private ProperTextRange offsetToYPosition(int start, int end) {
if (myEditorScrollbarTop == -1 || myEditorTargetHeight == -1) {
recalcEditorDimensions();
}
Document document = myEditor.getDocument();
int startLineNumber = offsetToLine(start, document);
int startY;
int lineCount;
if (myEditorSourceHeight < myEditorTargetHeight) {
lineCount = 0;
startY = myEditorScrollbarTop + startLineNumber * myEditor.getLineHeight();
} else {
lineCount = myEditorSourceHeight / myEditor.getLineHeight();
startY =
myEditorScrollbarTop + (int) ((float) startLineNumber / lineCount * myEditorTargetHeight);
}
int endY;
if (document.getLineNumber(start) == document.getLineNumber(end)) {
endY = startY; // both offsets are on the same line, no need to recalc Y position
} else {
int endLineNumber = offsetToLine(end, document);
if (myEditorSourceHeight < myEditorTargetHeight) {
endY = myEditorScrollbarTop + endLineNumber * myEditor.getLineHeight();
} else {
endY =
myEditorScrollbarTop + (int) ((float) endLineNumber / lineCount * myEditorTargetHeight);
}
if (endY < startY) endY = startY;
}
return new ProperTextRange(startY, endY);
}
private int yPositionToOffset(int y, boolean beginLine) {
if (myEditorScrollbarTop == -1 || myEditorTargetHeight == -1) {
recalcEditorDimensions();
}
final int safeY = Math.max(0, y - myEditorScrollbarTop);
VisualPosition visual;
if (myEditorSourceHeight < myEditorTargetHeight) {
visual = myEditor.xyToVisualPosition(new Point(0, safeY));
} else {
float fraction = Math.max(0, Math.min(1, safeY / (float) myEditorTargetHeight));
final int lineCount = myEditorSourceHeight / myEditor.getLineHeight();
visual = new VisualPosition((int) (fraction * lineCount), 0);
}
int line = myEditor.visualToLogicalPosition(visual).line;
Document document = myEditor.getDocument();
if (line < 0) return 0;
if (line >= document.getLineCount()) return document.getTextLength();
return beginLine ? document.getLineStartOffset(line) : document.getLineEndOffset(line);
}
