1. 首页
  2. JavaAPI

Java javax.print.attribute.standard Class MediaPrintableArea（JDK8）

163 阅读 0 评论

Skip navigation links
Java™ Platform
Standard Ed. 8
javax.print.attribute.standard

Class MediaPrintableArea

  • All Implemented Interfaces:
    Serializable, Attribute, DocAttribute, PrintJobAttribute, PrintRequestAttribute 

    public final class MediaPrintableArea
extends Object
implements DocAttribute, PrintRequestAttribute, PrintJobAttribute
    Class MediaPrintableArea is a printing attribute used to distinguish the printable and non-printable areas of media.

    The printable area is specified to be a rectangle, within the overall dimensions of a media.

    Most printers cannot print on the entire surface of the media, due to printer hardware limitations. This class can be used to query the acceptable values for a supposed print job, and to request an area within the constraints of the printable area to be used in a print job.

    To query for the printable area, a client must supply a suitable context. Without specifying at the very least the size of the media being used no meaningful value for printable area can be obtained.

    The attribute is not described in terms of the distance from the edge of the paper, in part to emphasise that this attribute is not independent of a particular media, but must be described within the context of a choice of other attributes. Additionally it is usually more convenient for a client to use the printable area.

    The hardware's minimum margins is not just a property of the printer, but may be a function of the media size, orientation, media type, and any specified finishings. PrintService provides the method to query the supported values of an attribute in a suitable context : See PrintService.getSupportedAttributeValues()

    The rectangular printable area is defined thus: The (x,y) origin is positioned at the top-left of the paper in portrait mode regardless of the orientation specified in the requesting context. For example a printable area for A4 paper in portrait or landscape orientation will have height > width.

    A printable area attribute's values are stored internally as integers in units of micrometers (µm), where 1 micrometer = 10-6 meter = 1/1000 millimeter = 1/25400 inch. This permits dimensions to be represented exactly to a precision of 1/1000 mm (= 1 µm) or 1/100 inch (= 254 µm). If fractional inches are expressed in negative powers of two, this permits dimensions to be represented exactly to a precision of 1/8 inch (= 3175 µm) but not 1/16 inch (because 1/16 inch does not equal an integral number of µm).

    IPP Compatibility: MediaPrintableArea is not an IPP attribute.

    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field and Description
      static int INCH
      Value to indicate units of inches (in).
      static int MM
      Value to indicate units of millimeters (mm).

    • Constructor Summary

      Constructors 
      Constructor and Description
      MediaPrintableArea(float x, float y, float w, float h, int units)
      Constructs a MediaPrintableArea object from floating point values.
      MediaPrintableArea(int x, int y, int w, int h, int units)
      Constructs a MediaPrintableArea object from integer values.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      boolean equals(Object object)
      Returns whether this media margins attribute is equivalent to the passed in object.
      Class<? extends Attribute> getCategory()
      Get the printing attribute class which is to be used as the "category" for this printing attribute value.
      float getHeight(int units)
      Get the height of the printable area in the specified units.
      String getName()
      Get the name of the category of which this attribute value is an instance.
      float[] getPrintableArea(int units)
      Get the printable area as an array of 4 values in the order x, y, w, h.
      float getWidth(int units)
      Get the width of the printable area in the specified units.
      float getX(int units)
      Get the x location of the origin of the printable area in the specified units.
      float getY(int units)
      Get the y location of the origin of the printable area in the specified units.
      int hashCode()
      Returns a hash code value for this attribute.
      String toString()
      Returns a string version of this rectangular size attribute in mm.
      String toString(int units, String unitsName)
      Returns a string version of this rectangular size attribute in the given units.

    • Field Detail

      • INCH

        public static final int INCH
        Value to indicate units of inches (in). It is actually the conversion factor by which to multiply inches to yield µm (25400).
        See Also:
        Constant Field Values

      • MM

        public static final int MM
        Value to indicate units of millimeters (mm). It is actually the conversion factor by which to multiply mm to yield µm (1000).
        See Also:
        Constant Field Values

    • Constructor Detail

      • MediaPrintableArea

        public MediaPrintableArea(float x,
                          float y,
                          float w,
                          float h,
                          int units)
        Constructs a MediaPrintableArea object from floating point values.
        Parameters:
        x - printable x
        y - printable y
        w - printable width
        h - printable height
        units - in which the values are expressed.
        Throws:
        IllegalArgumentException - Thrown if x < 0 or y < 0 or w <= 0 or h <= 0 or units < 1.

      • MediaPrintableArea

        public MediaPrintableArea(int x,
                          int y,
                          int w,
                          int h,
                          int units)
        Constructs a MediaPrintableArea object from integer values.
        Parameters:
        x - printable x
        y - printable y
        w - printable width
        h - printable height
        units - in which the values are expressed.
        Throws:
        IllegalArgumentException - Thrown if x < 0 or y < 0 or w <= 0 or h <= 0 or units < 1.

    • Method Detail

      • getPrintableArea

        public float[] getPrintableArea(int units)
        Get the printable area as an array of 4 values in the order x, y, w, h. The values returned are in the given units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        Returns:
        printable area as array of x, y, w, h in the specified units.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • getX

        public float getX(int units)
        Get the x location of the origin of the printable area in the specified units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        Returns:
        x location of the origin of the printable area in the specified units.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • getY

        public float getY(int units)
        Get the y location of the origin of the printable area in the specified units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        Returns:
        y location of the origin of the printable area in the specified units.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • getWidth

        public float getWidth(int units)
        Get the width of the printable area in the specified units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        Returns:
        width of the printable area in the specified units.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • getHeight

        public float getHeight(int units)
        Get the height of the printable area in the specified units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        Returns:
        height of the printable area in the specified units.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • equals

        public boolean equals(Object object)
        Returns whether this media margins attribute is equivalent to the passed in object. To be equivalent, all of the following conditions must be true:
        1. object is not null.
        2. object is an instance of class MediaPrintableArea.
        3. The origin and dimensions are the same.
        Overrides:
        equals in class Object
        Parameters:
        object - Object to compare to.
        Returns:
        True if object is equivalent to this media margins attribute, false otherwise.
        See Also:
        Object.hashCode(), HashMap

      • getCategory

        public final Class<? extends Attribute> getCategory()
        Get the printing attribute class which is to be used as the "category" for this printing attribute value.

        For class MediaPrintableArea, the category is class MediaPrintableArea itself.

        Specified by:
        getCategory in interface Attribute
        Returns:
        Printing attribute class (category), an instance of class java.lang.Class.

      • getName

        public final String getName()
        Get the name of the category of which this attribute value is an instance.

        For class MediaPrintableArea, the category name is "media-printable-area".

        This is not an IPP V1.1 attribute.

        Specified by:
        getName in interface Attribute
        Returns:
        Attribute category name.

      • toString

        public String toString(int units,
                       String unitsName)
        Returns a string version of this rectangular size attribute in the given units.
        Parameters:
        units - Unit conversion factor, e.g. INCH or MM.
        unitsName - Units name string, e.g. "in" or "mm". If null, no units name is appended to the result.
        Returns:
        String version of this two-dimensional size attribute.
        Throws:
        IllegalArgumentException - (unchecked exception) Thrown if units < 1.

      • toString

        public String toString()
        Returns a string version of this rectangular size attribute in mm.
        Overrides:
        toString in class Object
        Returns:
        a string representation of the object.
Skip navigation links
Java™ Platform
Standard Ed. 8

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2022, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

微信小程序

微信扫一扫体验

微信公众账号

微信扫一扫加关注

 发表
评论 返回
顶部