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Xamarin.Forms

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Document Viewer

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Reference

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PDF Processing API

Reflow

In this document
chevron_rightShowing reflow pager
chevron_rightImplementation
chevron_rightPost-processing color
chevron_rightNotifying the reflow pager that the document has been modified
chevron_rightSetting the text size
chevron_rightSetting background color
chevron_rightSetting right-to-left direction
chevron_rightGenerating a reflow page
This tutorial only applies to Xamarin.Android.
Reflow requires the full version of PDFTron library. See PDFTron full or standard?

Reflow makes the document more flexible and easier to read, especially on small devices. PDFTron is able to extract the reflowable layout of each page in a PDF document to an HTML file. First, we explain how simple it is to show a widget that allows the user to swipe left or right through the pages of the document to see reflowable document pages. Then, we provide the methods necessary for converting a hard-layout PDF page to an HTML document page.

linkShowing reflow pager

ReflowControl is a ViewPager that allows the user to flip left and right through the reflowable layout of pages in a PDF document.

linkImplementation

To set up your layout with ReflowControl, add a <ReflowControl> element to your XML layout. For example, if each page in the swipe view should consume the entire layout, then your layout looks like this:

<pdftron.PDF.Controls.ReflowControl
    android:id="@+id/reflow"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Then, you need to attach a PDFDoc to the reflow pager:


That is everything you need to have a simple reflow pager.

linkNotifying the reflow pager that the document has been modified

To refresh the reflow pager to show the latest changes on your document, you should let the reflow pager know that the document has been modified:

linkSetting the text size

It is possible to change the size of reflowable text. The default text size is 100; valid values are 5, 10, 25, 50, 75, 100, 125, 150, 200, 400, 800, and 1600. See the following code as an example:

Alternatively, you can zoom in/out to change the reflowable text size:

Assuming the current text size is 100%, by calling zoomReflow(reflowControl, true) and zoomReflow(reflowControl, false) the new text size will be 125% and 75% of the original size, respectively.

linkSetting background color

There are three methods to change the background color:

setDayMode(): no background

setNightMode(): night background

setCustomColorMode(int): customized background

linkSetting right-to-left direction

You can support right-to-left languages by setting the direction of reflowable text by calling RightToLeftDirection