litesoft
@ 965
litesoft / trunk / GWT_Sandbox / FormEngine / src / com / temp / foundation / client / widget / table / datatableadapter / EIS_DataTable.java
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package com.temp.foundation.client.widget.table.datatableadapter; import com.google.gwt.cell.client.*; import com.google.gwt.cell.client.Cell.*; import com.google.gwt.core.client.*; import com.google.gwt.dom.client.Element; import com.google.gwt.dom.client.*; import com.google.gwt.dom.client.Style.*; import com.google.gwt.event.dom.client.*; import com.google.gwt.event.shared.*; import com.google.gwt.safehtml.client.*; import com.google.gwt.safehtml.shared.*; import com.google.gwt.user.cellview.client.*; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.ui.*; import com.google.gwt.view.client.*; import java.util.*; /** * Derived from: * https://p4db.amazon.com/source-views/p4db/brazil/fileViewer * .cgi?FSPC=//brazil/src/appgroup/webservices/apps/AWSConsole-GWT-Widgets/mainline/src/com/amazonaws/console/gwt/ui/DataTable.java&REV=3 * <p/> * This widget is derived from DataGrid, and behaves very similar to it, * except that it adds interactively resize-able columns, and an AWS * console look and feel. * <p/> * <p/> * Although this widget is functionally equivalent to a DataGrid, it can't * be used in exactly the same way as a DataGrid can be used. The following * additional rules must be followed for this table to work correctly. * <p/> * <p><ol> * <li> * Since the data area of this widget scrolls and therefore has no predetermined * size, this table should be placed inside a LayoutPanel. If it's not, then you * need to modify the positioning attributes of <tt>DataGrid.getElement().getStyle()</tt> * to make it takes up non-zero vertical space, and call {@link #onResize() onResize} * whenever the size of the table area may have changed. * <li> * For this table to function correctly, developers should not set the width of * columns directly using one of the setColumnWidth methods. Instead, they should * call setFixedColumnWidth to set the width of fixed-width columns, or * setRelativeColumnWidth to set the relative width of columns that should expand * to fill whatever space is not used by fixed-width columns. These functions * should generally only be used once to set the initial width of columns when * they are added to the table, or to show a column that was previously hidden by * calling clearColumnWidth, because otherwise user's column width adjustments * could be lost. * <li> * DataGrid always used fixed table layout. A good layout strategy is to call * setWidth("100%"), and to have at least one relative width column that will * expand to fill any space not used by fixed-width columns. NOTE: this means * that you *must* call setFixedColumnWidth or setRelativeColumnWidth, or a * column will not be visible. * </ol> * * @param <T> Type of data object stored in the table. * * @author Stephen Saville (saville@amazon.com) */ public class EIS_DataTable<T> extends DataGrid<T> implements RequiresResize, MouseDownHandler, MouseMoveHandler, MouseUpHandler { public static final int DEFAULT_PAGE_SIZE = 15; public static final String RESIZE_HANDLE_ATTRIBUTE = "resize-col"; public static final String TABLE_CONTAINER_CLASS_NAME = "aws-DataTableContainer"; interface Templates extends SafeHtmlTemplates { @Template("<div class=\"{0}\">") SafeHtml resizableHeaderCellPrefix( String headerClassName ); @Template("<div " + RESIZE_HANDLE_ATTRIBUTE + "=\"{0}\" class=\"{1}\"> </div></div>") SafeHtml resizableHeaderCellSuffix( int col, String resizeHandleClassName ); } private static final Templates TEMPLATES = GWT.create( Templates.class ); public class DataTableOverlayHeaderCell<V> implements Cell<V> { private final Cell<V> delegate; public DataTableOverlayHeaderCell( Cell<V> delegate ) { this.delegate = delegate; } public boolean dependsOnSelection() { return delegate.dependsOnSelection(); } public Set<String> getConsumedEvents() { return delegate.getConsumedEvents(); } public boolean handlesSelection() { return delegate.handlesSelection(); } public boolean isEditing( com.google.gwt.cell.client.Cell.Context context, Element parent, V value ) { return delegate.isEditing( context, parent, value ); } public void onBrowserEvent( com.google.gwt.cell.client.Cell.Context context, Element parent, V value, NativeEvent event, ValueUpdater<V> valueUpdater ) { delegate.onBrowserEvent( context, parent, value, event, valueUpdater ); } public void render( com.google.gwt.cell.client.Cell.Context context, V value, SafeHtmlBuilder sb ) { sb.append( TEMPLATES.resizableHeaderCellPrefix( styles.dataTableHeader() ) ); delegate.render( context, value, sb ); sb.append( TEMPLATES.resizableHeaderCellSuffix( context.getColumn(), styles.dataTableResizeHandle() ) ); } public boolean resetFocus( com.google.gwt.cell.client.Cell.Context context, Element parent, V value ) { return delegate.resetFocus( context, parent, value ); } public void setValue( com.google.gwt.cell.client.Cell.Context context, Element parent, V value ) { delegate.setValue( context, parent, value ); } } public class DataTableOverlayHeader<V> extends Header<V> { private final Header<V> delegate; public DataTableOverlayHeader( Header<V> delegate ) { super( new DataTableOverlayHeaderCell<V>( delegate.getCell() ) ); this.delegate = delegate; } public Object getKey() { return delegate.getKey(); } public V getValue() { return delegate.getValue(); } public void onBrowserEvent( Context context, Element elem, NativeEvent event ) { delegate.onBrowserEvent( context, elem, event ); } public void setUpdater( ValueUpdater<V> updater ) { delegate.setUpdater( updater ); } } public <V> DataTableOverlayHeader<V> overlayHeader( Header<V> header ) { return new DataTableOverlayHeader<V>( header ); } public class DataTableSafeHtmlHeaderCell extends AbstractCell<SafeHtml> { @Override public void render( com.google.gwt.cell.client.Cell.Context context, SafeHtml value, SafeHtmlBuilder sb ) { sb.append( TEMPLATES.resizableHeaderCellPrefix( styles.dataTableHeader() ) ); sb.append( value ); sb.append( TEMPLATES.resizableHeaderCellSuffix( context.getColumn(), styles.dataTableResizeHandle() ) ); } } public class DataTableSafeHtmlHeader extends Header<SafeHtml> { private SafeHtml value; public DataTableSafeHtmlHeader( SafeHtml html ) { super( new DataTableSafeHtmlHeaderCell() ); this.value = html; } public DataTableSafeHtmlHeader( String text ) { this( SafeHtmlUtils.fromString( text ) ); } @Override public SafeHtml getValue() { return value; } } private final Map<Column<T, ?>, Double> relativeWidthColumns = new LinkedHashMap<Column<T, ?>, Double>(); private final Set<Column<T, ?>> fixedWidthColumns = new HashSet<Column<T, ?>>(); private final EIS_DataTableStyle styles; private static final int MIN_RESIZED_WIDTH = 10; private boolean resizingColumns = false; private Column<T, ?> resizeLeftColumn, resizeRightColumn; private int resizeLeftX, resizeRightX, resizeTotalWidth, borderOverhead; private HandlerRegistration mouseMoveRegistration, mouseUpRegistration; private static BrowserTableResizeSupport RESIZE_SUPPORT; public EIS_DataTable() { this( DEFAULT_PAGE_SIZE ); } public EIS_DataTable( int pageSize, ProvidesKey<T> keyProvider ) { this( pageSize, GWT.<EIS_DataTableResources>create( EIS_DataTableResources.class ), keyProvider ); } public EIS_DataTable( int pageSize ) { this( pageSize, new SimpleKeyProvider<T>() ); } public EIS_DataTable( ProvidesKey<T> keyProvider ) { this( DEFAULT_PAGE_SIZE, keyProvider ); } public EIS_DataTable( int pageSize, EIS_DataTableResources resources, ProvidesKey<T> keyProvider ) { super( pageSize, resources, keyProvider ); styles = resources.dataGridStyle(); borderOverhead = styles.cellBorderWidth(); finiInit(); } public EIS_DataTable( int pageSize, EIS_DataTableResources resources, ProvidesKey<T> keyProvider, Widget loadingIndicator ) { super( pageSize, resources, keyProvider, loadingIndicator ); styles = resources.dataGridStyle(); borderOverhead = styles.cellBorderWidth(); finiInit(); } private void finiInit() { if ( RESIZE_SUPPORT == null ) { RESIZE_SUPPORT = GWT.create( BrowserTableResizeSupport.class ); } addDomHandler( this, MouseDownEvent.getType() ); } @Override public void addColumn( Column<T, ?> col ) { super.addColumn( col, new DataTableSafeHtmlHeader( SafeHtmlUtils.EMPTY_SAFE_HTML ) ); } @Override public void addColumn( Column<T, ?> col, SafeHtml headerHtml ) { super.addColumn( col, new DataTableSafeHtmlHeader( headerHtml ) ); } @Override public void addColumn( Column<T, ?> col, String headerString ) { super.addColumn( col, new DataTableSafeHtmlHeader( headerString ) ); } @Override public void addColumn( Column<T, ?> col, Header<?> header ) { super.addColumn( col, overlayHeader( header ) ); } @Override public void addColumn( Column<T, ?> col, Header<?> header, Header<?> footer ) { super.addColumn( col, overlayHeader( header ), footer ); } @Override public void addColumn( Column<T, ?> col, String headerString, String footerString ) { super.addColumn( col, new DataTableSafeHtmlHeader( headerString ), new TextHeader( footerString ) ); } @Override public void addColumn( Column<T, ?> col, SafeHtml headerHtml, SafeHtml footerHtml ) { super.addColumn( col, new DataTableSafeHtmlHeader( headerHtml ), new SafeHtmlHeader( footerHtml ) ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col, Header<?> header ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, header ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col, SafeHtml headerHtml ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, headerHtml ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col, SafeHtml headerHtml, SafeHtml footerHtml ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, headerHtml, footerHtml ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col, String headerString ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, headerString ); } @Override public void insertColumn( int beforeIndex, Column<T, ?> col, String headerString, String footerString ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, headerString, footerString ); } /** * Everything goes thru here! */ @Override public void insertColumn( int beforeIndex, Column<T, ?> col, Header<?> header, Header<?> footer ) { // todo: we need to proxy so that we can control all this! super.insertColumn( beforeIndex, col, header, footer ); } @Override public void removeColumn( int index ) { removeColumn( getColumn( index ) ); } @Override public void removeColumn( Column<T, ?> col ) { super.removeColumn( col ); removeTrackedColumnWidths( col ); } @Override public void setColumnWidth( Column<T, ?> column, String width ) { if ( !width.endsWith( Unit.PCT.getType() ) ) { setFixedColumnWidth( column, width ); } else { setRelativeColumnWidth( column, Double.parseDouble( width.substring( 0, width.length() - Unit.PCT.getType().length() ) ) ); } } protected void superSetColumnWidth( Column<T, ?> column, String width ) { super.setColumnWidth( column, width ); } protected void setOnResizeColumnWidthInPixels( Column<T, ?> column, int resizedWidth ) { superSetColumnWidth( column, "" + RESIZE_SUPPORT.adjustColumnWidthInPixelsForBorder( borderOverhead, resizedWidth ) + Unit.PX ); } private void setFixedColumnWidth( Column<T, ?> column, String fixedWidth ) { removeTrackedColumnWidths( column ); if ( -1 != getColumnIndex( column ) ) { fixedWidthColumns.add( column ); } superSetColumnWidth( column, fixedWidth ); } /** * Set the relative width of a column that should expand to take up any * space not used by fixed-width columns. Relative widths are normalized * across relative width columns, so, for example, if you add two columns * with relatives widths of 1 and 2, then the first column will take up * 33% of the available space, and the second column will take up 66% of * the available space. If you were to add a third column with a relative * width of 1, then the columns would take up 25%, 50% and 25% of the * available space, respectively. * * @param column Column to set the relative width of. * @param relativeWidth Relative column width. */ public void setRelativeColumnWidth( Column<T, ?> column, double relativeWidth ) { clearColumnWidth( column ); if ( -1 != getColumnIndex( column ) ) { relativeWidthColumns.put( column, relativeWidth ); } } /** * Set the width of a fixed-width column. * * @param column Column to set the width of. * @param fixedWidth Fixed width in the given units. * @param unit Fixed width unit, such as {@link Unit#PX}. Must <it>not</it> be {@link Unit#PCT}. */ public void setFixedColumnWidth( Column<T, ?> column, double fixedWidth, Unit unit ) { if ( Unit.PCT.equals( unit ) ) { throw new IllegalArgumentException( "PCT (percent) is NOT applicable to Fixed Column Width" ); } setFixedColumnWidth( column, "" + fixedWidth + unit ); } /** * Set the width of a fixed-width column. * * @param column Column to set the width of. * @param pixelWidth Fixed width in pixels. */ public void setFixedColumnWidth( Column<T, ?> column, int pixelWidth ) { setFixedColumnWidth( column, "" + pixelWidth + Unit.PX ); } /** * Clear the width of a column. This will make the column disappear. * * @param column Column to clear the width of. */ @Override public void clearColumnWidth( Column<T, ?> column ) { removeTrackedColumnWidths( column ); // clear the width of this column super.clearColumnWidth( column ); } private void removeTrackedColumnWidths( Column<T, ?> col ) { relativeWidthColumns.remove( col ); fixedWidthColumns.remove( col ); } @Override public void onResize() { super.onResize(); if ( !resizePending ) { if ( !isAttached() ) { resizePending = true; } else if ( !resizeColumns() ) { resizePending = true; launchResizer(); } } } @Override protected void onAttach() { super.onAttach(); if ( resizePending ) { launchResizer(); } } @Override protected void onDetach() { super.onDetach(); onMouseUp( null ); // Cleanup dynamic Handlers killResizer(); } private static final int INITIAL_RESIZE_DELAY_MILLIS = 100; private boolean resizePending; private Timer resizeTimer; private int currentResizeDelay; private void killResizer() { if ( resizeTimer != null ) { resizeTimer.cancel(); resizeTimer = null; } } private void launchResizer() { killResizer(); (resizeTimer = new Timer() { @Override public void run() { if ( isAttached() && resizePending ) { if ( resizeColumns() ) { resizePending = false; resizeTimer = null; return; } currentResizeDelay += currentResizeDelay; Timer timer = resizeTimer; // Snag a reference if ( (timer != null) && (currentResizeDelay < 12800) ) { timer.schedule( currentResizeDelay ); return; } } resizeTimer = null; } }).schedule( currentResizeDelay = INITIAL_RESIZE_DELAY_MILLIS ); } /** * @return true is resizing was successful! */ protected boolean resizeColumns() { Element headerRow = getTableHeadElement().getRows().getItem( 0 ); if ( headerRow == null ) { return false; // No Header Row? } NodeList<Node> headerRowChildren = headerRow.getChildNodes(); int headerRowChildCount = headerRowChildren.getLength(); if ( headerRowChildCount == 0 ) { return false; // No Columns? } int availableWidth = getElement().getClientWidth(); if ( availableWidth < (headerRowChildCount * 10) ) { return false; // Overall Sizing is probably not Working Yet or ? } // find the width of all fixed-width columns, in pixels Set<Column<T, ?>> unspecifiedColumnWidths = new HashSet<Column<T, ?>>(); int totalWidthOfFixedColumns = 0; for ( int i = 0, col = 0; i < headerRowChildCount; i++, col++ ) { Node child = headerRowChildren.getItem( i ); if ( Element.is( child ) ) { Element childElement = Element.as( child ); int columnWidth = RESIZE_SUPPORT.getColumnWidthInPixels( borderOverhead, childElement ); if ( columnWidth < 1 ) { return false; // Sizing Not Working Yet } Column<T, ?> column = getColumn( col ); if ( !relativeWidthColumns.containsKey( column ) ) { if ( fixedWidthColumns.contains( column ) ) { totalWidthOfFixedColumns += columnWidth; } else { unspecifiedColumnWidths.add( column ); } } } } if ( relativeWidthColumns.isEmpty() && unspecifiedColumnWidths.isEmpty() ) { System.out.println( "No Column Adjustability Allowed *** Probable Specification Error ***" ); return true; // Nothing to do! } if ( !unspecifiedColumnWidths.isEmpty() ) { double relativeWidth = getCurrentRelativeMinimumWidth(); for ( Column<T, ?> column : unspecifiedColumnWidths ) { setRelativeColumnWidth( column, relativeWidth ); } } distributeToRelativeWidthColumns( availableWidth - totalWidthOfFixedColumns ); // finally adjust child column widths redraw(); return true; } private double getCurrentRelativeMinimumWidth() { double lowest = 100; // 100% for ( Double value : relativeWidthColumns.values() ) { if ( value < lowest ) { lowest = value; } } return lowest; } protected void applyColumnResize( final int clientX ) { if ( ((resizeLeftX + MIN_RESIZED_WIDTH) < clientX) && (clientX < (resizeRightX - MIN_RESIZED_WIDTH)) ) { int leftWidth = clientX - resizeLeftX; int rightWidth = resizeRightX - clientX; // fix up new widths in case they don't add up correctly int totalWidth = leftWidth + rightWidth; if ( totalWidth != resizeTotalWidth ) { int totalAdjustment = resizeTotalWidth - totalWidth; int leftAdjustment = totalAdjustment / 2; int rightAdjustment = totalAdjustment - leftAdjustment; leftWidth += leftAdjustment; rightWidth += rightAdjustment; } setFixedColumnWidth( resizeLeftColumn, leftWidth, Unit.PX ); setFixedColumnWidth( resizeRightColumn, rightWidth, Unit.PX ); } redraw(); } protected void startColumnResize( final int col, final Element target, final int clientX ) { resizeLeftColumn = getColumn( col ); resizeRightColumn = getColumn( col + 1 ); NodeList<TableCellElement> headerCells = getTableHeadElement().getRows().getItem( 0 ).getCells(); TableCellElement leftTableHeader = headerCells.getItem( col ); TableCellElement rightTableHeader = headerCells.getItem( col + 1 ); int leftWidth = RESIZE_SUPPORT.getColumnWidthInPixels( borderOverhead, leftTableHeader ); int rightWidth = RESIZE_SUPPORT.getColumnWidthInPixels( borderOverhead, rightTableHeader ); resizeLeftX = clientX - leftWidth; resizeRightX = clientX + rightWidth; resizeTotalWidth = leftWidth + rightWidth; } @Override public void onMouseDown( MouseDownEvent event ) { if ( !resizingColumns ) { EventTarget eventTarget = event.getNativeEvent().getEventTarget(); if ( !Element.is( eventTarget ) ) { return; } final Element target = Element.as( eventTarget ); if ( target.hasAttribute( RESIZE_HANDLE_ATTRIBUTE ) ) { // figure out which column this event is for int col = Integer.parseInt( target.getAttribute( RESIZE_HANDLE_ATTRIBUTE ) ); if ( col < getColumnCount() - 1 ) { startColumnResize( col, target, event.getClientX() ); resizingColumns = true; RootLayoutPanel root = RootLayoutPanel.get(); if ( mouseMoveRegistration == null ) { mouseMoveRegistration = root.addDomHandler( this, MouseMoveEvent.getType() ); } if ( mouseUpRegistration == null ) { mouseUpRegistration = root.addDomHandler( this, MouseUpEvent.getType() ); } } } } } @Override public void onMouseMove( MouseMoveEvent event ) { if ( resizingColumns ) { applyColumnResize( event.getClientX() ); } } public void onMouseUp( com.google.gwt.event.dom.client.MouseUpEvent event ) { if ( resizingColumns ) { resizingColumns = false; if ( mouseMoveRegistration != null ) { mouseMoveRegistration.removeHandler(); mouseMoveRegistration = null; } if ( mouseUpRegistration != null ) { mouseUpRegistration.removeHandler(); mouseUpRegistration = null; } } } private static class RelativeWidthColumnControl<T> implements Comparable<RelativeWidthColumnControl<T>> { private Column<T, ?> column; private double width; private int desiredPixelWidth; public RelativeWidthColumnControl( Column<T, ?> column, double width ) { this.column = column; this.width = width; } public Column<T, ?> getColumn() { return column; } public double getWidth() { return width; } public int getDesiredPixelWidth() { return desiredPixelWidth; } /** * Note CompareTo NOT compatible with equals()! */ @Override public int compareTo( RelativeWidthColumnControl<T> them ) { if ( them.width > this.width ) { return 1; } if ( them.width < this.width ) { return -1; } return 0; } public int distribute( int available, int overColumnsRemaining, double remainingTotalWidths ) { if ( overColumnsRemaining == 1 ) { desiredPixelWidth = Math.max( available, MIN_RESIZED_WIDTH ); return 0; } double proportionatePixels = available * (width / remainingTotalWidths); // percentage if ( overColumnsRemaining < 10 ) { // favor the end... proportionatePixels += (10 - overColumnsRemaining) / 10f; } int pixels = Math.min( (int) proportionatePixels, available ); desiredPixelWidth = Math.max( pixels, MIN_RESIZED_WIDTH ); return available - pixels; } } private void distributeToRelativeWidthColumns( int pixelsToDistribute ) { // create List & sum Relative Widths List<RelativeWidthColumnControl<T>> controls = new ArrayList<RelativeWidthColumnControl<T>>( relativeWidthColumns.size() ); double totalWidths = 0; for ( Map.Entry<Column<T, ?>, Double> entry : relativeWidthColumns.entrySet() ) { Double proportionateWidth = entry.getValue(); controls.add( new RelativeWidthColumnControl<T>( entry.getKey(), proportionateWidth ) ); totalWidths += proportionateWidth; } // Distribute the Pixels for ( int i = 0; i < controls.size(); i++ ) { RelativeWidthColumnControl<T> control = controls.get( i ); pixelsToDistribute = control.distribute( pixelsToDistribute, controls.size() - i, totalWidths ); setOnResizeColumnWidthInPixels( control.getColumn(), RESIZE_SUPPORT.adjustColumnWidthInPixelsForBorder( borderOverhead, control.getDesiredPixelWidth() ) ); totalWidths -= control.getWidth(); } } } |
Commits for litesoft/trunk/GWT_Sandbox/FormEngine/src/com/temp/foundation/client/widget/table/datatableadapter/EIS_DataTable.java
Revision | Author | Commited | Message |
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965 | GeorgeS | Fri 01 Aug, 2014 03:20:35 +0000 | ! |