--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/layout/FormData.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,345 @@
+/*******************************************************************************
+ * 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.layout.FormData;
+
+import dwt.dwthelper.utils;
+
+ 
+import dwt.DWT;
+import dwt.graphics.Point;
+import dwt.widgets.Control;
+
+/**
+ * Instances of this class are used to define the attachments 
+ * of a control in a <code>FormLayout</code>. 
+ * <p>
+ * To set a <code>FormData</code> object into a control, you use the 
+ * <code>setLayoutData ()</code> method. To define attachments for the 
+ * <code>FormData</code>, set the fields directly, like this:
+ * <pre>
+ *      FormData data = new FormData();
+ *      data.left = new FormAttachment(0,5);
+ *      data.right = new FormAttachment(100,-5);
+ *      button.setLayoutData(formData);
+ * </pre>
+ * </p>
+ * <p>
+ * <code>FormData</code> contains the <code>FormAttachments</code> for 
+ * each edge of the control that the <code>FormLayout</code> uses to
+ * determine the size and position of the control. <code>FormData</code>
+ * objects also allow you to set the width and height of controls within
+ * a <code>FormLayout</code>. 
+ * </p>
+ * 
+ * @see FormLayout
+ * @see FormAttachment
+ * 
+ * @since 2.0
+ */
+public final class FormData {
+    /**
+     * width specifies the preferred width in pixels. This value
+     * is the wHint passed into Control.computeSize(int, int, bool) 
+     * to determine the preferred size of the control.
+     *
+     * The default value is DWT.DEFAULT.
+     *
+     * @see Control#computeSize(int, int, bool)
+     */
+    public int width = DWT.DEFAULT;
+    /**
+     * height specifies the preferred height in pixels. This value
+     * is the hHint passed into Control.computeSize(int, int, bool) 
+     * to determine the preferred size of the control.
+     *
+     * The default value is DWT.DEFAULT.
+     *
+     * @see Control#computeSize(int, int, bool)
+     */
+    public int height = DWT.DEFAULT;
+    /**
+     * left specifies the attachment of the left side of 
+     * the control.
+     */
+    public FormAttachment left;
+    /**
+     * right specifies the attachment of the right side of
+     * the control.
+     */
+    public FormAttachment right;
+    /**
+     * top specifies the attachment of the top of the control.
+     */
+    public FormAttachment top;
+    /**
+     * bottom specifies the attachment of the bottom of the
+     * control.
+     */
+    public FormAttachment bottom;
+    
+    int cacheWidth = -1, cacheHeight = -1;
+    int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1;
+    int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;
+    FormAttachment cacheLeft, cacheRight, cacheTop, cacheBottom;
+    bool isVisited, needed;
+    
+/**
+ * Constructs a new instance of FormData using
+ * default values.
+ */
+public FormData () {
+}
+    
+/**
+ * Constructs a new instance of FormData according to the parameters.
+ * A value of DWT.DEFAULT indicates that no minimum width or
+ * no minimum height is specified.
+ * 
+ * @param width a minimum width for the control
+ * @param height a minimum height for the control
+ */
+public FormData (int width, int height) {
+    this.width = width;
+    this.height = height;
+}
+
+void computeSize (Control control, int wHint, int hHint, bool flushCache) {
+    if (cacheWidth !is -1 && cacheHeight !is -1) return;
+    if (wHint is this.width && hHint is this.height) {
+        if (defaultWidth is -1 || defaultHeight is -1 || wHint !is defaultWhint || hHint !is defaultHhint) {
+            Point size =  control.computeSize (wHint, hHint, flushCache);
+            defaultWhint = wHint;
+            defaultHhint = hHint;
+            defaultWidth = size.x;
+            defaultHeight = size.y;
+        }
+        cacheWidth = defaultWidth;
+        cacheHeight = defaultHeight;
+        return;
+    }
+    if (currentWidth is -1 || currentHeight is -1 || wHint !is currentWhint || hHint !is currentHhint) {
+        Point size =  control.computeSize (wHint, hHint, flushCache);
+        currentWhint = wHint;
+        currentHhint = hHint;
+        currentWidth = size.x;
+        currentHeight = size.y;
+    }
+    cacheWidth = currentWidth;
+    cacheHeight = currentHeight;
+}
+
+void flushCache () {
+    cacheWidth = cacheHeight = -1;
+    defaultHeight = defaultWidth = -1;
+    currentHeight = currentWidth = -1;
+}
+
+int getWidth (Control control, bool flushCache) {
+    needed = true;
+    computeSize (control, width, height, flushCache);
+    return cacheWidth;
+}
+
+int getHeight (Control control, bool flushCache) {
+    computeSize (control, width, height, flushCache);
+    return cacheHeight;
+}
+
+FormAttachment getBottomAttachment (Control control, int spacing, bool flushCache) {
+    if (cacheBottom !is null) return cacheBottom;
+    if (isVisited) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache));
+    if (bottom is null) {
+        if (top is null) return cacheBottom = new FormAttachment (0, getHeight (control, flushCache));
+        return cacheBottom = getTopAttachment (control, spacing, flushCache).plus (getHeight (control, flushCache));
+    }
+    Control bottomControl = bottom.control;
+    if (bottomControl !is null) {
+        if (bottomControl.isDisposed ()) {
+            bottom.control = bottomControl = null;
+        } else {
+            if (bottomControl.getParent () !is control.getParent ()) {
+                bottomControl = null;
+            }
+        }
+    }
+    if (bottomControl is null) return cacheBottom = bottom;
+    isVisited = true;
+    FormData bottomData = (FormData) bottomControl.getLayoutData ();
+    FormAttachment bottomAttachment = bottomData.getBottomAttachment (bottomControl, spacing, flushCache);
+    switch (bottom.alignment) {
+        case DWT.BOTTOM: 
+            cacheBottom = bottomAttachment.plus (bottom.offset);
+            break;
+        case DWT.CENTER: {
+            FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache);
+            FormAttachment bottomHeight = bottomAttachment.minus (topAttachment);
+            cacheBottom = bottomAttachment.minus (bottomHeight.minus (getHeight (control, flushCache)).divide (2));
+            break;
+        }
+        default: {
+            FormAttachment topAttachment = bottomData.getTopAttachment (bottomControl, spacing, flushCache);
+            cacheBottom = topAttachment.plus (bottom.offset - spacing); 
+            break;
+        }
+    }
+    isVisited = false;
+    return cacheBottom;
+}
+
+FormAttachment getLeftAttachment (Control control, int spacing, bool flushCache) {
+    if (cacheLeft !is null) return cacheLeft;
+    if (isVisited) return cacheLeft = new FormAttachment (0, 0);
+    if (left is null) {
+        if (right is null) return cacheLeft = new FormAttachment (0, 0);
+        return cacheLeft = getRightAttachment (control, spacing, flushCache).minus (getWidth (control, flushCache));
+    }
+    Control leftControl = left.control;
+    if (leftControl !is null) {
+        if (leftControl.isDisposed ()) {
+            left.control = leftControl = null;
+        } else {
+            if (leftControl.getParent () !is control.getParent ()) {
+                leftControl = null;
+            }
+        }
+    }
+    if (leftControl is null) return cacheLeft = left;
+    isVisited = true;
+    FormData leftData = (FormData) leftControl.getLayoutData ();
+    FormAttachment leftAttachment = leftData.getLeftAttachment (leftControl, spacing, flushCache);
+    switch (left.alignment) {
+        case DWT.LEFT:
+            cacheLeft = leftAttachment.plus (left.offset);
+            break;
+        case DWT.CENTER: {
+            FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache);
+            FormAttachment leftWidth = rightAttachment.minus (leftAttachment);
+            cacheLeft = leftAttachment.plus (leftWidth.minus (getWidth (control, flushCache)).divide (2));
+            break;
+        }
+        default: {
+            FormAttachment rightAttachment = leftData.getRightAttachment (leftControl, spacing, flushCache);
+            cacheLeft = rightAttachment.plus (left.offset + spacing); 
+        }
+    }
+    isVisited = false; 
+    return cacheLeft;
+}
+    
+String getName () {
+    String string = getClass ().getName ();
+    int index = string.lastIndexOf ('.');
+    if (index is -1) return string;
+    return string.substring (index + 1, string.length ());
+}
+
+FormAttachment getRightAttachment (Control control, int spacing, bool flushCache) {
+    if (cacheRight !is null) return cacheRight;
+    if (isVisited) return cacheRight = new FormAttachment (0, getWidth (control, flushCache));
+    if (right is null) {
+        if (left is null) return cacheRight = new FormAttachment (0, getWidth (control, flushCache));
+        return cacheRight = getLeftAttachment (control, spacing, flushCache).plus (getWidth (control, flushCache));
+    }
+    Control rightControl = right.control;
+    if (rightControl !is null) {
+        if (rightControl.isDisposed ()) {
+            right.control = rightControl = null;
+        } else {
+            if (rightControl.getParent () !is control.getParent ()) {
+                rightControl = null;
+            }
+        }
+    }
+    if (rightControl is null) return cacheRight = right;
+    isVisited = true;
+    FormData rightData = (FormData) rightControl.getLayoutData ();
+    FormAttachment rightAttachment = rightData.getRightAttachment (rightControl, spacing, flushCache);
+    switch (right.alignment) {
+        case DWT.RIGHT: 
+            cacheRight = rightAttachment.plus (right.offset);
+            break;
+        case DWT.CENTER: {
+            FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache);
+            FormAttachment rightWidth = rightAttachment.minus (leftAttachment);
+            cacheRight = rightAttachment.minus (rightWidth.minus (getWidth (control, flushCache)).divide (2));
+            break;
+        }
+        default: {
+            FormAttachment leftAttachment = rightData.getLeftAttachment (rightControl, spacing, flushCache);
+            cacheRight = leftAttachment.plus (right.offset - spacing);
+            break;
+        }
+    }
+    isVisited = false;
+    return cacheRight;
+}
+
+FormAttachment getTopAttachment (Control control, int spacing, bool flushCache) {
+    if (cacheTop !is null) return cacheTop;
+    if (isVisited) return cacheTop = new FormAttachment (0, 0);
+    if (top is null) {
+        if (bottom is null) return cacheTop = new FormAttachment (0, 0);
+        return cacheTop = getBottomAttachment (control, spacing, flushCache).minus (getHeight (control, flushCache));
+    }
+    Control topControl = top.control;
+    if (topControl !is null) {
+        if (topControl.isDisposed ()) {
+            top.control = topControl = null;
+        } else {
+            if (topControl.getParent () !is control.getParent ()) {
+                topControl = null;
+            }
+        }
+    }
+    if (topControl is null) return cacheTop = top;
+    isVisited = true;
+    FormData topData = (FormData) topControl.getLayoutData ();
+    FormAttachment topAttachment = topData.getTopAttachment (topControl, spacing, flushCache);
+    switch (top.alignment) {
+        case DWT.TOP:
+            cacheTop = topAttachment.plus (top.offset);
+            break;
+        case DWT.CENTER: {
+            FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache);
+            FormAttachment topHeight = bottomAttachment.minus (topAttachment);
+            cacheTop = topAttachment.plus (topHeight.minus (getHeight (control, flushCache)).divide (2));
+            break;
+        }
+        default: {
+            FormAttachment bottomAttachment = topData.getBottomAttachment (topControl, spacing, flushCache);
+            cacheTop = bottomAttachment.plus (top.offset + spacing);
+            break;
+        }
+    }
+    isVisited = false;
+    return cacheTop;
+}
+
+/**
+ * Returns a string containing a concise, human-readable
+ * description of the receiver.
+ *
+ * @return a string representation of the FormData object
+ */
+public String toString () {
+    String string = getName()+" {";
+    if (width !is DWT.DEFAULT) string += "width="+width+" ";
+    if (height !is DWT.DEFAULT) string += "height="+height+" ";
+    if (left !is null) string += "left="+left+" ";
+    if (right !is null) string += "right="+right+" ";
+    if (top !is null) string += "top="+top+" ";
+    if (bottom !is null) string += "bottom="+bottom+" ";
+    string = string.trim();
+    string += "}";
+    return string;
+}
+
+}