Introduce a QVariant themeHint() to QPlatformTheme.

Start on removing platform-specific code from QtWidgets.

Change-Id: Ic2163a0ce6f2db2151cdf7ca93766b2d861eeb55
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformtheme_qpa.cpp b/src/gui/kernel/qplatformtheme_qpa.cpp
index b4a177f915..22d4452f4e 100644
--- a/src/gui/kernel/qplatformtheme_qpa.cpp
+++ b/src/gui/kernel/qplatformtheme_qpa.cpp
@@ -41,8 +41,36 @@
 
 #include "qplatformtheme_qpa.h"
 
+#include <QtCore/QVariant>
+
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformTheme
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+    \brief The QPlatformTheme class allows customizing the UI based on themes.
+
+*/
+
+/*!
+    \enum QPlatformTheme::ThemeHint
+
+    This enum describes the available theme hints.
+
+    \value TextCursorWidth  (int) Determines the width of the text cursor.
+
+    \value DropShadow       (bool) Determines whether the drop shadow effect for
+                            tooltips or whatsthis is enabled.
+
+    \value MaximumScrollBarDragDistance (int) Determines the value returned by
+                            QStyle::pixelMetric(PM_MaximumDragDistance)
+
+    \sa themeHint(), QStyle::pixelMetric()
+*/
+
 QPlatformMenu *QPlatformTheme::createPlatformMenu(QMenu *menu) const
 {
     Q_UNUSED(menu);
@@ -67,4 +95,17 @@ QPlatformDialogHelper *QPlatformTheme::createPlatformDialogHelper(QDialog *dialo
     return 0;
 }
 
+QVariant QPlatformTheme::themeHint(ThemeHint hint) const
+{
+    switch (hint) {
+    case TextCursorWidth:
+        return QVariant(1);
+    case DropShadow:
+        return QVariant(false);
+    case MaximumScrollBarDragDistance:
+        return QVariant(-1);
+    }
+    return QVariant();
+}
+
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qplatformtheme_qpa.h b/src/gui/kernel/qplatformtheme_qpa.h
index 06a81fda4a..c3e5b677a2 100644
--- a/src/gui/kernel/qplatformtheme_qpa.h
+++ b/src/gui/kernel/qplatformtheme_qpa.h
@@ -56,15 +56,24 @@ class QPlatformMenu;
 class QPlatformMenuBar;
 class QPlatformDialogHelper;
 class QDialog;
+class QVariant;
 
 class Q_GUI_EXPORT QPlatformTheme
 {
 public:
+    enum ThemeHint {
+        TextCursorWidth,
+        DropShadow,
+        MaximumScrollBarDragDistance
+    };
+
     virtual QPlatformMenu *createPlatformMenu(QMenu *menu = 0) const;
     virtual QPlatformMenuBar *createPlatformMenuBar(QMenuBar *menuBar = 0) const;
 
     virtual bool usePlatformNativeDialog(const QDialog *dialog = 0) const;
     virtual QPlatformDialogHelper *createPlatformDialogHelper(QDialog *dialog = 0) const;
+
+    virtual QVariant themeHint(ThemeHint hint) const;
 };
 
 QT_END_NAMESPACE