How to empty a GtkHBox or GtkVBox | PHP-GTK Community

How to empty a GtkHBox or GtkVBox

Ne, 25/07/2004 - 20:40 od Jonathan Gotti

These examples show how to empty instances of classes derived from GtkContainer.

A simple function to empty Box widgets

<?php
function empty_widget($widget) {
  if (count($widget->children()) != 0) { 
    while (($child=$widget->children[0]->widget) != NULL) { 
      $widget->remove($child); 
      } 
    } 
  } 
?>

A more flexible but more complex solution

The next function allow you to use it as a callback function and allow you to preserve the childs widget by passing FALSE as the last parameter.

<?php
/**
 * remove and optionnally destroy all child from a widget
 * @param GtkWidget &$call_widget is the calling widget 
 *     or if is the only Gtkcontainer is the one to empty
 * @param GtkContainer [&$target_widget] is the gtkcontainer 
 *   to empty if only one Gtkwidget is passed and is a 
 *   Gtkcontainer it would be this one by default
 * @param bool $destroy_childs default is TRUE
 *   so the childs widget will be destroy by default,
 *   pass FALSE as last argument to preserve childs widgets
 * @licence LGPL
 **/
function empty_widget(&$call_widget) {
  # If we receive only one arguments it must be the target widget
  $n = func_num_args();
  if($n>1) {
    if (! is_bool($destroy_childs = func_get_arg($n-1)))
      unset($destroy_childs);
    }
  switch($n) {
    case 1:
      if (!is_a($call_widget,"GtkContainer"))
        return FALSE;
      $widget = &$call_widget;
      $destroy_childs = TRUE;
      break;
    case 2:
      if (is_bool($destroy_childs = func_get_arg(1))) {
        if (!is_a($widget = func_get_arg(0),"GtkContainer"))
          return FALSE;
      } elseif (is_a($destroy_childs,"GtkContainer")) {
        $widget = &$destroy_childs;
        $destroy_childs = TRUE;
      } else {
        return FALSE;
      }
      break;
    case 3:
      if (is_bool($destroy_childs = func_get_arg(2)))
        if (!is_a($widget = func_get_arg(1),"GtkContainer"))
          return FALSE;
        else
          return FALSE;
        break;
    default:
      return FALSE;
  }

  if (count($widget->children())!=0) {
    while (is_a(($child=$widget->children[0]->widget),
      "GtkWidget")) {
      $widget->remove($child);
      if($destroy_childs)
        $child->destroy();
      }
    return TRUE;
  } else {
    return FALSE;
  }
}
?>

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