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Diff Revisions 948 vs 950 for /trunk/Java/GWT/Client/src/org/litesoft/GWT/client/widgets/nonpublic/external/DragThresholdFilter.java

		@@ -1,78 +1,78 @@
1		-	// This Source Code is Copyright & Licenced as indicated below
2		-	package org.litesoft.GWT.client.widgets.nonpublic.external;
3		-	/*
4		-	* Copyright 2007 Mat Gessel <mat.gessel@gmail.com>
5		-	*
6		-	* Licensed under the Apache License, Version 2.0 (the "License"); you may not
7		-	* use this file except in compliance with the License. You may obtain a copy of
8		-	* the License at
9		-	*
10		-	* http://www.apache.org/licenses/LICENSE-2.0
11		-	*
12		-	* Unless required by applicable law or agreed to in writing, software
13		-	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
14		-	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
15		-	* License for the specific language governing permissions and limitations under
16		-	* the License.
17		-	*/
18		-
19		-	/**
20		-	* A DragGesture wrapper which prevents the wrapped gesture's step action
21		-	* from occuring until a specified distance is exceeded. This can be used to
22		-	* prevent accidental manipulation or to pervent the wrapped gesture's start
23		-	* action from being executed until the mouse is moved.
24		-	*/
25		-	public class DragThresholdFilter extends DragGestureWrapper {
26		-	private final int m_threshold;
27		-
28		-	private MouseEvent m_start;
29		-	private boolean m_started = false;
30		-
31		-	/**
32		-	* Creates a new DragGesture with the specified threshold.
33		-	*
34		-	* @param distance the distance in screen pixels to move before taking an
35		-	* action, or <code>0</code>
36		-	*/
37		-	public DragThresholdFilter( int distance, DragGesture delegate ) {
38		-	super( delegate );
39		-
40		-	if ( distance < 0 ) {
41		-	throw new IllegalArgumentException( String.valueOf( distance ) );
42		-	}
43		-
44		-	m_threshold = distance;
45		-	}
46		-
47		-	protected boolean equalsThreshold( int deltaX, int deltaY ) {
48		-	return Math.abs( deltaX ) >= m_threshold \|\| Math.abs( deltaY ) >= m_threshold;
49		-	}
50		-
51		-	@Override
52		-	public void start( MouseEvent e ) {
53		-	if ( m_threshold == 0 ) {
54		-	m_started = true;
55		-	super.start( e );
56		-	} else {
57		-	m_start = e;
58		-	}
59		-	}
60		-
61		-	@Override
62		-	public void step( DragEvent e ) {
63		-	if ( !m_started && equalsThreshold( e.getDeltaX(), e.getDeltaY() ) ) {
64		-	m_started = true;
65		-	super.start( m_start );
66		-	}
67		-	if ( m_started ) {
68		-	super.step( e );
69		-	}
70		-	}
71		-
72		-	@Override
73		-	public void finish() {
74		-	super.finish();
75		-	m_started = false;
76		-	m_start = null;
77		-	}
78		-	}
	1	+	// This Source Code is Copyright & Licenced as indicated below
	2	+	package org.litesoft.GWT.client.widgets.nonpublic.external;
	3	+	/*
	4	+	* Copyright 2007 Mat Gessel <mat.gessel@gmail.com>
	5	+	*
	6	+	* Licensed under the Apache License, Version 2.0 (the "License"); you may not
	7	+	* use this file except in compliance with the License. You may obtain a copy of
	8	+	* the License at
	9	+	*
	10	+	* http://www.apache.org/licenses/LICENSE-2.0
	11	+	*
	12	+	* Unless required by applicable law or agreed to in writing, software
	13	+	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	14	+	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	15	+	* License for the specific language governing permissions and limitations under
	16	+	* the License.
	17	+	*/
	18	+
	19	+	/**
	20	+	* A DragGesture wrapper which prevents the wrapped gesture's step action
	21	+	* from occuring until a specified distance is exceeded. This can be used to
	22	+	* prevent accidental manipulation or to pervent the wrapped gesture's start
	23	+	* action from being executed until the mouse is moved.
	24	+	*/
	25	+	public class DragThresholdFilter extends DragGestureWrapper {
	26	+	private final int m_threshold;
	27	+
	28	+	private MouseEvent m_start;
	29	+	private boolean m_started = false;
	30	+
	31	+	/**
	32	+	* Creates a new DragGesture with the specified threshold.
	33	+	*
	34	+	* @param distance the distance in screen pixels to move before taking an
	35	+	* action, or <code>0</code>
	36	+	*/
	37	+	public DragThresholdFilter( int distance, DragGesture delegate ) {
	38	+	super( delegate );
	39	+
	40	+	if ( distance < 0 ) {
	41	+	throw new IllegalArgumentException( String.valueOf( distance ) );
	42	+	}
	43	+
	44	+	m_threshold = distance;
	45	+	}
	46	+
	47	+	protected boolean equalsThreshold( int deltaX, int deltaY ) {
	48	+	return Math.abs( deltaX ) >= m_threshold \|\| Math.abs( deltaY ) >= m_threshold;
	49	+	}
	50	+
	51	+	@Override
	52	+	public void start( MouseEvent e ) {
	53	+	if ( m_threshold == 0 ) {
	54	+	m_started = true;
	55	+	super.start( e );
	56	+	} else {
	57	+	m_start = e;
	58	+	}
	59	+	}
	60	+
	61	+	@Override
	62	+	public void step( DragEvent e ) {
	63	+	if ( !m_started && equalsThreshold( e.getDeltaX(), e.getDeltaY() ) ) {
	64	+	m_started = true;
	65	+	super.start( m_start );
	66	+	}
	67	+	if ( m_started ) {
	68	+	super.step( e );
	69	+	}
	70	+	}
	71	+
	72	+	@Override
	73	+	public void finish() {
	74	+	super.finish();
	75	+	m_started = false;
	76	+	m_start = null;
	77	+	}
	78	+	}

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