17 additions and 3 deletions
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20
backends/imgui_impl_win32.cpp
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@ -23,6 +23,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2024-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2024-10-28: [Docking] Rely on property stored inside HWND to retrieve context/viewport, should facilitate attempt to use this for parallel contexts. (#8069)
// 2024-09-16: [Docking] Inputs: fixed an issue where a viewport destroyed while clicking would hog mouse tracking and temporary lead to incorrect update of HoveredWindow. (#7971)
// 2024-07-08: Inputs: Fixed ImGuiMod_Super being mapped to VK_APPS instead of VK_LWIN||VK_RWIN. (#7768)
// 2023-10-05: Inputs: Added support for extra ImGuiKey values: F13 to F24 function keys, app back/forward keys.
@ -187,6 +188,8 @@ static bool ImGui_ImplWin32_InitEx(void* hwnd, bool platform_has_own_dc)
// Our mouse update function expect PlatformHandle to be filled for the main viewport
ImGuiViewport* main_viewport = ImGui::GetMainViewport();
main_viewport->PlatformHandle = main_viewport->PlatformHandleRaw = (void*)bd->hWnd;
::SetPropA(bd->hWnd, "IMGUI_CONTEXT", ImGui::GetCurrentContext());
::SetPropA(bd->hWnd, "IMGUI_VIEWPORT", main_viewport);
ImGui_ImplWin32_InitMultiViewportSupport(platform_has_own_dc);
// Dynamically load XInput library
@ -230,6 +233,8 @@ void ImGui_ImplWin32_Shutdown()
IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?");
ImGuiIO& io = ImGui::GetIO();
::SetPropA(bd->hWnd, "IMGUI_CONTEXT", nullptr);
::SetPropA(bd->hWnd, "IMGUI_VIEWPORT", nullptr);
ImGui_ImplWin32_ShutdownMultiViewportSupport();
// Unload XInput library
@ -314,6 +319,14 @@ static void ImGui_ImplWin32_UpdateKeyModifiers()
io.AddKeyEvent(ImGuiMod_Super, IsVkDown(VK_LWIN) || IsVkDown(VK_RWIN));
}
static ImGuiViewport* ImGui_ImplWin32_FindViewportByPlatformHandle(HWND hwnd)
{
// We could use ImGui::FindViewportByPlatformHandle() but GetPropA() gets us closer to parallel multi-contexts,
// until we can pass an explicit context to FindViewportByPlatformHandle().
//return ImGui::FindViewportByPlatformHandle((void*)hwnd);
return (ImGuiViewport*)::GetPropA(hwnd, "IMGUI_VIEWPORT");
}
// This code supports multi-viewports (multiple OS Windows mapped into different Dear ImGui viewports)
// Because of that, it is a little more complicated than your typical single-viewport binding code!
static void ImGui_ImplWin32_UpdateMouseData()
@ -326,7 +339,7 @@ static void ImGui_ImplWin32_UpdateMouseData()
bool has_mouse_screen_pos = ::GetCursorPos(&mouse_screen_pos) != 0;
HWND focused_window = ::GetForegroundWindow();
const bool is_app_focused = (focused_window && (focused_window == bd->hWnd || ::IsChild(focused_window, bd->hWnd) || ImGui::FindViewportByPlatformHandle((void*)focused_window)));
const bool is_app_focused = (focused_window && (focused_window == bd->hWnd || ::IsChild(focused_window, bd->hWnd) || ImGui_ImplWin32_FindViewportByPlatformHandle(focused_window)));
if (is_app_focused)
{
// (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when io.ConfigNavMoveSetMousePos is enabled by user)
@ -364,7 +377,7 @@ static void ImGui_ImplWin32_UpdateMouseData()
ImGuiID mouse_viewport_id = 0;
if (has_mouse_screen_pos)
if (HWND hovered_hwnd = ::WindowFromPoint(mouse_screen_pos))
if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hovered_hwnd))
if (ImGuiViewport* viewport = ImGui_ImplWin32_FindViewportByPlatformHandle(hovered_hwnd))
mouse_viewport_id = viewport->ID;
io.AddMouseViewportEvent(mouse_viewport_id);
}
@ -1072,6 +1085,7 @@ static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
// Secondary viewports store their imgui context
::SetPropA(vd->Hwnd, "IMGUI_CONTEXT", ImGui::GetCurrentContext());
::SetPropA(vd->Hwnd, "IMGUI_VIEWPORT", viewport);
}
static void ImGui_ImplWin32_DestroyWindow(ImGuiViewport* viewport)
@ -1294,7 +1308,7 @@ static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd,
LRESULT result = 0;
if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
result = true;
else if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hWnd))
else if (ImGuiViewport* viewport = ImGui_ImplWin32_FindViewportByPlatformHandle(hWnd))
{
switch (msg)
{