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8249592: Robot.mouseMove moves cursor to incorrect location when display scale varies and Java runs in DPI Unaware mode

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Reviewed-by: serb, aivanov
This commit is contained in:
Rajat Mahajan 2022-03-10 05:09:29 +00:00 committed by Sergey Bylokhov
parent ff76620487
commit 8aba4de984
1 changed files with 21 additions and 8 deletions
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29
src/java.desktop/windows/native/libawt/windows/awt_Robot.cpp
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@ -28,20 +28,33 @@
#include "awt_Component.h"
#include <winuser.h>
static int signum(int i) {
// special version of signum which returns 1 when value is 0
return i >= 0 ? 1 : -1;
}
static void MouseMove(jint x, jint y)
{
INPUT mouseInput = {0};
mouseInput.type = INPUT_MOUSE;
mouseInput.mi.time = 0;
mouseInput.mi.dwFlags = MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE;
mouseInput.mi.dx = (x * 65536 /::GetSystemMetrics(SM_CXSCREEN)) + signum(x);
mouseInput.mi.dy = (y * 65536 /::GetSystemMetrics(SM_CYSCREEN)) + signum(y);
// The following calculations take into account a multi-monitor setup using
// a virtual screen for all monitors combined.
// More details from Microsoft are here --
// https://docs.microsoft.com/en-us/windows/win32/gdi/the-virtual-screen
x -= ::GetSystemMetrics(SM_XVIRTUALSCREEN);
y -= ::GetSystemMetrics(SM_YVIRTUALSCREEN);
mouseInput.mi.dwFlags = MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE |
MOUSEEVENTF_VIRTUALDESK;
int scW = ::GetSystemMetrics(SM_CXVIRTUALSCREEN);
int scH = ::GetSystemMetrics(SM_CYVIRTUALSCREEN);
// The following calculation to deduce mouse coordinates is based on
// empirical data
mouseInput.mi.dx = (x * 65536 + scW - 1) / scW;
mouseInput.mi.dy = (y * 65536 + scH - 1) / scH;
::SendInput(1, &mouseInput, sizeof(mouseInput));
}
static void MousePress(jint buttonMask)