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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/java/awt/dnd/DragSourceDragEvent.java (1 of 18352 files). Show all

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1+/*
2+ * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
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
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
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+ *
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.
24+ */
25+
26+package java.awt.dnd;
27+
28+import java.awt.event.InputEvent;
29+
30+/**
31+ * The <code>DragSourceDragEvent</code> is
32+ * delivered from the <code>DragSourceContextPeer</code>,
33+ * via the <code>DragSourceContext</code>, to the <code>DragSourceListener</code>
34+ * registered with that <code>DragSourceContext</code> and with its associated
35+ * <code>DragSource</code>.
36+ * <p>
37+ * The <code>DragSourceDragEvent</code> reports the <i>target drop action</i>
38+ * and the <i>user drop action</i> that reflect the current state of
39+ * the drag operation.
40+ * <p>
41+ * <i>Target drop action</i> is one of <code>DnDConstants</code> that represents
42+ * the drop action selected by the current drop target if this drop action is
43+ * supported by the drag source or <code>DnDConstants.ACTION_NONE</code> if this
44+ * drop action is not supported by the drag source.
45+ * <p>
46+ * <i>User drop action</i> depends on the drop actions supported by the drag
47+ * source and the drop action selected by the user. The user can select a drop
48+ * action by pressing modifier keys during the drag operation:
49+ * <pre>
50+ * Ctrl + Shift -> ACTION_LINK
51+ * Ctrl -> ACTION_COPY
52+ * Shift -> ACTION_MOVE
53+ * </pre>
54+ * If the user selects a drop action, the <i>user drop action</i> is one of
55+ * <code>DnDConstants</code> that represents the selected drop action if this
56+ * drop action is supported by the drag source or
57+ * <code>DnDConstants.ACTION_NONE</code> if this drop action is not supported
58+ * by the drag source.
59+ * <p>
60+ * If the user doesn't select a drop action, the set of
61+ * <code>DnDConstants</code> that represents the set of drop actions supported
62+ * by the drag source is searched for <code>DnDConstants.ACTION_MOVE</code>,
63+ * then for <code>DnDConstants.ACTION_COPY</code>, then for
64+ * <code>DnDConstants.ACTION_LINK</code> and the <i>user drop action</i> is the
65+ * first constant found. If no constant is found the <i>user drop action</i>
66+ * is <code>DnDConstants.ACTION_NONE</code>.
67+ *
68+ * @since 1.2
69+ *
70+ */
71+
72+public class DragSourceDragEvent extends DragSourceEvent {
73+
74+ private static final long serialVersionUID = 481346297933902471L;
75+
76+ /**
77+ * Constructs a <code>DragSourceDragEvent</code>.
78+ * This class is typically
79+ * instantiated by the <code>DragSourceContextPeer</code>
80+ * rather than directly
81+ * by client code.
82+ * The coordinates for this <code>DragSourceDragEvent</code>
83+ * are not specified, so <code>getLocation</code> will return
84+ * <code>null</code> for this event.
85+ * <p>
86+ * The arguments <code>dropAction</code> and <code>action</code> should
87+ * be one of <code>DnDConstants</code> that represents a single action.
88+ * The argument <code>modifiers</code> should be either a bitwise mask
89+ * of old <code>java.awt.event.InputEvent.*_MASK</code> constants or a
90+ * bitwise mask of extended <code>java.awt.event.InputEvent.*_DOWN_MASK</code>
91+ * constants.
92+ * This constructor does not throw any exception for invalid <code>dropAction</code>,
93+ * <code>action</code> and <code>modifiers</code>.
94+ *
95+ * @param dsc the <code>DragSourceContext</code> that is to manage
96+ * notifications for this event.
97+ * @param dropAction the user drop action.
98+ * @param action the target drop action.
99+ * @param modifiers the modifier keys down during event (shift, ctrl,
100+ * alt, meta)
101+ * Either extended _DOWN_MASK or old _MASK modifiers
102+ * should be used, but both models should not be mixed
103+ * in one event. Use of the extended modifiers is
104+ * preferred.
105+ *
106+ * @throws <code>IllegalArgumentException</code> if <code>dsc</code> is <code>null</code>.
107+ *
108+ * @see java.awt.event.InputEvent
109+ * @see DragSourceEvent#getLocation
110+ */
111+
112+ public DragSourceDragEvent(DragSourceContext dsc, int dropAction,
113+ int action, int modifiers) {
114+ super(dsc);
115+
116+ targetActions = action;
117+ gestureModifiers = modifiers;
118+ this.dropAction = dropAction;
119+ if ((modifiers & ~(JDK_1_3_MODIFIERS | JDK_1_4_MODIFIERS)) != 0) {
120+ invalidModifiers = true;
121+ } else if ((getGestureModifiers() != 0) && (getGestureModifiersEx() == 0)) {
122+ setNewModifiers();
123+ } else if ((getGestureModifiers() == 0) && (getGestureModifiersEx() != 0)) {
124+ setOldModifiers();
125+ } else {
126+ invalidModifiers = true;
127+ }
128+ }
129+
130+ /**
131+ * Constructs a <code>DragSourceDragEvent</code> given the specified
132+ * <code>DragSourceContext</code>, user drop action, target drop action,
133+ * modifiers and coordinates.
134+ * <p>
135+ * The arguments <code>dropAction</code> and <code>action</code> should
136+ * be one of <code>DnDConstants</code> that represents a single action.
137+ * The argument <code>modifiers</code> should be either a bitwise mask
138+ * of old <code>java.awt.event.InputEvent.*_MASK</code> constants or a
139+ * bitwise mask of extended <code>java.awt.event.InputEvent.*_DOWN_MASK</code>
140+ * constants.
141+ * This constructor does not throw any exception for invalid <code>dropAction</code>,
142+ * <code>action</code> and <code>modifiers</code>.
143+ *
144+ * @param dsc the <code>DragSourceContext</code> associated with this
145+ * event.
146+ * @param dropAction the user drop action.
147+ * @param action the target drop action.
148+ * @param modifiers the modifier keys down during event (shift, ctrl,
149+ * alt, meta)
150+ * Either extended _DOWN_MASK or old _MASK modifiers
151+ * should be used, but both models should not be mixed
152+ * in one event. Use of the extended modifiers is
153+ * preferred.
154+ * @param x the horizontal coordinate for the cursor location
155+ * @param y the vertical coordinate for the cursor location
156+ *
157+ * @throws <code>IllegalArgumentException</code> if <code>dsc</code> is <code>null</code>.
158+ *
159+ * @see java.awt.event.InputEvent
160+ * @since 1.4
161+ */
162+ public DragSourceDragEvent(DragSourceContext dsc, int dropAction,
163+ int action, int modifiers, int x, int y) {
164+ super(dsc, x, y);
165+
166+ targetActions = action;
167+ gestureModifiers = modifiers;
168+ this.dropAction = dropAction;
169+ if ((modifiers & ~(JDK_1_3_MODIFIERS | JDK_1_4_MODIFIERS)) != 0) {
170+ invalidModifiers = true;
171+ } else if ((getGestureModifiers() != 0) && (getGestureModifiersEx() == 0)) {
172+ setNewModifiers();
173+ } else if ((getGestureModifiers() == 0) && (getGestureModifiersEx() != 0)) {
174+ setOldModifiers();
175+ } else {
176+ invalidModifiers = true;
177+ }
178+ }
179+
180+ /**
181+ * This method returns the target drop action.
182+ *
183+ * @return the target drop action.
184+ */
185+ public int getTargetActions() {
186+ return targetActions;
187+ }
188+
189+
190+ private static final int JDK_1_3_MODIFIERS = InputEvent.SHIFT_DOWN_MASK - 1;
191+ private static final int JDK_1_4_MODIFIERS =
192+ ((InputEvent.ALT_GRAPH_DOWN_MASK << 1) - 1) & ~JDK_1_3_MODIFIERS;
193+
194+ /**
195+ * This method returns an <code>int</code> representing
196+ * the current state of the input device modifiers
197+ * associated with the user's gesture. Typically these
198+ * would be mouse buttons or keyboard modifiers.
199+ * <P>
200+ * If the <code>modifiers</code> passed to the constructor
201+ * are invalid, this method returns them unchanged.
202+ *
203+ * @return the current state of the input device modifiers
204+ */
205+
206+ public int getGestureModifiers() {
207+ return invalidModifiers ? gestureModifiers : gestureModifiers & JDK_1_3_MODIFIERS;
208+ }
209+
210+ /**
211+ * This method returns an <code>int</code> representing
212+ * the current state of the input device extended modifiers
213+ * associated with the user's gesture.
214+ * See {@link InputEvent#getModifiersEx}
215+ * <P>
216+ * If the <code>modifiers</code> passed to the constructor
217+ * are invalid, this method returns them unchanged.
218+ *
219+ * @return the current state of the input device extended modifiers
220+ * @since 1.4
221+ */
222+
223+ public int getGestureModifiersEx() {
224+ return invalidModifiers ? gestureModifiers : gestureModifiers & JDK_1_4_MODIFIERS;
225+ }
226+
227+ /**
228+ * This method returns the user drop action.
229+ *
230+ * @return the user drop action.
231+ */
232+ public int getUserAction() { return dropAction; }
233+
234+ /**
235+ * This method returns the logical intersection of
236+ * the target drop action and the set of drop actions supported by
237+ * the drag source.
238+ *
239+ * @return the logical intersection of the target drop action and
240+ * the set of drop actions supported by the drag source.
241+ */
242+ public int getDropAction() {
243+ return targetActions & getDragSourceContext().getSourceActions();
244+ }
245+
246+ /*
247+ * fields
248+ */
249+
250+ /**
251+ * The target drop action.
252+ *
253+ * @serial
254+ */
255+ private int targetActions = DnDConstants.ACTION_NONE;
256+
257+ /**
258+ * The user drop action.
259+ *
260+ * @serial
261+ */
262+ private int dropAction = DnDConstants.ACTION_NONE;
263+
264+ /**
265+ * The state of the input device modifiers associated with the user
266+ * gesture.
267+ *
268+ * @serial
269+ */
270+ private int gestureModifiers = 0;
271+
272+ /**
273+ * Indicates whether the <code>gestureModifiers</code> are invalid.
274+ *
275+ * @serial
276+ */
277+ private boolean invalidModifiers;
278+
279+ /**
280+ * Sets new modifiers by the old ones.
281+ * The mouse modifiers have higher priority than overlaying key
282+ * modifiers.
283+ */
284+ private void setNewModifiers() {
285+ if ((gestureModifiers & InputEvent.BUTTON1_MASK) != 0) {
286+ gestureModifiers |= InputEvent.BUTTON1_DOWN_MASK;
287+ }
288+ if ((gestureModifiers & InputEvent.BUTTON2_MASK) != 0) {
289+ gestureModifiers |= InputEvent.BUTTON2_DOWN_MASK;
290+ }
291+ if ((gestureModifiers & InputEvent.BUTTON3_MASK) != 0) {
292+ gestureModifiers |= InputEvent.BUTTON3_DOWN_MASK;
293+ }
294+ if ((gestureModifiers & InputEvent.SHIFT_MASK) != 0) {
295+ gestureModifiers |= InputEvent.SHIFT_DOWN_MASK;
296+ }
297+ if ((gestureModifiers & InputEvent.CTRL_MASK) != 0) {
298+ gestureModifiers |= InputEvent.CTRL_DOWN_MASK;
299+ }
300+ if ((gestureModifiers & InputEvent.ALT_GRAPH_MASK) != 0) {
301+ gestureModifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
302+ }
303+ }
304+
305+ /**
306+ * Sets old modifiers by the new ones.
307+ */
308+ private void setOldModifiers() {
309+ if ((gestureModifiers & InputEvent.BUTTON1_DOWN_MASK) != 0) {
310+ gestureModifiers |= InputEvent.BUTTON1_MASK;
311+ }
312+ if ((gestureModifiers & InputEvent.BUTTON2_DOWN_MASK) != 0) {
313+ gestureModifiers |= InputEvent.BUTTON2_MASK;
314+ }
315+ if ((gestureModifiers & InputEvent.BUTTON3_DOWN_MASK) != 0) {
316+ gestureModifiers |= InputEvent.BUTTON3_MASK;
317+ }
318+ if ((gestureModifiers & InputEvent.SHIFT_DOWN_MASK) != 0) {
319+ gestureModifiers |= InputEvent.SHIFT_MASK;
320+ }
321+ if ((gestureModifiers & InputEvent.CTRL_DOWN_MASK) != 0) {
322+ gestureModifiers |= InputEvent.CTRL_MASK;
323+ }
324+ if ((gestureModifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) {
325+ gestureModifiers |= InputEvent.ALT_GRAPH_MASK;
326+ }
327+ }
328+}

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