I'm writing an app using PyQt4 4.11.4 (Qt 4.8.7) and Python 2.7.12. When running it using RemoteApp (built-in Windows Remote Desktop service) I couldn't get windows to open in maximized state: it appears maximized for a few (single?) frames, and jumps to restored state immediately. Code to reproduce bug:
from PyQt4.QtGui import QApplication, QDialog
from PyQt4.QtCore import Qt
import sys
app = QApplication(sys.argv)
w = QDialog()
w.setWindowFlags(Qt.Window)
w.showMaximized()
w.show()
sys.exit(app.exec_())
Bug couldn't be reproduced with Python 2.6.4 and Qt 4.5.3 (app is built with PyInstaller and I can't find a way to get PyQt version).
The only mention of similiar bug (not sure if same) I found is here.
Is there any fix for this bug? I don't consider using older Qt version as solution.
UP1: The snippet above rewritten in C++ produces the same behavior, so it's a Qt bug.
UP2:
Windows in Qt 4.8 have WS_POPUP and WS_combine_POPUPWINDOW styles, while in Qt 4.5 they don't. Bug possibly introduced while fixing this one.
UP3:
Yes, the problem is in WS_POPUP style. After manually removing it window stays maximized:
...
HWND hWnd = w.winId();
long style = GetWindowLong(hWnd, GWL_STYLE);
SetWindowLong(hWnd, GWL_STYLE, style & ~WS_POPUP);
...
Searching different way to remove it...
Problem solved by reverting this patch and rebuilding Qt:
diff --git a/src/gui/kernel/qwidget_win.cpp b/src/gui/kernel/qwidget_win.cpp
index 39ed750..c358b9b 100644
--- a/src/gui/kernel/qwidget_win.cpp
+++ b/src/gui/kernel/qwidget_win.cpp
@@ -329,18 +329,11 @@ void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool destroyO
if (topLevel) {
if ((type == Qt::Window || dialog || tool)) {
if (!(flags & Qt::FramelessWindowHint)) {
- if (!(flags & Qt::MSWindowsFixedSizeDialogHint)) {
+ style |= WS_POPUP;
+ if (!(flags & Qt::MSWindowsFixedSizeDialogHint))
style |= WS_THICKFRAME;
- if(!(flags &
- ( Qt::WindowSystemMenuHint
- | Qt::WindowTitleHint
- | Qt::WindowMinMaxButtonsHint
- | Qt::WindowCloseButtonHint
- | Qt::WindowContextHelpButtonHint)))
- style |= WS_POPUP;
- } else {
- style |= WS_POPUP | WS_DLGFRAME;
- }
+ else
+ style |= WS_DLGFRAME;
}
if (flags & Qt::WindowTitleHint)
style |= WS_CAPTION;
@@ -424,6 +417,14 @@ void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool destroyO
if (!q->testAttribute(Qt::WA_Resized)) {
w = sw/2;
h = 4*sh/10;
+ if (extra) {
+ int dx = rect.right - rect.left;
+ int dy = rect.bottom - rect.top;
+ w = qMin(w, extra->maxw + dx);
+ h = qMin(h, extra->maxh + dy);
+ w = qMax(w, extra->minw + dx);
+ h = qMax(h, extra->minh + dy);
+ }
}
if (!wasMoved) {
x = sw/2 - w/2;
found here