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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
*******************************************************************************/
package org.eclipse.swt.examples.fileviewer;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.program.*;
import org.eclipse.swt.widgets.*;
import java.io.*;
import java.util.*;
/**
* Manages icons for the application.
* This is necessary as we could easily end up creating thousands of icons
* bearing the same image.
*/
class IconCache {
// Stock images
public final int
shellIcon = 0,
iconClosedDrive = 1,
iconClosedFolder = 2,
iconFile = 3,
iconOpenDrive = 4,
iconOpenFolder = 5,
cmdCopy = 6,
cmdCut = 7,
cmdDelete = 8,
cmdParent = 9,
cmdPaste = 10,
cmdPrint = 11,
cmdRefresh = 12,
cmdRename = 13,
cmdSearch = 14;
public final String[] stockImageLocations = {
"generic_example.gif",
"icon_ClosedDrive.gif",
"icon_ClosedFolder.gif",
"icon_File.gif",
"icon_OpenDrive.gif",
"icon_OpenFolder.gif",
"cmd_Copy.gif",
"cmd_Cut.gif",
"cmd_Delete.gif",
"cmd_Parent.gif",
"cmd_Paste.gif",
"cmd_Print.gif",
"cmd_Refresh.gif",
"cmd_Rename.gif",
"cmd_Search.gif"
};
public Image stockImages[];
// Stock cursors
public final int
cursorDefault = 0,
cursorWait = 1;
public Cursor stockCursors[];
// Cached icons
private Hashtable iconCache; /* map Program to Image */
public IconCache() {
}
/**
* Loads the resources
*
* @param display the display
*/
public void initResources(Display display) {
if (stockImages == null) {
stockImages = new Image[stockImageLocations.length];
for (int i = 0; i < stockImageLocations.length; ++i) {
Image image = createStockImage(display, stockImageLocations[i]);
if (image == null) {
freeResources();
throw new IllegalStateException(
FileViewer.getResourceString("error.CouldNotLoadResources"));
}
stockImages[i] = image;
}
}
if (stockCursors == null) {
stockCursors = new Cursor[] {
null,
display.getSystemCursor(SWT.CURSOR_WAIT)
};
}
iconCache = new Hashtable();
}
/**
* Frees the resources
*/
public void freeResources() {
if (stockImages != null) {
for (int i = 0; i < stockImages.length; ++i) {
final Image image = stockImages[i];
if (image != null) image.dispose();
}
stockImages = null;
}
if (iconCache != null) {
for (Enumeration it = iconCache.elements(); it.hasMoreElements(); ) {
Image image = (Image) it.nextElement();
image.dispose();
}
}
stockCursors = null;
}
/**
* Creates a stock image
*
* @param display the display
* @param path the relative path to the icon
*/
private Image createStockImage(Display display, String path) {
InputStream stream = IconCache.class.getResourceAsStream (path);
ImageData imageData = new ImageData (stream);
ImageData mask = imageData.getTransparencyMask ();
Image result = new Image (display, imageData, mask);
try {
stream.close ();
} catch (IOException e) {
e.printStackTrace ();
}
return result;
}
/**
* Gets an image for a file associated with a given program
*
* @param program the Program
*/
public Image getIconFromProgram(Program program) {
Image image = (Image) iconCache.get(program);
if (image == null) {
ImageData imageData = program.getImageData();
if (imageData != null) {
image = new Image(null, imageData, imageData.getTransparencyMask());
iconCache.put(program, image);
} else {
image = stockImages[iconFile];
}
}
return image;
}
}
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