Source Code Cross Referenced for ProgressCanvasViewer.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » internal » progress » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.internal.progress 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2004, 2006 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *******************************************************************************/package org.eclipse.ui.internal.progress;
011:
012:        import java.util.ArrayList;
013:        import java.util.List;
014:
015:        import org.eclipse.core.runtime.Assert;
016:        import org.eclipse.jface.resource.JFaceResources;
017:        import org.eclipse.jface.viewers.IBaseLabelProvider;
018:        import org.eclipse.jface.viewers.ILabelProvider;
019:        import org.eclipse.swt.SWT;
020:        import org.eclipse.swt.events.DisposeEvent;
021:        import org.eclipse.swt.events.DisposeListener;
022:        import org.eclipse.swt.events.PaintEvent;
023:        import org.eclipse.swt.events.PaintListener;
024:        import org.eclipse.swt.graphics.FontMetrics;
025:        import org.eclipse.swt.graphics.GC;
026:        import org.eclipse.swt.graphics.Point;
027:        import org.eclipse.swt.graphics.Rectangle;
028:        import org.eclipse.swt.graphics.Transform;
029:        import org.eclipse.swt.widgets.Canvas;
030:        import org.eclipse.swt.widgets.Composite;
031:        import org.eclipse.swt.widgets.Control;
032:        import org.eclipse.swt.widgets.Display;
033:        import org.eclipse.swt.widgets.Widget;
034:        import org.eclipse.ui.internal.TrimUtil;
035:
036:        /**
037:         * The ProgressCanvasViewer is the viewer used by progress windows. It displays text
038:         * on the canvas.
039:         */
040:        public class ProgressCanvasViewer extends AbstractProgressViewer {
041:            Canvas canvas;
042:
043:            Object[] displayedItems = new Object[0];
044:
045:            private final static List EMPTY_LIST = new ArrayList();
046:
047:            /**
048:             * Font metrics to use for determining pixel sizes.
049:             */
050:            private FontMetrics fontMetrics;
051:
052:            private int numShowItems = 1;
053:
054:            private int maxCharacterWidth;
055:
056:            private int orientation = SWT.HORIZONTAL;
057:
058:            /**
059:             * Create a new instance of the receiver with the supplied
060:             * parent and style bits.
061:             * @param parent The composite the Canvas is created in
062:             * @param style style bits for the canvas
063:             * @param itemsToShow the number of items this will show
064:             * @param numChars The number of characters for the width hint.
065:             * @param side the side to display text, this helps determine horizontal vs vertical
066:             */
067:            ProgressCanvasViewer(Composite parent, int style, int itemsToShow,
068:                    int numChars, int orientation) {
069:                super ();
070:                this .orientation = orientation;
071:                numShowItems = itemsToShow;
072:                maxCharacterWidth = numChars;
073:                canvas = new Canvas(parent, style);
074:                hookControl(canvas);
075:                // Compute and store a font metric
076:                GC gc = new GC(canvas);
077:                gc.setFont(JFaceResources.getDefaultFont());
078:                fontMetrics = gc.getFontMetrics();
079:                gc.dispose();
080:                initializeListeners();
081:            }
082:
083:            /**
084:             * NE: Copied from ContentViewer.  We don't want the OpenStrategy hooked
085:             * in StructuredViewer.hookControl otherwise the canvas will take focus
086:             * since it has a key listener.  We don't want this included in the window's
087:             * tab traversal order.  Defeating it here is more self-contained then 
088:             * setting the tab list on the shell or other parent composite.
089:             */
090:            protected void hookControl(Control control) {
091:                control.addDisposeListener(new DisposeListener() {
092:                    public void widgetDisposed(DisposeEvent event) {
093:                        handleDispose(event);
094:                    }
095:                });
096:            }
097:
098:            /*
099:             * (non-Javadoc)
100:             * 
101:             * @see org.eclipse.jface.viewers.StructuredViewer#doFindInputItem(java.lang.Object)
102:             */
103:            protected Widget doFindInputItem(Object element) {
104:                return null; // No widgets associated with items
105:            }
106:
107:            /*
108:             * (non-Javadoc)
109:             * 
110:             * @see org.eclipse.jface.viewers.StructuredViewer#doFindItem(java.lang.Object)
111:             */
112:            protected Widget doFindItem(Object element) {
113:                return null; // No widgets associated with items
114:            }
115:
116:            /*
117:             * (non-Javadoc)
118:             * 
119:             * @see org.eclipse.jface.viewers.StructuredViewer#doUpdateItem(org.eclipse.swt.widgets.Widget,
120:             *      java.lang.Object, boolean)
121:             */
122:            protected void doUpdateItem(Widget item, Object element,
123:                    boolean fullMap) {
124:                canvas.redraw();
125:            }
126:
127:            /*
128:             * (non-Javadoc)
129:             * 
130:             * @see org.eclipse.jface.viewers.StructuredViewer#getSelectionFromWidget()
131:             */
132:            protected List getSelectionFromWidget() {
133:                //No selection on a Canvas
134:                return EMPTY_LIST;
135:            }
136:
137:            /*
138:             * (non-Javadoc)
139:             * 
140:             * @see org.eclipse.jface.viewers.StructuredViewer#internalRefresh(java.lang.Object)
141:             */
142:            protected void internalRefresh(Object element) {
143:                displayedItems = getSortedChildren(getRoot());
144:                canvas.redraw();
145:            }
146:
147:            /*
148:             * (non-Javadoc)
149:             * 
150:             * @see org.eclipse.jface.viewers.StructuredViewer#reveal(java.lang.Object)
151:             */
152:            public void reveal(Object element) {
153:                //Nothing to do here as we do not scroll
154:            }
155:
156:            /*
157:             * (non-Javadoc)
158:             * 
159:             * @see org.eclipse.jface.viewers.StructuredViewer#setSelectionToWidget(java.util.List,
160:             *      boolean)
161:             */
162:            protected void setSelectionToWidget(List l, boolean reveal) {
163:                //Do nothing as there is no selection
164:            }
165:
166:            /*
167:             * (non-Javadoc)
168:             * 
169:             * @see org.eclipse.jface.viewers.Viewer#getControl()
170:             */
171:            public Control getControl() {
172:                return canvas;
173:            }
174:
175:            private void initializeListeners() {
176:                canvas.addPaintListener(new PaintListener() {
177:                    /*
178:                     * (non-Javadoc)
179:                     * 
180:                     * @see org.eclipse.swt.events.PaintListener#paintControl(org.eclipse.swt.events.PaintEvent)
181:                     */
182:                    public void paintControl(PaintEvent event) {
183:
184:                        GC gc = event.gc;
185:                        Transform transform = null;
186:                        if (orientation == SWT.VERTICAL) {
187:                            transform = new Transform(event.display);
188:                            transform
189:                                    .translate(TrimUtil.TRIM_DEFAULT_HEIGHT, 0);
190:                            transform.rotate(90);
191:                        }
192:                        ILabelProvider labelProvider = (ILabelProvider) getLabelProvider();
193:
194:                        int itemCount = Math.min(displayedItems.length,
195:                                numShowItems);
196:
197:                        int yOffset = 0;
198:                        int xOffset = 0;
199:                        if (numShowItems == 1) {//If there is a single item try to center it
200:                            Rectangle clientArea = canvas.getParent()
201:                                    .getClientArea();
202:                            if (orientation == SWT.HORIZONTAL) {
203:                                int size = clientArea.height;
204:                                yOffset = size - (fontMetrics.getHeight());
205:                                yOffset = yOffset / 2;
206:                            } else {
207:                                int size = clientArea.width;
208:                                xOffset = size - (fontMetrics.getHeight());
209:                                xOffset = xOffset / 2;
210:                            }
211:                        }
212:
213:                        for (int i = 0; i < itemCount; i++) {
214:                            String string = labelProvider
215:                                    .getText(displayedItems[i]);
216:                            if (string == null) {
217:                                string = "";//$NON-NLS-1$
218:                            }
219:                            if (orientation == SWT.HORIZONTAL) {
220:                                gc.drawString(string, 2, yOffset
221:                                        + (i * fontMetrics.getHeight()), true);
222:                            } else {
223:                                gc.setTransform(transform);
224:                                gc.drawString(string, xOffset
225:                                        + (i * fontMetrics.getHeight()), 2,
226:                                        true);
227:                            }
228:                        }
229:                        if (transform != null)
230:                            transform.dispose();
231:                    }
232:                });
233:            }
234:
235:            /* (non-Javadoc)
236:             * @see org.eclipse.jface.viewers.ContentViewer#setLabelProvider(org.eclipse.jface.viewers.IBaseLabelProvider)
237:             */
238:            public void setLabelProvider(IBaseLabelProvider labelProvider) {
239:                Assert.isTrue(labelProvider instanceof  ILabelProvider);
240:                super .setLabelProvider(labelProvider);
241:            }
242:
243:            /**
244:             * Get the size hints for the receiver. These are used for 
245:             * layout data.
246:             * @return Point - the preferred x and y coordinates
247:             */
248:            public Point getSizeHints() {
249:
250:                Display display = canvas.getDisplay();
251:
252:                GC gc = new GC(canvas);
253:                FontMetrics fm = gc.getFontMetrics();
254:                int charWidth = fm.getAverageCharWidth();
255:                int charHeight = fm.getHeight();
256:                int maxWidth = display.getBounds().width / 2;
257:                int maxHeight = display.getBounds().height / 6;
258:                int fontWidth = charWidth * maxCharacterWidth;
259:                int fontHeight = charHeight * numShowItems;
260:                if (maxWidth < fontWidth) {
261:                    fontWidth = maxWidth;
262:                }
263:                if (maxHeight < fontHeight) {
264:                    fontHeight = maxHeight;
265:                }
266:                gc.dispose();
267:                return new Point(fontWidth, fontHeight);
268:            }
269:
270:            /* (non-Javadoc)
271:             * @see org.eclipse.ui.internal.progress.AbstractProgressViewer#add(java.lang.Object[])
272:             */
273:            public void add(Object[] elements) {
274:                refresh(true);
275:
276:            }
277:
278:            /* (non-Javadoc)
279:             * @see org.eclipse.ui.internal.progress.AbstractProgressViewer#remove(java.lang.Object[])
280:             */
281:            public void remove(Object[] elements) {
282:                refresh(true);
283:
284:            }
285:
286:        }
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