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GP-1634 Fix GhidraFileChooser dialog redraw lag spikes on Windows

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When resizing the dialog, calls to the OS's geFileIcon take long
enough to cause lag spikes and redraw issues (depending on the
number of files in the directory).

This change caches the icons.
This commit is contained in:
dev747368
2021-12-29 14:33:19 -05:00
parent 436bb4873e
commit 3bd77e9783
1 changed files with 31 additions and 12 deletions
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Ghidra/Framework/Docking/src/main/java/docking/widgets/filechooser/LocalFileChooserModel.java
+31 -12
View File
@@ -15,11 +15,12 @@
*/
package docking.widgets.filechooser;
import java.io.File;
import java.io.FileFilter;
import java.util.HashMap;
import java.util.Map;
import java.io.File;
import java.io.FileFilter;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.filechooser.FileSystemView;
@@ -40,6 +41,16 @@ public class LocalFileChooserModel implements GhidraFileChooserModel {
private FileSystemView fsView = FileSystemView.getFileSystemView();
private Map<File, String> rootDescripMap = new HashMap<>();
private Map<File, Icon> rootIconMap = new HashMap<>();
/**
* This is a cache of file icons, as returned from the OS's file icon service.
* <p>
* This cache is cleared each time a directory is requested (via {@link #getListing(File, FileFilter)}
* so that any changes to a file's icon are visible the next time the user hits
* refresh or navigates into a directory.
*/
private Map<File, Icon> fileIconMap = new HashMap<>();
private File[] roots = new File[0];
private GhidraFileChooserListener listener;
@@ -176,6 +187,11 @@ public class LocalFileChooserModel implements GhidraFileChooserModel {
*/
@Override
public File[] getListing(File directory, final FileFilter filter) {
// This clears the previously cached icons and avoids issues with modifying the map
// while its being used by other methods by throwing away the instance and allocating
// a new one.
fileIconMap = new HashMap<>();
if (directory == null) {
return new File[0];
}
@@ -188,18 +204,21 @@ public class LocalFileChooserModel implements GhidraFileChooserModel {
*/
@Override
public Icon getIcon(File file) {
if (rootIconMap.containsKey(file)) {
return rootIconMap.get(file);
Icon result = rootIconMap.get(file);
if (result == null && file != null && file.exists()) {
result = fileIconMap.computeIfAbsent(file, this::getSystemIcon);
}
if (file != null && file.exists()) {
try {
return fsView.getSystemIcon(file);
}
catch (Exception e) {
// ignore, fall thru
}
return (result != null) ? result : PROBLEM_FILE_ICON;
}
private Icon getSystemIcon(File file) {
try {
return fsView.getSystemIcon(file);
}
return PROBLEM_FILE_ICON;
catch (Exception e) {
// ignore, return null
}
return null;
}
/**