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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
+import java.awt.Toolkit;
+import java.awt.event.InputEvent;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+import java.awt.geom.Rectangle2D;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTree;
+import javax.swing.JViewport;
+import javax.swing.event.TreeSelectionListener;
+import javax.swing.tree.TreePath;
+
+/** 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
+ <member>addAccessible</member> member function.
+
+ <p>The canvas listens to selection events of the associated JTree and
+ highlights the first selected node of that tree.</p>
+*/
+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<AccTreeNode, CanvasShape> ();
+ maNodes = new ArrayList<AccTreeNode> ();
+ maObjectList = new ArrayList<CanvasShape> ();
+ 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);
+ }
+
+ /** 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 = maObjects.get (aNode);
+ if (aObject == null)
+ {
+ aObject = new CanvasShape (aNode);
+ // Update bounding box that includes all objects.
+ if (maObjects.isEmpty())
+ 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 )
+ {
+ CanvasShape aObject = maObjects.get(aNode);
+ maObjectList.remove (aObject);
+ maObjects.remove (aNode);
+ maNodes.remove (aNode);
+ repaint ();
+ }
+ }
+
+ public void updateNode (AccTreeNode aNode)
+ {
+ int i = maNodes.indexOf (aNode);
+ if (i != -1)
+ {
+ CanvasShape aObject = maObjects.get(aNode);
+ if (aObject != null)
+ aObject.update();
+ }
+ }
+
+ public void updateNodeGeometry (AccTreeNode aNode)
+ {
+ CanvasShape aObject = maObjects.get(aNode);
+ if (aObject != null)
+ aObject.updateGeometry();
+ }
+
+ public void clear ()
+ {
+ while (maNodes.size() > 0) {
+ removeNode (maNodes.get(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");
+ }
+
+ private void setShowText (boolean bNewValue)
+ {
+ Options.SetBoolean ("ShowText", bNewValue);
+ repaint ();
+ }
+
+ public void setZoomMode (int nZoomMode)
+ {
+ Options.SetInteger ("ZoomMode", nZoomMode);
+ repaint ();
+ }
+
+ private int getZoomMode ()
+ {
+ return Options.GetInteger ("ZoomMode", WHOLE_SCREEN);
+ }
+
+
+ @Override
+ 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 around 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<nCount; i++)
+ {
+ CanvasShape aCanvasShape = maObjectList.get(i);
+ aCanvasShape.paint (
+ g2,
+ mnHOffset, mnVOffset, mnScale,
+ bShowDescriptions, bShowNames, bShowText);
+ }
+ }
+
+ // Paint highlighted frame around active object as the last thing.
+ if (maActiveObject != null)
+ maActiveObject.paint_highlight (
+ g2);
+ }
+ }
+
+
+
+
+ /** Set up the transformation so that the graphical display can show a
+ centered representation of the whole screen.
+ */
+ private void setupTransformation ()
+ {
+ // Turn off scrollbars when showing the whole screen. Otherwise show them when needed.
+ JViewport aViewport = (JViewport)getParent();
+ JScrollPane aScrollPane = (JScrollPane)aViewport.getParent();
+ int nZoomMode = getZoomMode();
+ if (nZoomMode == WHOLE_SCREEN)
+ {
+ if (aScrollPane.getHorizontalScrollBarPolicy()
+ != JScrollPane.HORIZONTAL_SCROLLBAR_NEVER)
+ aScrollPane.setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
+ if (aScrollPane.getVerticalScrollBarPolicy()
+ != JScrollPane.VERTICAL_SCROLLBAR_NEVER)
+ aScrollPane.setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_NEVER);
+ }
+ else
+ {
+ if (aScrollPane.getHorizontalScrollBarPolicy()
+ != JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED)
+ aScrollPane.setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+ if (aScrollPane.getVerticalScrollBarPolicy()
+ != JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED)
+ aScrollPane.setVerticalScrollBarPolicy (JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
+ }
+
+ Dimension aScreenSize = Toolkit.getDefaultToolkit().getScreenSize();
+ Dimension aWidgetSize = aViewport.getSize();
+ {
+ if ((aScreenSize.getWidth() > 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;
+ }
+ }
+ }
+
+
+
+ /** 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));
+ }
+
+ private CanvasShape FindCanvasShapeUnderMouse (MouseEvent e)
+ {
+ CanvasShape aObjectUnderMouse = null;
+ int nCount = maObjectList.size();
+ for (int i=nCount-1; i>=0; --i)
+ {
+ CanvasShape aObject = maObjectList.get(i);
+ if (aObject != null && aObject.contains (e.getX(),e.getY()))
+ {
+ aObjectUnderMouse = aObject;
+ break;
+ }
+ }
+ return aObjectUnderMouse;
+ }
+
+ private 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 = maObjects.get (aObject);
+ if (highlightObject (aCanvasShape))
+ repaint();
+ }
+ }
+
+ private double
+ mnHOffset,
+ mnVOffset,
+ mnScale;
+ private CanvasShape
+ maActiveObject;
+ private final java.util.HashMap<AccTreeNode, CanvasShape>
+ maObjects;
+ private final List<CanvasShape>
+ maObjectList;
+ private final List<AccTreeNode>
+ maNodes;
+ private Rectangle
+ maBoundingBox;
+ private JTree
+ maTree;
+}