questions ListField

Similar Questions

• more UI questions. Custom LabelField and ListField text positioning

  Hello

  I have two questions.

  1. I implement a LabelField, and I want to be the width of the screen and the text to be in the middle of its width. I am implemented with these bits of style: DrawStyle.HCENTER | DrawStyle.VCENTER | Field.FOCUSABLE | Field.FIELD_HCENTER. Then I overload layout() with this:

  public void layout(int width, int height) {
                  super.layout(width, height);
                  setExtent(Display.getWidth(), this.getPreferredHeight());
              }
  

  The result is that the width of the field extends across the width of the screen, but the text is left-aligned. What I am doing wrong?

  2. I've implemented a ListField personalized with a custom drawListRow(). For some reason, the color of the text in the highlighted line remains black. I don't know what I did wrong. I was expecting that there the default highlight a behavior, which is thoroughly blue, white text.

  Thank you

          public int moveFocus(int amount, int status, int time) {
              _listField.invalidate(getSelectedIndex());
              return super.moveFocus(amount,status,time);
          }
  
          //Invoked when this field receives the focus.
          public void onFocus(int direction) {
              super.onFocus(direction);
          }
  
          //Invoked when a field loses the focus.
          public void onUnfocus() {
              super.onUnfocus();
              _listField.invalidate(getSelectedIndex());
          }
  

  In my ListFields sexy do Paint (usually different color according to the status background), I use a substituted ListField that invalidates whenever he thinks he needs to, the idea being that it forces the line to be redrawn.

  I'm not confident in them, but they do not seem to work.  It's code that I created when I started it first, I didn't need to change so I don't have, but I'd be very confident that it is not optimal.

  OK, so you know this code comes with no warranty.

  I have replaced three routines as follows:

• question of ListField remove the last element

  Hi all!

  Is there a known problem in ListField which explains the revival of an OutOfboundException when removing an element from a list with a single element?

  When you use listField.delete () I get this exception when the screen tries to set the focus.

  Thank you for your response. I finally solved the problem in my case using the substitution of "isFocusable" you describe here.

  While the default empty string is not the best solution for me display information when the list does not contain any element, I implemented the my own specific logic with a custom LabelField displayed instead of the ListField.

• ListField highlighter in 5.0 OS question

  Hello

  I create a listfield to draw a menu screen. Each line has a picture and on highlightiing another picture needs to be shown.

  I've commented the code in drawFocus () and drawListRow() I tried if (selectedindex == getcurrentIndex & listfield.isFocus) {image drawHighlighter}

  another match tie without highlighter.

  This code works perfectly in OS 6.0 Bt when I try in 5.0 that the hightlighter is not displayed.

  Then I tried if (g.isDrawingStyleSet (Graphics.DRAWSTYLE_FOCUS)) uncommented super.drawFocus. Then the problwem is the blue highlighter is also illustrated with highlighter in the list. How to solve this problem. There is no work around for this?

  This code should work:

  If (SelectedIndex == listfieldgetSelectedIndex () & listfield.isFocus ())...

  However, I think that I had problems with this part of the test:

  listfield.isFocus)

  and I ended up substituting onFocus and onUnfocus to set a flag tested myself.

  Check so that two parts of your so, statement actually cause the drawListRow bypass the Highlighter and let us know.

• Question about ellipsis in ListField

  Hi all

  I have a ListField with a custom reminder.  My lines are ouptutted in the following format:

  --------------------------------------------------------------

  | Pic Pic right text left text |

  --------------------------------------------------------------

  I had available work without any problem.  My problem is the following:

  Sometimes, the value assigned to the 'left' text will be really long - if long as it hinders the space used by "Right text" and "Pic".  In this case, I want to show an ellipse (using Graphics.ELLIPSIS in the drawText()).  However, the points of suspension does not appear.  I guess that's because it has not reached the end of the screen.  Is it possible to put things up so that the selection button will appear once it hits the position of "right text"?

  Thank you

  You probably use the short version of drawText in your drawListRow. net.rim.device.api.ui.Graphics has several drawText methods - choose those with the width argument.

  This could be what you need:

  drawText(String aText, int aX, int aY, int aFlags, int aWidth)

  Go DrawStyle.ELLIPSIS aFlags and width desired in aWidth.

• Question of ListField

  Hello

  I created a populatuing of a vector ListField.

  The line draw well, but the next line line drawa just one image but not the rest of the text.

  I checked vector and data receive very well to the (drawList).

  any idea, what happens?

  private class ListCallback implements ListFieldCallback
      {
          public void drawListRow(ListField list, Graphics g, int index, int y, int w)
          { 
  
              /*// focuss color
  
              if(list.getSelectedIndex() == index)
              {
                   g.setColor(0xffffff);
                   g.fillRect(0,(index*list.getRowHeight()),list.getWidth(),list.getRowHeight());
                   g.setColor(0x000000);
              }*/
  
              String RING="R:";
              String SIZE="X:";
              String LENGTH ="Y:";
              String FLAVOR ="Z:";
  
              Dummy item = (Dummy)_listElements.elementAt(index);// get the data to populate the 
  
              Bitmap photo= Bitmap.getBitmapResource(item.getPhoto());
  
              g.drawBitmap(10, y, photo.getWidth(),photo.getHeight(),photo, 0, 0);// draw the first photo
  
               int photoHeight = photo.getHeight();
  
               y= photoHeight+10;// now y will be this
  
              Font regularFont = list.getFont(); // save the regular font for future use
              Font boldFont = regularFont.derive(Font.BOLD);// derive the bold font
  
              g.setFont(boldFont);// set our pen to bold for while
  
              g.drawText(item.getFullName(), 0, y, 0, w); 
  
              g.setFont(regularFont);// back to norrmal pen
  
              int newY = y+ boldFont.getHeight();// get the new height to start drawing
  
               g.drawText(R+item.getR(), 0, newY+10, 0    , w); // draw the second line of text
  
               g.drawText(X+item.getX(),Font.getDefault().getAdvance(item.getR()+R)+10,newY+10,0,w);
  
               int newY2 = newY+regularFont.getHeight();// the third row draw staring point
  
               g.drawText(Y+item.getY(), 0, newY2+10, 0   , w); // draw the third line of text
               g.drawText(Z+item.getZ(),Font.getDefault().getAdvance(item.getY()+Y)+10,newY2+10,0,w);// third line right text
  
              // draw a line
              g.drawLine(0, y + list.getRowHeight() - 10, Display.getWidth(), y + list.getRowHeight() - 1);
          }
  

  Hi peter,.

  I found the error

  y = photoHeight + 10; / / now there will be this

  I changed on line t

  int y1 y + photoHeight + 10; / / y1 will now be what

  and following s all 'y' to 'y1 '.

  Apart FRO

  g.drawLine (0, y + list.getRowHeight () - 1, Display.getWidth (), y + list.getRowHeight () - 1); / / This remains the same, the value is 'y' not 'y1 '.

  Now all the good ones: Angel

  Thanks peter for your support, it was reallly help me to get my head around

  Cheer

• ListField question - default update

  When I view a listfield, how can I preset focus to a favorite item?

  For example, I got 6 items in a list field, when the display, I would like to underline or put the current cursor on the 3rd.

  Thank you.

  LAN

  ListField.setSelectedIndex (3)?

• ListField with checkboxes associated example question

  I use the code example...

  http://www.BlackBerry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800345/...

  in this perticular example I want to get the index of the selected how boxes can I do...?

  Kaddy

  getSelectedIndex returns only the index selected in the ListField, in this case, the ListField displays a special flag to indicate the selected items and this is what is needed.

  Given that this "checkbox" display using the code user in the drawListRow routine, the field itself has no idea of which have been verified and who did not.  Actually the same treatment that is used to detect if the box is checked should be used in the calling to detect program that have been checked.

  In this example, the data to be displayed are from the _listData and are a series of objects ChecklistData.  If the treatment must iterate over objects in listData, throw these ChecklistData objects and then use isChecked() against each object.

• ListField question?

  Hello
  I want to draw several bitmap images on the same line of the ListField component. I wonder can I put Layout Manager in the ListField, because I don't want to define absolute coordinates.
  This is my code:

  public void drawListRow(ListField list, Graphics g, int index, int y, int w) {
          if(index == 0) {
              g.drawText("Group 1", 0, 25, DrawStyle.ELLIPSIS, 70);
              g.drawBitmap(80, 0, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(170, 0, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(260, 0, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
          } else if(index == 1) {
              g.drawText("Group 2", 0, 75, DrawStyle.ELLIPSIS, 70);
              g.drawBitmap(80, 50, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(170, 50, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(260, 50, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
          } else if(index == 2) {
              g.drawText("Group 3", 0, 125, DrawStyle.ELLIPSIS, 70);
              g.drawBitmap(80, 100, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(170, 100, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
              g.drawBitmap(260, 100, 48, 48, Bitmap.getBitmapResource("red.png"), 0, 0);
          }
  }
  

  Best regards.

  Yes I did the same thing a long time back.

  I did a ListFieldManager extends ListField. Then, inside of the done inside that class horizontalfields extends HorizontalManager.And Customize the SubLayout() of HorizontalFields and setPositionChild THE Bitmap field in SubLayout(). And add these instance BitmapField in HorizontalFields constructor.

  I hope that you have some idea of Basic...

• Question for ListField

  Hello

  Can I have a ListField or table with text boxes and labels placed in each line of the list?

  Help, please...

  Thanks in advance...

  Visit this link for the code example:

  View a list of complex documents

• ListField background color / highlight

  I am creating a ListField with a red background and white text at any time accept for when highlighted.  When highlighted I would like to highlight to change to color pink (text remains black).  In the following code, the background color is still red, however, the highlight is never fired.

  Question = new ListField()
  {

  Boolean _inFocus;

  protected void onFocus (int direction)
  {
  super.onFocus (branch);
  _inFocus = true;
  Super.Invalidate ();
  }

  protected void onUnfocus()
  {
  super.onUnfocus ();
  _inFocus = false;
  Super.Invalidate ();
  }
     
  public void paint (Graphics g)
  {
  g.setBackgroundColor (Color.RED);
  g.setColor (Color.BLACK);
  Super.Paint (g);

  If (_inFocus)
  {
  g.Clear ();
  g.setBackgroundColor (Color.RED);
  Super.Paint (g);
  }
  on the other
  {
  g.Clear ();
  g.setBackgroundColor (Color.PINK;
  Super.Paint (g);
  }
  g.setBackgroundColor (Color.PINK);
  }
  };

  If I remove the line g.setBackgroundColor (Color.RED); the work of highlighting (rose) and the text remains black, the background color of the listfield however goes to white.  Am I miggins something logic here?  Appreciate any comment.  Thank you.

  Kile

  There is a great knowledge base article ListField coloring:

  Create a color ListField

  Study the code and be creative .

  Good luck!

• Touch anywhere on the screen calls the ListField TouchEvent.DOWN

  Hello

  I suffer with small complex issue. In the screen of my application, I have the title bar with a labelfield and two custom buttons.

  Below the titlefield I add a list field.

  Now, I have a few complex features on the field from the list. When I click each line in the list, it should move to another screen I do using navigation, click medium. Now if I touch the rank in the list (for touch devices), it should move to another screen. And if I touch along the line of the list, it will display popup menu (custom, not by default) with option of removal and details.

          mListItem = new ListField(length, ButtonField.CONSUME_CLICK)
          {
              long touchedAt = -1;
              long HOLD_TIME = 500;
  
           // The regular getFieldAtLocation returns wrong values in open
                      // spaces in
                      // complex managers, so we override it
  //                  public int getFieldAtLocation(int x, int y) {
  //                      XYRect rect = new XYRect();
  //                      int index = getFieldCount() - 1;
  //                      while (index >= 0) {
  //                          getField(index).getExtent(rect);
  //                          if (rect.contains(x, y))
  //                              break;
  //                          --index;
  //                      }
  //                      return index;
  //                  }
              protected boolean navigationClick(int status, int time)
              {
                  // Click related functionality
                  return true;
              }
  
              protected boolean touchEvent(TouchEvent message)
              {
                  if(message.getEvent() == TouchEvent.DOWN)
                  {
                       if (getFieldAtLocation(message.getX(1), message.getY(1)) == -1)
                       {
                           Logger.out("AccountList", "Touch down: getField location");
                           return true; // kill the event
                       }
                       else
                       {
                           touchedAt = System.currentTimeMillis();
                           touchedonList = true;
                           Logger.out("AccountList", "Touch down: touched down  "+touchedonList);
                       }
                  }
                  else if(message.getEvent() == TouchEvent.UP )
                  {
  
                         if(System.currentTimeMillis() - touchedAt < HOLD_TIME && touchedonList == true)
                         {
                             touchedAt = -1; // reset
                             // Single Touch and Move to another screen
                         }
  
                         else if(touchedonList == true)
                         {
                           // Showing Menu Popup
                         }
                  }
                  return true;
  //              return super.touchEvent(message);  // Not using this as it will show the default pop up
              }
  

  And here's my reminder list field:

  public class ListCallBack implements ListFieldCallback
      {
          public void drawListRow(ListField listField, Graphics graphics, int index,
                  int y, int width) {
  
              String strdomOrg = yyyyyyy;
              String text = xxxxxx;
              Font f = FONT_FAMILY_0_SF_AS_08;
  
              int h = f.getHeight();
  //          int height = (listField.getRowHeight() - h)/2 ;
              int height = h/2 ;
              y += height;
              graphics.setFont(f);
              graphics.setColor(Color.BLACK);
              graphics.drawText(strdomOrg, 10, y, DrawStyle.ELLIPSIS, width);
              y = y + h;
              graphics.setFont(FONT_FAMILY_1_SF_AS_08);
              graphics.setColor(Color.BLACK);
              graphics.drawText(text, 10, y, DrawStyle.ELLIPSIS , width);
  
           // use the offset instead
              int offset = (listField.getRowHeight() ) >> 1;
              if (index != 0) {
                  graphics.drawLine(0, y - offset , width, y - offset);
              }
          }
  
          public Object get(ListField listField, int index) {
              // TODO Auto-generated method stub
              return mAccounts[index];
          }
  
          public int getPreferredWidth(ListField listField) {
              // TODO Auto-generated method stub
              return screenWidth;
          }
  
          public int getPreferredHeight() {
              return getContentHeight();
          }
  
          public int indexOfList(ListField listField, String prefix, int start) {
              // TODO Auto-generated method stub
              return listField.getSelectedIndex();
          }
  
      }
  

  Now the question is to come a different way:

  1. whenever I touch the buttons in title field, he calls the listfield TouchEvent.DOWN. Then the click of a button does not work. Instead, by clicking on the title bar, it moves to another screen, which is the feature click list filed.

  2. so I added the listfield at a value for money. :

  m_vfmScreen = new VerticalFieldManager(VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR)
          {
  
          protected boolean touchEvent(TouchEvent message) {
                  int event = message.getEvent();
                  if (event == TouchEvent.CLICK) {
                      if (getFieldAtLocation(message.getX(1), message.getY(1)) == -1)
                          return true; // kill the event
                      else {
                      }
                  }
                  return super.touchEvent(message);
              }
  
              // The regular getFieldAtLocation returns wrong values in open
              // spaces in
              // complex managers, so we override it
              public int getFieldAtLocation(int x, int y) {
                  XYRect rect = new XYRect();
                  int index = getFieldCount() - 1;
                  while (index >= 0) {
                      getField(index).getExtent(rect);
                      if (rect.contains(x, y))
                          break;
                      --index;
                  }
                  return index;
              }
          };
  

  While in the list key of field works. If I touch the buttons in the title bar, it does not. But if the keys become focus, this case they work.

  So I am in dilemma, what exactly the problem. Can someone please help.

  For me, there's a code unepxected in your touchEvent() - getFieldAtLocation().  If you want released supporess presses of field, I suggest you use code like this:

  protected boolean touchEvent (TouchEvent message) {}

  int x = message.getX (1);
  int y = message.getY (1);
  If (x < 0="" ||="" y=""> < 0="" ||="" x=""> getExtent () .width: y > getExtent () .height) {}
  Outside the scope
  Returns false;
  }

• ListField selected?

  How do I know if an item is selected in a ListField? The documentation says that getSelectedIndex returns-1 if an item is not selected, but when I fill my list then check if on is selected, the following code always runs if the list contains elements.

  If (editList.getSelectedIndex () >-1) {}

  }

  When I check the value of getSelectedIndex(), it is 0 if there is no selected item, or if the first element is selected and something greater than 0 if the other items are selected. So, what is a reliable way to only do something if an item is selected in the list.

  also, really dumb question, how you define MultiSelect on a ListField?  I wonder maybe if I need that goes out to make this work as I want to and the docs don't tell how to use the fields.

  It seems that the documentation is confusing, as the ListField will return the index of the last selected element.  Take a look at this thread - you can use 'getLeafFieldWithFocus()' to determine the currently selected field and if it is not centered, assumes that the index is - 1.

  See this thread:

  Problem with the ObjectListField

  http://supportforums.BlackBerry.com/Rim/Board/message?board.ID=java_dev&message.ID=26369

  You use MULTI_SELECT in the style of the constructor - see setting

  Public ListField (int numRows, long style)...

• The remote XML parsing and ListField implementation

  I use Blackberry 9800 Simulator, JRE 6.0.0

  Hello

  I have a remote XML I want to analyze, but for some reason, my ListField shows only 1 row. I tried debugging and saw the number of attributes my vector, which is significantly greater than 1.

  Here is my code: http://pastebin.com/zRDW2xfn

  I'm doing something wrong?

  In addition, in the ListFieldCallback, the drawListRow index does not increment...

  Hey there,

  I found the problem, if you print the exception, you will see what is wrong. Basically, you dodnt have access to the UI within this thread.

  I changed the class connectionthread for you below.

  private class Connection extends Thread{
  
          public String title;
          public int i=0;
  
          public Connection(){
              super();
          }
  
          public void run(){
              // define variables later used for parsing
              Document doc;
              StreamConnection conn;
              try{
                  conn = (StreamConnection)Connector.open("http://tpae.me/events.xml;deviceside=true");
                  DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
                  DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
                  docBuilder.isValidating();
                  doc = docBuilder.parse(conn.openInputStream());
                  doc.getDocumentElement().normalize();
                  NodeList list = doc.getElementsByTagName("Event");
  
                  for (i=0;i
  Note: the fix is not optimal, but his show you how it should be done.
  Please let me know if you still have problems or questions.
  		   

• Limit scrolling ListField

  I have two screens with same ListField code.

  When the ListField gets Focus, it selects the last item in the list. Then you can scroll vertically. When you scroll over the bottom buttons to resume the focus at the bottom of the screen.

  On one screen, it works perfectly. When you scroll to the top, he remains on the first point. When you scroll down, it scrolls down and buttons to resume the focus.

  On the other hand (using the same code), it scrolls on the top of the list and loses focus. When you scroll to the bottom, he returned to focus on the last item in the list.

  How can I prevent the ListField loses focus when you scroll past top?

  I fought it for a while. Any help will be appreciated.

  The code is very basic and as follows:

  logList = new ListField(){
      public void onFocus(int direction) {
          setSelectedIndex(this.getSize());
      }
      public boolean keyChar( char key, int status, int time ) {
          return false;
      }
  };
  ListCallback _callback = new ListCallback();
  logList.setCallback((ListFieldCallback) _callback);
  logList.setFont(fontLog);
  logList.setRowHeight(fontLog.getHeight()); 
  
  ...
  
  fmLog   = new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL);
  fmLog.add(logList);
  mainManager.add(fmLog);
  
  ...
  
  private void reloadList() {
      logList.setSize(logListElements.size());
      fmLog.setVerticalScroll(Math.max(0, fmLog.getVirtualHeight() - fmLog.getVisibleHeight()));
  }
  
  ...
  
  public class ListCallback implements ListFieldCallback  {
      private int listWidth;
  
      public void drawListRow(ListField list, Graphics g, int index, int y, int w) {
          ...
      }
      public Object get(ListField list, int index) {
          return logListElements.elementAt(index);
      }
      public int indexOfList(ListField list, String prefix, int string) {
          return logListElements.indexOf(prefix, string);
      }
      public int getPreferredWidth(ListField list) {
          return displayWidth;
      }
  }
  

  ! @# $ NullField()...

  You never see these things until after the question...