src/qt/splashscreen.cpp

   1 // Copyright (c) 2011-2014 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "splashscreen.h"
   6
   7 #include "networkstyle.h"
   8
   9 #include "clientversion.h"
  10 #include "init.h"
  11 #include "util.h"
  12 #include "ui_interface.h"
  13 #include "version.h"
  14
  15 #ifdef ENABLE_WALLET
  16 #include "wallet/wallet.h"
  17 #endif
  18
  19 #include <QApplication>
  20 #include <QCloseEvent>
  21 #include <QDesktopWidget>
  22 #include <QPainter>
  23 #include <QRadialGradient>
  24
  25 SplashScreen::SplashScreen(Qt::WindowFlags f, const NetworkStyle *networkStyle) :
  26     QWidget(0, f), curAlignment(0)
  27 {
  28     // set reference point, paddings
  29     int paddingRight            = 50;
  30     int paddingTop              = 50;
  31     int titleVersionVSpace      = 17;
  32     int titleCopyrightVSpace    = 40;
  33
  34     float fontFactor            = 1.0;
  35     float devicePixelRatio      = 1.0;
  36 #if QT_VERSION > 0x050100
  37     devicePixelRatio = ((QGuiApplication*)QCoreApplication::instance())->devicePixelRatio();
  38 #endif
  39
  40     // define text to place
  41     QString titleText       = tr("Bitcoin Core");
  42     QString versionText     = QString("Version %1").arg(QString::fromStdString(FormatFullVersion()));
  43     QString copyrightText   = QChar(0xA9)+QString(" 2009-%1 ").arg(COPYRIGHT_YEAR) + QString(tr("The Bitcoin Core developers"));
  44     QString titleAddText    = networkStyle->getTitleAddText();
  45
  46     QString font            = QApplication::font().toString();
  47
  48     // create a bitmap according to device pixelratio
  49     QSize splashSize(480*devicePixelRatio,320*devicePixelRatio);
  50     pixmap = QPixmap(splashSize);
  51
  52 #if QT_VERSION > 0x050100
  53     // change to HiDPI if it makes sense
  54     pixmap.setDevicePixelRatio(devicePixelRatio);
  55 #endif
  56
  57     QPainter pixPaint(&pixmap);
  58     pixPaint.setPen(QColor(100,100,100));
  59
  60     // draw a slightly radial gradient
  61     QRadialGradient gradient(QPoint(0,0), splashSize.width()/devicePixelRatio);
  62     gradient.setColorAt(0, Qt::white);
  63     gradient.setColorAt(1, QColor(247,247,247));
  64     QRect rGradient(QPoint(0,0), splashSize);
  65     pixPaint.fillRect(rGradient, gradient);
  66
  67     // draw the bitcoin icon, expected size of PNG: 1024x1024
  68     QRect rectIcon(QPoint(-150,-122), QSize(430,430));
  69
  70     const QSize requiredSize(1024,1024);
  71     QPixmap icon(networkStyle->getAppIcon().pixmap(requiredSize));
  72
  73     pixPaint.drawPixmap(rectIcon, icon);
  74
  75     // check font size and drawing with
  76     pixPaint.setFont(QFont(font, 33*fontFactor));
  77     QFontMetrics fm = pixPaint.fontMetrics();
  78     int titleTextWidth  = fm.width(titleText);
  79     if(titleTextWidth > 160) {
  80         // strange font rendering, Arial probably not found
  81         fontFactor = 0.75;
  82     }
  83
  84     pixPaint.setFont(QFont(font, 33*fontFactor));
  85     fm = pixPaint.fontMetrics();
  86     titleTextWidth  = fm.width(titleText);
  87     pixPaint.drawText(pixmap.width()/devicePixelRatio-titleTextWidth-paddingRight,paddingTop,titleText);
  88
  89     pixPaint.setFont(QFont(font, 15*fontFactor));
  90
  91     // if the version string is to long, reduce size
  92     fm = pixPaint.fontMetrics();
  93     int versionTextWidth  = fm.width(versionText);
  94     if(versionTextWidth > titleTextWidth+paddingRight-10) {
  95         pixPaint.setFont(QFont(font, 10*fontFactor));
  96         titleVersionVSpace -= 5;
  97     }
  98     pixPaint.drawText(pixmap.width()/devicePixelRatio-titleTextWidth-paddingRight+2,paddingTop+titleVersionVSpace,versionText);
  99
 100     // draw copyright stuff
 101     pixPaint.setFont(QFont(font, 10*fontFactor));
 102     pixPaint.drawText(pixmap.width()/devicePixelRatio-titleTextWidth-paddingRight,paddingTop+titleCopyrightVSpace,copyrightText);
 103
 104     // draw additional text if special network
 105     if(!titleAddText.isEmpty()) {
 106         QFont boldFont = QFont(font, 10*fontFactor);
 107         boldFont.setWeight(QFont::Bold);
 108         pixPaint.setFont(boldFont);
 109         fm = pixPaint.fontMetrics();
 110         int titleAddTextWidth  = fm.width(titleAddText);
 111         pixPaint.drawText(pixmap.width()/devicePixelRatio-titleAddTextWidth-10,15,titleAddText);
 112     }
 113
 114     pixPaint.end();
 115
 116     // Set window title
 117     setWindowTitle(titleText + " " + titleAddText);
 118
 119     // Resize window and move to center of desktop, disallow resizing
 120     QRect r(QPoint(), QSize(pixmap.size().width()/devicePixelRatio,pixmap.size().height()/devicePixelRatio));
 121     resize(r.size());
 122     setFixedSize(r.size());
 123     move(QApplication::desktop()->screenGeometry().center() - r.center());
 124
 125     subscribeToCoreSignals();
 126 }
 127
 128 SplashScreen::~SplashScreen()
 129 {
 130     unsubscribeFromCoreSignals();
 131 }
 132
 133 void SplashScreen::slotFinish(QWidget *mainWin)
 134 {
 135     Q_UNUSED(mainWin);
 136     hide();
 137 }
 138
 139 static void InitMessage(SplashScreen *splash, const std::string &message)
 140 {
 141     QMetaObject::invokeMethod(splash, "showMessage",
 142         Qt::QueuedConnection,
 143         Q_ARG(QString, QString::fromStdString(message)),
 144         Q_ARG(int, Qt::AlignBottom|Qt::AlignHCenter),
 145         Q_ARG(QColor, QColor(55,55,55)));
 146 }
 147
 148 static void ShowProgress(SplashScreen *splash, const std::string &title, int nProgress)
 149 {
 150     InitMessage(splash, title + strprintf("%d", nProgress) + "%");
 151 }
 152
 153 #ifdef ENABLE_WALLET
 154 static void ConnectWallet(SplashScreen *splash, CWallet* wallet)
 155 {
 156     wallet->ShowProgress.connect(boost::bind(ShowProgress, splash, _1, _2));
 157 }
 158 #endif
 159
 160 void SplashScreen::subscribeToCoreSignals()
 161 {
 162     // Connect signals to client
 163     uiInterface.InitMessage.connect(boost::bind(InitMessage, this, _1));
 164     uiInterface.ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
 165 #ifdef ENABLE_WALLET
 166     uiInterface.LoadWallet.connect(boost::bind(ConnectWallet, this, _1));
 167 #endif
 168 }
 169
 170 void SplashScreen::unsubscribeFromCoreSignals()
 171 {
 172     // Disconnect signals from client
 173     uiInterface.InitMessage.disconnect(boost::bind(InitMessage, this, _1));
 174     uiInterface.ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
 175 #ifdef ENABLE_WALLET
 176     if(pwalletMain)
 177         pwalletMain->ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
 178 #endif
 179 }
 180
 181 void SplashScreen::showMessage(const QString &message, int alignment, const QColor &color)
 182 {
 183     curMessage = message;
 184     curAlignment = alignment;
 185     curColor = color;
 186     update();
 187 }
 188
 189 void SplashScreen::paintEvent(QPaintEvent *event)
 190 {
 191     QPainter painter(this);
 192     painter.drawPixmap(0, 0, pixmap);
 193     QRect r = rect().adjusted(5, 5, -5, -5);
 194     painter.setPen(curColor);
 195     painter.drawText(r, curAlignment, curMessage);
 196 }
 197
 198 void SplashScreen::closeEvent(QCloseEvent *event)
 199 {
 200     StartShutdown(); // allows an "emergency" shutdown during startup
 201     event->ignore();
 202 }