Broken selected-item ornament with Windows 7 Theme: Menu item icon sized using QStyle::PM_SmallIconSize override.



  • Broken selected-item ornament with Windows 7 Theme: Menu item icon sized using QStyle::PM_SmallIconSize override:

    The ornament which the Windows 7 Theme puts on a selected menu item icon -- made wider using a QStyleProxy overriding the QStyle::PM_SmallIconSize property (see below) -- isn't drawn correctly. [Qt 4.8.5 on Windows 7]. SEE the light blue rounded square ...

    !http://cadswes2.colorado.edu/~philw/2013/IconMenuOrnProbWin7/images/detail1.png(Light Blue Rounded Rectangle is Wrong Size)!

    Note that the Bullet (dot) is part of the icon. This was done because checkable menu items (QActions) having an icon don't show a check indicator -- and we really want the check indicator. [ See thread: "Can Checkable QActions (menu items) with Icons also show check indicators?" ... http://qt-project.org/forums/viewthread/33325/ ].

    This problem doesn't exist with the Windows Classic Theme (right side):

    !http://cadswes2.colorado.edu/~philw/2013/IconMenuOrnProbWin7/images/detail2.png(Windows Classic Theme is OK)!

    Here is the QStyle::PM_SmallIconSize override code:

    @// QProxyStyle sublass to be installed on a QMenu needing to support
    // wider-than-usual icons. It overrides the QStyle::PM_SmallIconSize
    // property with the width of the QSize provided by the client.

    class QMenuIconSizeProxyStyle : public QProxyStyle
    {
    private:
    QSize _iconSize; // note: only the width is currently used.

    public:
    QMenuIconSizeProxyStyle() : QProxyStyle() {}

    void setIconSize (const QSize& iconSize) { _iconSize = iconSize; }

    int pixelMetric (QStyle::PixelMetric metric,
    const QStyleOption* option=NULL,
    const QWidget* widget=NULL) const override
    {
    if (metric == QStyle::PM_SmallIconSize)
    return (_iconSize.width());

      // Return base class result
      return QProxyStyle::pixelMetric (metric, option, widget);
    

    }
    };

    ... ... ...

    // Instantiate a QProxyStyle for a modified QStyle::PM_SmallIconSize
    // and install that on the QMenu.

    QMenuIconSizeProxyStyle* proxyStyle = new QMenuIconSizeProxyStyle;
    proxyStyle->setIconSize (maxIconSize); // QSize
    myMenu->setStyle (proxyStyle);@

    IS THERE some other QStyle Pixel Metric I can also override which would cause the selected-item Windows 7 ornament to draw correctly (around the full revised-width of the menu icon / check indicator area)? Or is there any other way to fix this?

    Reference: http://qt-project.org/doc/qt-4.8/qstyle.html#PixelMetric-enum
    [Thank you in advance].


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