import java.util.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.tree.*; import javax.swing.event.TreeSelectionListener; import javax.swing.event.TreeSelectionEvent; import java.awt.geom.Rectangle2D; import com.sun.star.accessibility.XAccessible; import com.sun.star.accessibility.XAccessibleContext; import com.sun.star.accessibility.XAccessibleComponent; /** This canvas displays accessible objects graphically. Each accessible object with graphical representation is represented by an CanvasShape object and has to be added by the addAccessible member function.

The canvas listens to selection events of the associated JTree and highlights the first selected node of that tree.

*/ class Canvas extends JPanel implements MouseListener, MouseMotionListener, TreeSelectionListener//, Scrollable { // This constant can be passed to SetZoomMode to always show the whole screen. public static final int WHOLE_SCREEN = -1; public Canvas () { super (true); maObjects = new java.util.HashMap (); maNodes = new Vector (); maObjectList = new Vector (); maContexts = new Vector (); addMouseListener (this); addMouseMotionListener (this); maBoundingBox = new Rectangle (0,0,100,100); maTree = null; mnHOffset = 0; mnVOffset = 0; mnScale = 1; setShowText(false); setShowDescriptions (true); setShowNames (true); setAntialiasing (true); maLastWidgetSize = new Dimension (0,0); } /** Tell the canvas which tree view to use to highlight accessible objects. */ public void setTree (JTree aTree) { if (maTree != null) maTree.removeTreeSelectionListener (this); maTree = aTree; if (maTree != null) maTree.addTreeSelectionListener (this); } public void addNode (AccTreeNode aNode) { if (maNodes.indexOf (aNode) == -1) { maNodes.add (aNode); CanvasShape aObject = (CanvasShape) maObjects.get (aNode); if (aObject == null) { aObject = new CanvasShape (aNode); // Update bounding box that includes all objects. if (maObjects.size() == 0) maBoundingBox = aObject.getBBox(); else maBoundingBox = maBoundingBox.union (aObject.getBBox()); maObjects.put (aNode, aObject); maObjectList.add (aObject); } repaint (); } } public void removeNode (AccTreeNode aNode) { int i = maNodes.indexOf (aNode); if( i != -1 ) { Object aObject = maObjects.get(aNode); maObjectList.remove (aObject); maObjects.remove (aObject); maNodes.remove (aNode); repaint (); } } public void updateNode (AccTreeNode aNode) { int i = maNodes.indexOf (aNode); if (i != -1) { CanvasShape aObject = (CanvasShape)maObjects.get(aNode); if (aObject != null) aObject.update(); } } public void updateNodeGeometry (AccTreeNode aNode) { CanvasShape aObject = (CanvasShape)maObjects.get(aNode); if (aObject != null) aObject.updateGeometry(); } public void clear () { while (maNodes.size() > 0) removeNode ((AccTreeNode)maNodes.elementAt(0)); maNodes.clear(); maObjects.clear(); maObjectList.clear(); } public boolean getShowDescriptions () { return Options.GetBoolean ("ShowDescriptions"); } public void setShowDescriptions (boolean bNewValue) { Options.SetBoolean ("ShowDescriptions", bNewValue); repaint (); } public boolean getShowNames () { return Options.GetBoolean ("ShowNames"); } public void setShowNames (boolean bNewValue) { Options.SetBoolean ("ShowNames", bNewValue); repaint (); } public boolean getAntialiasing () { return Options.GetBoolean ("Antialiasing"); } public void setAntialiasing (boolean bNewValue) { Options.SetBoolean ("Antialiasing", bNewValue); repaint (); } public boolean getShowText () { return Options.GetBoolean ("ShowText"); } public void setShowText (boolean bNewValue) { Options.SetBoolean ("ShowText", bNewValue); repaint (); } public void setZoomMode (int nZoomMode) { Options.SetInteger ("ZoomMode", nZoomMode); repaint (); } public int getZoomMode () { return Options.GetInteger ("ZoomMode", WHOLE_SCREEN); } public void paintComponent (Graphics g) { synchronized (g) { super.paintComponent (g); Graphics2D g2 = (Graphics2D)g; if (getAntialiasing()) g2.setRenderingHint (RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); else g2.setRenderingHint (RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF); setupTransformation (); // Draw the screen representation to give a hint of the location of the // accessible object on the screen. Dimension aScreenSize = Toolkit.getDefaultToolkit().getScreenSize(); Rectangle2D.Double aScreen = new Rectangle2D.Double ( mnHOffset, mnVOffset, mnScale*aScreenSize.getWidth(), mnScale*aScreenSize.getHeight()); // Fill the screen rectangle and draw a frame arround it to increase its visibility. g2.setColor (new Color (250,240,230)); g2.fill (aScreen); g2.setColor (Color.BLACK); g2.draw (aScreen); synchronized (maObjectList) { int nCount = maObjectList.size(); boolean bShowDescriptions = getShowDescriptions(); boolean bShowNames = getShowNames(); boolean bShowText = getShowText(); for (int i=0; i 0) && (aScreenSize.getHeight() > 0)) { if (nZoomMode == WHOLE_SCREEN) { // Calculate the scales that would map the screen onto the // widget in both of the coordinate axes and select the // smaller // of the two: it maps the screen onto the widget in both // axes at the same time. double nHScale = (aWidgetSize.getWidth() - 10) / aScreenSize.getWidth(); double nVScale = (aWidgetSize.getHeight() - 10) / aScreenSize.getHeight(); if (nHScale < nVScale) mnScale = nHScale; else mnScale = nVScale; } else { mnScale = nZoomMode / 100.0; } // Calculate offsets that center the scaled screen inside the widget. mnHOffset = (aWidgetSize.getWidth() - mnScale*aScreenSize.getWidth()) / 2.0; mnVOffset = (aWidgetSize.getHeight() - mnScale*aScreenSize.getHeight()) / 2.0; if (mnHOffset < 0) mnHOffset = 0; if (mnVOffset < 0) mnVOffset = 0; setPreferredSize (new Dimension ( (int)(2*mnHOffset + mnScale * aScreenSize.getWidth()), (int)(2*mnVOffset + mnScale * aScreenSize.getHeight()))); revalidate (); } else { // In case of a degenerate (not yet initialized?) screen size // use some meaningless default values. mnScale = 1; mnHOffset = 0; mnVOffset = 0; } } maLastWidgetSize = aWidgetSize; } /** Call getAccessibleAt to determine accessible object under mouse. */ public void mouseClicked (MouseEvent e) { } public void mousePressed (MouseEvent e) { CanvasShape aObjectUnderMouse = FindCanvasShapeUnderMouse (e); highlightObject (aObjectUnderMouse); if ((e.getModifiers() & InputEvent.CTRL_MASK) != 0) { maTree.expandPath (aObjectUnderMouse.getPath()); } } public void mouseReleased (MouseEvent e) { } public void mouseEntered (MouseEvent e) { } public void mouseExited (MouseEvent e) { // Deselect currently active object. if (maActiveObject != null) { maActiveObject.unhighlight (); maActiveObject = null; repaint (); } } public void mouseDragged (MouseEvent e) { } public void mouseMoved (MouseEvent e) { if ((e.getModifiers() & InputEvent.SHIFT_MASK) != 0) highlightObject (FindCanvasShapeUnderMouse (e)); } protected CanvasShape FindCanvasShapeUnderMouse (MouseEvent e) { int nObjects = maObjects.size(); CanvasShape aObjectUnderMouse = null; int nCount = maObjectList.size(); for (int i=nCount-1; i>=0; --i) { CanvasShape aObject = (CanvasShape)maObjectList.elementAt(i); if (aObject != null) if (aObject.contains (e.getX(),e.getY())) { aObjectUnderMouse = aObject; break; } } return aObjectUnderMouse; } protected boolean highlightObject (CanvasShape aNewActiveObject) { if (aNewActiveObject != maActiveObject) { if (maActiveObject != null) maActiveObject.unhighlight(); maActiveObject = aNewActiveObject; if (maActiveObject != null) { if (maTree != null) { maTree.scrollPathToVisible (maActiveObject.getPath()); maTree.setSelectionPath (maActiveObject.getPath()); maTree.repaint (); } maActiveObject.highlight (); repaint (); } return true; } else return false; } /** Called when the selection of the tree changes. Highlight the corresponding graphical representation of the first selected object. */ public void valueChanged (javax.swing.event.TreeSelectionEvent event) { TreePath aPath = event.getPath(); Object aObject = aPath.getLastPathComponent(); if (aObject instanceof AccTreeNode) { CanvasShape aCanvasShape = (CanvasShape)maObjects.get ((AccTreeNode)aObject); if (highlightObject (aCanvasShape)) repaint(); } } private int mnXAnchor, mnYAnchor, maResizeFlag; private double mnHOffset, mnVOffset, mnScale; private CanvasShape maActiveObject; private java.util.HashMap maObjects; private Vector maObjectList, maContexts, maNodes; private Rectangle maBoundingBox; private JTree maTree; // The size of the widget at the last call of setupTransformation() private Dimension maLastWidgetSize; }