Attachment 4376 Details for Bug 35790 – Test program.

Test program.

(text/plain), 2.44 KB, created by adrian

on 2003-03-27 19:07:10 EST

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Creator: adrian

Created: 2003-03-27 19:07:10 EST

Size: 2.44 KB

patch

obsolete

>// Mismatch between actual painting with gc.drawString() and the gc.stringExtent()
>// info, for e.g., chars '\u0001' - \u0006'.  The extent returned is larger than the
>// actual extent painted.
>//
>// This makes it impossible e.g., to match a mouse-click's x offset in the window
>// to the correct index inside the displayed text string.
>//
>// These characters seem to be filtered out somehow by StyledText's rendering
>// (they have a width of 0 pixels on the display)?!  What is the full set of these
>// characters?
>
>import org.eclipse.swt.*;
>import org.eclipse.swt.graphics.*;
>import org.eclipse.swt.widgets.*;
>
>public class Main {
>
>public static void main (String[] args) {
>   Display display = new Display();
>   Shell shell = new Shell(display);
>   shell.open();
>   GC gc = new GC(shell);
>
>   Font font = new Font(display, "Courier", 10, SWT.NORMAL);
>   gc.setFont(font);
>
>   String r  = "*23456789012345678901234567890....+....01234567890";
>   String x1 = "0....+....01234567890";
>   String x2 = "....01234567890";
>   String x3 = "890";
>
>   int extr = gc.stringExtent(r).x;
>   int ext1 = gc.stringExtent(x1).x;
>   int ext2 = gc.stringExtent(x2).x;
>   int ext3 = gc.stringExtent(x3).x;
>
>   gc.drawString(r, 0, 0);
>   for (int i = 0; i < 50; i++) {
>      int x = gc.stringExtent(r.substring(0,i)).x;
>      gc.drawLine(x, 15, x, 25);
>      gc.drawString(String.valueOf(r.charAt(i)), x, 30);
>      }
>
>   gc.drawString(x1, 0, 60);
>   for (int i = 0; i < 50; i++) {
>      int x = gc.stringExtent(x1.substring(0,i)).x;
>      gc.drawLine(x, 75, x, 85);
>      gc.drawString(String.valueOf(x1.charAt(i)), x, 90);
>      }
>
>   gc.drawString(x2, 0, 120);
>   for (int i = 0; i < 50; i++) {
>      int x = gc.stringExtent(x2.substring(0,i)).x;
>      gc.drawLine(x, 135, x, 145);
>      gc.drawString(String.valueOf(x2.charAt(i)), x, 150);
>      }
>
>   gc.drawString(x3, 0, 180);
>   for (int i = 0; i < 50; i++) {
>      int x = gc.stringExtent(x3.substring(0,i)).x;
>      gc.drawLine(x, 195, x, 205);
>      gc.drawString(String.valueOf(x3.charAt(i)), x, 210);
>      }
>
>   gc.drawString("*** stringExtent()s: " + extr + ' ' + ext1 + ' ' + ext2 + ' ' + ext3,
>                 0, 240);
>
>   gc.dispose ();
>   while (!shell.isDisposed ()) {
>      if (!display.readAndDispatch ()) display.sleep ();
>   }
>   display.dispose ();
>}
>}
>

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