In my JavaFX application I use Pagination to show some pictures. Reading the pictures takes much time so I fill an ObservableList<Image> with placeholder images, which should be replaced by the originals when they are loaded.
Everything works fine, but the only thing is that the current page doesn't get updated when the image is loaded. I have to change the CurrentPageIndex and change back. Than the right picture is displayed.
For loading the images I've created a Task, so that I'm able to use the Application during the process.
So my Question is, how is it possible to update the content of the current page?
The PageFactory looks like that:
ImageView imageView = new ImageView();
Image img = images.get(index);
imageView.setImage(img);
imageView.setFitWidth(240);
imageView.setStyle("-fx-background-color: white");
imageView.setPreserveRatio(true);
imageView.setSmooth(true);
imageView.setCache(true);
imageView.setEffect(createShadow(Color.BLACK, false));
VBox pageBox = new VBox();
pageBox.setAlignment(Pos.CENTER);
pageBox.getChildren().add(imageView);
return pageBox;
Here I replace the images (first 2 lines are methods of a framework):
for (int i = 0; i < pageCount; i++) {
PagePainter pp = parser.getPagePainter(i);
BufferedImage buffImg = pp.getImage(200);
fxImages.set(i, SwingFXUtils.toFXImage(buffImg, null));
}
Related
Using Vaadin Flow Java API I would like to emulate a Vaadin 8 Window feature: particularly I need to emulate Caption behaviour.
I mean a fixed top "Title" not scrollable as the real content of the Dialog. Anyone can tell me some Example I could learn from ?
Thanks in advance
This is the workaround I found.
public MainView() {
Button button = new Button("Click me",
event -> {
Dialog dialog = new Dialog();
HorizontalLayout horizontalLayout = new HorizontalLayout();
VerticalLayout verticalLayout = new VerticalLayout();
Div headerDiv = new Div();
Div bodyDiv = new Div();
bodyDiv.getElement().getStyle().set("overflow", "auto");
bodyDiv.getElement().getStyle().set("max-height", "420px"); // !!!
dialog.add(headerDiv, bodyDiv);
headerDiv.add(horizontalLayout);
bodyDiv.add(verticalLayout);
horizontalLayout.add(new Label("Hi there !"));
for (int i = 1; i <= 20; i++) {
verticalLayout.add(new TextField("TextField_" + i));
}
dialog.open();
});
add(button);
}
The trouble is that I have to fix max-height size to avoid scrolling of all the contained components. So I cannot take advantage from the auto-size behaviour of the Dialog Container. Also tried using setFlexGrow, but I did not reach the solution.
Any Hint ?
In Vaadin 10+ there is no component called Window, but there is component called Dialog. It does not have Title like Window, but otherwise it has similar baseline. I.e. it is popup. Based on your question you have found already that.
Dialog itself is component container, which means you can add components there. I would just create e.g two Divs (the simplest of the layout components in Vaadin 10). I would style the first one to have fixed height and place the Title there. And then I would apply component.getElement().getStyle().set("overflow", "auto") to the other one, which is the actual content body. The mentioned style will enable the scrollable feature. You could potentially use VerticalLayout / HorizontalLayout instead of Div as well depending what you need.
See also: https://vaadin.com/docs/v10/flow/migration/5-components.html
How can I implement following design functionality with android standard component bottom sheet:
Image when Bottom sheet dialog fragment will appear:
Image when user scrolled to up to view bottom of content:
I will use ViewPager to scrolling header images and RecyclerView to showing descriptions and other informations. And parallax effect to ImageView(which are placed in ViewPager) when scrolling content vertically. Have a minimum height of the ImageView(and ViewPager), user can't collapse fully it (Look to second screenshot, which is user scrolled until the end of content).
I want stop scrolling ImageView when it will reach to minimum height(look to second one Screenshot), but the content of below ImageView should be continue scrolling
This can be done with an if statement in an on scroll view such as shown below:
ScrollView scrollView = findViewById(R.id.scrollView); //Adjust for your code
ImageView imageView = findViewById(R.id.imageView); //Adjust for your code
boolean imageIsHidden = false;
int threshold = 250;
scrollView.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener() {
#Override
public void onScrollChanged() {
int scrollY = rootScrollView.getScrollY();
if(scrollY >= threshold){
imageIsHidden = true;
//Move image outside of scroll view so it doesn't scroll
}
else if(scrollY < threshold && imageIsHidden){
imageIsHidden = false;
//Move image inside of scroll view so it does scroll
}
}
});
What this does is has a boolean called imageIsHidden and an integer called threshold. Threshold is where you want it to make it disappear. You will need to play around with this value to find a sweet spot.
You will also need to implement moving the image inside and outside of the scroll view as well in the if and if else statement.
I want to implement a list in Android that contains some customized views.
My problem is that I want the the views will be put one after the other with a little overlap between them. like in the following schema:
I also want to control this overlap in such a way that when the user clicks on one of the items, they will move apart from each other.
I tried to extend ListView but it seems to be very obscured, any suggestions?
Edit:
This can be more clear:
I did it by setting the divider height to -50dp.
this is exactly what I want to achieve, but somehow it doesn't reflect on my app.
I managed to achieve this by using scroll view with a single relative layout as a child.
I then dynamically place the views by defining a rule and margin:
for (int i = 0; i < 30; i++) {
TextView tv = new TextView(context);
tv.setText("Text \n Text" + i);
tv.setBackgroundColor(i % 2 == 0 ? Color.RED : Color.GREEN);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
lp.leftMargin = 0;
lp.topMargin = (i * 45);
rl.addView(tv, lp);
}
Later, you can control the positioning of the sub-views by changing their y value (for example: if you want to add animation).
This is the final result:
This can probably be achieved by using the Camera.setTranslate function. See Android: Vertical ListView with overlaped rows and Android: vertical 3d listview for similar questions (with solutions)
I am facing an issue with editor and its contents layout. Its following: there is an editor with print preview functionality, main part of the editor is taken by paper clips PrintPreview component, on the left side there is a composite with some buttons (see screenshot 1).
As you can see PrintPreview is located inside ScrolledComposite.
The problem is: when I am resizing window or views under editor, the bottom scrollbar moves under views and thus disappears. There is no way to scroll horizontally afterwards (no editor scrollbar appears). see screenshot2 (bottom scrollbar is getting hidden).
It starting to get hidden, when editor height is less then height of the right composite ( there are more widgets below the last button, I've just erased them)
If I am shrinking the window, then right composite never loses its width and always visible (see screenshot 3 - It does not allow to resize more than that).
The composites are created in the following way:
#Override
public void createPartControl(final Composite parent) {
GridLayout gridLayout = new GridLayout(2, false);
parent.setLayout(gridLayout);
// Scroll area for the print area
scroll = new ScrolledComposite(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
final GridData gridData = new GridData(GridData.FILL_BOTH);
gridData.grabExcessHorizontalSpace = true;
gridData.grabExcessVerticalSpace = true;
gridData.widthHint = 1;
gridData.heightHint = 1;
scroll.setLayoutData(gridData);
scroll.setExpandHorizontal(true);
scroll.setExpandVertical(true);
// Button area
final Composite buttonArea = new Composite(parent, SWT.FLAT);
final GridData layoutData = new GridData(SWT.FILL, SWT.TOP, false, false);
buttonArea.setLayoutData(layoutData);
gridLayout = new GridLayout(1, false);
buttonArea.setLayout(gridLayout);
The question is: how not to prevent disappearing of the bottom scrollbar? Can I have the same behavior as width the width of the right composite - It not possible to resize less then right composite height? Or how can I show scrollbar on the whole editor if some minimum height limit is exceeded?
I've tried different things on different composites, like setting minimumHeight and heightHint, putting buttonsArea into the scrolledcomposite (just for fun) etc. But nothing have helped me.
Does anybody knows fast solution? Thank you.
See this SO post: Prevent SWT scrolledComposite from eating part of it's children
You need to listen for width changes on the content composite
(mParent), compute the minimum height again given the new content
width, and call setMinHeight() on the scrolled composite with new
height.
If the above post is not as useful as it seems then share some minimal compiling and executable code to replicate the problem. Also, mention the eclipse/swt version, OS and JDK version, it helps in analyzing the problem.
Demo code for resize event and output !!
Code :
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class ScrolledCompositeTest
{
public static void main (String [] args)
{
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout(new FillLayout());
GridLayout layout = new GridLayout();
layout.numColumns = 4;
// set the minimum width and height of the scrolled content - method 2
final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
sc2.setExpandHorizontal(true);
sc2.setExpandVertical(true);
final Composite c2 = new Composite(sc2, SWT.NONE);
sc2.setContent(c2);
layout = new GridLayout();
layout.numColumns = 7;
c2.setLayout(layout);
Button b2 = new Button (c2, SWT.PUSH);
b2.setText("first button");
sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT));
Button add = new Button (shell, SWT.PUSH);
add.setText("add children");
final int[] index = new int[]{0};
add.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
index[0]++;
Button button = new Button(c2, SWT.PUSH);
button.setText("button "+index[0]);
sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT));
c2.layout();
}
});
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
Output:
Actual Size
Vertical Resize
Horizontal Resize
I have a view with 4 text boxes and and a logo at the top - when the user is entering information the text pad covers up some of these controls, how can I make the view scroll so that this isn't an issue.
I have tried adding the view to a UIScrollView but that doesn't seem to do anything?
I've included a snippit below of how I've handled your situation. If I'm understanding you correctly, you do not wish to have a scrollable view, rather you want to the view to move in conjunction with switching to and from fields to alleviate and visual hindrances caused by the keyboard.
Goodluck!
private void ScrollTheView(bool movedUp, float scrollamount, UIView ViewToMove)
{
//To invoke a views built-in animation behaviour,
//you create an animation block and
//set the duration of the move...
//Set the display scroll animation and duration...
UIView.BeginAnimations(string.Empty, System.IntPtr.Zero);
UIView.SetAnimationDuration(0.15);
//Get Display size...
RectangleF frame = ViewToMove.Frame;
if (movedUp) {
//If the view should be moved up,
//subtract the keyboard height from the display...
frame.Y -= scrollamount;
}
else {
//If the view shouldn't be moved up, restore it
//by adding the keyboard height back to the original...
frame.Y += scrollamount;
}
//Assign the new frame to the view...
ViewToMove.Frame = frame;
//Tell the view that your all done with setting
//the animation parameters, and it should
//start the animation...
UIView.CommitAnimations();
}
You need to set more to the UIScrollView than just put subviews in it. Set up the ContentSize property properly for the complete size of the subviews so the scrollview knows about the larger content in it, than you can control the scrolling position, zoom factor and so on.
There are plenty of samples on iOS SDK, just check the UIScrollView documentation, transformation to Monotouch from ObjectiveC is straightforward or check blog post at http://blog.touch4apps.com/home/iphone-monotouch-development/monotouch-infinite-loop-image-scroll-view where I have a sample with images autoscrolled in UIScrollView.
something like this.
textBox.EditingDidBegin += delegate {
var offset = scrollView.contentOffset;
offset.Y -= 200;
scrollView.contentOffset = offset;
}