Initial commit

gui/widgets/scrollbar.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/rect.h"
+#include "common/system.h"
+#include "common/timer.h"
+#include "gui/widgets/scrollbar.h"
+#include "gui/gui-manager.h"
+#include "gui/ThemeEngine.h"
+#include "gui/widgets/scrollcontainer.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;
+	_singleStep = 1;
+
+	_repeatTimer = 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 -= _singleStep;
+		_repeatTimer = g_system->getMillis() + kRepeatInitialDelay;
+		_draggingPart = kUpArrowPart;
+	} else if (y >= _h - UP_DOWN_BOX_HEIGHT) {
+		// Down arrow
+		_currentPos += _singleStep;
+		_repeatTimer = g_system->getMillis() + kRepeatInitialDelay;
+		_draggingPart = kDownArrowPart;
+	} 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;
+	_repeatTimer = 0;
+}
+
+void ScrollBarWidget::handleMouseWheel(int x, int y, int direction) {
+	int old_pos = _currentPos;
+
+	if (_numEntries < _entriesPerPage)
+		return;
+
+	if (direction < 0) {
+		_currentPos -= _singleStep;
+	} else {
+		_currentPos += _singleStep;
+	}
+
+	// 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)
+			markAsDirty();
+	}
+}
+
+void ScrollBarWidget::handleTickle() {
+	if (_repeatTimer) {
+		const uint32 curTime = g_system->getMillis();
+		if (curTime >= _repeatTimer) {
+			const int old_pos = _currentPos;
+
+			if (_part == kUpArrowPart)
+				_currentPos -= 3 * _singleStep;
+			else if (_part == kDownArrowPart)
+				_currentPos += 3 * _singleStep;
+
+			checkBounds(old_pos);
+
+			_repeatTimer = curTime + kRepeatDelay;
+		}
+	}
+}
+
+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();
+		markAsDirty();
+		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);
+}
+
+} // End of namespace GUI