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Xamarin / Guides / Default annotation properties

Default annotation properties

Annotation properties have default settings and can be changed programmatically.

Android

Setting default annotation properties in Xamarin.Android viewer

This tutorial only applies to Xamarin.Android. See Xamarin.iOS equivalent here .
## Programmatically When creating a new annotation, the initial properties (such as line thickness, fill color, opacity, etc.) are set to the last value that the user selected for an annotation of that type. For example, if the user changes an ellipse annotation's stroke color from green to red, the next ellipse annotation that the user creates would have a stroke color of red. These default properties are saved in the app's [SharedPreferences](https://developer.android.com/reference/android/content/SharedPreferences).

These default properties can be changed programmatically and will take effect the next time when the annotation is created.

For example, to change style properties of a rectangle:

var tool = (RectCreate) toolManager.createTool(ToolManager.ToolMode.RectCreate, null);
tool.SetupAnnotProperty(
    Color.Green,
    ToolStyleConfig.Instance.GetCustomOpacity(pdfViewCtrl.Context, (int)Annot.Type.e_Square, ""),
    ToolStyleConfig.Instance.GetCustomThickness(pdfViewCtrl.Context, (int)Annot.Type.e_Square, ""),
    Color.RED,
    null, null
);
where toolManager is an instance of ToolManager.
A table for annotation type and tool mode mapping can be found here: annotation and its creation tool.
XML attributes
Each annotation has a default style that is defined by its creation tool. For example, when you create a Square annotation using the  tool for the first time, the default behavior to draw a rectangle with a red border and a transparent fill color. These default colors can changed through XML attributes.
However the effect will only take place when the app is first loaded.
Set a tool's default style
  1. Add a style to your styles.xml file. For details on supported style attributes, see Tool Style Attributes.
    <style name="ShapeProperty">
    <!-- border color -->
    <item name="annot_color">@android:color/white</item>
    <!-- fill color -->
    <item name="annot_fill_color">@android:color/white</item>
    <!-- thickness -->
    <item name="annot_thickness">1.0</item>
    <!-- opacity -->
    <item name="annot_opacity">1.0</item>
</style>

2. Add the style resource to [`ToolStyleConfig`](/api/xamarinandroid/tools/api/pdftron.PDF.Config.ToolStyleConfig.html) by calling [`AddDefaultStyleMap(Int32, Int32)`](/api/xamarinandroid/tools/api/pdftron.PDF.Config.ToolStyleConfig.html#pdftron_PDF_Config_ToolStyleConfig_AddDefaultStyleMap_System_Int32_System_Int32_).

<div class='info'>
<div class='body'>The first parameter of addDefaultStyleMap is an annotation type. You can determine the annotation type from the creator tool by referring to the <a href="@@tools.tool-manager-android.annot-list">Table of annotations and its creation tool</a>.</div>
</div>

    ```java
    //@data {"m":true}//
    // Add the R.style.ShapeProperty to RectCreate tool.
    // Since the RectCreate tool creates a Square annotation, the annotation type of a Square
    // annotation is Annot.e_Square
    ToolStyleConfig.getInstance().addDefaultStyleMap(Annot.e_Square, R.style.ShapeProperty);
    ```

Tool style attributes
####annot_color
Annotation color. For annotations that have an annot_fill_color, it represents stroke color.
format: color
####annot_text_color
Annotation text color. Used for FreeText annotations.
format: color
annot_fill_color
Annotation fill color. Used for annotations that have fill colors, including  Square, Circle, and  FreeText.
format: color
annot_font_size
Annotation font size. Used for FreeText annotations.
format: float
annot_text_size_max
Represents a FreeText annotation's maximum font size.
format: float
annot_text_size_min
Represents a FreeText annotation's minimum font size.
format: float
annot_thickness
Annotation thickness for border style
format: float
annot_thickness_max
Annotation maximum thickness
format: float
annot_thickness_min
Annotation minimum thickness
format: float
annot_font
Annotation font. Used for FreeText annotations.
format: string
annot_opacity
Annotation opacity
format: float
annot_icon
Annotation icon. Used for Text annotations.
format: string
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