Remove UI dependencies to JCR.

[lgpl/argeo-commons.git] / org.argeo.cms.ux / src / org / argeo / cms / ux / AbstractImageManager.java

diff --git a/org.argeo.cms.ux/src/org/argeo/cms/ux/AbstractImageManager.java b/org.argeo.cms.ux/src/org/argeo/cms/ux/AbstractImageManager.java
new file mode 100644 (file)
index 0000000..41c905e
--- /dev/null
+++ b/org.argeo.cms.ux/src/org/argeo/cms/ux/AbstractImageManager.java
@@ -0,0 +1,62 @@
+package org.argeo.cms.ux;
+
+import org.argeo.api.cms.ux.Cms2DSize;
+import org.argeo.api.cms.ux.CmsImageManager;
+
+/** Manages only public images so far. */
+public abstract class AbstractImageManager<V, M> implements CmsImageManager<V, M> {
+       public final static String NO_IMAGE = "icons/noPic-square-640px.png";
+       public final static Cms2DSize NO_IMAGE_SIZE = new Cms2DSize(320, 320);
+       public final static Float NO_IMAGE_RATIO = 1f;
+
+       protected Cms2DSize resizeTo(Cms2DSize orig, Cms2DSize constraints) {
+               if (constraints.getWidth() != 0 && constraints.getHeight() != 0) {
+                       return constraints;
+               } else if (constraints.getWidth() == 0 && constraints.getHeight() == 0) {
+                       return orig;
+               } else if (constraints.getHeight() == 0) {// force width
+                       return new Cms2DSize(constraints.getWidth(),
+                                       scale(orig.getHeight(), orig.getWidth(), constraints.getWidth()));
+               } else if (constraints.getWidth() == 0) {// force height
+                       return new Cms2DSize(scale(orig.getWidth(), orig.getHeight(), constraints.getHeight()),
+                                       constraints.getHeight());
+               }
+               throw new IllegalArgumentException("Cannot resize " + orig + " to " + constraints);
+       }
+
+       protected int scale(int origDimension, int otherDimension, int otherConstraint) {
+               return Math.round(origDimension * divide(otherConstraint, otherDimension));
+       }
+
+       protected float divide(int a, int b) {
+               return ((float) a) / ((float) b);
+       }
+
+       /** @return null if not available */
+       @Override
+       public String getImageTag(M node) {
+               return getImageTag(node, getImageSize(node));
+       }
+
+       protected String getImageTag(M node, Cms2DSize size) {
+               StringBuilder buf = getImageTagBuilder(node, size);
+               if (buf == null)
+                       return null;
+               return buf.append("/>").toString();
+       }
+
+       /** @return null if not available */
+       @Override
+       public StringBuilder getImageTagBuilder(M node, Cms2DSize size) {
+               return getImageTagBuilder(node, Integer.toString(size.getWidth()), Integer.toString(size.getHeight()));
+       }
+
+       /** @return null if not available */
+       protected StringBuilder getImageTagBuilder(M node, String width, String height) {
+               String url = getImageUrl(node);
+               if (url == null)
+                       return null;
+               return CmsUxUtils.imgBuilder(url, width, height);
+       }
+
+}