Fix usage of deprecated API QMessageBox::standardIcon

Instead use the style to get the icon and get the pixmap from there.
Emulates what QMessageBox::setIcon(QMessageBox::Icon) does.

Change-Id: Ic20d55070d510773eb194dc695689954b4862a2f
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/utils/checkablemessagebox.cpp

@@ -32,6 +32,7 @@
 #include <QLabel>
 #include <QPushButton>
 #include <QSettings>
+#include <QStyle>
 
 /*!
     \class Utils::CheckableMessageBox
@@ -107,6 +108,7 @@ public:
     QCheckBox *checkBox = nullptr;
     QDialogButtonBox *buttonBox = nullptr;
     QAbstractButton *clickedButton = nullptr;
+    QMessageBox::Icon icon = QMessageBox::NoIcon;
 };
 
 CheckableMessageBox::CheckableMessageBox(QWidget *parent) :
@@ -148,17 +150,53 @@ void CheckableMessageBox::setText(const QString &t)
     d->messageLabel->setText(t);
 }
 
-QPixmap CheckableMessageBox::iconPixmap() const
+QMessageBox::Icon CheckableMessageBox::icon() const
 {
-    if (const QPixmap *p = d->pixmapLabel->pixmap())
-        return QPixmap(*p);
+    return d->icon;
+}
+
+// See QMessageBoxPrivate::standardIcon
+static QPixmap pixmapForIcon(QMessageBox::Icon icon, QWidget *w)
+{
+    const QStyle *style = w ? w->style() : QApplication::style();
+    const int iconSize = style->pixelMetric(QStyle::PM_MessageBoxIconSize, nullptr, w);
+    QIcon tmpIcon;
+    switch (icon) {
+    case QMessageBox::Information:
+        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxInformation, nullptr, w);
+        break;
+    case QMessageBox::Warning:
+        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxWarning, nullptr, w);
+        break;
+    case QMessageBox::Critical:
+        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxCritical, nullptr, w);
+        break;
+    case QMessageBox::Question:
+        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxQuestion, nullptr, w);
+        break;
+    default:
+        break;
+    }
+    if (!tmpIcon.isNull()) {
+        QWindow *window = nullptr;
+        if (w) {
+            window = w->windowHandle();
+            if (!window) {
+                if (const QWidget *nativeParent = w->nativeParentWidget())
+                    window = nativeParent->windowHandle();
+            }
+        }
+        return tmpIcon.pixmap(window, QSize(iconSize, iconSize));
+    }
     return QPixmap();
 }
 
-void CheckableMessageBox::setIconPixmap(const QPixmap &p)
+void CheckableMessageBox::setIcon(QMessageBox::Icon icon)
 {
-    d->pixmapLabel->setPixmap(p);
-    d->pixmapLabel->setVisible(!p.isNull());
+    d->icon = icon;
+    const QPixmap pixmap = pixmapForIcon(icon, this);
+    d->pixmapLabel->setPixmap(pixmap);
+    d->pixmapLabel->setVisible(!pixmap.isNull());
 }
 
 bool CheckableMessageBox::isChecked() const
@@ -239,7 +277,7 @@ CheckableMessageBox::question(QWidget *parent,
 {
     CheckableMessageBox mb(parent);
     mb.setWindowTitle(title);
-    mb.setIconPixmap(QMessageBox::standardIcon(QMessageBox::Question));
+    mb.setIcon(QMessageBox::Question);
     mb.setText(question);
     mb.setCheckBoxText(checkBoxText);
     mb.setChecked(*checkBoxSetting);
@@ -261,7 +299,7 @@ CheckableMessageBox::information(QWidget *parent,
 {
     CheckableMessageBox mb(parent);
     mb.setWindowTitle(title);
-    mb.setIconPixmap(QMessageBox::standardIcon(QMessageBox::Information));
+    mb.setIcon(QMessageBox::Information);
     mb.setText(text);
     mb.setCheckBoxText(checkBoxText);
     mb.setChecked(*checkBoxSetting);
@@ -297,9 +335,7 @@ void initDoNotAskAgainMessageBox(CheckableMessageBox &messageBox, const QString
                                  DoNotAskAgainType type)
 {
     messageBox.setWindowTitle(title);
-    messageBox.setIconPixmap(QMessageBox::standardIcon(type == Information
-                                               ? QMessageBox::Information
-                                               : QMessageBox::Question));
+    messageBox.setIcon(type == Information ? QMessageBox::Information : QMessageBox::Question);
     messageBox.setText(text);
     messageBox.setCheckBoxVisible(true);
     messageBox.setCheckBoxText(type == Information ? CheckableMessageBox::msgDoNotShowAgain()

src/libs/utils/checkablemessagebox.h

@@ -42,7 +42,7 @@ class QTCREATOR_UTILS_EXPORT CheckableMessageBox : public QDialog
 {
     Q_OBJECT
     Q_PROPERTY(QString text READ text WRITE setText)
-    Q_PROPERTY(QPixmap iconPixmap READ iconPixmap WRITE setIconPixmap)
+    Q_PROPERTY(QMessageBox::Icon icon READ icon WRITE setIcon)
     Q_PROPERTY(bool isChecked READ isChecked WRITE setChecked)
     Q_PROPERTY(QString checkBoxText READ checkBoxText WRITE setCheckBoxText)
     Q_PROPERTY(QDialogButtonBox::StandardButtons buttons READ standardButtons WRITE setStandardButtons)
@@ -109,9 +109,8 @@ public:
     QDialogButtonBox::StandardButton defaultButton() const;
     void setDefaultButton(QDialogButtonBox::StandardButton s);
 
-    // See static QMessageBox::standardPixmap()
-    QPixmap iconPixmap() const;
-    void setIconPixmap (const QPixmap &p);
+    QMessageBox::Icon icon() const;
+    void setIcon(QMessageBox::Icon icon);
 
     // Query the result
     QAbstractButton *clickedButton() const;

src/plugins/coreplugin/editormanager/editormanager.cpp

@@ -537,7 +537,7 @@ bool EditorManagerPrivate::skipOpeningBigTextFile(const QString &filePath)
         messageBox.setText(text);
         messageBox.setStandardButtons(QDialogButtonBox::Yes|QDialogButtonBox::No);
         messageBox.setDefaultButton(QDialogButtonBox::No);
-        messageBox.setIconPixmap(QMessageBox::standardIcon(QMessageBox::Question));
+        messageBox.setIcon(QMessageBox::Question);
         messageBox.setCheckBoxVisible(true);
         messageBox.setCheckBoxText(CheckableMessageBox::msgDoNotAskAgain());
         messageBox.exec();

src/plugins/vcsbase/vcsbasesubmiteditor.cpp

@@ -569,7 +569,7 @@ VcsBaseSubmitEditor::PromptSubmitResult
     const QString commitName = plugin->commitDisplayName();
     mb.setWindowTitle(tr("Close %1 %2 Editor")
                       .arg(plugin->versionControl()->displayName(), commitName));
-    mb.setIconPixmap(QMessageBox::standardIcon(QMessageBox::Question));
+    mb.setIcon(QMessageBox::Question);
     QString message;
     if (canCommit) {
         message = tr("What do you want to do with these changes?");