runtime/kstyles/oxygen/elements/scrollbar.cpp

   1 /*
   2  * Copyright 2007 Matthew Woehlke <mw_triad@users.sourceforge.net>
   3  * Copyright 2007 Casper Boemann <cbr@boemann.dk>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License version 2 as published by the Free Software Foundation.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "scrollbar.h"
  21
  22 #include <KColorUtils>
  23 #include <KColorScheme>
  24
  25 #include <QtGui/QPainter>
  26 #include <QtGui/QLinearGradient>
  27
  28 inline QColor alphaColor(QColor color, double alpha)
  29 {
  30     color.setAlphaF(alpha);
  31     return color;
  32 }
  33
  34 OxygenScrollbar::OxygenScrollbar(const QColor &c, double contrast) : color(c),
  35     light(KColorScheme::shade(c, KColorScheme::LightShade, contrast - 0.5)),
  36     mid(KColorScheme::shade(c, KColorScheme::MidShade, contrast)),
  37     dark(KColorScheme::shade(c, KColorScheme::DarkShade, contrast - 0.5)),
  38     shadow(KColorScheme::shade(c, KColorScheme::ShadowShade, contrast)),
  39     highlight(Qt::white)
  40 {
  41     double y = KColorUtils::luma(color);
  42     if (y > KColorUtils::luma(light)) {
  43         light = Qt::white;
  44         dark = KColorScheme::shade(c, KColorScheme::DarkShade, contrast);
  45     }
  46 }
  47
  48 void OxygenScrollbar::mask(QPainter &p, const QRectF &rect) const
  49 {
  50     double w = rect.width();
  51     double h = rect.height();
  52
  53     // drawRoundRect is too bloody hard to control to get the corners perfectly
  54     // square (i.e. circles not ellipses), so draw the mask in parts with real
  55     // circles
  56     p.setBrush(Qt::black); // color doesn't matter
  57     p.drawRect(rect.adjusted(7,0,-7,0));
  58     p.drawRect(rect.adjusted(0,7,0,-7));
  59     p.drawEllipse(QRectF(0,0,14,14));
  60     p.drawEllipse(QRectF(w-14,0,14,14));
  61     p.drawEllipse(QRectF(0,h-14,14,14));
  62     p.drawEllipse(QRectF(w-14,h-14,14,14));
  63
  64     // never draw outside the mask
  65     p.setCompositionMode(QPainter::CompositionMode_SourceAtop);
  66 }
  67
  68 QLinearGradient OxygenScrollbar::baseGradient(double width, Qt::Orientation orient) const
  69 {
  70     double x = 0.0, y1 = width, y2 = width;
  71     if (orient == Qt::Vertical)
  72         x = width * 0.6;
  73     else
  74         y2 = width * 0.4;
  75
  76     QLinearGradient gradient(0, y1, x, y2);
  77     gradient.setColorAt(0.0, color);
  78     gradient.setColorAt(1.0, mid);
  79
  80     return gradient;
  81 }
  82
  83 QLinearGradient OxygenScrollbar::shineGradient(double width, Qt::Orientation orient) const
  84 {
  85     double x = 0.0, y1 = -width, y2 = -width;
  86     if (orient == Qt::Vertical)
  87         x = width * 2.0;
  88     else
  89         y1 = width;
  90
  91     QLinearGradient gradient(0, y1, x, y2);
  92     gradient.setColorAt(0.0, light);
  93     gradient.setColorAt(0.5, alphaColor(color, 0.5));
  94     gradient.setColorAt(1.0, color);
  95
  96     return gradient;
  97 }
  98
  99 QLinearGradient OxygenScrollbar::shimmerGradient(double offset, Qt::Orientation orient) const
 100 {
 101     double x = 0.0, y = 0.0, xo = 0.0, yo = 0.0;
 102     if (orient == Qt::Vertical) {
 103         yo = offset;
 104         x = 14.4/2.0;
 105         y = 43.2/2.0;
 106     } else {
 107         xo = offset;
 108         x = 43.2/2.0;
 109         y = -14.4/2.0;
 110     }
 111
 112     // should tile every 48 units, with 1:3 slope
 113     QLinearGradient gradient(xo, yo, x+xo, y+yo);
 114     gradient.setSpread(QGradient::ReflectSpread);
 115     gradient.setColorAt(0.0, alphaColor(dark, 0.40));
 116     gradient.setColorAt(0.6, alphaColor(dark, 0.10));
 117     gradient.setColorAt(1.0, alphaColor(dark, 0.00));
 118
 119     return gradient;
 120 }
 121
 122 QLinearGradient OxygenScrollbar::dimGradient(Qt::Orientation orient) const
 123 {
 124     int x = 0, y = 0;
 125     if (orient == Qt::Vertical)
 126         y = 3*22;
 127     else
 128         x = 3*22;
 129
 130     QLinearGradient gradient(0, 0, x, y);
 131     gradient.setSpread(QGradient::ReflectSpread);
 132     gradient.setColorAt(0.00, alphaColor(dark, 1.0));
 133     gradient.setColorAt(0.19, alphaColor(dark, 0.3));
 134     gradient.setColorAt(0.27, alphaColor(dark, 0.0));
 135
 136     return gradient;
 137 }
 138
 139 QPixmap OxygenScrollbar::bevel(int width, int height, double w, double h, int rx, int ry) const
 140 {
 141     QPixmap pixmap(width, height);
 142     pixmap.fill(Qt::transparent);
 143
 144     QPainter p(&pixmap);
 145     p.setRenderHint(QPainter::Antialiasing);
 146     p.setPen(Qt::NoPen);
 147     p.setWindow(0, 0, int(w), int(h));
 148
 149     QRectF rect(0, 0, w, h);
 150
 151     // anti-highlight
 152     QLinearGradient ahGradient(0, 0, 0, 8);
 153     ahGradient.setColorAt(0.0, dark);
 154     ahGradient.setColorAt(0.9, dark);
 155     ahGradient.setColorAt(1.0, shadow);
 156     p.setBrush(ahGradient);
 157     p.drawRect(rect);
 158
 159     // anti-highlight mask
 160     p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
 161     p.setBrush(Qt::black);
 162     p.drawRoundRect(rect.adjusted(0, 1, 0, -1), rx, ry);
 163
 164     // bevel
 165     QLinearGradient bevelGradient(0, 0, 0, 8);
 166     bevelGradient.setColorAt(0.0, alphaColor(highlight, 0.4));
 167     bevelGradient.setColorAt(0.6, alphaColor(highlight, 0.4));
 168     bevelGradient.setColorAt(1.0, alphaColor(shadow, 0.8));
 169     p.setBrush(bevelGradient);
 170     p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
 171     p.drawRect(rect);
 172
 173     // mask
 174     p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
 175     p.setBrush(Qt::black);
 176     p.drawRoundRect(rect.adjusted(1, 2.5, -1, -1.4), rx, ry);
 177
 178     p.end();
 179     return pixmap;
 180 }
 181
 182 TileSet* OxygenScrollbar::vertical(int size, int width, int offset) const
 183 {
 184     int s = size/2;
 185     int length = s*22;
 186     double w = 12.0 * double(width)/double(s*2);
 187     double o = -12.0 * double(offset) / double(size);
 188     const int h = 6*22;
 189
 190     QPixmap pixmap(width, length);
 191     pixmap.fill(Qt::transparent);
 192
 193     QPainter p(&pixmap);
 194     p.setRenderHint(QPainter::Antialiasing);
 195     p.setPen(Qt::NoPen);
 196     p.setWindow(0, 0, int(w), h);
 197     QRectF rect(0, 0, w, h);
 198
 199     // mask; never draw outside this, hence mask() sets SourceAtop
 200     mask(p, rect);
 201
 202     // base
 203     p.setBrush(baseGradient(w, Qt::Vertical));
 204     p.drawRect(rect);
 205
 206     // shine
 207     p.setBrush(shineGradient(w, Qt::Vertical));
 208     p.drawRoundRect(QRectF(w- int(w*0.45)-0.5, 0, int(w*0.45), h), 2000.0 / w, 12);
 209     p.setClipping(false);
 210
 211     // shimmer
 212     p.setBrush(shimmerGradient(o, Qt::Vertical));
 213     p.drawRect(rect);
 214
 215     // dim edges
 216     p.setBrush(dimGradient(Qt::Vertical));
 217     p.drawRect(rect);
 218
 219     // highlight
 220     p.setBrush(alphaColor(highlight, 0.2));
 221     p.drawRoundRect(QRectF(w-3, 7, 1.5, h-14), 100, 5);
 222     p.drawRoundRect(QRectF(1.5, 7, 1.5, h-14), 100, 5);
 223
 224     // bevel
 225     p.setWindow(0, 0, width, length);
 226     p.drawPixmap(0, 0, bevel(width, length, w, h, int(1400.0/w), 9));
 227
 228     return new TileSet(pixmap, 1, s*3, width-2, s*16);
 229 }
 230
 231 TileSet* OxygenScrollbar::horizontal(int size, int width, int offset) const
 232 {
 233     int s = size/2;
 234     int length = s*22;
 235     double h = 12.0 * double(width)/double(s*2);
 236     double o = -12.0 * double(offset) / double(size);
 237     const int w = 6*22;
 238
 239     QPixmap pixmap(length, width);
 240     pixmap.fill(Qt::transparent);
 241
 242     QPainter p(&pixmap);
 243     p.setRenderHint(QPainter::Antialiasing);
 244     p.setPen(Qt::NoPen);
 245     p.setWindow(0, 0, w, int(h));
 246     QRectF rect(0, 0, w, h);
 247
 248     // mask; never draw outside this, hence mask() sets SourceAtop
 249     mask(p, rect);
 250
 251     // base
 252     p.setBrush(baseGradient(h, Qt::Horizontal));
 253     p.drawRect(rect);
 254
 255     // shine
 256     p.setBrush(shineGradient(h, Qt::Horizontal));
 257     p.drawRoundRect(QRectF(0, 0.5, w, int(h*0.45)), 12, 2000.0 / h);
 258     p.setClipping(false);
 259
 260     // shimmer
 261     p.setBrush(shimmerGradient(o, Qt::Horizontal));
 262     p.drawRect(rect);
 263
 264     // dim edges
 265     p.setBrush(dimGradient(Qt::Horizontal));
 266     p.drawRect(rect);
 267
 268     // bevel
 269     p.setWindow(0, 0, length, width);
 270     p.drawPixmap(0, 0, bevel(length, width, w, h, 9, int(1400.0/h)));
 271
 272     return new TileSet(pixmap, s*3, 1, s*16, width-2);
 273 }