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ca.spaz.cron.ui.MeasureWidget	0%	0%

1		/*
2		* Created on Apr 9, 2005 by davidson
3		*/
4		package ca.spaz.cron.ui;
5
6		import java.awt.BorderLayout;
7		import java.awt.event.*;
8		import java.util.*;
9
10		import javax.swing.*;
11		import javax.swing.event.*;
12
13		import ca.spaz.cron.database.*;
14		import ca.spaz.gui.DoubleField;
15
16		/**
17		* A measure widget displays the UI for choosing an amount of a food item, based
18		* on various Measures stored for the particular food being weighed.
19		*
20		* @author davidson
21		*/
22		public class MeasureWidget extends JPanel implements ItemListener, ActionListener, KeyListener {
23		// initial weight by default
24	0	private Measure curMeasure = Measure.GRAM;
25
26		// list of weights for selected food
27	0	private JComboBox measures = new JComboBox();
28
29		// multiplier (amount) of currently showing weight
30	0	private DoubleField multiplier = new DoubleField(0,8);
31
32		// change listeners
33	0	private Vector listeners = new Vector();
34
35		// determiens if multiplier value is linked to the weight
36	0	private boolean linked = false;
37
38		/**
39		* Construct a new measure widget
40		*/
41	0	public MeasureWidget() {
42	0	multiplier.setRange(0,1000000);
43	0	multiplier.setValue(1);
44
45	0	measures.addItemListener(this);
46	0	multiplier.addActionListener(this);
47	0	multiplier.addKeyListener(this);
48
49	0	setLayout(new BorderLayout(4,4));
50	0	add(multiplier, BorderLayout.WEST);
51	0	add(measures, BorderLayout.CENTER);
52	0	}
53
54		/**
55		* Set the measure to display weights for a particular food.
56		*/
57		public void setFood(Food f) {
58	0	measures.setModel(new DefaultComboBoxModel(f.getMeasures().toArray()));
59	0	curMeasure = Measure.GRAM;
60	0	fireChangeEvent();
61	0	}
62
63		/**
64		* Set the weight to display
65		* @param w the type of measure
66		* @param mult the multiplier for that measure
67		*/
68		public void setMeasure(Measure w, double mult) {
69	0	measures.setSelectedItem(w);
70	0	multiplier.setValue(mult);
71	0	fireChangeEvent();
72	0	}
73
74		/**
75		* Update the widget after a weight change has occurred.
76		* Called when weight menu is changed or edited
77		*/
78		public void updateMeasure() {
79	0	Measure w = getSelectedMeasure();
80	0	if (w != curMeasure) {
81		// if linked, the weight translates the multiplier from the last
82		// selected weight, such that the actual amount of food stays constant.
83	0	if (linked) {
84	0	double mult = w.getAmount();
85	0	if (curMeasure != null) {
86	0	double grams = curMeasure.getGrams() * multiplier.getValue();
87	0	mult = grams/w.getGrams();
88		}
89	0	multiplier.setValue(mult);
90		}
91	0	focus();
92	0	curMeasure = w;
93		}
94	0	fireChangeEvent();
95	0	}
96
97		/**
98		* Get the multiplier for the current weight and mult settings.
99		* @return a multiple of the standard nutrient value (x per 100g)
100		*/
101		public double getMultiplier() {
102	0	return getGrams() / 100.0;
103		}
104
105		/**
106		* Get the number of grams in this measure
107		* @return the number of grams in this state
108		*/
109		public double getGrams() {
110	0	Measure w = getSelectedMeasure();
111	0	if (w != null) {
112	0	return multiplier.getValue() * w.getGrams();// * (1.0/w.getAmount());
113		}
114	0	return 0;
115		}
116
117		public Measure getSelectedMeasure() {
118	0	return (Measure)measures.getSelectedItem();
119		}
120
121		/**
122		* Focus the component, selecting the text field and giving it
123		* keyboard focus.
124		*/
125		public void focus() {
126	0	multiplier.requestFocus();
127	0	multiplier.selectAll();
128	0	}
129
130		public void addChangeListener(ChangeListener l) {
131	0	listeners.add(l);
132	0	}
133
134		public void addRemoveListener(ChangeListener l) {
135	0	listeners.remove(l);
136	0	}
137
138		public void fireChangeEvent() {
139	0	ChangeEvent ce = new ChangeEvent(this);
140	0	Iterator iter = listeners.iterator();
141	0	while (iter.hasNext()) {
142	0	((ChangeListener)iter.next()).stateChanged(ce);
143	0	}
144	0	}
145
146		/**
147		* Called if the weight menu state is changed
148		*/
149		public void itemStateChanged(ItemEvent e) {
150	0	updateMeasure();
151	0	}
152
153		/**
154		* Called when the text field is set
155		*/
156		public void actionPerformed(ActionEvent arg0) {
157	0	fireChangeEvent();
158	0	}
159
160		public void keyTyped(KeyEvent arg0) {
161	0	}
162
163		public void keyPressed(KeyEvent arg0) {
164	0	}
165
166		/**
167		* Called when the text field is edited
168		*/
169		public void keyReleased(KeyEvent arg0) {
170	0	fireChangeEvent();
171	0	}
172
173		/**
174		* If linked, changing a weight will update the multiplier
175		* to keep the grams constant. Otherwise, the multiplier is left unchanged.
176		*
177		* @return true if the multiplier is linked to the weight
178		*/
179		public boolean isLinked() {
180	0	return linked;
181		}
182
183
184		/**
185		* If linked, changing a weight will update the multiplier
186		* to keep the grams constant. Otherwise, the multiplier
187		* is left unchanged.
188		*/
189		public void setLinked(boolean linked) {
190	0	this.linked = linked;
191	0	}
192		}

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