printing: Make sure window modality works with native print dialogs

Make the native QPrintDialogs and QPageSetupDialogs participate in the
Qt modality system. Even though we are overriding QDialog::setVisible()
and exec() to show the native dialgos, we want to still call into
QDialog::setVisible() so that modality state and events are properly
handled. We do this by setting the WA_DontShowOnScreen attribute on
QPrintDialog and QPageSetupDialog, and call QDialog::setVisible() at the
appropriate places.

Change-Id: I7d800790c40ba1f467c3315e29abb79a7fa0eb34
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/printsupport/dialogs/qpagesetupdialog_mac.mm

@@ -155,11 +155,15 @@ void QPageSetupDialogPrivate::closeCocoaPageLayout()
 
 QPageSetupDialog::QPageSetupDialog(QPrinter *printer, QWidget *parent)
     : QAbstractPageSetupDialog(*(new QPageSetupDialogPrivate), printer, parent)
-{ }
+{
+    setAttribute(Qt::WA_DontShowOnScreen);
+}
 
 QPageSetupDialog::QPageSetupDialog(QWidget *parent)
     : QAbstractPageSetupDialog(*(new QPageSetupDialogPrivate), 0, parent)
-{ }
+{
+    setAttribute(Qt::WA_DontShowOnScreen);
+}
 
 void QPageSetupDialog::setVisible(bool visible)
 {
@@ -172,6 +176,8 @@ void QPageSetupDialog::setVisible(bool visible)
     if (!visible == !isCurrentlyVisible)
         return;
 
+    QDialog::setVisible(visible);
+
     if (visible) {
         d->openCocoaPageLayout(parentWidget() ? Qt::WindowModal
                                               : Qt::ApplicationModal);
@@ -191,10 +197,15 @@ int QPageSetupDialog::exec()
     if (d->printer->outputFormat() != QPrinter::NativeFormat)
         return Rejected;
 
+    QDialog::setVisible(true);
+
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
     d->openCocoaPageLayout(Qt::ApplicationModal);
     d->closeCocoaPageLayout();
     [pool release];
+
+    QDialog::setVisible(false);
+
     return result();
 }
 

src/printsupport/dialogs/qpagesetupdialog_win.cpp

@@ -58,11 +58,13 @@ class QPageSetupDialogPrivate : public QAbstractPageSetupDialogPrivate
 QPageSetupDialog::QPageSetupDialog(QPrinter *printer, QWidget *parent)
     : QAbstractPageSetupDialog(*(new QPageSetupDialogPrivate), printer, parent)
 {
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 QPageSetupDialog::QPageSetupDialog(QWidget *parent)
     : QAbstractPageSetupDialog(*(new QPageSetupDialogPrivate), 0, parent)
 {
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 int QPageSetupDialog::exec()
@@ -124,7 +126,9 @@ int QPageSetupDialog::exec()
     psd.rtMargin.right  = marginRect.width()  / multiplier;;
     psd.rtMargin.bottom = marginRect.height() / multiplier;;
 
+    QDialog::setVisible(true);
     bool result = PageSetupDlg(&psd);
+    QDialog::setVisible(false);
     if (result) {
         ep->readDevnames(psd.hDevNames);
         ep->readDevmode(psd.hDevMode);

src/printsupport/dialogs/qprintdialog_mac.mm

@@ -243,6 +243,7 @@ QPrintDialog::QPrintDialog(QPrinter *printer, QWidget *parent)
     Q_D(QPrintDialog);
     if (!warnIfNotNative(d->printer))
         return;
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 QPrintDialog::QPrintDialog(QWidget *parent)
@@ -251,6 +252,7 @@ QPrintDialog::QPrintDialog(QWidget *parent)
     Q_D(QPrintDialog);
     if (!warnIfNotNative(d->printer))
         return;
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 QPrintDialog::~QPrintDialog()
@@ -263,10 +265,15 @@ int QPrintDialog::exec()
     if (!warnIfNotNative(d->printer))
         return QDialog::Rejected;
 
+    QDialog::setVisible(true);
+
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
     d->openCocoaPrintPanel(Qt::ApplicationModal);
     d->closeCocoaPrintPanel();
     [pool release];
+
+    QDialog::setVisible(false);
+
     return result();
 }
 
@@ -286,6 +293,8 @@ void QPrintDialog::setVisible(bool visible)
     if (d->printer->outputFormat() != QPrinter::NativeFormat)
         return;
 
+    QDialog::setVisible(visible);
+
     if (visible) {
         d->openCocoaPrintPanel(parentWidget() ? Qt::WindowModal
                                               : Qt::ApplicationModal);

src/printsupport/dialogs/qprintdialog_win.cpp

@@ -193,6 +193,7 @@ QPrintDialog::QPrintDialog(QPrinter *printer, QWidget *parent)
     if (!warnIfNotNative(d->printer))
         return;
     d->ep = static_cast<QWin32PrintEngine *>(d->printer->paintEngine())->d_func();
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 QPrintDialog::QPrintDialog(QWidget *parent)
@@ -202,6 +203,7 @@ QPrintDialog::QPrintDialog(QWidget *parent)
     if (!warnIfNotNative(d->printer))
         return;
     d->ep = static_cast<QWin32PrintEngine *>(d->printer->paintEngine())->d_func();
+    setAttribute(Qt::WA_DontShowOnScreen);
 }
 
 QPrintDialog::~QPrintDialog()
@@ -230,10 +232,7 @@ int QPrintDialogPrivate::openWindowsPrintDialogModally()
     if (parent == 0)
         parent = q;
 
-    QWidget modal_widget;
-    modal_widget.setAttribute(Qt::WA_NoChildEventsForParent, true);
-    modal_widget.setParent(parent, Qt::Window);
-    QApplicationPrivate::enterModal(&modal_widget);
+    q->QDialog::setVisible(true);
 
     HGLOBAL *tempDevNames = ep->createDevNames();
 
@@ -274,7 +273,7 @@ int QPrintDialogPrivate::openWindowsPrintDialogModally()
         }
     } while (!done);
 
-    QApplicationPrivate::leaveModal(&modal_widget);
+    q->QDialog::setVisible(false);
 
 //    qt_win_eatMouseMove();