diff options
Diffstat (limited to 'BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/HelpLinkFocusManager.java')
| -rw-r--r-- | BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/HelpLinkFocusManager.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/HelpLinkFocusManager.java b/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/HelpLinkFocusManager.java new file mode 100644 index 00000000..f5882b3d --- /dev/null +++ b/BKUCommonGUI/src/main/java/at/gv/egiz/bku/gui/HelpLinkFocusManager.java @@ -0,0 +1,138 @@ +package at.gv.egiz.bku.gui;
+
+import java.awt.Color;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.net.URL;
+
+import javax.accessibility.AccessibleHyperlink;
+import javax.accessibility.AccessibleHypertext;
+import javax.swing.JEditorPane;
+import javax.swing.event.HyperlinkEvent;
+import javax.swing.text.DefaultStyledDocument;
+import javax.swing.text.Element;
+import javax.swing.text.MutableAttributeSet;
+import javax.swing.text.SimpleAttributeSet;
+import javax.swing.text.StyleConstants;
+
+/**
+ *
+ * @author Thomas Zefferer <thomas.zefferer@iaik.tugraz.at>
+ */
+public final class HelpLinkFocusManager extends KeyAdapter {
+
+ private static final int FOCUS_UNDEFINED = -1;
+
+ private int focusedHyperlinkIndex = FOCUS_UNDEFINED;
+ private JEditorPane displayPane;
+
+ public HelpLinkFocusManager(JEditorPane displayPane) {
+
+ super();
+ this.displayPane = displayPane;
+ }
+
+ public void keyPressed(KeyEvent e) {
+
+ AccessibleHypertext accessibleHypertext = (AccessibleHypertext) this.displayPane
+ .getAccessibleContext().getAccessibleText();
+
+ if (accessibleHypertext.getLinkCount() > 0) {
+ switch (e.getKeyCode()) {
+
+ case KeyEvent.VK_RIGHT:
+ if (this.focusedHyperlinkIndex != FOCUS_UNDEFINED) {
+ removeHyperlinkFocus();
+ }
+
+ this.focusedHyperlinkIndex++;
+
+ if (this.focusedHyperlinkIndex >= accessibleHypertext
+ .getLinkCount()) {
+
+ this.focusedHyperlinkIndex = 0;
+ }
+
+ setHyperlinkFocus();
+ break;
+
+ case KeyEvent.VK_LEFT:
+ if (this.focusedHyperlinkIndex != FOCUS_UNDEFINED) {
+ removeHyperlinkFocus();
+ }
+
+ this.focusedHyperlinkIndex--;
+
+ if (this.focusedHyperlinkIndex < 0) {
+ this.focusedHyperlinkIndex = accessibleHypertext
+ .getLinkCount() - 1;
+ }
+
+ setHyperlinkFocus();
+ break;
+
+ case KeyEvent.VK_SPACE:
+ case KeyEvent.VK_ENTER:
+
+
+ AccessibleHyperlink link = accessibleHypertext
+ .getLink(this.focusedHyperlinkIndex);
+ if (link != null) {
+ URL url = (URL) link.getAccessibleActionObject(0);
+ Element element = ((DefaultStyledDocument) this.displayPane
+ .getDocument()).getCharacterElement(link
+ .getStartIndex());
+ HyperlinkEvent linkEvent = new HyperlinkEvent(
+ this.displayPane,
+ HyperlinkEvent.EventType.ACTIVATED, url, null,
+ element);
+ this.displayPane.fireHyperlinkUpdate(linkEvent);
+ }
+
+ removeHyperlinkFocus();
+ this.focusedHyperlinkIndex = FOCUS_UNDEFINED;
+ break;
+ default:
+ // nothig to do
+ break;
+ }
+ }
+ }
+
+ private void setHyperlinkFocus() {
+
+ AccessibleHypertext accessibleHypertext = (AccessibleHypertext) this.displayPane
+ .getAccessibleContext().getAccessibleText();
+ AccessibleHyperlink link = accessibleHypertext
+ .getLink(this.focusedHyperlinkIndex);
+
+ if (link != null) {
+
+ MutableAttributeSet style = new SimpleAttributeSet();
+ StyleConstants.setForeground(style, Color.RED);
+ ((DefaultStyledDocument) this.displayPane.getDocument())
+ .setCharacterAttributes(link.getStartIndex(), link
+ .getEndIndex()
+ - link.getStartIndex(), style, false);
+ }
+ }
+
+ private void removeHyperlinkFocus() {
+ Color textColor = Color.BLUE;
+ AccessibleHypertext accessibleHypertext = (AccessibleHypertext) this.displayPane
+ .getAccessibleContext().getAccessibleText();
+ AccessibleHyperlink link = accessibleHypertext
+ .getLink(this.focusedHyperlinkIndex);
+
+ if (link != null) {
+
+ MutableAttributeSet style = new SimpleAttributeSet();
+ StyleConstants.setForeground(style, textColor);
+ ((DefaultStyledDocument) this.displayPane.getDocument())
+ .setCharacterAttributes(link.getStartIndex(), link
+ .getEndIndex()
+ - link.getStartIndex(), style, false);
+ }
+ }
+
+}
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