--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/PopUpHelper.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,216 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM 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:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.draw2d.PopUpHelper;
+
+import dwt.dwthelper.utils;
+
+
+
+import dwt.DWT;
+import dwt.graphics.Color;
+import dwt.graphics.Rectangle;
+import dwt.widgets.Control;
+import dwt.widgets.Shell;
+import dwtx.draw2d.geometry.Dimension;
+import dwtx.draw2d.LightweightSystem;
+
+/**
+ * Provides abstract support for classes that manage popups. Popups in Draw2d consist of a
+ * LightweightSystem object with an DWT shell as its Control. Desired popup behavior is
+ * attained by adding appropriate listeners to this shell.
+ */
+public abstract class PopUpHelper {
+
+private Shell shell;
+private LightweightSystem lws;
+private bool tipShowing;
+/**
+ * The Control this PopUpHelper's tooltip will belong to.
+ */
+protected Control control;
+
+/**
+ * These style bits should be used when creating the Shell.
+ * @see #createShell()
+ */
+protected const int shellStyle;
+
+/**
+ * Constructs a PopUpHelper to assist with popups on Control c.
+ *
+ * @param c the Control
+ * @since 2.0
+ */
+protected this(Control c) {
+    this (c, DWT.ON_TOP | DWT.NO_TRIM);
+}
+
+/**
+ * Constructs a PopUpHelper to display the given shell style popup.
+ * @param c the control on which the popup is active.
+ * @param shellStyle the DWT style bits for the shell
+ * @since 3.1
+ */
+protected this(Control c, int shellStyle) {
+    control = c;
+    this.shellStyle = shellStyle | DWT.NO_BACKGROUND | DWT.NO_REDRAW_RESIZE;
+}
+
+/**
+ * Creates and returns the LightweightSystem object used by PopUpHelper to draw upon.
+ *
+ * @return the newly created LightweightSystem
+ * @since 2.0
+ */
+protected LightweightSystem createLightweightSystem() {
+    return new LightweightSystem();
+}
+
+/**
+ * Creates a new Shell object with the style specified for this helper.
+ *
+ * @return the newly created Shell
+ * @since 2.0
+ */
+protected Shell createShell() {
+    return new Shell(control.getShell(), shellStyle);
+}
+
+/**
+ * Dispose of this PopUpHelper object.
+ *
+ * @since 2.0
+ */
+public void dispose() {
+    if (isShowing())
+        hide();
+    if (shell !is null && !shell.isDisposed())
+        shell.dispose();
+}
+
+/**
+ * Returns this PopUpHelper's shell. If no shell exists for this PopUpHelper, a new shell
+ * is created and hookShellListeners() is called.
+ *
+ * @return the Shell
+ * @since 2.0
+ */
+protected Shell getShell() {
+    if (shell is null) {
+        shell = createShell();
+        hookShellListeners();
+    }
+    return shell;
+}
+
+/**
+ * Returns the size needed to display the shell's trim.  This method should not be called
+ * until the shell has been created.
+ * @return the size of the shells trim.
+ * @since 3.1
+ */
+protected Dimension getShellTrimSize() {
+    Rectangle trim = shell.computeTrim(0, 0, 0, 0);
+    return new Dimension(trim.width, trim.height);
+}
+
+/**
+ * Returns this PopUpHelper's LightweightSystem. If no LightweightSystem exists for this
+ * PopUpHelper, a new LightweightSystem is created with this PopUpHelper's Shell as its
+ * Control.
+ *
+ * @return the LightweightSystem
+ * @since 2.0
+ */
+protected LightweightSystem getLightweightSystem() {
+    if (lws is null) {
+        lws = createLightweightSystem();
+        lws.setControl(getShell());
+    }
+    return lws;
+}
+
+/**
+ * Hides this PopUpHelper's Shell.
+ *
+ * @since 2.0
+ */
+protected void hide() {
+    if (shell !is null && !shell.isDisposed())
+        shell.setVisible(false);
+    tipShowing = false;
+}
+
+/**
+ * Desired popup helper behavior is achieved by writing listeners that manipulate the
+ * behavior of the PopUpHelper's Shell. Override this method and add these listeners here.
+ *
+ * @since 2.0
+ */
+protected abstract void hookShellListeners();
+
+/**
+ * Returns <code>true</code> if this PopUpHelper's Shell is visible, <code>false</code>
+ * otherwise.
+ *
+ * @return <code>true</code> if this PopUpHelper's Shell is visible
+ * @since 2.0
+ */
+public bool isShowing() {
+    return tipShowing;
+}
+
+/**
+ * Sets the background color of this PopUpHelper's Shell.
+ *
+ * @param c the new background color
+ * @since 2.0
+ */
+public void setBackgroundColor(Color c) {
+    getShell().setBackground(c);
+}
+
+/**
+ * Sets the foreground color of this PopUpHelper's Shell.
+ *
+ * @param c the new foreground color
+ * @since 2.0
+ */
+public void setForegroundColor(Color c) {
+    getShell().setForeground(c);
+}
+
+/**
+ * Sets the bounds on this PopUpHelper's Shell.
+ *
+ * @param x the x coordinate
+ * @param y the y coordinate
+ * @param width the width
+ * @param height the height
+ * @since 2.0
+ */
+protected void setShellBounds(int x, int y, int width, int height) {
+    getShell().setBounds(x, y, width, height);
+}
+
+/**
+ * Displays this PopUpHelper's Shell.
+ *
+ * @since 2.0
+ */
+protected void show() {
+    getShell().setVisible(true);
+    tipShowing = true;
+}
+
+}