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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 <qpainter.h>
#include <qpixmap.h>
#include <qlayout.h>
#include <qframe.h>
#include <qscrollbar.h>

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

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

ZLQtViewWidget::ZLQtViewWidgetInternal::ZLQtViewWidgetInternal(QWidget *parent, ZLQtViewWidget &holder) : QWidget(parent), myHolder(holder) {
      setBackgroundMode(NoBackground);
      setFocusPolicy(ClickFocus);
}

QScrollBar *ZLQtViewWidget::addScrollBar(QGridLayout *layout, Qt::Orientation orientation, int x, int y) {
      QScrollBar *scrollBar = new QScrollBar(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(nextLine()), this, SLOT(onVerticalSliderStepNext()));
            connect(scrollBar, SIGNAL(nextPage()), this, SLOT(onVerticalSliderPageNext()));
            connect(scrollBar, SIGNAL(prevLine()), this, SLOT(onVerticalSliderStepPrevious()));
            connect(scrollBar, SIGNAL(prevPage()), this, SLOT(onVerticalSliderPagePrevious()));
      } else {
            connect(scrollBar, SIGNAL(sliderMoved(int)), this, SLOT(onHorizontalSliderMoved(int)));
            connect(scrollBar, SIGNAL(nextLine()), this, SLOT(onHorizontalSliderStepNext()));
            connect(scrollBar, SIGNAL(nextPage()), this, SLOT(onHorizontalSliderPageNext()));
            connect(scrollBar, SIGNAL(prevLine()), this, SLOT(onHorizontalSliderStepPrevious()));
            connect(scrollBar, SIGNAL(prevPage()), this, SLOT(onHorizontalSliderPagePrevious()));
      }
      return scrollBar;
}

ZLQtViewWidget::ZLQtViewWidget(QWidget *parent, ZLApplication *application, const ZLQtViewWidgetPositionInfo &positionInfo) : ZLViewWidget((ZLView::Angle)application->AngleStateOption.value()), myApplication(application), myPositionInfo(positionInfo) {
      myFrame = new QFrame(parent);
      QGridLayout *layout = new QGridLayout(myFrame, 3, 3);
      layout->setRowStretch(0, 0);
      layout->setRowStretch(1, 1);
      layout->setRowStretch(2, 0);
      layout->setColStretch(0, 0);
      layout->setColStretch(1, 1);
      layout->setColStretch(2, 0);
      myQWidget = new ZLQtViewWidgetInternal(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;
}

const ZLQtViewWidgetPositionInfo &ZLQtViewWidget::positionInfo() const {
      return myPositionInfo;
}

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

void ZLQtViewWidget::ZLQtViewWidgetInternal::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(0, 1 - width(), context.pixmap());
                  break;
      }
}

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

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

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

int ZLQtViewWidget::ZLQtViewWidgetInternal::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::ZLQtViewWidgetInternal::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(false);
}

void ZLQtViewWidget::ZLQtViewWidgetInternal::resizeEvent(QResizeEvent*) {
      /*
      const ZLQtViewWidgetPositionInfo &info = myHolder.positionInfo();

      const int x = info.x();
      const int y = info.y();
      const QPoint position = pos();
      if ((x != position.x()) || (y != position.y())) {
            move(x, y);
      }

      const int width = info.width();
      const int height = info.height();
      if ((width != this->width()) || (height != this->height())) {
            resize(width, height);
      }
      */
}

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->isShown()) {
                        old->hide();
                        current->show();
                  }
            }
      } else {
            if (standard != myShowScrollBarAtBottom) {
                  myShowScrollBarAtBottom = standard;
                  QScrollBar *old = standard ? myTopScrollBar : myBottomScrollBar;
                  QScrollBar *current = standard ? myBottomScrollBar : myTopScrollBar;
                  if (old->isShown()) {
                        old->hide();
                        current->show();
                  }
            }
      }
}

void ZLQtViewWidget::setScrollbarParameters(ZLView::Direction direction, size_t full, size_t from, size_t to) {
      QScrollBar *bar =
            (direction == ZLView::VERTICAL) ?  verticalScrollBar() : horizontalScrollBar();
      bar->setMinValue(0);
      bar->setMaxValue(full + from - to);
      bar->setValue(from);
      bar->setPageStep(to - from);
}

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

void ZLQtViewWidget::onVerticalSliderMoved(int value) {
      QScrollBar *bar = verticalScrollBar();
      size_t maxValue = bar->maxValue();
      size_t pageStep = bar->pageStep();
      onScrollbarMoved(
            ZLView::VERTICAL,
            maxValue + pageStep,
            (size_t)value,
            (size_t)value + pageStep
      );
}

void ZLQtViewWidget::onVerticalSliderStepNext() {
      onScrollbarStep(ZLView::VERTICAL, 1);
}

void ZLQtViewWidget::onVerticalSliderStepPrevious() {
      onScrollbarStep(ZLView::VERTICAL, -1);
}

void ZLQtViewWidget::onVerticalSliderPageNext() {
      onScrollbarPageStep(ZLView::VERTICAL, 1);
}

void ZLQtViewWidget::onVerticalSliderPagePrevious() {
      onScrollbarPageStep(ZLView::VERTICAL, -1);
}

void ZLQtViewWidget::onHorizontalSliderMoved(int value) {
      QScrollBar *bar = horizontalScrollBar();
      size_t maxValue = bar->maxValue();
      size_t pageStep = bar->pageStep();
      onScrollbarMoved(
            ZLView::HORIZONTAL,
            maxValue + pageStep,
            (size_t)value,
            (size_t)value + pageStep
      );
}

void ZLQtViewWidget::onHorizontalSliderStepNext() {
      onScrollbarStep(ZLView::HORIZONTAL, 1);
}

void ZLQtViewWidget::onHorizontalSliderStepPrevious() {
      onScrollbarStep(ZLView::HORIZONTAL, -1);
}

void ZLQtViewWidget::onHorizontalSliderPageNext() {
      onScrollbarPageStep(ZLView::HORIZONTAL, 1);
}

void ZLQtViewWidget::onHorizontalSliderPagePrevious() {
      onScrollbarPageStep(ZLView::HORIZONTAL, -1);
}

QScrollBar *ZLQtViewWidget::verticalScrollBar() {
      return myShowScrollBarAtRight ? myRightScrollBar : myLeftScrollBar;
}

QScrollBar *ZLQtViewWidget::horizontalScrollBar() {
      return myShowScrollBarAtBottom ? myBottomScrollBar : myTopScrollBar;
}

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