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# mydecoration.cpp Example File

qws/simpledecoration/mydecoration.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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;

         buttonHintMap[Qt::Window] = Close;
         buttonHintMap[Qt::WindowMaximizeButtonHint] = Maximize;
         buttonHintMap[Qt::WindowContextHelpButtonHint] = Help;

         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);

         stateRegions << Close << Maximize << Help;
     }

     QRegion MyDecoration::region(const QWidget *widget, const QRect &insideRect,
                                  int decorationRegion)
     {
         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;
             }
         }

         int titleRightMargin = buttons.size() * dx;

         QRect outsideRect(insideRect.left() - border,
                           insideRect.top() - titleHeight - border,
                           insideRect.width() + 2 * border,
                           insideRect.height() + titleHeight + 2 * border);

         QRegion region;

         if (decorationRegion == All) {
             region += QRegion(outsideRect) - QRegion(insideRect);
             return region;
         }

         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;
         }

         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;
             }
         }

         return region;
     }

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

         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;
         }

         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;
             }
         }

         return handled;
     }