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实例说明锚点位置的定义

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

import Javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class Text extends MIDlet

{

private Display display; // The display

private TextCanvas canvas; // Canvas to display text

private AnchorPtList anchorPt; // List to query for anchor point

private int anchorPoint = Graphics.BASELINE Graphics.HCENTER;

public Text()

{

display = Display.getDisplay(this);

canvas = new TextCanvas(this);

anchorPt = new AnchorPtList("Anchor point", List.IMPLICIT, this);

}

protected void startApp()

{

showCanvas();

}

protected void pauseApp()

{ }

protected void destroyApp( boolean unconditional )

{ }

public void showCanvas()

{

display.setCurrent(canvas);

}

public void showList()

{

display.setCurrent(anchorPt);

}

public int getAnchorPoint()

{

return anchorPoint;

}

public void setAnchorPoint(int anchorPoint)

{

this.anchorPoint = anchorPoint;

}

public void exitMIDlet()

{

destroyApp(true);

notifyDestroyed();

}

}

/*--------------------------------------------------

* Class TextCanvas

*

* Draw text at specified anchor point

*-------------------------------------------------*/

class TextCanvas extends Canvas implements CommandListener

{

private Command cmExit; // Exit midlet

private Command cmGetAnchorPt;

private Text midlet;

public TextCanvas(Text midlet)

{

this.midlet = midlet;

// Create commands & listen for events

cmExit = new Command("Exit", Command.EXIT, 1);

cmGetAnchorPt = new Command("Anchor", Command.SCREEN, 2);

addCommand(cmExit);

addCommand(cmGetAnchorPt);

setCommandListener(this);

}

/*--------------------------------------------------

* Draw text

*-------------------------------------------------*/

protected void paint(Graphics g)

{

int xcenter = getWidth() / 2,

ycenter = getHeight() / 2;

// Due to a bug in MIDP 1.0.3 we need to

// force a clear of the display

g.setColor(255, 255, 255); // White pen

g.fillRect(0, 0, getWidth(), getHeight());

g.setColor(0, 0, 0); // Black pen

// Choose a font

g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM));

// Draw a dot at the center of the display

g.drawLine(xcenter, ycenter, xcenter, ycenter);

// x and y are always at the center of the display

// Move the text around x and y based on the anchor point

g.drawString("go j2me!", xcenter, ycenter, midlet.getAnchorPoint());

}

/*--------------------------------------------------

* Exit midlet or show anchor point selection list

*-------------------------------------------------*/

public void commandAction(Command c, Displayable d)

{

if (c == cmExit)

midlet.exitMIDlet();

else if (c == cmGetAnchorPt)

{

midlet.showList();

}

}

}

/*--------------------------------------------------

* Class AnchorPtList

*

* List to query for an anchor point

*-------------------------------------------------*/

class AnchorPtList extends List implements CommandListener

{

private Text midlet;

public AnchorPtList(String title, int listType, Text midlet)

{

// Call list constrUCtor

super(title, listType);

this.midlet = midlet;

append("Top/Left", null);

append("Top/HCenter", null);

append("Top/Right", null);

append("Baseline/Left", null);

append("Baseline/HCenter", null);

append("Baseline/Right", null);

append("Bottom/Left", null);

append("Bottom/HCenter", null);

append("Bottom/Right", null);

setCommandListener(this);

}

/*--------------------------------------------------

* Commands to set anchor point

*-------------------------------------------------*/

public void commandAction(Command c, Displayable s)

{

switch (getSelectedIndex())

{

case 0:

midlet.setAnchorPoint(Graphics.TOP Graphics.LEFT);

break;

case 1:

midlet.setAnchorPoint(Graphics.TOP Graphics.HCENTER);

break;

case 2:

midlet.setAnchorPoint(Graphics.TOP Graphics.RIGHT);

break;

case 3:

midlet.setAnchorPoint(Graphics.BASELINE Graphics.LEFT);

break;

case 4:

midlet.setAnchorPoint(Graphics.BASELINE Graphics.HCENTER);

break;

case 5:

midlet.setAnchorPoint(Graphics.BASELINE Graphics.RIGHT);

break;

case 6:

midlet.setAnchorPoint(Graphics.BOTTOM Graphics.LEFT);

break;

case 7:

midlet.setAnchorPoint(Graphics.BOTTOM Graphics.HCENTER);

break;

case 8:

midlet.setAnchorPoint(Graphics.BOTTOM Graphics.RIGHT);

break;

default:

midlet.setAnchorPoint(Graphics.BASELINE Graphics.HCENTER);

}

midlet.showCanvas();

}

}

(出处:http://www.knowsky.com)

 
 
 
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