[EGIT PATCH 05/11] Add new class SWTUtils with helper-methods for creating controls

["Tor Arne Vestbø" <torarnv@gmail.com>]

Copied verbatim from org.eclipse.team.internal.ui and documented

Signed-off-by: Tor Arne Vestbø <torarnv@gmail.com>
---
 .../src/org/spearce/egit/ui/internal/SWTUtils.java |  595 ++++++++++++++++++++
 1 files changed, 595 insertions(+), 0 deletions(-)
 create mode 100644 org.spearce.egit.ui/src/org/spearce/egit/ui/internal/SWTUtils.java

diff --git a/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/SWTUtils.java b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/SWTUtils.java
new file mode 100644
index 0000000..fe65bbb
--- /dev/null
+++ b/org.spearce.egit.ui/src/org/spearce/egit/ui/internal/SWTUtils.java
@@ -0,0 +1,595 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+
+package org.spearce.egit.ui.internal;
+
+import org.eclipse.core.runtime.Assert;
+import org.eclipse.jface.dialogs.Dialog;
+import org.eclipse.jface.dialogs.IDialogConstants;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.FontMetrics;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.*;
+import org.eclipse.ui.dialogs.PreferenceLinkArea;
+import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;
+
+/**
+ * A collection of factory methods for creating common SWT controls
+ */
+public class SWTUtils {
+
+	/** */
+	public static final int MARGINS_DEFAULT = -1;
+
+	/** */
+	public static final int MARGINS_NONE = 0;
+
+	/** */
+	public static final int MARGINS_DIALOG = 1;
+
+	/**
+	 * Creates a preference link which will open in the specified container
+	 * 
+	 * @param container
+	 * @param parent
+	 * @param pageId
+	 * @param text
+	 * 
+	 * @return the created link
+	 */
+	public static PreferenceLinkArea createPreferenceLink(
+			IWorkbenchPreferenceContainer container, Composite parent,
+			String pageId, String text) {
+		final PreferenceLinkArea area = new PreferenceLinkArea(parent,
+				SWT.NONE, pageId, text, container, null);
+		return area;
+	}
+
+	/**
+	 * Creates a grid data with the specified metrics
+	 * 
+	 * @param width
+	 * @param height
+	 * @param hFill
+	 * @param vFill
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createGridData(int width, int height, boolean hFill,
+			boolean vFill) {
+		return createGridData(width, height, hFill ? SWT.FILL : SWT.BEGINNING,
+				vFill ? SWT.FILL : SWT.CENTER, hFill, vFill);
+	}
+
+	/**
+	 * Creates a grid data with the specified metrics
+	 * 
+	 * @param width
+	 * @param height
+	 * @param hAlign
+	 * @param vAlign
+	 * @param hGrab
+	 * @param vGrab
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createGridData(int width, int height, int hAlign,
+			int vAlign, boolean hGrab, boolean vGrab) {
+		final GridData gd = new GridData(hAlign, vAlign, hGrab, vGrab);
+		gd.widthHint = width;
+		gd.heightHint = height;
+		return gd;
+	}
+
+	/**
+	 * Creates a horizontal grid data with the default metrics
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createHFillGridData() {
+		return createHFillGridData(1);
+	}
+
+	/**
+	 * Creates a horizontal grid data with the specified span
+	 * 
+	 * @param span
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createHFillGridData(int span) {
+		final GridData gd = createGridData(0, SWT.DEFAULT, SWT.FILL,
+				SWT.CENTER, true, false);
+		gd.horizontalSpan = span;
+		return gd;
+	}
+
+	/**
+	 * Creates a horizontal fill composite with the specified margins
+	 * 
+	 * @param parent
+	 * @param margins
+	 * 
+	 * @return the created composite
+	 */
+	public static Composite createHFillComposite(Composite parent, int margins) {
+		return createHFillComposite(parent, margins, 1);
+	}
+
+	/**
+	 * Creates a horizontal fill composite with the specified margins and
+	 * columns
+	 * 
+	 * @param parent
+	 * @param margins
+	 * @param columns
+	 * 
+	 * @return the created composite
+	 */
+	public static Composite createHFillComposite(Composite parent, int margins,
+			int columns) {
+		final Composite composite = new Composite(parent, SWT.NONE);
+		composite.setFont(parent.getFont());
+		composite.setLayoutData(createHFillGridData());
+		composite.setLayout(createGridLayout(columns,
+				new PixelConverter(parent), margins));
+		return composite;
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill composite with the specified margins
+	 * 
+	 * @param parent
+	 * @param margins
+	 * 
+	 * @return the created composite
+	 */
+	public static Composite createHVFillComposite(Composite parent, int margins) {
+		return createHVFillComposite(parent, margins, 1);
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill composite with the specified margins
+	 * and columns
+	 * 
+	 * @param parent
+	 * @param margins
+	 * @param columns
+	 * 
+	 * @return the created composite
+	 */
+	public static Composite createHVFillComposite(Composite parent,
+			int margins, int columns) {
+		final Composite composite = new Composite(parent, SWT.NONE);
+		composite.setFont(parent.getFont());
+		composite.setLayoutData(createHVFillGridData());
+		composite.setLayout(createGridLayout(columns,
+				new PixelConverter(parent), margins));
+		return composite;
+	}
+
+	/**
+	 * Creates a horizontal fill group with the specified text and margins
+	 * 
+	 * @param parent
+	 * @param text
+	 * @param margins
+	 * @return the created group
+	 */
+	public static Group createHFillGroup(Composite parent, String text,
+			int margins) {
+		return createHFillGroup(parent, text, margins, 1);
+	}
+
+	/**
+	 * Creates a horizontal fill group with the specified text, margins and rows
+	 * 
+	 * @param parent
+	 * @param text
+	 * @param margins
+	 * @param rows
+	 * 
+	 * @return the created group
+	 */
+	public static Group createHFillGroup(Composite parent, String text,
+			int margins, int rows) {
+		final Group group = new Group(parent, SWT.NONE);
+		group.setFont(parent.getFont());
+		group.setLayoutData(createHFillGridData());
+		if (text != null)
+			group.setText(text);
+		group.setLayout(createGridLayout(rows, new PixelConverter(parent),
+				margins));
+		return group;
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill group with the specified text and
+	 * margins
+	 * 
+	 * @param parent
+	 * @param text
+	 * @param margins
+	 * 
+	 * @return the created group
+	 */
+	public static Group createHVFillGroup(Composite parent, String text,
+			int margins) {
+		return createHVFillGroup(parent, text, margins, 1);
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill group with the specified text, margins
+	 * and rows
+	 * 
+	 * @param parent
+	 * @param text
+	 * @param margins
+	 * @param rows
+	 * 
+	 * @return the created group
+	 */
+	public static Group createHVFillGroup(Composite parent, String text,
+			int margins, int rows) {
+		final Group group = new Group(parent, SWT.NONE);
+		group.setFont(parent.getFont());
+		group.setLayoutData(createHVFillGridData());
+		if (text != null)
+			group.setText(text);
+		group.setLayout(createGridLayout(rows, new PixelConverter(parent),
+				margins));
+		return group;
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill grid data with the default metrics
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createHVFillGridData() {
+		return createHVFillGridData(1);
+	}
+
+	/**
+	 * Creates a horizontal/vertical fill grid data with the specified span
+	 * 
+	 * @param span
+	 * 
+	 * @return the created grid data
+	 */
+	public static GridData createHVFillGridData(int span) {
+		final GridData gd = createGridData(0, 0, true, true);
+		gd.horizontalSpan = span;
+		return gd;
+	}
+
+	/**
+	 * Creates a grid layout with the specified number of columns and the
+	 * standard spacings.
+	 * 
+	 * @param numColumns
+	 *            the number of columns
+	 * @param converter
+	 *            the pixel converter
+	 * @param margins
+	 *            one of <code>MARGINS_DEFAULT</code>, <code>MARGINS_NONE</code>
+	 *            or <code>MARGINS_DIALOG</code>.
+	 * 
+	 * @return the created grid layout
+	 */
+	public static GridLayout createGridLayout(int numColumns,
+			PixelConverter converter, int margins) {
+		Assert.isTrue(margins == MARGINS_DEFAULT || margins == MARGINS_NONE
+				|| margins == MARGINS_DIALOG);
+
+		final GridLayout layout = new GridLayout(numColumns, false);
+		layout.horizontalSpacing = converter
+				.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
+		layout.verticalSpacing = converter
+				.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
+
+		switch (margins) {
+		case MARGINS_NONE:
+			layout.marginLeft = layout.marginRight = 0;
+			layout.marginTop = layout.marginBottom = 0;
+			break;
+		case MARGINS_DIALOG:
+			layout.marginLeft = layout.marginRight = converter
+					.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
+			layout.marginTop = layout.marginBottom = converter
+					.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
+			break;
+		case MARGINS_DEFAULT:
+			layout.marginLeft = layout.marginRight = layout.marginWidth;
+			layout.marginTop = layout.marginBottom = layout.marginHeight;
+		}
+		layout.marginWidth = layout.marginHeight = 0;
+		return layout;
+	}
+
+	/**
+	 * Creates a label with the specified message
+	 * 
+	 * @param parent
+	 * @param message
+	 * 
+	 * @return the created label
+	 */
+	public static Label createLabel(Composite parent, String message) {
+		return createLabel(parent, message, 1);
+	}
+
+	/**
+	 * Creates a label with the specified message and span
+	 * 
+	 * @param parent
+	 * @param message
+	 * @param span
+	 * 
+	 * @return the created label
+	 */
+	public static Label createLabel(Composite parent, String message, int span) {
+		final Label label = new Label(parent, SWT.WRAP);
+		if (message != null)
+			label.setText(message);
+		label.setLayoutData(createHFillGridData(span));
+		return label;
+	}
+
+	/**
+	 * Creates a check box with the specified message
+	 * 
+	 * @param parent
+	 * @param message
+	 * 
+	 * @return the created check box
+	 */
+	public static Button createCheckBox(Composite parent, String message) {
+		return createCheckBox(parent, message, 1);
+	}
+
+	/**
+	 * Creates a check box with the specified message and span
+	 * 
+	 * @param parent
+	 * @param message
+	 * @param span
+	 * 
+	 * @return the created check box
+	 */
+	public static Button createCheckBox(Composite parent, String message,
+			int span) {
+		final Button button = new Button(parent, SWT.CHECK);
+		button.setText(message);
+		button.setLayoutData(createHFillGridData(span));
+		return button;
+	}
+
+	/**
+	 * Creates a radio button with the specified message
+	 * 
+	 * @param parent
+	 * @param message
+	 * 
+	 * @return the created radio button
+	 */
+	public static Button createRadioButton(Composite parent, String message) {
+		return createRadioButton(parent, message, 1);
+	}
+
+	/**
+	 * Creates a radio button with the specified message and span
+	 * 
+	 * @param parent
+	 * @param message
+	 * @param span
+	 * 
+	 * @return the created radio button
+	 */
+	public static Button createRadioButton(Composite parent, String message,
+			int span) {
+		final Button button = new Button(parent, SWT.RADIO);
+		button.setText(message);
+		button.setLayoutData(createHFillGridData(span));
+		return button;
+	}
+
+	/**
+	 * Creates a text control
+	 * 
+	 * @param parent
+	 * 
+	 * @return the created text control
+	 */
+	public static Text createText(Composite parent) {
+		return createText(parent, 1);
+	}
+
+	/**
+	 * Creates a text control with the specified span
+	 * 
+	 * @param parent
+	 * @param span
+	 * 
+	 * @return the created text control
+	 */
+	public static Text createText(Composite parent, int span) {
+		final Text text = new Text(parent, SWT.SINGLE | SWT.BORDER);
+		text.setLayoutData(createHFillGridData(span));
+		return text;
+	}
+
+	/**
+	 * Creates a place holder with the specified height and span
+	 * 
+	 * @param parent
+	 * @param heightInChars
+	 * @param span
+	 * 
+	 * @return the created place holder
+	 */
+	public static Control createPlaceholder(Composite parent,
+			int heightInChars, int span) {
+		Assert.isTrue(heightInChars > 0);
+		final Control placeHolder = new Composite(parent, SWT.NONE);
+		final GridData gd = new GridData(SWT.BEGINNING, SWT.TOP, false, false);
+		gd.heightHint = new PixelConverter(parent)
+				.convertHeightInCharsToPixels(heightInChars);
+		gd.horizontalSpan = span;
+		placeHolder.setLayoutData(gd);
+		return placeHolder;
+	}
+
+	/**
+	 * Creates a place holder with the specified height
+	 * 
+	 * @param parent
+	 * @param heightInChars
+	 * @return the created place holder
+	 */
+	public static Control createPlaceholder(Composite parent, int heightInChars) {
+		return createPlaceholder(parent, heightInChars, 1);
+	}
+
+	/**
+	 * Creates a pixel converter
+	 * 
+	 * @param control
+	 * 
+	 * @return the created pixel converter
+	 */
+	public static PixelConverter createDialogPixelConverter(Control control) {
+		Dialog.applyDialogFont(control);
+		return new PixelConverter(control);
+	}
+
+	/**
+	 * Calculates the size of the specified controls, using the specified
+	 * converter
+	 * 
+	 * @param converter
+	 * @param controls
+	 * 
+	 * @return the size of the control(s)
+	 */
+	public static int calculateControlSize(PixelConverter converter,
+			Control[] controls) {
+		return calculateControlSize(converter, controls, 0, controls.length - 1);
+	}
+
+	/**
+	 * Calculates the size of the specified subset of controls, using the
+	 * specified converter
+	 * 
+	 * @param converter
+	 * @param controls
+	 * @param start
+	 * @param end
+	 * 
+	 * @return the created control
+	 */
+	public static int calculateControlSize(PixelConverter converter,
+			Control[] controls, int start, int end) {
+		int minimum = converter
+				.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
+		for (int i = start; i <= end; i++) {
+			final int length = controls[i]
+					.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
+			if (minimum < length)
+				minimum = length;
+		}
+		return minimum;
+	}
+
+	/**
+	 * Equalizes the specified controls using the specified converter
+	 * 
+	 * @param converter
+	 * @param controls
+	 */
+	public static void equalizeControls(PixelConverter converter,
+			Control[] controls) {
+		equalizeControls(converter, controls, 0, controls.length - 1);
+	}
+
+	/**
+	 * Equalizes the specified subset of controls using the specified converter
+	 * 
+	 * @param converter
+	 * @param controls
+	 * @param start
+	 * @param end
+	 */
+	public static void equalizeControls(PixelConverter converter,
+			Control[] controls, int start, int end) {
+		final int size = calculateControlSize(converter, controls, start, end);
+		for (int i = start; i <= end; i++) {
+			final Control button = controls[i];
+			if (button.getLayoutData() instanceof GridData) {
+				((GridData) button.getLayoutData()).widthHint = size;
+			}
+		}
+	}
+
+	/**
+	 * Gets the width of the longest string in <code>strings</code>, using the
+	 * specified pixel converter
+	 * 
+	 * @param converter
+	 * @param strings
+	 * 
+	 * @return the width of the longest string
+	 */
+	public static int getWidthInCharsForLongest(PixelConverter converter,
+			String[] strings) {
+		int minimum = 0;
+		for (int i = 0; i < strings.length; i++) {
+			final int length = converter.convertWidthInCharsToPixels(strings[i]
+					.length());
+			if (minimum < length)
+				minimum = length;
+		}
+		return minimum;
+	}
+
+	private static class PixelConverter {
+
+		private final FontMetrics fFontMetrics;
+
+		public PixelConverter(Control control) {
+			GC gc = new GC(control);
+			try {
+				gc.setFont(control.getFont());
+				fFontMetrics = gc.getFontMetrics();
+			} finally {
+				gc.dispose();
+			}
+		}
+
+		public int convertHeightInCharsToPixels(int chars) {
+			return Dialog.convertHeightInCharsToPixels(fFontMetrics, chars);
+		}
+
+		public int convertHorizontalDLUsToPixels(int dlus) {
+			return Dialog.convertHorizontalDLUsToPixels(fFontMetrics, dlus);
+		}
+
+		public int convertVerticalDLUsToPixels(int dlus) {
+			return Dialog.convertVerticalDLUsToPixels(fFontMetrics, dlus);
+		}
+
+		public int convertWidthInCharsToPixels(int chars) {
+			return Dialog.convertWidthInCharsToPixels(fFontMetrics, chars);
+		}
+	}
+}
-- 
1.6.1.2.309.g2ea3