author | yan |
Mon, 14 Oct 2013 11:47:27 +0400 | |
changeset 21254 | f6d36ee3f269 |
parent 5506 | 202f599c92aa |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
2 | 1 |
<!-- |
5506 | 2 |
Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
||
5 |
This code is free software; you can redistribute it and/or modify it |
|
6 |
under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
published by the Free Software Foundation. Oracle designates this |
2 | 8 |
particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
|
11 |
This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
accompanied this code). |
|
16 |
||
17 |
You should have received a copy of the GNU General Public License version |
|
18 |
2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
||
5506 | 21 |
Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
or visit www.oracle.com if you need additional information or have any |
|
23 |
questions. |
|
2 | 24 |
--> |
25 |
||
26 |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
|
27 |
<html> |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
28 |
<head><title></title></head> |
2 | 29 |
<body bgcolor="white"> |
30 |
||
31 |
Drag and Drop is a direct manipulation gesture found in many Graphical |
|
32 |
User Interface systems that provides a mechanism to transfer |
|
33 |
information between two entities logically associated with presentation |
|
34 |
elements in the GUI. Normally driven by a physical gesture of a |
|
35 |
human user using an appropriate input device, Drag and Drop provides both |
|
36 |
a mechanism to enable continuous feedback regarding the |
|
37 |
possible outcome of any subsequent data transfer to the user during |
|
38 |
navigation over the presentation elements in the GUI, and the facilities |
|
39 |
to provide for any subsequent data negotiation and transfer. |
|
40 |
<P> |
|
41 |
This package defines the classes and interfaces necessary to perform Drag |
|
42 |
and Drop operations in Java. It |
|
43 |
defines classes for the drag-source and the drop-target, as well as |
|
44 |
events for transferring the data being dragged. This package also provides |
|
45 |
a means for giving visual feedback to the user throughout the |
|
46 |
duration of the Drag and Drop operation. |
|
47 |
<P> |
|
48 |
A typical Drag and Drop operation can be decomposed into the following |
|
49 |
states (not entirely sequentially): |
|
50 |
<UL> |
|
51 |
<LI>A <code>DragSource</code> comes into existence, |
|
52 |
associated with some presentation |
|
53 |
element (<code>Component</code>) in the GUI, to initiate a Drag and Drop of |
|
54 |
some potentially <code>Transferable</code> data. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
55 |
<br><br> |
2 | 56 |
<LI>1 or more <code>DropTarget</code>(s) come into/go out of |
57 |
existence, associated |
|
58 |
with presentation elements in the GUI (Components), potentially |
|
59 |
capable of consuming <code>Transferable</code> data types. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
60 |
<br><br> |
2 | 61 |
<LI> A <code>DragGestureRecognizer</code> is |
62 |
obtained from the <code>DragSource</code> and is |
|
63 |
associated with a <code>Component</code> in order |
|
64 |
to track and identify any Drag |
|
65 |
initiating gesture by the user over the <code>Component</code>. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
66 |
<br><br> |
2 | 67 |
<LI> A user makes a Drag gesture over the <code>Component</code>, |
68 |
which the registered |
|
69 |
<code>DragGestureRecognizer</code> detects, and notifies its |
|
70 |
<code>DragGestureListener</code> of. |
|
71 |
<P> |
|
72 |
Note: Although this API consistently refers to the stimulus for a |
|
73 |
drag and drop operation being a physical gesture by a human user, this |
|
74 |
does not preclude a programmatically driven DnD operation given the |
|
75 |
appropriate implementation of a <code>DragSource</code>. This package |
|
76 |
contains the abstract class <code>MouseDragGestureRecognizer</code> for |
|
77 |
recognizing mouse device gestures. Other abstract subclasses may be |
|
78 |
provided by the platform to support other input devices or |
|
79 |
particular <code>Component</code> class semantics. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
80 |
<br><br> |
2 | 81 |
<LI> The <code>DragGestureListener</code> causes the |
82 |
<code>DragSource</code> to initiate the Drag |
|
83 |
and Drop operation on behalf of the user, perhaps animating the |
|
84 |
GUI Cursor and/or rendering an <code>Image</code> of the item(s) that are the |
|
85 |
subject of the operation. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
86 |
<br><br> |
2 | 87 |
<LI> As the user gestures navigate over <code>Component</code>(s) |
88 |
in the GUI with |
|
89 |
associated <code>DropTarget</code>(s), the <code>DragSource</code> |
|
90 |
receives notifications in order |
|
91 |
to provide "Drag Over" feedback effects, and the <code>DropTarget</code>(s) |
|
92 |
receive notifications in order to provide "Drag Under" feedback effects |
|
93 |
based upon the operation(s) supported and the data type(s) involved. |
|
94 |
</UL> |
|
95 |
<P> |
|
96 |
||
97 |
The gesture itself moves a logical cursor across the GUI hierarchy, |
|
98 |
intersecting the geometry of GUI Component(s), possibly resulting in |
|
99 |
the logical "Drag" cursor entering, crossing, and subsequently |
|
100 |
leaving <code>Component</code>(s) and associated <code>DropTarget</code>(s). |
|
101 |
<P> |
|
102 |
The <code>DragSource</code> object manifests "Drag Over" feedback to the user, in the typical case by animating the GUI <code>Cursor</code> associated with the |
|
103 |
logical cursor. |
|
104 |
<P> |
|
105 |
<code>DropTarget</code> objects manifest "Drag Under" feedback to the user, in |
|
106 |
the typical case, by rendering animations into their associated GUI |
|
107 |
<code>Component</code>(s) under the GUI Cursor. |
|
108 |
<P> |
|
109 |
The determination of the feedback effects, and the ultimate success |
|
110 |
or failure of the data transfer, should one occur, is parameterized |
|
111 |
as follows: |
|
112 |
<UL> |
|
113 |
<LI> By the transfer "operation" selected by the user, and supported by |
|
114 |
both the <code>DragSource</code> and <code>DropTarget</code>: Copy, Move or Reference(link). |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
115 |
<br><br> |
2 | 116 |
<LI> By the intersection of the set of data types provided by the |
117 |
<code>DragSource</code> and the set of data types comprehensible by the |
|
118 |
<code>DropTarget</code>. |
|
21254
f6d36ee3f269
8025824: [cleanup] Fix tidy errors and warnings in preformatted HTML files related to 2d/awt/swing
yan
parents:
5506
diff
changeset
|
119 |
<br><br> |
2 | 120 |
<LI>When the user terminates the drag operation, normally resulting in a |
121 |
successful Drop, both the <code>DragSource</code> and <code>DropTarget</code> |
|
122 |
receive |
|
123 |
notifications that include, and result in the type negotiation and |
|
124 |
transfer of, the information associated with the <code>DragSource</code> via a |
|
125 |
<code>Transferable</code> object. |
|
126 |
</UL> |
|
127 |
||
128 |
<!-- |
|
129 |
<h2>Package Specification</h2> |
|
130 |
||
131 |
##### FILL IN ANY SPECS NEEDED BY JAVA COMPATIBILITY KIT ##### |
|
132 |
<ul> |
|
133 |
<li><a href="">##### REFER TO ANY FRAMEMAKER SPECIFICATION HERE #####</a> |
|
134 |
</ul> |
|
135 |
||
136 |
<h2>Related Documentation</h2> |
|
137 |
||
138 |
For overviews, tutorials, examples, guides, and tool documentation, please see: |
|
139 |
<ul> |
|
140 |
<li><a href="">##### REFER TO NON-SPEC DOCUMENTATION HERE #####</a> |
|
141 |
</ul> |
|
142 |
--> |
|
143 |
||
144 |
@since 1.2 |
|
145 |
</body> |
|
146 |
</html> |