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Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
#include <qpaintevent></qpaintevent>
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#include <qdesktopwidget></qdesktopwidget>
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#include <qapplication></qapplication>
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#include <qmetaobject></qmetaobject>
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#include <qcursor></qcursor>
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#include <qpainter></qpainter>
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#include "toonzqt/screenboard.h"
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using namespace DVGui;
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#include <qpalette></qpalette>
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#include <qscreen></qscreen>
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//***********************************************************************************
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//    Local namespace
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//***********************************************************************************
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namespace {
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class MouseTrackerDrawing final : public ScreenBoard::Drawing {
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public:
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  bool acceptScreenEvents(const QRect &rect) const override {
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    return rect.contains(QCursor::pos());
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  }
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  void paintEvent(QWidget *widget, QPaintEvent *pe) override {
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    // Seems that mouse masking is on by default on the drawn regions, when
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    // using WA_TranslucentBackground (which is weird). I think it's the Qt 2
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    // autoMask feature that disappeared from Qt 3 on - now it must be managed
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    // internally.
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    // So, we have to fill the entire screen region with the most invisible
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    // color possible...
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#ifdef MACOSX
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#define MIN_ALPHA                                                              \
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  13  // Again, very weird. 13 is the minimal alpha that gets converted to
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      // 'mask-opaque' on MAC...
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#else
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#define MIN_ALPHA 1  // ... whereas 1 is sufficient on Windows. Argh!
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#endif
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    QPainter painter(widget);
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    painter.fillRect(0, 0, widget->width(), widget->height(),
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                     QColor(0, 0, 0, MIN_ALPHA));
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  }
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} tracker;
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}  // namespace
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//***********************************************************************************
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//    ScreenWidget implementation
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//***********************************************************************************
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class ScreenBoard::ScreenWidget final : public QWidget {
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  QList<screenboard::drawing *=""></screenboard::drawing>
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      m_drawings;        //!< Drawings intersecting the screen
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  bool m_mouseOnScreen;  //!< Whether the mouse is inside this screen
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public:
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  ScreenWidget(QWidget *parent = 0, bool grabbing = false)
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      : QWidget(
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            parent,
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            Qt::Tool |  // Tool does not force focus changes upon shows
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                Qt::FramelessWindowHint |  // No decorations
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                Qt::WindowStaysOnTopHint)  // Must be above all other windows
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  {
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    setAttribute(Qt::WA_TransparentForMouseEvents,
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                 !grabbing);                     // Receives mouse events?
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    setAttribute(Qt::WA_TranslucentBackground);  // Transparent widget
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    setFocusPolicy(Qt::NoFocus);
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    setMouseTracking(true);  // When receiving mouse events
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  }
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  const QList<drawing *=""> &drawings() const { return m_drawings; }</drawing>
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  QList<drawing *=""> &drawings() { return m_drawings; }</drawing>
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  bool mouseOnScreen() const { return m_mouseOnScreen; }
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protected:
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  bool event(QEvent *e) override {
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    int i, size = m_drawings.size();
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    if (e->type() == QEvent::Paint) {
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      // Invoke paint events in reversed sorting order
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      for (i = size - 1; i >= 0; --i)
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        m_drawings[i]->paintEvent(this, static_cast<qpaintevent *="">(e));</qpaintevent>
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    }
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    // Invoke other events in straight sorting order
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    for (i = 0; i < size; ++i) m_drawings[i]->event(this, e);
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    return QWidget::event(e);
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  }
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  void leaveEvent(QEvent *e) override {
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    m_mouseOnScreen = false;
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    ScreenBoard *screenBoard = ScreenBoard::instance();
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    if (screenBoard->m_grabbing) screenBoard->ensureMouseOnAScreen();
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  }
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  void enterEvent(QEvent *e) override {
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    m_mouseOnScreen                           = true;
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    ScreenBoard::instance()->m_mouseOnAScreen = true;
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  }
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};
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//***********************************************************************************
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//    ScreenBoard implementation
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//***********************************************************************************
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ScreenBoard::ScreenBoard() : m_grabbing(false) {}
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//------------------------------------------------------------------------------
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ScreenBoard *ScreenBoard::instance() {
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  static ScreenBoard theInstance;
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  return &theInstance;
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}
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//------------------------------------------------------------------------------
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/*!
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  Makes the ScreenBoard catch all mouse events (effectively preventing other
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  windows or applications
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  to get them), and delivers them to drawings. An appropriate cursor should be
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  specified to inform the
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  user that tout-court mouse grabbing takes place.
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*/
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void ScreenBoard::grabMouse(const QCursor &cursor) {
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  m_grabbing = true;
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  m_cursor   = cursor;
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  // Place a mouse-tracking dummy drawing among drawings
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  m_drawings.push_back(&::tracker);
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  // Make all screen widgets react to mouse events, and show them
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  int i, size = m_screenWidgets.size();
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  for (i = 0; i < size; ++i) {
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    QWidget *screenWidget = m_screenWidgets[i];
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    if (screenWidget) {
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      screenWidget->setAttribute(Qt::WA_TransparentForMouseEvents, false);
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      screenWidget->setCursor(m_cursor);
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    }
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  }
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}
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//------------------------------------------------------------------------------
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/*!
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  Restores the ScreenBoard to ignore mouse events (the default behaviour) after
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  a
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  call to grabMouse().
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*/
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void ScreenBoard::releaseMouse() {
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  // Restore screen widgets to ignore mouse events
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  int i, size = m_screenWidgets.size();
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  for (i = 0; i < size; ++i) {
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    QWidget *screenWidget = m_screenWidgets[i];
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    if (screenWidget) {
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      screenWidget->setAttribute(Qt::WA_TransparentForMouseEvents, true);
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      screenWidget->unsetCursor();
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    }
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  }
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  // Remove the mouse-tracking drawing
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  m_drawings.removeAt(m_drawings.indexOf(&::tracker));
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  m_cursor   = QCursor();
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  m_grabbing = false;
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}
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//------------------------------------------------------------------------------
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// Refresh the screen widgets pool, depending on stored drawings
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void ScreenBoard::reallocScreenWidgets() {
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  QDesktopWidget *desktop = QApplication::desktop();
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  int i;
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  int screensCount = QGuiApplication::screens().count();
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  // Delete exceeding screens and resize to screensCount
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  for (i = screensCount; i < m_screenWidgets.size(); ++i) {
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    m_screenWidgets[i]->hide();
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    m_screenWidgets[i]->deleteLater();  // Ensures no event about it is pending.
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    // Note that updates may be invoked in event handlers.
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  }
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  m_screenWidgets.resize(screensCount);
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  // Re-initialize the screen widgets list
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  for (i = 0; i < screensCount; ++i) {
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    ScreenWidget *screenWidget = m_screenWidgets[i];
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    if (screenWidget) screenWidget->drawings().clear();
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  }
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  // Turn on a ScreenWidget for each screen crossed by any drawing
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  int j, drawingsCount = m_drawings.size();
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  for (i = 0; i < screensCount; ++i) {
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    ScreenWidget *screenWidget = m_screenWidgets[i];
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    const QRect &screenGeom    = QGuiApplication::screens().at(i)->geometry();
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    for (j = 0; j < drawingsCount; ++j) {
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      Drawing *drawing = m_drawings[j];
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      if (drawing->acceptScreenEvents(screenGeom)) {
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        // Allocate the associated screen widget if necessary
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        if (!screenWidget) {
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          m_screenWidgets[i] = screenWidget = new ScreenWidget(0, m_grabbing);
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          if (m_grabbing) screenWidget->setCursor(m_cursor);
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          screenWidget->setGeometry(screenGeom);
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          screenWidget->show();
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        }
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        // Add the drawing to the widget
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        screenWidget->drawings().push_back(drawing);
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      }
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    }
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  }
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  // Remove screens without drawings
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  for (i = 0; i < screensCount; ++i) {
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    ScreenWidget *screenWidget = m_screenWidgets[i];
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    if (screenWidget && screenWidget->drawings().empty()) {
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      screenWidget->hide();
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      screenWidget->deleteLater();
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      m_screenWidgets[i] = 0;
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    }
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  }
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}
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//------------------------------------------------------------------------------
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/*!
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  This function must be called whenever a drawing needs to be refreshed.
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  It has 2 consequences:
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    \li The pool of invisible screen widgets that are used to catch Qt events
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        is refreshed to satisfy the drawings requirements. Screen widgets whose
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        events are not needed are released from the pool.
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    \li All screen widgets are updated, propagating paintEvents to their
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  drawings.
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  Observe that this function awaits return to the main event loop before being
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  processed.
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  This ensures that update calls are processed outside event handlers, and
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  multiple
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  calls from different drawings gets coalesced into one.
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*/
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void ScreenBoard::update() {
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  m_updated = false;
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  QMetaObject::invokeMethod(this, "doUpdate", Qt::QueuedConnection);
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}
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//------------------------------------------------------------------------------
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void ScreenBoard::doUpdate() {
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  if (m_updated)  // Weak updates coalescence. It helps.
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    return;
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  m_updated = true;
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  reallocScreenWidgets();
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  // Update all screenWidgets
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  int i, size = m_screenWidgets.size();
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  for (i = 0; i < size; ++i)
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    if (m_screenWidgets[i]) m_screenWidgets[i]->update();
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}
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//------------------------------------------------------------------------------
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void ScreenBoard::ensureMouseOnAScreen() {
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  // Find out if the mouse is on a screen
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  m_mouseOnAScreen = false;
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  int i, size = m_screenWidgets.size();
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  for (i = 0; i < size; ++i) {
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    ScreenWidget *screenWidget = m_screenWidgets[i];
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    if (screenWidget) m_mouseOnAScreen |= screenWidget->mouseOnScreen();
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  }
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  if (!m_mouseOnAScreen)
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    // Ensure that there is a screen under the mouse cursor.
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    // We need a slot invocation, since this method could be called in an event
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    // handler.
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    QMetaObject::invokeMethod(this, "trackCursor", Qt::QueuedConnection);
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}
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//------------------------------------------------------------------------------
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void ScreenBoard::trackCursor() {
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  while (!m_mouseOnAScreen) {
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    update();  // Refresh screens pool
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    QCoreApplication::processEvents(
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        QEventLoop::WaitForMoreEvents);  // Process events (-> enterEv.)
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  }
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}