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| /**
* Based on: https://gist.github.com/devunwired/8cbe094bb7a783e37ad1
*/
package trucmuche;
import les_imports_qui_vont_bien;
public class SupportGallery extends FrameLayout implements OnPageChangeListener, ViewPager.OnTouchListener {
private ViewPager mPager;
boolean mNeedsRedraw = false;
public SupportGallery(Context context) {
super(context);
init();
}
public SupportGallery(Context context, AttributeSet attrs) {
super(context, attrs);
init();
parseAttrs(context, attrs);
}
public SupportGallery(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
parseAttrs(context, attrs);
}
private void init() {
mPager = new ViewPager(getContext());
LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT, Gravity.CENTER);
mPager.setLayoutParams(layoutParams);
mPager.setBackgroundResource(R.drawable.drawable_gallery_selected_page);
addView(mPager);
// Disable clipping of children so non-selected pages are visible
setClipChildren(false);
disableHardwareAcceleration();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void disableHardwareAcceleration() {
// Child clipping doesn't work with hardware acceleration in Android
// 3.x/4.x
// You need to set this value here if using hardware acceleration in an
// application targeted at these releases.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
}
private void parseAttrs(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SupportGallery);
float width = typedArray.getDimension(R.styleable.SupportGallery_widthElement, -1);
if (width != -1) {
mPager.getLayoutParams().width = (int) width;
}
float height = typedArray.getDimension(R.styleable.SupportGallery_heightElement, -1);
if (height != -1) {
mPager.getLayoutParams().height = (int) height;
}
typedArray.recycle();
}
@Override
protected void onFinishInflate() {
try {
mPager.setOnPageChangeListener(this);
mPager.setOnTouchListener(this);
} catch (Exception e) {
throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
}
}
public ViewPager getViewPager() {
return mPager;
}
private Point mCenter = new Point();
private Point mInitialTouch = new Point();
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCenter.x = w / 2;
mCenter.y = h / 2;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// We capture any touches not already handled by the ViewPager
// to implement scrolling from a touch outside the pager bounds.
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mInitialTouch.x = (int) ev.getX();
mInitialTouch.y = (int) ev.getY();
case MotionEvent.ACTION_UP :
mInitialTouch.x = (int) ev.getX();
mInitialTouch.y = (int) ev.getY();
default:
ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
break;
}
return mPager.dispatchTouchEvent(ev);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// Force the container to redraw on scrolling.
// Without this the outer pages render initially and then stay static
if (mNeedsRedraw)
invalidate();
}
@Override
public void onPageSelected(int position) {
invalidate();
}
@Override
public void onPageScrollStateChanged(int state) {
mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
}
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
invalidate();
return super.onTouchEvent(arg1);
}
} |
SupportGallery & problème de scroll
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