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/* 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.
*
* $URL$
* $Id$
*/
#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;
ThemeEngine::ScrollbarState state = ThemeEngine::kScrollbarStateNo;
if (_numEntries <= _entriesPerPage) {
state = ThemeEngine::kScrollbarStateSinglePage;
} else if (_part == kUpArrowPart) {
state = ThemeEngine::kScrollbarStateUp;
} else if (_part == kDownArrowPart) {
state = ThemeEngine::kScrollbarStateDown;
} else if (_part == kSliderPart) {
state = ThemeEngine::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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