Examples with Scroller android.widget.Scroller used on opensource projects

Example 36 with Scroller

use of android.widget.Scroller in project android_frameworks_base by crdroidandroid.

the class ViewRootImpl method scrollToRectOrFocus.

boolean scrollToRectOrFocus(Rect rectangle, boolean immediate) {
    final Rect ci = mAttachInfo.mContentInsets;
    final Rect vi = mAttachInfo.mVisibleInsets;
    int scrollY = 0;
    boolean handled = false;
    if (vi.left > ci.left || vi.top > ci.top || vi.right > ci.right || vi.bottom > ci.bottom) {
        // We'll assume that we aren't going to change the scroll
        // offset, since we want to avoid that unless it is actually
        // going to make the focus visible...  otherwise we scroll
        // all over the place.
        scrollY = mScrollY;
        // We can be called for two different situations: during a draw,
        // to update the scroll position if the focus has changed (in which
        // case 'rectangle' is null), or in response to a
        // requestChildRectangleOnScreen() call (in which case 'rectangle'
        // is non-null and we just want to scroll to whatever that
        // rectangle is).
        final View focus = mView.findFocus();
        if (focus == null) {
            return false;
        }
        View lastScrolledFocus = (mLastScrolledFocus != null) ? mLastScrolledFocus.get() : null;
        if (focus != lastScrolledFocus) {
            // If the focus has changed, then ignore any requests to scroll
            // to a rectangle; first we want to make sure the entire focus
            // view is visible.
            rectangle = null;
        }
        if (DEBUG_INPUT_RESIZE)
            Log.v(mTag, "Eval scroll: focus=" + focus + " rectangle=" + rectangle + " ci=" + ci + " vi=" + vi);
        if (focus == lastScrolledFocus && !mScrollMayChange && rectangle == null) {
            // as they are.
            if (DEBUG_INPUT_RESIZE)
                Log.v(mTag, "Keeping scroll y=" + mScrollY + " vi=" + vi.toShortString());
        } else {
            // We need to determine if the currently focused view is
            // within the visible part of the window and, if not, apply
            // a pan so it can be seen.
            mLastScrolledFocus = new WeakReference<View>(focus);
            mScrollMayChange = false;
            if (DEBUG_INPUT_RESIZE)
                Log.v(mTag, "Need to scroll?");
            // Try to find the rectangle from the focus view.
            if (focus.getGlobalVisibleRect(mVisRect, null)) {
                if (DEBUG_INPUT_RESIZE)
                    Log.v(mTag, "Root w=" + mView.getWidth() + " h=" + mView.getHeight() + " ci=" + ci.toShortString() + " vi=" + vi.toShortString());
                if (rectangle == null) {
                    focus.getFocusedRect(mTempRect);
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus " + focus + ": focusRect=" + mTempRect.toShortString());
                    if (mView instanceof ViewGroup) {
                        ((ViewGroup) mView).offsetDescendantRectToMyCoords(focus, mTempRect);
                    }
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus in window: focusRect=" + mTempRect.toShortString() + " visRect=" + mVisRect.toShortString());
                } else {
                    mTempRect.set(rectangle);
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Request scroll to rect: " + mTempRect.toShortString() + " visRect=" + mVisRect.toShortString());
                }
                if (mTempRect.intersect(mVisRect)) {
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus window visible rect: " + mTempRect.toShortString());
                    if (mTempRect.height() > (mView.getHeight() - vi.top - vi.bottom)) {
                        // best is probably just to leave things as-is.
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Too tall; leaving scrollY=" + scrollY);
                    } else // and bottom both visible, but we still need to scroll it back to 0.
                    if (mTempRect.top < vi.top) {
                        scrollY = mTempRect.top - vi.top;
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Top covered; scrollY=" + scrollY);
                    } else if (mTempRect.bottom > (mView.getHeight() - vi.bottom)) {
                        scrollY = mTempRect.bottom - (mView.getHeight() - vi.bottom);
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Bottom covered; scrollY=" + scrollY);
                    } else {
                        scrollY = 0;
                    }
                    handled = true;
                }
            }
        }
    }
    if (scrollY != mScrollY) {
        if (DEBUG_INPUT_RESIZE)
            Log.v(mTag, "Pan scroll changed: old=" + mScrollY + " , new=" + scrollY);
        if (!immediate) {
            if (mScroller == null) {
                mScroller = new Scroller(mView.getContext());
            }
            mScroller.startScroll(0, mScrollY, 0, scrollY - mScrollY);
        } else if (mScroller != null) {
            mScroller.abortAnimation();
        }
        mScrollY = scrollY;
    }
    return handled;
}

Example 37 with Scroller

use of android.widget.Scroller in project smartmodule by carozhu.

the class LazyViewpager method initViewPager.

void initViewPager() {
    setWillNotDraw(false);
    setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
    setFocusable(true);
    final Context context = getContext();
    mScroller = new Scroller(context, sInterpolator);
    final ViewConfiguration configuration = ViewConfiguration.get(context);
    mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
    mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
    mLeftEdge = new EdgeEffectCompat(context);
    mRightEdge = new EdgeEffectCompat(context);
    float density = context.getResources().getDisplayMetrics().density;
    mBaseLineFlingVelocity = 2500.0f * density;
    mFlingVelocityInfluence = 0.4f;
}

Example 38 with Scroller

use of android.widget.Scroller in project smartmodule by carozhu.

the class SmartViewPager method initViewPager.

void initViewPager() {
    setWillNotDraw(false);
    setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
    setFocusable(true);
    final Context context = getContext();
    mScroller = new Scroller(context, sInterpolator);
    final ViewConfiguration configuration = ViewConfiguration.get(context);
    final float density = context.getResources().getDisplayMetrics().density;
    mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
    mMinimumVelocity = (int) (MIN_FLING_VELOCITY * density);
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
    mLeftEdge = new EdgeEffectCompat(context);
    mRightEdge = new EdgeEffectCompat(context);
    mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
    mCloseEnough = (int) (CLOSE_ENOUGH * density);
    mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);
    ViewCompat.setAccessibilityDelegate(this, new MyAccessibilityDelegate());
    if (ViewCompat.getImportantForAccessibility(this) == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
        ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
    }
}

Example 39 with Scroller

use of android.widget.Scroller in project android_frameworks_base by AOSPA.

the class ViewRootImpl method scrollToRectOrFocus.

boolean scrollToRectOrFocus(Rect rectangle, boolean immediate) {
    final Rect ci = mAttachInfo.mContentInsets;
    final Rect vi = mAttachInfo.mVisibleInsets;
    int scrollY = 0;
    boolean handled = false;
    if (vi.left > ci.left || vi.top > ci.top || vi.right > ci.right || vi.bottom > ci.bottom) {
        // We'll assume that we aren't going to change the scroll
        // offset, since we want to avoid that unless it is actually
        // going to make the focus visible...  otherwise we scroll
        // all over the place.
        scrollY = mScrollY;
        // We can be called for two different situations: during a draw,
        // to update the scroll position if the focus has changed (in which
        // case 'rectangle' is null), or in response to a
        // requestChildRectangleOnScreen() call (in which case 'rectangle'
        // is non-null and we just want to scroll to whatever that
        // rectangle is).
        final View focus = mView.findFocus();
        if (focus == null) {
            return false;
        }
        View lastScrolledFocus = (mLastScrolledFocus != null) ? mLastScrolledFocus.get() : null;
        if (focus != lastScrolledFocus) {
            // If the focus has changed, then ignore any requests to scroll
            // to a rectangle; first we want to make sure the entire focus
            // view is visible.
            rectangle = null;
        }
        if (DEBUG_INPUT_RESIZE)
            Log.v(mTag, "Eval scroll: focus=" + focus + " rectangle=" + rectangle + " ci=" + ci + " vi=" + vi);
        if (focus == lastScrolledFocus && !mScrollMayChange && rectangle == null) {
            // as they are.
            if (DEBUG_INPUT_RESIZE)
                Log.v(mTag, "Keeping scroll y=" + mScrollY + " vi=" + vi.toShortString());
        } else {
            // We need to determine if the currently focused view is
            // within the visible part of the window and, if not, apply
            // a pan so it can be seen.
            mLastScrolledFocus = new WeakReference<View>(focus);
            mScrollMayChange = false;
            if (DEBUG_INPUT_RESIZE)
                Log.v(mTag, "Need to scroll?");
            // Try to find the rectangle from the focus view.
            if (focus.getGlobalVisibleRect(mVisRect, null)) {
                if (DEBUG_INPUT_RESIZE)
                    Log.v(mTag, "Root w=" + mView.getWidth() + " h=" + mView.getHeight() + " ci=" + ci.toShortString() + " vi=" + vi.toShortString());
                if (rectangle == null) {
                    focus.getFocusedRect(mTempRect);
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus " + focus + ": focusRect=" + mTempRect.toShortString());
                    if (mView instanceof ViewGroup) {
                        ((ViewGroup) mView).offsetDescendantRectToMyCoords(focus, mTempRect);
                    }
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus in window: focusRect=" + mTempRect.toShortString() + " visRect=" + mVisRect.toShortString());
                } else {
                    mTempRect.set(rectangle);
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Request scroll to rect: " + mTempRect.toShortString() + " visRect=" + mVisRect.toShortString());
                }
                if (mTempRect.intersect(mVisRect)) {
                    if (DEBUG_INPUT_RESIZE)
                        Log.v(mTag, "Focus window visible rect: " + mTempRect.toShortString());
                    if (mTempRect.height() > (mView.getHeight() - vi.top - vi.bottom)) {
                        // best is probably just to leave things as-is.
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Too tall; leaving scrollY=" + scrollY);
                    } else // and bottom both visible, but we still need to scroll it back to 0.
                    if (mTempRect.top < vi.top) {
                        scrollY = mTempRect.top - vi.top;
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Top covered; scrollY=" + scrollY);
                    } else if (mTempRect.bottom > (mView.getHeight() - vi.bottom)) {
                        scrollY = mTempRect.bottom - (mView.getHeight() - vi.bottom);
                        if (DEBUG_INPUT_RESIZE)
                            Log.v(mTag, "Bottom covered; scrollY=" + scrollY);
                    } else {
                        scrollY = 0;
                    }
                    handled = true;
                }
            }
        }
    }
    if (scrollY != mScrollY) {
        if (DEBUG_INPUT_RESIZE)
            Log.v(mTag, "Pan scroll changed: old=" + mScrollY + " , new=" + scrollY);
        if (!immediate) {
            if (mScroller == null) {
                mScroller = new Scroller(mView.getContext());
            }
            mScroller.startScroll(0, mScrollY, 0, scrollY - mScrollY);
        } else if (mScroller != null) {
            mScroller.abortAnimation();
        }
        mScrollY = scrollY;
    }
    return handled;
}

Example 40 with Scroller

use of android.widget.Scroller in project ChatExchange by HueToYou.

the class CustomViewAbove method initCustomViewAbove.

void initCustomViewAbove() {
    setWillNotDraw(false);
    setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
    setFocusable(true);
    final Context context = getContext();
    mScroller = new Scroller(context, sInterpolator);
    final ViewConfiguration configuration = ViewConfiguration.get(context);
    mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
    mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
    mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
    setInternalPageChangeListener(new SimpleOnPageChangeListener() {

        public void onPageSelected(int position) {
            if (mViewBehind != null) {
                switch(position) {
                    case 0:
                    case 2:
                        mViewBehind.setChildrenEnabled(true);
                        break;
                    case 1:
                        mViewBehind.setChildrenEnabled(false);
                        break;
                }
            }
        }
    });
    final float density = context.getResources().getDisplayMetrics().density;
    mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
}