作者:laruence(
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最近要安排我为BIT提供的《PHP高级应用–关于PHP你不知道的》一门课的讲课素材, 其中有部分涉及到PHP和Gtk2开发桌面应用的部分, 于是抽空就想写一了一个demo出来.
这是一个经典的求24的算法的PHP实现, 加上了Gtk2的界面, 其实也没什么复杂的, 和MFC开发没什么太大的区别, 唯一的不爽, 就是要自己用代码来写布局。。。
完整源代码:
/**
* A 24 maker
* @version 1.0.0
* @author laruence
* @copyright (c) 2009
*/
class
TwentyFourCal
extends
GtkWindow
{
private
$chalkboard;
private
$inputs;
public
$needle = 24;
public
$precision = '1e-6';
function
TwentyFourCal()
{
parent::__construct();
$this->draw();
$this->show();
}
function
draw()
{
$this->set_default_size(200, 200);
$this->set_title("24计算器");
$mesg = new
GtkLabel('Please input 4 integer(0-99):');
$this->chalkboard = new
GtkLabel();
$this->inputs = $inputs = array(
new
GtkEntry(),
new
GtkEntry(),
new
GtkEntry(),
new
GtkEntry()
);
/**
* container
*/
$table = new
GtkTable(4, 1, 0);
$layout = array(
'left' => 0,
'right' => 1,
'top' => 0,
'bottom' => 1,
);
$vBox = new
GtkVBox(false, true);
$vBox->pack_start($mesg);
foreach
(
$inputs
as
$input
)
{
$input->set_max_length(2);
$table->attach($input, $layout['left'], $layout['right'],
$layout['top']++, $layout['bottom']++);
}
$vBox->pack_start($table);
$button = new
GtkButton("Calculate");
$button->connect("clicked", array($this, "calculate"));
$vBox->pack_start($this->chalkboard);
$vBox->pack_start($button, true, false);
$this->add($vBox);
}
function
show()
{
$this->show_all(); // 显示窗体
}
function
notice($mesg)
{
$this->chalkboard->set_text($mesg);
}
function
calculate()
{
$operants = array();
$inputs = $this->inputs;
foreach
($inputs
as
$input)
{
$number = $input->get_text();
if
(!preg_match('/^\s*\d+\s*$/', $number))
{
$this->notice('pleas input for integer(0-99)');
return ;
}
array_push($operants, $number);
}
$length = count($operants);
try
{
$this->search($operants, 4);
}
catch
(Exception
$e)
{
$this->notice($e->getMessage());
return;
}
$this->notice('can\'t computer!');
return;
}
function
search($expressions, $level)
{
if
($level == 1)
{
$result = 'return ' . $expressions[0] . ';';
if
(
abs(eval($result) - $this->needle) <= $this->precision)
{
throw
new
Exception($expressions[0]);
}
}
for
($i=0;$i<$level;$i++)
{
for
($j=$i+1;$j<$level;$j++)
{
$expLeft = $expressions[$i];
$expRight = $expressions[$j];
$expressions[$j] = $expressions[$level - 1];
$expressions[$i] = '(' . $expLeft . ' + ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expLeft . ' * ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expLeft . ' - ' . $expRight . ')';
$this->search($expressions, $level - 1);
$expressions[$i] = '(' . $expRight . ' - ' . $expLeft . ')';
$this->search($expressions, $level - 1);
if
($expLeft != 0)
{
$expressions[$i] = '(' . $expRight . ' / ' . $expLeft . ')';
$this->search($expressions, $level - 1);
}
if
($expRight != 0)
{
$expressions[$i] = '(' . $expLeft . ' / ' . $expRight . ')';
$this->search($expressions, $level - 1);
}
$expressions[$i] = $expLeft;
$expressions[$j] = $expRight;
}
}
return
false;
}
function
__destruct()
{
Gtk::main_quit();
}
}
new
TwentyFourCal();
Gtk::main(); //进入GTK主循环
?>
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