refactory: added UI removed from core plugin.

[phpeclipse.git] / net.sourceforge.phpeclipse.ui / src / net / sourceforge / phpdt / internal / ui / text / HTMLTextPresenter.java

diff --git a/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/HTMLTextPresenter.java b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/HTMLTextPresenter.java
new file mode 100644 (file)
index 0000000..aa21538
--- /dev/null
+++ b/net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/HTMLTextPresenter.java
@@ -0,0 +1,196 @@
+package net.sourceforge.phpdt.internal.ui.text;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved.
+ */
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.Iterator;
+
+import net.sourceforge.phpdt.internal.ui.PHPUIMessages;
+import net.sourceforge.phpeclipse.ui.WebUI;
+//import net.sourceforge.phpeclipse.PHPeclipsePlugin;
+
+import org.eclipse.jface.text.DefaultInformationControl;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.TextPresentation;
+import org.eclipse.swt.custom.StyleRange;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.widgets.Display;
+
+public class HTMLTextPresenter implements
+               DefaultInformationControl.IInformationPresenter {
+
+       private static final String LINE_DELIM = System.getProperty(
+                       "line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
+
+       private int fCounter;
+
+       private boolean fEnforceUpperLineLimit;
+
+       public HTMLTextPresenter(boolean enforceUpperLineLimit) {
+               super();
+               fEnforceUpperLineLimit = enforceUpperLineLimit;
+       }
+
+       public HTMLTextPresenter() {
+               this(true);
+       }
+
+       protected Reader createReader(String hoverInfo,
+                       TextPresentation presentation) {
+               return new HTML2TextReader(new StringReader(hoverInfo), presentation);
+       }
+
+       protected void adaptTextPresentation(TextPresentation presentation,
+                       int offset, int insertLength) {
+
+               int yoursStart = offset;
+               int yoursEnd = offset + insertLength - 1;
+               yoursEnd = Math.max(yoursStart, yoursEnd);
+
+               Iterator e = presentation.getAllStyleRangeIterator();
+               while (e.hasNext()) {
+
+                       StyleRange range = (StyleRange) e.next();
+
+                       int myStart = range.start;
+                       int myEnd = range.start + range.length - 1;
+                       myEnd = Math.max(myStart, myEnd);
+
+                       if (myEnd < yoursStart)
+                               continue;
+
+                       if (myStart < yoursStart)
+                               range.length += insertLength;
+                       else
+                               range.start += insertLength;
+               }
+       }
+
+       private void append(StringBuffer buffer, String string,
+                       TextPresentation presentation) {
+
+               int length = string.length();
+               buffer.append(string);
+
+               if (presentation != null)
+                       adaptTextPresentation(presentation, fCounter, length);
+
+               fCounter += length;
+       }
+
+       private String getIndent(String line) {
+               int length = line.length();
+
+               int i = 0;
+               while (i < length && Character.isWhitespace(line.charAt(i)))
+                       ++i;
+
+               return (i == length ? line : line.substring(0, i)) + " "; //$NON-NLS-1$
+       }
+
+       /*
+        * @see IHoverInformationPresenter#updatePresentation(Display display,
+        *      String, TextPresentation, int, int)
+        */
+       public String updatePresentation(Display display, String hoverInfo,
+                       TextPresentation presentation, int maxWidth, int maxHeight) {
+
+               if (hoverInfo == null)
+                       return null;
+
+               GC gc = new GC(display);
+               try {
+
+                       StringBuffer buffer = new StringBuffer();
+                       int maxNumberOfLines = Math.round(maxHeight
+                                       / gc.getFontMetrics().getHeight());
+
+                       fCounter = 0;
+                       LineBreakingReader reader = new LineBreakingReader(createReader(
+                                       hoverInfo, presentation), gc, maxWidth);
+
+                       boolean lastLineFormatted = false;
+                       String lastLineIndent = null;
+
+                       String line = reader.readLine();
+                       boolean lineFormatted = reader.isFormattedLine();
+                       boolean firstLineProcessed = false;
+
+                       while (line != null) {
+
+                               if (fEnforceUpperLineLimit && maxNumberOfLines <= 0)
+                                       break;
+
+                               if (firstLineProcessed) {
+                                       if (!lastLineFormatted)
+                                               append(buffer, LINE_DELIM, null);
+                                       else {
+                                               append(buffer, LINE_DELIM, presentation);
+                                               if (lastLineIndent != null)
+                                                       append(buffer, lastLineIndent, presentation);
+                                       }
+                               }
+
+                               append(buffer, line, null);
+                               firstLineProcessed = true;
+
+                               lastLineFormatted = lineFormatted;
+                               if (!lineFormatted)
+                                       lastLineIndent = null;
+                               else if (lastLineIndent == null)
+                                       lastLineIndent = getIndent(line);
+
+                               line = reader.readLine();
+                               lineFormatted = reader.isFormattedLine();
+
+                               maxNumberOfLines--;
+                       }
+
+                       if (line != null) {
+                               append(buffer, LINE_DELIM, lineFormatted ? presentation : null);
+                               append(buffer, PHPUIMessages
+                                               .getString("HTMLTextPresenter.ellipsis"), presentation); //$NON-NLS-1$
+                       }
+
+                       return trim(buffer, presentation);
+
+               } catch (IOException e) {
+
+                       WebUI.log(e);
+                       return null;
+
+               } finally {
+                       gc.dispose();
+               }
+       }
+
+       private String trim(StringBuffer buffer, TextPresentation presentation) {
+
+               int length = buffer.length();
+
+               int end = length - 1;
+               while (end >= 0 && Character.isWhitespace(buffer.charAt(end)))
+                       --end;
+
+               if (end == -1)
+                       return ""; //$NON-NLS-1$
+
+               if (end < length - 1)
+                       buffer.delete(end + 1, length);
+               else
+                       end = length;
+
+               int start = 0;
+               while (start < end && Character.isWhitespace(buffer.charAt(start)))
+                       ++start;
+
+               buffer.delete(0, start);
+               presentation.setResultWindow(new Region(start, buffer.length()));
+               return buffer.toString();
+       }
+}