+package org.argeo.app.ui.widgets;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.argeo.cms.swt.CmsSwtUtils;
+import org.argeo.eclipse.ui.EclipseUiUtils;
+import org.eclipse.rap.rwt.widgets.DropDown;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.FocusEvent;
+import org.eclipse.swt.events.FocusListener;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.swt.widgets.Listener;
+import org.eclipse.swt.widgets.Text;
+import org.eclipse.swt.widgets.Widget;
+
+/**
+ * Enable easy addition of a {@code DropDown} widget to a text with listeners
+ * configured
+ */
+public abstract class ConnectAbstractDropDown {
+
+ private final Text text;
+ private final DropDown dropDown;
+ private boolean modifyFromList = false;
+
+ // Current displayed text
+ private String userText = "";
+ // Current displayed list items
+ private String[] values;
+
+ // Fine tuning
+ boolean readOnly;
+ boolean refreshOnFocus;
+
+ /** Implementing classes should call refreshValues() after initialisation */
+ public ConnectAbstractDropDown(Text text) {
+ this(text, SWT.NONE, false);
+ }
+
+ /**
+ * Implementing classes should call refreshValues() after initialisation
+ *
+ * @param text
+ * @param style
+ * only SWT.READ_ONLY is understood, check if the entered text is
+ * part of the legal choices.
+ */
+ public ConnectAbstractDropDown(Text text, int style) {
+ this(text, style, false);
+ }
+
+ /**
+ * Implementers should call refreshValues() once init has been done.
+ *
+ * @param text
+ * @param style
+ * only SWT.READ_ONLY is understood, check if the entered text is
+ * part of the legal choices.
+ * @param refreshOnFocus
+ * if true, the possible values are computed each time the focus is
+ * gained. It enables, among other to fine tune the getFilteredValues
+ * method depending on the current context
+ */
+ public ConnectAbstractDropDown(Text text, int style, boolean refreshOnFocus) {
+ this.text = text;
+ dropDown = new DropDown(text);
+ Object obj = dropDown;
+ if (obj instanceof Widget)
+ CmsSwtUtils.markup((Widget) obj);
+ readOnly = (style & SWT.READ_ONLY) != 0;
+ this.refreshOnFocus = refreshOnFocus;
+ addListeners();
+ }
+
+ /**
+ * Overwrite to force the refresh of the possible values on focus gained event
+ */
+ protected boolean refreshOnFocus() {
+ return refreshOnFocus;
+ }
+
+ public String getText() {
+ return text.getText();
+ }
+
+ public void init() {
+ refreshValues();
+ }
+
+ public void reset(String value) {
+ modifyFromList = true;
+ if (EclipseUiUtils.notEmpty(value))
+ text.setText(value);
+ else
+ text.setText("");
+ refreshValues();
+ modifyFromList = false;
+ }
+
+ /** Overwrite to provide specific filtering */
+ protected abstract List<String> getFilteredValues(String filter);
+
+ protected void refreshValues() {
+ List<String> filteredValues = getFilteredValues(text.getText());
+ values = filteredValues.toArray(new String[filteredValues.size()]);
+ dropDown.setItems(values);
+ }
+
+ protected void addListeners() {
+ addModifyListener();
+ addSelectionListener();
+ addDefaultSelectionListener();
+ addFocusListener();
+ }
+
+ protected void addFocusListener() {
+ text.addFocusListener(new FocusListener() {
+ private static final long serialVersionUID = -7179112097626535946L;
+
+ public void focusGained(FocusEvent event) {
+ if (refreshOnFocus) {
+ modifyFromList = true;
+ refreshValues();
+ modifyFromList = false;
+ }
+ dropDown.setVisible(true);
+ }
+
+ public void focusLost(FocusEvent event) {
+ dropDown.setVisible(false);
+ if (readOnly && values != null && !Arrays.asList(values).contains(userText)) {
+ modifyFromList = true;
+ text.setText("");
+ refreshValues();
+ modifyFromList = false;
+ }
+ }
+ });
+ }
+
+ private void addSelectionListener() {
+ Object obj = dropDown;
+ if (obj instanceof Widget)
+ ((Widget) obj).addListener(SWT.Selection, new Listener() {
+ private static final long serialVersionUID = -2357157809365135142L;
+
+ public void handleEvent(Event event) {
+ if (event.index != -1) {
+ modifyFromList = true;
+ text.setText(values[event.index]);
+ modifyFromList = false;
+ text.selectAll();
+ } else {
+ text.setText(userText);
+ text.setSelection(userText.length(), userText.length());
+ text.setFocus();
+ }
+ }
+ });
+ }
+
+ private void addDefaultSelectionListener() {
+ Object obj = dropDown;
+ if (obj instanceof Widget)
+ ((Widget) obj).addListener(SWT.DefaultSelection, new Listener() {
+ private static final long serialVersionUID = -5958008322630466068L;
+
+ public void handleEvent(Event event) {
+ if (event.index != -1) {
+ text.setText(values[event.index]);
+ text.setSelection(event.text.length());
+ dropDown.setVisible(false);
+ }
+ }
+ });
+ }
+
+ private void addModifyListener() {
+ text.addListener(SWT.Modify, new Listener() {
+ private static final long serialVersionUID = -4373972835244263346L;
+
+ public void handleEvent(Event event) {
+ if (!modifyFromList) {
+ userText = text.getText();
+ refreshValues();
+ if (values.length == 1)
+ dropDown.setSelectionIndex(0);
+ dropDown.setVisible(true);
+ }
+ }
+ });
+ }
+}
projects / gpl / argeo-suite.git / blobdiff