Class Page

Page is a high-level class representing PDF page object (see 'Page Objects' in Section 3.6.2, 'Page Tree,' in PDF Reference Manual).

Among other associated objects, a page object contains:

• A series of objects representing the objects drawn on the page (See Element and ElementReader class for examples of how to extract page content).
• A list of resources used in drawing the page
• Annotations
• Beads, private metadata, optional thumbnail image, etc.

Inheritance

System.Object

Page

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ToString()

System.Object.ReferenceEquals(System.Object, System.Object)

Namespace: pdftron.PDF

Assembly: PDFNetiOS.dll

Syntax

public class Page

Constructors

Page(Obj)

Instantiates a new page.

Declaration

public Page(Obj page_dict)

Parameters

Type	Name	Description
Obj	page_dict	the page_dict

Methods

AddRotations(Page.Rotate, Page.Rotate)

Rotate r0 clockwise by r1

Declaration

public static Page.Rotate AddRotations(Page.Rotate r0, Page.Rotate r1)

Parameters

Type	Name	Description
Page.Rotate	r0	r0 first rotation.
Page.Rotate	r1	r1 second rotation.

Returns

Type	Description
Page.Rotate	returns r0 + r1

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

AnnotInsert(Int32, Annot)

Adds an annotation at the specified location in a page's annotation array.

Declaration

public void AnnotInsert(int pos, Annot annot)

Parameters

Type	Name	Description
System.Int32	pos	location in the array to insert the object. The object is inserted before the specified location. The first element in an array has a pos of zero. If pos >= GetNumAnnots(), the method appends the annotation to the array.
Annot	annot	annotation to add.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

AnnotPushBack(Annot)

Adds an annotation to the end of a page's annotation array.

Declaration

public void AnnotPushBack(Annot annot)

Parameters

Type	Name	Description
Annot	annot	The annotation to prepend in a page's annotation array.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

AnnotPushFront(Annot)

Adds an annotation to the beginning of a page's annotation array.

Declaration

public void AnnotPushFront(Annot annot)

Parameters

Type	Name	Description
Annot	annot	The annotation to append in a page's annotation array.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

AnnotRemove(Annot)

Removes the given annoation from the page.

Declaration

public void AnnotRemove(Annot annot)

Parameters

Type	Name	Description
Annot	annot	the annot

Remarks

Removing the annotation invalidates the given Annot object.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

AnnotRemove(Int32)

Removes the annoation at a given location.

Declaration

public void AnnotRemove(int pos)

Parameters

Type	Name	Description
System.Int32	pos	A zero based index of the annotation to remove.

Remarks

Removing the annotation invalidates any associated Annot object.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

CreateInternal(IntPtr, Object)

Create a new page object using native impl pointer For internal use only.

Declaration

public static Page CreateInternal(IntPtr imp, object reference)

Parameters

Type	Name	Description
System.IntPtr	imp	impl pointer from PDFNet core.
System.Object	reference

Returns

Type	Description
Page

DegreeToRotation(Int32)

Convert a number that represents rotation in degrees to a rotation enum.

Declaration

public static Page.Rotate DegreeToRotation(int r)

Parameters

Type	Name	Description
System.Int32	r	degree to convert to rotation. Valid numbers are multiples of 90.

Returns

Type	Description
Page.Rotate	one of four angles; e_0, e_90, e_180 or e_270. Returns e_0 if input is not a multiple 90.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

FindInheritedAttribute(String)

Some of the page attributes are designated as inheritable. If such an attribute is omitted from a page object, its value is inherited from an ancestor node in the page tree. If the attribute is a required one, a value must be supplied in an ancestor node; if it is optional and no inherited value is specified, the default value should be used.

The function walks up the page inhritance tree in search for specified attribute.

Declaration

public Obj FindInheritedAttribute(string attrib)

Parameters

Type	Name	Description
System.String	attrib	the attrib

Returns

Type	Description
Obj	if the attribute was found return a pointer to the value. otherwise the function return NULL. Resources dictionary (Required; inheritable) MediaBox rectangle (Required; inheritable) CropBox rectangle (Optional; inheritable) Rotate integer (Optional; inheritable)

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

FlattenField(Field)

Flatten/Merge existing form field appearances with the page content and remove widget annotation.

Form 'flattening' refers to the operation that changes active form fields into a static area that is part of the PDF document, just like the other text and images in the document. A completely flattened PDF form does not have any widget annotations or interactive fields.

Declaration

public void FlattenField(Field field)

Parameters

Type	Name	Description
Field	field	the field

Remarks

An alternative approach to set the field as read only is using Field.SetFlag(Field::e_read_only, true) method. Unlike Field.SetFlag(...), the result of FlattenField() operation can not be programatically reversed.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetAnnot(Int32)

Gets the annotation on the page.

Declaration

public Annot GetAnnot(int index)

Parameters

Type	Name	Description
System.Int32	index	index of the annotation to get on a page

Returns

Type	Description
Annot	Annotation object. If the index is out of range returned Annot object is not valid (i.e. annot.IsValid() returns false).

Remarks

The first annotation on a page has an index of zero

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetAnnots()

Gets the annotation on the page.

Declaration

public Obj GetAnnots()

Returns

Type	Description
Obj	Annotation object. If the index is out of range returned Annot object is not valid (i.e. annot.IsValid() returns false).

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetBox(Page.Box)

Gets the specified box

Declaration

public Rect GetBox(Page.Box type)

Parameters

Type	Name	Description
Page.Box	type	The type of the page bounding box. Possible values are: e_media, e_crop, e_bleed, e_trim, and e_art.

Returns

Type	Description
Rect	the box specified for the page object intersected with the media box.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetContents()

Gets the contents.

Declaration

public Obj GetContents()

Returns

Type	Description
Obj	NULL if page is empty, otherwise a single stream or an array of streams.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetCropBox()

Gets the crop box.

Declaration

public Rect GetCropBox()

Returns

Type	Description
Rect	the crop box for this page. The page dimensions are specified in user space coordinates. The crop box is the region of the page to display and print.

Remarks

this method is equivalent to GetBox(Page::e_crop)

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetDefaultMatrix()

Gets the default matrix.

Declaration

public Matrix2D GetDefaultMatrix()

Returns

Type	Description
Matrix2D	the matrix that transforms user space coordinates to rotated and cropped coordinates. The origin of this space is the bottom-left of the rotated, cropped page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetDefaultMatrix(Boolean)

Gets the default matrix.

Declaration

public Matrix2D GetDefaultMatrix(bool flip)

Parameters

Type	Name	Description
System.Boolean	flip	this parameter can be used to mirror the page. if 'flip_y' is true the Y axis is not flipped and it is increasing, otherwise Y axis is decreasing.

Returns

Type	Description
Matrix2D	the matrix that transforms user space coordinates to rotated and cropped coordinates. The origin of this space is the bottom-left of the rotated, cropped page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetDefaultMatrix(Boolean, Page.Box)

Gets the default matrix.

Declaration

public Matrix2D GetDefaultMatrix(bool flip, Page.Box region)

Parameters

Type	Name	Description
System.Boolean	flip	this parameter can be used to mirror the page. if 'flip_y' is true the Y axis is not flipped and it is increasing, otherwise Y axis is decreasing.
Page.Box	region	an optional parameter used to specify the page box/region that the matrix should map to. By default, the function transforms user space coordinates to cropped coordinates.

Returns

Type	Description
Matrix2D	the matrix that transforms user space coordinates to rotated and cropped coordinates. The origin of this space is the bottom-left of the rotated, cropped page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetDefaultMatrix(Boolean, Page.Box, Page.Rotate)

Gets the default matrix.

Declaration

public Matrix2D GetDefaultMatrix(bool flip, Page.Box region, Page.Rotate rot)

Parameters

Type	Name	Description
System.Boolean	flip	this parameter can be used to mirror the page. if 'flip_y' is true the Y axis is not flipped and it is increasing, otherwise Y axis is decreasing.
Page.Box	region	an optional parameter used to specify the page box/region that the matrix should map to. By default, the function transforms user space coordinates to cropped coordinates.
Page.Rotate	rot	the rot_type

Returns

Type	Description
Matrix2D	the matrix that transforms user space coordinates to rotated and cropped coordinates. The origin of this space is the bottom-left of the rotated, cropped page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetIndex()

Gets the index.

Declaration

public int GetIndex()

Returns

Type	Description
System.Int32	the Page number indication the position of this Page in document's page sequence. Document's page sequence is indexed from 1. Page number 0 means that the page is not part of document's page sequence or that the page is not valid.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetMediaBox()

Gets the media box.

Declaration

public Rect GetMediaBox()

Returns

Type	Description
Rect	the media box for this page. The page dimensions are specified in user space coordinates. The media box defines the boundaries of the physical medium on which the page is to be printed. It may include any extended area surrounding the finished page for bleed, printing marks, or other such purposes.

Remarks

this method is equivalent to GetBox(Page::e_media)

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetNumAnnots()

Gets the number of annotations on a page. Widget annotations (form fields) are included in the count.

Declaration

public int GetNumAnnots()

Returns

Type	Description
System.Int32	number of annotations on a page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetPageHeight()

Gets the page height.

Declaration

public double GetPageHeight()

Returns

Type	Description
System.Double	the height for the given page region/box taking into account page rotation attribute (i.e. /Rotate entry in page dictionary).

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetPageHeight(Page.Box)

Gets the page height.

Declaration

public double GetPageHeight(Page.Box region)

Parameters

Type	Name	Description
Page.Box	region	the box_type

Returns

Type	Description
System.Double	the page height

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetPageWidth()

Gets the page width.

Declaration

public double GetPageWidth()

Returns

Type	Description
System.Double	the width for the given page region/box taking into account page rotation attribute (i.e. /Rotate entry in page dictionary).

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetPageWidth(Page.Box)

Gets the page width.

Declaration

public double GetPageWidth(Page.Box region)

Parameters

Type	Name	Description
Page.Box	region	the box_type

Returns

Type	Description
System.Double	the page width

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetResourceDict()

Gets the resource dictionary.

Declaration

public Obj GetResourceDict()

Returns

Type	Description
Obj	a pointer to the page resource dictionary.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetRotation()

Gets the rotation.

Declaration

public Page.Rotate GetRotation()

Returns

Type	Description
Page.Rotate	the rotation value for this page.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetSDFObj()

Gets the page dictionary.

Declaration

public Obj GetSDFObj()

Returns

Type	Description
Obj	the object to the underlying SDF/Cos object.

GetThumb()

Declaration

public Obj GetThumb()

Returns

Type	Description
Obj

GetUserUnitSize()

Gets the UserUnit value for the page. A UserUnit is a positive number giving the size of default user space units, in multiples of 1/72 inch.

Declaration

public double GetUserUnitSize()

Returns

Type	Description
System.Double	the UserUnit value for the page. If the key is not present in the page dictionary the default of 1.0 is returned.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

GetVisibleContentBox()

The bounding box is defined as the smallest rectangle that includes all the visible content on the page.

Declaration

public Rect GetVisibleContentBox()

Returns

Type	Description
Rect	the bounding box for this page. The page dimensions are specified in user space coordinates.

HasTransition()

Tests whether this page has a transition.

Declaration

public bool HasTransition()

Returns

Type	Description
System.Boolean	true, if successful

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

IsValid()

Checks if is valid.

Declaration

public bool IsValid()

Returns

Type	Description
System.Boolean	true if this is a valid (non-null) page, false otherwise. If the function returns false the underlying SDF/Cos object is null or is not valid.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

op_Assign(Page)

Assignment operator

Declaration

public Page op_Assign(Page r)

Parameters

Type	Name	Description
Page	r	a given Page object

Returns

Type	Description
Page	a Page equals to the given Page object

RotationToDegree(Page.Rotate)

Convert a rotation to a number.

Declaration

public static int RotationToDegree(Page.Rotate r)

Parameters

Type	Name	Description
Page.Rotate	r	rotation to convert to number

Returns

Type	Description
System.Int32	one of four numbers; 0, 90, 180 or 270.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

Scale(Double)

A utility method used to scale physical dimensions of the page including all page content.

Declaration

public void Scale(double sc)

Parameters

Type	Name	Description
System.Double	sc	A number greater than 0 which is used as a scale factor. For example, calling page.Scale(0.5) will reduce physical dimensions of the page to half its original size, whereas page.Scale(2) will double the physical dimensions of the page and will rescale all page content appropriately.

Remarks

Unlike SetUserUnitSize(unit_size) which is only supported in PDF 1.6 (i.e. Acrobat 7) and above, page.Scale(sc) supports all PDF versions.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

Set(Page)

Sets the page to given Page object

Declaration

public void Set(Page p)

Parameters

Type	Name	Description
Page	p	a given Page object

SetBox(Page.Box, Rect)

Sets the specified box

Declaration

public void SetBox(Page.Box type, Rect box)

Parameters

Type	Name	Description
Page.Box	type	The type of the page bounding box. Possible values are: e_media, e_crop, e_bleed, e_trim, and e_art.
Rect	box	A rectangle specifying the coordinates to set for the box. The coordinates are specified in user space units.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

SetCropBox(Rect)

Sets the crop box for this page. The crop box is the region of the page to display and print.

Declaration

public void SetCropBox(Rect box)

Parameters

Type	Name	Description
Rect	box	the new crop box for this page. The page dimensions are specified in user space coordinates. The crop box defines the region to which the contents of the page are to be clipped (cropped) when displayed or printed.

Remarks

this method is equivalent to SetBox(Page::e_crop)

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

SetMediaBox(Rect)

Sets the media box for this page.

Declaration

public void SetMediaBox(Rect box)

Parameters

Type	Name	Description
Rect	box	the new media box for this page. The page dimensions are specified in user space coordinates. The media box defines the boundaries of the physical medium on which the page is to be printed. It may include any extended area surrounding the finished page for bleed, printing marks, or other such purposes.

Remarks

this method is equivalent to SetBox(Page::e_media)

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

SetRotation(Page.Rotate)

Sets the rotation value for this page.

Declaration

public void SetRotation(Page.Rotate angle)

Parameters

Type	Name	Description
Page.Rotate	angle	the new rotation

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

SetUserUnitSize(Double)

Sets the UserUnit value for a page.

Declaration

public void SetUserUnitSize(double unit_size)

Parameters

Type	Name	Description
System.Double	unit_size	A positive number giving the size of default user space units, in multiples of 1/72 inch.

Remarks

This is a PDF 1.6 feature. See the implementation note 171 in PDF Reference for details.

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception

SubtractRotations(Page.Rotate, Page.Rotate)

Rotate r0 counter clockwise by r1.

Declaration

public static Page.Rotate SubtractRotations(Page.Rotate r0, Page.Rotate r1)

Parameters

Type	Name	Description
Page.Rotate	r0	r0 first rotation.
Page.Rotate	r1	r1 second rotation.

Returns

Type	Description
Page.Rotate	returns r0 - r1

Exceptions

Type	Condition
PDFNetException	PDFNetException the PDFNet exception