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/* Copyright (C) 2013 Nikos Chantziaras.
*
* This file is part of the QTads program. This program is free software; you
* can redistribute it and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation; either version
* 2, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <QDebug>
#include <QPainter>
#include <QPaintEvent>
#include <QTimer>
#include "htmlfmt.h"
#include "htmltags.h"
#include "htmlinp.h"
#include "htmldisp.h"
#include "settings.h"
#include "syswingroup.h"
#include "syswin.h"
#include "dispwidgetinput.h"
DisplayWidgetInput::DisplayWidgetInput( CHtmlSysWinQt* parent, CHtmlFormatter* formatter )
: DisplayWidget(parent, formatter),
fCursorPos(0, 0),
fLastCursorPos(0, 0),
fCursorVisible(false),
fBlinkVisible(false),
fBlinkTimer(new QTimer(this))
{
connect(this->fBlinkTimer, SIGNAL(timeout()), this, SLOT(fBlinkCursor()));
this->resetCursorBlinking();
// Our initial height is the height of the current input font.
this->fHeight = QFontMetrics(qFrame->settings()->inputFont).height();
// We need to check whether the application lost focus.
connect(qApp, SIGNAL(focusChanged(QWidget*,QWidget*)), SLOT(fHandleFocusChange(QWidget*,QWidget*)));
}
void
DisplayWidgetInput::paintEvent( QPaintEvent* e )
{
//qDebug() << Q_FUNC_INFO << "called";
DisplayWidget::paintEvent(e);
QPainter painter(this);
if (this->fCursorVisible and this->fBlinkVisible) {
painter.drawLine(this->fCursorPos.x(), this->fCursorPos.y(), this->fCursorPos.x(),
this->fCursorPos.y() + this->fHeight);
}
}
void
DisplayWidgetInput::fBlinkCursor()
{
this->fBlinkVisible = not this->fBlinkVisible;
this->update(this->fCursorPos.x(), this->fCursorPos.y(), this->fCursorPos.x() + 1,
this->fCursorPos.y() + this->fHeight);
}
void
DisplayWidgetInput::fHandleFocusChange( QWidget* old, QWidget* now )
{
if (now == 0) {
// The application window lost focus. Disable cursor blinking.
this->fBlinkTimer->stop();
#ifdef Q_OS_MAC
// On the Mac, when applications lose focus the cursor must be disabled.
if (this->fBlinkVisible) {
this->fBlinkCursor();
}
#else
// On all other systems we assume the cursor must stay visible.
if (not this->fBlinkVisible) {
this->fBlinkCursor();
}
#endif
} else if (old == 0 and now != 0) {
// The application window gained focus. Reset cursor blinking.
this->resetCursorBlinking();
}
}
void
DisplayWidgetInput::updateCursorPos( CHtmlFormatter* formatter, CHtmlInputBuf* tadsBuffer, CHtmlTagTextInput* tag )
{
// Ignore the call if there's currently no active tag.
if (tag == 0) {
return;
}
// Reset the blink timer.
if (this->fBlinkTimer->isActive()) {
this->fBlinkTimer->start();
}
// Blink-out first to ensure the cursor won't stay visible at the previous
// position after we move it.
if (this->fBlinkVisible) {
this->fBlinkCursor();
}
CHtmlPoint cursorPos = formatter->get_text_pos(tag->get_text_ofs() + tadsBuffer->get_caret());
this->moveCursorPos(QPoint(cursorPos.x, cursorPos.y));
// Update the selection range in the formatter.
size_t start, end, caret;
unsigned long inp_txt_ofs = tag->get_text_ofs();
tadsBuffer->get_sel_range(&start, &end, &caret);
formatter->set_sel_range(start + inp_txt_ofs, end + inp_txt_ofs);
// Blink-in.
if (not this->fBlinkVisible) {
this->fBlinkCursor();
}
}
void
DisplayWidgetInput::resetCursorBlinking()
{
// Start the timer unless cursor blinking is disabled.
if (QApplication::cursorFlashTime() > 1) {
this->fBlinkTimer->start(QApplication::cursorFlashTime() / 2);
}
}
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