How do i set zoom in and zoom out when click on imageview?I want my program to react when user click on imageview must get large to some extent and can move imageview on that screen and sometime it reduce the size along when it move on touch anywhere on the screen .when click again is go resume original size what do i do?
As far as I know there are two ways.
The first way:
Make a new folder in res called 'anim'. Than make a xml file inside, for example zoomin.xml. Afterwards put the following code inside.
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXScale="1"
android:toXScale="5"
android:fromYScale="1"
android:toYScale="5"
android:pivotX="50%"
android:pivotY="50%"
android:duration="1000"
android:fillAfter="true">
</scale>
Make another one for zoom out, but with reversed values.
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXScale="5"
android:toXScale="1"
android:fromYScale="5"
android:toYScale="1"
android:pivotX="50%"
android:pivotY="50%"
android:duration="1000"
android:fillAfter="true">
</scale>
You can change the values according to your needs. I think that they are self-explanatory.
And now in your java code.
ImageView imageView = (imageView)findViewById(R.id.yourImageViewId);
Animation zoomin = AnimationUtils.loadAnimation(this, R.anim.zoomin);
Animation zoomout = AnimationUtils.loadAnimation(this, R.anim.zoomout);
imageView.setAnimation(zoomin);
imageView.setAnimation(zoomout);
Now you only need to keep track which is the current state. And for each state execute this lines of codes:
imageView.startAnimation(zoomin);
and
imageView.startAnimation(zoomout);
For example:
imageView.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
if(!pressed) {
v.startAnimation(zoomin);
pressed = !pressed;
} else {
v.startAnimation(zoomout);
pressed = !pressed;
}
}
});
The other way is described here : http://developer.android.com/training/animation/zoom.html.
You can make this by following this guide easily
http://developer.android.com/training/animation/zoom.html
shortly you should use third imageview which is invisible when the user touches any imageview you want, you can display it by using animation in the imageview which is invisible.
Related
I face an issue which stucks for days. I am createing a tvos application which reqiures a custome navigationlink(button), when I move the focus to the navigation item, it should scale a little bit, and also I need to change the parent's view backgound. It is pretty simple, but it seems that the focusabe override the my custome button Style. The test shows that the background image was changed but without any scale effect when the navigationbutton get focused. Any suggestion?
NavigationLink(destination: Text("myview"))
{Text("Test")
}
.buttonStyle(myButtonStyle())
.Focusable(true){(focus) in
//the code to change the background image
//myButtonStyle definition
struct MyButtonStyle: ButtonStyle {
func makeBody(configuration: Configuration) -> some View {
return AppButton(configuration: configuration)
}
}
struct AppButton: View {
#Environment(\.isFocused) var focused: Bool
let configuration: ButtonStyle.Configuration
var body: some View {
configuration.label
.scaleEffect(focused ? 1.1 : 1.0)
.focusable(true)
}
}
The line to change the background image is always called when the item get focused as my expected, but the scale effect is gone. If I remove the following line of codes, the scale effect is back:
// .Focusable(true){(focus) in
//the code to change the background image
// }
It looks like that this line of code override my custome style of navigation button, any ideas? Appreciate any help!
Ah, finally I found the tricky, though there is very little document about this. When Focusable was introduced, it should not be in your code to change focus engine, which will cause the navigationlink tap message uncaptured, then your navigationlink for another view will not work.
Use .onChange() function to deal with any focus change event, not use Focusable.
I have a user interface with:
N.1 Push button (used to upload images)
N.2 QGraphicsView (left and right)
N.1 Push button that takes a print screen of the current image loaded on QGraphicsView left
Using the mouse is possible to:
1) zoom-in/zoom-out from the image
2) draw rectangles on the image.
I want to take the print screen of the image according to the zoom-in or zoom-out area I am using. However, once the file is saved it shows the entire image (wrong because I wanted only the enlarged or shrank part) with the rectangles drawn (this is correct).
According to this post QFileDialog was used in a similar way I am trying to do. I successfully used QFileDialog::getSaveFileName() to save the image. However it is not entirely solving the problem.
Below the pushbutton that takes care of taking the print screen of the image in the QGraphicsView left:
void MainWindow::on_addNewRecordBtn_clicked()
{
leftScene->clearSelection(); // Selections would also render to the file
leftScene->setSceneRect(leftScene->itemsBoundingRect()); // Re-shrink the scene to it's bounding contents
QImage image(leftScene->sceneRect().size().toSize(), QImage::Format_ARGB32); // Create the image with the exact size of the shrunk scene
image.fill(Qt::transparent); // Start all pixels transparent
QPainter painter(&image);
leftScene->render(&painter);
image.save(QFileDialog::getSaveFileName(this, tr("New Image Name"), QDir::rootPath(),
"Name (*.jpg *.jpeg *.png *.tiff *.tif)"));
}
The expected result would be saving the zoomed image (zoom.jpg for example) like this:
However when I save the image (zoom.jpg) the result that I am obtaining is constantly the entire image with the drawn features:
So if anyone needs, it is possible to take a print screen of an image no matter what the zoom in. Meaning you can zoom-in and zoom-out and take a print screen.
The following statement will do the job, grabbing the image your present (zoomed in or out status):
QImage image = ui->leftView->grab().toImage();
The only glitch is that the scroll bars horizontal and vertical (depending on the zoom) are also printed in your image. You can avoid that by setting them off right before taking the print screen and putting them back on right after.
Basically my previous function can be better written as follows:
void MainWindow::on_addNewRecordBtn_clicked()
{
leftScene->setSceneRect(leftScene->itemsBoundingRect());
// Setting off the scroll bars
ui->leftView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->leftView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
QImage image = ui->leftView->grab().toImage();
image.save(QFileDialog::getSaveFileName(this, tr("New Image Name"), QDir::rootPath(),
"Name (*.jpg *.jpeg *.png *.tiff *.tif)"));
// Putting the scroll bars back on
ui->leftView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
ui->leftView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
}
Hope this will be helpful in case you encountered my same problem.
I have been trying to focus the first button but focus engine takes the third button right below the tab bar as the first item to be focussed. I tried with preferred focus view but found that when i place the buttons in vertical order then preferred takes the preferred view to be focussed but when i placed all the buttons in horizontal plane it always takes the third button.The other approach i can think of if Focus Guide but i wonder how that will work in this scenario?
override weak var preferredFocusedView: UIView? {
get {
return thrirdButton
}
}
It happens because focus engine takes the nearest possible focus element as 1st element as you can see from the picture attached.I have attached the context screenshot for the view controller. Any help or clue to solve this will be appreciated.
Solution :
We need to add focus guide just above button 3 and redirect it to button one when the focus guide is focussed.
private var focusGuide = UIFocusGuide()
self.view.addLayoutGuide(focusGuide)
self.focusGuide.bottomAnchor.constraintEqualToAnchor(self.button3.topAnchor).active = true
self.focusGuide.leftAnchor.constraintEqualToAnchor(self.button3.leftAnchor).active = true
// Width and height
self.focusGuide.widthAnchor.constraintEqualToAnchor(self.button3.widthAnchor).active = true
self.focusGuide.heightAnchor.constraintEqualToAnchor(self.button3.heightAnchor).active = true
focusGuide.centerXAnchor.constraintEqualToAnchor(self.button3.centerXAnchor).active = true
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
self.focusGuide.preferredFocusedView = button1
}
Try adding a UIFocusGuide just above the button rows. In that case, before reaching the button, it will hit your focus guide in which you can redirect the preferredFocusedView to that particular button. The code to redirect is to be done by overriding didUpdateFocusInContext method.
Assuming you have setup the focus guide in viewDidload, the following is a sample,
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
super.didUpdateFocusInContext(context, withAnimationCoordinator: coordinator)
self.focusGuide.preferredFocusedView = self.mypreferredbutton
}
TO initialise a focus guide ( Do the addition of guide to view in viewDidLoad)
var focusGuide = UIFocusGuide()
self.view.addLayoutGuide(self.sidefocusGuide)
self.focusGuide.leftAnchor.constraintEqualToAnchor(self.placerLabel.leftAnchor).active = true
self.focusGuide.rightAnchor.constraintEqualToAnchor(self.placerLabel.rightAnchor).active = true
self.focusGuide.topAnchor.constraintEqualToAnchor(self.audioTable.topAnchor).active = true
I too faced a similar issue but somehow able to do it through this. The preferredFocusedView approach will also work, but you have to do lot of circus by updating some reference variable and then calling setneedsfocusupdate for that view. Try the focus guide way. Hope it helps.
EDITED:
I have added code how to setup the guide. In this case I have put the guide on the right side of my view. So, whenever your focus hits the guide, it redirects to the preferredfocusguide view that you want the focus to go to in the didUpdateFocusInContext. "There is only one view in focus at anytime.", remember thes ? So, the moment it hits the guide, the overriden method gets hit which in turn moves your focus to the guide's preferred view. For examples, you can refer to Apple's UIKitCatlog app for tvOS and here is one link explaining the same.
The best way to give the initial focus to your preferred view is by using preferredFocusEnivronments.
override var preferredFocusEnvironments: [UIFocusEnvironment] {
return [firstButton]
}
preferredFocusEnvironments will be called before didUpdateFocus, that way you can inform the system, where you want the focus to be redirected.
I am trying to move an object in a page form top to down on user finger movement using translate transform. we should see page contents as the bar goes down the page and sits at bottom.
Just like Action Center in windows phone 8.1.
Please let me know any ideas how we can design. Thanks.
Good question!
My first thought was to do something like this.
You could get the touch input location and then move a rectangle from the top of the screen and translate it down according to they Y Cord of the Touch Input.
EDIT:
Okay so here is what you can do.
Create a Canvas and position it somewhere at the top ( i gave it the height of 14 in collapsed state).
Then create a private void cn_ManipulationDelta(object sender, System.Windows.Input.ManipulationDeltaEventArgs e) event and make it set the height of the Canvas. I also included a float i to later make it snap back or cover the entire screen if the user lets go during the pull-event.
private void cn_ManipulationDelta(object sender, System.Windows.Input.ManipulationDeltaEventArgs e)
{
cn.Height += e.DeltaManipulation.Translation.Y;
i = (float)e.CumulativeManipulation.Translation.Y;
}
And thats it. You can also add this event to make it snap back or go cover the full screen when the user lets go.
private void cn_ManipulationCompleted(object sender, System.Windows.Input.ManipulationCompletedEventArgs e)
{
if(i < 100)
{
cn.Height = 14;
}
else
{
cn.Height = Application.Current.Host.Content.ActualHeight;
}
}
Of course you can add smoother animations so it slowly goes back into the collapsed view or fills the entire page.
I hope this helps!
i want to show the thumbnail of the previous image taken by camera instead of the cancel button while camera is running ...
Is that possible ?? Need help ..
Yep. Just capture the last image, keep it in memory (or save it to disk), then use it as one of the controls. We can do this using the overlay property of the Titanium.Media.showCamera function. Here is a quick example:
First we need an overlay view to show the image.
var overlayView = Ti.UI.createView();
var imageView = Ti.UI.createImageView({
width:44,
height:44,
left : 5
});
overlayView.add(imageView);
Now this is the function we use to open the camera with the overlay view. Note that we don't have controls so you need to add those (for closing etc). All we do right now is set the overlays image.
Titanium.Media.showCamera({
success:function(event) {
// called when media returned from the camera
imageView.image = event.media;
},
cancel:function() {},
error:function(error) {},
saveToPhotoGallery:true,
allowEditing:true,
mediaTypes:[Ti.Media.MEDIA_TYPE_PHOTO],
overlay : overlayView,
showControls: false // This is important!
});
To really make this work, you may need to save the event.media in a global variable, or use a similiar technique make sure overlayView will not be nulled out / garbage collected.
Also this is a barebones solution, not very robust, but this is the basic method I would use!