Preference page added to control Property Pages behaviour

build/org.eclipse.cdt.managedbuilder.ui/plugin.properties

@@ -88,3 +88,4 @@ Error.parsers=Error parsers
 Data.hierarchy=Data hierarchy
 Preferred.toolchains=Preferred toolchains
 Wizard.defaults=Wizard defaults
+PropertyPage.defaults=Property page settings

build/org.eclipse.cdt.managedbuilder.ui/plugin.xml

@@ -90,13 +90,13 @@
       <page
             name="%MakeBuildPref.name"
             category="org.eclipse.cdt.managedbuilder.ui.preferences.WizardPreferences"
-            class="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTProject"
+            class="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTProject"
             id="org.eclipse.cdt.managedbuilder.ui.preferences.BuildPreferences">
       </page>
       <page
             name="%NewCDTWizardPref.name"
             category="org.eclipse.cdt.ui.preferences.CPluginPreferencePage"
-            class="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTWizard"
+            class="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTWizard"
             id="org.eclipse.cdt.managedbuilder.ui.preferences.WizardPreferences">
       </page>
    </extension>
@@ -324,12 +324,12 @@
            name="%Output.location"
            weight="009"           
            parent="org.eclipse.cdt.ui.newui.Page_PathAndSymb"/>
-     <!--tab
+     <tab
            class="org.eclipse.cdt.ui.newui.StructureTreeTab"
            icon="icons/obj16/hierarchy.gif"
            name="%Data.hierarchy"
            parent="org.eclipse.cdt.ui.newui.Page_PathAndSymb"
-           weight="012"/-->
+           weight="012"/>
      <tab
            class="org.eclipse.cdt.ui.newui.EnvironmentTab"
            icon="icons/obj16/environment.gif"
@@ -392,34 +392,40 @@
            class="org.eclipse.cdt.ui.newui.BinaryParsTab"
            name="%Binary.parsers"
            icon="icons/obj16/bin_obj.gif"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTProject"
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTProject"
            />
      <tab
            class="org.eclipse.cdt.ui.newui.ErrorParsTab"
            name="%Error.parsers"
            icon="icons/obj16/error_obj.gif"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTProject"
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTProject"
            />
      <tab
            class="org.eclipse.cdt.managedbuilder.ui.properties.DiscoveryTab"
            icon="icons/elcl16/discovery.gif"
            name="%Discovery.options"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTProject"
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTProject"
            />
      <tab
            class="org.eclipse.cdt.managedbuilder.ui.properties.BuilderSettingsTab"
            icon="icons/obj16/build_settings.gif"
            name="%Builder.settings"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTProject"/>
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTProject"/>
 
      <tab
-           class="org.eclipse.cdt.managedbuilder.ui.properties.PreferredToolchainsTab"
+           class="org.eclipse.cdt.managedbuilder.ui.preferences.PreferredToolchainsTab"
            name="%Preferred.toolchains"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTWizard"/>
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTWizard"/>
      <tab
-           class="org.eclipse.cdt.managedbuilder.ui.properties.WizardDefaultsTab"
+           class="org.eclipse.cdt.managedbuilder.ui.preferences.WizardDefaultsTab"
            name="%Wizard.defaults"
-           parent="org.eclipse.cdt.managedbuilder.ui.properties.PrefPage_NewCDTWizard"/>
+           parent="org.eclipse.cdt.managedbuilder.ui.preferences.PrefPage_NewCDTWizard"/>
+
+     <tab
+           class="org.eclipse.cdt.ui.newui.PropertyPageDefsTab"
+           name="%PropertyPage.defaults"
+           parent="org.eclipse.cdt.ui.newui.PrefPage_PropertyPage"/>
+
 
   </extension>   
 

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PrefPage_NewCDTProject.java

@@ -9,7 +9,7 @@
  * Intel Corporation - Initial API and implementation
  *******************************************************************************/
 
-package org.eclipse.cdt.managedbuilder.ui.properties;
+package org.eclipse.cdt.managedbuilder.ui.preferences;
 
 import org.eclipse.cdt.core.CCorePlugin;
 import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PrefPage_NewCDTWizard.java

@@ -9,9 +9,10 @@
  * Intel Corporation - Initial API and implementation
  *******************************************************************************/
 
-package org.eclipse.cdt.managedbuilder.ui.properties;
+package org.eclipse.cdt.managedbuilder.ui.preferences;
 
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+import org.eclipse.cdt.managedbuilder.ui.properties.Messages;
 import org.eclipse.cdt.ui.newui.AbstractPrefPage;
 import org.eclipse.cdt.ui.newui.ICPropertyTab;
 

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/PreferredToolchainsTab.java

@@ -8,10 +8,13 @@
  * Contributors:
  *     Intel Corporation - initial API and implementation
  *******************************************************************************/
-package org.eclipse.cdt.managedbuilder.ui.properties;
+package org.eclipse.cdt.managedbuilder.ui.preferences;
 
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
 import org.eclipse.cdt.managedbuilder.core.IToolChain;
+import org.eclipse.cdt.managedbuilder.ui.properties.AbstractCBuildPropertyTab;
+import org.eclipse.cdt.managedbuilder.ui.properties.Messages;
+import org.eclipse.cdt.managedbuilder.ui.properties.PageLayout;
 import org.eclipse.cdt.managedbuilder.ui.wizards.CMainWizardPage;
 import org.eclipse.cdt.managedbuilder.ui.wizards.ICWizardHandler;
 import org.eclipse.cdt.ui.newui.CDTPrefUtil;

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/preferences/WizardDefaultsTab.java

@@ -8,9 +8,10 @@
  * Contributors:
  *     Intel Corporation - initial API and implementation
  *******************************************************************************/
-package org.eclipse.cdt.managedbuilder.ui.properties;
+package org.eclipse.cdt.managedbuilder.ui.preferences;
 
 import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+import org.eclipse.cdt.managedbuilder.ui.properties.Messages;
 import org.eclipse.cdt.ui.newui.AbstractCPropertyTab;
 import org.eclipse.cdt.ui.newui.CDTPrefUtil;
 import org.eclipse.swt.SWT;
@@ -18,13 +19,11 @@ import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
-import org.eclipse.swt.widgets.Label;
 
 public class WizardDefaultsTab extends AbstractCPropertyTab {
 
     private Button show_sup;
     private Button show_oth;
-    private Button show_mng;
 
 	public void createControls(Composite parent) {
 		super.createControls(parent);
@@ -38,35 +37,20 @@ public class WizardDefaultsTab extends AbstractCPropertyTab {
         show_oth.setText(Messages.getString("WizardDefaultsTab.1")); //$NON-NLS-1$
         show_oth.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 
-        Label l = new Label(usercomp, SWT.WRAP);
+		show_sup.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSUPP));
-        l.setText("\n This checkbox will be moved to another page soon"); //$NON-NLS-1$
-        l.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
-        
-        show_mng = new Button(usercomp, SWT.CHECK);
-        show_mng.setText(Messages.getString("WizardDefaultsTab.2")); //$NON-NLS-1$
-        show_mng.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
-
-		show_sup.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_UNSUPP));
 		show_oth.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_OTHERS));
-		show_mng.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_MANAGE));
 	}
 
 	protected void performOK() {
-		CDTPrefUtil.setBool(CDTPrefUtil.KEY_UNSUPP, !show_sup.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOSUPP, !show_sup.getSelection());
 		CDTPrefUtil.setBool(CDTPrefUtil.KEY_OTHERS, show_oth.getSelection());
-		CDTPrefUtil.setBool(CDTPrefUtil.KEY_MANAGE, show_mng.getSelection());
 	}
 	
-	protected void performApply(ICResourceDescription src, ICResourceDescription dst) { performOK(); }
-
 	protected void performDefaults() {
 		show_sup.setSelection(true);
 		show_oth.setSelection(false);
-		show_mng.setSelection(false);
-	}
-
-	protected void updateData(ICResourceDescription cfg) {
-        // Do nothing. Data is read once after creation
 	}
 
+	protected void performApply(ICResourceDescription src, ICResourceDescription dst) { performOK(); }
+	protected void updateData(ICResourceDescription cfg) {} // Do nothing. Data is read once after creation
 }

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/messages.properties

@@ -69,7 +69,6 @@ PrefPage_NewCDTWizard.0=Settings will be applied to CDT new project wizard
 PrefPage_NewCDTWizard.1=\nduring project creation process
 WizardDefaultsTab.0=Show only supported toolchains, by default
 WizardDefaultsTab.1=Group old-style toolchains to <Others> folder
-WizardDefaultsTab.2=Show <Manage> button on property pages
 PreferredToolchainsTab.0=Preferred toolchain will be selected by default in Wizard
 PreferredToolchainsTab.1=Make toolhain(s) preferred
 PreferredToolchainsTab.2=Make toolhain(s) unpreferred

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/wizards/CConfigWizardPage.java

@@ -281,13 +281,13 @@ public class CConfigWizardPage extends MBSCustomPage {
 			NewModelProjectWizard nmWizard = (NewModelProjectWizard)wizard;
 			IProject newProject = nmWizard.getProject(true);
 			if (newProject != null) {
-				boolean oldManage = CDTPrefUtil.getBool(CDTPrefUtil.KEY_MANAGE);
+				boolean oldManage = CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOMNG);
 				// disable manage configurations button
-				CDTPrefUtil.setBool(CDTPrefUtil.KEY_MANAGE, false);
+				CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOMNG, true);
 				try {
 					PreferencesUtil.createPropertyDialogOn(wizard.getContainer().getShell(), newProject, propertyId, null, null).open();
 				} finally {
-					CDTPrefUtil.setBool(CDTPrefUtil.KEY_MANAGE, oldManage);
+					CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOMNG, oldManage);
 				}
 			}
 		}

build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/wizards/CMainWizardPage.java

@@ -171,7 +171,7 @@ import org.eclipse.ui.internal.ide.dialogs.ProjectContentsLocationArea.IErrorMes
 				}} );
 
 	        // restore settings from preferences
-			show_sup.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_UNSUPP));
+			show_sup.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSUPP));
 	    }
 	    
 	    /**

core/org.eclipse.cdt.ui/plugin.properties

@@ -361,6 +361,7 @@ indexerPrefName=Indexer
 
 varsPrefName=CDT build variables
 envPrefName=Environment 
+propSettingsPrefName=Property Pages settings 
 
 # indexer names
 CDTIndexer.domsourceindexer=Full C/C++ Indexer (complete parse)

core/org.eclipse.cdt.ui/plugin.xml

@@ -695,6 +695,11 @@
             class="org.eclipse.cdt.ui.newui.PrefPage_Vars"
             id="org.eclipse.cdt.ui.preferences.VariablesPrefPage"
             name="%varsPrefName"/>
+      <page
+            category="org.eclipse.cdt.ui.preferences.CPluginPreferencePage"
+            class="org.eclipse.cdt.ui.newui.PrefPage_PropertyPage"
+            id="org.eclipse.cdt.ui.preferences.PropertyPageSettings"
+            name="%propSettingsPrefName"/>
       <!--page
             name="%WorkInProgress.name"
             category="org.eclipse.cdt.ui.preferences.CPluginPreferencePage"

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

@@ -101,9 +101,6 @@ implements
 		IPreferencePageContainer, // dynamic pages
 		ICPropertyProvider // utility methods for tabs
 {
-	// All(Multiple) configuration support is now disabled 
-	private static final boolean ENABLE_MULTI_CFG = false;
-
 	private static ArrayList pages = new ArrayList(5);
 	private static ICResourceDescription resd = null;
 	private static ICConfigurationDescription[] cfgDescs = null;
@@ -111,7 +108,6 @@ implements
 	private static ICProjectDescription prjd = null;
 	private static int cfgIndex = 0;
 	protected static boolean saveDone  = false;
-//	private static boolean doneOK = false;
 	// tabs
 	private static final String EXTENSION_POINT_ID = "org.eclipse.cdt.ui.cPropertyTab"; //$NON-NLS-1$
 	public static final String ELEMENT_NAME = "tab"; //$NON-NLS-1$
@@ -252,7 +248,7 @@ implements
 	  	
 		configSelector.setLayoutData(gd);
 		
-		if (CDTPrefUtil.getBool(CDTPrefUtil.KEY_MANAGE)) {
+		if (!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOMNG)) {
 			manageButton = new Button(configGroup, SWT.PUSH);
 			manageButton.setText(UIMessages.getString("AbstractPage.12")); //$NON-NLS-1$
 			gd = new GridData(GridData.END);
@@ -471,7 +467,7 @@ implements
 			if (cfgDescs[i].isActive()) cfgIndex = i;
 		}
 		// Handling of All/Multiple configurations can be disabled
-		if (ENABLE_MULTI_CFG) {
+		if (CDTPrefUtil.getBool(CDTPrefUtil.KEY_MULTI)) {
 			if (cfgDescs.length > 1) // "All cfgs" - shown if at least 2 cfgs available
 				configSelector.add(UIMessages.getString("AbstractPage.4")); //$NON-NLS-1$
 			if (cfgDescs.length > 2)// "Multi cfgs" - shown if at least 3 cfgs available
@@ -508,6 +504,8 @@ implements
 	
 	protected void handleResize(boolean visible) {
 		if (pages.size() > 1) return; // do not duplicate
+		if (CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSAVE)) return;
+		
 		IProject prj = getProject();
 		if (prj == null) return; // preferences. Do not process. 
 		QualifiedName WIDTH  = new QualifiedName(prj.getName(),".property.page.width"); //$NON-NLS-1$

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

@@ -19,10 +19,15 @@ import org.eclipse.cdt.ui.CUIPlugin;
 import org.eclipse.jface.preference.IPreferenceStore;
 
 public class CDTPrefUtil {
-	public static final String KEY_UNSUPP  = "wizard.default.show.unsupported";  //$NON-NLS-1$
+	// boolean keys (KEY_NO-s are to be inverted !)
-	public static final String KEY_OTHERS  = "wizard.default.group.others";  //$NON-NLS-1$
+	public static final String KEY_NOSUPP  = "wizard.show.unsupported.disable";  //$NON-NLS-1$
+	public static final String KEY_OTHERS  = "wizard.group.others.enable";  //$NON-NLS-1$
+	public static final String KEY_NOMNG  = "properties.manage.config.disable"; //$NON-NLS-1$
+	public static final String KEY_MULTI  = "properties.multi.config.enable"; //$NON-NLS-1$
+	public static final String KEY_DTREE  = "properties.data.hierarchy.enable"; //$NON-NLS-1$
+	public static final String KEY_NOSAVE  = "properties.save.position.disable"; //$NON-NLS-1$
+	// string keys
 	public static final String KEY_PREFTC  = "wizard.preferred.toolchains";  //$NON-NLS-1$
-	public static final String KEY_MANAGE  = "properties.manage.config.button"; //$NON-NLS-1$
 
 	public static final String NULL = "NULL"; //$NON-NLS-1$
 	private static final IPreferenceStore pref = CUIPlugin.getDefault().getPreferenceStore();

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

@@ -336,6 +336,10 @@ ProjectConvert.noConverterErrordialog.title=Project Conversion Error
 ProjectConvert.noConverterErrordialog.message=There are no converters available to convert the project {0} .
 
 ProjectConvert.title=Project Converters for {0}
+PropertyPageDefsTab.0=Show <Manage configurations> button
+PropertyPageDefsTab.1=Display <Data hierarchy> tab
+PropertyPageDefsTab.2=Enable multiple configurations setting
+PropertyPageDefsTab.3=Save property dialog size and position
 ProjectConvert.convertersList=Converters List
 			        
 ScannerConfigOptionsDialog.title=Discovery Options
@@ -484,3 +488,4 @@ StructureTreeTab.8=Property
 StructureTreeTab.9=Value
 StructureTreeTab.10=Class
 StructureTreeTab.11=Wait...
+PrefPage_PropertyPage.0=These settings will affect behaviour of CDT property pages

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

@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.cdt.ui.newui;
+
+import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+import org.eclipse.cdt.ui.newui.AbstractPrefPage;
+import org.eclipse.cdt.ui.newui.ICPropertyTab;
+
+public class PrefPage_PropertyPage extends AbstractPrefPage {
+
+	protected String getHeader() {
+		return UIMessages.getString("PrefPage_PropertyPage.0"); //$NON-NLS-1$
+	}
+
+	/*
+	 * All affected settings are stored in preferences.
+	 * Tabs are responsible for saving, after OK signal.
+	 * No need to affect Project Description somehow.
+	 */
+	public boolean performOk() {
+		forEach(ICPropertyTab.OK, null);
+		return true;
+	}
+	public ICResourceDescription getResDesc() { return null; } 
+	protected boolean isSingle() { return true; }
+
+}

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

@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Intel Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.ui.newui;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Composite;
+
+import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+
+public class PropertyPageDefsTab extends AbstractCPropertyTab {
+
+    private Button show_tree;
+    private Button show_mul;
+    private Button show_mng;
+    private Button show_sav;
+
+	public void createControls(Composite parent) {
+		super.createControls(parent);
+		usercomp.setLayout(new GridLayout(1, false));
+
+        show_mng = new Button(usercomp, SWT.CHECK);
+        show_mng.setText(UIMessages.getString("PropertyPageDefsTab.0")); //$NON-NLS-1$
+        show_mng.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+
+		show_tree = new Button(usercomp, SWT.CHECK);
+        show_tree.setText(UIMessages.getString("PropertyPageDefsTab.1")); //$NON-NLS-1$
+        show_tree.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+
+		show_mul = new Button(usercomp, SWT.CHECK);
+        show_mul.setText(UIMessages.getString("PropertyPageDefsTab.2")); //$NON-NLS-1$
+        show_mul.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+
+		show_sav = new Button(usercomp, SWT.CHECK);
+        show_sav.setText(UIMessages.getString("PropertyPageDefsTab.3")); //$NON-NLS-1$
+        show_sav.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+
+        show_tree.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_DTREE));
+		show_mul.setSelection(CDTPrefUtil.getBool(CDTPrefUtil.KEY_MULTI));
+		show_mng.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOMNG));
+		show_sav.setSelection(!CDTPrefUtil.getBool(CDTPrefUtil.KEY_NOSAVE));
+		
+		show_mul.setEnabled(false);
+	}
+
+	protected void performOK() {
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_DTREE, show_tree.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_MULTI, show_mul.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOMNG, !show_mng.getSelection());
+		CDTPrefUtil.setBool(CDTPrefUtil.KEY_NOSAVE, !show_sav.getSelection());
+	}
+	protected void performDefaults() {
+		show_tree.setSelection(false);
+		show_mul.setSelection(false);
+		show_mng.setSelection(true);
+		show_mng.setSelection(true);
+	}
+
+	protected void performApply(ICResourceDescription src, ICResourceDescription dst) { performOK(); }
+	protected void updateData(ICResourceDescription cfg) {}  // Do nothing. Data is read once after creation
+}

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

@@ -776,4 +776,9 @@ public class StructureTreeTab  extends AbstractCPropertyTab {
 			}
 		});
 	}
+	
+	// This page can be displayed if it's permitted in prefs
+	public boolean canBeVisible() {
+		return CDTPrefUtil.getBool(CDTPrefUtil.KEY_DTREE);
+	}
 }