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IO: added AddMouseViewportEvent() + used in backends.

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ocornut
2022-01-18 17:24:59 +01:00
parent 1338eb31f7
commit e278277d53
8 changed files with 48 additions and 22 deletions
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11
backends/imgui_impl_win32.cpp
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@@ -131,7 +131,7 @@ bool ImGui_ImplWin32_Init(void* hwnd)
io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports; // We can create multi-viewports on the Platform side (optional)
io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can set io.MouseHoveredViewport correctly (optional)
io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can call io.AddMouseViewportEvent() with correct data (optional)
bd->hWnd = (HWND)hwnd;
bd->WantUpdateHasGamepad = true;
@@ -299,18 +299,19 @@ static void ImGui_ImplWin32_UpdateMouseData()
}
}
// (Optional) When using multiple viewports: set io.MouseHoveredViewport to the viewport the OS mouse cursor is hovering.
// (Optional) When using multiple viewports: call io.AddMouseViewportEvent() with the viewport the OS mouse cursor is hovering.
// If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, Dear imGui will ignore this field and infer the information using its flawed heuristic.
// - [X] Win32 backend correctly ignore viewports with the _NoInputs flag (here using ::WindowFromPoint with WM_NCHITTEST + HTTRANSPARENT in WndProc does that)
// Some backend are not able to handle that correctly. If a backend report an hovered viewport that has the _NoInputs flag (e.g. when dragging a window
// for docking, the viewport has the _NoInputs flag in order to allow us to find the viewport under), then Dear ImGui is forced to ignore the value reported
// by the backend, and use its flawed heuristic to guess the viewport behind.
// - [X] Win32 backend correctly reports this regardless of another viewport behind focused and dragged from (we need this to find a useful drag and drop target).
io.MouseHoveredViewport = 0;
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))
io.MouseHoveredViewport = viewport->ID;
mouse_viewport_id = viewport->ID;
io.AddMouseViewportEvent(mouse_viewport_id);
}
// Gamepad navigation mapping
@@ -1077,7 +1078,7 @@ static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd,
return MA_NOACTIVATE;
break;
case WM_NCHITTEST:
// Let mouse pass-through the window. This will allow the backend to set io.MouseHoveredViewport properly (which is OPTIONAL).
// Let mouse pass-through the window. This will allow the backend to call io.AddMouseViewportEvent() correctly. (which is optional).
// The ImGuiViewportFlags_NoInputs flag is set while dragging a viewport, as want to detect the window behind the one we are dragging.
// 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.