--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/ExpandItem.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,395 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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
+ *******************************************************************************/
+module dwt.widgets.ExpandItem;
+
+import dwt.dwthelper.utils;
+
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.graphics.GC;
+import dwt.graphics.Image;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+
+/**
+ * Instances of this class represent a selectable user interface object
+ * that represents a expandable item in a expand bar.
+ * <p>
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>(none)</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>(none)</dd>
+ * </dl>
+ * </p><p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ * 
+ * @see ExpandBar
+ * 
+ * @since 3.2
+ */
+public class ExpandItem extends Item {
+    ExpandBar parent;
+    Control control;
+    bool expanded;
+    int x, y, width, height;
+    int imageHeight, imageWidth;
+    static final int TEXT_INSET = 6;
+    static final int BORDER = 1;
+    static final int CHEVRON_SIZE = 24;
+
+/**
+ * Constructs a new instance of this class given its parent
+ * and a style value describing its behavior and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>DWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together 
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>DWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public ExpandItem (ExpandBar parent, int style) {
+    this (parent, style, checkNull (parent).getItemCount ());
+}
+
+/**
+ * Constructs a new instance of this class given its parent, a
+ * style value describing its behavior and appearance, and the index
+ * at which to place it in the items maintained by its parent.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>DWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together 
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>DWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ * @param index the zero-relative index to store the receiver in its parent
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public ExpandItem (ExpandBar parent, int style, int index) {
+    super (parent, style);
+    this.parent = parent;
+    parent.createItem (this, style, index);
+}
+
+static ExpandBar checkNull (ExpandBar control) {
+    if (control is null) DWT.error (DWT.ERROR_NULL_ARGUMENT);
+    return control; 
+}
+
+public void dispose () {
+    if (isDisposed ()) return;
+    //if (!isValidThread ()) error (DWT.ERROR_THREAD_INVALID_ACCESS);
+    parent.destroyItem (this);
+    super.dispose();
+    parent = null;
+    control = null;
+}
+
+void drawChevron (GC gc, int x, int y) {
+    int [] polyline1, polyline2;
+    if (expanded) {
+        int px = x + 4 + 5;
+        int py = y + 4 + 7;
+        polyline1 = new int [] {
+                px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
+                px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py};
+        py += 4;
+        polyline2 = new int [] {
+                px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
+                px+3,py-2, px+4,py-2, px+4,py-1,  px+5,py-1, px+5,py, px+6,py};
+    } else {
+        int px = x + 4 + 5;
+        int py = y + 4 + 4;
+        polyline1 = new int[] {
+                px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
+                px+3,py+2, px+4,py+2, px+4,py+1,  px+5,py+1, px+5,py, px+6,py};
+        py += 4;
+        polyline2 = new int [] {
+                px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
+                px+3,py+2, px+4,py+2, px+4,py+1,  px+5,py+1, px+5,py, px+6,py};
+    }
+    gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_FOREGROUND));
+    gc.drawPolyline (polyline1);
+    gc.drawPolyline (polyline2);
+}
+
+void drawItem (GC gc, bool drawFocus) {
+    int headerHeight = parent.getBandHeight ();
+    Display display = getDisplay ();
+    gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND));
+    gc.setBackground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND_GRADIENT));
+    gc.fillGradientRectangle (x, y, width, headerHeight, true);
+    if (expanded) {
+        gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND_GRADIENT));
+        gc.drawLine (x, y + headerHeight, x, y + headerHeight + height - 1);
+        gc.drawLine (x, y + headerHeight + height - 1, x + width - 1, y + headerHeight + height - 1);
+        gc.drawLine (x + width - 1, y + headerHeight + height - 1, x + width - 1, y + headerHeight);
+    }
+    int drawX = x;
+    if (image !is null) {
+        drawX += ExpandItem.TEXT_INSET;
+        if (imageHeight > headerHeight) {
+            gc.drawImage (image, drawX, y + headerHeight - imageHeight);
+        } else {
+            gc.drawImage (image, drawX, y + (headerHeight - imageHeight) / 2);
+        }
+        drawX += imageWidth;
+    }
+    if (text.length() > 0) {
+        drawX += ExpandItem.TEXT_INSET;
+        Point size = gc.stringExtent (text);
+        gc.setForeground (parent.getForeground ());
+        gc.drawString (text, drawX, y + (headerHeight - size.y) / 2, true);
+    }
+    int chevronSize = ExpandItem.CHEVRON_SIZE;
+    drawChevron (gc, x + width - chevronSize, y + (headerHeight - chevronSize) / 2);
+    if (drawFocus) {
+        gc.drawFocus (x + 1, y + 1, width - 2, headerHeight - 2);
+    }
+}
+
+/**
+ * Returns the control that is shown when the item is expanded.
+ * If no control has been set, return <code>null</code>.
+ *
+ * @return the control
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Control getControl() {
+    checkWidget ();
+    return control;
+}
+
+/**
+ * Returns <code>true</code> if the receiver is expanded,
+ * and false otherwise.
+ *
+ * @return the expanded state
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public bool getExpanded() {
+    checkWidget ();
+    return expanded;
+}
+
+/**
+ * Returns the height of the receiver's header 
+ *
+ * @return the height of the header 
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getHeaderHeight () {
+    checkWidget ();
+    return Math.max (parent.getBandHeight (), imageHeight);
+}
+
+/**
+ * Gets the height of the receiver.
+ *
+ * @return the height
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getHeight () {
+    checkWidget ();
+    return height;
+}
+
+/**
+ * Returns the receiver's parent, which must be a <code>ExpandBar</code>.
+ *
+ * @return the receiver's parent
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public ExpandBar getParent () {
+    checkWidget ();
+    return parent;
+}
+
+int getPreferredWidth (GC gc) {
+    int width = ExpandItem.TEXT_INSET * 2 + ExpandItem.CHEVRON_SIZE;
+    if (image !is null) {
+        width += ExpandItem.TEXT_INSET + imageWidth;
+    }
+    if (text.length() > 0) {
+        width += gc.stringExtent (text).x;
+    }
+    return width;
+}
+
+void redraw () {
+    int headerHeight = parent.getBandHeight ();
+    if (imageHeight > headerHeight) {
+        parent.redraw (x + ExpandItem.TEXT_INSET, y + headerHeight - imageHeight, imageWidth, imageHeight, false);
+    }
+    parent.redraw (x, y, width, headerHeight + height, false);
+}
+
+void setBounds (int x, int y, int width, int height, bool move, bool size) {
+    redraw ();
+    int headerHeight = parent.getBandHeight ();
+    if (move) {
+        if (imageHeight > headerHeight) {
+            y += (imageHeight - headerHeight);
+        }
+        this.x = x;
+        this.y = y;
+        redraw ();
+    }
+    if (size) {
+        this.width = width;
+        this.height = height;
+        redraw ();
+    }
+    if (control !is null && !control.isDisposed ()) {
+        if (move) control.setLocation (x + BORDER, y + headerHeight);
+        if (size) control.setSize (Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
+    }
+}
+
+/**
+ * Sets the control that is shown when the item is expanded.
+ *
+ * @param control the new control (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li> 
+ *    <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setControl(Control control) {
+    checkWidget ();
+    if (control !is null) {
+        if (control.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+        if (control.parent !is parent) error (DWT.ERROR_INVALID_PARENT);
+    }
+    this.control = control;
+    if (control !is null) {
+        control.setVisible (expanded);
+        int headerHeight = parent.getBandHeight ();
+        control.setBounds (x + BORDER, y + headerHeight, Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
+    }
+}
+
+/**
+ * Sets the expanded state of the receiver.
+ *
+ * @param expanded the new expanded state
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setExpanded (bool expanded) {
+    checkWidget ();
+    this.expanded = expanded;
+    parent.showItem (this);
+}
+
+public void setImage (Image image) {
+    super.setImage (image);
+    int oldImageHeight = imageHeight;
+    if (image !is null) {
+        Rectangle bounds = image.getBounds ();
+        imageHeight = bounds.height;
+        imageWidth = bounds.width;
+    } else {
+        imageHeight = imageWidth = 0;
+    }
+    if (oldImageHeight !is imageHeight) {
+        parent.layoutItems (parent.indexOf (this), true);
+    } else {
+        redraw ();
+    }
+}
+
+/**
+ * Sets the height of the receiver. This is height of the item when it is expanded, 
+ * excluding the height of the header.
+ *
+ * @param height the new height
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setHeight (int height) {
+    checkWidget ();
+    if (height < 0) return;
+    setBounds (0, 0, width, height, false, true);
+    if (expanded) parent.layoutItems (parent.indexOf (this) + 1, true);
+}
+
+public void setText (String string) {
+    super.setText (string);
+    redraw ();
+}
+}