framedtext.java

来自「书籍"Java_面向事件编程"的附带光盘代码」· Java 代码 · 共 44 行

import objectdraw.*;
import java.awt.*;

// A FramedText object displays a specified text message on a
// background framed by a distinct border.
public class FramedText extends FramedDisplay {

    private Text message;            // The message displayed

    // Create a FramedText object displaying the text 'contents'
    // at the position and with the dimensions specified.
    public FramedText( String contents, double x, double y,
                       double width, double height,
                       DrawingCanvas canvas) {
                       
            // construct the frame
        super( x, y, width, height, canvas);

            // Construct and appropriately position the message
        message = new Text ( contents, 
                             displayLeft(), displayTop(), 
                             canvas);
        message.move( (displayWidth()-message.getWidth())/2, 
                      (displayHeight()-message.getHeight())/2 );
        message.setColor( Color.white );
    }

        // Position the message to center it in the frame
    protected void positionContents(  ) {
    
        message.moveTo( displayLeft(), displayTop() );
        message.move( (displayWidth()-message.getWidth())/2, 
                      (displayHeight()-message.getHeight())/2 );
    }        

        // Change the font size used
    public void setTextSize( int size) {
    
        message.setFontSize( size );
        positionContents();
   }

}