Consolidate StandardButton, ButtonRole and related static functions

Moving them into QPlatformDialogHelper for the convenience of both
widgets and QtQuick.Dialogs.  The main reason is to ensure that
QtQuick.Dialogs does not need to depend on the widgets module, in
order to re-implement the button box concept in a generic dialog.

Change-Id: If400d215338d7cb6dade39d9de60e50b5e7515ef
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

2 files changed, 30 insertions, 97 deletions

diff --git a/src/widgets/widgets/qdialogbuttonbox.cpp b/src/widgets/widgets/qdialogbuttonbox.cpp
index d28fb66551..e24247b02f 100644
--- a/src/widgets/widgets/qdialogbuttonbox.cpp
+++ b/src/widgets/widgets/qdialogbuttonbox.cpp
@@ -150,77 +150,6 @@ QT_BEGIN_NAMESPACE
     \sa QMessageBox, QPushButton, QDialog
 */
 
-enum {
-    AcceptRole      = QDialogButtonBox::AcceptRole,
-    RejectRole      = QDialogButtonBox::RejectRole,
-    DestructiveRole = QDialogButtonBox::DestructiveRole,
-    ActionRole      = QDialogButtonBox::ActionRole,
-    HelpRole        = QDialogButtonBox::HelpRole,
-    YesRole         = QDialogButtonBox::YesRole,
-    NoRole          = QDialogButtonBox::NoRole,
-    ApplyRole       = QDialogButtonBox::ApplyRole,
-    ResetRole       = QDialogButtonBox::ResetRole,
-
-    AlternateRole   = 0x10000000,
-    Stretch         = 0x20000000,
-    EOL             = 0x40000000,
-    Reverse         = 0x80000000
-};
-
-static QDialogButtonBox::ButtonRole roleFor(QDialogButtonBox::StandardButton button)
-{
-    return static_cast<QDialogButtonBox::ButtonRole>(QMessageDialogOptions::buttonRole(
-        static_cast<QMessageDialogOptions::StandardButton>(button)));
-}
-
-static const uint layouts[2][5][14] =
-{
-    // Qt::Horizontal
-    {
-        // WinLayout
-        { ResetRole, Stretch, YesRole, AcceptRole, AlternateRole, DestructiveRole, NoRole, ActionRole, RejectRole, ApplyRole,
-           HelpRole, EOL, EOL, EOL },
-
-        // MacLayout
-        { HelpRole, ResetRole, ApplyRole, ActionRole, Stretch, DestructiveRole | Reverse,
-          AlternateRole | Reverse, RejectRole | Reverse, AcceptRole | Reverse, NoRole | Reverse, YesRole | Reverse, EOL, EOL },
-
-        // KdeLayout
-        { HelpRole, ResetRole, Stretch, YesRole, NoRole, ActionRole, AcceptRole, AlternateRole,
-          ApplyRole, DestructiveRole, RejectRole, EOL },
-
-        // GnomeLayout
-        { HelpRole, ResetRole, Stretch, ActionRole, ApplyRole | Reverse, DestructiveRole | Reverse,
-          AlternateRole | Reverse, RejectRole | Reverse, AcceptRole | Reverse, NoRole | Reverse, YesRole | Reverse, EOL },
-
-        // Mac modeless
-        { ResetRole, ApplyRole, ActionRole, Stretch, HelpRole, EOL, EOL, EOL, EOL, EOL, EOL, EOL, EOL, EOL }
-    },
-
-    // Qt::Vertical
-    {
-        // WinLayout
-        { ActionRole, YesRole, AcceptRole, AlternateRole, DestructiveRole, NoRole, RejectRole, ApplyRole, ResetRole,
-          HelpRole, Stretch, EOL, EOL, EOL },
-
-        // MacLayout
-        { YesRole, NoRole, AcceptRole, RejectRole, AlternateRole, DestructiveRole, Stretch, ActionRole, ApplyRole,
-          ResetRole, HelpRole, EOL, EOL },
-
-        // KdeLayout
-        { AcceptRole, AlternateRole, ApplyRole, ActionRole, YesRole, NoRole, Stretch, ResetRole,
-          DestructiveRole, RejectRole, HelpRole, EOL },
-
-        // GnomeLayout
-        { YesRole, NoRole, AcceptRole, RejectRole, AlternateRole, DestructiveRole, ApplyRole, ActionRole, Stretch,
-          ResetRole, HelpRole, EOL, EOL, EOL },
-
-        // Mac modeless
-        { ActionRole, ApplyRole, ResetRole, Stretch, HelpRole, EOL, EOL, EOL, EOL, EOL, EOL, EOL, EOL, EOL }
-    }
-};
-
-
 class QDialogButtonBoxPrivate : public QWidgetPrivate
 {
     Q_DECLARE_PUBLIC(QDialogButtonBox)
@@ -323,7 +252,8 @@ void QDialogButtonBoxPrivate::layoutButtons()
     int tmpPolicy = layoutPolicy;
 
     static const int M = 5;
-    static const int ModalRoles[M] = { AcceptRole, RejectRole, DestructiveRole, YesRole, NoRole };
+    static const int ModalRoles[M] = { QPlatformDialogHelper::AcceptRole, QPlatformDialogHelper::RejectRole,
+        QPlatformDialogHelper::DestructiveRole, QPlatformDialogHelper::YesRole, QPlatformDialogHelper::NoRole };
     if (tmpPolicy == QDialogButtonBox::MacLayout) {
         bool hasModalButton = false;
         for (int i = 0; i < M; ++i) {
@@ -336,23 +266,24 @@ void QDialogButtonBoxPrivate::layoutButtons()
             tmpPolicy = 4;  // Mac modeless
     }
 
-    const uint *currentLayout = layouts[orientation == Qt::Vertical][tmpPolicy];
+    const quint32 *currentLayout = QPlatformDialogHelper::buttonLayout(
+        orientation, static_cast<QPlatformDialogHelper::ButtonLayout>(tmpPolicy));
 
     if (center)
         buttonLayout->addStretch();
 
-    QList<QAbstractButton *> acceptRoleList = buttonLists[AcceptRole];
+    QList<QAbstractButton *> acceptRoleList = buttonLists[QPlatformDialogHelper::AcceptRole];
 
-    while (*currentLayout != EOL) {
-        int role = (*currentLayout & ~Reverse);
-        bool reverse = (*currentLayout & Reverse);
+    while (*currentLayout != QPlatformDialogHelper::EOL) {
+        int role = (*currentLayout & ~QPlatformDialogHelper::Reverse);
+        bool reverse = (*currentLayout & QPlatformDialogHelper::Reverse);
 
         switch (role) {
-        case Stretch:
+        case QPlatformDialogHelper::Stretch:
             if (!center)
                 buttonLayout->addStretch();
             break;
-        case AcceptRole: {
+        case QPlatformDialogHelper::AcceptRole: {
             if (acceptRoleList.isEmpty())
                 break;
             // Only the first one
@@ -361,7 +292,7 @@ void QDialogButtonBoxPrivate::layoutButtons()
             button->show();
         }
             break;
-        case AlternateRole:
+        case QPlatformDialogHelper::AlternateRole:
             {
                 if (acceptRoleList.size() < 2)
                     break;
@@ -370,7 +301,7 @@ void QDialogButtonBoxPrivate::layoutButtons()
                 addButtonsToLayout(list, reverse);
             }
             break;
-        case DestructiveRole:
+        case QPlatformDialogHelper::DestructiveRole:
             {
                 const QList<QAbstractButton *> &list = buttonLists[role];
 
@@ -396,13 +327,13 @@ void QDialogButtonBoxPrivate::layoutButtons()
                     buttonLayout->addSpacing(MacGap);
             }
             break;
-        case RejectRole:
-        case ActionRole:
-        case HelpRole:
-        case YesRole:
-        case NoRole:
-        case ApplyRole:
-        case ResetRole:
+        case QPlatformDialogHelper::RejectRole:
+        case QPlatformDialogHelper::ActionRole:
+        case QPlatformDialogHelper::HelpRole:
+        case QPlatformDialogHelper::YesRole:
+        case QPlatformDialogHelper::NoRole:
+        case QPlatformDialogHelper::ApplyRole:
+        case QPlatformDialogHelper::ResetRole:
             addButtonsToLayout(buttonLists[role], reverse);
         }
         ++currentLayout;
@@ -484,8 +415,9 @@ QPushButton *QDialogButtonBoxPrivate::createButton(QDialogButtonBox::StandardBut
     if (style != QApplication::style()) // Propagate style
         button->setStyle(style);
     standardButtonHash.insert(button, sbutton);
-    if (roleFor(sbutton) != QDialogButtonBox::InvalidRole) {
-        addButton(button, roleFor(sbutton), doLayout);
+    QPlatformDialogHelper::ButtonRole role = QPlatformDialogHelper::buttonRole(static_cast<QPlatformDialogHelper::StandardButton>(sbutton));
+    if (role != QPlatformDialogHelper::InvalidRole) {
+        addButton(button, static_cast<QDialogButtonBox::ButtonRole>(role), doLayout);
     } else {
         qWarning("QDialogButtonBox::createButton: Invalid ButtonRole, button not added");
     }
@@ -934,15 +866,15 @@ void QDialogButtonBoxPrivate::_q_handleButtonClicked()
         emit q->clicked(button);
 
         switch (q->buttonRole(button)) {
-        case AcceptRole:
-        case YesRole:
+        case QPlatformDialogHelper::AcceptRole:
+        case QPlatformDialogHelper::YesRole:
             emit q->accepted();
             break;
-        case RejectRole:
-        case NoRole:
+        case QPlatformDialogHelper::RejectRole:
+        case QPlatformDialogHelper::NoRole:
             emit q->rejected();
             break;
-        case HelpRole:
+        case QPlatformDialogHelper::HelpRole:
             emit q->helpRequested();
             break;
         default:
diff --git a/src/widgets/widgets/qdialogbuttonbox.h b/src/widgets/widgets/qdialogbuttonbox.h
index d8e1a997d4..5cd94f88b0 100644
--- a/src/widgets/widgets/qdialogbuttonbox.h
+++ b/src/widgets/widgets/qdialogbuttonbox.h
@@ -61,7 +61,7 @@ class Q_WIDGETS_EXPORT QDialogButtonBox : public QWidget
 
 public:
     enum ButtonRole {
-        // keep this in sync with QMessageBox::ButtonRole
+        // keep this in sync with QMessageBox::ButtonRole and QPlatformDialogHelper::ButtonRole
         InvalidRole = -1,
         AcceptRole,
         RejectRole,
@@ -77,7 +77,7 @@ public:
     };
 
     enum StandardButton {
-        // keep this in sync with QMessageBox::StandardButton
+        // keep this in sync with QMessageBox::StandardButton and QPlatformDialogHelper::StandardButton
         NoButton           = 0x00000000,
         Ok                 = 0x00000400,
         Save               = 0x00000800,
@@ -107,6 +107,7 @@ public:
     Q_DECLARE_FLAGS(StandardButtons, StandardButton)
 
     enum ButtonLayout {
+        // keep this in sync with QMessageBox::ButtonLayout and QPlatformDialogHelper::ButtonLayout
         WinLayout,
         MacLayout,
         KdeLayout,