summaryrefslogtreecommitdiffstats
path: root/toolkit/test/accessibility/Canvas.java
blob: e9149ff82e351a750455446695827da53c80ea8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
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;
}