diff options
Diffstat (limited to 'examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/fileviewer/IconCache.java')
| -rwxr-xr-x | examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/fileviewer/IconCache.java | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/fileviewer/IconCache.java b/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/fileviewer/IconCache.java new file mode 100755 index 0000000000..7abaaf540a --- /dev/null +++ b/examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/fileviewer/IconCache.java @@ -0,0 +1,149 @@ +package org.eclipse.swt.examples.fileviewer;
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved
+ */
+
+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.
+ */
+/* package */ class IconCache {
+ // Stock images
+ public static 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 static 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 static Image stockImages[];
+
+ // Stock cursors
+ public static final int
+ cursorDefault = 0,
+ cursorWait = 1;
+ public static Cursor stockCursors[];
+ // Cached icons
+ private static Hashtable iconCache;
+ /**
+ * Loads the resources
+ *
+ * @param display the display
+ */
+ public static 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,
+ new Cursor(display, SWT.CURSOR_WAIT)
+ };
+ }
+ iconCache = new Hashtable();
+ }
+ /**
+ * Frees the resources
+ */
+ public static 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();
+ }
+ }
+ }
+ /**
+ * Creates a stock image
+ *
+ * @param display the display
+ * @param path the relative path to the icon
+ */
+ private static Image createStockImage(Display display, String path) {
+ try {
+ InputStream stream = IconCache.class.getResourceAsStream(path);
+ if (stream != null) {
+ ImageData imageData = new ImageData(stream);
+ if (imageData != null) {
+ ImageData mask = imageData.getTransparencyMask();
+ return new Image(display, imageData, mask);
+ }
+ }
+ } catch (Exception e) {
+ }
+ return null;
+ }
+ /**
+ * Gets an image for a file associated with a given program and extension
+ *
+ * @param program the Program
+ * @param extension the extension
+ */
+ public static Image getIconFromProgram(Program program, String extension) {
+ final String key = program.getName() + "$#$" + extension;
+ Image image = (Image) iconCache.get(key);
+ if (image == null) {
+ ImageData imageData = program.getImageData();
+ if (imageData != null) {
+ image = new Image(null, imageData, imageData.getTransparencyMask());
+ iconCache.put(key, image);
+ } else {
+ image = stockImages[iconFile];
+ }
+ }
+ return image;
+ }
+}
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