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| -rw-r--r-- | toolkit/test/accessibility/Canvas.java | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/toolkit/test/accessibility/Canvas.java b/toolkit/test/accessibility/Canvas.java new file mode 100644 index 000000000..e9149ff82 --- /dev/null +++ b/toolkit/test/accessibility/Canvas.java @@ -0,0 +1,463 @@ +/* + * 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; +} |