package org.erlide.ui.prefs;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.nullValue;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StackLayout;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.erlide.ui.editors.erl.folding.IErlangFoldingPreferenceBlock;
import org.erlide.ui.internal.ErlideUIPlugin;
import org.erlide.ui.internal.folding.ErlangFoldingStructureProviderDescriptor;
import org.erlide.ui.internal.folding.ErlangFoldingStructureProviderRegistry;
import org.erlide.ui.prefs.plugin.PreferencesMessages;
import org.erlide.ui.util.OverlayPreferenceStore;
import org.erlide.ui.util.PixelConverter;
public class FoldingConfigurationBlock implements IPreferenceConfigurationBlock {
private static class ErrorPreferences implements IErlangFoldingPreferenceBlock {
private final String fMessage;
protected ErrorPreferences(final String message) {
fMessage = message;
}
/*
* @see
* org.eclipse.jdt.internal.ui.text.folding.IErlangFoldingPreferences#
* createControl(org.eclipse.swt.widgets.Group)
*/
@Override
public Control createControl(final Composite composite) {
final Composite inner = new Composite(composite, SWT.NONE);
inner.setLayout(new FillLayout(SWT.VERTICAL));
final Label label = new Label(inner, SWT.CENTER);
label.setText(fMessage);
return inner;
}
@Override
public void initialize() {
}
@Override
public void performOk() {
}
@Override
public void performDefaults() {
}
@Override
public void dispose() {
}
}
/** The overlay preference store. */
final OverlayPreferenceStore fStore;
/* The controls */
private Combo fProviderCombo;
Button fFoldingCheckbox;
private ComboViewer fProviderViewer;
private Composite fGroup;
private StackLayout fStackLayout;
/* the model */
final Map<String, ErlangFoldingStructureProviderDescriptor> fProviderDescriptors;
private final Map<String, IErlangFoldingPreferenceBlock> fProviderPreferences;
private final Map<String, Control> fProviderControls;
public FoldingConfigurationBlock(final OverlayPreferenceStore store) {
assertThat(store, is(not(nullValue())));
fStore = store;
fStore.addKeys(createOverlayStoreKeys());
fProviderDescriptors = createListModel();
fProviderPreferences = new HashMap<String, IErlangFoldingPreferenceBlock>();
fProviderControls = new HashMap<String, Control>();
}
private Map<String, ErlangFoldingStructureProviderDescriptor> createListModel() {
final ErlangFoldingStructureProviderRegistry reg = ErlideUIPlugin.getDefault()
.getFoldingStructureProviderRegistry();
reg.reloadExtensions();
final ErlangFoldingStructureProviderDescriptor[] descs = reg
.getFoldingProviderDescriptors();
final Map<String, ErlangFoldingStructureProviderDescriptor> map = new HashMap<String, ErlangFoldingStructureProviderDescriptor>();
for (final ErlangFoldingStructureProviderDescriptor element : descs) {
map.put(element.getId(), element);
}
return map;
}
private OverlayPreferenceStore.OverlayKey[] createOverlayStoreKeys() {
final ArrayList<OverlayPreferenceStore.OverlayKey> overlayKeys = new ArrayList<OverlayPreferenceStore.OverlayKey>();
overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
OverlayPreferenceStore.TypeDescriptor.BOOLEAN,
PreferenceConstants.EDITOR_FOLDING_ENABLED));
overlayKeys.add(new OverlayPreferenceStore.OverlayKey(
OverlayPreferenceStore.TypeDescriptor.STRING,
PreferenceConstants.EDITOR_FOLDING_PROVIDER));
return overlayKeys.toArray(new OverlayPreferenceStore.OverlayKey[overlayKeys
.size()]);
}
/**
* Creates page for folding preferences.
*
* @param parent
* the parent composite
* @return the control for the preference page
*/
@Override
public Control createControl(final Composite parent) {
final Composite composite = new Composite(parent, SWT.NULL);
// assume parent page uses griddata
GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_CENTER
| GridData.VERTICAL_ALIGN_FILL);
composite.setLayoutData(gd);
final GridLayout layout = new GridLayout();
layout.numColumns = 2;
final PixelConverter pc = new PixelConverter(composite);
layout.verticalSpacing = pc.convertHeightInCharsToPixels(1) / 2;
composite.setLayout(layout);
/* check box for new editors */
fFoldingCheckbox = new Button(composite, SWT.CHECK);
fFoldingCheckbox.setText(PreferencesMessages.FoldingConfigurationBlock_enable);
gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING
| GridData.VERTICAL_ALIGN_BEGINNING);
fFoldingCheckbox.setLayoutData(gd);
fFoldingCheckbox.addSelectionListener(new SelectionListener() {
@Override
public void widgetSelected(final SelectionEvent e) {
final boolean enabled = fFoldingCheckbox.getSelection();
fStore.setValue(PreferenceConstants.EDITOR_FOLDING_ENABLED, enabled);
updateCheckboxDependencies();
}
@Override
public void widgetDefaultSelected(final SelectionEvent e) {
}
});
Label label = new Label(composite, SWT.CENTER);
gd = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_BEGINNING);
label.setLayoutData(gd);
if (fProviderDescriptors.size() > 1) {
/* list */
final Composite comboComp = new Composite(composite, SWT.NONE);
gd = new GridData(GridData.FILL_HORIZONTAL
| GridData.VERTICAL_ALIGN_BEGINNING);
final GridLayout gridLayout = new GridLayout(2, false);
gridLayout.marginWidth = 0;
comboComp.setLayout(gridLayout);
final Label comboLabel = new Label(comboComp, SWT.CENTER);
gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING
| GridData.VERTICAL_ALIGN_CENTER);
comboLabel.setLayoutData(gd);
comboLabel
.setText(PreferencesMessages.FoldingConfigurationBlock_combo_caption);
label = new Label(composite, SWT.CENTER);
gd = new GridData(GridData.FILL_HORIZONTAL
| GridData.VERTICAL_ALIGN_BEGINNING);
label.setLayoutData(gd);
fProviderCombo = new Combo(comboComp, SWT.READ_ONLY | SWT.DROP_DOWN);
gd = new GridData(GridData.HORIZONTAL_ALIGN_END
| GridData.VERTICAL_ALIGN_CENTER);
fProviderCombo.setLayoutData(gd);
fProviderViewer = createProviderViewer();
}
final Composite groupComp = new Composite(composite, SWT.NONE);
gd = new GridData(GridData.FILL_BOTH);
gd.horizontalSpan = 2;
groupComp.setLayoutData(gd);
final GridLayout gridLayout = new GridLayout(1, false);
gridLayout.marginWidth = 0;
groupComp.setLayout(gridLayout);
/* contributed provider preferences. */
fGroup = new Composite(groupComp, SWT.NONE);
gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING
| GridData.VERTICAL_ALIGN_BEGINNING);
fGroup.setLayoutData(gd);
fStackLayout = new StackLayout();
fGroup.setLayout(fStackLayout);
return composite;
}
private ComboViewer createProviderViewer() {
/* list viewer */
final ComboViewer viewer = new ComboViewer(fProviderCombo);
viewer.setContentProvider(new IStructuredContentProvider() {
/*
* @see org.eclipse.jface.viewers.IContentProvider#dispose()
*/
@Override
public void dispose() {
}
/*
* @see
* org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse
* .jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
@Override
public void inputChanged(final Viewer v, final Object oldInput,
final Object newInput) {
}
/*
* @see
* org.eclipse.jface.viewers.IStructuredContentProvider#getElements
* (java.lang.Object)
*/
@Override
public Object[] getElements(final Object inputElement) {
return fProviderDescriptors.values().toArray();
}
});
viewer.setLabelProvider(new LabelProvider() {
/*
* @see
* org.eclipse.jface.viewers.LabelProvider#getImage(java.lang.Object
* )
*/
@Override
public Image getImage(final Object element) {
return null;
}
/*
* @see
* org.eclipse.jface.viewers.LabelProvider#getText(java.lang.Object)
*/
@Override
public String getText(final Object element) {
return ((ErlangFoldingStructureProviderDescriptor) element).getName();
}
});
viewer.addSelectionChangedListener(new ISelectionChangedListener() {
@Override
public void selectionChanged(final SelectionChangedEvent event) {
final IStructuredSelection sel = (IStructuredSelection) event
.getSelection();
if (!sel.isEmpty()) {
fStore.setValue(PreferenceConstants.EDITOR_FOLDING_PROVIDER,
((ErlangFoldingStructureProviderDescriptor) sel
.getFirstElement()).getId());
updateListDependencies();
}
}
});
viewer.setInput(fProviderDescriptors);
viewer.refresh();
return viewer;
}
void updateCheckboxDependencies() {
}
void updateListDependencies() {
final String id = fStore.getString(PreferenceConstants.EDITOR_FOLDING_PROVIDER);
final ErlangFoldingStructureProviderDescriptor desc = fProviderDescriptors
.get(id);
IErlangFoldingPreferenceBlock prefs;
if (desc == null) {
// safety in case there is no such descriptor
final String message = PreferencesMessages.FoldingConfigurationBlock_error_not_exist;
ErlideUIPlugin.log(new Status(IStatus.WARNING, ErlideUIPlugin.PLUGIN_ID,
IStatus.OK, message, null));
prefs = new ErrorPreferences(message);
} else {
prefs = fProviderPreferences.get(id);
if (prefs == null) {
try {
prefs = desc.createPreferences();
fProviderPreferences.put(id, prefs);
} catch (final CoreException e) {
ErlideUIPlugin.log(e);
prefs = new ErrorPreferences(e.getLocalizedMessage());
}
}
}
Control control = fProviderControls.get(id);
if (control == null) {
control = prefs.createControl(fGroup);
if (control == null) {
final String message = PreferencesMessages.FoldingConfigurationBlock_info_no_preferences;
control = new ErrorPreferences(message).createControl(fGroup);
} else {
fProviderControls.put(id, control);
}
}
Dialog.applyDialogFont(control);
fStackLayout.topControl = control;
control.pack();
fGroup.layout();
fGroup.getParent().layout();
prefs.initialize();
}
@Override
public void initialize() {
restoreFromPreferences();
}
@Override
public void performOk() {
for (final Object element : fProviderPreferences.values()) {
final IErlangFoldingPreferenceBlock prefs = (IErlangFoldingPreferenceBlock) element;
prefs.performOk();
}
}
@Override
public void performDefaults() {
restoreFromPreferences();
for (final Object element : fProviderPreferences.values()) {
final IErlangFoldingPreferenceBlock prefs = (IErlangFoldingPreferenceBlock) element;
prefs.performDefaults();
}
}
@Override
public void dispose() {
for (final Object element : fProviderPreferences.values()) {
final IErlangFoldingPreferenceBlock prefs = (IErlangFoldingPreferenceBlock) element;
prefs.dispose();
}
}
private void restoreFromPreferences() {
final boolean enabled = fStore
.getBoolean(PreferenceConstants.EDITOR_FOLDING_ENABLED);
fFoldingCheckbox.setSelection(enabled);
updateCheckboxDependencies();
final String id = fStore.getString(PreferenceConstants.EDITOR_FOLDING_PROVIDER);
final Object provider = fProviderDescriptors.get(id);
if (provider != null) {
if (fProviderViewer == null) {
updateListDependencies();
} else {
fProviderViewer.setSelection(new StructuredSelection(provider), true);
}
}
}
}