How do I animate an object of a class, that is inherited from ImageView, from within the class definition?
My Code:
public class CustomImageView extends ImageView{
public CustomImageView(String imageLocation){
this.setImage(new Image(imageLocation));
FadeTransition fadeIn = new FadeTransition();
fadeIn.setDuration(new Duration(2000));
fadeIn.setFromValue(0);
fadeIn.setToValue(1);
fadeIn.setNode(this);
fadeIn.play();
fadeIn.setOnFinished(ae->System.out.println("Finished!"));
}
}
The code displays the message when the animation is finished but the node itself is not animated.
Although your code should theoretically work, a slightly better approach would be:
public class CustomImageView extends ImageView {
public CustomImageView(String imageLocation){
this.setImage(new Image(imageLocation));
this.setOpacity(0); // completely transparent when created
}
// can play anytime on demand
public void playFadeInAnimation(Runnable action) {
FadeTransition fadeIn = new FadeTransition(Duration.seconds(2), this);
fadeIn.setFromValue(0);
fadeIn.setToValue(1);
fadeIn.setOnFinished(e -> action.run());
fadeIn.play();
}
}
Somewhere else, where you are using the CustomImageView
CustomImageView view = new CustomImageView(...);
someParent.getChildren().add(view); // display on screen
view.playFadeInAnimation(...); // play animation
Related
I have a textview and a button on screen. User taps on the text view which shows up keyboard, user types some text and then clicks on the button whose onclick is bound to a command defined in the view model.
I want to dismiss keyboard from view model by sending a message or calling a method in the view but still want to keep loose coupling between view and view model. I see mvvmmessenger, mvxinteraction etc to accomplish this. What is the best way to handle this?
Don't know if this is the best way to handle this, but hopefully the way i did it can help you out.
I made an interface called IPlatformAction in the Core project, which implements a method called DismissKeyboard.
public interface IPlatformAction
{
void DismissKeyboard();
}
Then I made a service called PlatformActionService in the Droid project, that implements that interface.
public class PlatformService : IPlatformAction
{
protected Activity CurrentActivity =>
Mvx.IoCProvider.Resolve<IMvxAndroidCurrentTopActivity>().Activity;
public void DismissKeyboard()
{
var currentFocus = CurrentActivity.CurrentFocus;
if (currentFocus != null)
{
InputMethodManager inputMethodManager = (InputMethodManager)CurrentActivity.GetSystemService(Context.InputMethodService);
inputMethodManager.HideSoftInputFromWindow(currentFocus.WindowToken, HideSoftInputFlags.None);
}
}
}
Lastly, I inject the interface in the viewmodel and call the dismiss keyboard method
public class SomeViewModel : BaseViewModel<SomeModel>
{
private readonly IPlatformAction _platformAction;
public SomeViewModel(IPlatformAction platformAction)
{
_platformAction = platformAction;
}
public async Task DoSomething()
{
//Some code
_platformAction.DismissKeyboard();
}
}
I'm working with ZK Framework and I need to generate a <listbox> with an 'ListItemRenderer' I'm implementing. The problem is that I need to generate a button inside the renderer pointing to a Composer's method with the onClick event. Here is the code:
ZUL
<window id="mywin" apply="pkg.MyComposer">
<listbox id="mylbx"
model="#{mywin$MyComposer.action}"
itemRenderer="pkg.MyRenderer">
<listhead>
<listheader .../>
...
</listhead>
</listbox>
...
</window>
Composer
package pkg
public class MyComposer extends SelectorComposer<Window> {
#Wire("#mylbx")
private Listbox listbox;
public void action() {
// do some work, added a breakpoint in the first statement
}
Renderer
package pkg
public class MyRenderer implements ListitemRenderer<MyItem> {
#Override
public void render(Listitem item, MyItem data, int index) throws Exception {
// Some rendering...
Listcell actionCell = new Listcell();
this.addButton(actionCell, "Action 1", "btn_action1", index, "50%",
"onClick=mywin$MyComposer.action");
// another button (doesn't matter) ...
actionCell.setParent(item);
}
private void addButton(Listcell parent,
String label,
String id,
int index,
String width,
String forwardAction) {
Button btn = new Button(label);
btn.setId(id + "_" + index);
btn.setClass(id); // Second try
btn.setWidth(width);
ComponentsCtrl.applyForward(btn, forwardAction); // First try
btn.setParent(parent);
}
}
To test if action() is called, I added a breakpoint with my IDE in the first statement of the method, as I say in the comment.
My first try was to add a forward action in addButton(). I took that from another renderer where it was applied to a Span component, but action() was never called.
The second try was to define a class attribute for the button (so every button of the same type gets the same class) and to add an annotation to action() like this:
#Listen("onClick = .btn_action1")
public void actiion() {...}
but the result is the same.
I'm thinking that I need to add an EventListener to the button or to the composer but I don't know how to point to the correct method between the composer and the renderer.
Any help and/or guide is appreciated. Thanks in advance for your answers.
The best way to make this generic is to make a constructor who takes the composer as argument.
Of course, not every composer has that method so you need to create a interface what you will set on the composer.
public interface ButtonListboxRenderer {
void onClickListboxButton(); // of course with return type and arguments you need.
}
Then your renderer :
public class MyRenderer implements ListitemRenderer<MyItem> {
private final ButtonListboxRenderer composer;
public MyRenderer(ButtonListboxRenderer composer) {
this.composer = composer;
}
...
private void addButton(Listcell parent,
String label,
String id,
int index,
String width,
String forwardAction) {
Button btn = new Button(label);
btn.setId(id + "_" + index);
btn.setClass(id); // Second try
btn.setWidth(width);
// add eventlistener to the button and you can point to the method of the composer.
btn.setParent(parent);
}
}
I'm making an app with using Xamarin.forms.
You might know forms' button is not enough to use as image button if you tried one.
So I use Image as a button and add gesturerecogniger. It's working fine.
Good thing is that I can use all Image's bindable property same like using Image. (like 'Aspect property' and else)
Only problem is that Android button has sound effect when it's pressed.
Mine doesn't have.
How to play default button sound on Android?
[another try]
I tried to make layout and put Image and empty dummy button on it.
But If I do this, I can't use any property of Image or Button unless I manually link it.
So I think it's not the right way.
Thanks.
Xamarin.Android:
var root = FindViewById<View>(Android.Resource.Id.Content);
root.PlaySoundEffect(SoundEffects.Click);
Android playSoundEffect(int soundConstant)
Xamarin.iOS
UIDevice.CurrentDevice.PlayInputClick();
Xamarin.Forms via Dependency Service:
public interface ISound
{
void KeyboardClick () ;
}
And then implement the platform specific function.
iOS:
public void KeyboardClick()
{
UIDevice.CurrentDevice.PlayInputClick();
}
Android:
public View root;
public void KeyboardClick()
{
if (root == null)
{
root = FindViewById<View>(Android.Resource.Id.Content);
}
root.PlaySoundEffect(SoundEffects.Click);
}
Xamarin Forms:
PCL interface:
interface ISoundService { void Click(); }
Click handler:
void Handle_OnClick(object sender, EventArgs e) {
DependencyService.Get<ISoundService>().Click();
}
Android:
public class MainActivity {
static MainActivity Instance { get; private set; }
OnCreate() {
Instance = this;
}
}
class SoundService : ISoundService {
public void Click() {
var activity = MainActivity.Instance;
var view = activity.FindViewById<View>(
Android.Resource.Id.Content);
view.PlaySoundEffect(SoundEffects.Click);
}
}
Take a look at the following:
MonoTouch.UIKit.IUIInputViewAudioFeedback
Interface that, together with the UIInputViewAudioFeedback_Extensions class, comprise the UIInputViewAudioFeedback protocol.
See Also: IUIInputViewAudioFeedback
https://developer.xamarin.com/api/type/MonoTouch.UIKit.IUIInputViewAudioFeedback/
You'll want something like this (untested):
public void SomeButtonFunction()
{
SomeBtn.TouchUpInside += (s, e) => {
UIDevice.CurrentDevice.PlayInputClick();
};
}
I have the following code in my Android app, it basically uses one page (using a NavigationDrawer) and swaps fragments in/out of the central view. This allows the navigation to occur on one page instead of many pages:
Setup.cs:
protected override IMvxAndroidViewPresenter CreateViewPresenter()
{
var customPresenter = new MvxFragmentsPresenter();
Mvx.RegisterSingleton<IMvxFragmentsPresenter>(customPresenter);
return customPresenter;
}
ShellPage.cs
public class ShellPage : MvxCachingFragmentCompatActivity<ShellPageViewModel>, IMvxFragmentHost
{
.
.
.
public bool Show(MvxViewModelRequest request, Bundle bundle)
{
if (request.ViewModelType == typeof(MenuContentViewModel))
{
ShowFragment(request.ViewModelType.Name, Resource.Id.navigation_frame, bundle);
return true;
}
else
{
ShowFragment(request.ViewModelType.Name, Resource.Id.content_frame, bundle, true);
return true;
}
}
public bool Close(IMvxViewModel viewModel)
{
CloseFragment(viewModel.GetType().Name, Resource.Id.content_frame);
return true;
}
.
.
.
}
How can I achieve the same behavior in a Windows UWP app? Or rather, is there ANY example that exists for a Windows MvvmCross app which implements a CustomPresenter? That may at least give me a start as to how to implement it.
Thanks!
UPDATE:
I'm finally starting to figure out how to go about this with a customer presenter:
public class CustomPresenter : IMvxWindowsViewPresenter
{
IMvxWindowsFrame _rootFrame;
public CustomPresenter(IMvxWindowsFrame rootFrame)
{
_rootFrame = rootFrame;
}
public void AddPresentationHintHandler<THint>(Func<THint, bool> action) where THint : MvxPresentationHint
{
throw new NotImplementedException();
}
public void ChangePresentation(MvxPresentationHint hint)
{
throw new NotImplementedException();
}
public void Show(MvxViewModelRequest request)
{
if (request.ViewModelType == typeof(ShellPageViewModel))
{
//_rootFrame?.Navigate(typeof(ShellPage), null); // throws an exception
((Frame)_rootFrame.UnderlyingControl).Content = new ShellPage();
}
}
}
When I try to do a navigation to the ShellPage, it fails. So when I set the Content to the ShellPage it works, but the ShellPage's ViewModel is not initialized automatically when I do it that way. I'm guessing ViewModels are initialized in MvvmCross using OnNavigatedTo ???
I ran into the same issue, and built a custom presenter for UWP. It loans a couple of ideas from an Android sample I found somewhere, which uses fragments. The idea is as follows.
I have a container view which can contain multiple sub-views with their own ViewModels. So I want to be able to present multiple views within the container.
Note: I'm using MvvmCross 4.0.0-beta3
Presenter
using System;
using Cirrious.CrossCore;
using Cirrious.CrossCore.Exceptions;
using Cirrious.MvvmCross.ViewModels;
using Cirrious.MvvmCross.Views;
using Cirrious.MvvmCross.WindowsUWP.Views;
using xxxxx.WinUniversal.Extensions;
namespace xxxxx.WinUniversal.Presenters
{
public class MvxWindowsMultiRegionViewPresenter
: MvxWindowsViewPresenter
{
private readonly IMvxWindowsFrame _rootFrame;
public MvxWindowsMultiRegionViewPresenter(IMvxWindowsFrame rootFrame)
: base(rootFrame)
{
_rootFrame = rootFrame;
}
public override async void Show(MvxViewModelRequest request)
{
var host = _rootFrame.Content as IMvxMultiRegionHost;
var view = CreateView(request);
if (host != null && view.HasRegionAttribute())
{
host.Show(view as MvxWindowsPage);
}
else
{
base.Show(request);
}
}
private static IMvxWindowsView CreateView(MvxViewModelRequest request)
{
var viewFinder = Mvx.Resolve<IMvxViewsContainer>();
var viewType = viewFinder.GetViewType(request.ViewModelType);
if (viewType == null)
throw new MvxException("View Type not found for " + request.ViewModelType);
// Create instance of view
var viewObject = Activator.CreateInstance(viewType);
if (viewObject == null)
throw new MvxException("View not loaded for " + viewType);
var view = viewObject as IMvxWindowsView;
if (view == null)
throw new MvxException("Loaded View is not a IMvxWindowsView " + viewType);
view.ViewModel = LoadViewModel(request);
return view;
}
private static IMvxViewModel LoadViewModel(MvxViewModelRequest request)
{
// Load the viewModel
var viewModelLoader = Mvx.Resolve<IMvxViewModelLoader>();
return viewModelLoader.LoadViewModel(request, null);
}
}
}
IMvxMultiRegionHost
using Cirrious.MvvmCross.ViewModels;
using Cirrious.MvvmCross.WindowsUWP.Views;
namespace xxxxx.WinUniversal.Presenters
{
public interface IMvxMultiRegionHost
{
void Show(MvxWindowsPage view);
void CloseViewModel(IMvxViewModel viewModel);
void CloseAll();
}
}
RegionAttribute
using System;
namespace xxxxx.WinUniversal.Presenters
{
[AttributeUsage(AttributeTargets.Class)]
public sealed class RegionAttribute
: Attribute
{
public RegionAttribute(string regionName)
{
Name = regionName;
}
public string Name { get; private set; }
}
}
These are the three foundational classes you need. Next you'll need to implement the IMvxMultiRegionHost in a MvxWindowsPage derived class.
This is the one I'm using:
HomeView.xaml.cs
using System;
using System.Diagnostics;
using System.Linq;
using Windows.Foundation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
using Cirrious.MvvmCross.ViewModels;
using Cirrious.MvvmCross.WindowsUWP.Views;
using xxxxx.Shared.Controls;
using xxxxx.WinUniversal.Extensions;
using xxxxx.WinUniversal.Presenters;
using xxxxx.Core.ViewModels;
namespace xxxxx.WinUniversal.Views
{
public partial class HomeView
: MvxWindowsPage
, IMvxMultiRegionHost
{
public HomeView()
{
InitializeComponent();
}
// ...
public void Show(MvxWindowsPage view)
{
if (!view.HasRegionAttribute())
throw new InvalidOperationException(
"View was expected to have a RegionAttribute, but none was specified.");
var regionName = view.GetRegionName();
RootSplitView.Content = view;
}
public void CloseViewModel(IMvxViewModel viewModel)
{
throw new NotImplementedException();
}
public void CloseAll()
{
throw new NotImplementedException();
}
}
}
The last piece to make this work is the way the actual xaml in the view is set-up. You'll notice that I'm using a SplitView control, and that I'm replacing the Content property with the new View that's coming in in the ShowView method on the HomeView class.
HomeView.xaml
<SplitView x:Name="RootSplitView"
DisplayMode="CompactInline"
IsPaneOpen="false"
CompactPaneLength="48"
OpenPaneLength="200">
<SplitView.Pane>
// Some ListView with menu items.
</SplitView.Pane>
<SplitView.Content>
// Initial content..
</SplitView.Content>
</SplitView>
EDIT:
Extension Methods
I forgot to post the two extension methods to determine if the view declares a [Region] attribute.
public static class RegionAttributeExtentionMethods
{
public static bool HasRegionAttribute(this IMvxWindowsView view)
{
var attributes = view
.GetType()
.GetCustomAttributes(typeof(RegionAttribute), true);
return attributes.Any();
}
public static string GetRegionName(this IMvxWindowsView view)
{
var attributes = view
.GetType()
.GetCustomAttributes(typeof(RegionAttribute), true);
if (!attributes.Any())
throw new InvalidOperationException("The IMvxView has no region attribute.");
return ((RegionAttribute)attributes.First()).Name;
}
}
Hope this helps.
As the link to the blog of #Stephanvs is no longer active I was able to pull the content off the Web Archive, i'll post it here for who ever is looking for it:
Implementing a Multi Region Presenter for Windows 10 UWP and MvvmCross
18 October 2015 on MvvmCross, Xamarin, UWP, Windows 10, Presenter > Universal Windows Platform
I'm upgrading a Windows Store app to the new Windows 10 Universal
Windows Platform. MvvmCross has added support for UWP in v4.0-beta2.
A new control in the UWP is the SplitView control. Basically it
functions as a container view which consist of two sub views, shown
side-by-side. Mostly it's used to implement the (in)famous hamburger
menu.
By default MvvmCross doesn't know how to deal with the SplitView, and
just replaces the entire screen contents with a new View when
navigating between ViewModels. If however we want to lay-out our views
differently and show multiple views within one window, we need a
different solution. Luckily we can plug-in a custom presenter, which
will take care of handling the lay-out per platform.
Registering the MultiRegionPresenter
In the Setup.cs file in your UWP project, you can override the
CreateViewPresenter method with the following implementation.
protected override IMvxWindowsViewPresenter CreateViewPresenter(IMvxWindowsFrame rootFrame)
{
return new MvxWindowsMultiRegionViewPresenter(rootFrame);
}
Using Regions
We can define a region by declaring a
element. At this point it has to be a Frame type because then we can
also show a nice transition animation when switching views.
<mvx:MvxWindowsPage ...>
<Grid>
<!-- ... -->
<SplitView>
<SplitView.Pane>
<!-- Menu Content as ListView or something similar -->
</SplitView.Pane>
<SplitView.Content>
<Frame x:Name="MainContent" />
</SplitView.Content>
</SplitView>
</Grid>
</mvx:MvxWindowsPage>
Now we want to be able when a ShowViewModel(...) occurs to swap out
the current view presented in the MainContent frame.
Showing Views in a Region
In the code-behind for a View we can now declare a MvxRegionAttribute,
defining in which region we want this View to be rendered. This name
has to match a Frame element in the view.
[MvxRegion("MainContent")]
public partial class PersonView
{
// ...
}
It's also possible to declare multiple regions within the same view.
This would allow you to split up your UI in more re-usable pieces.
Animating the Transition between Content Views
If you want a nice animation when transitioning between views in the
Frame, you can add the following snippet to the Frame declaration.
<Frame x:Name="MainContent">
<Frame.ContentTransitions>
<TransitionCollection>
<NavigationThemeTransition>
<NavigationThemeTransition.DefaultNavigationTransitionInfo>
<EntranceNavigationTransitionInfo />
</NavigationThemeTransition.DefaultNavigationTransitionInfo>
</NavigationThemeTransition>
</TransitionCollection>
</Frame.ContentTransitions>
</Frame>
The contents will now be nicely animated when navigating.
Hope this helps, Stephanvs
I'm trying to use ObservableLists to help me orchestrate an MVC framework in a new application I'm building. I have a LineData object that contains the information necessary to draw a line on screen, and I want to maintain a list of LineData in the backend of my program. Then, I want corresponding lines to be drawn on screen via the front end whenever the list of LineData is drawn in the backend. I believe that to do this, I need to have a list in the front end that is bound to the list in the backend, and then I need to have some sort of listener on this list that triggers new data to be turned into lines and drawn? I'm just confused on how to do this -- any help would be greatly appreciated! Thanks!
You can do this "by hand", registering a listener with the ObservableList<LineData> and adding or removing elements from the child list of a Pane as needed. So something like
public class Model {
// ...
public ObservableList<LineData> getLineData() { ... }
// ...
}
And then
public class MyController {
Model model ;
#FXML
private Pane pane ; // contains lines...
public void initialize() {
model.getLineData().addListener((ListChangeListener.Change change) -> {
while (change.next()) {
if (change.wasAdded()) {
change.getAddedSubList().stream()
.map(this::createLineForLineData)
.forEach(pane.getChildren()::add);
} else if (change.wasRemoved()) {
change.getRemoved().forEach(lineData ->
pane.getChildren().removeIf((Line line) -> lineMatchesLineData(line, lineData));
}
}
});
// ...
}
// ...
private Line createLineForLineData(LineData lineData) {
// create Line matching data in lineData and return it
}
private boolean lineMatchesLineData(Line line, LineData lineData) {
// return true if line's state matches data in lineData, false otherwise
}
}
Note though that the EasyBind framework has built-in functionality for this:
public class MyController {
Model model ;
#FXML
private Pane pane ;
public void initialize() {
Bindings.bindContent(pane.getChildren(),
EasyBind.map(model.getLineData(), this::createLineForLineData));
// ...
}
private Line createLineForLineData(LineData lineData) { ... }
}