/**
* Returns the top pixel.
*
* <p>The top pixel is the pixel position of the line that is currently at the top of the widget.
* On some platforms, a text widget can be scrolled by pixels instead of lines so that a partial
* line is displayed at the top of the widget.
*
* <p>The top pixel changes when the widget is scrolled. The top pixel does not include the widget
* trimming.
*
* @return the pixel position of the top line
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public int getTopPixel() {
checkWidget();
if (variant == TextUtils.LINE_EDIT) {
return 0;
} else {
return OS.QScrollBar_value(OS.QAbstractScrollArea_verticalScrollBar(scrollAreaHandle));
}
}
/**
* Sets the contents of the receiver to the given string. If the receiver has style SINGLE and the
* argument contains multiple lines of text, the result of this operation is undefined and may
* vary from platform to platform.
*
* @param string the new text
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null
* </ul>
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public void setText(String string) {
checkWidget();
TextUtils.setText(variant, topHandle, string, textLimit, this);
if (isDisposed()) return;
if (variant == TextUtils.TEXT_EDIT) {
OS.QScrollBar_setValue(OS.QAbstractScrollArea_verticalScrollBar(scrollAreaHandle), 0);
}
}