/**
* Sets the alternative text to be displayed in the TImage when the image is unavailable.
* @param string the alternative text
*/
public function setAlternateText($value)
{
if (parent::getAlternateText() === $value) {
return;
}
parent::setAlternateText($value);
if ($this->getActiveControl()->canUpdateClientSide()) {
$this->getPage()->getCallbackClient()->setAttribute($this, 'alt', $value);
}
}
/**
* Initializes the header cell.
*
* This method attempts to use {@link getHeaderRenderer HeaderRenderer} to
* instantiate the header cell. If that is not available, it will populate
* the cell with an image or a text string, depending on {@link getHeaderImageUrl HeaderImageUrl}
* and {@link getHeaderText HeaderText} property values.
*
* If the column allows sorting, image or text will be created as
* a button which issues <b>Sort</b> command upon user click.
*
* @param TTableCell the cell to be initialized
* @param integer the index to the Columns property that the cell resides in.
*/
protected function initializeHeaderCell($cell, $columnIndex)
{
$text = $this->getHeaderText();
if (($classPath = $this->getHeaderRenderer()) !== '') {
$control = Prado::createComponent($classPath);
$cell->getControls()->add($control);
if ($control instanceof \Prado\IDataRenderer) {
if ($control instanceof IItemDataRenderer) {
$item = $cell->getParent();
$control->setItemIndex($item->getItemIndex());
$control->setItemType($item->getItemType());
}
$control->setData($text);
}
} else {
if ($this->getAllowSorting()) {
$sortExpression = $this->getSortExpression();
if (($url = $this->getHeaderImageUrl()) !== '') {
$button = new TImageButton();
$button->setImageUrl($url);
$button->setCommandName(TDataGrid::CMD_SORT);
$button->setCommandParameter($sortExpression);
if ($text !== '') {
$button->setAlternateText($text);
}
$button->setCausesValidation(false);
$cell->getControls()->add($button);
} else {
if ($text !== '') {
$button = new TLinkButton();
$button->setText($text);
$button->setCommandName(TDataGrid::CMD_SORT);
$button->setCommandParameter($sortExpression);
$button->setCausesValidation(false);
$cell->getControls()->add($button);
} else {
$cell->setText(' ');
}
}
} else {
if (($url = $this->getHeaderImageUrl()) !== '') {
$image = new TImage();
$image->setImageUrl($url);
if ($text !== '') {
$image->setAlternateText($text);
}
$cell->getControls()->add($image);
} else {
if ($text !== '') {
$cell->setText($text);
} else {
$cell->setText(' ');
}
}
}
}
}
