Scrolling ListField

Similar 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...

• ListField Scrolling - please help!

  I have read many comments scrolling ListField and I have

  a hard time!

  Trying to get the scroll for a ListField. It is in a VerticalFieldManager.

  The ListField is the contents of a table like structure. The BitmapFields

  on the left you see below, are a different Manager.

  The manager that contains a scrolling VerticalFieldManager

  and scroll to the WIDE bars.

  Start photo:

  

  NOTE the arrow the down scroll bar here, no arrow (?). But I'm at the top of the list, I want to scroll to the top to see the bottom. There are 30 entries in this list. This is a problem.

  After scrolling:

  

  I do not understand why scrolling results in the image above.

  Where is my top scroll bar arrow?

  In addition, after scrolling once, I lose the arrow of the scroll bar.

  Ideas?

  Here's the drawRow in my ListView:

  I realized what was going on.

  Field.getExtent () does not return a copy of the rectangle of the measurement field - but the rectangle extent itself.

  So, if you have

  XYRect r = this.getExtent ();

  r.x += factor;

  Then your field will be repainted in the wrong place. It will be a wrong x.

  I think it is a bug or bad design, because this measure rectangle should be wrapped.

  You cannot modify it via the interface of the method, you should not be able to change this way.

  getExtent() should return a copy of this rectangle, in my opinion.

  So I was something with measurement values, calculation without realizing that I was changing the coordinates of the field.

  My ListField wasn't all scrolling. It has simply been moved downwards.

  Unfortunately, it still does not scroll.

  lucidbee.

• ListField scroll jumps in OS 6

  Has anyone noticed that scrolling ListField tends to jump around in an unexpected way in OS6? It looks good in all the other versions.

  Any ideas?

  I thought about it. It had to do with the focus on the last item layout to force scrolling to the bottom of the list. OS6 didn't like it...

  I changed it to:

  private void reloadList() {
          logList.setSize(MyApplication.logListElements.size());
          fmLog.setVerticalScroll(Math.max(0, fmLog.getVirtualHeight() - fmLog.getVisibleHeight()));
  }
  

• ListField: why complexity?

  Hello everyone.

  I'm trying to do something that should be very simple.  I'm doing a ListField, filling and drawing, which was not a simple task.  Now, I'm doing a row of buttons at the bottom of the ListField so that I can load or remove the selected menu item.

  I want the list to occupy the top of the page 300 pixels of the screen and scrolling in the 300 pixels, and I want the buttons to raise the low 60 pixels (locked in landscape mode).

  I tried a bunch of things:

  -paint using graphics.fillRectangle buttons, etc. and catch the touchEvent, but when the list scrolls buttons not painted at the bottom of the screen, they scroll up with the list?

  -make a child class of ListField that redraws the buttons at the bottom of the screen on drawFocus and paint, also sets the preferred height of 300px.  There is nothing to help the situation

  ANY help would be appreciated!  Thanks in advance guys!

  -paul

  I suggest you add your buttons in the status area on your screen (setStatus()).

  The trick here is that you are trying to achieve with fields, you should really use managers to do.  If you need to add your ListField to a manager who is always 300 pixels high (you can use the sublayout method to impose the operation), and let the scrolling ListField statement.  Then you must create a high 60 Manager that you add after the 300 high Manager and you add buttons to it.

  However just add your buttons to a HorizontalFieldManager and adding then the HFM to the status area should do it for you also.

  Give it a go and let us know.

• ListField setListSelection() problem of drawing

  Hi all, I'm new in the development of bb and I will try to create a ListField class to manage ListField and ListFieldCallBack design, but I have a problem with ListField SetSelectedIndex (Position), because ListFieldCallBack does not "drawListRow" (don't shoot list lines) and ListField seems to be empty, it restarts to draw only when users scroll ListField control.
  I don't really know how to resolve or work around this problem...
  I try with RIM Jde 5.0.0 and BB Storm 9550

  Application - start
  Grid VediOrdini = new Grid();
  VediOrdini.Inizialize ("Select CodCli, CodLinea, coding of AgeLinea", Gv.Db, this);
  VediOrdini.AddColumnPerc (0, "CodCli", "L", 40);
  VediOrdini.AddColumnPerc (1, "CodLinea", 30, "C");
  VediOrdini.AddColumnPerc (2, "Coding", 30, "R");
  VediOrdini.Draw ();
  VediOrdini.SetSelectedIndex (350);

  -Draw() class ListField
  MiaLista = new ListField(); Lista oggetto Dichiaro
  MiaLista.setRowHeight (RowHeight); Transamissões is delle lines
  MiaCallBack = new TestListCallback(); Reminder it derivo by manage the list
  MiaLista.setCallback (MiaCallBack); E lo transamissões sulla mia lista
  RowSelected = - 1; Inizializzo he number di riga per poterlo manage poi selezionata e tornare in caso di GetSelectedIdex
  Line r;
  int i = 0;
  {while (DataReader.Next ())}
  r = DataReader.getRow (); Ciclo he mio "DataReader".
  MiaLista.insert (i); Will di volta in volta una riga alla lista
  By mi ogni Riga del datareader i campi della riga in one Salvo ' oggetto line
  Lines MiaRiga = New Rows (Colonna.size (), r);
  Riga.addElement (MiaRiga);

  i ++ ;
  }
  MyVFieldManager VFieldManager = new MyVFieldManager (Manager.VERTICAL_SCROLL, ListWidth, ListHeight);
  VFieldManager.add (MiaLista); Gli bell'attacco E degli articles list
  SC. Add (VFieldManager); Lo will went form

  -SetSelectedIndex (Posizione) class ListField
  MiaLista.setFocus ();
  MiaLista.setSelectedIndex (Posizione);
  Manager manager = MiaLista.getManager ();
  manager.setVerticalScroll (Posizione * RowHeight);
  MiaLista.invalidateRange (Posizione, (Posizione + RowPage));

  Can someone help me please?
  Thanks in advance

  I've seen problems such as too, where the setSelectedIndex must run on the event Thread.

  The best thing to do is some code to be run in this way and use "invokeLater" package.  I actually do sometimes even when I'm on the edge of events, because I want to change to take place later.

  Then put the setSelectedIndex and everything you think you need to do, in one of them:

  UiApplication.getUiApplication () .invokeLater (new Runnable() {}

  public void run() {}

  here

  {

  {);

• How to display the scroll bar on the listField

  I use the following code to add a listField to VerticalManager, but he couldn't display a vertical scroll bar.

  Thanks for any help.

  Michael

  SerializableAttribute public class ContactsListField extends VerticalFieldManager
  {

  .......

  public ContactsListField (int width, int height, string keyword)
  {
  Super(Manager.NO_VERTICAL_SCROLL |) Manager.FIELD_HCENTER);
          
  managerWidth = width;
  managerHeight = height;
  VerticalFieldManager vor = new VerticalFieldManager(Manager.VERTICAL_SCROLL |)
  Manager.VERTICAL_SCROLLBAR | Manager.FIELD_HCENTER | Manager.FIELD_VCENTER);
          
  listField = new ListField(0,ListField.FOCUSABLE)
  {
  public void paint (Graphics g)
  {
  getManager () .invalidate ();
  Super.Paint (g);
  }
  };
          
  listCallback = new ListCallback();
  listField.setCallback (listCallback);
          
  contacts = getData();
  If (contacts! = null)
  filterKeyword (keyword);
                      
  VFM. Add (ListField);
  Add (VFM);
  }

  Hmm... nothing extraordinary.  One might want to draw focus in the ListField by defining a suitable background and foreground colors, but still - there is nothing that would prevent the drawing of the ScrollBar by the Manager.  Of course, Manager.FIELD_VCENTER is not used in the optimization of resources, and I suspect that FIELD_HCENTER will be useless too (I think ListField uses all of the default width).  You can delete these two style bits.

  One thing to check - what can you add that ContactListField to?  If it's a screen or a derived class, you must use NO_VERTICAL_SCROLL in the constructor.  In this way, you will ensure that is vfm that manages the painting "scrollbar".

• bitmap image clears I scroll in the listfield and not repainted

  Hi all

  I try to use a single bitmap for the listfield, who owns 10 list (for example). I am just placing bitmap b4 but it erases just the user scrolls and don't then repainted. Please help me find the solution.

  public MyCallback()
      {
          dest = new XYRect(5,5,20,20);
          bitmap = Bitmap.getBitmapResource("icon_select.png");
      }
  
      public void drawListRow(ListField listField, Graphics graphics, int index,
              int y, int width)
      {
          String text = (String) list.elementAt(index);
          dest.y+=15;
          graphics.drawBitmap(dest, bitmap, 0, 0);
          graphics.drawText(text,25, y+3,0,width);
      }
  

  also how to make this bitmap appears as it is b4 every name I.

  

  This is b4 scrolling. and after scrolling it looks like.

  

  Please help me find the solution

  average u when focus you and unfocus the individual line.

  If it's problem so look for drawFocus, u can try calling inavalidate inside...

  can u post a larger excerpt

• ListField in image sets without scrolling Page

  What I'm trying to do, it's like what Poynt done with their results, where the ListField scrolls, but around it stays the same. All I have is a listfield on a screen, but I have a bitmap as a background and would like to keep it fixed while only the listfield scrolls

  Someone has an idea how Poynt did it?

  Hello

  Take a look at this thread

  http://supportforums.BlackBerry.com/Rim/Board/message?board.ID=java_dev&message.ID=30432#M30432

• ListField (s) nested in VerticalFieldManager-> SWIPE/SCROLL with HorizontalFieldManager

  I have 2 ListField objects. Each within its own VerticalFieldManager object. 2 VFMs are inside a HorizontalFieldManager object. I am trying to allow the user to BLOW/scrolling of one ListField to another (LEFT/RIGHT). I did not have the TouchEvent portion this again (I guess I'll have to put in place something there).

  Here's what I have so far... However, only the first ListField shows with data (random numbers right now). The other is empty. I also want to allow the user to select individual lines in each ListField

  All the suggestions/help is appreciated.

  See you soon,.

  public final class MyScreen extends MainScreen {
  
      public MyScreen() {
          super(MyScreen.NO_VERTICAL_SCROLL);
          Random rand = new Random();
          HorizontalFieldManager hm = new HorizontalFieldManager(HorizontalFieldManager.HORIZONTAL_SCROLL);
          Vector v1 = new Vector();
          Vector v2 = new Vector();
          for (int i = 0; i < 10; i++) {
              v1.addElement(Integer.toString(rand.nextInt(200)));
              v2.addElement(Integer.toString(rand.nextInt(300)));
          }
          hm.add(new ListManager(v1, "VM lf1"));
          hm.add(new ListManager(v2, "VM lf2"));
          add(hm);
  
          // Set the displayed title of the screen
          setTitle("MyTitle");
  
      }
  
      class ListManager extends VerticalFieldManager {
          private Vector _elements;
          ListField _lf;
  
          ListManager(Vector elements, String title) {
              super(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR);
              _lf = new ListField();
              _lf.setCallback(new ListCallback());
              this._elements = elements;
              add(new RichTextField(title));
              add(_lf);
              updateList();
          }
  
          private class ListCallback implements ListFieldCallback {
  
              public void drawListRow(ListField list, Graphics g, int index, int y, int w) {
                  g.setColor(Color.BLACK);
                  String text = (String) _elements.elementAt(index);
                  g.drawText(text, 5, y, 0, w);
              }
  
              public Object get(ListField list, int index) {
                  return _elements.elementAt(index);
              }
  
              public int indexOfList(ListField list, String p, int s) {
                  return _elements.indexOf(p, s);
              }
  
              public int getPreferredWidth(ListField list) {
                  return Display.getWidth();
              }
          }
  
          protected void sublayout(int width, int height) {
              super.sublayout(width, height);
  
              setExtent(width, height);
          }
  
          private void updateList() {
              _lf.setSize(_elements.size());
          }
  
      }
  }
  

  The two lists show up... However, the halves just in the same HM. My goal is to have everyone take full screen (visible at the time) only... then the user has to SWIPE (from EAST to WEST) to see the list of the other.

  So I changed the following line

  super.sublayout(Display.getWidth(), height);
  

  Thanks Peter

• ListField does not scroll in the storm

  Hello

  I use the simulator of the storm.

  I have a ListField inside a VerticalFieldManager in a VERTICAL_SCROLL and VERTICAL_SCROLLBAR style.

  I can move the list down with keyboard arrows down or the field list does not scroll to the top, but when I try to use the key (right key) in the Simulator.

  Looks like I'm missing something, please help.

  Thank you

  Thanks for the help.  But I thought about it.  Missed me the call to the call of super.touchEvent (event)...  So now, I handle the case else if is not a click, then I call the return super.touchEvent (event);

• Cannot get the scroll bars to view on popupscreen listField

  Hello world.

  I'm developing a popup for the 9530 screen application that has only a listField on the pop-up screen. However, I do not

  the scroll bars on my listField. Here is a snippet of my code:

  SerializableAttribute public class PasswordPopupScreen extends PopupScreen {}
  public PasswordPopupScreen() {}
  Super (new VerticalFieldManager (VERTICAL_SCROLLBAR), DEFAULT_MENU |) DEFAULT_CLOSE);
  HFM HorizontalFieldManager = new HorizontalFieldManager(Manager.VERTICAL_SCROLL |)                                            Manager.NO_HORIZONTAL_SCROLLBAR);

  MyListField myList = new MyListField(0,ListField.FIELD_VCENTER);
  ...

  ...

  HFM. Add (myList);
  Add (HFM);

  }

  ...

  ...
  So do / can a listField even display a vertical scroll bar on a popupscreen? I don't know that I need a manager of vertical and horizontal. All that my screen will have on it is a listField and perhaps a title.

  If anyone can point me in the right direction for what is missing which is originally a vertical scroll bar does not show?

  Thank you.

  Ok. I got it work. My Simulator crashed then I reinstalled it and it worked only. Strange. Well...

  Thank you.

• Scrolling AND selecting items in a ListField on the storm?

  Background information:

  BlackBerry Storm 9500

  BlackBerry JDE 4.7.0

  Problem:

  I use a ListField to display several items in a list. I also use the touchEvent (TouchEvent message) method to listen to a click (TouchEvent.CLICK). Well, everything seems to work except when I need to scroll through the list. It seems that using the touchEvent method, I can't scroll through the list. If I remove the touchEvent method, scrolling works but I am unable to use the touch interface to select an item in the list by clicking on it.

  Question:

  Is it possible to get both? In other words, can enable scrolling in the ListField AND allow the user to select an item by clicking on it?

  Code:

  private class SlideList extends screen

  {

  Fields

  private ListField _list;

  Private _callback ListCallback;

  Constructor

  public SlideList()

  {

  Super();

  Add a title screen

  LabelField title = new LabelField (getTitle (), LabelField.ELLIPSIS |) LabelField.USE_ALL_WIDTH);

  setTitle (title);

  setupList();

  }

  Private Sub setupList()

  {

  If (_list! = null)

  Delete (_list);

  Get all the slides and put their titles and subtitles in a table

  String [] slideTitles = getSlideTitles();

  _list = new ListField();

  _callback = new ListCallback();

  _list.setCallback (_callback);

  Build the list of exercise.

  for (int index = 0; index)

  {

  _list. Insert (index);

  _callback. Insert (slideTitles [index], index);

  }

  _list.setSelectedIndex (currentSlideNum);

  Add (_list);

  }

  Get the touch input.

  protected boolean touchEvent (TouchEvent message)

  {

  If (message.getEvent () is TouchEvent.CLICK)

  {

  Check if a list item is selected.

  If (_list.getSelectedIndex () > - 1).

  {

  Dialog.Alert ("you selected:" + _list.getSelectedIndex ());

  itemSelected (_list.getSelectedIndex ());

  Returns true;

  }

  on the other

  Returns false;

  }

  on the other

  Returns false;

  }

  Private Sub itemSelected (int listIndex)

  {

  currentSlideNum = listIndex;

  displaySlide();

  UiApplication.getUiApplication () .popScreen (this);     Remove this screen to display the program.

  }

  private class ListCallback implements {ListFieldCallback}

  private vector listElements = new Vector();

  ' public void drawListRow (list ListField, Graphics g, int index, int y, int w)

  {

  String text = (String) listElements.elementAt (index);

  g.drawText (text, slideIcons [index] .getWidth () + 10, y, 0, w);

  }

  public Object get (ListField list, int index) {}

  Return listElements.elementAt (index);

  }

  public int indexOfList (String p, ListField list, int s) {}

  Return listElements.getSelectedIndex ();

  Return listElements.indexOf (p, s);

  }

  public int getPreferredWidth (ListField list) {}

  Display sr = UiApplication.getUiApplication () .getActiveScreen ();

  Return sr.getWidth ();

  }

  public final void insert (String toInsert, int index) {}

  listElements.insertElementAt (toInsert, index);

  }

  {} public void erase()

  listElements.removeAllElements ();

  }

  }

  }

  Mark,

  Thanks for your reply. It turns out that the solution I was looking for was very simple. Rather than return

  fake

  in the touchEvent method, I back

  super.touchEvent (message)

  While touchEvent can call its parent class and always look for other events inherent in a listenField, such as scrolling with a finger.

  It now looks like this:

  Get the touch input.

  protected boolean touchEvent (TouchEvent message)

  {

  If (message.getEvent () is TouchEvent.CLICK)

  {

  Check if a list item is selected.

  If (_list.getSelectedIndex () > - 1).

  {

  Dialog.Alert ("you selected:" + _list.getSelectedIndex ());

  itemSelected (_list.getSelectedIndex ());

  Returns true;

  }

  }

  Return super.touchEvent (message);

  }

• TouchEvent in Listfield does not work after scrolling in the storm.

  Hello

  My problem is that I have a 250 size listfield, which I add to a verticalfieldmanager1, this verticalfieldmanager1 is added to an another verticalfieldmanager2, then verticalfieldmanager2 is added to horizontalfieldmanager then horizontalfieldmanager is added to the screen.

  By default, I have to display index 220 (to achieve this, I'll focus on the listfield), so when I key to select other items in the list it is not selecting (Touch event does not work). It is to select only the element that has focus.

  I am owner event touch listfield. Could someone please help me in this regard.

  Hello

  I am happy to share that I found a solution for the problem I had.

  Post here as it may help someone. I used the TouchEvent.getX () & TouchEvent.getY)

  directly which solved my problem, previously I was using () TouchEvent.getGlobalX & TouchEvent.getGlobalY ().

  Once again thank you.

• Move the focus from the listfiled to the particular label (horizontal scrolling problem)

  Hello

  In my application, I have some labels (which are focusable) at the top of the screen that I put in the manager (hfm_lbl) horizontal field with horizontal scrolling.

  After hfm_lbl, I have a listfiled.

  Now when I scroll to the top of the listfiled (i.e.from from bottom to top), the focus moves to top but sets the last menu of the hfm_lbl.

  I want the focus to specify the label of perticular.

  Any help is appreciated...

  Thank you...

  drawFocus won't help with this.

  The problem is only a HFM, when focus activates it by underneath, will automatically set the focus to the last item in the list.  Therefore, substitute this transformation.

  There are actually two options, depending on whether you want to override the onFocus method, or use a FocusChangeListener. I know that some people have had problems with the onFocus() substitution, so recommend the listener. But I never have, so after you will find a sample of the code that I use in this circumstance.

  The thing is that the treatment in the HFM should remember the lastFocusField (one of your labels) when the focus is moved there.  This challenge, I'll leave with you.  Still, he has a variety of options and not better.  So whatever you think probably will work fine.  One option is to set the HFM as a FocusChangeListener for all the domains that are added and then remember the last one, who won the point - then the treatment is autonomous in the HFM.

  The following codes assume that lastFocusField is a field in the HFM, one user had developed on before the ListField moved t.  This method overrides onFocus() in the HFM.

  protected void onFocus (int direction) {}
  super.onFocus (branch);
  If (direction! = 0 & lastFocusField! = null) {}
  UiApplication.getUiApplication () .invokeLater (new Runnable() {}
  public void run() {}
  lastFocusField.setFocus ();
  }
  });
  }
  }

  Edit: I think that Simon and I had to answer at the same time.  Just to say, in my experience in this case, you might be able to do it with moveFocus(), or navigationMovement(), but not as easily as onFocus().