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ScrollBarWidget.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/gui/ScrollBarWidget.cpp,v 1.17 2004/02/28 12:57:53 fingolfin Exp $
 */

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


namespace GUI {

/*
 * TODO:
 * - Auto-repeat: if user clicks & holds on one of the arrows, then after a
 *   brief delay, it should start to contiously scroll
 * - Allow for a horizontal scrollbar, too?
 * - If there are less items than fit on one pages, no scrolling can be done
 *   and we thus should not highlight the arrows/slider.
 * - Allow the mouse wheel to scroll more than one line at a time
 */

#define UP_DOWN_BOX_HEIGHT    10

// Up arrow
static uint32 up_arrow[8] = {
      0x00000000,
      0x00000000,
      0x00001000,
      0x00001000,
      0x00011100,
      0x00011100,
      0x00110110,
      0x00100010,
};

// Down arrow
static uint32 down_arrow[8] = {
      0x00000000,
      0x00000000,
      0x00100010,
      0x00110110,
      0x00011100,
      0x00011100,
      0x00001000,
      0x00001000,
};

ScrollBarWidget::ScrollBarWidget(GuiObject *boss, int x, int y, int w, int h)
      : Widget (boss, x, y, w, h), CommandSender(boss) {
      _flags = 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;
      } else {
            _sliderHeight = _h - 2 * UP_DOWN_BOX_HEIGHT;
            _sliderPos = UP_DOWN_BOX_HEIGHT;
      }
}

void ScrollBarWidget::drawWidget(bool hilite) {
      NewGui *gui = &g_gui;
      int bottomY = _y + _h;
      bool isSinglePage = (_numEntries <= _entriesPerPage);

      gui->frameRect(_x, _y, _w, _h, gui->_shadowcolor);

      if (_draggingPart != kNoPart)
            _part = _draggingPart;

      // Up arrow
      gui->frameRect(_x, _y, _w, UP_DOWN_BOX_HEIGHT, gui->_color);
      gui->drawBitmap(up_arrow, _x, _y,
                              isSinglePage ? gui->_color :
                              (hilite && _part == kUpArrowPart) ? gui->_textcolorhi : gui->_textcolor);

      // Down arrow
      gui->frameRect(_x, bottomY - UP_DOWN_BOX_HEIGHT, _w, UP_DOWN_BOX_HEIGHT, gui->_color);
      gui->drawBitmap(down_arrow, _x, bottomY - UP_DOWN_BOX_HEIGHT,
                              isSinglePage ? gui->_color :
                              (hilite && _part == kDownArrowPart) ? gui->_textcolorhi : gui->_textcolor);

      // Slider
      if (!isSinglePage) {
            gui->fillRect(_x, _y + _sliderPos, _w, _sliderHeight,
                              (hilite && _part == kSliderPart) ? gui->_textcolorhi : gui->_textcolor);
            gui->frameRect(_x, _y + _sliderPos, _w, _sliderHeight, gui->_color);
            int y = _y + _sliderPos + _sliderHeight / 2;
            OverlayColor color = (hilite && _part == kSliderPart) ? gui->_color : gui->_shadowcolor;
            gui->hLine(_x + 2, y - 2, _x + _w - 3, color);
            gui->hLine(_x + 2, y, _x + _w - 3, color);
            gui->hLine(_x + 2, y + 2, _x + _w-3, color);
      }
}

} // End of namespace GUI

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