ImageZoom

A library that makes any view to be zoomable. It was created to mimick the Instagram Zoom feature.

Dependency

1. For using ImageZoom module in sample app, include the source code and add the below dependencies in entry/build.gradle to generate hap/support.har.

	dependencies {
		implementation project(':imagezoom')
        	implementation fileTree(dir: 'libs', include: ['*.har'])
        	testCompile 'junit:junit:4.12'
	}

2. For using ImageZoom in separate application using har file, add the har file in the entry/libs folder and add the dependencies in entry/build.gradle file.

	dependencies {
		implementation fileTree(dir: 'libs', include: ['*.har'])
		testCompile 'junit:junit:4.12'
	}

3. For using ImageZoom from a remote repository in separate application, add the below dependencies in entry/build.gradle file.

	dependencies {
		implementation 'dev.applibgroup:imagezoom:1.0.0'
		testCompile 'junit:junit:4.12'
	}

Source

Inspired from the android library ImageZoom

Features

• Double Tap to zoom or Pinch to zoom.
• Component can be dragged using one or two fingers.
• Double Tap the zoomed component to restore original component.
• Zooming animations is also possible.

Usage

Create an ImageZoomHelper instance in the OnCreate function of your AbilitySlice

ImageZoomHelper imageZoomHelper;

@Override
public void onStart(Intent intent) {
	// ... your code ...
	imageZoomHelper = new ImageZoomHelper(this.getAbility());
}

Override onTouchEvent of the component to be zoomed and pass all of its touch events to the ImageZoomHelper instance, thereby enabling zoom:

img.setTouchEventListener(new Component.TouchEventListener() {
	@Override
	public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
		// Request Focus here so that the latest component being touched is having the focus
                img.requestFocus();
		return imageZoomHelper.onDispatchTouchEvent((touchEvent)) || onTouchEvent(component, touchEvent);
	}
});

To enable/disable zoom for certain Views (e.g. Recycler View refreshing)

NOTE: Tags have not been implemented. But you can do any of the following according to usecase.

// 1. Override setTouchEventListener according to your requirement if you want to disable zoom.
img.setTouchEventListener(new Component.TouchEventListener() {
	@Override
	public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
		// your code...
		return onTouchEvent(component, touchEvent);
	}
});

// 2. Removing that particular component out of focus.
img.setTouchFocusable(false);

Advanced Usage

For a smoother zoom transition, set the layout to be fullscreen.

ListContainer

Override the getComponent method in SampleItemProvider class.

@Override
public Component getComponent(int position, Component convertComponent, ComponentContainer componentContainer) {
	final Component cpt;
	if (convertComponent == null) {
		cpt = LayoutScatter.getInstance(slice).parse(ResourceTable.Layout_item_sample, null, false);
	} else {
		cpt = convertComponent;
	}
	
	Component comp = cpt.findComponentById(ResourceTable.Id_comp);
	// Code for any kind of animation (if required).

	comp.setTouchEventListener(new Component.TouchEventListener() {
		@Override
		public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
			comp.requestFocus();
			return imageZoomHelper.onDispatchTouchEvent((touchEvent)) || onTouchEvent(component, touchEvent);
		}
	});

	return cpt;
}