X-Git-Url: https://git.argeo.org/?p=gpl%2Fargeo-suite.git;a=blobdiff_plain;f=org.argeo.app.ui%2Fsrc%2Forg%2Fargeo%2Fapp%2Fui%2Fwidgets%2FConnectAbstractDropDown.java;fp=org.argeo.app.ui%2Fsrc%2Forg%2Fargeo%2Fapp%2Fui%2Fwidgets%2FConnectAbstractDropDown.java;h=d1f1a2921a62acb0dd09d56e285c2de412d862c9;hp=0000000000000000000000000000000000000000;hb=6e56ffa34cb02ab04d028423aea342e3dfed4358;hpb=c285180bece610b2c2921d44fe14b6dde2123efa

diff --git a/org.argeo.app.ui/src/org/argeo/app/ui/widgets/ConnectAbstractDropDown.java b/org.argeo.app.ui/src/org/argeo/app/ui/widgets/ConnectAbstractDropDown.java
new file mode 100644
index 0000000..d1f1a29
--- /dev/null
+++ b/org.argeo.app.ui/src/org/argeo/app/ui/widgets/ConnectAbstractDropDown.java
@@ -0,0 +1,194 @@
+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);
+				}
+			}
+		});
+	}
+}