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comparison dwtx/draw2d/DefaultRangeModel.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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96:b492ba44e44d 98:95307ad235d9
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.draw2d.DefaultRangeModel;
14
15 import dwt.dwthelper.utils;
16 import dwtx.dwtxhelper.Bean;
17 import tango.text.convert.Format;
18
19 import dwtx.draw2d.RangeModel;
20
21 /**
22 * Generic implementation for a RangeModel.
23 *
24 *
25 *<pre>
26 * |<----extent--->|
27 * ----|-----------|---------------|---------------|----
28 * min | max
29 * value
30 * </pre>
31 */
32 public class DefaultRangeModel
33 : RangeModel
34 {
35
36 /**
37 * Listeners interested in the range model's property changes.
38 */
39 protected PropertyChangeSupport propertyListeners;
40 private int minimum = 0;
41 private int maximum = 100;
42 private int extent = 20;
43 private int value = 0;
44
45 public this(){
46 propertyListeners = new PropertyChangeSupport(this);
47 }
48
49 /**
50 * Registers the given listener as a PropertyChangeListener.
51 *
52 * @param listener the listener to be added
53 * @since 2.0
54 */
55 public void addPropertyChangeListener(PropertyChangeListener listener) {
56 propertyListeners.addPropertyChangeListener(listener);
57 }
58
59 /**
60 * Notifies any listening PropertyChangeListeners that the property with the given id has
61 * changed.
62 *
63 * @param string the property name
64 * @param oldValue the old value
65 * @param newValue the new value
66 * @since 2.0
67 */
68 protected void firePropertyChange(String string, int oldValue, int newValue) {
69 propertyListeners.firePropertyChange(string, oldValue, newValue);
70 }
71
72 /**
73 * @return the extent
74 */
75 public int getExtent() {
76 return extent;
77 }
78
79 /**
80 * @return the maximum value
81 */
82 public int getMaximum() {
83 return maximum;
84 }
85
86 /**
87 * @return the minimum value
88 */
89 public int getMinimum() {
90 return minimum;
91 }
92
93 /**
94 * @return the current value
95 */
96 public int getValue() {
97 return value;
98 }
99
100 /**
101 * @return whether the extent is between the minimum and maximum values
102 */
103 public bool isEnabled() {
104 return (getMaximum() - getMinimum()) > getExtent();
105 }
106
107 /**
108 * Removes the given PropertyChangeListener from the list of listeners.
109 *
110 * @param listener the listener to be removed
111 */
112 public void removePropertyChangeListener(PropertyChangeListener listener) {
113 propertyListeners.removePropertyChangeListener(listener);
114 }
115
116 /**
117 * @see dwtx.draw2d.RangeModel#setAll(int, int, int)
118 */
119 public void setAll(int min, int ext, int max) {
120 int oldMin = minimum;
121 int oldExtent = extent;
122 int oldMax = maximum;
123 maximum = max;
124 minimum = min;
125 extent = ext;
126 if (oldMax !is max)
127 firePropertyChange(PROPERTY_MAXIMUM, oldMax, max);
128 if (oldExtent !is ext)
129 firePropertyChange(PROPERTY_EXTENT, oldExtent, ext);
130 if (oldMin !is min)
131 firePropertyChange(PROPERTY_MINIMUM, oldMin, min);
132 setValue(getValue());
133 }
134
135 /**
136 * Sets this RangeModel's extent and fires a property change if the given value is
137 * different from the current extent.
138 *
139 * @param extent the new extent value
140 */
141 public void setExtent(int extent) {
142 if (this.extent is extent)
143 return;
144 int oldValue = this.extent;
145 this.extent = extent;
146 firePropertyChange(PROPERTY_EXTENT, oldValue, extent);
147 setValue(getValue());
148 }
149
150 /**
151 * Sets this RangeModel's maximum value and fires a property change if the given value is
152 * different from the current maximum value.
153 *
154 * @param maximum the new maximum value
155 */
156 public void setMaximum(int maximum) {
157 if (this.maximum is maximum)
158 return;
159 int oldValue = this.maximum;
160 this.maximum = maximum;
161 firePropertyChange(PROPERTY_MAXIMUM, oldValue, maximum);
162 setValue(getValue());
163 }
164
165 /**
166 * Sets this RangeModel's minimum value and fires a property change if the given value is
167 * different from the current minimum value.
168 *
169 * @param minimum the new minumum value
170 */
171 public void setMinimum(int minimum) {
172 if (this.minimum is minimum)
173 return;
174 int oldValue = this.minimum;
175 this.minimum = minimum;
176 firePropertyChange(PROPERTY_MINIMUM, oldValue, minimum);
177 setValue(getValue());
178 }
179
180 /**
181 * Sets this RangeModel's current value. If the given value is greater than the maximum,
182 * the maximum value is used. If the given value is less than the minimum, the minimum
183 * value is used. If the adjusted value is different from the current value, a property
184 * change is fired.
185 *
186 * @param value the new value
187 */
188 public void setValue(int value) {
189 value = Math.max(getMinimum(), Math.min(getMaximum() - getExtent(), value));
190 if (this.value is value)
191 return;
192 int oldValue = this.value;
193 this.value = value;
194 firePropertyChange(PROPERTY_VALUE, oldValue, value);
195 }
196
197 /**
198 * @see java.lang.Object#toString()
199 */
200 public String toString() {
201 return Format( "{} ({}, {}, {}, {})", super.toString(), minimum, maximum //$NON-NLS-2$ //$NON-NLS-1$
202 , extent, value ); //$NON-NLS-3$ //$NON-NLS-2$ //$NON-NLS-1$
203 }
204
205 }