FadedEdgeDrawHelperpublic class FadedEdgeDrawHelper extends Object
| Fields Summary |
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| public static final boolean | OPTIMIZE_SW_RENDERED_RECENTS | | public static final boolean | USE_DARK_FADE_IN_HW_ACCELERATED_MODE | | private android.view.View | mScrollView | | private int | mFadingEdgeLength | | private boolean | mIsVertical | | private boolean | mSoftwareRendered | | private android.graphics.Paint | mBlackPaint | | private android.graphics.Paint | mFadePaint | | private android.graphics.Matrix | mFadeMatrix | | private android.graphics.LinearGradient | mFade |
| Constructors Summary |
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public FadedEdgeDrawHelper(android.content.Context context, android.util.AttributeSet attrs, android.view.View scrollView, boolean isVertical)
mScrollView = scrollView;
TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View);
mFadingEdgeLength = a.getDimensionPixelSize(android.R.styleable.View_fadingEdgeLength,
ViewConfiguration.get(context).getScaledFadingEdgeLength());
mIsVertical = isVertical;
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| Methods Summary |
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| public void | addViewCallback(android.view.View newLinearLayoutChild)
if (mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS) {
final RecentsPanelView.ViewHolder holder =
(RecentsPanelView.ViewHolder) newLinearLayoutChild.getTag();
holder.labelView.setDrawingCacheEnabled(true);
holder.labelView.buildDrawingCache();
}
| | public static com.android.systemui.recent.FadedEdgeDrawHelper | create(android.content.Context context, android.util.AttributeSet attrs, android.view.View scrollView, boolean isVertical)
boolean isTablet = context.getResources().
getBoolean(R.bool.config_recents_interface_for_tablets);
if (!isTablet && (OPTIMIZE_SW_RENDERED_RECENTS || USE_DARK_FADE_IN_HW_ACCELERATED_MODE)) {
return new FadedEdgeDrawHelper(context, attrs, scrollView, isVertical);
} else {
return null;
}
| | public void | drawCallback(android.graphics.Canvas canvas, int left, int right, int top, int bottom, int scrollX, int scrollY, float topFadingEdgeStrength, float bottomFadingEdgeStrength, float leftFadingEdgeStrength, float rightFadingEdgeStrength, int mPaddingTop)
if ((mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS)
|| USE_DARK_FADE_IN_HW_ACCELERATED_MODE) {
if (mFadePaint == null) {
mFadePaint = new Paint();
mFadeMatrix = new Matrix();
// use use a height of 1, and then wack the matrix each time we
// actually use it.
mFade = new LinearGradient(0, 0, 0, 1, 0xCC000000, 0, Shader.TileMode.CLAMP);
// PULL OUT THIS CONSTANT
mFadePaint.setShader(mFade);
}
// draw the fade effect
boolean drawTop = false;
boolean drawBottom = false;
boolean drawLeft = false;
boolean drawRight = false;
float topFadeStrength = 0.0f;
float bottomFadeStrength = 0.0f;
float leftFadeStrength = 0.0f;
float rightFadeStrength = 0.0f;
final float fadeHeight = mFadingEdgeLength;
int length = (int) fadeHeight;
// clip the fade length if top and bottom fades overlap
// overlapping fades produce odd-looking artifacts
if (mIsVertical && (top + length > bottom - length)) {
length = (bottom - top) / 2;
}
// also clip horizontal fades if necessary
if (!mIsVertical && (left + length > right - length)) {
length = (right - left) / 2;
}
if (mIsVertical) {
topFadeStrength = Math.max(0.0f, Math.min(1.0f, topFadingEdgeStrength));
drawTop = topFadeStrength * fadeHeight > 1.0f;
bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, bottomFadingEdgeStrength));
drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
}
if (!mIsVertical) {
leftFadeStrength = Math.max(0.0f, Math.min(1.0f, leftFadingEdgeStrength));
drawLeft = leftFadeStrength * fadeHeight > 1.0f;
rightFadeStrength = Math.max(0.0f, Math.min(1.0f, rightFadingEdgeStrength));
drawRight = rightFadeStrength * fadeHeight > 1.0f;
}
if (drawTop) {
mFadeMatrix.setScale(1, fadeHeight * topFadeStrength);
mFadeMatrix.postTranslate(left, top);
mFade.setLocalMatrix(mFadeMatrix);
mFadePaint.setShader(mFade);
canvas.drawRect(left, top, right, top + length, mFadePaint);
if (mBlackPaint == null) {
// Draw under the status bar at the top
mBlackPaint = new Paint();
mBlackPaint.setColor(0xFF000000);
}
canvas.drawRect(left, top - mPaddingTop, right, top, mBlackPaint);
}
if (drawBottom) {
mFadeMatrix.setScale(1, fadeHeight * bottomFadeStrength);
mFadeMatrix.postRotate(180);
mFadeMatrix.postTranslate(left, bottom);
mFade.setLocalMatrix(mFadeMatrix);
mFadePaint.setShader(mFade);
canvas.drawRect(left, bottom - length, right, bottom, mFadePaint);
}
if (drawLeft) {
mFadeMatrix.setScale(1, fadeHeight * leftFadeStrength);
mFadeMatrix.postRotate(-90);
mFadeMatrix.postTranslate(left, top);
mFade.setLocalMatrix(mFadeMatrix);
mFadePaint.setShader(mFade);
canvas.drawRect(left, top, left + length, bottom, mFadePaint);
}
if (drawRight) {
mFadeMatrix.setScale(1, fadeHeight * rightFadeStrength);
mFadeMatrix.postRotate(90);
mFadeMatrix.postTranslate(right, top);
mFade.setLocalMatrix(mFadeMatrix);
mFadePaint.setShader(mFade);
canvas.drawRect(right - length, top, right, bottom, mFadePaint);
}
}
| | public int | getHorizontalFadingEdgeLength()
return mFadingEdgeLength;
| | public int | getVerticalFadingEdgeLength()
return mFadingEdgeLength;
| | public void | onAttachedToWindowCallback(android.widget.LinearLayout layout, boolean hardwareAccelerated)
mSoftwareRendered = !hardwareAccelerated;
if ((mSoftwareRendered && OPTIMIZE_SW_RENDERED_RECENTS)
|| USE_DARK_FADE_IN_HW_ACCELERATED_MODE) {
mScrollView.setVerticalFadingEdgeEnabled(false);
mScrollView.setHorizontalFadingEdgeEnabled(false);
}
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