Class DimensionHandle
Note that this handle cannot translate a dimension property into a physical dimension. BIRT uses the CSS dimension system and requires a CSS User Agent (UA) to compute the physical layout of a report given a report design. These calculations often require context (to compute relative dimensions) and knowledge of item contents to compute the sizes of items that expand to fit their content.
This handle works with individual dimensions, the application-provided UA uses these properties (and information about the overall report design) to produce physical, absolute dimensions.
The application generally does not create dimension handles directly. It uses
the method in DesignElementHandle
to get a dimension handle. For
example:
DesignElementHandle elementHandle = element.handle( ); <p> DimensionHandle dimensionHandle = elementHandle .getDimensionProperty( Style.FONT_SIZE_PROP );
The value of the dimension can be a standard format such as 1pt, 100% etc.
This kind of value represents a standard dimension, or it can be a CSS
(predefined) value such as XX-SMALL, X-SMALL. The CSS values are defined in
DesignChoiceConstants
.
- See Also:
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Field Summary
Fields inherited from class org.eclipse.birt.report.model.api.ComplexValueHandle
memberContext, propDefn
Fields inherited from class org.eclipse.birt.report.model.api.ElementDetailHandle
elementHandle
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Constructor Summary
ConstructorsConstructorDescriptionDimensionHandle
(DesignElementHandle element, org.eclipse.birt.report.model.core.MemberRef context) Deprecated.DimensionHandle
(DesignElementHandle element, org.eclipse.birt.report.model.core.StructureContext context) Constructs a dimension handle for a member of a structure.DimensionHandle
(DesignElementHandle element, org.eclipse.birt.report.model.metadata.ElementPropertyDefn thePropDefn) Constructs a dimension handle for a element property. -
Method Summary
Modifier and TypeMethodDescriptionReturns the absolute dimension value with the following units.IChoice[]
Returns an array of allowed units.Gets the default unit of the property.double
Returns the numeric measure part of the dimension.getUnits()
Returns the code for the units portion of the dimension.boolean
Determines if the dimension is given by a standard format or by a pre-defined constant.void
setAbsolute
(double value) Sets the value of a dimension in default units.Methods inherited from class org.eclipse.birt.report.model.api.ComplexValueHandle
getContext, getDefn, getDisplayValue, getPropertyDefn, getRawValue, getStringValue, getValue, isSet, setStringValue, setValue
Methods inherited from class org.eclipse.birt.report.model.api.ValueHandle
getReference
Methods inherited from class org.eclipse.birt.report.model.api.ElementDetailHandle
getDesign, getElement, getElementHandle, getModule
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Constructor Details
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DimensionHandle
public DimensionHandle(DesignElementHandle element, org.eclipse.birt.report.model.core.StructureContext context) Constructs a dimension handle for a member of a structure. This member must be a dimension type.- Parameters:
element
- the design element handlecontext
- the context for the member property
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DimensionHandle
@Deprecated public DimensionHandle(DesignElementHandle element, org.eclipse.birt.report.model.core.MemberRef context) Deprecated.Constructs a dimension handle for a member of a structure. This member must be a dimension type.- Parameters:
element
- the design element handlecontext
- the context for the member property
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DimensionHandle
public DimensionHandle(DesignElementHandle element, org.eclipse.birt.report.model.metadata.ElementPropertyDefn thePropDefn) Constructs a dimension handle for a element property. This property must be a dimension type.- Parameters:
element
- handle to the element that defined the property.thePropDefn
- definition of the dimension property.
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Method Details
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isKeyword
public boolean isKeyword()Determines if the dimension is given by a standard format or by a pre-defined constant.- Returns:
true
if the dimension is given by an pre-defined constantfalse
if the dimension is given by a standard dimension.
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getMeasure
public double getMeasure()Returns the numeric measure part of the dimension. For example, if the dimension value is "2.3cm", the measure is 2.3.- Returns:
- the numeric measure of the dimension, return
0.0
if the dimension from an choice.
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getAllowedUnits
Returns an array of allowed units. The set of allowed units depends on context, not all properties allow all units.- Returns:
- an array of allowed unit suffixes. Each suffix is a string.
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getUnits
Returns the code for the units portion of the dimension. For example, if the dimension value is "2.3cm", then the unit is "cm".- Returns:
- the units portion of the dimension. Return
DimensionValue.DEFAULT_UNIT
if the dimension is a predefined constant.
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setAbsolute
Sets the value of a dimension in default units. The default unit may be defined by the property in BIRT or the application unit defined in the design session.- Parameters:
value
- the new value in application units.- Throws:
SemanticException
- if the property is locked
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getAbsoluteValue
Returns the absolute dimension value with the following units.- UNITS_IN
- UNITS_CM
- UNITS_MM
- UNITS_PT
- UNITS_PC
- UNITS_PX
IAbsoluteFontSizeValueProvider
. Only the value of CSS property of the element which is not style is handled here.null
is returned if this dimension is not CSS style property.CSS 2.1 specification has the following statements:
Child elements do not inherit the relative values specified for their parent; they inherit the computed values.
Example(s):
In the following rules, the computed 'text-indent' value of "h1" elements will be 36px, not 45px, if "h1" is a child of the "body" element.
body { font-size: 12px; text-indent: 3em; /* i.e., 36px}}
h1 { font-size: 15px }
So when computing the value of text-indent, with this method, the value of font-size is retrieved from body, instead of h1.
- Returns:
- the absolute dimension value.
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getDefaultUnit
Gets the default unit of the property.- Returns:
- the default unit
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