I have the following problem:
My method opens a JDialog with a bunch of buttons (only one in example code). I want to click a button and thereby choose an ImageIcon for my method to return. But the Method does not wait for me to click a button. It opens the window and then returns an empty ImageIcon.
public class Kartenauswahl {
ImageIcon bandit;
public ImageIcon auswahlfenster() {
int bwidth = new Integer(150);
int bheight = new Integer(225);
bandit = new ImageIcon("cover/Bandit.jpe");
bandit.setImage(bandit.getImage().getScaledInstance(bwidth,bheight,Image.SCALE_DEFAULT));
final JDialog kartenwahl = new JDialog();
kartenwahl.setTitle("Kartenwahl");
kartenwahl.setSize(1500,1000);
kartenwahl.setVisible(true);
kartenwahl.setLayout(new FlowLayout());
ImageIcon returnicon= new ImageIcon();
final JButton b1 = new JButton(); //just to get the Icon out of the void loop
JButton B1 = new JButton(bandit); //this is going to be the button I want to click to choose the ImageIcon which is returned
B1.setContentAreaFilled(false);
B1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
b1.setIcon(bandit);
kartenwahl.dispose();
}
});
kartenwahl.add(B1);
returnicon = (ImageIcon) b1.getIcon();
return returnicon;
}
}
Question: can I bind the return statement to a condition? Like "only return after I clicked that Button B1"?
Hi sorry for the long wait. I have written an custom JDialog that should work for you.
public class CustomDialog extends JDialog {
JButton[] buttons;
ImageIcon selectedImageIcon;
public CustomDialog() {
setSize(500, 500);
setLayout(new GridLayout(4, 6));
ActionListener actionListener = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
selectedImageIcon = ((ImageIcon) ((JButton) e.getSource()).getIcon());
dispose();
}
};
buttons = new JButton[24];
for(int i = 0; i < 24; i++) {
buttons[i] = new JButton(new ImageIcon("path_to_your_image_file"));
buttons[i].addActionListener(actionListener);
add(buttons[i]);
}
setVisible(true);
}
public ImageIcon getSelectedImageIcon() {
return selectedImageIcon;
}
}
The initial size is not that important the GridLayout is. you mentioned that you would need 24 buttons so I created an grid with 4 rows and 6 columns.
Then I create the buttons in a loop and adding the same Listener to set the selection icon with the icon of the pressed button. Afterwards I dispose the screen triggering an windowClosed event.
You could simply create this Dialog from your main class and wait for the response like so:
public class main {
public static void main(String[] args) {
CustomDialog customDialog = new CustomDialog();
customDialog.addWindowListener(new WindowAdapter() {
#Override
public void windowClosed(WindowEvent e) {
ImageIcon icon = customDialog.getSelectedImageIcon();
//do something with your icon
}
});
}
}
Don't forget to mark this answer as correct if it fixes your problem.
Have a good one!
I have a very strange problem at the moment.
Basically when I scroll in a screen, the fields don't get redrawn completely or consistently.
I have a Screen (NO_VERTICAL_SCROLL), with a manager as a titlebar. Below that I have a vertical field manager (VERTICAL_SCROLL) with labelfields. When I scroll the vfm one or two lines of the labelfields, which were already visible, get redrawn. The section I'm scrolling down to has absolutely nothing drawn.
I tried invalidate(), and calling doPaint in a scrollchangelistener, but its actually much worse. It results in the titlebar only being partially redrawn.
In the code below I used a custom FontManager, DimenManager, and ImageResourceManager to return values dependent on screen size. I used a custom BitmapButtonField and ClickableLabel in order to change the state of a field when a click is being held in.
public class BaseScreen extends MainScreen implements StringsResource
{
protected ResourceBundle resources;
public BaseScreen(long style)
{
super(style);
StandardTitleBar titlebar = new StandardTitleBar();
titlebar.addSignalIndicator();
titlebar.addClock();
titlebar.addNotifications();
setTitle(titlebar);
resources = ResourceBundle.getBundle(BUNDLE_ID, BUNDLE_NAME);
}
}
public class TandCScreen extends BaseScreen
{
final String copy_text1 = "long text here";
final String copy_text2 = "even longer text here";
ColoredLabelField label_title;
ColoredLabelField label_subtitle;
ColoredLabelField label1;
ColoredLabelField label2;
ClickableLabel label3;
public TandCScreen()
{
super(NO_VERTICAL_SCROLL | NO_VERTICAL_SCROLLBAR);
label_title = new ColoredLabelField(resources.getString(STRING_APP_NAME), Color.WHITE, DrawStyle.HCENTER | USE_ALL_WIDTH);
label_title.setBackground(BackgroundFactory.createSolidBackground(0x60223b));
label_subtitle = new ColoredLabelField(resources.getString(STRING_TANDC_TITLE), 0x58585b, DrawStyle.HCENTER | USE_ALL_WIDTH);
label1 = new ColoredLabelField(copy_text1, 0x58585b, USE_ALL_WIDTH);
label2 = new ColoredLabelField("", 0xa7a9ab, USE_ALL_WIDTH);
label3 = new ClickableLabel("Read more...")
{
protected void unclick()
{
super.unclick();
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
ColoredLabelField label = new ColoredLabelField(copy_text2, 0xa7a9ab, 0);
label.setFont(FontManager.body());
label.setMargin(0, 0, DimenManager.interField(), 0);
label2.getManager().replace(label2, label);
label3.getManager().delete(label3);
}
});
}
};
label_title.setFont(FontManager.subtitle());
label_subtitle.setFont(FontManager.subtitle());
label1.setFont(FontManager.body());
label2.setFont(FontManager.body());
label3.setFont(FontManager.body());
BitmapButtonField button_accept = new BitmapButtonField(ImageResourceManager.buttonAccept(), ImageResourceManager.buttonAcceptHover(), FIELD_HCENTER)
{
protected void click()
{
super.click();
setImage(ImageResourceManager.buttonAcceptSelected());
setFocusImage(ImageResourceManager.buttonAcceptSelected());
}
protected void unclick()
{
super.unclick();
PersistentStoreManager.setTandCAccepted(true);
UiApplication.getUiApplication().pushScreen(new LoginScreen());
close();
}
};
BitmapButtonField button_decline = new BitmapButtonField(ImageResourceManager.buttonDecline(), ImageResourceManager.buttonDeclineHover(), FIELD_HCENTER)
{
protected void click()
{
super.click();
setImage(ImageResourceManager.buttonDeclineSelected());
setFocusImage(ImageResourceManager.buttonDeclineSelected());
}
protected void unclick()
{
super.unclick();
close();
}
};
int margin = (VariableManager.DISPLAY_WIDTH - button_accept.getPreferredWidth()) / 2;
// calculate where to put ellipsis
Font font = label2.getFont();
int max_length = (VariableManager.DISPLAY_WIDTH - margin * 2) * 2;
int i = copy_text2.length() - 1;
while (font.getAdvance(copy_text2.substring(0, i)) + font.getAdvance("...") >= max_length)
i--;
label2.setText(copy_text2.substring(0, i).trim() + "...");
VerticalFieldManager vfm = new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
vfm.add(new NullField());
vfm.add(label_subtitle);
vfm.add(new Seperator());
vfm.add(label1);
vfm.add(label2);
vfm.add(label3);
vfm.add(button_accept);
vfm.add(button_decline);
vfm.setMargin(0, margin, 0, margin);
// paddings
int padding = (DimenManager.header() - label_title.getPreferredHeight()) / 2;
label_title.setPadding(padding, 0, padding, 0);
label_subtitle.setPadding(DimenManager.interField(), 0, DimenManager.interField(), 0);
label1.setMargin(DimenManager.interField(), 0, DimenManager.interField(), 0);
label3.setMargin(DimenManager.interField(), 0, DimenManager.interField(), button_accept.getPreferredWidth() - label3.getPreferredWidth());
button_decline.setMargin(DimenManager.interField(), 0, DimenManager.interButton(), 0);
add(label_title);
add(vfm);
}
protected boolean onSavePrompt()
{
return false;
}
protected void makeMenu(Menu menu, int instance)
{
if (instance == Menu.INSTANCE_CONTEXT)
{
ContextMenu contextMenu = ContextMenu.getInstance();
contextMenu.setTarget(this);
contextMenu.clear();
this.makeContextMenu(contextMenu);
menu.deleteAll();
menu.add(contextMenu);
}
else
{
super.makeMenu(menu, instance);
}
}
protected void makeContextMenu(ContextMenu contextMenu)
{
}
/**
* Clickable labelfield which changes color on down press, and fires action
* on release. Action is canceled if touch moves outside field bounds.
*
* #author kevin
*
*/
private class ClickableLabel extends LabelField
{
private boolean canceled = true;
private boolean consumed = false;
protected boolean pressed = false;
public ClickableLabel(String label)
{
super(label, LabelField.FOCUSABLE | USE_ALL_WIDTH);
setFont(FontManager.body());
}
protected void paint(Graphics g)
{
// background
if (pressed)
{
g.setColor(0x2C1721);
}
else if (isFocus())
{
g.setColor(0x993C6B);
}
else
{
g.setColor(0x60223B);
}
int padding_y = (getPreferredHeight() - getFont().getHeight()) / 2;
int padding_x = getPaddingLeft();
g.drawText(getText(), padding_x, padding_y);
}
public int getPreferredHeight()
{
return ImageResourceManager.highlight().getHeight();
}
protected void layout(int width, int height)
{
height = getPreferredHeight();
super.layout(width, height);
setExtent(width, height);
}
// --------- Highlight selected row ---------
protected void onFocus(int direction)
{
super.onFocus(direction);
invalidate();
}
protected void onUnfocus()
{
super.onUnfocus();
invalidate();
}
// --------------------------------------------
protected void drawFocus(Graphics graphics, boolean on)
{
}
/**
* Called when trackpad pressed, or touchscreen touched
*/
protected void click()
{
pressed = true;
invalidate();
}
/**
* Called when trackpad released, or touchscreen released
*/
protected void unclick()
{
cancel();
}
protected void cancel()
{
pressed = false;
invalidate();
}
protected boolean navigationClick(int status, int time)
{
if (status != 0)
{
if (consumed)
{
consumed = false;
}
else
{
click();
}
}
return true;
}
protected boolean navigationUnclick(int status, int time)
{
if (status != 0)
{
if (consumed)
consumed = false;
else
unclick();
}
return true;
}
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 field
if (!canceled)
{
cancel();
}
canceled = true;
return false;
}
if (message.getEvent() == TouchEvent.UP)
{
if (canceled)
cancel();
else
unclick();
consumed = true;
return true;
}
if (message.getEvent() == TouchEvent.DOWN)
{
click();
consumed = true;
canceled = false;
return true;
}
return super.touchEvent(message);
}
}
private class Seperator extends SeparatorField
{
protected void paint(Graphics graphics)
{
graphics.setColor(0xa7a9ab);
super.paint(graphics);
}
}
}
Thanks in advance for any suggestions
I don't think it is possible to do anything but guess at your problem without looking at your code. But whatever your problem is, I am confident that it is based on a misunderstanding of how to use Managers within a Screen. So I recommend that you review the following articles to improve your knowledge in this area and so hopefully resolve the problem yourself:
Start here:
UI Introduction
This provides the Background around Managers and Fields.
Then read this article:
MainScreen Explained
I suspect as a result of reading this article, you may be able to discard your 'title bar' and use setTitle() or setBanner() to provide this function.
I hope this resolves your problems.
A few other points:
In all my years of BB programming, I have never had to use doPaint() to get something painting the way I wanted. I can't think of a situation that this will in fact help. So if you think you need it, try invalidate() instead.
I have used invalidate() when I making a change to the Field that will change its on screen appearance (but not its size). I have used it in a scroll change listener. But it is a method of last resort.
Remember that LabelFields are not focusable, so in OS's before 6, that made them a problem to scroll.
Found the issue. On the labelfields, there was a setExtent(getPreferredWidth(), getPreferredHeight()); that was reducing the size of the area to redraw. Very stupid mistake.
Thanks to everyone who tried to help.
I got a ScrollPane containing focusable Nodes.
The current default behaviour is:
Shift + ←, ↑, →, ↓ moves the focus
←, ↑, →, ↓ scrolls the view
I want it the other way around.
How can I accomplish this or where should I start?
[EDIT] Well, there is another fragile approach.
Instead of messing around with the events, one could mess around with the KeyBindings.
scrollPane.skinProperty().addListener(new ChangeListener<Skin<?>>() {
#Override
public void changed(ObservableValue<? extends Skin<?>> observable, Skin<?> oldValue, Skin<?> newValue) {
ScrollPaneSkin scrollPaneSkin = (ScrollPaneSkin) scrollPane.getSkin();
ScrollPaneBehavior scrollPaneBehavior = scrollPaneSkin.getBehavior();
try {
Field keyBindingsField = BehaviorBase.class.getDeclaredField("keyBindings");
keyBindingsField.setAccessible(true);
List<KeyBinding> keyBindings = (List<KeyBinding>) keyBindingsField.get(scrollPaneBehavior);
List<KeyBinding> newKeyBindings = new ArrayList<>();
for (KeyBinding keyBinding : keyBindings) {
KeyCode code = keyBinding.getCode();
newKeyBindings.add(code == KeyCode.LEFT || code == KeyCode.RIGHT || code == KeyCode.UP || code == KeyCode.DOWN ? keyBinding.shift() : keyBinding);
}
keyBindingsField.set(scrollPaneBehavior, newKeyBindings);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
LOGGER.warn("private api changed.", e);
}
}
});
I think, that could be the cleaner way, if KeyBindings were more non-static, modifyable and public.
Use an event filter to capture the relevant key events and remap them to different key events before the events start to bubble.
Re-mapping default keys is a tricky thing which:
Can confuse the user.
May have unexpected side effects (e.g. TextFields may no longer work as you expect).
So use with care:
import javafx.application.*;
import javafx.event.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.TilePane;
import javafx.stage.Stage;
import java.util.*;
public class ScrollInterceptor extends Application {
#Override
public void start(Stage stage) {
ScrollPane scrollPane = new ScrollPane(
createScrollableContent()
);
Scene scene = new Scene(
scrollPane,
300, 200
);
remapArrowKeys(scrollPane);
stage.setScene(scene);
stage.show();
hackToScrollToTopLeftCorner(scrollPane);
}
private void remapArrowKeys(ScrollPane scrollPane) {
List<KeyEvent> mappedEvents = new ArrayList<>();
scrollPane.addEventFilter(KeyEvent.ANY, new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent event) {
if (mappedEvents.remove(event))
return;
switch (event.getCode()) {
case UP:
case DOWN:
case LEFT:
case RIGHT:
KeyEvent newEvent = remap(event);
mappedEvents.add(newEvent);
event.consume();
Event.fireEvent(event.getTarget(), newEvent);
}
}
private KeyEvent remap(KeyEvent event) {
KeyEvent newEvent = new KeyEvent(
event.getEventType(),
event.getCharacter(),
event.getText(),
event.getCode(),
!event.isShiftDown(),
event.isControlDown(),
event.isAltDown(),
event.isMetaDown()
);
return newEvent.copyFor(event.getSource(), event.getTarget());
}
});
}
private TilePane createScrollableContent() {
TilePane tiles = new TilePane();
tiles.setPrefColumns(10);
tiles.setHgap(5);
tiles.setVgap(5);
for (int i = 0; i < 100; i++) {
Button button = new Button(i + "");
button.setMaxWidth(Double.MAX_VALUE);
button.setMaxHeight(Double.MAX_VALUE);
tiles.getChildren().add(button);
}
return tiles;
}
private void hackToScrollToTopLeftCorner(final ScrollPane scrollPane) {
Platform.runLater(new Runnable() {
#Override
public void run() {
scrollPane.setHvalue(scrollPane.getHmin());
scrollPane.setVvalue(0);
}
});
}
public static void main(String[] args) {
launch(args);
}
}
i m writing one application in which i have created custom list field for displaying listview.
my CustomListField contains one image and text in a row. i m gettiing field change listener on click of listfield row but i want to put fieldchange listener on image too..
can anyone tell me how can i do that.
here is my code.
public class CustomListField extends ListField implements ListFieldCallback {
private Vector _listData;
private int _MAX_ROW_HEIGHT = 60;
public CustomListField(Vector data) {
_listData = data;
setSize(_listData.size());
setSearchable(true);
setCallback(this);
setRowHeight(_MAX_ROW_HEIGHT);
}
protected void drawFocus(Graphics graphics, boolean on) {
XYRect rect = new XYRect();
graphics.setGlobalAlpha(150);
graphics.setColor(Color.BLUE);
getFocusRect(rect);
drawHighlightRegion(graphics, HIGHLIGHT_FOCUS, true, rect.x, rect.y, rect.width, rect.height);
}
public int moveFocus(int amount, int status, int time) {
this.invalidate(this.getSelectedIndex());
return super.moveFocus(amount, status, time);
}
public void onFocus(int direction) {
super.onFocus(direction);
}
protected void onUnFocus() {
this.invalidate(this.getSelectedIndex());
}
public void refresh() {
this.getManager().invalidate();
}
public void drawListRow(ListField listField, Graphics graphics, int index, int y, int w) {
listField.setBackground(BackgroundFactory.createBitmapBackground(Bitmap.getBitmapResource("listing_bg.png")));
ListRander listRander = (ListRander) _listData.elementAt(index);
graphics.setGlobalAlpha(255);
graphics.setFont(Font.getDefault().getFontFamily().getFont(Font.PLAIN, 24));
final int margin = 5;
final Bitmap thumb = listRander.getListThumb();
final String listHeading = listRander.getListTitle();
final Bitmap nevBar = listRander.getNavBar();
// list border
graphics.setColor(Color.GRAY);
graphics.drawRect(0, y, w, _MAX_ROW_HEIGHT);
// thumbnail border & thumbnail image
graphics.setColor(Color.BLACK);
// graphics.drawRoundRect(margin-2, y+margin-2,thumb.getWidth()+2, thumb.getHeight()+2, 5, 5);
graphics.drawBitmap(margin, y + margin, thumb.getWidth(), thumb.getHeight(), thumb, 0, 0);
// drawing texts
// graphics.setFont(Font.BOLD);
graphics.drawText(listHeading, margin + thumb.getWidth(), y + margin);
graphics.setColor(Color.GRAY);
// graphics.setFont(Font.smallFont); // graphics.drawText(listDesc, 2*margin+thumb.getWidth(), y+ margin+20); // //
// graphics.drawText(listDesc2, 2*margin+thumb.getWidth(), y+ margin+32);
// draw navigation button
final int navBarPosY = y + (_MAX_ROW_HEIGHT / 2 - nevBar.getHeight() / 2);
final int navBarPosX = Graphics.getScreenWidth() - nevBar.getWidth() + margin;
graphics.drawBitmap(navBarPosX, navBarPosY, nevBar.getWidth(), nevBar.getHeight(), nevBar, 0, 0);
}
public Object get(ListField listField, int index) {
String rowString = (String) _listData.elementAt(index);
return rowString;
}
public int indexOfList(ListField listField, String prefix, int start) {
for (Enumeration e = _listData.elements(); e.hasMoreElements();) {
String rowString = (String) e.nextElement();
if (rowString.startsWith(prefix)) {
return _listData.indexOf(rowString);
}
}
return 0;
}
public int getPreferredWidth(ListField listField) {
return 3 * listField.getRowHeight();
}
/*
protected boolean trackwheelClick(int status, int time) {
invalidate(getSelectedIndex());
Dialog.alert(" U have selected :" + getSelectedIndex());
return super.trackwheelClick(status, time);
}
*/
}
i want to put click listner on star image of listfield row
and following is output of abbove code.
I did something very similar to this on a past project:
Background
As Arhimed said in his answer, and as you can read about on the BlackBerry forums here, you can't have full-fledged Field objects within the ListField. The content of ListField rows is just drawn directly in drawListRow() as text, and Bitmaps, etc. The contents aren't Field instances, and therefore, are not focusable.
So, what I did was to replace ListField with a subclass of Manager. Originally, I used a VerticalFieldManager, but I ran into problems with that. I've also been seeing a lot of issues on stack overflow, where people subclass VerticalFieldManager, customize just one small behaviour, and everything starts breaking. It seems to me that VerticalFieldManager works well if you accept its normal behaviour, and if you need something more, just extend Manager directly. Performing layout for vertically stacked rows is pretty easy.
I then made each row its own Manager, and implemented custom layout in sublayout() to place the row's Fields where I wanted them. I could then also make the row focusable, and then a bitmap/button on the row separately focusable (like your star). Clicking the row invokes one action, and clicking the star invokes another one.
I will note, however, that in my app, performance was not an issue, because I only had 10-20 rows. Also, I did have to modify my code to match your example, so consider this code only lightly tested. However, I did build it into an app, so it should perform fine as long as my assumptions, and your description were valid.
Implementation
First, it wasn't clear to me what your ListRander is (you didn't show that code). However, in my code, I need a data class to contain details about one row. It looked like that's how you used ListRander, so that's what I used:
public class ListRander {
private String _title;
private Bitmap _thumb;
public ListRander(String title, Bitmap thumb) {
_title = title;
_thumb = thumb;
}
public String getTitle() {
return _title;
}
public Bitmap getThumb() {
return _thumb;
}
}
Then, I replaced your CustomListField class with my own:
public class CustomListField extends Manager implements FocusChangeListener {
private int _MAX_ROW_HEIGHT = 60;
private boolean _searchable = false;
private Vector _listData;
private FieldChangeListener _fieldListener;
public CustomListField(Vector data) {
super(FOCUSABLE | VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
setSearchable(true);
setEditable(false);
setListData(data);
}
public void setChangeListener(FieldChangeListener listener) {
// we need to save this listener, because we set it to listen to all new rows
_fieldListener = listener;
int numFields = getFieldCount();
for (int f = 0; f < numFields; f++) {
getField(f).setChangeListener(listener);
}
super.setChangeListener(listener);
}
public int getRowHeight() {
return _MAX_ROW_HEIGHT;
}
public void setSearchable(boolean searchable) {
_searchable = searchable;
}
public int getSelectedIndex() {
return getFieldWithFocusIndex(); // TODO??
}
public Object get(int index) {
return _listData.elementAt(index);
}
public int indexOfList(String prefix, int start) {
if (start >= _listData.size() || !_searchable) {
return -1;
} else {
int result = getSelectedIndex(); // the default result if we find no matches
for (Enumeration e = _listData.elements(); e.hasMoreElements(); ) {
String rowString = (String) e.nextElement();
if (rowString.startsWith(prefix)) {
return _listData.indexOf(rowString);
}
}
return result;
}
}
protected boolean navigationClick(int status, int time) {
CustomListRow focus = (CustomListRow) getFieldWithFocus();
if (focus != null) {
// see if the row wants to process this click
if (!focus.navigationClick(status, time)) {
// let our FieldChangeListener know that this row has been clicked
fieldChangeNotify(getFieldWithFocusIndex());
}
return true;
} else {
return false;
}
}
protected void sublayout(int width, int height) {
int w = Math.min(width, getPreferredWidth());
int h = Math.min(height, getPreferredHeight());
int rowHeight = getRowHeight();
int numRows = getFieldCount();
setExtent(w, h);
setVirtualExtent(w, rowHeight * numRows);
for (int i = 0; i < numRows; i++) {
Field f = getField(i);
setPositionChild(f, 0, rowHeight * i);
layoutChild(f, w, rowHeight);
}
}
public int getPreferredWidth() {
return Display.getWidth();
}
public int getPreferredHeight() {
return Display.getHeight();
}
public void setListData(Vector listData) {
_listData = listData;
if (listData != null) {
int listSize = listData.size();
int numRows = getFieldCount();
for (int s = 0; s < listSize; s++) {
if (s < numRows) {
// we can reuse existing CustomListRows
CustomListRow row = (CustomListRow) getField(s);
row.setData((ListRander) listData.elementAt(s));
} else {
CustomListRow row = new CustomListRow((ListRander) listData.elementAt(s));
row.setChangeListener(_fieldListener);
row.setFocusListener(this);
add(row);
}
}
if (listSize < numRows) {
// delete the excess rows
deleteRange(listSize, numRows - listSize);
}
} else {
deleteAll();
}
invalidate();
}
public void focusChanged(Field field, int eventType) {
// we handle scrolling here, when focus changes between rows
if (eventType == FOCUS_GAINED) {
if (field.getTop() < getVerticalScroll()) {
// field is off the top of the screen, so scroll up
setVerticalScroll(field.getTop());
} else if (field.getTop() >= getVerticalScroll() + getVisibleHeight()) {
// field is off the bottom of the screen, so scroll down
setVerticalScroll(field.getTop() - getVisibleHeight() + getRowHeight());
}
}
}
}
Finally, one row is represented by my CustomListRow class:
public class CustomListRow extends Manager implements FieldChangeListener {
private static final int _MAX_ROW_HEIGHT = 60;
private ListRander _data;
private BitmapField _thumb;
private LabelField _title;
private FocusableBitmapField _star;
private static final Bitmap _starImg = Bitmap.getBitmapResource("star.png");
private static final Bitmap _bgImg = Bitmap.getBitmapResource("listing_bg.png");
private SeparatorField _separator;
private int _fontColor = Color.BLACK;
private boolean _highlighted = false;
private int _width;
// subclass exists to expose focus methods (make public)
private class FocusableBitmapField extends BitmapField {
public FocusableBitmapField() {
super(_starImg, BitmapField.FOCUSABLE | BitmapField.EDITABLE);
}
public void onFocus(int direction) {
super.onFocus(direction);
}
public void onUnfocus() {
super.onUnfocus();
}
}
public CustomListRow(ListRander data) {
super(Field.FOCUSABLE | Manager.NO_VERTICAL_SCROLL | Manager.NO_VERTICAL_SCROLLBAR);
setBackground(BackgroundFactory.createBitmapBackground(_bgImg));
_width = Display.getWidth();
long labelStyle = (DrawStyle.LEFT | DrawStyle.TOP | DrawStyle.ELLIPSIS);
_title = new LabelField("", labelStyle) { // custom anonymous class to change font color
protected void paint(Graphics g) {
int c = g.getColor();
g.setColor(_fontColor);
super.paint(g);
g.setColor(c);
}
};
_title.setFont(Font.getDefault().getFontFamily().getFont(Font.PLAIN, 24));
_thumb = new BitmapField();
_star = new FocusableBitmapField();
_star.setChangeListener(this);
_separator = new SeparatorField() { // custom anonymous class to change separator color
protected void paint(Graphics g) {
int c = g.getColor();
g.setColor(Color.GRAY);
super.paint(g);
g.setColor(c);
}
};
setData(data);
add(_thumb);
add(_title);
add(_star);
add(_separator);
}
public ListRander getData() {
return _data;
}
public void setData(ListRander value) {
if (value != _data) {
_data = value;
_title.setText(value.getTitle());
_thumb.setBitmap(value.getThumb());
}
}
private void onStarClicked() {
Dialog.alert("Star has been clicked or tapped!");
}
private void onRowClicked() {
Dialog.alert("Row has been clicked or tapped!");
}
public void fieldChanged(Field field, int context) {
if (field == _star) {
onStarClicked();
}
}
public boolean navigationClick(int status, int time) {
if (_star.isFocus()) {
onStarClicked();
return true;
} /* else {
onRowClicked();
return true;
} */
return false; // we will not consume this event
}
protected void highlight(boolean onRow) {
_fontColor = onRow ? Color.WHITE : Color.BLACK; // change font color for contrast
_highlighted = onRow;
invalidate();
}
protected void onFocus(int direction) {
// called when focus first transfers to this row, from another Field
if (direction == 1) {
// coming from top to bottom, we highlight the row first, not the star
highlight(true);
} else if (direction == -1) {
// coming from bottom to top, we highlight the star button first, not the row
_star.onFocus(direction);
highlight(false);
}
}
protected void onUnfocus() {
// remove highlighting of the row, if any
highlight(false);
super.onUnfocus();
}
protected int moveFocus(int amount, int status, int time) {
// called when this row already has focus (either on row, or star button)
if (amount > 0) {
// moving top to bottom
if (!_star.isFocus()) {
// we were on the row, now move to the star button
_star.onFocus(1);
highlight(false);
amount--; // consume one unit of movement
}
} else {
// moving from bottom to top
if (_star.isFocus()) {
// we were on the star button, now move back over to the row
_star.onUnfocus();
highlight(true);
amount++; // consume one unit of movement
}
}
return amount;
}
protected boolean touchEvent(net.rim.device.api.ui.TouchEvent event) {
// We take action when the user completes a click (a.k.a. unclick)
int eventCode = event.getEvent();
if ((eventCode == TouchEvent.UNCLICK) || (eventCode == TouchEvent.DOWN)) {
// Get the touch location, within this Manager
int x = event.getX(1);
int y = event.getY(1);
if ((x >= 0) && (y >= 0) && (x < _width) && (y < _MAX_ROW_HEIGHT)) {
int field = getFieldAtLocation(x, y);
if ((field >= 0) && (getField(field) == _star)) {
// Let event propagate to (star) button field
return super.touchEvent(event);
} else {
if (eventCode == TouchEvent.UNCLICK) {
// A completed click anywhere else in this row should popup details for this selection
fieldChangeNotify(1);
onRowClicked();
} else {
// This is just a soft touch (TouchEvent.DOWN), without full click
setFocus();
}
// Consume the event
return true;
}
}
}
// Event wasn't for us, let superclass handle in default manner
return super.touchEvent(event);
}
protected void sublayout(int width, int height) {
height = Math.min(getPreferredHeight(), height);
setExtent(_width, height);
final int margin = 5;
int thumbWidth = _thumb.getPreferredWidth();
layoutChild(_thumb, thumbWidth, _thumb.getPreferredHeight());
setPositionChild(_thumb, margin, margin);
int starWidth = _star.getPreferredWidth();
int starHeight = _star.getPreferredHeight();
layoutChild(_star, starWidth, starHeight);
setPositionChild(_star, width - starWidth - margin, (height - starHeight) / 2);
// this assumes you want margin between all fields, and edges
layoutChild(_title, width - thumbWidth - starWidth - 4 * margin, _title.getPreferredHeight());
setPositionChild(_title, margin + thumbWidth /* + margin */, margin); // TODO?
}
protected void paintBackground(Graphics g) {
super.paintBackground(g);
if (_highlighted) {
// you can't override drawFocus() for a Manager, so we'll handle that here:
int oldColor = g.getColor();
int oldAlpha = g.getGlobalAlpha();
XYRect rect = new XYRect();
g.setGlobalAlpha(150);
g.setColor(Color.BLUE);
getFocusRect(rect);
drawHighlightRegion(g, HIGHLIGHT_FOCUS, true, rect.x, rect.y, rect.width, rect.height);
g.setGlobalAlpha(oldAlpha);
g.setColor(oldColor);
}
}
public int getPreferredWidth() {
return _width;
}
public int getPreferredHeight() {
return _MAX_ROW_HEIGHT;
}
}
Usage
This is how you might use the whole list field (maybe in a Screen class):
public class ListScreen extends MainScreen implements FieldChangeListener {
public ListScreen() {
try {
Vector data = new Vector();
Bitmap icon = Bitmap.getBitmapResource("list_icon.png");
for (int i = 0; i < 15; i++) {
ListRander lr = new ListRander("Product Name " + i, icon);
data.addElement(lr);
}
CustomListField list = new CustomListField(data);
add(list);
list.setChangeListener(this);
} catch (Exception e) {
e.printStackTrace();
}
}
public void fieldChanged(Field field, int context) {
if (field instanceof CustomListRow) {
CustomListRow row = (CustomListRow) field;
Dialog.alert(row.getData().getTitle() + " was selected!");
}
}
}
In my app, it made sense for the CustomListRow itself to handle the equivalent of your star click. However, for me, it did not make sense to have the row click handled that way. So, I let you set a FieldChangeListener on the CustomListField itself, which is called back when any row is selected. See the example above in my screen class. If you want to handle the row click inside the CustomListRow class, too, that's fine. I laid out a onRowClicked() method there. Search in the code for where that's commented out, and you can reactivate, an implement that method (onRowClicked()).
Issues
My app didn't require list searching. I laid out a sample implementation of that, like ListField has. But, I didn't test it. That's your job, if you need it. I just got you started with the CustomListField implementation (see indexOfList()).
I didn't see what your "nav bar" was for. A bar is usually a full-width item, like a status bar, or toolbar. I don't see anything like that in your screenshot. A nav item might be a little arrow at the right side of each row, to bring up details. But, I didn't see that in your screenshot either. So, I ignored that code. If you need a nav bar, you obviously know what it should be, and can add that to my code above.
I couldn't tell whether or not you just added the star as part of the row's background image, or if you had a separate image for that. I added a separate star.png to represent the star. I would assume that clicking the star fills it in, or highlights it, or something. But, you didn't describe that problem, so I assume you can handle that. If you need a custom field to represent the star, that can have selected and unselected images, just post that as a new question.
You had some code that appeared like it was trying to set the row width to 3x the row height, but that didn't match your screen shot. Most lists are full-screen width anyway. So, I remove that code. My CustomListRow class implements getPreferredWidth() and requests the full screen width. Change if you like.
Unlike Android's ListView the BB's ListField is not designed to have a focusable/clickable fields inside of list items. So any attempt to workaround this will have some negative side effects.
A relatively easy/quick workaround would be to switch to VerticalFieldManager (check this other stack overflow question). But if the list is too long (more than several hundreds, I believe) you risk to "eat" too much memory.
If the app is designed for touch screens only, then you can try to stay with ListField + do some manual tracking of touch event coordinates. So when you detect a list field click (in a way you would normally do it) you can check whether the touch coordinates correspond to the star image area (at least on the X axis). I am not going to invent/provide an implementation, but just giving an idea.
How to display a progress screen when BlackBerry application is fetching data from remote server ?
I want an progress screen without animated gif without any button. (OK or Cancel )
public class ProgressDialog extends PopupScreen
{
public ProgressDialog(String waitString)
{
super(new VerticalFieldManager());
add(new LabelField(waitString,Field.FIELD_HCENTER));//add a string which u want to show for progressing
}
}
ProgressDialog progress = new ProgressDialog("Please Wait...");
//Add screen to UI
UiApplication.getUiApplication().pushScreen(progress);
//Remove screen from UI
progress.close();
ProgressBar progressBar = new ProgressBar("Waiting for location update....",50,1000);
progressBar.start(); // Start progress bar
progressBar.remove(); //remove progress bar
ProgressBar Thread
public class ProgressBar extends Thread {
Thread thd;
private int maximum, timeout;
private boolean useful = true;
private PopupScreen popup;
private int iterations = 0;
/**
* Object constructor
*
* #param title
* Text to display on popup area
* #param maximum
* Range / width of the gauge field of progress bar
* #param timeout
* Milliseconds to pause between updates to progress bar
* #see GaugeField
* #see Thread
* #see PopupScreen
*/
public ProgressBar(String title, int maximum, int timeout) {
this.maximum = maximum;
this.timeout = timeout;
VerticalFieldManager manager = new VerticalFieldManager();
popup = new PopupScreen(manager);
manager.add(new LabelField(title));
}
/**
* run() method for starting thread
*/
public void run() {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
UiApplication.getUiApplication().pushScreen(popup);
}
});
int iterations = 0;
while (useful) {
System.out.println("I m here in while runn "+ useful);
try {
Thread.sleep(timeout);
} catch (Exception e) {
}
if (++iterations > maximum)
{
iterations = 1;
useful = false;
UiApplication.getUiApplication().invokeLater( new Runnable()
{
public void run ()
{
_locationProvider.reset();
Dialog.alert("Location not found.");
}
} );
}
// gaugeField.setValue(iterations);
}
if (popup.isDisplayed()) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
UiApplication.getUiApplication().popScreen(popup);
}
});
}
}
/**
* Method to shutdown the thread and remove the popup screen
*
*/
public synchronized void remove() {
useful = false;
}
}