Package com.google.gwt.user.cellview.client

## Class AbstractPager

- java.lang.Object
- - com.google.gwt.user.client.ui.UIObject
  - - com.google.gwt.user.client.ui.Widget
    - - com.google.gwt.user.client.ui.Composite
      - - com.google.gwt.user.cellview.client.AbstractPager

- All Implemented Interfaces:
    `HasAttachHandlers`, `HasHandlers`, `EventListener`, `HasVisibility`, `IsRenderable`, `IsWidget`
  Direct Known Subclasses:
    `PageSizePager`, `SimplePager`

      public abstract class AbstractPager
      extends Composite

  An abstract pager that exposes many methods useful for paging.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

      `UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled`

  - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `(package private) HandlerRegistration` | `rangeChangeHandler` |
    `(package private) HandlerRegistration` | `rowCountChangeHandler` |

    - ### Fields inherited from class com.google.gwt.user.client.ui.UIObject

      `DEBUG_ID_PREFIX`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `AbstractPager()` |

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `protected void` | `firstPage()` | Go to the first page.
    `HasRows` | `getDisplay()` | Get the `HasRows` being paged.
    `protected int` | `getPage()` | Get the current page index.
    `protected int` | `getPageCount()` | Get the number of pages based on the data size.
    `int` | `getPageSize()` | Get the page size.
    `int` | `getPageStart()` | Get the page start index.
    `protected boolean` | `hasNextPage()` | Returns true if there is enough data such that a call to `nextPage()` will succeed in moving the starting point of the table forward.
    `protected boolean` | `hasNextPages​(int pages)` | Returns true if there is enough data to display a given number of additional pages.
    `protected boolean` | `hasPage​(int index)` | Returns true if there is enough data such that the specified page is within range.
    `protected boolean` | `hasPreviousPage()` | Returns true if there is enough data such that a call to `previousPage()` will succeed in moving the starting point of the table backward.
    `protected boolean` | `hasPreviousPages​(int pages)` | Returns true if there is enough data to display a given number of previous pages.
    `boolean` | `isRangeLimited()` | Check if the page should be limited to the actual data size.
    `protected void` | `lastPage()` | Go to the last page.
    `protected void` | `lastPageStart()` | Set the page start to the last index that will still show a full page.
    `protected void` | `nextPage()` | Advance the starting row by 'pageSize' rows.
    `protected abstract void` | `onRangeOrRowCountChanged()` | Called when the range or row count changes.
    `protected void` | `previousPage()` | Move the starting row back by 'pageSize' rows.
    `void` | `setDisplay​(HasRows display)` | Set the `HasRows` to be paged.
    `protected void` | `setPage​(int index)` | Go to a specific page.
    `protected void` | `setPageSize​(int pageSize)` | Set the page size of the display.
    `protected void` | `setPageStart​(int index)` | Set the page start index.
    `void` | `setRangeLimited​(boolean isRangeLimited)` | Set whether or not the page range should be limited to the actual data size.

    - ### Methods inherited from class com.google.gwt.user.client.ui.Composite

      `claimElement, getWidget, initializeClaimedElement, initWidget, isAttached, onAttach, onBrowserEvent, onDetach, render, render, resolvePotentialElement, setWidget`

    - ### Methods inherited from class com.google.gwt.user.client.ui.Widget

      `addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isOrWasAttached, onLoad, onUnload, removeFromParent, setLayoutData, sinkEvents, unsinkEvents`

    - ### Methods inherited from class com.google.gwt.user.client.ui.UIObject

      `addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### rangeChangeHandler

          HandlerRegistration rangeChangeHandler

    - #### rowCountChangeHandler

          HandlerRegistration rowCountChangeHandler

  - ### Constructor Detail

    - #### AbstractPager

          public AbstractPager()

  - ### Method Detail

    - #### getDisplay

          public HasRows getDisplay()

      Get the `HasRows` being paged.
      Returns:
        the `HasRows`
      See Also:
        `setDisplay(HasRows)`

    - #### getPageSize

          public int getPageSize()

      Get the page size.
      Returns:
        the page size, or -1 if the display is not set
      See Also:
        `setPageSize(int)`

    - #### getPageStart

          public int getPageStart()

      Get the page start index.
      Returns:
        the page start index, or -1 if the display is not set
      See Also:
        `setPageStart(int)`

    - #### isRangeLimited

          public boolean isRangeLimited()

      Check if the page should be limited to the actual data size. Defaults to true.
      Returns:
        true if the range is limited to the data size
      See Also:
        `setRangeLimited(boolean)`

    - #### setRangeLimited

          public void setRangeLimited​(boolean isRangeLimited)

      Set whether or not the page range should be limited to the actual data size. If true, all operations will adjust so that there is always data visible on the page.
      Parameters:
        `isRangeLimited` - true to limit the range, false not to
      See Also:
        `isRangeLimited()`

    - #### setDisplay

          public void setDisplay​(HasRows display)

      Set the `HasRows` to be paged.
      Parameters:
        `display` - the `HasRows`
      See Also:
        `getDisplay()`

    - #### firstPage

          protected void firstPage()

      Go to the first page.

    - #### getPage

          protected int getPage()

      Get the current page index.

      Since the page start index can be set to any value, its possible to be between pages. In this case, the return value is the number of times `previousPage()` can be called.

      Returns:
        the page index, or -1 if the display is not set
      See Also:
        `setPage(int)`

    - #### getPageCount

          protected int getPageCount()

      Get the number of pages based on the data size.
      Returns:
        the page count, or -1 if the display is not set

    - #### hasNextPage

          protected boolean hasNextPage()

      Returns true if there is enough data such that a call to `nextPage()` will succeed in moving the starting point of the table forward.
      Returns:
        true if there is a next page

    - #### hasNextPages

          protected boolean hasNextPages​(int pages)

      Returns true if there is enough data to display a given number of additional pages.
      Parameters:
        `pages` - the number of pages to query
      Returns:
        true if there are `pages` next pages

    - #### hasPage

          protected boolean hasPage​(int index)

      Returns true if there is enough data such that the specified page is within range.
      Parameters:
        `index` - the page index
      Returns:
        true if the specified page is in range

    - #### hasPreviousPage

          protected boolean hasPreviousPage()

      Returns true if there is enough data such that a call to `previousPage()` will succeed in moving the starting point of the table backward.
      Returns:
        true if there is a previous page

    - #### hasPreviousPages

          protected boolean hasPreviousPages​(int pages)

      Returns true if there is enough data to display a given number of previous pages.
      Parameters:
        `pages` - the number of previous pages to query
      Returns:
        true if there are `pages` previous pages

    - #### lastPage

          protected void lastPage()

      Go to the last page.

    - #### lastPageStart

          protected void lastPageStart()

      Set the page start to the last index that will still show a full page.

    - #### nextPage

          protected void nextPage()

      Advance the starting row by 'pageSize' rows.

    - #### onRangeOrRowCountChanged

          protected abstract void onRangeOrRowCountChanged()

      Called when the range or row count changes. Implement this method to update the pager.

    - #### previousPage

          protected void previousPage()

      Move the starting row back by 'pageSize' rows.

    - #### setPage

          protected void setPage​(int index)

      Go to a specific page.
      Parameters:
        `index` - the page index
      See Also:
        `getPage()`

    - #### setPageSize

          protected void setPageSize​(int pageSize)

      Set the page size of the display.
      Parameters:
        `pageSize` - the new page size
      See Also:
        `getPageSize()`

    - #### setPageStart

          protected void setPageStart​(int index)

      Set the page start index.
      Parameters:
        `index` - the index
      See Also:
        `getPageStart()`