java qr code reader example HANDLING THE EVENTS OF THE INVESTMENT QUOTE APPLICATION IN KJAVA in Java

Generation QR Code in Java HANDLING THE EVENTS OF THE INVESTMENT QUOTE APPLICATION IN KJAVA

HANDLING THE EVENTS OF THE INVESTMENT QUOTE APPLICATION IN KJAVA
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Listing 9.6
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The displayChart method in RetrieveQuoteSpotlet
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private void displayChart(String currentSymbol) { //later on, get prices from a database here int[] prices = {75,55,110,45}; if (prices != null) { if (prices.length > 2) { paintChart(currentSymbol,prices[0],prices[2]); } else { Graphics.drawRectangle(5,60,155,70,Graphics.ERASE,0); Graphics.drawString("Recorded price for " + currentSymbol + " is: $" + prices[0] + "." + prices[1], 5, 65, Graphics.PLAIN); Graphics.drawString("No historical data exists.", 5, 80, Graphics.INVERT); } }
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else { Graphics.playSound(Graphics.SOUND_ERROR); Dialog noDataAlert = new Dialog(this,"Alert", "No price exists for " + currentSymbol,"OK"); noDataAlert.showDialog(); } }
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The same fake prices for all investments for now With both a historical and current price, display the bar graph With only a single current price, display the price and a message With no prices, tell the customer that no prices exist Again, because the application is not yet hooked up to a database or quote service, we provide a set of phony current and historical prices for every symbol of $75.55 and $110.45. This will be changed later so as to get the prices from a database on the device. With the displayChart() method handling most of the details surrounding what and how to display price quotes, the Spotlet s penDown() method must orchestrate calls to the appropriate handling mechanisms as shown in listing 9.7.
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Listing 9.7 The penDown method in RetrieveQuoteSpotlet
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public void penDown(int x, int y) { if (exitButton.pressed(x,y)){ Graphics.playSound(Graphics.SOUND_CONFIRMATION); System.exit(0); } else if (getButton.pressed(x,y)) { symbolField.loseFocus(); if ((symbolField.getText().length() > 0) && (checkSymbol())) { Graphics.playSound(Graphics.SOUND_STARTUP); String sym = symbolField.getText().toUpperCase(); displayChart(sym); }
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KJAVA USER INTERFACE
} else if (symbolField.pressed(x,y)) { symbolField.setFocus(); } else if (stockButton.pressed(x,y)) { symbolField.loseFocus(); stockButton.handlePenDown(x,y); } else if (fundButton.pressed(x,y)) { symbolField.loseFocus(); fundButton.handlePenDown(x,y); } }
In the case of our two applications, we are not concerned with the penUp events. However, if we were, we would simply override the penUp(int x, int y) method and react to the events as necessary. 9.6.3 Handling pen movement We need to handle one final event that our ObtainQuoteSpotlet may see. We have handled the customer s desire to scroll the price quote results scroll text box by either pushing the scroll-up or scroll-down buttons at the bottom of the device through the keyDown() implementation. We have also handled the customer s desire to scroll the same scroll text box by tapping the scroll bar on the component. But what if the user attempts to drag the position indicator of the scroll bar up or down In order to handle this last event, we must implement the penMove() method. Since a scroll text box already knows how to handle this event, we need to check that any movement with the pen occurs within the instance of the ScrollTextBox and if it does, forward the event on to the component s handling method.
public void penMove (int x, int y) { if (resultsBox.contains(x,y)) { resultsBox.handlePenMove(x,y); } }
This method is absent from the RetrieveQuoteSpotlet since the Spotlet has no scroll text box and therefore no need to react to pen movement. Our applications user interfaces have been completed. The full code for our two Spotlets is displayed in listings 9.8 and 9.9 as follows.
Listing 9.8 The complete ObtainQuoteSpotlet.java
import com.sun.kjava.*; public class ObtainQuoteSpotlet extends Spotlet implements DialogOwner { private private private private private TextField symbolField = null; RadioButton stockButton = null; RadioButton fundButton = null; RadioGroup investmentChoice = null; ScrollTextBox resultsBox = null;
HANDLING THE EVENTS OF THE INVESTMENT QUOTE APPLICATION IN KJAVA
private Button exitButton = null; private Button getButton = null; public ObtainQuoteSpotlet() { String tfLabel = "Symbol"; symbolField = new TextField(tfLabel,5,25,Graphics.getWidth(tfLabel) + 40, Graphics.getHeight(tfLabel)); stockButton = new RadioButton(50,45,"Stock"); fundButton = new RadioButton(100,45,"Fund"); investmentChoice = new RadioGroup(2); investmentChoice.add(stockButton); investmentChoice.add(fundButton); investmentChoice.setSelected(stockButton); resultsBox = new ScrollTextBox("",8,65,137,45); exitButton = new Button("Exit",5,140); getButton = new Button("Get Quote", 105,140); } public static void main (String args[]) { ObtainQuoteSpotlet quoteSpotlet = new ObtainQuoteSpotlet(); quoteSpotlet.displayForm(); } private void displayForm() { register(NO_EVENT_OPTIONS); Graphics.clearScreen(); Graphics.drawString("Obtain Investment Quote",5,10,Graphics.INVERT); Graphics.drawString("Type:",5,45, Graphics.PLAIN); symbolField.paint(); stockButton.paint(); fundButton.paint(); resultsBox.paint(); Graphics.drawBorder(5,60, 150, 55, Graphics.PLAIN, Graphics.SIMPLE); exitButton.paint(); getButton.paint(); } private boolean checkSymbol() { if ((investmentChoice.getSelected().equals(fundButton)) && !(symbolField.getText().toUpperCase().endsWith("X"))){ Graphics.playSound(Graphics.SOUND_ERROR); Dialog symbolAlert = new Dialog(this,"Alert", "Check Symbol\n\nMutual Funds end in 'X'","OK"); symbolAlert.showDialog(); return false; } return true; } public void penDown(int x, int y) { if (exitButton.pressed(x,y)){ Graphics.playSound(Graphics.SOUND_CONFIRMATION); System.exit(0); } else if (getButton.pressed(x,y)) { symbolField.loseFocus();
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