From cd2b5f1ada07fc7a5ec31e3b48a7fdf76bf62020 Mon Sep 17 00:00:00 2001 From: Olivier Goffart Date: Mon, 13 Feb 2017 08:48:25 +0100 Subject: Resize the window when the screen's dpi changes That's what the MSDN documentation say one should do in the handler for WM_DPICHANGED [ChangeLog][QtGui][Windows] Windows are now automatically resized when they are moved on a screen to adapt to the new pixel ratio. Task-number: QTBUG-55510 Task-number: QTBUG-48242 Change-Id: I7688f12165f76585d75686e2e94b0fc562627be2 Reviewed-by: Friedemann Kleint --- src/plugins/platforms/windows/qtwindowsglobal.h | 7 +++++++ src/plugins/platforms/windows/qwindowscontext.cpp | 9 +++++++++ src/plugins/platforms/windows/qwindowswindow.cpp | 8 ++++++-- src/plugins/platforms/windows/qwindowswindow.h | 3 ++- 4 files changed, 24 insertions(+), 3 deletions(-) diff --git a/src/plugins/platforms/windows/qtwindowsglobal.h b/src/plugins/platforms/windows/qtwindowsglobal.h index 27632de688..a5c05bf1a3 100644 --- a/src/plugins/platforms/windows/qtwindowsglobal.h +++ b/src/plugins/platforms/windows/qtwindowsglobal.h @@ -56,6 +56,10 @@ # define WM_GESTURE 0x0119 #endif +#ifndef WM_DPICHANGED +# define WM_DPICHANGED 0x02E0 +#endif + QT_BEGIN_NAMESPACE namespace QtWindows @@ -96,6 +100,7 @@ enum WindowsEventType // Simplify event types FocusInEvent = WindowEventFlag + 17, FocusOutEvent = WindowEventFlag + 18, WhatsThisEvent = WindowEventFlag + 19, + DpiChangedEvent = WindowEventFlag + 21, MouseEvent = MouseEventFlag + 1, MouseWheelEvent = MouseEventFlag + 2, CursorEvent = MouseEventFlag + 3, @@ -266,6 +271,8 @@ inline QtWindows::WindowsEventType windowsEventType(UINT message, WPARAM wParamI #endif case WM_GESTURE: return QtWindows::GestureEvent; + case WM_DPICHANGED: + return QtWindows::DpiChangedEvent; default: break; } diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp index fefc848d01..5745fc6d19 100644 --- a/src/plugins/platforms/windows/qwindowscontext.cpp +++ b/src/plugins/platforms/windows/qwindowscontext.cpp @@ -1088,6 +1088,15 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message, return true; #endif } break; + case QtWindows::DpiChangedEvent: { + platformWindow->setFlag(QWindowsWindow::WithinDpiChanged); + const RECT *prcNewWindow = reinterpret_cast(lParam); + SetWindowPos(hwnd, NULL, prcNewWindow->left, prcNewWindow->top, + prcNewWindow->right - prcNewWindow->left, + prcNewWindow->bottom - prcNewWindow->top, SWP_NOZORDER | SWP_NOACTIVATE); + platformWindow->clearFlag(QWindowsWindow::WithinDpiChanged); + return true; + } #if !defined(QT_NO_SESSIONMANAGER) case QtWindows::QueryEndSessionApplicationEvent: { QWindowsSessionManager *sessionManager = platformSessionManager(); diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp index 42eb6d4ca7..40229d00af 100644 --- a/src/plugins/platforms/windows/qwindowswindow.cpp +++ b/src/plugins/platforms/windows/qwindowswindow.cpp @@ -2114,8 +2114,12 @@ void QWindowsWindow::setFrameStrutEventsEnabled(bool enabled) void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const { - const QWindowsGeometryHint hint(window(), m_data.customMargins); - hint.applyToMinMaxInfo(m_data.hwnd, mmi); + // We don't apply the min/max size hint as we change the dpi, because we did not adjust the + // QScreen of the window yet so we don't have the min/max with the right ratio + if (!testFlag(QWindowsWindow::WithinDpiChanged)) { + const QWindowsGeometryHint hint(window(), m_data.customMargins); + hint.applyToMinMaxInfo(m_data.hwnd, mmi); + } if ((testFlag(WithinMaximize) || (window()->windowState() == Qt::WindowMinimized)) && (m_data.flags & Qt::FramelessWindowHint)) { diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h index 8179280bb3..10cfc18dff 100644 --- a/src/plugins/platforms/windows/qwindowswindow.h +++ b/src/plugins/platforms/windows/qwindowswindow.h @@ -205,7 +205,8 @@ public: MaximizeToFullScreen = 0x80000, InputMethodDisabled = 0x100000, Compositing = 0x200000, - HasBorderInFullScreen = 0x400000 + HasBorderInFullScreen = 0x400000, + WithinDpiChanged = 0x800000, }; QWindowsWindow(QWindow *window, const QWindowsWindowData &data); -- cgit v1.2.3