619 lines
21 KiB
Java
619 lines
21 KiB
Java
/*
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* Copyright (c) 2000, 2006 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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* Declarative Engineering - Major additions (overlays & minimum sizing) + maintenance, formatting, & commenting.
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*/
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package com.foundation.view.swt.layout;
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import org.eclipse.swt.*;
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import org.eclipse.swt.graphics.*;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Control;
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/**
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* <code>GridData</code> is the layout data object associated with
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* <code>GridLayout</code>. To set a <code>GridData</code> object into a
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* control, you use the <code>Control.setLayoutData(Object)</code> method.
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* <p>
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* There are two ways to create a <code>GridData</code> object with certain
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* fields set. The first is to set the fields directly, like this:
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* <pre>
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* GridData gridData = new GridData();
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* gridData.horizontalAlignment = GridData.FILL;
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* gridData.grabExcessHorizontalSpace = true;
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* button1.setLayoutData(gridData);
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* </pre>
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* The second is to take advantage of convenience style bits defined
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* by <code>GridData</code>:
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* <pre>
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* button1.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
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* </pre>
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* </p>
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* <p>
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* NOTE: Do not reuse <code>GridData</code> objects. Every control in a
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* <code>Composite</code> that is managed by a <code>GridLayout</code>
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* must have a unique <code>GridData</code> object. If the layout data
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* for a control in a <code>GridLayout</code> is null at layout time,
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* a unique <code>GridData</code> object is created for it.
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* </p>
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*
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* @see GridLayout
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* @see Control#setLayoutData
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*/
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public final class GridData {
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/**
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* verticalAlignment specifies how controls will be positioned
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* vertically within a cell.
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*
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* The default value is CENTER.
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*
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* Possible values are: <ul>
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* <li>SWT.BEGINNING (or SWT.TOP): Position the control at the top of the cell</li>
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* <li>SWT.CENTER: Position the control in the vertical center of the cell</li>
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* <li>SWT.END (or SWT.BOTTOM): Position the control at the bottom of the cell</li>
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* <li>SWT.FILL: Resize the control to fill the cell vertically</li>
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* </ul>
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*/
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public int verticalAlignment = CENTER;
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/**
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* horizontalAlignment specifies how controls will be positioned
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* horizontally within a cell.
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*
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* The default value is BEGINNING.
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*
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* Possible values are: <ul>
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* <li>SWT.BEGINNING (or SWT.LEFT): Position the control at the left of the cell</li>
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* <li>SWT.CENTER: Position the control in the horizontal center of the cell</li>
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* <li>SWT.END (or SWT.RIGHT): Position the control at the right of the cell</li>
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* <li>SWT.FILL: Resize the control to fill the cell horizontally</li>
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* </ul>
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*/
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public int horizontalAlignment = BEGINNING;
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/**
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* widthHint specifies the preferred width in pixels. This value
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* is the wHint passed into Control.computeSize(int, int, boolean)
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* to determine the preferred size of the control.
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*
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* The default value is SWT.DEFAULT.
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*
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* @see Control#computeSize(int, int, boolean)
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*/
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public int widthHint = SWT.DEFAULT;
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/**
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* heightHint specifies the preferred height in pixels. This value
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* is the hHint passed into Control.computeSize(int, int, boolean)
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* to determine the preferred size of the control.
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*
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* The default value is SWT.DEFAULT.
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*
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* @see Control#computeSize(int, int, boolean)
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*/
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public int heightHint = SWT.DEFAULT;
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/**
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* horizontalIndent specifies the number of pixels of indentation
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* that will be placed along the left side of the cell.
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*
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* The default value is 0.
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*/
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public int horizontalIndent = 0;
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/**
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* verticalIndent specifies the number of pixels of indentation
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* that will be placed along the top side of the cell.
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*
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* The default value is 0.
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*
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* @since 3.1
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*/
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public int verticalIndent = 0;
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/**
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* horizontalSpan specifies the number of column cells that the control
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* will take up.
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*
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* The default value is 1.
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*/
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public int horizontalSpan = 1;
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/**
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* verticalSpan specifies the number of row cells that the control
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* will take up.
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*
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* The default value is 1.
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*/
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public int verticalSpan = 1;
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/**
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* <p>grabExcessHorizontalSpace specifies whether the width of the cell
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* changes depending on the size of the parent Composite. If
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* grabExcessHorizontalSpace is <code>true</code>, the following rules
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* apply to the width of the cell:</p>
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* <ul>
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* <li>If extra horizontal space is available in the parent, the cell will
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* grow to be wider than its preferred width. The new width
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* will be "preferred width + delta" where delta is the extra
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* horizontal space divided by the number of grabbing columns.</li>
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* <li>If there is not enough horizontal space available in the parent, the
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* cell will shrink until it reaches its minimum width as specified by
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* GridData.minimumWidth. The new width will be the maximum of
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* "minimumWidth" and "preferred width - delta", where delta is
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* the amount of space missing divided by the number of grabbing columns.</li>
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* <li>If the parent is packed, the cell will be its preferred width
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* as specified by GridData.widthHint.</li>
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* <li>If the control spans multiple columns and there are no other grabbing
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* controls in any of the spanned columns, the last column in the span will
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* grab the extra space. If there is at least one other grabbing control
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* in the span, the grabbing will be spread over the columns already
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* marked as grabExcessHorizontalSpace.</li>
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* </ul>
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*
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* <p>The default value is false.</p>
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*
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* @see GridData#minimumWidth
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* @see GridData#widthHint
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*/
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public boolean grabExcessHorizontalSpace = false;
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/**
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* <p>grabExcessVerticalSpace specifies whether the height of the cell
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* changes depending on the size of the parent Composite. If
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* grabExcessVerticalSpace is <code>true</code>, the following rules
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* apply to the height of the cell:</p>
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* <ul>
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* <li>If extra vertical space is available in the parent, the cell will
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* grow to be taller than its preferred height. The new height
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* will be "preferred height + delta" where delta is the extra
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* vertical space divided by the number of grabbing rows.</li>
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* <li>If there is not enough vertical space available in the parent, the
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* cell will shrink until it reaches its minimum height as specified by
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* GridData.minimumHeight. The new height will be the maximum of
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* "minimumHeight" and "preferred height - delta", where delta is
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* the amount of space missing divided by the number of grabbing rows.</li>
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* <li>If the parent is packed, the cell will be its preferred height
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* as specified by GridData.heightHint.</li>
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* <li>If the control spans multiple rows and there are no other grabbing
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* controls in any of the spanned rows, the last row in the span will
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* grab the extra space. If there is at least one other grabbing control
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* in the span, the grabbing will be spread over the rows already
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* marked as grabExcessVerticalSpace.</li>
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* </ul>
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*
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* <p>The default value is false.</p>
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*
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* @see GridData#minimumHeight
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* @see GridData#heightHint
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*/
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public boolean grabExcessVerticalSpace = false;
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/**
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* <p>TODO: This should really default to -1, and a value of -1 should be using the control's minimum. Currently 0 or -1 uses the control's minimum, but not for the layout - only for reporting a total minimum for the layout.</p>
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* minimumWidth specifies the minimum width in pixels. This value
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* applies only if grabExcessHorizontalSpace is true. A value of
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* SWT.DEFAULT means that the minimum width will be the result
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* of Control.computeSize(int, int, boolean) where wHint is
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* determined by GridData.widthHint.
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*
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* The default value is 0.
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*
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* @since 3.1
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* @see Control#computeSize(int, int, boolean)
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* @see GridData#widthHint
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*/
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public int minimumWidth = 0;
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/**
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* <p>TODO: This should really default to -1, and a value of -1 should be using the control's minimum. Currently 0 or -1 uses the control's minimum, but not for the layout - only for reporting a total minimum for the layout.</p>
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* minimumHeight specifies the minimum height in pixels. This value
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* applies only if grabExcessVerticalSpace is true. A value of
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* SWT.DEFAULT means that the minimum height will be the result
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* of Control.computeSize(int, int, boolean) where hHint is
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* determined by GridData.heightHint.
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*
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* The default value is 0.
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*
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* @since 3.1
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* @see Control#computeSize(int, int, boolean)
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* @see GridData#heightHint
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*/
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public int minimumHeight = 0;
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/**
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* exclude informs the layout to ignore this control when sizing
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* and positioning controls. If this value is <code>true</code>,
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* the size and position of the control will not be managed by the
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* layout. If this value is <code>false</code>, the size and
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* position of the control will be computed and assigned.
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*
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* The default value is <code>false</code>.
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*
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* @since 3.1
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*/
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public boolean exclude = false;
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/**
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* Value for horizontalAlignment or verticalAlignment.
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* Position the control at the top or left of the cell.
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* Not recommended. Use SWT.BEGINNING, SWT.TOP or SWT.LEFT instead.
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*/
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public static final int BEGINNING = SWT.BEGINNING;
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/**
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* Value for horizontalAlignment or verticalAlignment.
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* Position the control in the vertical or horizontal center of the cell
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* Not recommended. Use SWT.CENTER instead.
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*/
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public static final int CENTER = 2;
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/**
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* Value for horizontalAlignment or verticalAlignment.
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* Position the control at the bottom or right of the cell
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* Not recommended. Use SWT.END, SWT.BOTTOM or SWT.RIGHT instead.
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*/
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public static final int END = 3;
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/**
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* Value for horizontalAlignment or verticalAlignment.
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* Resize the control to fill the cell horizontally or vertically.
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* Not recommended. Use SWT.FILL instead.
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*/
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public static final int FILL = SWT.FILL;
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/**
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* Style bit for <code>new GridData(int)</code>.
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* Position the control at the top of the cell.
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* Not recommended. Use
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* <code>new GridData(int, SWT.BEGINNING, boolean, boolean)</code>
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* instead.
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*/
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public static final int VERTICAL_ALIGN_BEGINNING = 1 << 1;
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/**
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* Style bit for <code>new GridData(int)</code> to position the
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* control in the vertical center of the cell.
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* Not recommended. Use
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* <code>new GridData(int, SWT.CENTER, boolean, boolean)</code>
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* instead.
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*/
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public static final int VERTICAL_ALIGN_CENTER = 1 << 2;
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/**
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* Style bit for <code>new GridData(int)</code> to position the
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* control at the bottom of the cell.
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* Not recommended. Use
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* <code>new GridData(int, SWT.END, boolean, boolean)</code>
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* instead.
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*/
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public static final int VERTICAL_ALIGN_END = 1 << 3;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fill the cell vertically.
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* Not recommended. Use
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* <code>new GridData(int, SWT.FILL, boolean, boolean)</code>
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* instead
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*/
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public static final int VERTICAL_ALIGN_FILL = 1 << 4;
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/**
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* Style bit for <code>new GridData(int)</code> to position the
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* control at the left of the cell.
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* Not recommended. Use
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* <code>new GridData(SWT.BEGINNING, int, boolean, boolean)</code>
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* instead.
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*/
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public static final int HORIZONTAL_ALIGN_BEGINNING = 1 << 5;
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/**
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* Style bit for <code>new GridData(int)</code> to position the
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* control in the horizontal center of the cell.
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* Not recommended. Use
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* <code>new GridData(SWT.CENTER, int, boolean, boolean)</code>
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* instead.
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*/
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public static final int HORIZONTAL_ALIGN_CENTER = 1 << 6;
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/**
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* Style bit for <code>new GridData(int)</code> to position the
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* control at the right of the cell.
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* Not recommended. Use
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* <code>new GridData(SWT.END, int, boolean, boolean)</code>
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* instead.
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*/
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public static final int HORIZONTAL_ALIGN_END = 1 << 7;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fill the cell horizontally.
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* Not recommended. Use
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* <code>new GridData(SWT.FILL, int, boolean, boolean)</code>
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* instead.
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*/
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public static final int HORIZONTAL_ALIGN_FILL = 1 << 8;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fit the remaining horizontal space.
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* Not recommended. Use
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* <code>new GridData(int, int, true, boolean)</code>
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* instead.
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*/
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public static final int GRAB_HORIZONTAL = 1 << 9;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fit the remaining vertical space.
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* Not recommended. Use
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* <code>new GridData(int, int, boolean, true)</code>
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* instead.
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*/
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public static final int GRAB_VERTICAL = 1 << 10;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fill the cell vertically and to fit the remaining
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* vertical space.
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* FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL
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* Not recommended. Use
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* <code>new GridData(int, SWT.FILL, boolean, true)</code>
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* instead.
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*/
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public static final int FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fill the cell horizontally and to fit the remaining
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* horizontal space.
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* FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL
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* Not recommended. Use
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* <code>new GridData(SWT.FILL, int, true, boolean)</code>
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* instead.
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*/
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public static final int FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL;
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/**
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* Style bit for <code>new GridData(int)</code> to resize the
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* control to fill the cell horizontally and vertically and
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* to fit the remaining horizontal and vertical space.
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* FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL
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* Not recommended. Use
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* <code>new GridData(SWT.FILL, SWT.FILL, true, true)</code>
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* instead.
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*/
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public static final int FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL;
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int cacheWidth = -1;
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int cacheHeight = -1;
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int defaultWhint;
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int defaultHhint;
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int defaultWidth = -1;
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int defaultHeight = -1;
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int currentWhint;
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int currentHhint;
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int currentWidth = -1;
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int currentHeight = -1;
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//Declarative Engineering//
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int cacheHSpan = -1;
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int cacheVSpan = -1;
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/**
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* Constructs a new instance of GridData using default values.
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*/
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public GridData() {
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super();
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}//GridData()//
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/**
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* Constructs a new instance based on the GridData style.
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* This constructor is not recommended.
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*
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* @param style the GridData style
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*/
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public GridData(int style) {
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super();
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if((style & VERTICAL_ALIGN_BEGINNING) != 0)
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verticalAlignment = BEGINNING;
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if((style & VERTICAL_ALIGN_CENTER) != 0)
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verticalAlignment = CENTER;
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if((style & VERTICAL_ALIGN_FILL) != 0)
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verticalAlignment = FILL;
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if((style & VERTICAL_ALIGN_END) != 0)
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verticalAlignment = END;
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if((style & HORIZONTAL_ALIGN_BEGINNING) != 0)
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horizontalAlignment = BEGINNING;
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if((style & HORIZONTAL_ALIGN_CENTER) != 0)
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horizontalAlignment = CENTER;
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if((style & HORIZONTAL_ALIGN_FILL) != 0)
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horizontalAlignment = FILL;
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if((style & HORIZONTAL_ALIGN_END) != 0)
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horizontalAlignment = END;
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grabExcessHorizontalSpace = (style & GRAB_HORIZONTAL) != 0;
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grabExcessVerticalSpace = (style & GRAB_VERTICAL) != 0;
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}//GridData()//
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/**
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* Constructs a new instance of GridData according to the parameters.
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*
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* @param horizontalAlignment how control will be positioned horizontally within a cell
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* @param verticalAlignment how control will be positioned vertically within a cell
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* @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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* @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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*
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* @since 3.0
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*/
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public GridData(int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace) {
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this(horizontalAlignment, verticalAlignment, grabExcessHorizontalSpace, grabExcessVerticalSpace, 1, 1);
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}//GridData()//
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/**
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* Constructs a new instance of GridData according to the parameters.
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*
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* @param horizontalAlignment how control will be positioned horizontally within a cell
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* @param verticalAlignment how control will be positioned vertically within a cell
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* @param grabExcessHorizontalSpace whether cell will be made wide enough to fit the remaining horizontal space
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* @param grabExcessVerticalSpace whether cell will be made high enough to fit the remaining vertical space
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* @param horizontalSpan the number of column cells that the control will take up
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* @param verticalSpan the number of row cells that the control will take up
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*
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* @since 3.0
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*/
|
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public GridData(int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace, int horizontalSpan, int verticalSpan) {
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super();
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this.horizontalAlignment = horizontalAlignment;
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this.verticalAlignment = verticalAlignment;
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this.grabExcessHorizontalSpace = grabExcessHorizontalSpace;
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this.grabExcessVerticalSpace = grabExcessVerticalSpace;
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this.horizontalSpan = horizontalSpan;
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this.verticalSpan = verticalSpan;
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}//GridData()//
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/**
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* Computes the size of given control, described by this grid data.
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* @param control The control referencing this grid data.
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|
* @param wHint The width hint.
|
|
* @param hHint The height hint.
|
|
* @param flushCache Whether to flush the cache.
|
|
*/
|
|
void computeSize(Control control, int wHint, int hHint, boolean flushCache) {
|
|
if(cacheWidth == -1 || cacheHeight == -1) {
|
|
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;
|
|
}//if//
|
|
|
|
cacheWidth = defaultWidth;
|
|
cacheHeight = defaultHeight;
|
|
|
|
return;
|
|
}//if//
|
|
|
|
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;
|
|
}//if//
|
|
|
|
cacheWidth = currentWidth;
|
|
cacheHeight = currentHeight;
|
|
}//if//
|
|
}//computeSize()//
|
|
/**
|
|
* Clears any cached values.
|
|
*/
|
|
void flushCache() {
|
|
cacheWidth = cacheHeight = -1;
|
|
defaultWidth = defaultHeight = -1;
|
|
currentWidth = currentHeight = -1;
|
|
}//flushCache()//
|
|
/* (non-Javadoc)
|
|
* @see java.lang.Object#toString()
|
|
*/
|
|
public String toString() {
|
|
String hAlign = "";
|
|
String vAlign = "";
|
|
String string;
|
|
|
|
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;
|
|
}//switch//
|
|
|
|
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;
|
|
}//switch//
|
|
|
|
string = "GridData {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;
|
|
}//toString()//
|
|
}//GridData// |