github_mirror
/
framelesshelper
mirror of https://github.com/wangwenx190/framelesshelper.git
1
0
Fork 1
Code Issues Packages Projects Releases Wiki Activity

Improve multi-monitor experience. 

When monitors have different resolution and DPI.

Signed-off-by: Yuhang Zhao <2546789017@qq.com>
This commit is contained in:
Yuhang Zhao 2020-04-06 14:09:25 +08:00
parent c1fddf0028
commit 7ed4e4f7ca
1 changed files with 35 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
winnativeeventfilter.cpp
View File

@ -28,6 +28,7 @@
#include <QGuiApplication>
#include <QLibrary>
#include <QOperatingSystemVersion>
#include <QTimer>
#include <QWindow>
#include <QtMath>
#include <d2d1.h>
@ -560,16 +561,17 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
break;
}
case WM_WINDOWPOSCHANGED: {
// Repaint the non-client area immediately.
// The client area of our window equals to it's non-client area now (we
// achieve this in WM_NCCALCSIZE), so the following line will repaint
// the whole window.
InvalidateRect(msg->hwnd, nullptr, TRUE);
// Don't return true here because it will block Qt's paint events
// and the window will never be updated in time.
// and it'll result in a never updated window.
break;
}
case WM_DPICHANGED: {
// Qt will do the scaling internally and automatically.
// See: qt/qtbase/src/plugins/platforms/windows/qwindowscontext.cpp
// We just use this message for debuging purposes.
const auto dpiX = LOWORD(msg->wParam);
const auto dpiY = HIWORD(msg->wParam);
// dpiX and dpiY are identical. Just to silence a compiler warning.
@ -578,7 +580,30 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
<< ", new DPR -->"
<< getPreferedNumber(qreal(dpi) /
qreal(m_defaultDotsPerInch));
refreshWindow(msg->hwnd);
// Record the window handle now, don't use msg->hwnd directly because
// when we finally execute the function, it has changed.
const HWND _hWnd = msg->hwnd;
// Wait some time for Qt to adjust the window size, but don't wait too
// long, we want to refresh the window as soon as possible.
// We can intercept Qt's handling of this message and resize the window
// ourself, but after reading Qt's source code, I found that Qt does
// more than resizing, so it's safer to let Qt do the scaling.
QTimer::singleShot(50, [_hWnd]() {
RECT rect = {0, 0, 0, 0};
GetWindowRect(_hWnd, &rect);
const int x = rect.left;
const int y = rect.top;
const int width = qAbs(rect.right - rect.left);
const int height = qAbs(rect.bottom - rect.top);
// Don't increase the window size too much, otherwise it would be
// too obvious for the user and the experience is not good.
MoveWindow(_hWnd, x, y, width + 1, height + 1, TRUE);
// Re-paint the window after resizing.
refreshWindow(_hWnd);
// Restore and repaint.
MoveWindow(_hWnd, x, y, width, height, TRUE);
refreshWindow(_hWnd);
});
break;
}
default: {
@ -836,8 +861,13 @@ void WinNativeEventFilter::refreshWindow(HWND handle) {
SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOSIZE |
SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER);
// Inform the window to adjust it's size to let it's contents fit the
// window.
// adjusted window.
SendMessageW(handle, WM_SIZE, 0, 0);
// The InvalidateRect function adds a rectangle to the specified
// window's update region. The update region represents the portion of
// the window's client area that must be redrawn. If lpRect is NULL, the
// entire client area is added to the update region.
InvalidateRect(handle, nullptr, TRUE);
// The UpdateWindow function updates the client area of the specified
// window by sending a WM_PAINT message to the window if the window's
// update region is not empty. The function sends a WM_PAINT message