The ADF tree fades after adding a button after the tag from the tree of the ADF

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• Adding static button in a drop-down list

  Hi all

  I add a list to verticalFieldManager with vertical scrolling function, and in the same crib from the bottom, I need to add a button (after clicking on the button I have to go on the other screen).

  Here, my problem is that whenever I scroll the list, the button does not scroll, it should look like the button on the top of the display to scroll and the list in the background. But whenever I scroll the list, list a scroll at the bottom of button.

  For more information, I add a screenshot, please find the attachment.

  I'd have a play with this, the thought took a little more time than I expected and there are a few "curve balls.

  In any case, here's some code that can do what you want.  There's some stuff in there, but see how you get on the revision of the code and the doc and the items I gave you to, to see if you can understand what is happening.

  Tested on OS 6.0 Simulator 9800, not on anything else.

  package mypackage;
  
  import java.util.Vector;
  
  import net.rim.device.api.system.Display;
  import net.rim.device.api.ui.Color;
  import net.rim.device.api.ui.Font;
  import net.rim.device.api.ui.Graphics;
  import net.rim.device.api.ui.Manager;
  import net.rim.device.api.ui.ScrollChangeListener;
  import net.rim.device.api.ui.TouchEvent;
  import net.rim.device.api.ui.XYRect;
  import net.rim.device.api.ui.component.ButtonField;
  import net.rim.device.api.ui.component.LabelField;
  import net.rim.device.api.ui.component.ListField;
  import net.rim.device.api.ui.component.ListFieldCallback;
  import net.rim.device.api.ui.component.SeparatorField;
  import net.rim.device.api.ui.component.Status;
  import net.rim.device.api.ui.container.MainScreen;
  import net.rim.device.api.ui.container.VerticalFieldManager;
  
  public class StaticButtonTestScreen extends MainScreen implements ListFieldCallback{
  
      private static int NUMBER_OF_ROWS_TO_ADD = 50;
      private static int NUMBER_OF_COLUMNS_TO_DISPLAY = 6;
  
      private Vector _listElements = new Vector();
      // We use a pretty crude method to supply the items to be displayed
      private ListField _listField;
      private int _requiredColumnWidth;
  
      StaticButtonTestScreen(){
  
          //! how wide will we make the columns?
          Font ourFont = this.getFont();
          _requiredColumnWidth = ourFont.getAdvance(" column 8 ");
          //! this example has fixed column widths.  They do not have to be.  Fixed is just simple to demonstrate.
  
          this.add(new LabelField("Above ListField", LabelField.FOCUSABLE));
          this.add(new SeparatorField());
          //! Add the ListField to a HorizontalFieldMaanger that can scroll horizontally.
          //! It is this that does the scrolling for us.
          StaticButtonManager myMan = new StaticButtonManager();
  
          //! Note the overridden methods in our ListField.
          _listField = new ListField() {
              //! OVerride layout so that you get the ListField defined the width that you want.
              protected void layout(int maxWidth, int maxHeight) {
                  int requiredWidth = Math.min(maxWidth, this.getPreferredWidth());
                  super.layout(requiredWidth, maxHeight);
              }
          };
          VerticalFieldManager vfm = new VerticalFieldManager(Manager.VERTICAL_SCROLLBAR | Manager.VERTICAL_SCROLL);
          // Put ListField in here so that it scrolls
          _listField.setCallback(this);
          _listField.setSize(NUMBER_OF_ROWS_TO_ADD);
          // setSearchable(true) so a key stroke will invoke indexOfList().  Try it
          _listField.setSearchable(true);
          for(int count = 0; count < NUMBER_OF_ROWS_TO_ADD; ++count) {
              String listItem = Integer.toString(count) + ".";
              _listElements.insertElementAt(listItem, count);
        }
          vfm.add(_listField);
          myMan.add(vfm);
          ButtonField bf = new SpecialButtonField("test");
          myMan.add(bf);
          this.add(myMan);
          this.add(new SeparatorField());
          this.add(new LabelField("Below ListField", LabelField.FOCUSABLE));
      }
  
      // Following methods are required by the ListFieldCallback interface
  
      public void drawListRow(ListField listField, Graphics graphics, int index, int y, int width) {
  
          int columnWidth = width/NUMBER_OF_COLUMNS_TO_DISPLAY;
          //! Use the width that we have, not the width we requested.
          //! There is a chance that they might be different, though I suspect this would only
          //! be seen during development when perhaps changes have not be made consistently. 
  
          int xpos = 0;
  
          // First column test data supplied from program
          String suppliedData = (String) this.get(listField, index);
          graphics.setColor(Color.BLACK);
          graphics.drawText(suppliedData, xpos, y);
          xpos +=  columnWidth;
  
          // Dummy up the other columns.....
          graphics.setColor(Color.RED);
          for ( int i = 1; i < NUMBER_OF_COLUMNS_TO_DISPLAY; i++ ) {
              graphics.drawText("c" + Integer.toString(i), xpos, y);
              xpos +=  columnWidth;
          }
  
      }
  
      public Object get(ListField listField, int index) {
           return _listElements.elementAt(index);
      }
  
      //! In theory, the "framework" can call this, so it should return the same
      //! value as the overridden getPreferredWidth().  But my testing suggests this is
      //! is actually never called.  But for consistency, set it correctly!
      public int getPreferredWidth(ListField litfield) {
          return _requiredColumnWidth * NUMBER_OF_COLUMNS_TO_DISPLAY;
      }
  
      // People don't know how to use this, so I'm coding this up as an example
      // In the sample code you can use the digits to find things...
      public int indexOfList(ListField listField, String prefix, int start) {
          // Search from where we currently are forward.
          for ( int i = start; i < _listElements.size(); i++ ) {
              String element = (String) this.get(listField, i);
              if ( element != null && prefix != null ) {
                  // Just being careful
                  if ( element.startsWith(prefix) ) {
                      return i;
                  }
              }
          }
          // Not found, search from beginning to where we are currently
          for ( int i = 0; i < start; i++ ) {
              String element = (String) this.get(listField, i);
              if ( element != null && prefix != null ) {
                  // Just being careful
                  if ( element.startsWith(prefix) ) {
                      return i;
                  }
              }
          }
          // Didn't find it, don't move....
          return start;
      }
  
  // Special Manager so that we can overlay the Fields
  // and because the standard optimised paint does not
  // cope with this, we need to invalidate() the Field on scroll to get
  // it repainted.
  
  // We also have a bit of work around
  
  class StaticButtonManager extends Manager implements ScrollChangeListener {
      // Implement ScrollChangeListener so tha on a scroll, we repaint
      // because the default action is optimised and does not cope
      // with the overlaid Fields.
      boolean scrollListenerSet = false;
      SpecialButtonField bf = null;
      XYRect ourExtent = new XYRect();
      public StaticButtonManager() {
          super(Manager.NO_VERTICAL_SCROLL | Manager.USE_ALL_HEIGHT);
      }
      // Override paintBackground just so we can see the extent of this Manager
      // Not necessary, just done to make it easier to see.
      public void paintBackground(Graphics g) {
          int currentBackgroundColor = g.getBackgroundColor();
          try {
              g.setBackgroundColor(0X00CCCCCC);
              g.clear();
          } finally {
              g.setBackgroundColor(currentBackgroundColor);
          }
      }
      // Only expect two Fields
      // 1) A VFM which will scroll to handle the ListField
      // 2) A button that we will stuck at the bottom right
      protected void sublayout(int maxWidth, int maxHeight) {
          maxHeight = Display.getHeight()/2;
          // Set the Height that the ListField will use when scrolling.
          if ( this.getFieldCount() != 2 ) {
              throw new RuntimeException("Incorrect number of Fields added");
          }
          VerticalFieldManager listFieldManager = (VerticalFieldManager) this.getField(0);
          if ( !scrollListenerSet ) {
              scrollListenerSet = true;
              listFieldManager.setScrollListener(this);
          }
          super.layoutChild(listFieldManager, maxWidth, maxHeight);
          super.setPositionChild(listFieldManager, 0, 0);
          if ( listFieldManager.getHeight() < maxHeight ) {
              maxHeight = listFieldManager.getHeight();
          }
          bf = (SpecialButtonField) this.getField(1);
          super.layoutChild(bf, maxWidth, maxHeight);
          super.setPositionChild(bf, maxWidth - bf.getWidth(), maxHeight - bf.getHeight());
          setExtent(maxWidth, maxHeight);
  
      }
      public void scrollChanged(Manager manager, int newHorizontalScroll, int newVerticalScroll) {
          this.invalidate(); // repaint everything....
      }
      /*
       * Might be needed, comment out code just in case
      public int getFieldAtLocation(int x, int y) {
          if ( x >= this.getWidth() - bf.getWidth() &&
               y >= this.getHeight() - bf.getHeight() ) {
              return 1;
          }
          return super.getFieldAtLocation(x, y);
      }
      */
      // Just used to allow the user to use the trackpad to go horizontally and select the button.
      // Not really needed
      protected boolean navigationMovement(int dx, int dy, int status, int time) {
          boolean buttonInFocus = bf.isFocus();
          if ( dx > 0 && !buttonInFocus ) {
              bf.setFocus();
              return true;
          } else
          if ( dx < 0 && buttonInFocus ) {
              this.getField(0).setFocus();
              return true;
          }
          return super.navigationMovement(dx, dy, status, time);
      }
      // Because the Button keeps moving in relation t the manager
      // and the manager does not expect this,
      // We have to check the touch location ourselves
      protected boolean touchEvent(TouchEvent message) {
          int x = message.getX( 1 );
          int y = message.getY( 1 );
          getExtent(ourExtent);
          if( x < 0 || y < 0 || x > ourExtent.width || y > ourExtent.height ) {
                  // Outside the field
                  return false;
          }
          if ( x >= ourExtent.width - bf.getWidth() &&
               y >= ourExtent.height - bf.getHeight() ) {
              bf.onClick();
              return true;
          }
          return false;
      }
  }
  // Special Button so that the Button can be clicked from the
  // Manager's touchEvent
  class SpecialButtonField extends ButtonField {
      public SpecialButtonField(String label) {
          super(label);
      }
      protected boolean navigationClick( int status, int time ) {
          onClick();
          return true;
      }
      public void onClick() {
          Status.show("Clicked: " + Integer.toString(_listField.getSelectedIndex()));
      }
  
  }
  
  }
  

• Added clear button

  Hello
  
  I saw this post by John Minkjan, http://obiee101.blogspot.com/2008/08/obiee-making-clear-button.html on how to add a 'clear' button to your dashboard. I was hoping to go a step further and do so that every time a "Go" button is created, is a button 'clear '. But I'm having a little trouble.
  
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