| /******************************************************************************* |
| * Copyright (c) 2001, 2004 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.wst.wsdl.ui.internal.graph; |
| |
| import org.eclipse.draw2d.FigureCanvas; |
| import org.eclipse.draw2d.RangeModel; |
| import org.eclipse.draw2d.geometry.Point; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.KeyAdapter; |
| import org.eclipse.swt.events.KeyEvent; |
| import org.eclipse.swt.graphics.Rectangle; |
| import org.eclipse.swt.widgets.Widget; |
| |
| public class FigureCanvasKeyboardHandler extends KeyAdapter |
| { |
| public static final int H_SCROLL_INCREMENT = 5; |
| public static final int V_SCROLL_INCREMENT = 30; |
| |
| /** |
| * Constructor for FigureCanvasKeyboardHandler. |
| */ |
| public FigureCanvasKeyboardHandler() |
| { |
| super(); |
| } |
| |
| public void keyPressed(KeyEvent e) |
| { |
| Widget w = e.widget; |
| if (w instanceof FigureCanvas) |
| { |
| processKey(e.keyCode, (FigureCanvas)w); |
| } |
| } |
| |
| private void processKey(int keyCode, FigureCanvas figureCanvas) |
| { |
| switch (keyCode) |
| { |
| case SWT.ARROW_DOWN : |
| scrollVertical(figureCanvas, false); |
| break; |
| case SWT.ARROW_UP : |
| scrollVertical(figureCanvas, true); |
| break; |
| case SWT.ARROW_LEFT : |
| scrollHorizontal(figureCanvas, true); |
| break; |
| case SWT.ARROW_RIGHT : |
| scrollHorizontal(figureCanvas, false); |
| break; |
| case SWT.PAGE_UP : |
| scrollPage(figureCanvas, true); |
| break; |
| case SWT.PAGE_DOWN : |
| scrollPage(figureCanvas, false); |
| break; |
| } |
| } |
| |
| private int verifyScrollBarOffset(RangeModel model, int value) |
| { |
| value = Math.max(model.getMinimum(), value); |
| return Math.min(model.getMaximum() - model.getExtent(), value); |
| } |
| |
| private void scrollVertical(FigureCanvas figureCanvas, boolean up) |
| { |
| Point location = figureCanvas.getViewport().getViewLocation(); |
| int vOffset = up ? -V_SCROLL_INCREMENT : V_SCROLL_INCREMENT; |
| int x = verifyScrollBarOffset(figureCanvas.getViewport().getHorizontalRangeModel(), location.x); |
| int y = verifyScrollBarOffset(figureCanvas.getViewport().getVerticalRangeModel(), location.y + vOffset); |
| figureCanvas.scrollSmoothTo(x, y); |
| } |
| |
| private void scrollHorizontal(FigureCanvas figureCanvas, boolean left) |
| { |
| Point location = figureCanvas.getViewport().getViewLocation(); |
| int hOffset = left ? -H_SCROLL_INCREMENT : H_SCROLL_INCREMENT; |
| int x = verifyScrollBarOffset(figureCanvas.getViewport().getHorizontalRangeModel(), location.x + hOffset); |
| int y = verifyScrollBarOffset(figureCanvas.getViewport().getVerticalRangeModel(), location.y); |
| figureCanvas.scrollSmoothTo(x, y); |
| } |
| |
| private void scrollPage(FigureCanvas figureCanvas, boolean up) |
| { |
| Rectangle clientArea = figureCanvas.getClientArea(); |
| int increment = up ? -clientArea.height : clientArea.height; |
| Point location = figureCanvas.getViewport().getViewLocation(); |
| int x = verifyScrollBarOffset(figureCanvas.getViewport().getHorizontalRangeModel(), location.x); |
| int y = verifyScrollBarOffset(figureCanvas.getViewport().getVerticalRangeModel(), location.y + increment); |
| figureCanvas.scrollSmoothTo(x, y); |
| } |
| } |