Help on custom caret painting

Question

Hello all!
I am developing a very custom editor (not only characters, but also drawings, etc) --
therefore need a caret blinking somewhere text exists.
Tried out the following code:
* Paints only caret.
* @param pGraphics
* @param pLineHeight
private void paintCaret(Graphics pGraphics, int pLineHeight) {
     final int x = getCaretX();
     final int y = getCaretY();
     if (x < 0 || y < 0) return;
     pGraphics.setXORMode(Color.BLACK);
     pGraphics.setColor(Color.WHITE);
     pGraphics.fillRect(x, y, CARET_WIDTH, pLineHeight);
//     caretOn =! caretOn;
     }Cursor blinking is done this way:
     caretBlinkTimer.schedule(new SwingTimerTask() {
          protected void doRun() {
               final int x = getCaretX();
               final int y = getCaretY();
               if (x < 0 || y < 0) return;
               repaint(x, y, CARET_WIDTH, lineHeight);
     }, 0/*start_jetzt!*/, CARET_BLINK_RATE);The paintComponent(Graphics) code knows if to paint caret only, or more -- to save machine resources, deducing it from area of "dirty" clip rectangle to be repainted.
Well, what's the problem?
The problem exists. The editor backgound is somehow yellow color. When application starts and editor is shown up, I can observe the default gray color instead yellow in place of hidden-by-blinking timer caret. In the same situation, if I select another component (out of this editor), which currently paints itself using a kind of turqoise, the caret turns itself in turqoise, and hidden caret even worse, in a kind of violet (I suppose is inverse of turqoise).
I tried a lot of "dances with flute" around problem, but it doesn't help at all... You see, Graphics has color settings only by setColor(Color) and setXORMode(Color). And, what more (I know 4 sure) the pGraphics object is a brand new one, each another time the "paintComponent(Graphics)" is invoked...
So, please, any ideas are accepted. Helping me, you help a lot of people with similar problems.
Thank you in advance.

Answer 1

What an ungodly amount of the code for the task!
I tried
SELECT * FROM SCCM_GetNextServiceWindow('00811A9E08221600', 4)
Which is said mean "Occurs the Third Monday of every 1 month(s)" and it returned 2015-03-17. Which is a Tuesday. But it is the third Tuesday.
Turns out that I have British settings on that instance, DATEFIRST is 1. If do SET DATEFIRST 7, I get 2015-03-23. Which is a Monday, but the wrong one.
The current setting of DATEFIRST can be detected with @@DATEFIRST, and that would make the code even more complex.
My gut reaction would be to start over and do it all in C#, where at least I don't have to bother about SET DATEFIRST.
Or maybe first inspect that the ScheduleToken is correct. Maybe it is, but to me that is just an incomprehensible hex string.
Erland Sommarskog, SQL Server MVP, [email protected]