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Diffstat (limited to 'gui/widgets/scrollbar.cpp')
-rw-r--r-- | gui/widgets/scrollbar.cpp | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/gui/widgets/scrollbar.cpp b/gui/widgets/scrollbar.cpp new file mode 100644 index 0000000000..2671fc7d61 --- /dev/null +++ b/gui/widgets/scrollbar.cpp @@ -0,0 +1,233 @@ +/* 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 "gui/widgets/scrollbar.h" +#include "gui/dialog.h" +#include "gui/GuiManager.h" + +#include "common/timer.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; +} + +static void upArrowRepeater(void *ref) { + ScrollBarWidget *sb = (ScrollBarWidget *)ref; + int old_pos = sb->_currentPos; + + sb->_currentPos -= 3; + sb->checkBounds(old_pos); + + g_system->getTimerManager()->removeTimerProc(&upArrowRepeater); + g_system->getTimerManager()->installTimerProc(&upArrowRepeater, 1000000/10, ref); +} + +static void downArrowRepeater(void *ref) { + ScrollBarWidget *sb = (ScrollBarWidget *)ref; + int old_pos = sb->_currentPos; + + sb->_currentPos += 3; + sb->checkBounds(old_pos); + + g_system->getTimerManager()->removeTimerProc(&downArrowRepeater); + g_system->getTimerManager()->installTimerProc(&downArrowRepeater, 1000000/10, ref); +} + +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; + g_system->getTimerManager()->installTimerProc(&upArrowRepeater, 1000000/2, this); + } else if (y >= _h - UP_DOWN_BOX_HEIGHT) { + // Down arrow + _currentPos++; + _draggingPart = kDownArrowPart; + g_system->getTimerManager()->installTimerProc(&downArrowRepeater, 1000000/2, this); + } else if (y < _sliderPos) { + _currentPos -= _entriesPerPage - 1; + } else if (y >= _sliderPos + _sliderHeight) { + _currentPos += _entriesPerPage - 1; + } 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; + + g_system->getTimerManager()->removeTimerProc(&upArrowRepeater); + g_system->getTimerManager()->removeTimerProc(&downArrowRepeater); +} + +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; + setVisible(true); + } else { + _sliderHeight = _h - 2 * UP_DOWN_BOX_HEIGHT; + _sliderPos = UP_DOWN_BOX_HEIGHT; + setVisible(false); + } +} + +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 |