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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/win/event_creation_utils.h"
#include <windows.h>
#include <winuser.h>
#include <algorithm>
#include "ui/gfx/geometry/point.h"
namespace ui {
bool SendMouseEvent(const gfx::Point& point, int flags) {
INPUT input = {INPUT_MOUSE};
// Get the max screen coordinate for use in computing the normalized absolute
// coordinates required by SendInput.
const int screen_width = ::GetSystemMetrics(SM_CXSCREEN);
const int screen_height = ::GetSystemMetrics(SM_CYSCREEN);
int screen_x = std::clamp(point.x(), 0, screen_width - 1);
int screen_y = std::clamp(point.y(), 0, screen_height - 1);
// In normalized absolute coordinates, (0, 0) maps onto the upper-left corner
// of the display surface, while (65535, 65535) maps onto the lower-right
// corner.
// https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-mouse_event#remarks
static constexpr double kNormalizedScreenSize = 65536.0;
// Form the input data containing the normalized absolute coordinates. As of
// Windows 10 Fall Creators Update, moving to an absolute position of zero
// does not work. It seems that moving to 1,1 does, though.
input.mi.dx = static_cast<LONG>(std::max(
1.0, std::ceil(screen_x * (kNormalizedScreenSize / screen_width))));
input.mi.dy = static_cast<LONG>(std::max(
1.0, std::ceil(screen_y * (kNormalizedScreenSize / screen_height))));
input.mi.dwFlags = static_cast<DWORD>(flags);
return ::SendInput(1, &input, sizeof(input)) == 1;
}
} // namespace ui
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