// Separating out the call to append text to a widget so we can work on its
// behavior.
// We'd like this to not scroll if the cursor is not at the bottom of the
// window
// and SWT's append method always scrolls.
private void appendTextToWidget(Text widget, String text) {
// If set this to true we just use standard append
// and always scroll.
boolean kUseAppend = false;
if (kUseAppend) {
widget.append(text);
} else {
// A more sophisticated routine for inserting text
// at the end of the widget without scrolling unless
// current selection is already at the end.
Point currentSelection = widget.getSelection();
int length = widget.getCharCount();
if (currentSelection.x == length) widget.append(text);
else {
// The calls to setRedraw are needed because there's a bug
// on SWT in Windows where setSelection() calls scroll caret
// always
// which it really shouldn't. So we need to suppress that
// behavior by
// turning redraw on and off. However that incurs the cost of
// redrawing the
// entire widget in the setRedraw(true) call which shouldn't be
// needed.
// Because of this we only use this code if the selection isn't
// at the end
// of the widget.
widget.setRedraw(false);
widget.setSelection(length, length);
widget.insert(text);
widget.setSelection(currentSelection);
widget.setRedraw(true);
if (currentSelection.x == length) widget.showSelection();
}
}
}
public boolean isScrolledToBottom() {
Point currentSelection = m_Text.getSelection();
int length = m_Text.getCharCount();
return (currentSelection.x == length);
}
public void scrollBottom() {
// Move the selection to the end and make sure it's visible
int length = m_Text.getCharCount();
m_Text.setSelection(length);
m_Text.showSelection();
}