Java tutorial
/******************************************************************************* * Copyright (c) 2012, 2015 IBM Corporation 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: * IBM Corporation - initial API and implementation * Sopot Cela <scela@redhat.com> - Bug 472761 *******************************************************************************/ package org.eclipse.e4.ui.internal.workbench.swt; import java.net.URL; import java.util.HashMap; import java.util.Map; import org.eclipse.core.runtime.FileLocator; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.Path; import org.eclipse.e4.ui.css.core.engine.CSSEngine; import org.eclipse.e4.ui.css.swt.dom.ControlElement; import org.eclipse.e4.ui.css.swt.dom.WidgetElement; import org.eclipse.e4.ui.widgets.ImageBasedFrame; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.JFaceResources; 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.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.PaletteData; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.graphics.Transform; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.osgi.framework.Bundle; import org.w3c.dom.css.CSSPrimitiveValue; import org.w3c.dom.css.CSSStyleDeclaration; import org.w3c.dom.css.CSSValue; import org.w3c.dom.css.CSSValueList; public class CSSRenderingUtils { private static final String DRAG_HANDLE = "org.eclipse.e4.ui.workbench.swt.DRAG_HANDLE"; private final static String FRAME_IMAGE_PROP = "frame-image"; private final static String HANDLE_IMAGE_PROP = "handle-image"; // NOTE: The CSS engine 'owns' the image it returns (it caches it) // so we have to cache any rotated versions to match private Map<Image, Image> rotatedImageMap = new HashMap<Image, Image>(); public Control frameMeIfPossible(Control toFrame, String classId, boolean vertical, boolean draggable) { Integer[] frameInts = new Integer[4]; Image frameImage = createImage(toFrame, classId, FRAME_IMAGE_PROP, frameInts); if (vertical && frameImage != null) frameImage = rotateImage(toFrame.getDisplay(), frameImage, frameInts); Image handleImage = createImage(toFrame, classId, HANDLE_IMAGE_PROP, null); if ((handleImage == null) && (draggable)) { // need to feed default image otherwise the toolbar DnD won't work // see bug 472761 handleImage = JFaceResources.getImage(DRAG_HANDLE); if (handleImage == null) { handleImage = initDragHandleResource(); } } if (vertical && handleImage != null) handleImage = rotateImage(toFrame.getDisplay(), handleImage, null); if (frameImage != null) { ImageBasedFrame frame = new ImageBasedFrame(toFrame.getParent(), toFrame, vertical, draggable); frame.setImages(frameImage, frameInts, handleImage); addFrameImageDisposedListener(frame, toFrame, classId, vertical); return frame; } else if (handleImage != null) { ImageBasedFrame frame = new ImageBasedFrame(toFrame.getParent(), toFrame, vertical, draggable); frame.setImages(null, null, handleImage); addHandleImageDisposedListener(frame, toFrame, classId, vertical); return frame; } return toFrame; } private Image initDragHandleResource() { Bundle bundle = org.eclipse.e4.ui.internal.workbench.swt.WorkbenchSWTActivator.getDefault().getBundle(); IPath path = new Path("$ws$/images/dragHandle.png"); URL url = FileLocator.find(bundle, path, null); ImageDescriptor desc = ImageDescriptor.createFromURL(url); if (desc != null) JFaceResources.getImageRegistry().put(DRAG_HANDLE, desc); return JFaceResources.getImage(DRAG_HANDLE); } private Image rotateImage(Display display, Image image, Integer[] frameInts) { // Swap the widths / heights of the 'cuts' if (frameInts != null) { int tmp; tmp = frameInts[0]; frameInts[0] = frameInts[2]; frameInts[2] = tmp; tmp = frameInts[1]; frameInts[1] = frameInts[3]; frameInts[3] = tmp; } if (rotatedImageMap.get(image) != null) return rotatedImageMap.get(image); // rotate 90 degrees,,, Rectangle bounds = image.getBounds(); ImageData imageData = new ImageData(bounds.height, bounds.width, 32, new PaletteData(0xFF0000, 0x00FF00, 0x0000FF)); Image rotatedImage = new Image(display, imageData); GC gc = new GC(rotatedImage); RGB rgb = new RGB(0x7d, 0, 0); Color offRed = new Color(display, rgb); gc.setBackground(offRed); gc.fillRectangle(0, 0, bounds.height, bounds.width); Transform t = new Transform(display); int w = image.getBounds().height; int offset = 0; // (w+1) % 2; t.translate(w - offset, 0); t.rotate(90); gc.setTransform(t); gc.drawImage(image, 0, 0); gc.dispose(); t.dispose(); offRed.dispose(); ImageData alphaData = rotatedImage.getImageData(); rotatedImage.dispose(); int transparentPix = alphaData.palette.getPixel(rgb); for (int i = 0; i < alphaData.width; i++) { for (int j = 0; j < alphaData.height; j++) { if (alphaData.getPixel(i, j) != transparentPix) { alphaData.setAlpha(i, j, 255); } } } rotatedImage = new Image(display, alphaData); // ...and cache it rotatedImageMap.put(image, rotatedImage); // Return the new one return rotatedImage; } public CSSValue getCSSValue(Control styleControl, String className, String attributeName) { CSSEngine csseng = WidgetElement.getEngine(styleControl); if (csseng == null) { return null; } ControlElement tempEment = (ControlElement) csseng.getElement(styleControl); if (tempEment == null) { return null; } // super hack if (className != null) WidgetElement.setCSSClass(styleControl, className); CSSStyleDeclaration styleDeclarations = csseng.getViewCSS().getComputedStyle(tempEment, ""); //$NON-NLS-1$ if (styleDeclarations == null) return null; return styleDeclarations.getPropertyCSSValue(attributeName); } /** * @param string * @param string2 * @return */ public Image createImage(Control styleControl, String classId, String attName, Integer[] frameInts) { Image image = null; CSSEngine csseng = WidgetElement.getEngine(styleControl); if (csseng == null) { return null; } ControlElement tempEment = (ControlElement) csseng.getElement(styleControl); if (tempEment == null) { return null; } if (classId != null) ControlElement.setCSSClass(styleControl, classId); //$NON-NLS-1$ CSSStyleDeclaration styleDeclarations = csseng.getViewCSS().getComputedStyle(tempEment, ""); if (styleDeclarations == null) return null; CSSValue imagePath = styleDeclarations.getPropertyCSSValue(attName); //$NON-NLS-1$ if (imagePath == null) return null; if (imagePath != null && imagePath.getCssValueType() == CSSValue.CSS_PRIMITIVE_VALUE) { // String imageString = ((CSSPrimitiveValue) imagePath) // .getStringValue(); // System.out.println("here" + imageString); try { image = (Image) csseng.convert(imagePath, Image.class, styleControl.getDisplay()); if (image != null && frameInts != null) { CSSValue value = styleDeclarations.getPropertyCSSValue("frame-cuts"); //$NON-NLS-1$ if (value.getCssValueType() == CSSValue.CSS_VALUE_LIST) { CSSValueList valueList = (CSSValueList) value; if (valueList.getLength() != 4) return null; for (int i = 0; i < valueList.getLength(); i++) { CSSValue val = valueList.item(i); if ((val.getCssValueType() == CSSValue.CSS_PRIMITIVE_VALUE) && ((CSSPrimitiveValue) val).getPrimitiveType() == CSSPrimitiveValue.CSS_PX) { frameInts[i] = (int) ((CSSPrimitiveValue) val) .getFloatValue(CSSPrimitiveValue.CSS_PX); } else { return null; } } // System.out.println("Results " + frameInts); } } } catch (Exception e1) { } } return image; } private void addHandleImageDisposedListener(ImageBasedFrame imageBasedFrame, final Control toFrame, final String classId, final boolean vertical) { final Listener listener = new Listener() { @Override public void handleEvent(Event event) { if (!(event.widget instanceof ImageBasedFrame)) { return; } ImageBasedFrame frame = (ImageBasedFrame) event.widget; if (!isImagesRefreshRequired(frame)) { return; } Image handleImage = createImage(toFrame, classId, HANDLE_IMAGE_PROP, null); if (vertical && handleImage != null) { handleImage = rotateImage(toFrame.getDisplay(), handleImage, null); } if (handleImage != null) { frame.setImages(null, null, handleImage); } } }; toFrame.getDisplay().addListener(SWT.Skin, listener); imageBasedFrame.addDisposeListener(new DisposeListener() { @Override public void widgetDisposed(DisposeEvent e) { e.widget.getDisplay().removeListener(SWT.Skin, listener); } }); } private void addFrameImageDisposedListener(ImageBasedFrame imageBasedFrame, final Control toFrame, final String classId, final boolean vertical) { final Listener listener = new Listener() { @Override public void handleEvent(Event event) { if (!(event.widget instanceof ImageBasedFrame)) { return; } ImageBasedFrame frame = (ImageBasedFrame) event.widget; if (!isImagesRefreshRequired(frame)) { return; } Integer[] frameInts = new Integer[4]; Image frameImage = createImage(toFrame, classId, FRAME_IMAGE_PROP, frameInts); if (vertical && frameImage != null) { frameImage = rotateImage(toFrame.getDisplay(), frameImage, frameInts); } Image handleImage = createImage(toFrame, classId, HANDLE_IMAGE_PROP, null); if (vertical && handleImage != null) { handleImage = rotateImage(toFrame.getDisplay(), handleImage, null); } if (frameImage != null) { frame.setImages(frameImage, frameInts, handleImage); } } }; toFrame.getDisplay().addListener(SWT.Skin, listener); imageBasedFrame.addDisposeListener(new DisposeListener() { @Override public void widgetDisposed(DisposeEvent e) { e.widget.getDisplay().removeListener(SWT.Skin, listener); } }); } private boolean isImagesRefreshRequired(ImageBasedFrame frame) { Object handleImage = frame.getData("handleImage"); if (handleImage instanceof Image && ((Image) handleImage).isDisposed()) { return true; } Object frameImage = frame.getData("frameImage"); if (frameImage instanceof Image && ((Image) frameImage).isDisposed()) { return true; } return false; } }