Reflow makes the document more flexible and easier to read, especially on small devices. Apryse 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.

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

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:

var reflowControl = FindViewById<ReflowControl>(Resource.Id.reflow);
reflowControl.Setup(pdfDoc);

// horizontal (default)
reflowControl.Orientation = ReflowControl.Horizontal;
// vertical
reflowControl.Orientation = ReflowControl.Vertical;

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:

void NotifyReflowModified(ReflowControl reflowControl)
{
    if (reflowControl != null && reflowControl.IsReady) {
        reflowControl.NotifyPagesModified();
    }
}

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:

void ChangeReflowSize(ReflowControl reflowControl, int percent)
{
    if (reflowControl != null && reflowControl.IsReady)
    {
        reflowControl.TextSizeInPercent = percent;
    }
}

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

void ZoomReflow(ReflowControl reflowControl, bool zoomIn)
{
    if (reflowControl != null && reflowControl.IsReady) {
        if (zoomIn) {
            reflowControl.ZoomIn();
        } else {
            reflowControl.ZoomOut();
        }
    }
}

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.

There are three methods to change the background color:

setDayMode(): no background

setNightMode(): night background

setCustomColorMode(int): customized background

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