lyx_mirror/src/frontends/qt4/GuiWorkArea.C

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/**
* \file GuiWorkArea.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author John Levon
* \author Abdelrazak Younes
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "GuiWorkArea.h"
#include "GuiApplication.h"
#include "QLPainter.h"
#include "QLyXKeySym.h"
#include "qt_helpers.h"
#include "gettext.h"
#include "LyXView.h"
#include "BufferView.h"
#include "rowpainter.h"
#include "debug.h"
#include "funcrequest.h"
#include "LColor.h"
#include "version.h"
#include "lyxrc.h"
#include "support/filetools.h" // LibFileSearch
#include "support/os.h"
#include "support/convert.h"
#include "graphics/GraphicsImage.h"
#include "graphics/GraphicsLoader.h"
#include <QLayout>
#include <QMainWindow>
#include <QMimeData>
#include <QUrl>
#include <QDragEnterEvent>
#include <QPainter>
#include <QScrollBar>
#include <boost/bind.hpp>
#include <boost/current_function.hpp>
#ifdef Q_WS_WIN
int const CursorWidth = 2;
#else
int const CursorWidth = 1;
#endif
using std::endl;
using std::string;
namespace os = lyx::support::os;
namespace lyx {
using support::FileName;
/// return the LyX key state from Qt's
static key_modifier::state q_key_state(Qt::KeyboardModifiers state)
{
key_modifier::state k = key_modifier::none;
if (state & Qt::ControlModifier)
k |= key_modifier::ctrl;
if (state & Qt::ShiftModifier)
k |= key_modifier::shift;
if (state & Qt::AltModifier || state & Qt::MetaModifier)
k |= key_modifier::alt;
return k;
}
/// return the LyX mouse button state from Qt's
static mouse_button::state q_button_state(Qt::MouseButton button)
{
mouse_button::state b = mouse_button::none;
switch (button) {
case Qt::LeftButton:
b = mouse_button::button1;
break;
case Qt::MidButton:
b = mouse_button::button2;
break;
case Qt::RightButton:
b = mouse_button::button3;
break;
default:
break;
}
return b;
}
/// return the LyX mouse button state from Qt's
mouse_button::state q_motion_state(Qt::MouseButtons state)
{
mouse_button::state b = mouse_button::none;
if (state & Qt::LeftButton)
b |= mouse_button::button1;
if (state & Qt::MidButton)
b |= mouse_button::button2;
if (state & Qt::RightButton)
b |= mouse_button::button3;
return b;
}
namespace frontend {
class CursorWidget {
public:
CursorWidget() {}
void draw(QPainter & painter)
{
// FIXME: do something depending on the cursor shape.
if (show_ && rect_.isValid())
painter.fillRect(rect_, color_);
}
void update(int x, int y, int h, CursorShape shape)
{
color_ = guiApp->colorCache().get(LColor::cursor);
rect_ = QRect(x, y, CursorWidth, h);
shape_ = shape;
}
void show(bool set_show = true) { show_ = set_show; }
void hide() { show_ = false; }
QRect const & rect() { return rect_; }
private:
///
CursorShape shape_;
///
bool show_;
///
QColor color_;
///
QRect rect_;
};
// This is a 'heartbeat' generating synthetic mouse move events when the
// cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
SyntheticMouseEvent::SyntheticMouseEvent()
: timeout(200), restart_timeout(true),
x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
{}
GuiWorkArea::GuiWorkArea(int w, int h, int id, LyXView & lyx_view)
: WorkArea(id, lyx_view), need_resize_(false)
{
cursor_ = new frontend::CursorWidget();
cursor_->hide();
setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setAcceptDrops(true);
setMouseTracking(true);
setMinimumSize(100, 70);
viewport()->setAutoFillBackground(false);
// We don't need double-buffering nor SystemBackground on
// the viewport because we have our own backing pixmap.
viewport()->setAttribute(Qt::WA_NoSystemBackground);
setFocusPolicy(Qt::WheelFocus);
viewport()->setCursor(Qt::IBeamCursor);
resize(w, h);
synthetic_mouse_event_.timeout.timeout.connect(
boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
this));
// Initialize the vertical Scroll Bar
QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
this, SLOT(adjustViewWithScrollBar(int)));
// PageStep only depends on the viewport height.
verticalScrollBar()->setPageStep(viewport()->height());
lyxerr[Debug::GUI] << BOOST_CURRENT_FUNCTION
<< "\n Area width\t" << width()
<< "\n Area height\t" << height()
<< "\n viewport width\t" << viewport()->width()
<< "\n viewport height\t" << viewport()->height()
<< endl;
// Enables input methods for asian languages.
// Must be set when creating custom text editing widgets.
setAttribute(Qt::WA_InputMethodEnabled, true);
}
void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
{
if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
verticalScrollBar()->setTracking(false);
// do what cursor movement does (some grey)
h += height() / 4;
int scroll_max_ = std::max(0, h - height());
verticalScrollBar()->setRange(0, scroll_max_);
verticalScrollBar()->setSliderPosition(scroll_pos);
verticalScrollBar()->setSingleStep(scroll_line_step);
verticalScrollBar()->setValue(scroll_pos);
verticalScrollBar()->setTracking(true);
}
void GuiWorkArea::adjustViewWithScrollBar(int)
{
scrollBufferView(verticalScrollBar()->sliderPosition());
}
void GuiWorkArea::dragEnterEvent(QDragEnterEvent * event)
{
if (event->mimeData()->hasUrls())
event->accept();
/// \todo Ask lyx-devel is this is enough:
/// if (event->mimeData()->hasFormat("text/plain"))
/// event->acceptProposedAction();
}
void GuiWorkArea::dropEvent(QDropEvent* event)
{
QList<QUrl> files = event->mimeData()->urls();
if (files.isEmpty())
return;
lyxerr[Debug::GUI] << "GuiWorkArea::dropEvent: got URIs!" << endl;
for (int i = 0; i!=files.size(); ++i) {
string const file = os::internal_path(fromqstr(files.at(i).toLocalFile()));
if (!file.empty())
dispatch(FuncRequest(LFUN_FILE_OPEN, file));
}
}
void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
{
// No need to do anything if we didn't change views...
// if (theApp() == 0 || &lyx_view_ == theApp()->currentView())
// return;
theApp()->setCurrentView(lyx_view_);
// FIXME: it would be better to send a signal "newBuffer()"
// in BufferList that could be connected to the different tabbars.
lyx_view_.updateTab();
startBlinkingCursor();
}
void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
{
stopBlinkingCursor();
}
void GuiWorkArea::mousePressEvent(QMouseEvent * e)
{
if (dc_event_.active && dc_event_ == *e) {
dc_event_.active = false;
FuncRequest cmd(LFUN_MOUSE_TRIPLE,
dc_event_.x, dc_event_.y,
q_button_state(dc_event_.state));
dispatch(cmd);
return;
}
FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
q_button_state(e->button()));
dispatch(cmd);
}
void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
{
if (synthetic_mouse_event_.timeout.running())
synthetic_mouse_event_.timeout.stop();
FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
q_button_state(e->button()));
dispatch(cmd);
}
void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
{
FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
q_motion_state(e->buttons()));
// If we're above or below the work area...
if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
// Make sure only a synthetic event can cause a page scroll,
// so they come at a steady rate:
if (e->y() <= 20)
// _Force_ a scroll up:
cmd.y = -40;
else
cmd.y = viewport()->height();
// Store the event, to be handled when the timeout expires.
synthetic_mouse_event_.cmd = cmd;
if (synthetic_mouse_event_.timeout.running())
// Discard the event. Note that it _may_ be handled
// when the timeout expires if
// synthetic_mouse_event_.cmd has not been overwritten.
// Ie, when the timeout expires, we handle the
// most recent event but discard all others that
// occurred after the one used to start the timeout
// in the first place.
return;
else {
synthetic_mouse_event_.restart_timeout = true;
synthetic_mouse_event_.timeout.start();
// Fall through to handle this event...
}
} else if (synthetic_mouse_event_.timeout.running()) {
// Store the event, to be possibly handled when the timeout
// expires.
// Once the timeout has expired, normal control is returned
// to mouseMoveEvent (restart_timeout = false).
// This results in a much smoother 'feel' when moving the
// mouse back into the work area.
synthetic_mouse_event_.cmd = cmd;
synthetic_mouse_event_.restart_timeout = false;
return;
}
// Has anything changed on-screen since the last QMouseEvent
// was received?
double const scrollbar_value = verticalScrollBar()->value();
if (e->x() != synthetic_mouse_event_.x_old ||
e->y() != synthetic_mouse_event_.y_old ||
scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
// Yes it has. Store the params used to check this.
synthetic_mouse_event_.x_old = e->x();
synthetic_mouse_event_.y_old = e->y();
synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
// ... and dispatch the event to the LyX core.
dispatch(cmd);
}
}
void GuiWorkArea::wheelEvent(QWheelEvent * e)
{
// Wheel rotation by one notch results in a delta() of 120 (see
// documentation of QWheelEvent)
int const lines = qApp->wheelScrollLines() * e->delta() / 120;
verticalScrollBar()->setValue(verticalScrollBar()->value() -
lines * verticalScrollBar()->singleStep());
adjustViewWithScrollBar();
}
void GuiWorkArea::generateSyntheticMouseEvent()
{
// Set things off to generate the _next_ 'pseudo' event.
if (synthetic_mouse_event_.restart_timeout)
synthetic_mouse_event_.timeout.start();
// Has anything changed on-screen since the last timeout signal
// was received?
double const scrollbar_value = verticalScrollBar()->value();
if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
// Yes it has. Store the params used to check this.
synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
// ... and dispatch the event to the LyX core.
dispatch(synthetic_mouse_event_.cmd);
}
}
void GuiWorkArea::keyPressEvent(QKeyEvent * e)
{
lyxerr[Debug::KEY] << BOOST_CURRENT_FUNCTION
<< " count=" << e->count()
<< " text=" << fromqstr(e->text())
<< " isAutoRepeat=" << e->isAutoRepeat()
<< " key=" << e->key()
<< endl;
boost::shared_ptr<QLyXKeySym> sym(new QLyXKeySym);
sym->set(e);
processKeySym(sym, q_key_state(e->modifiers()));
}
void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * e)
{
dc_event_ = double_click(e);
if (!dc_event_.active)
return;
dc_event_.active = false;
FuncRequest cmd(LFUN_MOUSE_DOUBLE,
dc_event_.x, dc_event_.y,
q_button_state(dc_event_.state));
dispatch(cmd);
}
void GuiWorkArea::resizeEvent(QResizeEvent * ev)
{
verticalScrollBar()->setPageStep(viewport()->height());
QAbstractScrollArea::resizeEvent(ev);
need_resize_ = true;
}
void GuiWorkArea::update(int x, int y, int w, int h)
{
viewport()->repaint(x, y, w, h);
}
void GuiWorkArea::doGreyOut(QLPainter & pain)
{
setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
pain.fillRectangle(0, 0, width(), height(),
LColor::bottomarea);
//if (!lyxrc.show_banner)
// return;
lyxerr[Debug::GUI] << "show banner: " << lyxrc.show_banner << endl;
/// The text to be written on top of the pixmap
QString const text = lyx_version ? QString(lyx_version) : qt_("unknown version");
FileName const file = support::libFileSearch("images", "banner", "ppm");
if (file.empty())
return;
QPixmap pm(toqstr(file.absFilename()));
if (!pm) {
lyxerr << "could not load splash screen: '" << file << "'" << endl;
return;
}
QFont font;
// The font used to display the version info
font.setStyleHint(QFont::SansSerif);
font.setWeight(QFont::Bold);
font.setPointSize(convert<int>(lyxrc.font_sizes[LyXFont::SIZE_LARGE]));
int const w = pm.width();
int const h = pm.height();
int x = (width() - w) / 2;
int y = (height() - h) / 2;
pain.drawPixmap(x, y, pm);
x += 300;
y += 265;
pain.setPen(QColor(255, 255, 0));
pain.setFont(font);
pain.drawText(x, y, text);
}
void GuiWorkArea::paintEvent(QPaintEvent * ev)
{
QRect const rc = ev->rect();
/*
lyxerr[Debug::PAINTING] << "paintEvent begin: x: " << rc.x()
<< " y: " << rc.y()
<< " w: " << rc.width()
<< " h: " << rc.height() << endl;
*/
if (need_resize_) {
screen_ = QPixmap(viewport()->width(), viewport()->height());
resizeBufferView();
updateScreen();
need_resize_ = false;
}
QPainter pain(viewport());
pain.drawPixmap(rc, screen_, rc);
cursor_->draw(pain);
}
void GuiWorkArea::expose(int x, int y, int w, int h)
{
updateScreen();
update(x, y, w, h);
}
void GuiWorkArea::updateScreen()
{
QLPainter pain(&screen_);
if (greyed_out_) {
lyxerr[Debug::GUI] << "splash screen requested" << endl;
verticalScrollBar()->hide();
doGreyOut(pain);
return;
}
verticalScrollBar()->show();
paintText(*buffer_view_, pain);
}
void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
{
cursor_->update(x, y, h, shape);
cursor_->show();
viewport()->update(cursor_->rect());
}
void GuiWorkArea::removeCursor()
{
cursor_->hide();
//if (!qApp->focusWidget())
viewport()->update(cursor_->rect());
}
void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
{
QString const & text = e->commitString();
if (!text.isEmpty()) {
lyxerr[Debug::KEY] << BOOST_CURRENT_FUNCTION
<< " preeditString =" << fromqstr(e->preeditString())
<< " commitString =" << fromqstr(e->commitString())
<< endl;
int key = 0;
// needed to make math superscript work on some systems
// ideally, such special coding should not be necessary
if (text == "^")
key = Qt::Key_AsciiCircum;
// FIXME: Needs for investigation, this key is not really used,
// the ctor below just check if key is different from 0.
QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, text);
keyPressEvent(&ev);
}
e->accept();
}
} // namespace frontend
} // namespace lyx
#include "GuiWorkArea_moc.cpp"