com.smartgwt.client.widgets.form.fields

Class CanvasItem

java.lang.Object

com.smartgwt.client.core.JsObject

com.smartgwt.client.core.DataClass

com.smartgwt.client.core.RefDataClass

com.smartgwt.client.widgets.form.fields.FormItem

com.smartgwt.client.widgets.form.fields.CanvasItem

All Implemented Interfaces:

com.google.gwt.event.shared.HasHandlers, HasBlurHandlers, HasCanEditChangedHandlers, HasChangedHandlers, HasChangeHandlers, HasClickHandlers, HasDoubleClickHandlers, HasEditorEnterHandlers, HasEditorExitHandlers, HasFocusHandlers, HasIconClickHandlers, HasIconKeyPressHandlers, HasItemHoverHandlers, HasKeyDownHandlers, HasKeyPressHandlers, HasKeyUpHandlers, HasPickerIconClickHandlers, HasShowValueHandlers, HasTitleClickHandlers, HasTitleDoubleClickHandlers, HasTitleHoverHandlers, HasValueHoverHandlers

Direct Known Subclasses:

ButtonItem, DateRangeItem, FileItem, MultiComboBoxItem, MultiFileItem, PickTreeItem, RelativeDateItem, RichTextItem, SectionItem, SliderItem, ToolbarItem, ViewFileItem

public class CanvasItem
extends FormItem
implements HasCanEditChangedHandlers, HasShowValueHandlers

FormItem which renders a Canvas inline in a DynamicForm instance.

CanvasItem is shouldSaveValue:false by default, meaning that no value from the CanvasItem will be present in values and no value will be saved when DynamicForm.saveData is called. This is appropriate if your Canvas does not participate in displaying or editing the values of the form and is embedded in the form for layout purposes only.

If you set shouldSaveValue:true, CanvasItem.showValue will be called to provide a value that your item should display. Implement showValue() and call methods on the Canvas you've created to cause the value to be displayed.

showValue() will be called in various situations where the form receives data, including a call to DynamicForm.setValues, DynamicForm.editRecord, or if DynamicForm.fetchData is called and a Record is returned. Bear in mind that showValue() can be called when the form and your item have not yet been drawn; in this case, store the value for later display.

To provide a value to the form, call CanvasItem.storeValue whenever the user changes the value in your Canvas. Note that the form will not call canvasItem.getValue() in order to discover your item's value, so there is no purpose in overriding this method - use storeValue to proactively inform the form about changes instead. This approach is necessary in order to enable change events.

If you cannot easily detect changes to values in your Canvas, a workaround is to call storeValue right before the form saves.

Field Summary

Fields inherited from class com.smartgwt.client.core.RefDataClass

id

Fields inherited from class com.smartgwt.client.core.JsObject

jsObj

Constructor Summary

Constructors

Constructor and Description
CanvasItem()
CanvasItem(com.google.gwt.core.client.JavaScriptObject jsObj)
CanvasItem(java.lang.String name)
CanvasItem(java.lang.String name, java.lang.String title)

Method Summary

Methods

Modifier and Type	Method and Description
com.google.gwt.event.shared.HandlerRegistration	addCanEditChangedHandler(CanEditChangedHandler handler) Add a canEditChanged handler.
com.google.gwt.event.shared.HandlerRegistration	addShowValueHandler(ShowValueHandler handler) Add a showValue handler.
static void	changeAutoChildDefaults(java.lang.String autoChildName, Canvas defaults) Changes the defaults for Canvas AutoChildren named autoChildName.
static void	changeAutoChildDefaults(java.lang.String autoChildName, FormItem defaults) Changes the defaults for FormItem AutoChildren named autoChildName.
static void	changePickerIconDefaults(FormItemIcon defaults)
protected Canvas	createCanvas() This method is called to dynamically create a canvas for this CanvasItem.
java.lang.Boolean	getApplyPromptToCanvas() If prompt is specified for this item, should the prompt be applied to the canvas for this item?
java.lang.Boolean	getAutoDestroy() Should this item's canvas be automatically destroyed when the item is destroyed? Form items are destroyed automatically when a call to DynamicForm.setItems removes them from their parent form, or if their parent form is destroyed.
Canvas	getCanvas() The canvas that will be displayed inside this item.
java.lang.Boolean	getEditCriteriaInInnerForm() Flag to disable the criteria editing overrides described in setCriterionGetter() whereby if this item contains a DynamicForm as its canvas, it will be used to edit nested AdvancedCriteria automatically.
int	getHeight() Height of the Canvas.
java.lang.Boolean	getMultiple() Whether this CanvasItem is intended to hold multiple values.
static CanvasItem	getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)
Overflow	getOverflow() CanvasItems support specifying overflow for the Canvas directly on the item.
java.lang.String	getPrompt() This text is shown as a tooltip prompt when the cursor hovers over this item.
java.lang.Boolean	getShouldSaveValue() Should this item's value be saved in the form's values and hence returned from form.getValues()?
java.lang.Boolean	hasAdvancedCriteria() Overridden to return true if canvas is a dynamicForm.
void	readOnlyDisplayChanged(ReadOnlyDisplayAppearance readOnlyDisplay) Notification method called when readOnlyDisplay is modified.
void	setApplyPromptToCanvas(java.lang.Boolean applyPromptToCanvas) If prompt is specified for this item, should the prompt be applied to the canvas for this item?
void	setAutoDestroy(java.lang.Boolean autoDestroy) Should this item's canvas be automatically destroyed when the item is destroyed? Form items are destroyed automatically when a call to DynamicForm.setItems removes them from their parent form, or if their parent form is destroyed.
void	setCanEditCriterionPredicate(FormItemCanEditCriterionPredicate predicate) AdvancedCriteria objects may be edited via nested dynamicForms as described in CanvasItem.setCriterionGetter.
void	setCanvas(Canvas canvas) The canvas that will be displayed inside this item.
void	setCriterionGetter(FormItemCriterionGetter getter) The standard formItem criteria editing APIs have been overridden in the canvasItem class to simplify the editing of complex AdvancedCriteria objects using nested DynamicForms.
void	setCriterionSetter(FormItemCriterionSetter setter) Provide a setCriterion() implementation to display a Criterion object in this item for editing.
static void	setDefaultProperties(CanvasItem canvasItemProperties) Class level method to set the default properties of this class.
void	setEditCriteriaInInnerForm(java.lang.Boolean editCriteriaInInnerForm) Flag to disable the criteria editing overrides described in setCriterionGetter() whereby if this item contains a DynamicForm as its canvas, it will be used to edit nested AdvancedCriteria automatically.
void	setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)
void	setMultiple(java.lang.Boolean multiple) Whether this CanvasItem is intended to hold multiple values.
void	setOverflow(Overflow overflow) CanvasItems support specifying overflow for the Canvas directly on the item.
void	setPrompt(java.lang.String prompt) This text is shown as a tooltip prompt when the cursor hovers over this item.
void	setShouldSaveValue(java.lang.Boolean shouldSaveValue) Should this item's value be saved in the form's values and hence returned from form.getValues()?
protected void	setupCanvasConstructor()
void	storeValue(java.lang.Object value) Store a value for this form item.
void	storeValue(Record value) Store a value for this form item.
void	storeValue(RecordList value) Store a value for this form item.

Methods inherited from class com.smartgwt.client.widgets.form.fields.FormItem

_getValue, addBlurHandler, addChangedHandler, addChangeHandler, addClickHandler, addDoubleClickHandler, addEditorEnterHandler, addEditorExitHandler, addFocusHandler, addIconClickHandler, addIconKeyPressHandler, addItemHoverHandler, addKeyDownHandler, addKeyPressHandler, addKeyUpHandler, addPickerIconClickHandler, addTitleClickHandler, addTitleDoubleClickHandler, addTitleHoverHandler, addValueHoverHandler, asSGWTComponent, blurItem, canEditCriterion, clearValue, disable, enable, focusInItem, getAccessKey, getAlign, getAllowExpressions, getAlwaysFetchMissingValues, getApplyHeightToTextBox, getAriaRole, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsString, getBrowserSpellCheck, getCanEdit, getCanFocus, getCanvasAutoChild, getCellHeight, getCellStyle, getClassName, getClipStaticValue, getClipTitle, getConfig, getContainerWidget, getCriteriaField, getCriterion, getCriterion, getDataPath, getDateFormatter, getDecimalPad, getDecimalPrecision, getDefaultIconSrc, getDisabled, getDisableIconsOnReadOnly, getDisplayField, getDisplayFieldName, getDisplayValue, getDisplayValue, getEditorTypeConfig, getEditPendingCSSText, getEmptyDisplayValue, getEmptyValueIcon, getEndRow, getErrorIconHeight, getErrorIconSrc, getErrorIconWidth, getErrorMessageWidth, getFetchMissingValues, getFieldName, getFilterLocally, getForm, getFormItemAutoChild, getFullDataPath, getGlobalTabIndex, getHint, getHintStyle, getHoverAlign, getHoverDelay, getHoverHeight, getHoverOpacity, getHoverStyle, getHoverVAlign, getHoverWidth, getIcon, getIconHeight, getIconHSpace, getIconPageRect, getIconPrompt, getIconRect, getIconVAlign, getIconWidth, getImageURLPrefix, getImageURLSuffix, getImplicitSave, getImplicitSaveOnBlur, getInputFormat, getLeft, getLocateItemBy, getMultipleValueSeparator, getName, getOperator, getOptionCriteria, getOptionFilterContext, getOptionOperationId, getPageLeft, getPageRect, getPageTop, getPicker, getPickerIconHeight, getPickerIconName, getPickerIconPrompt, getPickerIconProperties, getPickerIconSrc, getPickerIconStyle, getPickerIconWidth, getPrintTextBoxStyle, getPrintTitleStyle, getReadOnlyDisplay, getReadOnlyTextBoxStyle, getRect, getRedrawOnChange, getRejectInvalidValueOnChange, getRequired, getRequiredMessage, getRowSpan, getSaveOnEnter, getSelectedRecord, getSelectOnClick, getSelectOnFocus, getShowClippedTitleOnHover, getShowClippedValueOnHover, getShowDisabled, getShowErrorIcon, getShowErrorStyle, getShowErrorText, getShowFocused, getShowFocusedErrorState, getShowFocusedIcons, getShowFocusedPickerIcon, getShowHint, getShowIcons, getShowOverIcons, getShowPickerIcon, getShowRTL, getShowTitle, getShowValueIconOnly, getStartRow, getStopOnError, getSuppressValueIcon, getSynchronousValidation, getTabIndex, getTextAlign, getTextBoxStyle, getTimeFormatter, getTitle, getTitleAlign, getTitleColSpan, getTitleOrientation, getTitleStyle, getTitleVAlign, getTooltip, getTop, getType, getValidateOnChange, getValidateOnExit, getValidOperators, getVAlign, getValue, getValueAsRecordList, getValueField, getValueFieldName, getValueIconHeight, getValueIconLeftPadding, getValueIconRightPadding, getValueIconSize, getValueIconWidth, getVisible, getVisibleHeight, getVisibleWidth, getWidth, getWrapTitle, hide, hideIcon, invalidateDisplayValueCache, isCreated, isDisabled, isDrawn, isVisible, redraw, setAccessKey, setAlign, setAllowExpressions, setAlwaysFetchMissingValues, setApplyHeightToTextBox, setAriaRole, setAriaState, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAutoChildConstructor, setAutoChildProperties, setAutoChildProperties, setAutoChildVisibility, setBrowserSpellCheck, setCanEdit, setCanFocus, setCellHeight, setCellStyle, setClipStaticValue, setClipTitle, setColSpan, setColSpan, setCriteriaField, setCriterion, setDataPath, setDateFormatter, setDecimalPad, setDecimalPrecision, setDefaultIconSrc, setDefaultProperties, setDefaultValue, setDefaultValue, setDefaultValue, setDefaultValue, setDefaultValue, setDefaultValue, setDefaultValue, setDisabled, setDisableIconsOnReadOnly, setDisplayField, setDisplayFormat, setDisplayFormat, setEditorProperties, setEditorType, setEditorType, setEditorType, setEditorValueFormatter, setEditorValueParser, setEditPendingCSSText, setEmptyDisplayValue, setEmptyValueIcon, setEndRow, setErrorFormatter, setErrorIconHeight, setErrorIconSrc, setErrorIconWidth, setErrorMessageWidth, setErrorOrientation, setFetchMissingValues, setFilterLocally, setGlobalTabIndex, setHeight, setHeight, setHint, setHintStyle, setHoverAlign, setHoverDelay, setHoverHeight, setHoverOpacity, setHoverStyle, setHoverVAlign, setHoverWidth, setIconHeight, setIconHSpace, setIconPrompt, setIcons, setIconVAlign, setIconWidth, setImageURLPrefix, setImageURLSuffix, setImplicitSave, setImplicitSaveOnBlur, setInitHandler, setInputFormat, setInputTransformer, setItemHoverFormatter, setItemTitleHoverFormatter, setItemValueHoverFormatter, setLeft, setLocateItemBy, setMultipleValueSeparator, setName, setOperator, setOptionCriteria, setOptionDataSource, setOptionFilterContext, setOptionOperationId, setPickerIconHeight, setPickerIconName, setPickerIconPrompt, setPickerIconProperties, setPickerIconSrc, setPickerIconStyle, setPickerIconWidth, setPrintTextBoxStyle, setPrintTitleStyle, setProperty, setProperty, setProperty, setProperty, setProperty, setReadOnlyDisplay, setReadOnlyTextBoxStyle, setRedrawOnChange, setRejectInvalidValueOnChange, setRequired, setRequiredMessage, setRowSpan, setSaveOnEnter, setSelectOnClick, setSelectOnFocus, setShowClippedTitleOnHover, setShowClippedValueOnHover, setShowDisabled, setShowErrorIcon, setShowErrorStyle, setShowErrorText, setShowFocused, setShowFocusedErrorState, setShowFocusedIcons, setShowFocusedPickerIcon, setShowHint, setShowIcons, setShowIfCondition, setShowOverIcons, setShowPickerIcon, setShowRTL, setShowTitle, setShowValueIconOnly, setStartRow, setStopOnError, setSuppressValueIcon, setSynchronousValidation, setTabIndex, setTextAlign, setTextBoxStyle, setTimeFormatter, setTitle, setTitleAlign, setTitleColSpan, setTitleHoverFormatter, setTitleOrientation, setTitleStyle, setTitleVAlign, setTooltip, setTop, setType, setValidateOnChange, setValidateOnExit, setValidators, setValidOperators, setVAlign, setValue, setValue, setValue, setValue, setValue, setValue, setValueField, setValueFormatter, setValueHoverFormatter, setValueIconHeight, setValueIconLeftPadding, setValueIconMapper, setValueIconRightPadding, setValueIcons, setValueIconSize, setValueIconWidth, setValueMap, setValueMap, setVisible, setWidth, setWidth, setWrapTitle, shouldApplyHeightToTextBox, shouldFetchMissingValue, shouldSaveOnEnter, show, showIcon, showPicker, stopHover, updateState, validate, valueClipped

Methods inherited from class com.smartgwt.client.core.RefDataClass

getRef, getRef, internalSetID

Methods inherited from class com.smartgwt.client.core.DataClass

doAddHandler, fireEvent, getAttributeAsDoubleArray, getAttributeAsIntArray, getAttributeAsLong, getAttributeAsMap, getAttributeAsObject, getAttributeAsRecord, getAttributeAsStringArray, getAttributes, getHandlerCount, getJsObj, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttributeAsJavaObject

Methods inherited from class com.smartgwt.client.core.JsObject

equals, hashCode, setJsObj

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.gwt.event.shared.HasHandlers

fireEvent

Constructor Detail

CanvasItem

public CanvasItem()

CanvasItem

public CanvasItem(com.google.gwt.core.client.JavaScriptObject jsObj)

CanvasItem

public CanvasItem(java.lang.String name)

CanvasItem

public CanvasItem(java.lang.String name,
          java.lang.String title)

Method Detail

getOrCreateRef

public static CanvasItem getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)

setJavaScriptObject

public void setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)

Overrides:

setJavaScriptObject in class FormItem

changeAutoChildDefaults

public static void changeAutoChildDefaults(java.lang.String autoChildName,
                           Canvas defaults)

Changes the defaults for Canvas AutoChildren named autoChildName.

Parameters:

autoChildName - name of an AutoChild to customize the defaults for.

defaults - Canvas defaults to apply. These defaults override any existing properties without destroying or wiping out non-overridden properties.

See Also:

AutoChildUsage

changeAutoChildDefaults

public static void changeAutoChildDefaults(java.lang.String autoChildName,
                           FormItem defaults)

Changes the defaults for FormItem AutoChildren named autoChildName.

Parameters:

autoChildName - name of an AutoChild to customize the defaults for.

defaults - FormItem defaults to apply. These defaults override any existing properties without destroying or wiping out non-overridden properties.

See Also:

AutoChildUsage

changePickerIconDefaults

public static void changePickerIconDefaults(FormItemIcon defaults)

setApplyPromptToCanvas

public void setApplyPromptToCanvas(java.lang.Boolean applyPromptToCanvas)

If prompt is specified for this item, should the prompt be applied to the canvas for this item?

Parameters:

applyPromptToCanvas - applyPromptToCanvas Default value is true

getApplyPromptToCanvas

public java.lang.Boolean getApplyPromptToCanvas()

If prompt is specified for this item, should the prompt be applied to the canvas for this item?

Returns:

Boolean

setAutoDestroy

public void setAutoDestroy(java.lang.Boolean autoDestroy)

Should this item's canvas be automatically destroyed when the item is destroyed? Form items are destroyed automatically when a call to DynamicForm.setItems removes them from their parent form, or if their parent form is destroyed. This property governs whether, when this occurs, the item's canvas should also be destroyed.

Setting this property to true is typically appropriate for cases where a custom CanvasItem automatically creates its canvas as part of its initialization flow. Note that once a canvas has been destroyed it can not be re-used elsewhere within an application.

Note : This is an advanced setting

Parameters:

autoDestroy - autoDestroy Default value is false

getAutoDestroy

public java.lang.Boolean getAutoDestroy()

Should this item's canvas be automatically destroyed when the item is destroyed? Form items are destroyed automatically when a call to DynamicForm.setItems removes them from their parent form, or if their parent form is destroyed. This property governs whether, when this occurs, the item's canvas should also be destroyed.

Setting this property to true is typically appropriate for cases where a custom CanvasItem automatically creates its canvas as part of its initialization flow. Note that once a canvas has been destroyed it can not be re-used elsewhere within an application.

Returns:

Boolean

setCanvas

public void setCanvas(Canvas canvas)

The canvas that will be displayed inside this item. You can pass an instance you've already created, or its global ID as a String. You can also implement CanvasItem.createCanvas to dynamically create the canvas when the FormItem is initialized.

If canvas and createCanvas() are unspecified, the canvas for this item will be auto-created using the overrideable defaults: canvasProperties and canvasConstructor

Note that canvasItem will be set on the canvas to point back to this item.

If this method is called after the component has been drawn/initialized: Setter to update the canvas at runtime

Parameters:

canvas - New canvas to display.. Default value is null

getCanvas

public Canvas getCanvas()

The canvas that will be displayed inside this item. You can pass an instance you've already created, or its global ID as a String. You can also implement CanvasItem.createCanvas to dynamically create the canvas when the FormItem is initialized.

If canvas and createCanvas() are unspecified, the canvas for this item will be auto-created using the overrideable defaults: canvasProperties and canvasConstructor

Note that canvasItem will be set on the canvas to point back to this item.

Returns:

Canvas

setEditCriteriaInInnerForm

public void setEditCriteriaInInnerForm(java.lang.Boolean editCriteriaInInnerForm)

Flag to disable the criteria editing overrides described in setCriterionGetter() whereby if this item contains a DynamicForm as its canvas, it will be used to edit nested AdvancedCriteria automatically.

This flag is required for cases where a canvasItem contains a DynamicForm, but the form is not set up to show inner field values of nested objects, and therefore should not attempt to apply nested advanced criteria directly to the form.

Note : This is an advanced setting

Parameters:

editCriteriaInInnerForm - editCriteriaInInnerForm Default value is true

getEditCriteriaInInnerForm

public java.lang.Boolean getEditCriteriaInInnerForm()

Flag to disable the criteria editing overrides described in setCriterionGetter() whereby if this item contains a DynamicForm as its canvas, it will be used to edit nested AdvancedCriteria automatically.

This flag is required for cases where a canvasItem contains a DynamicForm, but the form is not set up to show inner field values of nested objects, and therefore should not attempt to apply nested advanced criteria directly to the form.

Returns:

Boolean

setMultiple

public void setMultiple(java.lang.Boolean multiple)

Whether this CanvasItem is intended to hold multiple values.

This attribute can affect the return type of getValue(). If this CanvasItem is storing multiple values, then the return type of getValue() is JavaScriptObject (a JavaScript array object) if multiple is null or false. However, if multiple is true, then the return type is either List or RecordList.

Parameters:

multiple - multiple Default value is null

getMultiple

public java.lang.Boolean getMultiple()

Whether this CanvasItem is intended to hold multiple values.

This attribute can affect the return type of getValue(). If this CanvasItem is storing multiple values, then the return type of getValue() is JavaScriptObject (a JavaScript array object) if multiple is null or false. However, if multiple is true, then the return type is either List or RecordList.

Returns:

Boolean

setOverflow

public void setOverflow(Overflow overflow)

CanvasItems support specifying overflow for the Canvas directly on the item.

Parameters:

overflow - overflow Default value is null

getOverflow

public Overflow getOverflow()

CanvasItems support specifying overflow for the Canvas directly on the item.

Returns:

Overflow

setPrompt

public void setPrompt(java.lang.String prompt)

This text is shown as a tooltip prompt when the cursor hovers over this item.

If this method is called after the component has been drawn/initialized: Set the prompt for this item. Default implementation will also apply the prompt to canvas if applyPromptToCanvas is true.

Overrides:

setPrompt in class FormItem

Parameters:

prompt - new prompt for the item.. See String. Default value is null

See Also:

Basics overview and related methods

getPrompt

public java.lang.String getPrompt()

This text is shown as a tooltip prompt when the cursor hovers over this item.

Overrides:

getPrompt in class FormItem

Returns:

. See String

See Also:

Basics overview and related methods

setShouldSaveValue

public void setShouldSaveValue(java.lang.Boolean shouldSaveValue)

Should this item's value be saved in the form's values and hence returned from form.getValues()?

See the CanvasItem class overview for a discussion of values-handling in CanvasItems

Overrides:

setShouldSaveValue in class FormItem

Parameters:

shouldSaveValue - shouldSaveValue Default value is false

getShouldSaveValue

public java.lang.Boolean getShouldSaveValue()

Should this item's value be saved in the form's values and hence returned from form.getValues()?

See the CanvasItem class overview for a discussion of values-handling in CanvasItems

Overrides:

getShouldSaveValue in class FormItem

Returns:

Boolean

addCanEditChangedHandler

public com.google.gwt.event.shared.HandlerRegistration addCanEditChangedHandler(CanEditChangedHandler handler)

Add a canEditChanged handler.

Notification method called when canEdit is modified. Developers may make use of this to toggle between an editable and a read-only appearance for custom FormItems.

Specified by:

addCanEditChangedHandler in interface HasCanEditChangedHandlers

Parameters:

handler - the canEditChanged handler

Returns:

HandlerRegistration used to remove this handler

hasAdvancedCriteria

public java.lang.Boolean hasAdvancedCriteria()

Overridden to return true if canvas is a dynamicForm. See setCriterionGetter() for details of editing advanced criteria using nested dynamicForms.

Overrides:

hasAdvancedCriteria in class FormItem

Returns:

true if this item's canvas is a DynamicForm

See Also:

CriteriaEditing overview and related methods

readOnlyDisplayChanged

public void readOnlyDisplayChanged(ReadOnlyDisplayAppearance readOnlyDisplay)

Notification method called when readOnlyDisplay is modified. Developers may make use of this to alter the read-only appearance of custom FormItems.

Parameters:

readOnlyDisplay - New readOnlyDisplay value

addShowValueHandler

public com.google.gwt.event.shared.HandlerRegistration addShowValueHandler(ShowValueHandler handler)

Add a showValue handler.

This method will be called whenever this form item's value is being set via a programmatic call to e.g: DynamicForm.setValues or FormItem.setValue and may be overridden by CanvasItems intended to support displaying data values to update the embedded Canvas to reflect the value passed in.

Specified by:

addShowValueHandler in interface HasShowValueHandlers

Parameters:

handler - the showValue handler

Returns:

HandlerRegistration used to remove this handler

setDefaultProperties

public static void setDefaultProperties(CanvasItem canvasItemProperties)

Class level method to set the default properties of this class. If set, then all subsequent instances of this class will automatically have the default properties that were set when this method was called. This is a powerful feature that eliminates the need for users to create a separate hierarchy of subclasses that only alter the default properties of this class. Can also be used for skinning / styling purposes.

Note: This method is intended for setting default attributes only and will effect all instances of the underlying class (including those automatically generated in JavaScript). This method should not be used to apply standard EventHandlers or override methods for a class - use a custom subclass instead.

Parameters:

canvasItemProperties - properties that should be used as new defaults when instances of this class are created

getHeight

public int getHeight()

Height of the Canvas. Can be either a number indicating a fixed height in pixels, a percentage indicating a percentage of the overall form's height, or "*" indicating take whatever remaining space is available. See the FormLayout overview for details.

Height may also be explicitly specified on the canvas. In this any canvasItem.height will be ignored in favor of the value applied to the canvas directly. In either case, percentage values will be resolved using standard formItem sizing rules as described in FormLayout

Overrides:

getHeight in class FormItem

Returns:

Integer

See Also:

FormLayout overview and related methods, Filling Example

setupCanvasConstructor

protected void setupCanvasConstructor()

createCanvas

protected Canvas createCanvas()

This method is called to dynamically create a canvas for this CanvasItem. Overriding this method provides a mechanism to dynamically create the canvas rather than calling #setCanvas() directly.

Returns:

the canvas to be rendered inside this CanvasItem

storeValue

public void storeValue(java.lang.Object value)

Store a value for this form item. This method will fire standard FormItem.change and FormItem.changed handlers, and store out the method passed in such that subsequent calls to FormItem.getValue or DynamicForm.getValue will return the new value for this item.

For canvasItems that manipulate values and display them in some arbitrary canvas representation developers should call this method when the user interacts with the embedded canvas in a way that modifies the value for the item.

If you cannot easily detect changes to values in your Canvas, a workaround is to call storeValue right before the form saves.

Parameters:

value - value to save for this item

storeValue

public void storeValue(Record value)

Store a value for this form item. This method will fire standard FormItem.change and FormItem.changed handlers, and store out the method passed in such that subsequent calls to FormItem.getValue or DynamicForm.getValue will return the new value for this item.

For canvasItems that manipulate values and display them in some arbitrary canvas representation developers should call this method when the user interacts with the embedded canvas in a way that modifies the value for the item.

If you cannot easily detect changes to values in your Canvas, a workaround is to call storeValue right before the form saves.

Parameters:

value - value to save for this item

storeValue

public void storeValue(RecordList value)

Store a value for this form item. This method will fire standard FormItem.change and FormItem.changed handlers, and store out the method passed in such that subsequent calls to FormItem.getValue or DynamicForm.getValue will return the new value for this item.

For canvasItems that manipulate values and display them in some arbitrary canvas representation developers should call this method when the user interacts with the embedded canvas in a way that modifies the value for the item.

If you cannot easily detect changes to values in your Canvas, a workaround is to call storeValue right before the form saves.

Parameters:

value - value to save for this item

setCanEditCriterionPredicate

public void setCanEditCriterionPredicate(FormItemCanEditCriterionPredicate predicate)

AdvancedCriteria objects may be edited via nested dynamicForms as described in CanvasItem.setCriterionGetter.

The default canEditCriterion() predicate is overridden to return true if this item's canvas is a DynamicForm, where the operator matches the operator of the criterion passed in and dynamicForm contains items where the registered FormItemCanEditCriterionPredicate's canEditCriterion method returns true for each sub-criterion in the object passed in.

Overrides:

setCanEditCriterionPredicate in class FormItem

Parameters:

predicate - the predicate to determine the form items that can edit the criterion in question

See Also:

FormItem.setCanEditCriterionPredicate, CriteriaEditing overview and related methods

setCriterionGetter

public void setCriterionGetter(FormItemCriterionGetter getter)

The standard formItem criteria editing APIs have been overridden in the canvasItem class to simplify the editing of complex AdvancedCriteria objects using nested DynamicForms.

The following pattern is supported without need for further modification:
A complex Advanced criteria object may have nested sub criteria using the "and" or "or" operators. For example:

  { _constructor:"AdvancedCriteria",
    operator:"and",
    criteria:[
       {fieldName:"field1", value:"value1", operator:"iContains"},
       {operator:"or", criteria:[
           {fieldName:"innerField1", value:"value1", operator:"equals"},
           {fieldName:"innerField2", value:"value2", operator:"iContains"}
        ]
       }
    ]
  }
  

To create a form capable of editing the above criteria without providing a custom FormItemCriterionGetter et al, you would create a form with 2 items. The 'field1' criterion could be edited by a simple form item such as a TextItem. The nested criteria ('innerField1' and 'innerField2') could be edited by a canvasItem whose canvas property was set to a DynamicForm showing items capable of editing the 2 inner criteria, and whose operator was specified as "or".
For example:

   isc.DynamicForm.create({
       items:[
           {name:"field1", type:"TextItem"},
           {name:"nestedItem", shouldSaveValue:true, type:"CanvasItem",
               canvas:isc.DynamicForm.create({
                   operator:"or",
                   items:[
                       {name:"innerField1", type:"TextItem", operator:"equals"},
                       {name:"innerField2", type:"TextItem"}
                   ]
               })
           }
       ]
   });
   

This form would be able to edit the above advanced criteria object via DynamicForm.setValuesAsCriteria. Edited values would be retrieved via DynamicForm.getValuesAsCriteria.

Note that the canvas item has shouldSaveValue set to true - this is required to ensure the nested form is actually passed the values to edit.

The default implementation of this method checks for this.canvas being specified as a dynamicForm, and in that case simply returns the result of DynamicForm.getValuesAsAdvancedCriteria on the inner form.

Note that this functionality may be entirely bypassed by setting editCriteriaInInnerForm to false. This flag is useful when defining a dynamicForm based canvasItem which is not intended for editing nested data -- for example if a standard atomic field value is being displayed in some custom way using a DynamicForm embedded in the item.

Overrides:

setCriterionGetter in class FormItem

Parameters:

getter - provides a method to get a criterion object based on this field's current edited value(s).

See Also:

FormItem.setCriterionGetter(com.smartgwt.client.widgets.form.FormItemCriterionGetter), CriteriaEditing overview and related methods

setCriterionSetter

public void setCriterionSetter(FormItemCriterionSetter setter)

Provide a setCriterion() implementation to display a Criterion object in this item for editing. The default implementation is overridden from FormItem.setCriterionSetter in order to support editing nested criteria using nested dynamicForms as described in CanvasItem.setCriterionGetter.

Implementation checks for this.canvas being specified as a DynamicForm, and applies criterion directly to the embedded form via setValuesAsCriteria().

Overrides:

setCriterionSetter in class FormItem

Parameters:

setter - provides a method to update this field with the edited criterion