Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2010 Tasktop Technologies 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: * Tasktop Technologies - initial API and implementation * Frank Becker - improvements *******************************************************************************/ package org.eclipse.mylyn.commons.workbench; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.mylyn.commons.ui.compatibility.CommonThemes; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.graphics.Region; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Scrollable; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.Tree; import org.eclipse.ui.themes.IThemeManager; /** * @author Mik Kersten * @author Frank Becker * @since 3.7 */ public abstract class GradientDrawer { private final Listener CATEGORY_GRADIENT_DRAWER = new Listener() { public void handleEvent(Event event) { if (shouldApplyGradient(event)) { Scrollable scrollable = (Scrollable) event.widget; GC gc = event.gc; Rectangle area = scrollable.getClientArea(); Rectangle rect = event.getBounds(); /* Paint the selection beyond the end of last column */ expandRegion(event, scrollable, gc, area); /* Draw Gradient Rectangle */ Color oldForeground = gc.getForeground(); Color oldBackground = gc.getBackground(); gc.setForeground(categoryGradientEnd); gc.drawLine(0, rect.y, area.width, rect.y); gc.setForeground(categoryGradientStart); gc.setBackground(categoryGradientEnd); // gc.setForeground(categoryGradientStart); // gc.setBackground(categoryGradientEnd); // gc.setForeground(new Clr(Display.getCurrent(), 255, 0, 0)); gc.fillGradientRectangle(0, rect.y + 1, area.width, rect.height, true); /* Bottom Line */ // gc.setForeground(); gc.setForeground(categoryGradientEnd); gc.drawLine(0, rect.y + rect.height - 1, area.width, rect.y + rect.height - 1); gc.setForeground(oldForeground); gc.setBackground(oldBackground); /* Mark as Background being handled */ event.detail &= ~SWT.BACKGROUND; } } private void expandRegion(Event event, Scrollable scrollable, GC gc, Rectangle area) { int columnCount; if (scrollable instanceof Table) { columnCount = ((Table) scrollable).getColumnCount(); } else { columnCount = ((Tree) scrollable).getColumnCount(); } if (event.index == columnCount - 1 || columnCount == 0) { int width = area.x + area.width - event.x; if (width > 0) { Region region = new Region(); gc.getClipping(region); region.add(event.x, event.y, width, event.height); gc.setClipping(region); region.dispose(); } } } }; protected abstract boolean shouldApplyGradient(Event event); private final IPropertyChangeListener THEME_CHANGE_LISTENER = new IPropertyChangeListener() { public void propertyChange(PropertyChangeEvent event) { if (event.getProperty().equals(IThemeManager.CHANGE_CURRENT_THEME) || event.getProperty().equals(CommonThemes.COLOR_SCHEDULED_PAST) || event.getProperty().equals(CommonThemes.COLOR_COMPLETED_TODAY) || event.getProperty().equals(CommonThemes.COLOR_COMPLETED) || event.getProperty().equals(CommonThemes.COLOR_OVERDUE) || event.getProperty().equals(CommonThemes.COLOR_SCHEDULED_TODAY) || event.getProperty().equals(CommonThemes.COLOR_SCHEDULED_PAST) || event.getProperty().equals(CommonThemes.COLOR_SCHEDULED_TODAY) || event.getProperty().equals(CommonThemes.COLOR_SCHEDULED_THIS_WEEK) || event.getProperty().equals(CommonThemes.COLOR_TASK_ACTIVE) || CommonThemes.isCommonTheme(event.getProperty())) { configureGradientColors(); } } }; private boolean gradientListenerAdded = false; private final IThemeManager themeManager; private Color categoryGradientStart; private Color categoryGradientEnd; private final TreeViewer treeViewer; public GradientDrawer(IThemeManager theThemeManager, TreeViewer treeViewer) { this.themeManager = theThemeManager; this.treeViewer = treeViewer; treeViewer.getControl().addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { if (themeManager != null) { themeManager.removePropertyChangeListener(THEME_CHANGE_LISTENER); } } }); configureGradientColors(); themeManager.addPropertyChangeListener(THEME_CHANGE_LISTENER); } private void configureGradientColors() { categoryGradientStart = themeManager.getCurrentTheme().getColorRegistry() .get(CommonThemes.COLOR_CATEGORY_GRADIENT_START); categoryGradientEnd = themeManager.getCurrentTheme().getColorRegistry() .get(CommonThemes.COLOR_CATEGORY_GRADIENT_END); boolean customized = true; if (categoryGradientStart != null && categoryGradientStart.getRed() == 240 && categoryGradientStart.getGreen() == 240 && categoryGradientStart.getBlue() == 240 && categoryGradientEnd != null && categoryGradientEnd.getRed() == 220 && categoryGradientEnd.getGreen() == 220 && categoryGradientEnd.getBlue() == 220) { customized = false; } if (gradientListenerAdded == false && categoryGradientStart != null && !categoryGradientStart.equals(categoryGradientEnd)) { getViewer().getTree().addListener(SWT.EraseItem, CATEGORY_GRADIENT_DRAWER); gradientListenerAdded = true; if (!customized) { // Set parent-based colors Color parentBackground = getViewer().getTree().getParent().getBackground(); double GRADIENT_TOP;// = 1.05;// 1.02; double GRADIENT_BOTTOM;// = .995;// 1.035; // Constants to darken or lighten the default gradients if ("Windows 7".equals(System.getProperty("os.name"))) { //$NON-NLS-1$//$NON-NLS-2$ GRADIENT_TOP = 1.05; GRADIENT_BOTTOM = 1.09; } else { GRADIENT_TOP = 1.05; GRADIENT_BOTTOM = .995; } int red = Math.max(0, Math.min(255, (int) (parentBackground.getRed() * GRADIENT_TOP))); int green = Math.max(0, Math.min(255, (int) (parentBackground.getGreen() * GRADIENT_TOP))); int blue = Math.max(0, Math.min(255, (int) (parentBackground.getBlue() * GRADIENT_TOP))); try { categoryGradientStart = new Color(Display.getDefault(), red, green, blue); } catch (Exception e) { categoryGradientStart = getViewer().getTree().getParent().getBackground(); // StatusHandler.log(new Status(IStatus.ERROR, TasksUiPlugin.ID_PLUGIN, "Could not set color: " + red //$NON-NLS-1$ // + ", " + green + ", " + blue, e)); //$NON-NLS-1$ //$NON-NLS-2$ } red = Math.min(255, Math.max(0, (int) (parentBackground.getRed() / GRADIENT_BOTTOM))); green = Math.min(255, Math.max(0, (int) (parentBackground.getGreen() / GRADIENT_BOTTOM))); blue = Math.min(255, Math.max(0, (int) (parentBackground.getBlue() / GRADIENT_BOTTOM))); try { categoryGradientEnd = new Color(Display.getDefault(), red, green, blue); } catch (Exception e) { categoryGradientStart = getViewer().getTree().getParent().getBackground(); // StatusHandler.log(new Status(IStatus.ERROR, TasksUiPlugin.ID_PLUGIN, "Could not set color: " + red //$NON-NLS-1$ // + ", " + green + ", " + blue, e)); //$NON-NLS-1$ //$NON-NLS-2$ } } } else if (categoryGradientStart != null && categoryGradientStart.equals(categoryGradientEnd)) { getViewer().getTree().removeListener(SWT.EraseItem, CATEGORY_GRADIENT_DRAWER); gradientListenerAdded = false; } } public TreeViewer getViewer() { return treeViewer; } }