source: trunk/examples/script/calculator/calculator.js@ 641

Last change on this file since 641 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.
File size: 8.4 KB
Line 
1Function.prototype.bind = function() {
2 var func = this;
3 var thisObject = arguments[0];
4 var args = Array.prototype.slice.call(arguments, 1);
5 return function() {
6 return func.apply(thisObject, args);
7 }
8}
9
10//! [0]
11function Calculator(ui)
12{
13 this.ui = ui;
14
15 this.pendingAdditiveOperator = Calculator.NO_OPERATOR;
16 this.pendingMultiplicativeOperator = Calculator.NO_OPERATOR;
17 this.sumInMemory = 0;
18 this.sumSoFar = 0;
19 this.factorSoFar = 0;
20 this.waitingForOperand = true;
21
22 with (ui) {
23 display.text = "0";
24
25 zeroButton.clicked.connect(this.digitClicked.bind(this, 0));
26 oneButton.clicked.connect(this.digitClicked.bind(this, 1));
27 twoButton.clicked.connect(this.digitClicked.bind(this, 2));
28 threeButton.clicked.connect(this.digitClicked.bind(this, 3));
29 fourButton.clicked.connect(this.digitClicked.bind(this, 4));
30 fiveButton.clicked.connect(this.digitClicked.bind(this, 5));
31 sixButton.clicked.connect(this.digitClicked.bind(this, 6));
32 sevenButton.clicked.connect(this.digitClicked.bind(this, 7));
33 eightButton.clicked.connect(this.digitClicked.bind(this, 8));
34 nineButton.clicked.connect(this.digitClicked.bind(this, 9));
35
36 pointButton.clicked.connect(this, "pointClicked");
37 changeSignButton.clicked.connect(this, "changeSignClicked");
38
39 backspaceButton.clicked.connect(this, "backspaceClicked");
40 clearButton.clicked.connect(this, "clear");
41 clearAllButton.clicked.connect(this, "clearAll");
42
43 clearMemoryButton.clicked.connect(this, "clearMemory");
44 readMemoryButton.clicked.connect(this, "readMemory");
45 setMemoryButton.clicked.connect(this, "setMemory");
46 addToMemoryButton.clicked.connect(this, "addToMemory");
47
48 divisionButton.clicked.connect(this.multiplicativeOperatorClicked.bind(this, Calculator.DIVISION_OPERATOR));
49 timesButton.clicked.connect(this.multiplicativeOperatorClicked.bind(this, Calculator.TIMES_OPERATOR));
50 minusButton.clicked.connect(this.additiveOperatorClicked.bind(this, Calculator.MINUS_OPERATOR));
51 plusButton.clicked.connect(this.additiveOperatorClicked.bind(this, Calculator.PLUS_OPERATOR));
52
53 squareRootButton.clicked.connect(this.unaryOperatorClicked.bind(this, Calculator.SQUARE_OPERATOR));
54 powerButton.clicked.connect(this.unaryOperatorClicked.bind(this, Calculator.POWER_OPERATOR));
55 reciprocalButton.clicked.connect(this.unaryOperatorClicked.bind(this, Calculator.RECIPROCAL_OPERATOR));
56 equalButton.clicked.connect(this, "equalClicked");
57 }
58}
59//! [0]
60
61Calculator.NO_OPERATOR = 0;
62Calculator.SQUARE_OPERATOR = 1;
63Calculator.POWER_OPERATOR = 2;
64Calculator.RECIPROCAL_OPERATOR = 3;
65Calculator.DIVISION_OPERATOR = 4;
66Calculator.TIMES_OPERATOR = 5;
67Calculator.MINUS_OPERATOR = 6;
68Calculator.PLUS_OPERATOR = 7;
69
70Calculator.prototype.abortOperation = function()
71{
72 this.clearAll();
73 this.ui.display.text = "####";
74}
75
76Calculator.prototype.calculate = function(rightOperand, pendingOperator)
77{
78 if (pendingOperator == Calculator.PLUS_OPERATOR) {
79 this.sumSoFar += rightOperand;
80 } else if (pendingOperator == Calculator.MINUS_OPERATOR) {
81 this.sumSoFar -= rightOperand;
82 } else if (pendingOperator == Calculator.TIMES_OPERATOR) {
83 this.factorSoFar *= rightOperand;
84 } else if (pendingOperator == Calculator.DIVISION_OPERATOR) {
85 if (rightOperand == 0)
86 return false;
87 this.factorSoFar /= rightOperand;
88 }
89 return true;
90}
91
92//! [1]
93Calculator.prototype.digitClicked = function(digitValue)
94{
95 if ((digitValue == 0) && (this.ui.display.text == "0"))
96 return;
97 if (this.waitingForOperand) {
98 this.ui.display.clear();
99 this.waitingForOperand = false;
100 }
101 this.ui.display.text += digitValue;
102}
103//! [1]
104
105Calculator.prototype.unaryOperatorClicked = function(op)
106{
107 var operand = this.ui.display.text - 0;
108 var result = 0;
109 if (op == Calculator.SQUARE_OPERATOR) {
110 if (operand < 0) {
111 this.abortOperation();
112 return;
113 }
114 result = Math.sqrt(operand);
115 } else if (op == Calculator.POWER_OPERATOR) {
116 result = Math.pow(operand, 2);
117 } else if (op == Calculator.RECIPROCAL_OPERATOR) {
118 if (operand == 0.0) {
119 this.abortOperation();
120 return;
121 }
122 result = 1 / operand;
123 }
124 this.ui.display.text = result + "";
125 this.waitingForOperand = true;
126}
127
128Calculator.prototype.additiveOperatorClicked = function(op)
129{
130 var operand = this.ui.display.text - 0;
131
132 if (this.pendingMultiplicativeOperator != Calculator.NO_OPERATOR) {
133 if (!this.calculate(operand, this.pendingMultiplicativeOperator)) {
134 this.abortOperation();
135 return;
136 }
137 this.ui.display.text = this.factorSoFar + "";
138 operand = this.factorSoFar;
139 this.factorSoFar = 0;
140 this.pendingMultiplicativeOperator = Calculator.NO_OPERATOR;
141 }
142
143 if (this.pendingAdditiveOperator != Calculator.NO_OPERATOR) {
144 if (!this.calculate(operand, this.pendingAdditiveOperator)) {
145 this.abortOperation();
146 return;
147 }
148 this.ui.display.text = this.sumSoFar + "";
149 } else {
150 this.sumSoFar = operand;
151 }
152
153 this.pendingAdditiveOperator = op;
154 this.waitingForOperand = true;
155}
156
157Calculator.prototype.multiplicativeOperatorClicked = function(op)
158{
159 var operand = this.ui.display.text - 0;
160
161 if (this.pendingMultiplicativeOperator != Calculator.NO_OPERATOR) {
162 if (!this.calculate(operand, this.pendingMultiplicativeOperator)) {
163 this.abortOperation();
164 return;
165 }
166 this.ui.display.text = this.factorSoFar + "";
167 } else {
168 this.factorSoFar = operand;
169 }
170
171 this.pendingMultiplicativeOperator = op;
172 this.waitingForOperand = true;
173}
174
175Calculator.prototype.equalClicked = function()
176{
177 var operand = this.ui.display.text - 0;
178
179 if (this.pendingMultiplicativeOperator != Calculator.NO_OPERATOR) {
180 if (!this.calculate(operand, this.pendingMultiplicativeOperator)) {
181 this.abortOperation();
182 return;
183 }
184 operand = this.factorSoFar;
185 this.factorSoFar = 0.0;
186 this.pendingMultiplicativeOperator = Calculator.NO_OPERATOR;
187 }
188 if (this.pendingAdditiveOperator != Calculator.NO_OPERATOR) {
189 if (!this.calculate(operand, this.pendingAdditiveOperator)) {
190 this.abortOperation();
191 return;
192 }
193 this.pendingAdditiveOperator = Calculator.NO_OPERATOR;
194 } else {
195 this.sumSoFar = operand;
196 }
197
198 this.ui.display.text = this.sumSoFar + "";
199 this.sumSoFar = 0.0;
200 this.waitingForOperand = true;
201}
202
203Calculator.prototype.pointClicked = function()
204{
205 if (this.waitingForOperand)
206 this.ui.display.text = "0";
207 if (this.ui.display.text.indexOf(".") == -1)
208 this.ui.display.text += ".";
209 this.waitingForOperand = false;
210}
211
212//! [2]
213Calculator.prototype.changeSignClicked = function()
214{
215 var text = this.ui.display.text;
216 var value = text - 0;
217
218 if (value > 0) {
219 text = "-" + text;
220 } else if (value < 0) {
221 text = text.slice(1);
222 }
223 this.ui.display.text = text;
224}
225//! [2]
226
227Calculator.prototype.backspaceClicked = function()
228{
229 if (this.waitingForOperand)
230 return;
231
232 var text = this.ui.display.text;
233 text = text.slice(0, -1);
234 if (text.length == 0) {
235 text = "0";
236 this.waitingForOperand = true;
237 }
238 this.ui.display.text = text;
239}
240
241Calculator.prototype.clear = function()
242{
243 if (this.waitingForOperand)
244 return;
245
246 this.ui.display.text = "0";
247 this.waitingForOperand = true;
248}
249
250Calculator.prototype.clearAll = function()
251{
252 this.sumSoFar = 0.0;
253 this.factorSoFar = 0.0;
254 this.pendingAdditiveOperator = Calculator.NO_OPERATOR;
255 this.pendingMultiplicativeOperator = Calculator.NO_OPERATOR;
256 this.ui.display.text = "0";
257 this.waitingForOperand = true;
258}
259
260Calculator.prototype.clearMemory = function()
261{
262 this.sumInMemory = 0.0;
263}
264
265Calculator.prototype.readMemory = function()
266{
267 this.ui.display.text = this.sumInMemory + "";
268 this.waitingForOperand = true;
269}
270
271Calculator.prototype.setMemory = function()
272{
273 this.equalClicked();
274 this.sumInMemory = this.ui.display.text - 0;
275}
276
277Calculator.prototype.addToMemory = function()
278{
279 this.equalClicked();
280 this.sumInMemory += this.ui.display.text - 0;
281}
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