/*******************************************************************************
* Copyright (c) 2000, 2008 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
*******************************************************************************/
package org.eclipse.swt.layout;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.internal.SerializableCompatibility;
import org.eclipse.swt.widgets.Control;
/**
* <code>GridData</code> is the layout data object associated with
* <code>GridLayout</code>. To set a <code>GridData</code> object into a
* control, you use the <code>Control.setLayoutData(Object)</code> method.
* <p>
* There are two ways to create a <code>GridData</code> object with certain
* fields set. The first is to set the fields directly, like this:
* <pre>
* GridData gridData = new GridData();
* gridData.horizontalAlignment = GridData.FILL;
* gridData.grabExcessHorizontalSpace = true;
* button1.setLayoutData(gridData);
*
* gridData = new GridData();
* gridData.horizontalAlignment = GridData.FILL;
* gridData.verticalAlignment = GridData.FILL;
* gridData.grabExcessHorizontalSpace = true;
* gridData.grabExcessVerticalSpace = true;
* gridData.horizontalSpan = 2;
* button2.setLayoutData(gridData);
* </pre>
* The second is to take advantage of <code>GridData</code> convenience constructors, for example:
* <pre>
* button1.setLayoutData(new GridData (SWT.FILL, SWT.CENTER, true, false));
* button2.setLayoutData(new GridData (SWT.FILL, SWT.FILL, true, true, 2, 1));
* </pre>
* </p>
* <p>
* NOTE: Do not reuse <code>GridData</code> objects. Every control in a
* <code>Composite</code> that is managed by a <code>GridLayout</code>
* must have a unique <code>GridData</code> object. If the layout data
* for a control in a <code>GridLayout</code> is null at layout time,
* a unique <code>GridData</code> object is created for it.
* </p>
*
* @see GridLayout
* @see Control#setLayoutData
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
* @since 1.0
*/
public final class GridData implements SerializableCompatibility {
/**
* verticalAlignment specifies how controls will be positioned
* vertically within a cell.
*
* The default value is CENTER.
*
* Possible values are: <ul>
* <li>SWT.BEGINNING (or SWT.TOP): Position the control at the top of the cell</li>
* <li>SWT.CENTER: Position the control in the vertical center of the cell</li>
* <li>SWT.END (or SWT.BOTTOM): Position the control at the bottom of the cell</li>
* <li>SWT.FILL: Resize the control to fill the cell vertically</li>
* </ul>
*/
public int verticalAlignment = CENTER;
/**
* horizontalAlignment specifies how controls will be positioned
* horizontally within a cell.
*
* The default value is BEGINNING.
*
* Possible values are: <ul>
* <li>SWT.BEGINNING (or SWT.LEFT): Position the control at the left of the cell</li>
* <li>SWT.CENTER: Position the control in the horizontal center of the cell</li>
* <li>SWT.END (or SWT.RIGHT): Position the control at the right of the cell</li>
* <li>SWT.FILL: Resize the control to fill the cell horizontally</li>
* </ul>
*/
public int horizontalAlignment = BEGINNING;
/**
* widthHint specifies the preferred width in pixels. This value
* is the wHint passed into Control.computeSize(int, int, boolean)
* to determine the preferred size of the control.
*
* The default value is SWT.DEFAULT.
*
* @see Control#computeSize(int, int, boolean)
*/
public int widthHint = SWT.DEFAULT;
/**
* heightHint specifies the preferred height in pixels. This value
* is the hHint passed into Control.computeSize(int, int, boolean)
* to determine the preferred size of the control.
*
* The default value is SWT.DEFAULT.
*
* @see Control#computeSize(int, int, boolean)
*/
public int heightHint = SWT.DEFAULT;
/**
* horizontalIndent specifies the number of pixels of indentation
* that will be placed along the left side of the cell.
*
* The default value is 0.
*/
public int horizontalIndent = 0;
/**
* verticalIndent specifies the number of pixels of indentation
* that will be placed along the top side of the cell.
*
* The default value is 0.
*/
public int verticalIndent = 0;
/**
* horizontalSpan specifies the number of column cells that the control
* will take up.
*
* The default value is 1.
*/
public int horizontalSpan = 1;
/**
* verticalSpan specifies the number of row cells that the control
* will take up.
*
* The default value is 1.
*/
public int verticalSpan = 1;
/**
* <p>grabExcessHorizontalSpace specifies whether the width of the cell
* changes depending on the size of the parent Composite. If
* grabExcessHorizontalSpace is <code>true</code>, the following rules
* apply to the width of the cell:</p>
* <ul>
* <li>If extra horizontal space is available in the parent, the cell will
* grow to be wider than its preferred width. The new width
* will be "preferred width + delta" where delta is the extra
* horizontal space divided by the number of grabbing columns.</li>
* <li>If there is not enough horizontal space available in the parent, the
* cell will shrink until it reaches its minimum width as specified by
* GridData.minimumWidth. The new width will be the maximum of
* "minimumWidth" and "preferred width - delta", where delta is
* the amount of space missing divided by the number of grabbing columns.</li>
* <li>If the parent is packed, the cell will be its preferred width
* as specified by GridData.widthHint.</li>
* <li>If the control spans multiple columns and there are no other grabbing
* controls in any of the spanned columns, the last column in the span will
* grab the extra space. If there is at least one other grabbing control
* in the span, the grabbing will be spread over the columns already
* marked as grabExcessHorizontalSpace.</li>
* </ul>
*
* <p>The default value is false.</p>
*
* @see GridData#minimumWidth
* @see GridData#widthHint
*/
public boolean grabExcessHorizontalSpace = false;
/**
* <p>grabExcessVerticalSpace specifies whether the height of the cell
* changes depending on the size of the parent Composite. If
* grabExcessVerticalSpace is <code>true</code>, the following rules
* apply to the height of the cell:</p>
* <ul>
* <li>If extra vertical space is available in the parent, the cell will
* grow to be taller than its preferred height. The new height
* will be "preferred height + delta" where delta is the extra
* vertical space divided by the number of grabbing rows.</li>
* <li>If there is not enough vertical space available in the parent, the
* cell will shrink until it reaches its minimum height as specified by
* GridData.minimumHeight. The new height will be the maximum of
* "minimumHeight" and "preferred height - delta", where delta is
* the amount of space missing divided by the number of grabbing rows.</li>
* <li>If the parent is packed, the cell will be its preferred height
* as specified by GridData.heightHint.</li>
* <li>If the control spans multiple rows and there are no other grabbing
* controls in any of the spanned rows, the last row in the span will
* grab the extra space. If there is at least one other grabbing control
* in the span, the grabbing will be spread over the rows already
* marked as grabExcessVerticalSpace.</li>
* </ul>
*
* <p>The default value is false.</p>
*
* @see GridData#minimumHeight
* @see GridData#heightHint
*/
public boolean grabExcessVerticalSpace = false;
/**
* minimumWidth specifies the minimum width in pixels. This value
* applies only if grabExcessHorizontalSpace is true. A value of
* SWT.DEFAULT means that the minimum width will be the result
* of Control.computeSize(int, int, boolean) where wHint is
* determined by GridData.widthHint.
*
* The default value is 0.
*
* @see Control#computeSize(int, int, boolean)
* @see GridData#widthHint
*/
public int minimumWidth = 0;
/**
* minimumHeight specifies the minimum height in pixels. This value
* applies only if grabExcessVerticalSpace is true. A value of
* SWT.DEFAULT means that the minimum height will be the result
* of Control.computeSize(int, int, boolean) where hHint is
* determined by GridData.heightHint.
*
* The default value is 0.
*
* @see Control#computeSize(int, int, boolean)
* @see GridData#heightHint
*/
public int minimumHeight = 0;
/**
* exclude informs the layout to ignore this control when sizing
* and positioning controls. If this value is <code>true</code>,
* the size and position of the control will not be managed by the
* layout. If this value is <code>false</code>, the size and
* position of the control will be computed and assigned.
*
* The default value is <code>false</code>.
*/
public boolean exclude = false;
/**
* Value for horizontalAlignment or verticalAlignment.
* Position the control at the top or left of the cell.
* Not recommended. Use SWT.BEGINNING, SWT.TOP or SWT.LEFT instead.
*/
public static final int BEGINNING = SWT.BEGINNING;
/**
* Value for horizontalAlignment or verticalAlignment.
* Position the control in the vertical or horizontal center of the cell
* Not recommended. Use SWT.CENTER instead.
*/
public static final int CENTER = 2;
/**
* Value for horizontalAlignment or verticalAlignment.
* Position the control at the bottom or right of the cell
* Not recommended. Use SWT.END, SWT.BOTTOM or SWT.RIGHT instead.
*/
public static final int END = 3;
/**
* Value for horizontalAlignment or verticalAlignment.
* Resize the control to fill the cell horizontally or vertically.
* Not recommended. Use SWT.FILL instead.
*/
public static final int FILL = SWT.FILL;
/**
* Style bit for <code>new GridData(int)</code>.
* Position the control at the top of the cell.
* Not recommended. Use
* <code>new GridData(int, SWT.BEGINNING, boolean, boolean)</code>
* instead.
*/
public static final int VERTICAL_ALIGN_BEGINNING = 1 << 1;
/**
* Style bit for <code>new GridData(int)</code> to position the
* control in the vertical center of the cell.
* Not recommended. Use
* <code>new GridData(int, SWT.CENTER, boolean, boolean)</code>
* instead.
*/
public static final int VERTICAL_ALIGN_CENTER = 1 << 2;
/**
* Style bit for <code>new GridData(int)</code> to position the
* control at the bottom of the cell.
* Not recommended. Use
* <code>new GridData(int, SWT.END, boolean, boolean)</code>
* instead.
*/
public static final int VERTICAL_ALIGN_END = 1 << 3;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fill the cell vertically.
* Not recommended. Use
* <code>new GridData(int, SWT.FILL, boolean, boolean)</code>
* instead
*/
public static final int VERTICAL_ALIGN_FILL = 1 << 4;
/**
* Style bit for <code>new GridData(int)</code> to position the
* control at the left of the cell.
* Not recommended. Use
* <code>new GridData(SWT.BEGINNING, int, boolean, boolean)</code>
* instead.
*/
public static final int HORIZONTAL_ALIGN_BEGINNING = 1 << 5;
/**
* Style bit for <code>new GridData(int)</code> to position the
* control in the horizontal center of the cell.
* Not recommended. Use
* <code>new GridData(SWT.CENTER, int, boolean, boolean)</code>
* instead.
*/
public static final int HORIZONTAL_ALIGN_CENTER = 1 << 6;
/**
* Style bit for <code>new GridData(int)</code> to position the
* control at the right of the cell.
* Not recommended. Use
* <code>new GridData(SWT.END, int, boolean, boolean)</code>
* instead.
*/
public static final int HORIZONTAL_ALIGN_END = 1 << 7;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fill the cell horizontally.
* Not recommended. Use
* <code>new GridData(SWT.FILL, int, boolean, boolean)</code>
* instead.
*/
public static final int HORIZONTAL_ALIGN_FILL = 1 << 8;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fit the remaining horizontal space.
* Not recommended. Use
* <code>new GridData(int, int, true, boolean)</code>
* instead.
*/
public static final int GRAB_HORIZONTAL = 1 << 9;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fit the remaining vertical space.
* Not recommended. Use
* <code>new GridData(int, int, boolean, true)</code>
* instead.
*/
public static final int GRAB_VERTICAL = 1 << 10;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fill the cell vertically and to fit the remaining
* vertical space.
* FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL
* Not recommended. Use
* <code>new GridData(int, SWT.FILL, boolean, true)</code>
* instead.
*/
public static final int FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fill the cell horizontally and to fit the remaining
* horizontal space.
* FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL
* Not recommended. Use
* <code>new GridData(SWT.FILL, int, true, boolean)</code>
* instead.
*/
public static final int FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL;
/**
* Style bit for <code>new GridData(int)</code> to resize the
* control to fill the cell horizontally and vertically and
* to fit the remaining horizontal and vertical space.
* FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL
* Not recommended. Use
* <code>new GridData(SWT.FILL, SWT.FILL, true, true)</code>
* instead.
*/
public static final int FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL;
int cacheWidth = -1, cacheHeight = -1;
int defaultWhint, defaultHhint, defaultWidth = -1, defaultHeight = -1;
int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;
/**
* Constructs a new instance of GridData using
* default values.
*/
public GridData () {
super ();
}
/**
* Constructs a new instance based on the GridData style.
* This constructor is not recommended.
*
* @param style the GridData style
*/
public GridData (int style) {
super ();
if ((style & VERTICAL_ALIGN_BEGINNING) != 0) verticalAlignment = BEGINNING;
if ((style & VERTICAL_ALIGN_CENTER) != 0) verticalAlignment = CENTER;
if ((style & VERTICAL_ALIGN_FILL) != 0) verticalAlignment = FILL;
if ((style & VERTICAL_ALIGN_END) != 0) verticalAlignment = END;
if ((style & HORIZONTAL_ALIGN_BEGINNING) != 0) horizontalAlignment = BEGINNING;
if ((style & HORIZONTAL_ALIGN_CENTER) != 0) horizontalAlignment = CENTER;
if ((style & HORIZONTAL_ALIGN_FILL) != 0) horizontalAlignment = FILL;
if ((style & HORIZONTAL_ALIGN_END) != 0) horizontalAlignment = END;
grabExcessHorizontalSpace = (style & GRAB_HORIZONTAL) != 0;
grabExcessVerticalSpace = (style & GRAB_VERTICAL) != 0;
}
/**
* Constructs a new instance of GridData according to the parameters.
*
* @param horizontalAlignment how control will be positioned horizontally within a cell,
* one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL
* @param verticalAlignment how control will be positioned vertically within a cell,
* one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL
* @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
* @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
*/
public GridData (int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace) {
this (horizontalAlignment, verticalAlignment, grabExcessHorizontalSpace, grabExcessVerticalSpace, 1, 1);
}
/**
* Constructs a new instance of GridData according to the parameters.
*
* @param horizontalAlignment how control will be positioned horizontally within a cell,
* one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL
* @param verticalAlignment how control will be positioned vertically within a cell,
* one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL
* @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
* @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
* @param horizontalSpan the number of column cells that the control will take up
* @param verticalSpan the number of row cells that the control will take up
*/
public GridData (int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace, int horizontalSpan, int verticalSpan) {
super ();
this.horizontalAlignment = horizontalAlignment;
this.verticalAlignment = verticalAlignment;
this.grabExcessHorizontalSpace = grabExcessHorizontalSpace;
this.grabExcessVerticalSpace = grabExcessVerticalSpace;
this.horizontalSpan = horizontalSpan;
this.verticalSpan = verticalSpan;
}
/**
* Constructs a new instance of GridData according to the parameters.
* A value of SWT.DEFAULT indicates that no minimum width or
* no minimum height is specified.
*
* @param width a minimum width for the column
* @param height a minimum height for the row
*/
public GridData (int width, int height) {
super ();
this.widthHint = width;
this.heightHint = height;
}
void computeSize (Control control, int wHint, int hHint, boolean flushCache) {
if (cacheWidth != -1 && cacheHeight != -1) return;
if (wHint == this.widthHint && hHint == this.heightHint) {
if (defaultWidth == -1 || defaultHeight == -1 || wHint != defaultWhint || hHint != 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 == -1 || currentHeight == -1 || wHint != currentWhint || hHint != 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;
defaultWidth = defaultHeight = -1;
currentWidth = currentHeight = -1;
}
String getName () {
String string = getClass ().getName ();
int index = string.lastIndexOf ('.');
if (index == -1) return string;
return string.substring (index + 1, string.length ());
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the GridData object
*/
public String toString () {
String hAlign = "";
switch (horizontalAlignment) {
case SWT.FILL: hAlign = "SWT.FILL"; break;
case SWT.BEGINNING: hAlign = "SWT.BEGINNING"; break;
case SWT.LEFT: hAlign = "SWT.LEFT"; break;
case SWT.END: hAlign = "SWT.END"; break;
case END: hAlign = "GridData.END"; break;
case SWT.RIGHT: hAlign = "SWT.RIGHT"; break;
case SWT.CENTER: hAlign = "SWT.CENTER"; break;
case CENTER: hAlign = "GridData.CENTER"; break;
default: hAlign = "Undefined "+horizontalAlignment; break;
}
String vAlign = "";
switch (verticalAlignment) {
case SWT.FILL: vAlign = "SWT.FILL"; break;
case SWT.BEGINNING: vAlign = "SWT.BEGINNING"; break;
case SWT.TOP: vAlign = "SWT.TOP"; break;
case SWT.END: vAlign = "SWT.END"; break;
case END: vAlign = "GridData.END"; break;
case SWT.BOTTOM: vAlign = "SWT.BOTTOM"; break;
case SWT.CENTER: vAlign = "SWT.CENTER"; break;
case CENTER: vAlign = "GridData.CENTER"; break;
default: vAlign = "Undefined "+verticalAlignment; break;
}
String string = getName()+" {";
string += "horizontalAlignment="+hAlign+" ";
if (horizontalIndent != 0) string += "horizontalIndent="+horizontalIndent+" ";
if (horizontalSpan != 1) string += "horizontalSpan="+horizontalSpan+" ";
if (grabExcessHorizontalSpace) string += "grabExcessHorizontalSpace="+grabExcessHorizontalSpace+" ";
if (widthHint != SWT.DEFAULT) string += "widthHint="+widthHint+" ";
if (minimumWidth != 0) string += "minimumWidth="+minimumWidth+" ";
string += "verticalAlignment="+vAlign+" ";
if (verticalIndent != 0) string += "verticalIndent="+verticalIndent+" ";
if (verticalSpan != 1) string += "verticalSpan="+verticalSpan+" ";
if (grabExcessVerticalSpace) string += "grabExcessVerticalSpace="+grabExcessVerticalSpace+" ";
if (heightHint != SWT.DEFAULT) string += "heightHint="+heightHint+" ";
if (minimumHeight != 0) string += "minimumHeight="+minimumHeight+" ";
if (exclude) string += "exclude="+exclude+" ";
string = string.trim();
string += "}";
return string;
}
}