mPDF文档自动高度(POS打印机) [英] mPDF document auto height (POS printer)

问题描述

我正在尝试使用 mPDF类创建PDF文件，我需要将其自动-高度我的文档，而不在底部创建空白.

I'm trying to create a PDF file using mPDF class and I need it to auto-height my document and not create blank spaces at bottom.

这是两个具有不同内容的不同生成的PDF的两个图像.左图比右图具有更多的内容，因此在底部创建了更大的空间.

Here's two images of two different generated PDF with different contents. The left image has more content than the right image, therefore it creates a larger space at the bottom.

我希望它完全没有空间.到目前为止，这是我尝试过的.

I want it to have no space at all. So far, this is what I have tried.

public function __construct()
{
    /*
     * Encoding
     * Size (Array(Xmm, Ymm))
     * Font-size
     * Font-type
     * margin_left
     * margin_right
     * margin_top
     * margin_bottom
     * margin_header
     * margin_footer
     * Orientation
     */
    $this->mPDF = new mPDF('utf-8', array(56, 1000), 9, 'freesans', 2, 2, 2, 0, 0, 0, 'P');
}

它以1000高度的高度开始文档，以使其比起初所需的时间更长.

It starts the document with 1000 height in order to be longer than required at first.

public function write($html, $url)
{   
    /*
     * Writing and remove the content, allows the setAutoTopMargin to work
     *
     * http://www.mpdf1.com/forum/discussion/621/margin-top-problems/p1
     */
    $this->mPDF->WriteHTML($html[0]);
    $pageSizeHeight     = $this->mPDF->y;
    $this->mPDF->page   = 0;
    $this->mPDF->state  = 0;
    unset($this->mPDF->pages[0]);

    foreach($html as $content)
    {
        $this->mPDF->addPage('P', '', '', '', '', 2, 2, 2, 0, 0, 0, '', '', '', '', '', '', '', '', '', array(56, $pageSizeHeight));
        $this->mPDF->WriteHTML($content);
    }

    $this->mPDF->Output($url);
}

因此，如您所见，在某个时候调用函数write()时，我抓住了Y值，以便可以使用它来设置文档高度.不幸的是，它没有执行我期望的操作，即完全填充文档而没有任何空白.

So, as you can see, while calling the function write() at some point I grab the Y value so I can use it to set up the document height. Unfortunately, it does not do what I expect it to do, which is to completely fill the document without any white space.

玩$pageSizeHeight都无济于事，因为它可能对一个文档有效，而对另一个文档无效，就像这样:

Playing with the $pageSizeHeight won't help either because it might work on one document but not on another, like so:

$pageSizeHeight = $this->mPDF->y - 20;

推荐答案

已解决.

我的代码中有一个问题是创建了这么多的空间，它在CSS结构上.

I had one issue in my code that was creating that amount of space and it was on CSS structure.

body { font-size: 80% }

更改为100％可以解决空白，但是我也查看了mPDF类，发现了_setPageSize()函数.

And changing to 100% solved the blank space, but I also look into the mPDF class and I found the _setPageSize() function.

public function write($html, $url)
{   
    /*
     * Writing and remove the content, allows the setAutoTopMargin to work
     *
     * http://www.mpdf1.com/forum/discussion/621/margin-top-problems/p1
     */
    $this->mPDF->WriteHTML($html[0]);
    $this->mPDF->page   = 0;
    $this->mPDF->state  = 0;
    unset($this->mPDF->pages[0]);

    // The $p needs to be passed by reference
    $p = 'P';
    $this->mPDF->_setPageSize(array(56, $this->mPDF->y), $p);

    foreach($html as $content)
    {
        $this->mPDF->addPage();
        $this->mPDF->WriteHTML($content);
    }

    $this->mPDF->Output($url);
}

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