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LayoutReloadMonitor.javaAPI DocAndroid 1.5 API8455Wed May 06 22:41:10 BST 2009com.android.ide.eclipse.editors.layout

LayoutReloadMonitor

public final class LayoutReloadMonitor extends Object implements com.android.ide.eclipse.editors.resources.manager.ResourceMonitor.IFileListener, com.android.ide.eclipse.editors.resources.manager.ResourceMonitor.IResourceEventListener
Monitor for file changes triggering a layout redraw.

Fields Summary
private static final LayoutReloadMonitor
sThis
private final Map
mListenerMap
Map of listeners by IProject.
private static final int
CHANGE_CODE
private static final int
CHANGE_RESOURCES
private static final int
CHANGE_R
private static final int
CHANGE_COUNT
private final Map
mChangedProjects
List of projects having received a file change. the boolean[] contains 3 values:
  • CHANGE_CODE: code change flag.
  • CHANGE_RESOURCES: resource change flag.
  • CHANGE_R: R clas change flag
Constructors Summary
private LayoutReloadMonitor()

        ResourceMonitor monitor = ResourceMonitor.getMonitor();
        monitor.addFileListener(this, IResourceDelta.ADDED | IResourceDelta.CHANGED);
        monitor.addResourceEventListener(this);
Methods Summary
public voidaddListener(org.eclipse.core.resources.IProject project, com.android.ide.eclipse.editors.layout.LayoutReloadMonitor$ILayoutReloadListener listener)
Adds a listener for a given {@link IProject}.

param
project
param
listener

        synchronized (mListenerMap) {
            List<ILayoutReloadListener> list = mListenerMap.get(project);
            if (list == null) {
                list = new ArrayList<ILayoutReloadListener>();
                mListenerMap.put(project, list);
            }
            
            list.add(listener);
        }
public voidfileChanged(org.eclipse.core.resources.IFile file, org.eclipse.core.resources.IMarkerDelta[] markerDeltas, int kind)

        // get the file project
        IProject project = file.getProject();

        // if this project has already been marked as modified, we do nothing.
        boolean[] changeFlags = mChangedProjects.get(project);
        if (changeFlags != null && changeFlags[CHANGE_CODE] && changeFlags[CHANGE_RESOURCES] &&
                changeFlags[CHANGE_R]) {
            return;
        }
        
        // now check that the file is *NOT* a layout file (those automatically trigger a layout
        // reload and we don't want to do it twice.
        ResourceFolder resFolder = ResourceManager.getInstance().getResourceFolder(file);
        if (resFolder != null) {
            if (resFolder.getType() != ResourceFolderType.LAYOUT) {
                // this is a resource change!
                if (changeFlags == null) {
                    changeFlags = new boolean[CHANGE_COUNT];
                    mChangedProjects.put(project, changeFlags);
                }
    
                changeFlags[CHANGE_RESOURCES] = true;
            }
        } else if (AndroidConstants.EXT_CLASS.equals(file.getFileExtension())) {
            if (file.getName().matches("R[\\$\\.](.*)")) {
                // this is a R change!
                if (changeFlags == null) {
                    changeFlags = new boolean[CHANGE_COUNT];
                    mChangedProjects.put(project, changeFlags);
                }

                changeFlags[CHANGE_R] = true;
            } else {
                // this is a code change!
                if (changeFlags == null) {
                    changeFlags = new boolean[CHANGE_COUNT];
                    mChangedProjects.put(project, changeFlags);
                }

                changeFlags[CHANGE_CODE] = true;
            }
        }
public static com.android.ide.eclipse.editors.layout.LayoutReloadMonitorgetMonitor()
Returns the single instance of {@link LayoutReloadMonitor}.

    
                          
       
                                                          
               
    
    
                
        
        return sThis;
public voidremoveListener(org.eclipse.core.resources.IProject project, com.android.ide.eclipse.editors.layout.LayoutReloadMonitor$ILayoutReloadListener listener)
Removes a listener for a given {@link IProject}.

param
project
param
listener

        synchronized (mListenerMap) {
            List<ILayoutReloadListener> list = mListenerMap.get(project);
            if (list != null) {
                list.remove(listener);
            }
        }
public voidresourceChangeEventEnd()

        // for each IProject that was changed, we notify all the listeners.
        synchronized (mListenerMap) {
            for (Entry<IProject, boolean[]> project : mChangedProjects.entrySet()) {
                List<ILayoutReloadListener> listeners = mListenerMap.get(project.getKey());
                
                boolean[] flags = project.getValue();
                
                if (listeners != null) {
                    for (ILayoutReloadListener listener : listeners) {
                        listener.reloadLayout(flags[CHANGE_CODE], flags[CHANGE_R],
                                flags[CHANGE_RESOURCES]);
                    }
                }
            }
        }
        
        // empty the list.
        mChangedProjects.clear();
public voidresourceChangeEventStart()

        // nothing to be done here, it all happens in the resourceChangeEventEnd