Java tutorial
/* * Copyright (c) 2011, the Dart project authors. * * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.eclipse.org/legal/epl-v10.html * * Unless required by applicable law or agreed to in writing, software distributed under the License * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express * or implied. See the License for the specific language governing permissions and limitations under * the License. */ package com.google.dart.tools.ui; import org.eclipse.core.runtime.Assert; import org.eclipse.jface.resource.CompositeImageDescriptor; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.Point; /** * A {@link DartElementImageDescriptor} consists of a base image and several adornments. The * adornments are computed according to the flags either passed during creation or set via the * method {@link #setAdornments(int)}. * <p> * This class may be instantiated; it is not intended to be subclassed. * </p> * * Provisional API: This class/interface is part of an interim API that is still under development * and expected to change significantly before reaching stability. It is being made available at * this early stage to solicit feedback from pioneering adopters on the understanding that any code * that uses this API will almost certainly be broken (repeatedly) as the API evolves. */ public class DartElementImageDescriptor extends CompositeImageDescriptor { /** Flag to render the abstract adornment. */ public final static int ABSTRACT = 0x001; /** Flag to render the final adornment. */ public final static int FINAL = 0x002; /** Flag to render the synchronized adornment. */ public final static int SYNCHRONIZED = 0x004; /** Flag to render the static adornment. */ public final static int STATIC = 0x008; /** Flag to render the runnable adornment. */ public final static int RUNNABLE = 0x010; /** Flag to render the warning adornment. */ public final static int WARNING = 0x020; /** Flag to render the error adornment. */ public final static int ERROR = 0x040; /** Flag to render the 'override' adornment. */ public final static int OVERRIDES = 0x080; /** Flag to render the 'implements' adornment. */ public final static int IMPLEMENTS = 0x100; /** Flag to render the 'constructor' adornment. */ public final static int CONSTRUCTOR = 0x200; /** * Flag to render the 'volatile' adornment. */ public final static int VOLATILE = 0x800; /** * Flag to render the 'transient' adornment. */ public final static int TRANSIENT = 0x1000; /** * Flag to render the 'const' adornment. */ public final static int CONST = 0x2000; /** * Flag to render the 'setter' adornment */ public final static int SETTER = 0x4000; /** * Flag to render the 'getter' adornment */ public final static int GETTER = 0x10000; /** * Flag to render the 'linked' adornment */ public final static int LINKED = 0x20000; private ImageDescriptor fBaseImage; private int fFlags; private Point fSize; /** * Creates a new DartElementImageDescriptor. * * @param baseImage an image descriptor used as the base image * @param flags flags indicating which adornments are to be rendered. See * {@link #setAdornments(int)} for valid values. * @param size the size of the resulting image */ public DartElementImageDescriptor(ImageDescriptor baseImage, int flags, Point size) { fBaseImage = baseImage; Assert.isNotNull(fBaseImage); fFlags = flags; Assert.isTrue(fFlags >= 0); fSize = size; Assert.isNotNull(fSize); } @Override public boolean equals(Object object) { if (object == null || !DartElementImageDescriptor.class.equals(object.getClass())) { return false; } DartElementImageDescriptor other = (DartElementImageDescriptor) object; return (fBaseImage.equals(other.fBaseImage) && fFlags == other.fFlags && fSize.equals(other.fSize)); } /** * Returns the current adornments. * * @return the current adornments */ public int getAdronments() { return fFlags; } /** * Returns the size of the image created by calling {@link #createImage()}. * * @return the size of the image created by calling {@link #createImage()} */ public Point getImageSize() { return new Point(fSize.x, fSize.y); } @Override public int hashCode() { return fBaseImage.hashCode() | fFlags | fSize.hashCode(); } /** * Sets the descriptors adornments. Valid values are: {@link #ABSTRACT}, {@link #FINAL}, * {@link #SYNCHRONIZED}, {@link #STATIC}, {@link #RUNNABLE}, {@link #WARNING}, {@link #ERROR}, * {@link #OVERRIDES}, {@link #IMPLEMENTS}, {@link #CONSTRUCTOR}, {@link #VOLATILE}, * {@link #TRANSIENT}, {@link #CONST}, {@link #GETTER}, {@link #SETTER} or any combination of * those. * * @param adornments the image descriptors adornments */ public void setAdornments(int adornments) { Assert.isTrue(adornments >= 0); fFlags = adornments; } /** * Sets the size of the image created by calling {@link #createImage()}. * * @param size the size of the image returned from calling {@link #createImage()} */ public void setImageSize(Point size) { Assert.isNotNull(size); Assert.isTrue(size.x >= 0 && size.y >= 0); fSize = size; } @Override protected void drawCompositeImage(int width, int height) { ImageData bg = getImageData(fBaseImage); drawImage(bg, 0, 0); drawTopRight(); drawBottomRight(); drawBottomLeft(); } @Override protected Point getSize() { return fSize; } private void addBottomLeftImage(ImageDescriptor desc, Point pos) { ImageData data = getImageData(desc); int x = pos.x; int y = pos.y - data.height; if (x + data.width < getSize().x && y >= 0) { drawImage(data, x, y); pos.x = x + data.width; } } private void addBottomRightImage(ImageDescriptor desc, Point pos) { ImageData data = getImageData(desc); int x = pos.x - data.width; int y = pos.y - data.height; if (x >= 0 && y >= 0) { drawImage(data, x, y); pos.x = x; } } private void addTopRightImage(ImageDescriptor desc, Point pos) { ImageData data = getImageData(desc); int x = pos.x - data.width; if (x >= 0) { drawImage(data, x, pos.y); pos.x = x; } } private void drawBottomLeft() { Point pos = new Point(0, getSize().y); if ((fFlags & ERROR) != 0) { addBottomLeftImage(DartPluginImages.DESC_OVR_ERROR, pos); } if ((fFlags & WARNING) != 0) { addBottomLeftImage(DartPluginImages.DESC_OVR_WARNING, pos); } if ((fFlags & LINKED) != 0) { addBottomLeftImage(DartPluginImages.DESC_OVR_LINKED, pos); } } private void drawBottomRight() { Point size = getSize(); Point pos = new Point(size.x, size.y); int flags = fFlags; int syncAndOver = SYNCHRONIZED | OVERRIDES; int syncAndImpl = SYNCHRONIZED | IMPLEMENTS; if ((flags & syncAndOver) == syncAndOver) { // both flags set: merged // overlay image addBottomRightImage(DartPluginImages.DESC_OVR_SYNCH_AND_OVERRIDES, pos); flags &= ~syncAndOver; // clear to not render again } else if ((flags & syncAndImpl) == syncAndImpl) { // both flags set: merged // overlay image addBottomRightImage(DartPluginImages.DESC_OVR_SYNCH_AND_IMPLEMENTS, pos); flags &= ~syncAndImpl; // clear to not render again } if ((flags & OVERRIDES) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_OVERRIDES, pos); } if ((flags & IMPLEMENTS) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_IMPLEMENTS, pos); } if ((flags & SYNCHRONIZED) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_SYNCH, pos); } if ((flags & RUNNABLE) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_RUN, pos); } // if ((flags & TRANSIENT) != 0) { // addBottomRightImage(DartPluginImages.DESC_OVR_TRANSIENT, pos); // } if ((flags & GETTER) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_GETTER, pos); } if ((flags & SETTER) != 0) { addBottomRightImage(DartPluginImages.DESC_OVR_SETTER, pos); } } private void drawTopRight() { Point pos = new Point(getSize().x, 0); if ((fFlags & ABSTRACT) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_ABSTRACT, pos); } if ((fFlags & CONSTRUCTOR) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_CONSTRUCTOR, pos); } if ((fFlags & FINAL) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_FINAL, pos); } if ((fFlags & VOLATILE) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_VOLATILE, pos); } if ((fFlags & STATIC) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_STATIC, pos); } if ((fFlags & CONST) != 0) { addTopRightImage(DartPluginImages.DESC_OVR_FINAL, pos); } } private ImageData getImageData(ImageDescriptor descriptor) { ImageData data = descriptor.getImageData(); // see bug 51965: getImageData // can return null if (data == null) { data = DEFAULT_IMAGE_DATA; DartToolsPlugin.logErrorMessage("Image data not available: " + descriptor.toString()); //$NON-NLS-1$ } return data; } }