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+/* _______ __ __ __ ______ __ __ _______ __ __
+ * / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
+ * / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
+ * / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
+ * / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
+ * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
+ * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
+ *
+ * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
+ *
+ *
+ * Per Larsson a.k.a finalman
+ * Olof Naessén a.k.a jansem/yakslem
+ *
+ * Visit: http://guichan.sourceforge.net
+ *
+ * License: (BSD)
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name of Guichan nor the names of its contributors may
+ * be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * For comments regarding functions please see the header file.
+ */
+
+#include "guichan/widgets/listbox.hpp"
+
+#include "guichan/basiccontainer.hpp"
+#include "guichan/font.hpp"
+#include "guichan/graphics.hpp"
+#include "guichan/key.hpp"
+#include "guichan/listmodel.hpp"
+#include "guichan/mouseinput.hpp"
+#include "guichan/selectionlistener.hpp"
+
+namespace gcn
+{
+ ListBox::ListBox()
+ : mSelected(-1),
+ mListModel(NULL),
+ mWrappingEnabled(false)
+ {
+ setWidth(100);
+ setFocusable(true);
+
+ addMouseListener(this);
+ addKeyListener(this);
+ }
+
+ ListBox::ListBox(ListModel *listModel)
+ : mSelected(-1),
+ mWrappingEnabled(false)
+ {
+ setWidth(100);
+ setListModel(listModel);
+ setFocusable(true);
+
+ addMouseListener(this);
+ addKeyListener(this);
+ }
+
+ void ListBox::draw(Graphics* graphics)
+ {
+ graphics->setColor(getBackgroundColor());
+ graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));
+
+ if (mListModel == NULL)
+ {
+ return;
+ }
+
+ graphics->setColor(getForegroundColor());
+ graphics->setFont(getFont());
+
+ // Check the current clip area so we don't draw unnecessary items
+ // that are not visible.
+ const ClipRectangle currentClipArea = graphics->getCurrentClipArea();
+ int rowHeight = getRowHeight();
+
+ // Calculate the number of rows to draw by checking the clip area.
+ // The addition of two makes covers a partial visible row at the top
+ // and a partial visible row at the bottom.
+ int numberOfRows = currentClipArea.height / rowHeight + 2;
+
+ if (numberOfRows > mListModel->getNumberOfElements())
+ {
+ numberOfRows = mListModel->getNumberOfElements();
+ }
+
+ // Calculate which row to start drawing. If the list box
+ // has a negative y coordinate value we should check if
+ // we should drop rows in the begining of the list as
+ // they might not be visible. A negative y value is very
+ // common if the list box for instance resides in a scroll
+ // area and the user has scrolled the list box downwards.
+ int startRow;
+ if (getY() < 0)
+ {
+ startRow = -1 * (getY() / rowHeight);
+ }
+ else
+ {
+ startRow = 0;
+ }
+
+ int i;
+ // The y coordinate where we start to draw the text is
+ // simply the y coordinate multiplied with the font height.
+ int y = rowHeight * startRow;
+ for (i = startRow; i < startRow + numberOfRows; ++i)
+ {
+ if (i == mSelected)
+ {
+ graphics->setColor(getSelectionColor());
+ graphics->fillRectangle(Rectangle(0, y, getWidth(), rowHeight));
+ graphics->setColor(getForegroundColor());
+ }
+
+ // If the row height is greater than the font height we
+ // draw the text with a center vertical alignment.
+ if (rowHeight > getFont()->getHeight())
+ {
+ graphics->drawText(mListModel->getElementAt(i), 1, y + rowHeight / 2 - getFont()->getHeight() / 2);
+ }
+ else
+ {
+ graphics->drawText(mListModel->getElementAt(i), 1, y);
+ }
+
+ y += rowHeight;
+ }
+ }
+
+ void ListBox::logic()
+ {
+ adjustSize();
+ }
+
+ int ListBox::getSelected() const
+ {
+ return mSelected;
+ }
+
+ void ListBox::setSelected(int selected)
+ {
+ if (mListModel == NULL)
+ {
+ mSelected = -1;
+ }
+ else
+ {
+ if (selected < 0)
+ {
+ mSelected = -1;
+ }
+ else if (selected >= mListModel->getNumberOfElements())
+ {
+ mSelected = mListModel->getNumberOfElements() - 1;
+ }
+ else
+ {
+ mSelected = selected;
+ }
+ }
+
+ Rectangle scroll;
+
+ if (mSelected < 0)
+ {
+ scroll.y = 0;
+ }
+ else
+ {
+ scroll.y = getRowHeight() * mSelected;
+ }
+
+ scroll.height = getRowHeight();
+ showPart(scroll);
+
+ distributeValueChangedEvent();
+ }
+
+ void ListBox::keyPressed(KeyEvent& keyEvent)
+ {
+ Key key = keyEvent.getKey();
+
+ if (key.getValue() == Key::ENTER || key.getValue() == Key::SPACE)
+ {
+ distributeActionEvent();
+ keyEvent.consume();
+ }
+ else if (key.getValue() == Key::UP)
+ {
+ setSelected(mSelected - 1);
+
+ if (mSelected == -1)
+ {
+ if (mWrappingEnabled)
+ {
+ setSelected(getListModel()->getNumberOfElements() - 1);
+ }
+ else
+ {
+ setSelected(0);
+ }
+ }
+
+ keyEvent.consume();
+ }
+ else if (key.getValue() == Key::DOWN)
+ {
+ if (mWrappingEnabled
+ && getSelected() == getListModel()->getNumberOfElements() - 1)
+ {
+ setSelected(0);
+ }
+ else
+ {
+ setSelected(getSelected() + 1);
+ }
+
+ keyEvent.consume();
+ }
+ else if (key.getValue() == Key::HOME)
+ {
+ setSelected(0);
+ keyEvent.consume();
+ }
+ else if (key.getValue() == Key::END)
+ {
+ setSelected(getListModel()->getNumberOfElements() - 1);
+ keyEvent.consume();
+ }
+ }
+
+ void ListBox::mousePressed(MouseEvent& mouseEvent)
+ {
+ if (mouseEvent.getButton() == MouseEvent::LEFT)
+ {
+ setSelected(mouseEvent.getY() / getRowHeight());
+ distributeActionEvent();
+ }
+ }
+
+ void ListBox::mouseWheelMovedUp(MouseEvent& mouseEvent)
+ {
+ if (isFocused())
+ {
+ if (getSelected() > 0 )
+ {
+ setSelected(getSelected() - 1);
+ }
+
+ mouseEvent.consume();
+ }
+ }
+
+ void ListBox::mouseWheelMovedDown(MouseEvent& mouseEvent)
+ {
+ if (isFocused())
+ {
+ setSelected(getSelected() + 1);
+
+ mouseEvent.consume();
+ }
+ }
+
+ void ListBox::mouseDragged(MouseEvent& mouseEvent)
+ {
+ mouseEvent.consume();
+ }
+
+ void ListBox::setListModel(ListModel *listModel)
+ {
+ mSelected = -1;
+ mListModel = listModel;
+ adjustSize();
+ }
+
+ ListModel* ListBox::getListModel()
+ {
+ return mListModel;
+ }
+
+ void ListBox::adjustSize()
+ {
+ if (mListModel != NULL)
+ {
+ setHeight(getRowHeight() * mListModel->getNumberOfElements());
+ }
+ }
+
+ bool ListBox::isWrappingEnabled() const
+ {
+ return mWrappingEnabled;
+ }
+
+ void ListBox::setWrappingEnabled(bool wrappingEnabled)
+ {
+ mWrappingEnabled = wrappingEnabled;
+ }
+
+ void ListBox::addSelectionListener(SelectionListener* selectionListener)
+ {
+ mSelectionListeners.push_back(selectionListener);
+ }
+
+ void ListBox::removeSelectionListener(SelectionListener* selectionListener)
+ {
+ mSelectionListeners.remove(selectionListener);
+ }
+
+ void ListBox::distributeValueChangedEvent()
+ {
+ SelectionListenerIterator iter;
+
+ for (iter = mSelectionListeners.begin(); iter != mSelectionListeners.end(); ++iter)
+ {
+ SelectionEvent event(this);
+ (*iter)->valueChanged(event);
+ }
+ }
+
+ unsigned int ListBox::getRowHeight() const
+ {
+ return getFont()->getHeight();
+ }
+}