Java tutorial
/* * Copyright (c) 2004-2011 Marco Maccaferri and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Marco Maccaferri - initial API and implementation */ package org.eclipsetrader.ui.internal.views; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.jface.viewers.CellLabelProvider; import org.eclipse.jface.viewers.ViewerCell; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableItem; import org.eclipsetrader.core.views.ISessionData; import org.eclipsetrader.core.views.IViewItem; public class ViewItemLabelProvider extends CellLabelProvider { public static final String K_FADE_LEVELS = "fade_levels"; private Color evenRowsColor = Display.getDefault().getSystemColor(SWT.COLOR_LIST_BACKGROUND); private Color oddRowsColor = Display.getDefault().getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW); private Color tickBackgroundColor = Display.getDefault().getSystemColor(SWT.COLOR_TITLE_BACKGROUND); private Color[] tickOddRowsFade = new Color[3]; private Color[] tickEvenRowsFade = new Color[3]; public ViewItemLabelProvider() { setTickBackground(Display.getDefault().getSystemColor(SWT.COLOR_TITLE_BACKGROUND).getRGB()); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.BaseLabelProvider#dispose() */ @Override public void dispose() { for (int i = 0; i < tickEvenRowsFade.length; i++) { tickEvenRowsFade[i].dispose(); } for (int i = 0; i < tickOddRowsFade.length; i++) { tickOddRowsFade[i].dispose(); } super.dispose(); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.BaseLabelProvider#isLabelProperty(java.lang.Object, java.lang.String) */ @Override public boolean isLabelProperty(Object element, String property) { return property != null; } /* (non-Javadoc) * @see org.eclipse.jface.viewers.CellLabelProvider#update(org.eclipse.jface.viewers.ViewerCell) */ @Override public void update(ViewerCell cell) { IViewItem element = (IViewItem) cell.getElement(); IAdaptable[] values = element.getValues(); if (values != null && cell.getColumnIndex() >= 0 && cell.getColumnIndex() < values.length) { if (values[cell.getColumnIndex()] != null) { String s = (String) values[cell.getColumnIndex()].getAdapter(String.class); if (s != null && !cell.getText().equals(s)) { cell.setText(s); } Image i = (Image) values[cell.getColumnIndex()].getAdapter(Image.class); if (i != cell.getImage()) { cell.setImage(i); } Color color = (Color) values[cell.getColumnIndex()].getAdapter(Color.class); if (color != null) { cell.setForeground(color); } } else { if (!cell.getText().equals("")) { cell.setText(""); } if (null != cell.getImage()) { cell.setImage(null); } cell.setForeground(null); } } else { if (!cell.getText().equals("")) { cell.setText(""); } if (null != cell.getImage()) { cell.setImage(null); } cell.setForeground(null); } updateBackground(cell); } protected void updateBackground(ViewerCell cell) { if (cell.getControl() instanceof Table && cell.getItem() instanceof TableItem) { int rowIndex = ((Table) cell.getControl()).indexOf((TableItem) cell.getItem()); cell.setBackground((rowIndex & 1) != 0 ? oddRowsColor : evenRowsColor); IViewItem element = (IViewItem) cell.getElement(); ISessionData data = (ISessionData) element.getAdapter(ISessionData.class); if (data != null) { int[] timers = (int[]) data.getData(K_FADE_LEVELS); int columnIndex = cell.getColumnIndex(); if (timers != null && columnIndex < timers.length) { if (timers[columnIndex] > 0) { switch (timers[columnIndex]) { case 4: cell.setBackground((rowIndex & 1) != 0 ? tickOddRowsFade[0] : tickEvenRowsFade[0]); break; case 3: cell.setBackground((rowIndex & 1) != 0 ? tickOddRowsFade[1] : tickEvenRowsFade[1]); break; case 2: cell.setBackground((rowIndex & 1) != 0 ? tickOddRowsFade[2] : tickEvenRowsFade[2]); break; case 1: break; default: cell.setBackground(tickBackgroundColor); break; } } } } } else { cell.setBackground(evenRowsColor); IViewItem element = (IViewItem) cell.getElement(); ISessionData data = (ISessionData) element.getAdapter(ISessionData.class); if (data != null) { int[] timers = (int[]) data.getData(K_FADE_LEVELS); int columnIndex = cell.getColumnIndex(); if (timers != null && columnIndex < timers.length) { if (timers[columnIndex] > 0) { switch (timers[columnIndex]) { case 4: cell.setBackground(tickEvenRowsFade[0]); break; case 3: cell.setBackground(tickEvenRowsFade[1]); break; case 2: cell.setBackground(tickEvenRowsFade[2]); break; case 1: break; default: cell.setBackground(tickBackgroundColor); break; } } } } } } public void setTickBackground(RGB color) { int steps = 100 / (tickEvenRowsFade.length + 1); for (int i = 0, ratio = 100 - steps; i < tickEvenRowsFade.length; i++, ratio -= steps) { RGB rgb = blend(tickBackgroundColor.getRGB(), evenRowsColor.getRGB(), ratio); tickEvenRowsFade[i] = new Color(Display.getDefault(), rgb); } steps = 100 / (tickOddRowsFade.length + 1); for (int i = 0, ratio = 100 - steps; i < tickOddRowsFade.length; i++, ratio -= steps) { RGB rgb = blend(tickBackgroundColor.getRGB(), oddRowsColor.getRGB(), ratio); tickOddRowsFade[i] = new Color(Display.getDefault(), rgb); } } private RGB blend(RGB c1, RGB c2, int ratio) { int r = blend(c1.red, c2.red, ratio); int g = blend(c1.green, c2.green, ratio); int b = blend(c1.blue, c2.blue, ratio); return new RGB(r, g, b); } private int blend(int v1, int v2, int ratio) { return (ratio * v1 + (100 - ratio) * v2) / 100; } }