class HexaPDF:: Document:: Layout
Parent | Object |
---|
This class provides methods for working with classes in the HexaPDF::Layout
module.
Often times the layout related classes are used through HexaPDF::Composer
which makes it easy to create documents. However, sometimes one wants to have a bit more control or do something special and use the HexaPDF::Layout
classes directly. This is possible but it is better to use those classes through an instance of this classs because it makes it more convenient and ties everything together. Incidentally, HexaPDF::Composer
relies on this class for a good part of its work.
Boxes¶ ↑
The main focus of the class is on providing convenience methods for creating box objects. The most often used box classes like HexaPDF::Layout::TextBox
or HexaPDF::Layout::ImagebBox can be created through dedicated methods.
Other, more general boxes don't have their own method but can be created through the general box
method.
Box Styles¶ ↑
All box creation methods accept HexaPDF::Layout::Style
objects or names for style objects (defined via style
). This allows one to predefine certain styles (like first level heading, second level heading, paragraph, …) and consistently use them throughout the document creation process.
One style property, HexaPDF::Layout::Style#font
, is handled specially:
-
If no font is set on a style, the font “Times” is automatically set because otherwise there would be problems with text drawing operations (font is the only style property that has no valid default value).
-
Standard style objects only allow font wrapper objects to be set via the
HexaPDF::Layout::Style#font
method. This class makes usage easier by allowing strings or an array [name, options_hash] to be used, like with e.gContent::Canvas#font
. So to use Helvetica as font, one could just do:style.font = 'Helvetica'
And if Helvetica in its bold variant should be used it would be:
style.font = ['Helvetica', variant: :bold]
Attributes
The mapping of style name (a Symbol) to HexaPDF::Layout::Style
instance.
Public Class Methods
Public Instance Methods
Creates the named box and returns it.
The name
argument refers to the registered name of the box class that is looked up in the 'layout.boxes.map' configuration option. The box_options
are passed as-is to the initialization method of that box class
If a block is provided, a ChildrenCollector
is yielded and the collected children are passed to the box initialization method via the :children keyword argument.
See text_box
for details on width
, height
and style
(note that there is no style_properties
argument).
Example:
doc.layout.box(:column, columns: 2, gap: 15) # => column_box_instance doc.layout.box(:column) do |column| # column box with one child column.lorem_ipsum end
Creates a HexaPDF::Layout::TextBox
like text_box
but allows parts of the text to be formatted differently.
The argument data
needs to be an array of String and/or Hash objects:
-
A String object is treated like {text: data}.
-
Hashes can contain any style properties and the following special keys:
- text
-
The text to be formatted.
- link
-
A URL that should be linked to. If no text is provided but a link, the link is used as text.
- style
-
The style to be use as base style instead of the style created from the
style
andstyle_properties
arguments. SeeHexaPDF::Layout::Style::create
for allowed values.
If any style properties are set, the used style is duplicated and the additional properties applied.
See text_box
for details on width
, height
, style
, style_properties
, properties
and box_style
.
Examples:
layout.formatted_text_box(["Some string"]) layout.formatted_text_box(["Some ", {text: "string", fill_color: 128}]) layout.formatted_text_box(["Some ", {link: "https://example.com", fill_color: 'blue', text: "Example"}]) layout.formatted_text_box(["Some ", {text: "string", style: {font_size: 20}}])
See: text_box
, HexaPDF::Layout::TextBox
, HexaPDF::Layout::TextFragment
Creates a HexaPDF::Layout::ImageBox
for the given image.
The file
argument can be anything that is accepted by HexaPDF::Document::Images#add
or a HexaPDF::Type::Form
object.
See text_box
for details on width
, height
, style
, style_properties
and properties
.
Examples:
layout.image_box(machu_picchu, border: {width: 3}) layout.image_box(machu_picchu, height: 30)
Creates or updates the HexaPDF::Layout::Style
object called name
with the given property values and returns it.
This method allows convenient access to the stored styles and to update them. Such styles can then be used by name in the various box creation methods, e.g. text_box
or image_box
.
If neither base
nor any style properties are specified, the style name
is just returned.
If the style name
does not exist yet and the argument base
specifies the name of another style, that style is duplicated and used as basis for the style. This also means that the referenced base
style needs be defined first!
The special name :base should be used for setting the base style which is used when no specific style is set.
Note that the style property 'font' is handled specially, see the class documentation for details.
Example:
layout.style(:base, font_size: 12, leading: 1.2) layout.style(:header, font: 'Helvetica', fill_color: "008") layout.style(:header1, base: :header, font_size: 30)
Creates a HexaPDF::Layout::TextBox
for the given text.
This method is of the two main methods for creating text boxes, the other being formatted_text_box
.
width
,height
-
The arguments
width
andheight
are used as constraints and are respected when fitting the box. The default value of 0 means that no constraints are set. style
,style_properties
-
The box and the text are styled using the given
style
. This can either be a style name set viastyle
or anythingHexaPDF::Layout::Style::create
accepts. If any additionalstyle_properties
are specified, the style is duplicated and the additional styles are applied. properties
-
This can be used to set custom properties on the created text box. See Box#properties for details and usage.
box_style
-
Sometimes it is necessary for the box to have a different style than the text, e.g. when using overlays. In such a case use
box_style
for specifiying the style of the box (a style name set viastyle
or anythingHexaPDF::Layout::Style::create
accepts).The
style
together with thestyle_properties
will be used for the text style.
Examples:
layout.text("Test " * 15) layout.text("Now " * 7, width: 100) layout.text("Another test", font_size: 15, fill_color: "green") layout.text("Different box style", fill_color: 'white', box_style: { underlays: [->(c, b) { c.rectangle(0, 0, b.content_width, b.content_height).fill }] })
See: formatted_text_box
, HexaPDF::Layout::TextBox
, HexaPDF::Layout::TextFragment