Home » Eclipse Projects » Standard Widget Toolkit (SWT) » KTABLE Too Slow - Any Alternative?
| KTABLE Too Slow - Any Alternative? [message #465394] |
Mon, 12 December 2005 11:23  |
Eclipse User |
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Hi, we needed to add the ability to freeze the first column in our SWT
app. Sadly SWT doesnt appear to support this so i used KTable. I like
KTable - its more like SWING model. But, its slow and clunky, especially
if you use rendering to colour the columns. Is there any alternative to
KTable or any way of making SWT achieve this - i find SWT's table's very
poor in comparison to Swing.
thanks,
steve.
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| Re: KTABLE Too Slow - Any Alternative? [message #465413 is a reply to message #465396] |
Mon, 12 December 2005 17:11  |
| Eclipse User |
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Originally posted by: friederich.kupzog.de
Hi Steve,
you should put the m_textRenderer.setBackground() call into
doGetCellRenderer(int, int). But I cannot imagine that
this causes the problem. Anyway try it...
What is this AppConstants.getInstance().gray1 stuff? Maybe try to set up
your colors in a couple of local Color variables. Is the table quicker
without color changes?
If not, from where do you get the actual content?
Regards,
Friederich
steve lane wrote:
>
> Thanks Friederich,
>
> Perhaps i am using it wrong ! I have a table that is quite wide and to
> make the table more readable, rows are grouped in 3's by changing the
> background colour of the columns from a lighter gray to a darker gray.
> When the table is scrolled with the scrollbar, it is visibly very slow
> at re-drawing (i am only displaying 10 rows at a time). Im running on
> XP with jdk1.4.2.
>
> What i am doing code wise is this:
>
> class KTableTextModel extends KTableDefaultModel {
> private final TextCellRenderer m_textRenderer = new
> TextCellRenderer(TextCellRenderer.INDICATION_FOCUS_ROW);
> .
> .
> public Object doGetContentAt(int col, int row) {
> if (col > 2) {
> if ((((col-3) / 3) % 2) == 0) {
> m_textRenderer.setBackground(AppConstants.getInstance().gray 1);
> }
> else {
> m_textRenderer.setBackground(AppConstants.getInstance().gray 2);
> }
> }
> .....
> .....
> }
> .
> .
>
> thanks,
>
> steve.
>
--
Friederich Kupzog
Elektronik & Software
Neusser Str. 5-7
50670 Köln
Tel +49 241 9979356
Fax +49 221 726670
www.kupzog.de/fkmk
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| Re: KTABLE Too Slow - Any Alternative? [message #465432 is a reply to message #465430] |
Tue, 13 December 2005 05:44 |
| Eclipse User |
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Originally posted by: friederich.kupzog.de
steve lane wrote:
> On a slightly seperate ktable issue though, i understand it looks
> different to SWT as its not native widgets, but is it possible to make
> the header row look a little nicer ? The header row just comes up as a
> flat grey look - is there some way you can make it look slightly
> bevelled as with the SWT ones??
Hi Steve,
the following code draws WinXP-like table headers. You can implement
your own KTableCellRenderer and use this code. The code is taken from a
propriety renderer from a 1.x KTable implementation, therefore I am
unfortunately not able to send you the complete renderer class.
public static void drawHeader(GC gc, Rectangle rect, String text)
{
gc.setBackground(ResourceManager.getColor(SWT.COLOR_WIDGET_B ACKGROUND));
gc.fillRectangle(rect);
gc.setForeground(ResourceManager.getColor(SWT.COLOR_WIDGET_H IGHLIGHT_SHADOW));
// obere Linie
gc.drawLine(rect.x, rect.y, rect.x+rect.width-1, rect.y);
// Hellerer Trenner
gc.drawLine(rect.x+rect.width-2, rect.y+2, rect.x+rect.width-2,
rect.y+rect.height-4);
gc.setForeground(ResourceManager.getColor(192,192,192));
// leichtere Schattenlinien oben
gc.drawLine(rect.x, rect.y+rect.height-2, rect.x+rect.width-1,
rect.y+rect.height-2);
// dunklerer Trenner
gc.drawLine(rect.x+rect.width-3, rect.y+2, rect.x+rect.width-3,
rect.y+rect.height-4);
gc.setForeground(ResourceManager.getColor(SWT.COLOR_WIDGET_N ORMAL_SHADOW));
// Leichte Schattenlinie unten
gc.drawLine(rect.x, rect.y+rect.height-1, rect.x+rect.width-1,
rect.y+rect.height-1);
if (text == null) text = "";
Point textSize = getCachedStringExtent(gc, text);
boolean addPoint = false;
while ((text.length() > 0) && (textSize.x >= rect.width-4)) {
text = text.substring(0, text.length() - 1);
textSize = getCachedStringExtent(gc, text + "...");
addPoint = true;
}
if (addPoint) text = text + "...";
textSize = getCachedStringExtent(gc, text);
if (textSize.x >= rect.width-4) {
text = "";
textSize = getCachedStringExtent(gc, text);
}
gc.setForeground(ResourceManager.getColor(SWT.COLOR_WIDGET_F OREGROUND));
gc.drawText(text, rect.x+3, rect.y+3);
}
public static void drawInvertedHeader(GC gc, Rectangle rect, String text)
{
gc.setBackground(ResourceManager.getColor(220,220,212));
gc.fillRectangle(rect);
gc.setForeground(ResourceManager.getColor(250,250,240));
gc.drawLine(rect.x+1, rect.y+rect.height-2, rect.x+rect.width-1,
rect.y+rect.height-2);
gc.drawLine(rect.x+rect.width-2, rect.y+1, rect.x+rect.width-2,
rect.y+rect.height-3);
gc.setForeground(ResourceManager.getColor(SWT.COLOR_WIDGET_N ORMAL_SHADOW));
gc.drawRectangle(rect.x, rect.y, rect.width-1, rect.height-1);
if (text == null) text = "";
Point textSize = getCachedStringExtent(gc, text);
boolean addPoint = false;
while ((text.length() > 0) && (textSize.x >= rect.width-4)) {
text = text.substring(0, text.length() - 1);
textSize = getCachedStringExtent(gc, text + "...");
addPoint = true;
}
if (addPoint) text = text + "...";
textSize = getCachedStringExtent(gc, text);
if (textSize.x >= rect.width-4) {
text = "";
textSize = getCachedStringExtent(gc, text);
}
gc.setForeground(ResourceManager.getColor(SWT.COLOR_WIDGET_F OREGROUND));
gc.drawText(text, rect.x+4, rect.y+4);
}
--
Friederich Kupzog
Elektronik & Software
Neusser Str. 5-7
50670 Köln
Tel +49 241 9979356
Fax +49 221 726670
www.kupzog.de/fkmk
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