diff org.eclipse.draw2d/src/org/eclipse/draw2d/widgets/MultiLineLabel.d @ 12:bc29606a740c

Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.draw2d/src/org/eclipse/draw2d/widgets/MultiLineLabel.d	Sat Mar 14 18:23:29 2009 +0100
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+/*******************************************************************************
+ * 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.draw2d.widgets.MultiLineLabel;
+
+import java.lang.all;
+
+
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.accessibility.ACC;
+import org.eclipse.swt.accessibility.AccessibleAdapter;
+import org.eclipse.swt.accessibility.AccessibleControlAdapter;
+import org.eclipse.swt.accessibility.AccessibleControlEvent;
+import org.eclipse.swt.accessibility.AccessibleEvent;
+import org.eclipse.swt.events.KeyAdapter;
+import org.eclipse.swt.events.KeyEvent;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.draw2d.Border;
+import org.eclipse.draw2d.ColorConstants;
+import org.eclipse.draw2d.FigureCanvas;
+import org.eclipse.draw2d.FocusEvent;
+import org.eclipse.draw2d.Graphics;
+import org.eclipse.draw2d.MarginBorder;
+import org.eclipse.draw2d.Viewport;
+import org.eclipse.draw2d.geometry.Point;
+import org.eclipse.draw2d.text.FlowPage;
+import org.eclipse.draw2d.text.TextFlow;
+import org.eclipse.draw2d.widgets.ImageBorder;
+
+/**
+ * A widget for displaying a multi-line string. The label will have a vertical or
+ * horizontal scrollbar when needed. Unlike the platform Label, this label is focusable
+ * and accessible to screen-readers.
+ *
+ * @author hudsonr
+ */
+public final class MultiLineLabel : FigureCanvas {
+
+private TextFlow textFlow;
+private static Border MARGIN_;
+static Border MARGIN(){
+    if( MARGIN_ is null ){
+        synchronized( MultiLineLabel.classinfo ){
+            if( MARGIN_ is null ){
+                MARGIN_ = new MarginBorder(2);
+            }
+        }
+    }
+    return MARGIN_;
+}
+
+private Image image;
+
+class FocusableViewport : Viewport {
+    this() {
+        super(true);
+        setFocusTraversable(true);
+        setBorder(MARGIN);
+    }
+
+    public void handleFocusGained(FocusEvent event) {
+        super.handleFocusGained(event);
+        repaint();
+    }
+
+    public void handleFocusLost(FocusEvent event) {
+        super.handleFocusLost(event);
+        repaint();
+    }
+
+    protected void paintBorder(Graphics graphics) {
+        super.paintBorder(graphics);
+        if (hasFocus()) {
+            graphics.setForegroundColor(ColorConstants.black);
+            graphics.setBackgroundColor(ColorConstants.white);
+            graphics.drawFocus(getBounds().getResized(-1, -1));
+        }
+    }
+}
+
+/**
+ * Constructs a new MultiLineLabel with the given parent.
+ * @param parent the parent
+ */
+public this(Composite parent) {
+    super(parent);
+    setViewport(new FocusableViewport());
+
+    FlowPage page = new FlowPage();
+    textFlow = new TextFlow();
+    page.add(textFlow);
+
+    setContents(page);
+    getViewport().setContentsTracksWidth(true);
+    addAccessibility();
+}
+
+private void addAccessibility() {
+    getAccessible().addAccessibleControlListener(new class() AccessibleControlAdapter {
+        public void getRole(AccessibleControlEvent e) {
+            e.detail = ACC.ROLE_LABEL;
+        }
+        public void getState(AccessibleControlEvent e) {
+            e.detail = ACC.STATE_READONLY;
+        }
+    });
+    getAccessible().addAccessibleListener(new class() AccessibleAdapter {
+        public void getName(AccessibleEvent e) {
+            e.result = getText();
+        }
+    });
+    addKeyListener(new class() KeyAdapter {
+        public void keyPressed(KeyEvent e) {
+            Point p = getViewport().getViewLocation();
+            int dy = getFont().getFontData()[0].getHeight();
+            int dx = dy * 3 / 2;
+            bool mirrored = (e.widget.getStyle() & SWT.MIRRORED) !is 0;
+            if (e.keyCode is SWT.ARROW_DOWN) {
+                scrollToY(p.y + dy / 2);
+                scrollToY(p.y + dy);
+                scrollToY(p.y + dy * 3 / 2);
+                scrollToY(p.y + dy * 2);
+            } else if (e.keyCode is SWT.ARROW_UP) {
+                scrollToY(p.y - dy / 2);
+                scrollToY(p.y - dy);
+                scrollToY(p.y - dy * 3 / 2);
+                scrollToY(p.y - dy * 2);
+            } else if ((!mirrored && e.keyCode is SWT.ARROW_RIGHT)
+                    || (mirrored && e.keyCode is SWT.ARROW_LEFT)) {
+                scrollToX(p.x + dx);
+                scrollToX(p.x + dx * 2);
+                scrollToX(p.x + dx * 3);
+            } else if ((!mirrored && e.keyCode is SWT.ARROW_LEFT)
+                    || (mirrored && e.keyCode is SWT.ARROW_RIGHT)) {
+                scrollToX(p.x - dx);
+                scrollToX(p.x - dx * 2);
+                scrollToX(p.x - dx * 3);
+            }
+        }
+    });
+}
+
+/**
+ * @see org.eclipse.swt.widgets.Control#setEnabled(bool)
+ */
+public void setEnabled(bool enabled) {
+    super.setEnabled(enabled);
+    textFlow.setEnabled(getEnabled());
+}
+
+/**
+ * @return the Image for this label, or <code>null</code> if there is none
+ * @see #setImage(Image)
+ */
+public Image getImage() {
+    return image;
+}
+
+/**
+ * Returns the text in this label.
+ * @return the text
+ */
+public String getText() {
+    return textFlow.getText();
+}
+
+/**
+ * @see org.eclipse.swt.widgets.Canvas#setFont(org.eclipse.swt.graphics.Font)
+ */
+public void setFont(Font font) {
+    super.setFont(font);
+    textFlow.revalidate();
+}
+
+/**
+ * @param   image   The <code>Image</code> to be used for this label.  It can be
+ *                  <code>null</code>.
+ */
+public void setImage(Image image) {
+    this.image = image;
+    if (image !is null)
+        setBorder(new ImageBorder(image));
+    else
+        setBorder(null);
+}
+
+/**
+ * Sets the text for this label.
+ * @param text the new text
+ */
+public void setText(String text) {
+    textFlow.setText(text);
+}
+
+}