public int getCharacterWidth() {
// create width checker label and add it to the root panel
Label widthChecker = new Label();
widthChecker.setStylePrimaryName(styles_.console());
FontSizer.applyNormalFontSize(widthChecker);
RootPanel.get().add(widthChecker, -1000, -1000);
// put the text into the label, measure it, and remove it
String text = new String("abcdefghijklmnopqrstuvwzyz0123456789");
widthChecker.setText(text);
int labelWidth = widthChecker.getOffsetWidth();
RootPanel.get().remove(widthChecker);
// compute the points per character
int pointsPerCharacter = labelWidth / text.length();
// compute client width
int clientWidth = getElement().getClientWidth();
int offsetWidth = getOffsetWidth();
if (clientWidth == offsetWidth) {
// if the two widths are the same then there are no scrollbars.
// however, we know there will eventually be a scrollbar so we
// should offset by an estimated amount
// (is there a more accurate way to estimate this?)
final int ESTIMATED_SCROLLBAR_WIDTH = 19;
clientWidth -= ESTIMATED_SCROLLBAR_WIDTH;
}
// compute character width (add pad so characters aren't flush to right)
final int RIGHT_CHARACTER_PAD = 2;
int width = (clientWidth / pointsPerCharacter) - RIGHT_CHARACTER_PAD;
// enforce a minimum width
final int MINIMUM_WIDTH = 30;
return Math.max(width, MINIMUM_WIDTH);
}
@Override
public void moveCursorNearTop(int rowOffset) {
int screenRow = getSession().documentToScreenRow(getCursorPosition());
widget_.getEditor().scrollToRow(Math.max(0, screenRow - rowOffset));
}
/** Limits value to [min, max], so that min <= value <= max. */
private static int limit(int min, int value, int max) {
return Math.min(Math.max(min, value), max);
}
