mydecoration.cpp Example File
qws/simpledecoration/mydecoration.cpp

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 #include <QtGui>
 #include "mydecoration.h"

 /* XPM */
 static const char * const _close_button[] = {
 "16 16 3 1",
 "  c none",
 ". c #ffafaf",
 "x c #000000",
 "                ",
 " xxxxxxxxxxxxxx ",
 " x............x ",
 " x.x........x.x ",
 " x..x......x..x ",
 " x...x....x...x ",
 " x....x..x....x ",
 " x.....xx.....x ",
 " x.....xx.....x ",
 " x....x..x....x ",
 " x...x....x...x ",
 " x..x......x..x ",
 " x.x........x.x ",
 " x............x ",
 " xxxxxxxxxxxxxx ",
 "                "};

 static const char * const _normalize_button[] = {
 "16 16 4 1",
 "  c none",
 ". c #dfdfff",
 "o c #7f7f7f",
 "x c #000000",
 "                ",
 " xxxxxxxxxxxxxx ",
 " xx...........x ",
 " x.x..........x ",
 " x..x..x......x ",
 " x...xxx......x ",
 " x...xxx......x ",
 " x..xxxx......x ",
 " x............x ",
 " x.......xxxx.x ",
 " x.......x..x.x ",
 " x.......x..x.x ",
 " x.......xxxx.x ",
 " x............x ",
 " xxxxxxxxxxxxxx ",
 "                "};

 static const char * const _maximize_button[] = {
 "16 16 4 1",
 "  c none",
 ". c #dfdfff",
 "o c #7f7f7f",
 "x c #000000",
 "                ",
 " xxxxxxxxxxxxxx ",
 " x............x ",
 " x.......xxxx.x ",
 " x........xxx.x ",
 " x........xxx.x ",
 " x.......x..x.x ",
 " x......x.....x ",
 " x.....x......x ",
 " x.oooo.......x ",
 " x.o..o.......x ",
 " x.o..o.......x ",
 " x.oooo.......x ",
 " x............x ",
 " xxxxxxxxxxxxxx ",
 "                "};

 static const char * const _help_button[] = {
 "16 16 3 1",
 "  c none",
 ". c #afffdf",
 "x c #000000",
 "                ",
 " xxxxxxxxxxxxxx ",
 " x............x ",
 " x....xxxx....x ",
 " x..xx....xx..x ",
 " x.xx......xx.x ",
 " x.xx......xx.x ",
 " x........xx..x ",
 " x......xx....x ",
 " x.....xx.....x ",
 " x.....xx.....x ",
 " x............x ",
 " x.....xx.....x ",
 " x............x ",
 " xxxxxxxxxxxxxx ",
 "                "};

 MyDecoration::MyDecoration()
     : QDecorationDefault()
 {
     border = 4;
     titleHeight = 24;
     buttonWidth = 20;
     buttonHeight = 20;
     buttonMargin = 2;
     buttonHints << Qt::Window
                 << Qt::WindowMaximizeButtonHint
                 << Qt::WindowContextHelpButtonHint;
     //! [constructor start]

     //! [map window flags to decoration regions]
     buttonHintMap[Qt::Window] = Close;
     buttonHintMap[Qt::WindowMaximizeButtonHint] = Maximize;
     buttonHintMap[Qt::WindowContextHelpButtonHint] = Help;
     //! [map window flags to decoration regions]

     //! [map decoration regions to pixmaps]
     normalButtonPixmaps[Close] = QPixmap(_close_button);
     normalButtonPixmaps[Maximize] = QPixmap(_maximize_button);
     normalButtonPixmaps[Normalize] = QPixmap(_normalize_button);
     normalButtonPixmaps[Help] = QPixmap(_help_button);

     maximizedButtonPixmaps[Close] = QPixmap(_close_button);
     maximizedButtonPixmaps[Maximize] = QPixmap(_normalize_button);
     maximizedButtonPixmaps[Normalize] = QPixmap(_normalize_button);
     maximizedButtonPixmaps[Help] = QPixmap(_help_button);
     //! [map decoration regions to pixmaps]

     //! [constructor end]
     stateRegions << Close << Maximize << Help;
 }

 QRegion MyDecoration::region(const QWidget *widget, const QRect &insideRect,
                              int decorationRegion)
 {
     //! [region start]
     //! [calculate the positions of buttons based on the window flags used]
     QHash<DecorationRegion, int> buttons;
     Qt::WindowFlags flags = widget->windowFlags();
     int dx = -buttonMargin - buttonWidth;

     foreach (Qt::WindowType button, buttonHints) {
         if (flags & button) {
             int x = (buttons.size() + 1) * dx;
             buttons[buttonHintMap[button]] = x;
         }
     }
     //! [calculate the positions of buttons based on the window flags used]

     //! [calculate the extent of the title]
     int titleRightMargin = buttons.size() * dx;

     QRect outsideRect(insideRect.left() - border,
                       insideRect.top() - titleHeight - border,
                       insideRect.width() + 2 * border,
                       insideRect.height() + titleHeight + 2 * border);
     //! [calculate the extent of the title]

     //! [check for all regions]
     QRegion region;

     if (decorationRegion == All) {
         region += QRegion(outsideRect) - QRegion(insideRect);
         return region;
     }
     //! [check for all regions]

     //! [compose a region based on the decorations specified]
     if (decorationRegion & Title) {
         QRect rect = outsideRect.adjusted(border, border, -border, 0);
         rect.setHeight(titleHeight);

         // Adjust the width to accommodate buttons.
         rect.setWidth(qMax(0, rect.width() + titleRightMargin));
         region += rect;
     }
     if (decorationRegion & Top) {
         QRect rect = outsideRect.adjusted(border, 0, -border, 0);
         rect.setHeight(border);
         region += rect;
     }
     if (decorationRegion & Left) {
         QRect rect = outsideRect.adjusted(0, border, 0, -border);
         rect.setWidth(border);
         region += rect;
     }
     if (decorationRegion & Right) {
         QRect rect = outsideRect.adjusted(0, border, 0, -border);
         rect.setLeft(rect.right() + 1 - border);
         region += rect;
     }
     if (decorationRegion & Bottom) {
         QRect rect = outsideRect.adjusted(border, 0, -border, 0);
         rect.setTop(rect.bottom() + 1 - border);
         region += rect;
     }
     if (decorationRegion & TopLeft) {
         QRect rect = outsideRect;
         rect.setWidth(border);
         rect.setHeight(border);
         region += rect;
     }
     if (decorationRegion & TopRight) {
         QRect rect = outsideRect;
         rect.setLeft(rect.right() + 1 - border);
         rect.setHeight(border);
         region += rect;
     }
     if (decorationRegion & BottomLeft) {
         QRect rect = outsideRect;
         rect.setWidth(border);
         rect.setTop(rect.bottom() + 1 - border);
         region += rect;
     }
     if (decorationRegion & BottomRight) {
         QRect rect = outsideRect;
         rect.setLeft(rect.right() + 1 - border);
         rect.setTop(rect.bottom() + 1 - border);
         region += rect;
     }
     //! [compose a region based on the decorations specified]

     //! [add a region for each button only if it is present]
     foreach (QDecoration::DecorationRegion testRegion, stateRegions) {
         if (decorationRegion & testRegion and buttons.contains(testRegion)) {
             // Inside the title rectangle
             QRect rect = outsideRect.adjusted(border, border, -border, 0);
             rect.setHeight(titleHeight);

             dx = buttons[testRegion];
             rect.setLeft(rect.right() + 1 + dx);
             rect.setWidth(buttonWidth + buttonMargin);
             region += rect;
         }
     }
     //! [add a region for each button only if it is present]

     //! [region end]
     return region;
 }

 bool MyDecoration::paint(QPainter *painter, const QWidget *widget,
                          int decorationRegion, DecorationState state)
 {
     if (decorationRegion == None)
         return false;
     //! [paint start]

     //! [paint different regions]
     bool handled = false;

     QPalette palette = QApplication::palette();
     QHash<DecorationRegion, QPixmap> buttonPixmaps;

     if (widget->windowState() == Qt::WindowMaximized)
         buttonPixmaps = maximizedButtonPixmaps;
     else
         buttonPixmaps = normalButtonPixmaps;

     if (decorationRegion & Title) {
         QRect rect = QDecoration::region(widget, Title).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Base));
         painter->save();
         painter->setPen(QPen(palette.color(QPalette::Text)));
         painter->drawText(rect, Qt::AlignCenter, widget->windowTitle());
         painter->restore();
         handled = true;
     }
     if (decorationRegion & Top) {
         QRect rect = QDecoration::region(widget, Top).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & Left) {
         QRect rect = QDecoration::region(widget, Left).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & Right) {
         QRect rect = QDecoration::region(widget, Right).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & Bottom) {
         QRect rect = QDecoration::region(widget, Bottom).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & TopLeft) {
         QRect rect = QDecoration::region(widget, TopLeft).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & TopRight) {
         QRect rect = QDecoration::region(widget, TopRight).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & BottomLeft) {
         QRect rect = QDecoration::region(widget, BottomLeft).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     if (decorationRegion & BottomRight) {
         QRect rect = QDecoration::region(widget, BottomRight).boundingRect();
         painter->fillRect(rect, palette.brush(QPalette::Dark));
         handled = true;
     }
     //! [paint different regions]

     //! [paint buttons]
     int margin = (titleHeight - 16) / 2;
     Qt::WindowFlags flags = widget->windowFlags();

     foreach (DecorationRegion testRegion, stateRegions) {
         if (decorationRegion & testRegion && flags & buttonHintMap.key(testRegion)) {
             QRect rect = QDecoration::region(
                 widget, testRegion).boundingRect();
             painter->fillRect(rect, palette.brush(QPalette::Base));

             QRect buttonRect = rect.adjusted(0, margin, -buttonMargin - margin,
                                              -buttonMargin);
             painter->drawPixmap(buttonRect.topLeft(), buttonPixmaps[testRegion]);
             handled = true;
         }
     }
     //! [paint buttons]

     //! [paint end]
     return handled;
 }