Unexport feature added

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractCPropertyTab.java

@@ -240,6 +240,12 @@ public abstract class AbstractCPropertyTab implements ICPropertyTab {
 	 */
 	protected void buttonPressed(int i) {}
 	
+	/**
+	 * Checks state of existing button.
+	 * 
+	 * @param i - button index
+	 * @return - true if button exists and enabled 
+	 */
 	protected boolean buttonIsEnabled(int i) {
 		if (buttons == null || buttons.length <= i ) 
 			return false;
@@ -247,11 +253,30 @@ public abstract class AbstractCPropertyTab implements ICPropertyTab {
 			return buttons[i].isEnabled();
 	}
 	
+	/**
+	 * Changes state of existing button.
+	 * Does nothing if index is invalid
+	 * 
+	 * @param i - button index
+	 * @param state - required state
+	 */
 	protected void buttonSetEnabled(int i, boolean state) {
 		if (buttons == null || buttons.length <= i ) return;
 		buttons[i].setEnabled(state);
 	}
 	
+	/**
+	 * Changes text of existing button
+	 * Does nothing if index is invalid
+	 * 
+	 * @param i - button index
+	 * @param text - text to display
+	 */
+	protected void buttonSetText(int i, String text) {
+		if (buttons == null || buttons.length <= i ) return;
+		buttons[i].setText(text);
+	}
+
 	/**********************************************
 	 * Utility methods for unified widget creation
 	 **********************************************/

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/AbstractLangsListTab.java

@@ -176,6 +176,12 @@ public abstract class AbstractLangsListTab extends AbstractCPropertyTab {
 			ICLanguageSettingEntry ent = (ICLanguageSettingEntry)(table.getItem(index).getData());
 			if (ent.isBuiltIn() || ent.isReadOnly()) canEdit = false;
 			if (ent.isReadOnly()) canDelete = false;
+			if (exported.contains(ent))
+				buttonSetText(3, UIMessages.getString("AbstractLangsListTab.4")); //$NON-NLS-1$
+			else
+				buttonSetText(3, UIMessages.getString("AbstractLangsListTab.2")); //$NON-NLS-1$
+		} else {
+			buttonSetText(3, UIMessages.getString("AbstractLangsListTab.2")); //$NON-NLS-1$
 		}
     	boolean canMoveUp = canDelete && index > 0;
     	boolean canMoveDown = canDelete && (index < table.getItemCount() - 1); 
@@ -367,10 +373,14 @@ public abstract class AbstractLangsListTab extends AbstractCPropertyTab {
 			lang.setSettingEntries(getKind(), incs);
 			update();
 			break;
-		case 3: // export	
+		case 3: // toggle export	
 			if (n == -1) return;
 			old = (ICLanguageSettingEntry)(table.getItem(n).getData());
+			if (exported.contains(old)) {
+				deleteExportSetting(old);
+			} else {
 				page.getResDesc().getConfiguration().createExternalSetting(new String[] {lang.getId()}, null, null, new ICLanguageSettingEntry[] {old});
+			}
 			updateExport();
 			update();
 			break;
@@ -395,6 +405,33 @@ public abstract class AbstractLangsListTab extends AbstractCPropertyTab {
 		}
 	}
 
+	private void deleteExportSetting(ICSettingEntry ent) {
+//		if (ent.isReadOnly() || ent.isBuiltIn()) continue;
+		ICConfigurationDescription cfg = getResDesc().getConfiguration();
+		ICExternalSetting[] vals = cfg.getExternalSettings();
+		if (!(vals == null || vals.length == 0)) {
+			for (int i=0; i<vals.length; i++) {
+				ICSettingEntry[] ents = vals[i].getEntries(getKind());
+				if (ents == null || ents.length == 0) continue;
+				for (int j=0; j<ents.length; j++) {
+					if (ents[j].equalsByName(ent)) {
+						ICSettingEntry[] arr = new ICSettingEntry[ents.length - 1];
+						int index = 0;
+						for (int k=0; k<ents.length; k++) 
+							if (k != j) arr[index++] = ents[k];
+						cfg.removeExternalSetting(vals[i]);
+						cfg.createExternalSetting(vals[i].getCompatibleLanguageIds(), 
+								vals[i].getCompatibleContentTypeIds(),
+								vals[i].getCompatibleExtensions(),
+								arr);
+						return;
+					}
+				}
+			}
+		}
+	}
+	
+	
 	/**
 	 * Adds entry to all configurations 
 	 * @param ent - entry to add

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/ui/newui/PluginResources.properties

@@ -406,6 +406,7 @@ AbstractLangsListTab.0=Show built-in values
 AbstractLangsListTab.1=Languages
 AbstractLangsListTab.2=Export
 AbstractLangsListTab.3=\ [exp]
+AbstractLangsListTab.4=Unexport
 AbstractPrefPage.0=Preference settings will be applied to new projects\n
 AbstractPrefPage.1=only in case when there was no toolchains selected.
 AbstractExportTab.0=[All]