Migrate CMS link to pure SWT

diff --git a/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/CmsLink.java b/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/CmsLink.java
new file mode 100644 (file)
index 0000000..a3bfa8e
--- /dev/null
+++ b/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/CmsLink.java
@@ -0,0 +1,238 @@
+package org.argeo.cms.swt.widgets;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import org.argeo.api.cms.CmsLog;
+import org.argeo.api.cms.ux.CmsStyle;
+import org.argeo.cms.swt.CmsSwtUtils;
+import org.eclipse.rap.rwt.RWT;
+import org.eclipse.rap.rwt.service.ResourceManager;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Label;
+import org.osgi.framework.BundleContext;
+
+/** A link to an internal or external location. */
+public class CmsLink {
+       private final static CmsLog log = CmsLog.getLog(CmsLink.class);
+       private BundleContext bundleContext;
+
+       private String label;
+       private String style;
+       private String target;
+       private String image;
+       private boolean openNew = false;
+       private MouseListener mouseListener;
+
+       private int horizontalAlignment = SWT.CENTER;
+       private int verticalAlignment = SWT.CENTER;
+
+       // internal
+       // private Boolean isUrl = false;
+       private Integer imageWidth, imageHeight;
+
+       public CmsLink() {
+               super();
+       }
+
+       public CmsLink(String label, String target) {
+               this(label, target, (String) null);
+       }
+
+       public CmsLink(String label, String target, CmsStyle style) {
+               this(label, target, style != null ? style.style() : null);
+       }
+
+       public CmsLink(String label, String target, String style) {
+               super();
+               this.label = label;
+               this.target = target;
+               this.style = style;
+               init();
+       }
+
+       public void init() {
+               if (image != null) {
+                       ImageData image = loadImage();
+                       if (imageHeight == null && imageWidth == null) {
+                               imageWidth = image.width;
+                               imageHeight = image.height;
+                       } else if (imageHeight == null) {
+                               imageHeight = (imageWidth * image.height) / image.width;
+                       } else if (imageWidth == null) {
+                               imageWidth = (imageHeight * image.width) / image.height;
+                       }
+               }
+       }
+
+       /** @return {@link Composite} with a single {@link Label} child. */
+       public Control createUi(Composite parent) {
+//             if (image != null && (imageWidth == null || imageHeight == null)) {
+//                     throw new CmsException("Image is not properly configured."
+//                                     + " Make sure bundleContext property is set and init() method has been called.");
+//             }
+
+               Composite comp = new Composite(parent, SWT.NONE);
+               comp.setLayout(CmsSwtUtils.noSpaceGridLayout());
+
+               Label link = new Label(comp, SWT.NONE);
+               CmsSwtUtils.markup(link);
+               GridData layoutData = new GridData(horizontalAlignment, verticalAlignment, false, false);
+               if (image != null) {
+                       if (imageHeight != null)
+                               layoutData.heightHint = imageHeight;
+                       if (label == null)
+                               if (imageWidth != null)
+                                       layoutData.widthHint = imageWidth;
+               }
+
+               link.setLayoutData(layoutData);
+               CmsSwtUtils.style(comp, style != null ? style : getDefaultStyle());
+               CmsSwtUtils.style(link, style != null ? style : getDefaultStyle());
+
+               // label
+               StringBuilder labelText = new StringBuilder();
+               if (target != null) {
+                       labelText.append("<a style='color:inherit;text-decoration:inherit;' href='");
+                       labelText.append(target).append("'");
+                       if (openNew) {
+                               labelText.append(" target='_blank'");
+                       }
+                       labelText.append(">");
+               }
+               if (image != null) {
+                       registerImageIfNeeded();
+                       String imageLocation = RWT.getResourceManager().getLocation(image);
+                       labelText.append("<img");
+                       if (imageWidth != null)
+                               labelText.append(" width='").append(imageWidth).append('\'');
+                       if (imageHeight != null)
+                               labelText.append(" height='").append(imageHeight).append('\'');
+                       labelText.append(" src=\"").append(imageLocation).append("\"/>");
+
+               }
+
+               if (label != null) {
+                       labelText.append(' ').append(label);
+               }
+
+               if (target != null)
+                       labelText.append("</a>");
+
+               link.setText(labelText.toString());
+
+               if (mouseListener != null)
+                       link.addMouseListener(mouseListener);
+
+               return comp;
+       }
+
+       private void registerImageIfNeeded() {
+               ResourceManager resourceManager = RWT.getResourceManager();
+               if (!resourceManager.isRegistered(image)) {
+                       URL res = getImageUrl();
+                       try (InputStream inputStream = res.openStream()) {
+                               resourceManager.register(image, inputStream);
+                               if (log.isTraceEnabled())
+                                       log.trace("Registered image " + image);
+                       } catch (IOException e) {
+                               throw new RuntimeException("Cannot load image " + image, e);
+                       }
+               }
+       }
+
+       private ImageData loadImage() {
+               URL url = getImageUrl();
+               ImageData result = null;
+               try (InputStream inputStream = url.openStream()) {
+                       result = new ImageData(inputStream);
+                       if (log.isTraceEnabled())
+                               log.trace("Loaded image " + image);
+               } catch (IOException e) {
+                       throw new RuntimeException("Cannot load image " + image, e);
+               }
+               return result;
+       }
+
+       private URL getImageUrl() {
+               URL url;
+               try {
+                       // pure URL
+                       url = new URL(image);
+               } catch (MalformedURLException e1) {
+                       url = bundleContext.getBundle().getResource(image);
+               }
+
+               if (url == null)
+                       throw new IllegalStateException("No image " + image + " available.");
+
+               return url;
+       }
+
+       public void setBundleContext(BundleContext bundleContext) {
+               this.bundleContext = bundleContext;
+       }
+
+       public void setLabel(String label) {
+               this.label = label;
+       }
+
+       public void setStyle(String style) {
+               this.style = style;
+       }
+
+       /** @deprecated Use {@link #setStyle(String)} instead. */
+       @Deprecated
+       public void setCustom(String custom) {
+               this.style = custom;
+       }
+
+       public void setTarget(String target) {
+               this.target = target;
+       }
+
+       public void setImage(String image) {
+               this.image = image;
+       }
+
+       public void setMouseListener(MouseListener mouseListener) {
+               this.mouseListener = mouseListener;
+       }
+
+       public void setvAlign(String vAlign) {
+               if ("bottom".equals(vAlign)) {
+                       verticalAlignment = SWT.BOTTOM;
+               } else if ("top".equals(vAlign)) {
+                       verticalAlignment = SWT.TOP;
+               } else if ("center".equals(vAlign)) {
+                       verticalAlignment = SWT.CENTER;
+               } else {
+                       throw new IllegalArgumentException(
+                                       "Unsupported vertical alignment " + vAlign + " (must be: top, bottom or center)");
+               }
+       }
+
+       public void setImageWidth(Integer imageWidth) {
+               this.imageWidth = imageWidth;
+       }
+
+       public void setImageHeight(Integer imageHeight) {
+               this.imageHeight = imageHeight;
+       }
+
+       public void setOpenNew(boolean openNew) {
+               this.openNew = openNew;
+       }
+
+       protected String getDefaultStyle() {
+               return "link";
+//             return SimpleStyle.link.name();
+       }
+}