@Override
public void setScrollingRegion(int top, int bottom) {
if (top > bottom) {
LOG.error("Top margin of scroll region can't be greater then bottom: " + top + ">" + bottom);
}
myScrollRegionTop = Math.max(1, top);
myScrollRegionBottom = Math.min(myTerminalHeight, bottom);
// DECSTBM moves the cursor to column 1, line 1 of the page
cursorPosition(1, 1);
}
@Override
public void cursorPosition(int x, int y) {
if (isOriginMode()) {
myCursorY = y + scrollingRegionTop() - 1;
} else {
myCursorY = y;
}
if (myCursorY > scrollingRegionBottom()) {
myCursorY = scrollingRegionBottom();
}
// avoid issue due to malformed sequence
myCursorX = Math.max(0, x - 1);
myCursorX = Math.min(myCursorX, myTerminalWidth - 1);
myCursorY = Math.max(0, myCursorY);
myDisplay.setCursor(myCursorX, myCursorY);
}
@Override
public void cursorUp(final int countY) {
myTerminalTextBuffer.lock();
try {
myCursorY -= countY;
myCursorY = Math.max(myCursorY, scrollingRegionTop());
myDisplay.setCursor(myCursorX, myCursorY);
} finally {
myTerminalTextBuffer.unlock();
}
}
@Override
public int previousTab(int position) {
int tabStop = 0;
// Search for the first tab stop before the given position...
SortedSet<Integer> headSet = myTabStops.headSet(Integer.valueOf(position));
if (!headSet.isEmpty()) {
tabStop = headSet.last();
}
// Don't go beyond the start of the line...
return Math.max(0, tabStop);
}
@Override
public void horizontalTab() {
if (myCursorX >= myTerminalWidth) {
return;
}
int length = myTerminalTextBuffer.getLine(myCursorY - 1).getText().length();
int stop = myTabulator.nextTab(myCursorX);
myCursorX = Math.max(myCursorX, length);
if (myCursorX < stop) {
char[] chars = new char[stop - myCursorX];
Arrays.fill(chars, CharUtils.EMPTY_CHAR);
doWriteString(new String(chars));
} else {
myCursorX = stop;
}
myDisplay.setCursor(myCursorX, myCursorY);
}
protected Point panelToCharCoords(final Point p) {
int x = Math.min(p.x / myCharSize.width, getColumnCount() - 1);
x = Math.max(0, x);
int y = Math.min(p.y / myCharSize.height, getRowCount() - 1) + myClientScrollOrigin;
return new Point(x, y);
}
@Override
public void cursorBackward(final int dX) {
myCursorX -= dX;
myCursorX = Math.max(myCursorX, 0);
myDisplay.setCursor(myCursorX, myCursorY);
}