I want to take a screen shot of a layout that is nested (in between) main layout. I'm using following code:
public static Bitmap captureScreen(View v) {
Bitmap bitmap = null;
try {
if (v != null) {
int width = v.getWidth();
int height = v.getHeight();
screenshot = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
v.draw(new Canvas(screenshot));
}
} catch (Exception e) {
Log.d("captureScreen", "Failed");
}
return bitmap;
}
on button click it would be like :
captureScreen(midlayout);
Related
In my android studio project I am trying to select an image from external storage via startActivityForResult and load the selected image into memory. Also I have a BitmapLoader helper class. Here is the piece of code where I call the activity to get the result
private void pickFromGallery() {
//Create an Intent with action as ACTION_PICK
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// Sets the type as image/*. This ensures only components of type image are selected
intent.setType("image/*");
//We pass an extra array with the accepted mime types. This will ensure only components with these MIME types as targeted.
String[] mimeTypes = {"image/jpeg", "image/png"};
intent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
// Launching the Intent
startActivityForResult(intent, GALLERY_REQUEST_CODE); //GALLERY_REQUEST_CODE is a constant integer
}
And here is the activity result callback
public void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result code is RESULT_OK only if the user selects an Image
if(resultCode == Activity.RESULT_OK) {
Bitmap imageBitmap = null;
switch(requestCode) {
case GALLERY_REQUEST_CODE:
//data.getData returns the content URI for the selected Image
File file = new File(data.getData().getPath());
try {
//BitmapLoader is my helper class
imageBitmap = BitmapLoader.decodeSampleBitmapFromFile(file, 100, 100);
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, "Error while reading a file!", Toast.LENGTH_SHORT).show();
return;
}
userImage.setImageBitmap(imageBitmap);
break;
}
}
}
Finally, here is the BitmapLoader helper class.
public class BitmapLoader {
private BitmapLoader() {}
private static Bitmap rotateImageIfRequired(Bitmap img, File file) throws IOException {
ExifInterface ei = new ExifInterface(file);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
return rotateImage(img, 90);
case ExifInterface.ORIENTATION_ROTATE_180:
return rotateImage(img, 180);
case ExifInterface.ORIENTATION_ROTATE_270:
return rotateImage(img, 270);
default:
return img;
}
}
private static Bitmap rotateImage(Bitmap img, int degree) {
Matrix matrix = new Matrix();
matrix.postRotate(degree);
Bitmap rotatedImg = Bitmap.createBitmap(img, 0, 0, img.getWidth(), img.getHeight(), matrix, true);
img.recycle();
return rotatedImg;
}
private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) >= reqHeight
&& (halfWidth / inSampleSize) >= reqWidth) {
inSampleSize += 1;
}
}
return inSampleSize;
}
public static Bitmap decodeSampleBitmapFromFile(File file, int reqWidth, int reqHeight) throws IOException {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(file.getPath(), options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(), options);
return rotateImageIfRequired(bitmap, file);
}
}
The problem is, when I call imageBitmap = BitmapLoader.decodeSampleBitmapFromFile(file, 100, 100); , it always throws an exception. I think the problem is the part where I create a File object from the Uri returned as a result. Can anyone please describe to me where the problem is coming from and help me write the correct code?
I found the right way to solve the problem. Here is the commented code describing the true way to solve the problem.
private void pickFromGallery() {
// intent with ACTION_OPEN_DOCUMENT to make
// content providers (gallery application, downloads application and so on)
// to show their files
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
//and that files must be openable
intent.addCategory(Intent.CATEGORY_OPENABLE);
//setting mime type to get only image files
intent.setType("image/*");
//just invoking intent
startActivityForResult(intent, GALLERY_REQUEST_CODE);
}
//getting picked image
public void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result code is RESULT_OK only if the user selects an Image
if(resultCode == Activity.RESULT_OK) {
Bitmap imageBitmap;
switch(requestCode) {
case GALLERY_REQUEST_CODE:
if(data == null) return;
//ParcelFileDescriptor allowing you to close it when done with it.
ParcelFileDescriptor parcelFileDescriptor;
try {
//a method to get file descriptor via Uri(data.getData() returns a Uri, "r" means for reading)
parcelFileDescriptor = getContentResolver().openFileDescriptor(data.getData(), "r");
//getting a descriptor from ParcelFileDescriptor
FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
// and sending that descriptor to BitmapLoader, which now takes only descriptor and required width and height to load bitmap
imageBitmap = BitmapLoader.decodeSampleBitmapFromDescriptor(fileDescriptor, 100, 100);
parcelFileDescriptor.close();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, "Error while reading a file!", Toast.LENGTH_SHORT).show();
return;
}
//here you can use the loaded bitmap as you like
userImage.setImageBitmap(imageBitmap);
break;
}
}
}
Finally the Bitmaploader class
public class BitmapLoader {
private BitmapLoader() {}
//this method uses ExifInterface to figure out how to rotate the image to bring it back to normal orientation, but that's another story.
private static Bitmap rotateImageIfRequired(Bitmap img, FileDescriptor descriptor) throws IOException {
ExifInterface ei = new ExifInterface(descriptor);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
return rotateImage(img, 90);
case ExifInterface.ORIENTATION_ROTATE_180:
return rotateImage(img, 180);
case ExifInterface.ORIENTATION_ROTATE_270:
return rotateImage(img, 270);
default:
return img;
}
}
//just a helper for the previous method
private static Bitmap rotateImage(Bitmap img, int degree) {
Matrix matrix = new Matrix();
matrix.postRotate(degree);
Bitmap rotatedImg = Bitmap.createBitmap(img, 0, 0, img.getWidth(), img.getHeight(), matrix, true);
img.recycle();
return rotatedImg;
}
// calculates how many times a bitmap should be reduced
private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) >= reqHeight
&& (halfWidth / inSampleSize) >= reqWidth) {
inSampleSize += 1;
}
}
return inSampleSize;
}
//main working method that throws an IOException because there might be problems reading the file
public static Bitmap decodeSampleBitmapFromDescriptor(#NonNull FileDescriptor descriptor, int reqWidth, int reqHeight) throws IOException {
// BitmapFactory.Options helps to load only the image information first.
final BitmapFactory.Options options = new BitmapFactory.Options();
// must set to true to load only the image information
options.inJustDecodeBounds = true;
/**null is just a padding*/
//loading into options the information about image
BitmapFactory.decodeFileDescriptor(descriptor, null, options);
// Calculation of the dimensions of the image for loading in accordance with the required width and height
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// now setting to false to load real bitmap with required dimensions
options.inJustDecodeBounds = false;
//decoding an image and returning a bitmap
Bitmap bitmap = BitmapFactory.decodeFileDescriptor(descriptor, null, options);
return rotateImageIfRequired(bitmap, descriptor);
}
}
It is very important to load the image into memory at a reduced size, because a bitmap of a real image may require over 500MB of RAM.
EDIT:: Reading through this again now realize it isn’t very clear as to how the pictures were captured, how they’re being displayed, and why/what makes them different.
To that end— We are using AVCapture library to manually take photos within our app. We have a preview display in the app so the user can see what the image they’re taking looks like, just how any standard photo app these days does it. So what these two images are showing are the preview of the image on the screen, before the image is captured and the captured image. This was done by taking a screenshot of the preview and then a screenshot of the resulting capture image.
All this to say the captured image appears to be returned with differing dimensions or scaling attributes. We are displaying the preview and the resulting captures using a native iOS preview view and a Xamarin.Image respectively.
Below details our attempts at addressing the issue by changing sizing, layering, and stretching attributes to no avail.
To that end we’ve created a support ticket with MSFT regarding this issue.
These two images are the camera preview and the resulting capture (in that order, respectively [taken via screenshots]). We want the captured photo to match the preview/vice versa. How can we address this?
Tried manipulating the CALayer containing the photo data to size the image like how a Xamarin.Forms' image sizes with AspectFit by assigning the ContentsGravity with various options like kCAGravityResizeAspect. Fiddled with other Contents options such as ContentsRect and ContentsScale but no dice. Below is the View and its corresponding Renderer. So how to address the sizing issue?
Native Camera View
namespace App.iOS.Views
{
public class NativeCameraView : UIView
{
AVCaptureVideoPreviewLayer previewLayer;
CameraOptions cameraOptions;
public AVCaptureSession CaptureSession { get; private set; }
public AVCaptureStillImageOutput CaptureOutput { get; set; }
public bool IsPreviewing { get; set; }
public NativeCameraPreview(CameraOptions options)
{
cameraOptions = options;
IsPreviewing = false;
Initialize();
}
public override void LayoutSubviews()
{
base.LayoutSubviews();
UIDevice device = UIDevice.CurrentDevice;
UIDeviceOrientation orientation = device.Orientation;
AVCaptureConnection previewLayerConnection = this.previewLayer.Connection;
if (previewLayerConnection.SupportsVideoOrientation)
{
switch (orientation)
{
case UIDeviceOrientation.Portrait:
UpdatePreviewLayer(previewLayerConnection,
AVCaptureVideoOrientation.Portrait);
break;
case UIDeviceOrientation.LandscapeRight:
UpdatePreviewLayer(previewLayerConnection,
AVCaptureVideoOrientation.LandscapeLeft);
break;
case UIDeviceOrientation.LandscapeLeft:
UpdatePreviewLayer(previewLayerConnection,
AVCaptureVideoOrientation.LandscapeRight);
break;
case UIDeviceOrientation.PortraitUpsideDown:
UpdatePreviewLayer(previewLayerConnection,
AVCaptureVideoOrientation.PortraitUpsideDown);
break;
default:
UpdatePreviewLayer(previewLayerConnection,
AVCaptureVideoOrientation.Portrait);
break;
}
}
}
private void UpdatePreviewLayer(AVCaptureConnection layer,
AVCaptureVideoOrientation orientation)
{
layer.VideoOrientation = orientation;
previewLayer.Frame = this.Bounds;
}
public async Task CapturePhoto()
{
var videoConnection = CaptureOutput.ConnectionFromMediaType(AVMediaType.Video);
var sampleBuffer = await CaptureOutput.CaptureStillImageTaskAsync(videoConnection);
var jpegData = AVCaptureStillImageOutput.JpegStillToNSData(sampleBuffer);
var photo = new UIImage(jpegData);
var rotatedPhoto = RotateImage(photo, 180f);
CALayer layer = new CALayer
{
//ContentsGravity = "kCAGravityResizeAspect",
//ContentsRect = rect,
//GeometryFlipped = true,
ContentsScale = 1.0f,
Frame = Bounds,
Contents = rotatedPhoto.CGImage //Contents = photo.CGImage,
};
MainPage.UpdateSource(UIImageFromLayer(layer).AsJPEG().AsStream());
MainPage.UpdateImage(UIImageFromLayer(layer).AsJPEG().AsStream());
}
public UIImage RotateImage(UIImage image, float degree)
{
float Radians = degree * (float)Math.PI / 180;
UIView view = new UIView(frame: new CGRect(0, 0, image.Size.Width, image.Size.Height));
CGAffineTransform t = CGAffineTransform.MakeRotation(Radians);
view.Transform = t;
CGSize size = view.Frame.Size;
UIGraphics.BeginImageContext(size);
CGContext context = UIGraphics.GetCurrentContext();
context.TranslateCTM(size.Width / 2, size.Height / 2);
context.RotateCTM(Radians);
context.ScaleCTM(1, -1);
context.DrawImage(new CGRect(-image.Size.Width / 2, -image.Size.Height / 2, image.Size.Width, image.Size.Height), image.CGImage);
UIImage imageCopy = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return imageCopy;
}
UIImage ImageFromLayer(CALayer layer)
{
UIGraphics.BeginImageContextWithOptions(
layer.Frame.Size,
layer.Opaque,
0);
layer.RenderInContext(UIGraphics.GetCurrentContext());
var outputImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return outputImage;
}
void Initialize()
{
CaptureSession = new AVCaptureSession();
CaptureSession.SessionPreset = AVCaptureSession.PresetPhoto;
previewLayer = new AVCaptureVideoPreviewLayer(CaptureSession)
{
Frame = Bounds,
VideoGravity = AVLayerVideoGravity.ResizeAspectFill
};
var videoDevices = AVCaptureDevice.DevicesWithMediaType(AVMediaType.Video);
var cameraPosition = (cameraOptions == CameraOptions.Front) ? AVCaptureDevicePosition.Front : AVCaptureDevicePosition.Back;
var device = videoDevices.FirstOrDefault(d => d.Position == cameraPosition);
if (device == null)
{
return;
}
NSError error;
var input = new AVCaptureDeviceInput(device, out error);
var dictionary = new NSMutableDictionary();
dictionary[AVVideo.CodecKey] = new NSNumber((int)AVVideoCodec.JPEG);
CaptureOutput = new AVCaptureStillImageOutput()
{
OutputSettings = new NSDictionary()
};
CaptureSession.AddOutput(CaptureOutput);
CaptureSession.AddInput(input);
Layer.AddSublayer(previewLayer);
CaptureSession.StartRunning();
IsPreviewing = true;
}
}
}
Native Camera Renderer
[assembly: ExportRenderer(typeof(CameraView), typeof(CameraViewRenderer))]
namespace App.iOS.Renderers
{
public class CameraViewRenderer : ViewRenderer<CameraView, NativeCameraView>
{
NativeCameraView uiCameraView;
protected override void OnElementChanged(ElementChangedEventArgs<CameraView> e)
{
base.OnElementChanged(e);
if (Control == null)
{
uiCameraView = new NativeCameraView(e.NewElement.Camera);
SetNativeControl(uiCameraView);
}
if (e.OldElement != null)
{
// Unsubscribe
uiCameraView.Tapped -= OnCameraViewTapped;
}
if (e.NewElement != null)
{
// Subscribe
uiCameraView.Tapped += OnCameraViewTapped;
}
}
async void OnCameraViewTapped(object sender, EventArgs e)
{
await uiCameraView.CapturePhoto();
}
}
}
NOTE A similar question appears to have been asked quite some time ago.
Hello am new to Android studio
I have made recylerview for transaction details . I need to create pdf for this recylerview items.
Example: I have 24 cardviews in recylerview so need to create pdf with each page 4 cardviews only . So totally I need to get pdf as 6 pages .
How to do that . Thanks in advance.
This is sample image of my view
Am passing below code
recyclerView.measure(View.MeasureSpec.makeMeasureSpec(recyclerView.getWidth(),View.MeasureSpec.EXACTLY),View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED));
Bitmap bm=Bitmap.createBitmap(recyclerView.getWidth(),recyclerView.getMeasuredHeight(),Bitmap.Config.ARGB_8888);
String mpath2="/mnt/sdcard/mathanpaymentpdf";
File imageFile = new File(mpath2);
PDFHelper pdfHelper = new PDFHelper(imageFile,this);
pdfHelper.saveImageToPDF(recyclerView,bm,"mathan"+System.currentTimeMillis());
public class PDFHelper {
private File mFolder;
private File mFile;
private Context mContext;
public PDFHelper(File folder, Context context) {
this.mContext = context;
this.mFolder = folder;
if(!mFolder.exists())
mFolder.mkdirs();
}
public void saveImageToPDF(View title, Bitmap bitmap, String filename) {
mFile = new File(mFolder, filename + ".pdf");
if (!mFile.exists()) {
int height = title.getHeight() + bitmap.getHeight();
PdfDocument document = new PdfDocument();
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(bitmap.getWidth(), height, 1).create();
PdfDocument.Page page = document.startPage(pageInfo);
Canvas canvas = page.getCanvas();
title.draw(canvas);
canvas.drawBitmap(bitmap, null, new Rect(0, title.getHeight(), bitmap.getWidth(),bitmap.getHeight()), null);
document.finishPage(page);
try {
mFile.createNewFile();
OutputStream out = new FileOutputStream(mFile);
document.writeTo(out);
document.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
This am tried am getting pdf on a single page only
Just I need to split into multiple pages.
Note: I need code in java, not in kotlin
Am solved this by using itext library
implementation 'com.itextpdf:itextpdf:5.0.6'
Then call with RecylerView
public void generatePDF(RecyclerView view) {
RecyclerView.Adapter adapter = view.getAdapter();
int sie2=adapter.getItemCount();
if (sie2 == 0) {
Toast.makeText(this,"No Transactions",Toast.LENGTH_LONG).show();
}else{
Bitmap bigBitmap = null;
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
bigCanvas.drawColor(Color.WHITE);
Document document=new Document();
final File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), "MAT"+System.currentTimeMillis()+".pdf");
try {
PdfWriter.getInstance(document, new FileOutputStream(file));
} catch (DocumentException | FileNotFoundException e) {
e.printStackTrace();
}
for (int i = 0; i < size; i++) {
try {
//Adding the content to the document
Bitmap bmp = bitmaCache.get(String.valueOf(i));
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
com.itextpdf.text.Image image= com.itextpdf.text.Image.getInstance(stream.toByteArray());
//Image image = Image.getInstance(stream.toByteArray());
float scaler = ((document.getPageSize().getWidth() - document.leftMargin()
- document.rightMargin() - 50) / image.getWidth()) * 100; // 0 means you have no indentation. If you have any, change it.
image.scalePercent(scaler);
image.setAlignment(com.itextpdf.text.Image.ALIGN_CENTER | com.itextpdf.text.Image.ALIGN_TOP);
if (!document.isOpen()) {
document.open();
}
document.add(image);
} catch (Exception ex) {
Log.e("TAG-ORDER PRINT ERROR", ex.getMessage());
}
}
if (document.isOpen()) {
document.close();
}
// Set on UI Thread
runOnUiThread(new Runnable() {
#Override
public void run() {
android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(MainActivityAdminMain.this);
builder.setTitle("Success")
.setMessage("PDF File Generated Successfully.")
.setIcon(android.R.drawable.ic_dialog_alert)
.setPositiveButton("Open", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// dialog.dismiss();
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(Uri.fromFile(file), "application/pdf");
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
Intent intent56 = Intent.createChooser(target, "Open File");
try {
startActivity(intent56);
} catch (ActivityNotFoundException e) {
Toast.makeText(MainActivityAdminMain.this,"No PDF Viewer Installed.",Toast.LENGTH_LONG).show();
}
}
}).show();
}
});
}}
}
100% working.. This helps to anyone needs
I am working on a GUI that displays an image of a floor plan (JLabel with ImageIcon) and a number of small icons (JLabels with ImageIcon) down the left hand side. The idea is to be able to select one of the icons and drag and drop it onto a position on the floor plan. My code is working fine except that when you drag an icon onto the floor plan, I need the original icon to remain in place, so it can be placed in several other positions on the floor plan if required. So I need to be able to clone the icon that I am moving when the mouse is pressed.
My code below shows a temp fix between the //******** markers but of course this only works correctly for the topmost icon. I need to somehow clone "Component comp" as a new JLabel.
Below is the relevant part of my code:
class MouseHandler extends MouseAdapter {
private Component dragComponent;
private Sidebar board;
private Point dragOffset;
public MouseHandler(Sidebar board) {
this.board = board;
}
public Sidebar getBoard() {
return board;
}
#Override
public void mousePressed(MouseEvent e) {
Component comp = getBoard().getComponentAt(e.getPoint());
if (comp != null) {
if (comp instanceof JLabel) {
//**************
String imagePath = "/Downlight 1.gif";
Image Images = new ImageIcon(this.getClass().getResource(imagePath)).getImage();
String path = "Images" + imagePath;
ImageIcon icon = new ImageIcon(path);
JLabel lbl = new JLabel(icon);
lbl.setBounds(22, 26, 36, 36);
lbl.setIcon(new ImageIcon(Images));
lbl.setOpaque(true);
Sidebar board = getBoard();
board.add(lbl, new Point(40, 44));
board.setComponentZOrder(lbl, 0);
//**************
dragComponent = comp;
dragOffset = new Point();
dragOffset.x = e.getPoint().x - comp.getX();
dragOffset.y = e.getPoint().y - comp.getY();
}
}
}
#Override
public void mouseDragged(MouseEvent e) {
if (dragComponent != null) {
board = getBoard();
Point dragPoint = new Point();
dragPoint.x = e.getPoint().x - dragOffset.x;
dragPoint.y = e.getPoint().y - dragOffset.y;
dragComponent.setLocation(dragPoint);
}
}
#Override
public void mouseReleased(MouseEvent e) {
if (dragComponent != null) {
dragComponent = null;
}
}
}
}
Thanks in advance for any help with this.
I found a solution that enabled me to copy the icon and bounds of the original JLabel to a new JLabel, which replaces the one being dragged:
#Override
public void mousePressed(MouseEvent e) {
Component comp = getBoard().getComponentAt(e.getPoint());
if (comp != null) {
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
ImageIcon icon = ((ImageIcon)label.getIcon());
Rectangle rect = label.getBounds();
JLabel lbl = new JLabel(icon);
lbl.setBounds(rect);
lbl.setVisible(true);;
lbl.setOpaque(true);
Mainpanel board = getBoard();
board.add(lbl);
board.setComponentZOrder(lbl, 0);
dragComponent = comp;
dragOffset = new Point();
dragOffset.x = e.getPoint().x - comp.getX();
dragOffset.y = e.getPoint().y - comp.getY();
}
}
}
JavaFX: Is it possible to bind TextArea height (row count) to the height of its content?
I would like to dynamically change height of TextArea while writing the text.
Have a look at JavaFX utility class. Although this is not a solution using binding, computeTextHeight(Font font, String text, double wrappingWidth) method can help you.
This is an exact, simple & working solution:
SimpleIntegerProperty count = new SimpleIntegerProperty(20);
int rowHeight = 10;
txtArea.prefHeightProperty().bindBidirectional(count);
txtArea.minHeightProperty().bindBidirectional(count);
txtArea.scrollTopProperty().addListener(new ChangeListener<Number>(){
#Override
public void changed(ObservableValue<? extends Number> ov, Number oldVal, Number newVal) {
if(newVal.intValue() > rowHeight){
count.setValue(count.get() + newVal.intValue());
}
}
});
Alternatively you can use lambdas to simply the syntax even further:
SimpleIntegerProperty count=new SimpleIntegerProperty(20);
int rowHeight = 10;
textArea.prefHeightProperty().bindBidirectional(count);
textArea.minHeightProperty().bindBidirectional(count);
textArea.scrollTopProperty().addListener((ov, oldVal, newVal) -> {
if(newVal.intValue() > rowHeight){
count.setValue(count.get() + newVal.intValue());
}
});
A solution that workq fine in javafx8 (hiding toolbar is inspired from JavaFX TextArea Hiding Scroll Bars):
class MyTextArea extends TextArea {
#Override
protected void layoutChildren() {
super.layoutChildren();
ScrollBar scrollBarv = (ScrollBar) this.lookup(".scroll-bar:vertical");
if (scrollBarv != null) {
System.out.println("hiding vbar");
((ScrollPane) scrollBarv.getParent()).setVbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
}
ScrollBar scrollBarh = (ScrollBar) this.lookup(".scroll-bar:horizontal");
if (scrollBarh != null) {
System.out.println("hiding hbar");
((ScrollPane) scrollBarh.getParent()).setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
}
}
#Override
protected double computePrefWidth(double width) {
Bounds bounds = getTextBounds();
Insets insets = getInsets();
double w = Math.ceil(bounds.getWidth() + insets.getLeft() + insets.getRight());
return w;
}
#Override
protected double computePrefHeight(double height) {
Bounds bounds = getTextBounds();
Insets insets = getInsets();
double h = Math.ceil(bounds.getHeight() + insets.getLeft() + insets.getRight());
return h;
}
//from https://stackoverflow.com/questions/15593287/binding-textarea-height-to-its-content/19717901#19717901
public Bounds getTextBounds() {
//String text = (textArea.getText().equals("")) ? textArea.getPromptText() : textArea.getText();
String text = "";
text = this.getParagraphs().stream().map((p) -> p + "W\n").reduce(text, String::concat);
text += "W";
helper.setText(text);
helper.setFont(this.getFont());
// Note that the wrapping width needs to be set to zero before
// getting the text's real preferred width.
helper.setWrappingWidth(0);
return helper.getLayoutBounds();
}
}