ZoomIncrement Property

FlowDocumentReader.ZoomIncrement Property


Gets or sets the zoom increment.

Namespace:   System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public double ZoomIncrement { get; set; }

Property Value

Type: System.Double

The current zoom increment, interpreted as a percentage. The default is 10.0 (zoom increment of 10%).

The zoom increment is the percentage by which the Zoom level is increased or decreased when the IncreaseZoom or DecreaseZoom commands are executed, respectively.

Default FlowDocumentReader user interface (UI) includes a zoom control that provides buttons for increasing or decreasing the zoom, as well as a slider for adjusting the zoom level. The following figure shows the zoom controls on a FlowDocumentReader with default UI.

FlowDocumentReader content zoom

Identifier field


Metadata properties set to true


The following example shows how to set the ZoomIncrement attribute.

  MinZoom="50" MaxZoom="1000"
  Zoom="120" ZoomIncrement="5"
      Flow content...

The following example shows how to set the ZoomIncrement property programmatically.

FlowDocumentReader flowDocRdr = new FlowDocumentReader();

// Enable find...
flowDocRdr.IsFindEnabled = true;
// Enable printing...
flowDocRdr.IsPrintEnabled = true;
// Set zoom between 50% and 1000%.
flowDocRdr.MinZoom = 50;
flowDocRdr.MaxZoom = 1000;
// Set the zoom increment to 5%.
flowDocRdr.ZoomIncrement = 5;
// Set the initial zoom to 120%.
flowDocRdr.Zoom = 120;

FlowDocument flowDoc = new FlowDocument(new Paragraph(new Run("Flow content...")));
flowDocRdr.Document = flowDoc;

.NET Framework
Available since 3.0
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