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I am trying convert PDF to grayscale(Black/White) PDF using Websupergoo ABCpdf.
I am referring
http://www.websupergoo.com/helppdfnet/source/8-abcpdf.operations/3-recoloroperation/1-methods/recolor.htm?q=recoloroperation
Doc theDoc = new Doc();
theDoc.Read(Server.MapPath("src.pdf"));
int pages = theDoc.PageCount;
MyOp.Recolor(theDoc, (WebSupergoo.ABCpdf8.Objects.Page)theDoc.ObjectSoup[theDoc.Page]); //Here problem
theDoc.Save(Server.MapPath("greyscale1.pdf"));
theDoc.Clear();
Above code works fine for single page PDf.
This Code Converts only first page of PDF
When I tried to use a loop the below error is occurring
Page Number is not the same as Page in abcPDF, so you cannot use the page number as an index into the object soup.
Try something like this instead (untested):
int pages = theDoc.PageCount;
for(int i=0; i < pages; i++)
{
theDoc.PageNumber = i;
MyOp.Recolor(theDoc, (WebSupergoo.ABCpdf8.Objects.Page)theDoc.ObjectSoup[theDoc.Page]);
}
Edit: The above apparently didn't work, but as the documentation you linked to shows, there's a method that takes a Doc object instead of a Page object. This should work if you change your MyOp.Recolor() method to this:
public class MyOp
{
public static void Recolor(Doc doc) {
RecolorOperation op = new RecolorOperation();
op.DestinationColorSpace = new ColorSpace(doc.ObjectSoup, ColorSpaceType.DeviceGray);
op.ConvertAnnotations = false;
op.ProcessingObject += Recoloring;
op.ProcessedObject += Recolored;
op.Recolor(doc);
}
}
I am not sure what you are doing (or need to do) in the Recoloring() method or Recolored() method, but that should not matter for the changes here.
Since I went crazy with converting PDF to grayscale here
c# printing through PDF drivers, print to file option will output PS instead of PDF
I found above answer (thank you) but needs to be corrected a little bit for everyone may need:
Doc theDoc = new Doc();
theDoc.Read("test.pdf");
//doc.Rendering.ColorSpace = XRendering.ColorSpaceType.Gray;
//doc.SaveOptions.
//MyOp.Recolor(theDoc, (Page)theDoc.ObjectSoup[theDoc.Page]);
int pages = theDoc.PageCount;
for (int i = 0; i < pages; i++)
{
theDoc.PageNumber = i+1; // this is because numbering is from 1 :)
MyOp.Recolor(theDoc, (Page)theDoc.ObjectSoup[theDoc.Page]);
}
theDoc.Save("out.pdf");
theDoc.Clear();
The class remains as in their example
public class MyOp
{
public static void Recolor(Doc doc, Page page)
{
RecolorOperation op = new RecolorOperation();
op.DestinationColorSpace = new ColorSpace(doc.ObjectSoup, ColorSpaceType.DeviceGray);
op.ConvertAnnotations = false;
op.ProcessingObject += Recoloring;
op.ProcessedObject += Recolored;
op.Recolor(page);
}
//public static void Recolor(Doc doc)
//{
// RecolorOperation op = new RecolorOperation();
// op.DestinationColorSpace = new ColorSpace(doc.ObjectSoup, ColorSpaceType.DeviceGray);
// op.ConvertAnnotations = false;
// op.ProcessingObject += Recoloring;
// op.ProcessedObject += Recolored;
// op.Recolor(doc);
//}
public static void Recoloring(object sender, ProcessingObjectEventArgs e)
{
PixMap pm = e.Object as PixMap;
if (pm != null)
{
ColorSpaceType cs = pm.ColorSpaceType;
if (cs == ColorSpaceType.DeviceCMYK)
e.Cancel = true;
e.Tag = cs;
}
}
public static void Recolored(object sender, ProcessedObjectEventArgs e)
{
if (e.Successful)
{
PixMap pm = e.Object as PixMap;
if (pm != null)
{
ColorSpaceType cs = (ColorSpaceType)e.Tag;
if (pm.Width > 1000)
pm.CompressJpx(30);
else if (cs == ColorSpaceType.DeviceRGB)
pm.CompressJpeg(30);
else
pm.Compress(); // Flate
}
}
}
}
Don't forget to use (not other version) and works like a charm.
using WebSupergoo.ABCpdf9.Objects;
using WebSupergoo.ABCpdf9.Operations;
I am creating an application in Xamarin.I want to use Auto-Scroll feature and i am not able to do that in a proper way. I am able to scroll manually. BUt i want to display the next picture automatically without scrolling.
Kindly share your views and codes.
I have used sliders for now. But i would like to know if i can do something better.
Grid SliderGrid = new Grid ();
//SliderGrid.BackgroundColor = Color.Black;
//SliderGrid.Padding = 10;
int SlidercolumnCount = Slider.Count;
RowDefinition Sliderrow = new RowDefinition ();
SliderGrid.RowDefinitions.Add (Sliderrow);
for (int j = 0; j < SlidercolumnCount; j++) {
ColumnDefinition col = new ColumnDefinition ();
SliderGrid.ColumnDefinitions.Add (col);
}
for (int i = 0; i < SlidercolumnCount; i++) {
var vetImageCol = new Image {
HeightRequest=260,
WidthRequest=360,
BindingContext = Slider [i],
Source = Slider [i].CategoryImage,
Aspect=Aspect.AspectFill,
};
Grid.SetColumn (vetImageCol, i);
SliderGrid.Children.Add (vetImageCol);
}
var SliderContent = new ScrollView {
Orientation=ScrollOrientation.Horizontal,
HorizontalOptions=LayoutOptions.FillAndExpand,
//HeightRequest=265,
Content= SliderGrid,
};
It's ok to do it with Task commands like this one:
private async void DoSomethingAsync()
{
await Task.Delay(1000);
DoSomething();
await Task.Delay(1000);
DoSomethingelse();
}
Although it's better to do it with Task return value instead of void but you get the idea
//page view is may ui scroll view
//counter for if my image focus on last image then return on 1 img
//new PointF((float)(your image size * count),your top margin or your fram y);
int count = 0;
public async void StartTimer()
{
await Task.Delay(3000); //3 sec
count += 1;
if (count == 5)
{
count = 0;
}
var bottomOffset = new PointF((float)(UIScreen.MainScreen.Bounds.Width * count),0);
pageview.SetContentOffset(bottomOffset, animated: true);
StartTimer();
}
public override void ViewDidLoad(){
StartTimer();
}
I have a screen which call a listfield.
public class Main_AllLatestNews extends MainScreen {
private Database_Webservice webservice;
private String[] title, category, date, imagepath = {"no picture", "no picture", "no picture", "no picture","no picture","no picture","no picture","no picture","no picture", "no picture"};
private int[] newsid;
private List_News newslist;
public Main_AllLatestNews(final boolean needdownload) {
super(USE_ALL_WIDTH);
webservice = new Database_Webservice();
add(new Custom_TopField(this, 0, -1, "", 1, 1));
add(new Custom_BottomField(this, 0));
add(new Custom_HeaderField(Config_GlobalFunction.latest));
if (needdownload){
Main.getUiApplication().pushScreen(
new Custom_LoadingScreen(30));
webservice.UpdateAllCatNews();
}else {
webservice.LoadtodayNews();
newsid = new int[webservice.news.size()];
title = new String[webservice.news.size()];
category = new String[webservice.news.size()];
date = new String[webservice.news.size()];
//imagepath = new String[webservice.news.size()];
for (int i = 0; i < webservice.news.size(); i++) {
newslist = (List_News) webservice.news.elementAt(i);
newsid[i] = newslist.getID();
title[i] = newslist.getNtitle();
category[i] = newslist.getNewCatName();
date[i] = newslist.getNArticalD();
//imagepath[i] = newslist.getImagePath();
}
add(new Custom_ListField(newsid, title, date, category, imagepath, true));
}
}
}
When I add custom_listfield then I get:
Failed to allocate timer 0: no slots left
Here is my listfield
public Custom_ListField(int newsid[], String title[], String date[],
String category[], String imagepath[], boolean islatest) {
super(0, ListField.MULTI_SELECT);
this.newsid = newsid;
setCallback(this);
setBackground(Config_GlobalFunction.loadbackground("background.png"));
this.islatest = islatest;
rows = new Vector();
for (int x = 0; x < title.length; x++) {
TableRowManager row = new TableRowManager();
titlelabel = new Custom_LabelField(title[x],
LabelField.USE_ALL_WIDTH | DrawStyle.LEFT);
titlelabel.setFont(Font.getDefault().derive(Font.BOLD, 23));
row.add(titlelabel);
datelabel = new Custom_LabelField(date[x], DrawStyle.ELLIPSIS
| LabelField.USE_ALL_WIDTH | DrawStyle.LEFT);
datelabel.setFont(Font.getDefault().derive(Font.BOLD, 18));
datelabel.setFontColor(Color.GRAY);
row.add(datelabel);
categorylabel = new Custom_LabelField(category[x],
DrawStyle.ELLIPSIS | LabelField.USE_ALL_WIDTH
| DrawStyle.LEFT);
categorylabel.setFont(Font.getDefault().derive(Font.BOLD, 18));
categorylabel.setFontColor(Color.RED);
row.add(categorylabel);
/*Bitmap imagebitmap = null;
if (!imagepath[x].toString().equals("no picture")) {
imagebitmap = Util_ImageLoader.loadImage(imagepath[x]);
} else {
imagepath[x] = "image_base.png";
imagebitmap = Bitmap.getBitmapResource(imagepath[x]);
}
image = new BitmapField(imagebitmap, Field.FIELD_HCENTER
| Field.FIELD_VCENTER);
row.add(image);*/
//setRowHeight(image.getBitmapHeight() + 10);
setRowHeight(70);
rows.addElement(row);
}
setSize(rows.size());
}
In this list, it will call 10 images or more. First I will check got link send to it else load local images. So the row height must be not same, however, it does not auto set row height for each row but set a same height to all row. I think out of memory because i call too many images? but I call in android also no problem.
This is my imageloader.
public class Util_ImageLoader {
public static Bitmap loadImage(String url) {
HttpConnection connection = null;
InputStream inputStream = null;
EncodedImage bitmap;
byte[] dataArray = null;
try {
// can use this for BlackBerry 5.0+ :
// connection = (HttpConnection) (new
// ConnectionFactory()).getConnection(url).getConnection();
connection = (HttpConnection) Connector
.open(url + Util_GetInternet.getConnParam(),
Connector.READ, true);
int responseCode = connection.getResponseCode();
if (responseCode == HttpConnection.HTTP_OK) {
inputStream = connection.openDataInputStream();
dataArray = IOUtilities.streamToBytes(inputStream);
}
} catch (Exception ex) {
} finally {
try {
inputStream.close();
connection.close();
} catch (Exception e) {
}
}
if (dataArray != null) {
bitmap = EncodedImage.createEncodedImage(dataArray, 0,
dataArray.length);
return bitmap.getBitmap();
} else {
return null;
}
}
}
1) What can I do to reduce the use of memory?
2) How to set different row height? I am set bitmap.getbitmapheight() but different bitmap will have different height.
//Updated//
I am running on simulator 9930 OS 7.0 and 8520 OS 5.0. Both also same result. Real Device cannot run because after signing the key also prompt the warning message try to Secure APi. I am completely commented all the images also same. I did not call neither online nor local image. I think is the data problem?
#AlanLai, can you tell us which device this is being run on, and which OS? Is it a simulator, or real hardware? Why don't you try commenting out the image completely. Don't show any images (network images, or local images). See if you still get the problem. Let's try to narrow down where exactly the code is that's causing your problem. Note: please post the information about which device you're testing on above, in the question, not as a comment response here. Thanks
How about to have only one TableRowManager and every drawRow set values with layout with specific values?
There's a lot of things you can do to reduce memory usage. For one, try to avoid keeping objects in memory longer than you really need them. One way this happens is if you keep member variables in your class, that could really be local variables in a method. Keeping member variables may lead to objects living longer than they need to, preventing the release of the memory they occupy.
Util_ImageLoader
For example, in Util_ImageLoader, you do almost all the work in the constructor. But then, you keep the result around (the Bitmap) in a static member variable (_bmap), which keeps it in memory. I know you do this so that you can call getBitmap(). But, you could change the class to be like this:
public class Util_ImageLoader {
public static Bitmap loadImage(String url) {
HttpConnection connection = null;
InputStream inputStream = null;
EncodedImage bitmap;
byte[] dataArray = null;
try {
// can use this for BlackBerry 5.0+ :
// connection = (HttpConnection) (new ConnectionFactory()).getConnection(url).getConnection();
connection = (HttpConnection) Connector.open(url + Util_GetInternet.getConnParam(), Connector.READ,
true);
int responseCode = connection.getResponseCode();
if (responseCode == HttpConnection.HTTP_OK) {
inputStream = connection.openDataInputStream();
dataArray = IOUtilities.streamToBytes(inputStream);
}
} catch (Exception ex) {
}
finally {
try {
inputStream.close();
connection.close();
} catch (Exception e) {
}
}
if (dataArray != null) {
bitmap = EncodedImage.createEncodedImage(dataArray, 0, dataArray.length);
return bitmap.getBitmap();
} else {
return null;
}
}
}
Because your Util_ImageLoader class doesn't really have any state associated with it, you can probably make it a class with just one static method. The static method does not require you to create an instance of Util_ImageLoader to use it. Just do this:
Bitmap img = Util_ImageLoader.loadImage("http://domain.com/path/image.png");
This allows the image that's loaded to be released as soon as the UI is done with it. The existing code keeps that image in memory for the life of the program.
Also, I replaced your custom code that uses a byte[] buffer, with the useful IOUtilities.streamtoBytes() method. Let the built-in libraries do the work of optimizing for you. Most of the time, they will do a pretty good job of that.
You also had some fixed point scaling code in your Util_ImageLoader class that wasn't doing anything. It was creating a scaled image of the same size as the original. So, I just removed that code. That can only help your memory usage. Image manipulation can be expensive.
Finally, I checked the web server return code (HTTP_OK) before I created any of the large objects needed for this method. If the network request fails, you certainly don't want to waste memory for no reason.
Custom_ListField
Again, you are keeping some objects around, possibly longer than needed. Let's go through your member variables:
private Bitmap bg = Bitmap.getBitmapResource("background.png"),
imagebitmap;
I don't know how many instances of Custom_ListField you will have in your app, but if you are going to assign bg to a constant app resource image, you should at least make it a static member variable, so that if there are 10 instances of Custom_ListField, you will only be keeping one bg variable in memory:
private static Bitmap bg = Bitmap.getBitmapResource("background.png"),
imagebitmap;
But, in your case, I don't think you need to keep that member variable at all. You can simply replace it where it's used, like this:
Background background = BackgroundFactory.createBitmapBackground(Bitmap.getBitmapResource("background.png"));
Then, the imagebitmap member can also be replaced with a local variable:
Bitmap imageBitmap = null;
if (!imagepath[x].toString().equals("no picture")) {
imageBitmap = Util_ImageLoader.loadImage(imagepath[x]);
imageBitmap = loader.getbitmap();
} else {
imagepath[x] = "image_base.png";
imageBitmap = Bitmap.getBitmapResource(imagepath[x]);
}
image = new BitmapField(imageBitmap, Field.FIELD_HCENTER | Field.FIELD_VCENTER);
imageBitmap only needs to be a local variable, not a member variable.
Debugging memory usage usually requires having the whole program, running, and profiling it. With only some of your code, I can't see all the other code that uses it. How many of each class is created is important? Which images are the large ones, and which are small? These are all questions you need to ask yourself to get your memory usage down.
But, hopefully, the general techniques I showed example of above can help you get started.
The problem was the Custom_ListField. This should extends listfield
instead of custom extends manager
public class Custom_ListField extends ListField {
private String[] title, category, date, imagepath;
private int[] newsid, catsid;
private List_News newslist;
private Bitmap imagebitmap[], localimage = Bitmap
.getBitmapResource("image_base.png");
private BrowserField webpage;
private Custom_BrowserFieldListener listener;
private boolean islatest;
private Vector content = null;
private ListCallback callback = null;
private int currentPosition = 0;
public Custom_ListField(Vector content, boolean islatest) {
this.content = content;
this.islatest = islatest;
newsid = new int[content.size()];
title = new String[content.size()];
category = new String[content.size()];
date = new String[content.size()];
imagepath = new String[content.size()];
catsid = new int[content.size()];
imagebitmap = new Bitmap[content.size()];
for (int i = 0; i < content.size(); i++) {
newslist = (List_News) content.elementAt(i);
newsid[i] = newslist.getID();
title[i] = newslist.getNtitle();
category[i] = newslist.getNewCatName();
date[i] = newslist.getNArticalD();
imagepath[i] = newslist.getImagePath();
if (!imagepath[i].toString().equals("no picture")) {
imagebitmap[i] = Util_ImageLoader.loadImage(imagepath[i]);
} else {
imagebitmap[i] = localimage;
}
catsid[i] = newslist.getCatID();
}
initCallbackListening();
this.setRowHeight(localimage.getHeight() + 10);
}
private void initCallbackListening() {
callback = new ListCallback();
this.setCallback(callback);
}
private class ListCallback implements ListFieldCallback {
public ListCallback() {
setBackground(Config_GlobalFunction
.loadbackground("background.png"));
}
public void drawListRow(ListField listField, Graphics graphics,
int index, int y, int width) {
currentPosition = index;
graphics.drawBitmap(
Display.getWidth() - imagebitmap[index].getWidth() - 5,
y + 3, imagebitmap[index].getWidth(),
imagebitmap[index].getHeight(), imagebitmap[index], 0, 0);
graphics.setColor(Color.WHITE);
graphics.drawRect(0, y, width, imagebitmap[index].getHeight() + 10);
graphics.setColor(Color.BLACK);
graphics.setFont(Font.getDefault().derive(Font.BOLD, 20));
graphics.drawText(title[index], 5, y + 3, 0, Display.getWidth()
- imagebitmap[index].getWidth() - 10);
System.out.println(Display.getWidth()
- imagebitmap[index].getWidth() - 10);
graphics.setColor(Color.GRAY);
graphics.setFont(Font.getDefault().derive(Font.BOLD, 15));
graphics.drawText(date[index], 5, y + 6
+ Font.getDefault().getHeight() + 3);
if (islatest) {
graphics.setColor(Color.RED);
graphics.setFont(Font.getDefault().derive(Font.BOLD, 15));
graphics.drawText(category[index], Font.getDefault()
.getAdvance(date[index]) + 3, y + 6
+ Font.getDefault().getHeight() + 3);
}
}
public Object get(ListField listField, int index) {
return content.elementAt(index);
}
public int getPreferredWidth(ListField listField) {
return Display.getWidth();
}
public int indexOfList(ListField listField, String prefix, int start) {
return content.indexOf(prefix, start);
}
}
public int getCurrentPosition() {
return currentPosition;
}
protected boolean navigationClick(int status, int time) {
int index = getCurrentPosition();
if (catsid[index] == 9) {
if (Config_GlobalFunction.isConnected()) {
webpage = new BrowserField();
listener = new Custom_BrowserFieldListener();
webpage.addListener(listener);
MainScreen aboutus = new Menu_Aboutus();
aboutus.add(webpage);
Main.getUiApplication().pushScreen(aboutus);
webpage.requestContent("http://www.orientaldaily.com.my/index.php?option=com_k2&view=item&id="
+ newsid[index] + ":&Itemid=223");
} else
Config_GlobalFunction.Message(Config_GlobalFunction.nowifi, 1);
} else
Main.getUiApplication().pushScreen(
new Main_NewsDetail(newsid[index]));
return true;
}
}
I am using a ListField in BlackBerry and want to include a button with two text fields in the row like:
Button
Text1
Text2
But I am not able to add the buttons. All the help I've found is about adding images.
Take a look at How to customize list field in blackberry and Blackberry - how to add fields to listfield
by default ... list field provides the focus on a single row as a whole....and not to the single field on a row(as u told that u want to add three fields....buttons, textfield, textfield).
so i want to know why do u want to add buttons and two separate text-fields in a single row... I think its not easy if u want to get focus only on button OR only on a text-field....in a single row of a list field.
by the way... here is the sample code........ how u create three fields in a single row of list field...
just call the constructor of this list-field class in ur main screen's class and add it like.....
DetailListField _listField = new DetailListField();
add(_listField);
DetailListField class -
class DetailListField extends ListField implements ListFieldCallback
{
private Vector rows;
private Font font;
public DetailListField()
{
this(0, ListField.USE_ALL_WIDTH | DrawStyle.LEFT);
}
public DetailListField(int numRows, long style)
{
super(0, style);
try
{
rows = new Vector();
font = Font.getDefault().derive(Font.PLAIN, 7, Ui.UNITS_pt);
setRowHeight(-2);
setCallback(this);
for (int x = 0 ; x < 5 ; x++)
{
TableRowManager row = new TableRowManager();
// button, textfield, textfield
ButtonField _btn = new ButtonField("Button", ButtonField.CONSUME_CLICK);
_btn.setBorder(VISUAL_STATE_NORMAL, BorderFactory.createSimpleBorder(new XYEdges(1,1,1,1),
new XYEdges(0x557788, 0xAA22BB, 0x557788, 0xAA22BB),
Border.STYLE_SOLID));
row.add(_btn);
BasicEditField _basicEdit1 = new BasicEditField(BasicEditField.EDITABLE | BasicEditField.FILTER_DEFAULT);
_basicEdit1.setBorder(VISUAL_STATE_NORMAL, BorderFactory.createSimpleBorder(new XYEdges(2,2,2,2),
new XYEdges(0x557788, 0xAA22BB, 0x557788, 0xAA22BB),
Border.STYLE_SOLID));
row.add(_basicEdit1);
BasicEditField _basicEdit2 = new BasicEditField(BasicEditField.EDITABLE | BasicEditField.FILTER_DEFAULT);
_basicEdit2.setBorder(VISUAL_STATE_NORMAL, BorderFactory.createSimpleBorder(new XYEdges(2,2,2,2),
new XYEdges(0x994422, 0xAA22BB, 0x994422, 0xAA22BB),
Border.STYLE_SOLID));
row.add(_basicEdit2);
// add id to the vector.
rows.addElement(row); // returnData[x][0]);
// call draw list row
// then call constructor of manager class
}
setSize(rows.size());
invalidate();
} catch(Exception e) {
}
}
public void drawListRow(ListField list, Graphics g, int index, int y, int width)
{
try
{
DetailListField dl = (DetailListField)list;
TableRowManager rowManager = (TableRowManager)dl.rows.elementAt(index);
rowManager.drawRow(g, 0, y, width, list.getRowHeight());
} catch(Exception e) {
}
}
protected boolean keyChar(char key, int status, int time)
{
if (key == Characters.ENTER)
{
return true;
// We've consumed the event.
}
else if(key == Characters.ESCAPE)
{
return true;
}
return super.keyChar(key, status, time);
}
protected boolean navigationClick(int status, int time)
{
try
{
// use below method if want to get label value from manager.
final int index = this.getSelectedIndex();
if(index >= 0) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert("Selected index number : " + (index + 1));
}
});
}
} catch (final Exception e) {
}
return true;
}
public Object get(ListField listField, int index)
{
// TODO Auto-generated method stub
return rows.elementAt(index);
}
public int getPreferredWidth(ListField listField)
{
// TODO Auto-generated method stub
return 0;
}
public int indexOfList(ListField listField, String prefix, int start)
{
// TODO Auto-generated method stub
return rows.indexOf(prefix, start);
}
/**
* MANAGER CLASS
*/
private class TableRowManager extends Manager
{
int _height = 0, _width = 0;
int yPos = 0;
public TableRowManager()
{
super(0);
}
// Causes the fields within this row manager to be layed out then
// painted.
public void drawRow(Graphics g, int x, int y, int width, int height)
{
try
{
_height = height;
_width = getPreferredWidth();
yPos = y;
// Arrange the cell fields within this row manager.
// set the size and position of each field.
layout(_width, _height);
// Place this row manager within its enclosing list.
setPosition(x, y);
// Apply a translating/clipping transformation to the graphics
// context so that this row paints in the right area.
g.pushRegion(getExtent());
// Paint this manager's controlled fields.
subpaint(g);
g.setColor(0x00CACACA);
g.drawLine(0, 0, getPreferredWidth(), 0);
// Restore the graphics context.
g.popContext();
} catch(Exception e) {
System.out.println("Exeception : (DetailListField) 4 : " + e.toString());
}
}
// Arranges this manager's controlled fields from left to right within
// the enclosing table's columns.
protected void sublayout(int width, int height)
{
try
{
// set the bitmap field
Field _field0 = getField(0);
layoutChild(_field0, (_width/3) - 30 , _height - 20);
setPositionChild(_field0, 2, 5);
// set the name field
Field _field1 = getField(1);
_field1.setFont(font);
layoutChild(_field1, (_width/3) - 30, _field1.getPreferredHeight());
setPositionChild(_field1, (_width/3) - 30 + 10, 5);
Field _field2 = getField(2);
_field2.setFont(font);
layoutChild(_field2, (_width/3) - 30, _field2.getPreferredHeight());
setPositionChild(_field2, ((_width/3) - 30)*2 + 20, 5);
setExtent(_width, _height);
} catch(Exception e) {
System.out.println("Exeception : (DetailListField) 5 : " + e.toString());
}
}
// The preferred width of a row is defined by the list renderer.
public int getPreferredWidth()
{
return (Display.getWidth());
}
// The preferred height of a row is the "row height" as defined in the
// enclosing list.
public int getPreferredHeight()
{
return _height;
}
}
}
bt still i dont know how to get focus on single field of a single row...
usage:
ListCallBack _callBack = new ListCallBack();
_countries.setCallback(_callBack);
code:
private class ListCallBack implements ListFieldCallback{
public void drawListRow(ListField listField, Graphics graphics,
int index, int y, int width) {
for(int i = 0; i <= 23; i++) {
graphics.drawBitmap(0, y, 48, 48, (Bitmap) MyApp._flagVector.elementAt(index), 0, 0);
}
String text = (String)MyApp._countryVector.elementAt(index);
graphics.drawText(text, 65, y, 0, width);
}
public Object get(ListField listField, int index) {
return MyApp._countryVector.elementAt(index);
}
public int getPreferredWidth(ListField listField) {
return Display.getWidth();
}
public int indexOfList(ListField listField, String prefix, int start) {
return MyApp._countryVector.indexOf(prefix, start);
}
}
I can't find solution for the following problem. I have custom list field, which overlaps the boundaries of its layout manager. List field consumes navigation events from manager to highlight currently selected row with special color. Layout manager is configured to support scrolling. When I scroll trackwheel down, layout manager invokes scrolling and then passes navigation event to its child, the list field. It results in inproper scrolling, because manager scrolls the whole list down to its bottom hiding list rows on the top including the selected row.
What I want is to ignore scrolling while currently selected list row is still visible and employ it otherwise.
I'm using JDE 4.2.1
Let's say we have ListField implementation:
class LabelListField extends ListField implements ListFieldCallback {
private Vector mValues;
public LabelListField(Vector values) {
super(0);
setRowHeight(getFont().getHeight() + 10);
setCallback(this);
mValues = values;
setSize(mValues.size());
}
public void drawListRow(ListField listField, Graphics g, int index, int y,
int width) {
g.drawText((String) mValues.elementAt(index), 0, y);
}
public Object get(ListField list, int index) {
return mValues.elementAt(index);
}
public int indexOfList(ListField list, String prefix, int start) {
for (int x = start; x < mValues.size(); ++x) {
String value = (String) mValues.elementAt(x);
if (value.startsWith(prefix)) {
return x;
}
}
return -1;
}
public int getPreferredWidth(ListField list) {
return Display.getWidth();
}
}
If we want to align this list within upper and lower fields this way:
ListField with scroll http://img6.imageshack.us/img6/7025/8800j.png
we can limit it's height using custom manager:
class ListManager extends HorizontalFieldManager {
ListField mListField;
public ListManager(ListField listField) {
super(VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
mListField = listField;
add(mListField);
}
public int getPreferredHeight() {
int result = Display.getHeight();
Manager manager = getManager();
if (null != manager) {
for (int i = 0, count = manager.getFieldCount(); i < count; i++) {
if (manager.getField(i) != this)
result -= manager.getField(i).getPreferredHeight();
}
}
// size down to fit max rows without splitting
result = result - result % mListField.getRowHeight();
return result;
}
protected void sublayout(int maxWidth, int maxHeight) {
super.sublayout(maxWidth, maxHeight);
setExtent(maxWidth, getPreferredHeight());
}
}
Now we can use it:
class Scr extends FullScreen implements FieldChangeListener {
LabelField mHeader;
ListManager mHFMList;
HorizontalFieldManager mHFMButton;
LabelListField mListField;
ButtonField mButton;
public Scr() {
super(DEFAULT_MENU | DEFAULT_CLOSE);
mHeader = new LabelField("List Field", FIELD_HCENTER);
add(mHeader);
Vector values = new Vector();
values.addElement("first");
values.addElement("second");
values.addElement("third");
values.addElement("fourth");
values.addElement("fifth");
values.addElement("sixth");
values.addElement("seventh");
values.addElement("eight");
mListField = new LabelListField(values);
mHFMList = new ListManager(mListField);
add(mHFMList);
mHFMButton = new HorizontalFieldManager(FIELD_HCENTER);
add(mHFMButton);
mButton = new ButtonField("Exit", ButtonField.CONSUME_CLICK);
mButton.setChangeListener(this);
mHFMButton.add(mButton);
}
public void fieldChanged(Field field, int context) {
if (mButton == field)
close();
}
}
Tested on eJDE 4.2.1.17 8800
all here's the solution that helped me. By overriding moveFocus in such specific way I managed to modify default behavior of scrolling in layout manager - it skips first items of list field allowing them to stay on top.
public int moveFocus(int amount, int status, int time) {
invalidate(getSelectedIndex());
int unused = super.moveFocus(amount, status, time);
return Math.abs(unused) + 1;
}