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ZLQtViewWidget.cpp

/*
 * Copyright (C) 2004-2009 Geometer Plus <contact@geometerplus.com>
 *
 * 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 of the License, 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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <algorithm>

#include <QtGui/QLayout>
#include <QtGui/QScrollBar>
#include <QtGui/QPainter>
#include <QtGui/QPixmap>
#include <QtGui/QMouseEvent>

#include <ZLibrary.h>
#include <ZLLanguageUtil.h>

#include "ZLQtViewWidget.h"
#include "ZLQtPaintContext.h"

class MyQScrollBar : public QScrollBar {

public:
      MyQScrollBar(Qt::Orientation orientation, QWidget *parent) : QScrollBar(orientation, parent) {
      }

private:
      void mouseMoveEvent(QMouseEvent *event) {
            if (orientation() == Qt::Vertical) {
                  const int y = event->y();
                  if ((y <= 0) || (y >= height())) {
                        return;
                  }
            } else {
                  const int x = event->x();
                  if ((x <= 0) || (x >= width())) {
                        return;
                  }
            }
            QScrollBar::mouseMoveEvent(event);
      }
};

ZLQtViewWidget::Widget::Widget(QWidget *parent, ZLQtViewWidget &holder) : QWidget(parent), myHolder(holder) {
      //setBackgroundMode(NoBackground);
}

QScrollBar *ZLQtViewWidget::addScrollBar(QGridLayout *layout, Qt::Orientation orientation, int x, int y) {
      QScrollBar *scrollBar = new MyQScrollBar(orientation, myFrame);
      layout->addWidget(scrollBar, x, y);
      scrollBar->hide();
      if (orientation == Qt::Vertical) {
            connect(scrollBar, SIGNAL(sliderMoved(int)), this, SLOT(onVerticalSliderMoved(int)));
            connect(scrollBar, SIGNAL(actionTriggered(int)), this, SLOT(onVerticalSliderClicked(int)));
      } else {
            connect(scrollBar, SIGNAL(sliderMoved(int)), this, SLOT(onHorizontalSliderMoved(int)));
            connect(scrollBar, SIGNAL(actionTriggered(int)), this, SLOT(onHorizontalSliderClicked(int)));
      }
      return scrollBar;
}

ZLQtViewWidget::ZLQtViewWidget(QWidget *parent, ZLApplication *application) : ZLViewWidget((ZLView::Angle)application->AngleStateOption.value()), myApplication(application) {
      myFrame = new QWidget(parent);
      QGridLayout *layout = new QGridLayout();
      layout->setMargin(0);
      layout->setSpacing(0);
      myFrame->setLayout(layout);
      myQWidget = new Widget(myFrame, *this);
      layout->addWidget(myQWidget, 1, 1);

      myRightScrollBar = addScrollBar(layout, Qt::Vertical, 1, 2);
      myLeftScrollBar = addScrollBar(layout, Qt::Vertical, 1, 0);
      myShowScrollBarAtRight = true;

      myBottomScrollBar = addScrollBar(layout, Qt::Horizontal, 2, 1);
      myTopScrollBar = addScrollBar(layout, Qt::Horizontal, 0, 1);
      myShowScrollBarAtBottom = true;
}

void ZLQtViewWidget::trackStylus(bool track) {
      myQWidget->setMouseTracking(track);
}

void ZLQtViewWidget::Widget::paintEvent(QPaintEvent*) {
      ZLQtPaintContext &context = (ZLQtPaintContext&)myHolder.view()->context();
      switch (myHolder.rotation()) {
            default:
                  context.setSize(width(), height());
                  break;
            case ZLView::DEGREES90:
            case ZLView::DEGREES270:
                  context.setSize(height(), width());
                  break;
      }
      myHolder.view()->paint();
      QPainter realPainter(this);
      switch (myHolder.rotation()) {
            default:
                  realPainter.drawPixmap(0, 0, context.pixmap());
                  break;
            case ZLView::DEGREES90:
                  realPainter.rotate(270);
                  realPainter.drawPixmap(1 - height(), -1, context.pixmap());
                  break;
            case ZLView::DEGREES180:
                  realPainter.rotate(180);
                  realPainter.drawPixmap(1 - width(), 1 - height(), context.pixmap());
                  break;
            case ZLView::DEGREES270:
                  realPainter.rotate(90);
                  realPainter.drawPixmap(-1, 1 - width(), context.pixmap());
                  break;
      }
}

void ZLQtViewWidget::Widget::mousePressEvent(QMouseEvent *event) {
      myHolder.view()->onStylusMove(x(event), y(event));
      myHolder.view()->onStylusPress(x(event), y(event));
}

void ZLQtViewWidget::Widget::mouseReleaseEvent(QMouseEvent *event) {
      myHolder.view()->onStylusRelease(x(event), y(event));
}

void ZLQtViewWidget::Widget::mouseMoveEvent(QMouseEvent *event) {
      switch (event->buttons()) {
            case Qt::LeftButton:
                  myHolder.view()->onStylusMovePressed(x(event), y(event));
                  break;
            case Qt::NoButton:
                  myHolder.view()->onStylusMove(x(event), y(event));
                  break;
            default:
                  break;
      }
}

int ZLQtViewWidget::Widget::x(const QMouseEvent *event) const {
      const int maxX = width() - 1;
      const int maxY = height() - 1;
      switch (myHolder.rotation()) {
            default:
                  return std::min(std::max(event->x(), 0), maxX);
            case ZLView::DEGREES90:
                  return maxY - std::min(std::max(event->y(), 0), maxY);
            case ZLView::DEGREES180:
                  return maxX - std::min(std::max(event->x(), 0), maxX);
            case ZLView::DEGREES270:
                  return std::min(std::max(event->y(), 0), maxY);
      }
}

int ZLQtViewWidget::Widget::y(const QMouseEvent *event) const {
      const int maxX = width() - 1;
      const int maxY = height() - 1;
      switch (myHolder.rotation()) {
            default:
                  return std::min(std::max(event->y(), 0), maxY);
            case ZLView::DEGREES90:
                  return std::min(std::max(event->x(), 0), maxX);
            case ZLView::DEGREES180:
                  return maxY - std::min(std::max(event->y(), 0), maxY);
            case ZLView::DEGREES270:
                  return maxX - std::min(std::max(event->x(), 0), maxX);
      }
}

void ZLQtViewWidget::repaint()      {
      myQWidget->repaint();
}

void ZLQtViewWidget::setScrollbarEnabled(ZLView::Direction direction, bool enabled) {
      if (direction == ZLView::VERTICAL) {
            myRightScrollBar->setShown(enabled && myShowScrollBarAtRight);
            myLeftScrollBar->setShown(enabled && !myShowScrollBarAtRight);
      } else {
            myBottomScrollBar->setShown(enabled && myShowScrollBarAtBottom);
            myTopScrollBar->setShown(enabled && !myShowScrollBarAtBottom);
      }
}

void ZLQtViewWidget::setScrollbarPlacement(ZLView::Direction direction, bool standard) {
      if ((rotation() == ZLView::DEGREES90) || (rotation() == ZLView::DEGREES270)) {
            if (ZLLanguageUtil::isRTLLanguage(ZLibrary::Language())) {
                  standard = !standard;
            }
      }
      if (direction == ZLView::VERTICAL) {
            if (standard != myShowScrollBarAtRight) {
                  myShowScrollBarAtRight = standard;
                  QScrollBar *old = standard ? myLeftScrollBar : myRightScrollBar;
                  QScrollBar *current = standard ? myRightScrollBar : myLeftScrollBar;
                  if (old->isVisible()) {
                        old->hide();
                        current->show();
                  }
            }
      } else {
            if (standard != myShowScrollBarAtBottom) {
                  myShowScrollBarAtBottom = standard;
                  QScrollBar *old = standard ? myTopScrollBar : myBottomScrollBar;
                  QScrollBar *current = standard ? myBottomScrollBar : myTopScrollBar;
                  if (old->isVisible()) {
                        old->hide();
                        current->show();
                  }
            }
      }
}

void ZLQtViewWidget::setScrollbarParameters(ZLView::Direction direction, size_t full, size_t from, size_t to) {
      QScrollBar *bar =
            (direction == ZLView::VERTICAL) ?
                  (myShowScrollBarAtRight ? myRightScrollBar : myLeftScrollBar) :
                  (myShowScrollBarAtBottom ? myBottomScrollBar : myTopScrollBar);
      bar->setMinimum(0);
      bar->setMaximum(full + from - to);
      bar->setValue(from);
      bar->setPageStep(to - from);
}

void ZLQtViewWidget::onVerticalSliderMoved(int value) {
      QScrollBar *bar =
            myShowScrollBarAtRight ? myRightScrollBar : myLeftScrollBar;
      int maxValue = bar->maximum();
      int pageStep = bar->pageStep();
      value = std::max(std::min(value, maxValue), 0);
      onScrollbarMoved(
            ZLView::VERTICAL,
            maxValue + pageStep,
            value,
            value + pageStep
      );
}

void ZLQtViewWidget::onHorizontalSliderMoved(int value) {
      QScrollBar *bar =
            myShowScrollBarAtBottom ? myBottomScrollBar : myTopScrollBar;
      int maxValue = bar->maximum();
      int pageStep = bar->pageStep();
      value = std::max(std::min(value, maxValue), 0);
      onScrollbarMoved(
            ZLView::HORIZONTAL,
            maxValue + pageStep,
            value,
            value + pageStep
      );
}

void ZLQtViewWidget::onVerticalSliderClicked(int value) {
      switch (value) {
            case QScrollBar::SliderSingleStepAdd:
                  onScrollbarStep(ZLView::VERTICAL, 1);
                  break;
            case QScrollBar::SliderSingleStepSub:
                  onScrollbarStep(ZLView::VERTICAL, -1);
                  break;
            case QScrollBar::SliderPageStepAdd:
                  onScrollbarPageStep(ZLView::VERTICAL, 1);
                  break;
            case QScrollBar::SliderPageStepSub:
                  onScrollbarPageStep(ZLView::VERTICAL, -1);
                  break;
      }
}

void ZLQtViewWidget::onHorizontalSliderClicked(int value) {
      switch (value) {
            case QScrollBar::SliderSingleStepAdd:
                  onScrollbarStep(ZLView::HORIZONTAL, 1);
                  break;
            case QScrollBar::SliderSingleStepSub:
                  onScrollbarStep(ZLView::HORIZONTAL, -1);
                  break;
            case QScrollBar::SliderPageStepAdd:
                  onScrollbarPageStep(ZLView::HORIZONTAL, 1);
                  break;
            case QScrollBar::SliderPageStepSub:
                  onScrollbarPageStep(ZLView::HORIZONTAL, -1);
                  break;
      }
}

QWidget *ZLQtViewWidget::widget() {
      return myFrame;
}

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