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ScrollBarWidget.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/gui/ScrollBarWidget.cpp $
 * $Id: ScrollBarWidget.cpp 30944 2008-02-23 22:50:18Z sev $
 */

#include "ScrollBarWidget.h"
#include "gui/dialog.h"
#include "gui/newgui.h"

namespace GUI {

#define UP_DOWN_BOX_HEIGHT    (_w+1)

ScrollBarWidget::ScrollBarWidget(GuiObject *boss, int x, int y, int w, int h)
      : Widget (boss, x, y, w, h), CommandSender(boss) {
      setFlags(WIDGET_ENABLED | WIDGET_TRACK_MOUSE | WIDGET_CLEARBG | WIDGET_WANT_TICKLE);
      _type = kScrollBarWidget;

      _part = kNoPart;
      _sliderHeight = 0;
      _sliderPos = 0;

      _draggingPart = kNoPart;
      _sliderDeltaMouseDownPos = 0;

      _numEntries = 0;
      _entriesPerPage = 0;
      _currentPos = 0;
}

void ScrollBarWidget::handleMouseDown(int x, int y, int button, int clickCount) {
      int old_pos = _currentPos;

      // Do nothing if there are less items than fit on one page
      if (_numEntries <= _entriesPerPage)
            return;

      if (y <= UP_DOWN_BOX_HEIGHT) {
            // Up arrow
            _currentPos--;
            _draggingPart = kUpArrowPart;
      } else if (y >= _h - UP_DOWN_BOX_HEIGHT) {
            // Down arrow
            _currentPos++;
            _draggingPart = kDownArrowPart;
      } else if (y < _sliderPos) {
            _currentPos -= _entriesPerPage;
      } else if (y >= _sliderPos + _sliderHeight) {
            _currentPos += _entriesPerPage;
      } else {
            _draggingPart = kSliderPart;
            _sliderDeltaMouseDownPos = y - _sliderPos;
      }

      // Make sure that _currentPos is still inside the bounds
      checkBounds(old_pos);
}

void ScrollBarWidget::handleMouseUp(int x, int y, int button, int clickCount) {
      _draggingPart = kNoPart;
}

void ScrollBarWidget::handleMouseWheel(int x, int y, int direction) {
      int old_pos = _currentPos;

      if (_numEntries < _entriesPerPage)
            return;

      if (direction < 0) {
            _currentPos--;
      } else {
            _currentPos++;
      }

      // Make sure that _currentPos is still inside the bounds
      checkBounds(old_pos);
}

void ScrollBarWidget::handleMouseMoved(int x, int y, int button) {
      // Do nothing if there are less items than fit on one page
      if (_numEntries <= _entriesPerPage)
            return;

      if (_draggingPart == kSliderPart) {
            int old_pos = _currentPos;
            _sliderPos = y - _sliderDeltaMouseDownPos;

            if (_sliderPos < UP_DOWN_BOX_HEIGHT)
                  _sliderPos = UP_DOWN_BOX_HEIGHT;

            if (_sliderPos > _h - UP_DOWN_BOX_HEIGHT - _sliderHeight)
                  _sliderPos = _h - UP_DOWN_BOX_HEIGHT - _sliderHeight;

            _currentPos =
                  (_sliderPos - UP_DOWN_BOX_HEIGHT) * (_numEntries - _entriesPerPage) / (_h - 2 * UP_DOWN_BOX_HEIGHT - _sliderHeight);
            checkBounds(old_pos);
      } else {
            int old_part = _part;

            if (y <= UP_DOWN_BOX_HEIGHT)  // Up arrow
                  _part = kUpArrowPart;
            else if (y >= _h - UP_DOWN_BOX_HEIGHT)    // Down arrow
                  _part = kDownArrowPart;
            else if (y < _sliderPos)
                  _part = kPageUpPart;
            else if (y >= _sliderPos + _sliderHeight)
                  _part = kPageDownPart;
            else
                  _part = kSliderPart;

            if (old_part != _part)
                  draw();
      }
}

void ScrollBarWidget::handleTickle() {
/*
      // FIXME/TODO - this code is supposed to allow for "click-repeat" (like key repeat),
      // i.e. if you click on one of the arrows and keep clicked, it will scroll
      // continuously. However, just like key repeat, this requires two delays:
      // First an "initial" delay that has to pass before repeating starts (otherwise
      // it is near to impossible to achieve single clicks). Secondly, a repeat delay
      // that determines how often per second a click is simulated.
      int old_pos = _currentPos;

      if (_draggingPart == kUpArrowPart)
            _currentPos--;
      else if (_draggingPart == kDownArrowPart)
            _currentPos++;

      // Make sure that _currentPos is still inside the bounds
      checkBounds(old_pos);
*/
}

void ScrollBarWidget::checkBounds(int old_pos) {
      if (_numEntries <= _entriesPerPage || _currentPos < 0)
            _currentPos = 0;
      else if (_currentPos > _numEntries - _entriesPerPage)
            _currentPos = _numEntries - _entriesPerPage;

      if (old_pos != _currentPos) {
            recalc();
            draw();
            sendCommand(kSetPositionCmd, _currentPos);
      }
}

void ScrollBarWidget::recalc() {
      if (_numEntries > _entriesPerPage) {
            _sliderHeight = (_h - 2 * UP_DOWN_BOX_HEIGHT) * _entriesPerPage / _numEntries;
            if (_sliderHeight < UP_DOWN_BOX_HEIGHT)
                  _sliderHeight = UP_DOWN_BOX_HEIGHT;

            _sliderPos =
                  UP_DOWN_BOX_HEIGHT + (_h - 2 * UP_DOWN_BOX_HEIGHT - _sliderHeight) * _currentPos / (_numEntries - _entriesPerPage);
            if (_sliderPos < 0)
                  _sliderPos = 0;
            clearFlags(WIDGET_INVISIBLE);
      } else {
            _sliderHeight = _h - 2 * UP_DOWN_BOX_HEIGHT;
            _sliderPos = UP_DOWN_BOX_HEIGHT;
            setFlags(WIDGET_INVISIBLE);
      }
}

void ScrollBarWidget::drawWidget() {
      if (_draggingPart != kNoPart)
            _part = _draggingPart;

      Theme::ScrollbarState state = Theme::kScrollbarStateNo;
      if (_numEntries <= _entriesPerPage) {
            state = Theme::kScrollbarStateSinglePage;
      } else if (_part == kUpArrowPart) {
            state = Theme::kScrollbarStateUp;
      } else if (_part == kDownArrowPart) {
            state = Theme::kScrollbarStateDown;
      } else if (_part == kSliderPart) {
            state = Theme::kScrollbarStateSlider;
      }

      g_gui.theme()->drawScrollbar(Common::Rect(_x, _y, _x+_w, _y+_h), _sliderPos, _sliderHeight, state, _state);
}

} // End of namespace GUI

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