Example usage for android.graphics Canvas restoreToCount

Introduction

In this page you can find the example usage for android.graphics Canvas restoreToCount.

Prototype

public void restoreToCount(int saveCount)

Source Link

Document

Efficient way to pop any calls to save() that happened after the save count reached saveCount.

Usage

From source file:cn.ismartv.tvrecyclerview.widget.RecyclerView.java

@Override
public void draw(Canvas c) {
    super.draw(c);

    final int count = mItemDecorations.size();
    for (int i = 0; i < count; i++) {
        mItemDecorations.get(i).onDrawOver(c, this, mState);
    }//from w  w  w.  j  a va2s.  c o  m
    // TODO If padding is not 0 and clipChildrenToPadding is false, to draw glows properly, we
    // need find children closest to edges. Not sure if it is worth the effort.
    boolean needsInvalidate = false;
    if (mLeftGlow != null && !mLeftGlow.isFinished()) {
        final int restore = c.save();
        final int padding = mClipToPadding ? getPaddingBottom() : 0;
        c.rotate(270);
        c.translate(-getHeight() + padding, 0);
        needsInvalidate = mLeftGlow != null && mLeftGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mTopGlow != null && !mTopGlow.isFinished()) {
        final int restore = c.save();
        if (mClipToPadding) {
            c.translate(getPaddingLeft(), getPaddingTop());
        }
        needsInvalidate |= mTopGlow != null && mTopGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mRightGlow != null && !mRightGlow.isFinished()) {
        final int restore = c.save();
        final int width = getWidth();
        final int padding = mClipToPadding ? getPaddingTop() : 0;
        c.rotate(90);
        c.translate(-padding, -width);
        needsInvalidate |= mRightGlow != null && mRightGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mBottomGlow != null && !mBottomGlow.isFinished()) {
        final int restore = c.save();
        c.rotate(180);
        if (mClipToPadding) {
            c.translate(-getWidth() + getPaddingRight(), -getHeight() + getPaddingBottom());
        } else {
            c.translate(-getWidth(), -getHeight());
        }
        needsInvalidate |= mBottomGlow != null && mBottomGlow.draw(c);
        c.restoreToCount(restore);
    }

    // If some views are animating, ItemDecorators are likely to move/change with them.
    // Invalidate RecyclerView to re-draw decorators. This is still efficient because children's
    // display lists are not invalidated.
    if (!needsInvalidate && mItemAnimator != null && mItemDecorations.size() > 0 && mItemAnimator.isRunning()) {
        needsInvalidate = true;
    }

    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
}

From source file:com.ferdi2005.secondgram.support.widget.RecyclerView.java

@Override
public void draw(Canvas c) {
    super.draw(c);

    final int count = mItemDecorations.size();
    for (int i = 0; i < count; i++) {
        mItemDecorations.get(i).onDrawOver(c, this, mState);
    }/*from   www  . ja v  a  2  s.  co  m*/
    // TODO If padding is not 0 and clipChildrenToPadding is false, to draw glows properly, we
    // need find children closest to edges. Not sure if it is worth the effort.
    boolean needsInvalidate = false;
    if (mLeftGlow != null && !mLeftGlow.isFinished()) {
        final int restore = c.save();
        final int padding = mClipToPadding ? getPaddingBottom() : 0;
        c.rotate(270);
        c.translate(-getHeight() + padding, 0);
        needsInvalidate = mLeftGlow != null && mLeftGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mTopGlow != null && !mTopGlow.isFinished()) {
        final int restore = c.save();
        if (mClipToPadding) {
            c.translate(getPaddingLeft(), getPaddingTop());
        }
        c.translate(0, topGlowOffset);
        needsInvalidate |= mTopGlow != null && mTopGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mRightGlow != null && !mRightGlow.isFinished()) {
        final int restore = c.save();
        final int width = getWidth();
        final int padding = mClipToPadding ? getPaddingTop() : 0;
        c.rotate(90);
        c.translate(-padding, -width);
        needsInvalidate |= mRightGlow != null && mRightGlow.draw(c);
        c.restoreToCount(restore);
    }
    if (mBottomGlow != null && !mBottomGlow.isFinished()) {
        final int restore = c.save();
        c.rotate(180);
        if (mClipToPadding) {
            c.translate(-getWidth() + getPaddingRight(), -getHeight() + getPaddingBottom());
        } else {
            c.translate(-getWidth(), -getHeight());
        }
        needsInvalidate |= mBottomGlow != null && mBottomGlow.draw(c);
        c.restoreToCount(restore);
    }

    // If some views are animating, ItemDecorators are likely to move/change with them.
    // Invalidate RecyclerView to re-draw decorators. This is still efficient because children's
    // display lists are not invalidated.
    if (!needsInvalidate && mItemAnimator != null && mItemDecorations.size() > 0 && mItemAnimator.isRunning()) {
        needsInvalidate = true;
    }

    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
}