private boolean onAltLeft(KeyboardEvent event) {
if (noContent()) return true;
final Object item = selected();
if (item == null) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
final String line = appearance.getScreenAppearance(item, NONE_APPEARANCE_FLAGS);
NullCheck.notNull(line, "line");
if (line.isEmpty()) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
final int leftBound = appearance.getObservableLeftBound(item);
final int rightBound = appearance.getObservableRightBound(item);
if (hotPointX <= leftBound) {
environment.hint(Hints.BEGIN_OF_LINE);
return true;
}
final String subline = line.substring(leftBound, rightBound);
final WordIterator it = new WordIterator(subline, hotPointX - leftBound);
if (!it.stepBackward()) {
environment.hint(Hints.BEGIN_OF_LINE);
return true;
}
hotPointX = it.pos() + leftBound;
environment.say(it.announce());
environment.onAreaNewHotPoint(this);
return true;
}
private boolean onAltEnd(KeyboardEvent event) {
if (noContent()) return true;
final Object item = selected();
if (item == null) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
final String line = appearance.getScreenAppearance(item, NONE_APPEARANCE_FLAGS);
NullCheck.notNull(line, "line");
hotPointX = appearance.getObservableRightBound(item);
environment.hint(Hints.END_OF_LINE);
environment.onAreaNewHotPoint(this);
return true;
}
protected boolean noContent() {
if (model == null || model.getItemCount() < 1) {
environment.hint(noContentStr(), Hints.NO_CONTENT);
return true;
}
return false;
}
private boolean onArrowLeft(KeyboardEvent event) {
if (noContentCheck()) return true;
final int count = model.getRowCount();
if (hotPointY < 0 || hotPointY >= count) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
if (hotPointX < initialHotPointX) hotPointX = initialHotPointX;
if (getColUnderPos(hotPointX) < 0) hotPointX = initialHotPointX;
final int currentCol = getColUnderPos(hotPointX);
final int currentColWidth = colWidth[currentCol];
final int colStartPos = getColStartPos(currentCol);
final TableCell c =
new TableCell(
hotPointX - colStartPos,
cellShift,
currentColWidth,
appearance.getCellText(model, currentCol, hotPointY));
if (!c.movePrev()) {
if (currentCol <= 0) {
environment.hint(Hints.TABLE_BEGIN_OF_ROW);
return true;
}
final String prevColText = appearance.getCellText(model, currentCol - 1, hotPointY);
final int prevColWidth = colWidth[currentCol - 1];
final int prevColStartPos = getColStartPos(currentCol - 1);
if (prevColText.length() > prevColWidth) {
hotPointX = prevColStartPos + prevColWidth;
cellShift = prevColText.length() - prevColWidth;
} else {
cellShift = 0;
hotPointX = prevColStartPos + prevColText.length();
}
environment.hint(Hints.TABLE_END_OF_COL);
environment.onAreaNewContent(this);
environment.onAreaNewHotPoint(this);
return true;
}
cellShift = c.shift;
hotPointX = c.pos + colStartPos;
if (c.pos == c.width) // Should never happen;
environment.hint(Hints.TABLE_END_OF_COL);
else environment.sayLetter(c.line.charAt(c.pos + c.shift));
environment.onAreaNewContent(this);
environment.onAreaNewHotPoint(this);
return true;
}
private boolean onArrowRight(KeyboardEvent event) {
if (noContentCheck()) return true;
final int count = model.getRowCount();
if (hotPointY < 0 || hotPointY >= count) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
// Checking that hot point not before proper line begin;
if (hotPointX < initialHotPointX) hotPointX = initialHotPointX;
if (getColUnderPos(hotPointX) < 0) hotPointX = initialHotPointX;
final int currentCol = getColUnderPos(hotPointX);
final int currentColWidth = colWidth[currentCol];
final int colStartPos = getColStartPos(currentCol);
final int nextColStartPos = colStartPos + colWidth[currentCol] + 1;
final TableCell c =
new TableCell(
hotPointX - colStartPos,
cellShift,
currentColWidth,
appearance.getCellText(model, currentCol, hotPointY));
if (!c.moveNext()) {
if (currentCol + 1 >= colWidth.length) {
environment.hint(Hints.TABLE_END_OF_ROW);
return true;
}
cellShift = 0;
hotPointX = nextColStartPos;
final String nextColText = appearance.getCellText(model, currentCol + 1, hotPointY);
if (!nextColText.isEmpty()) environment.sayLetter(nextColText.charAt(0));
else
environment.hint(
currentCol + 2 < colWidth.length ? Hints.TABLE_END_OF_COL : Hints.TABLE_END_OF_ROW);
environment.onAreaNewContent(this);
environment.onAreaNewHotPoint(this);
return true;
}
cellShift = c.shift;
hotPointX = c.pos + colStartPos;
if (c.pos + c.shift >= c.line.length())
environment.hint(
currentCol + 1 < colWidth.length ? Hints.TABLE_END_OF_COL : Hints.TABLE_END_OF_ROW);
else environment.sayLetter(c.line.charAt(c.pos + c.shift));
environment.onAreaNewContent(this);
environment.onAreaNewHotPoint(this);
return true;
}
private void onNewHotPointY(boolean briefIntroduction) {
final int count = model.getRowCount();
hotPointX = hotPointY < count ? initialHotPointX : 0;
cellShift = 0;
environment.onAreaNewHotPoint(this);
if (hotPointY < count)
appearance.introduceRow(model, hotPointY, briefIntroduction ? INTRODUCTION_BRIEF : 0);
else environment.hint(Hints.EMPTY_LINE);
}
protected boolean onAnnounceLine() {
if (isEmpty()) return false;
final Object item = selected();
if (item == null) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
appearance.announceItem(item, NONE_APPEARANCE_FLAGS);
return true;
}
private boolean onArrowDown(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
final int count = model.getRowCount();
if (hotPointY >= count) {
environment.hint(Hints.TABLE_NO_ROWS_BELOW);
return true;
}
++hotPointY;
onNewHotPointY(briefIntroduction);
return true;
}
protected void onNewHotPointY(boolean briefAnnouncement) {
final int index = selectedIndex();
if (index < 0) {
environment.hint(Hints.EMPTY_LINE);
hotPointX = 0;
environment.onAreaNewHotPoint(this);
return;
}
final Object item = model.getItem(index);
if (item == null) {
environment.hint(Hints.EMPTY_LINE);
hotPointX = 0;
environment.onAreaNewHotPoint(this);
return;
}
appearance.announceItem(
item, briefAnnouncement ? BRIEF_ANNOUNCEMENT_ONLY : NONE_APPEARANCE_FLAGS);
hotPointX = appearance.getObservableLeftBound(item);
environment.onAreaNewHotPoint(this);
}
protected boolean onArrowRight(KeyboardEvent event) {
if (noContent()) return true;
final Object item = selected();
NullCheck.notNull(item, "item");
final String line = appearance.getScreenAppearance(item, NONE_APPEARANCE_FLAGS);
NullCheck.notNull(line, "line");
if (line.isEmpty()) {
environment.hint(Hints.EMPTY_LINE);
return true;
}
final int rightBound = appearance.getObservableRightBound(item);
if (hotPointX >= rightBound) {
environment.hint(Hints.END_OF_LINE);
return true;
}
++hotPointX;
announceChar(line, hotPointX, rightBound);
environment.onAreaNewHotPoint(this);
return true;
}
private boolean onPageUp(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
if (hotPointY <= 0) {
environment.hint(Hints.TABLE_NO_ROWS_ABOVE);
return true;
}
hotPointY -= environment.getAreaVisibleHeight(this);
if (hotPointY < 0) hotPointY = 0;
onNewHotPointY(briefIntroduction);
return true;
}
private boolean onPageDown(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
final int count = model.getRowCount();
if (hotPointY >= count) {
environment.hint(Hints.TABLE_NO_ROWS_BELOW);
return true;
}
hotPointY += environment.getAreaVisibleHeight(this);
if (hotPointY >= count) hotPointY = count;
onNewHotPointY(briefIntroduction);
return true;
}
private boolean onArrowUp(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
final int count = model.getRowCount();
if (hotPointY <= 0) {
environment.hint(Hints.TABLE_NO_ROWS_ABOVE);
return true;
}
--hotPointY;
if (hotPointY >= count) hotPointY = count - 1;
onNewHotPointY(briefIntroduction);
return true;
}
/**
* Selects the item by its index. Given the non-negative integer value as an index, this method
* sets the hot point on the item addressed with this index, checking only that index is in
* appropriate bounds. Index must address the object as a number in the model, ignoring any empty
* lines.
*
* @param index The item index to select
* @param announce Must be true, if it is necessary to announce the item , once it has been
* selected
* @return True if the index is valid and the item gets hot point on it
*/
public boolean select(int index, boolean announce) {
if (index < 0 || index >= model.getItemCount()) return false;
final int emptyCountAbove = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
hotPointY = index + emptyCountAbove;
final Object item = model.getItem(index);
if (item != null) {
hotPointX = appearance.getObservableLeftBound(item);
if (announce) appearance.announceItem(item, NONE_APPEARANCE_FLAGS);
} else {
hotPointX = 0;
if (announce) environment.hint(Hints.EMPTY_LINE);
}
environment.onAreaNewHotPoint(this);
return true;
}
protected boolean onTransition(Transition.Type type, int hint, boolean briefAnnouncement) {
NullCheck.notNull(type, "type");
// NullCheck.notNull(hint, "hint");
if (noContent()) return true;
final int index = selectedIndex();
final int count = model.getItemCount();
final int emptyCountTop = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
final Transition.State current;
if (index >= 0) current = new Transition.State(index);
else if (flags.contains(Flags.EMPTY_LINE_TOP) && hotPointY == 0)
current = new Transition.State(Transition.State.Type.EMPTY_LINE_TOP);
else if (flags.contains(Flags.EMPTY_LINE_BOTTOM) && hotPointY == count + emptyCountTop)
current = new Transition.State(Transition.State.Type.EMPTY_LINE_BOTTOM);
else return false;
final Transition.State newState =
transition.transition(
type,
current,
count,
flags.contains(Flags.EMPTY_LINE_TOP),
flags.contains(Flags.EMPTY_LINE_BOTTOM));
NullCheck.notNull(newState, "newState");
Log.debug("list", "newState=" + newState.type);
switch (newState.type) {
case NO_TRANSITION:
environment.hint(hint);
return true;
case EMPTY_LINE_TOP:
if (!flags.contains(Flags.EMPTY_LINE_TOP)) return false;
hotPointY = 0;
break;
case EMPTY_LINE_BOTTOM:
if (!flags.contains(Flags.EMPTY_LINE_BOTTOM)) return false;
hotPointY = count + emptyCountTop;
break;
case ITEM_INDEX:
if (newState.itemIndex < 0 || newState.itemIndex >= count) return false;
hotPointY = newState.itemIndex + emptyCountTop;
break;
default:
return false;
}
onNewHotPointY(briefAnnouncement);
return true;
}
public void resetHotPoint(boolean introduce) {
hotPointY = 0;
final int count = model.getItemCount();
if (count < 1) {
hotPointX = 0;
environment.onAreaNewHotPoint(this);
return;
}
final Object item = model.getItem(0);
if (item != null) {
hotPointX = item != null ? appearance.getObservableLeftBound(item) : 0;
if (introduce) appearance.announceItem(item, NONE_APPEARANCE_FLAGS);
} else {
hotPointX = 0;
environment.hint(Hints.EMPTY_LINE);
}
environment.onAreaNewHotPoint(this);
}
private boolean noContentCheck() {
if (!noProperContent()) return false;
environment.hint(environment.staticStr(LangStatic.TABLE_NO_CONTENT), Hints.NO_CONTENT);
return true;
}
protected void announceChar(String line, int pos, int rightBound) {
NullCheck.notNull(line, "line");
if (pos < rightBound) environment.sayLetter(line.charAt(pos));
else environment.hint(Hints.END_OF_LINE);
}