/**
* Swap Tab effect(color or cross fade)
*
* @param position The page position
* @param positionOffset The page position offset
*/
private void swapTabColor(int position, float positionOffset, boolean left) {
final int colorDefault = mTabColorize.getDefaultTabColor(position);
final int colorSelected = mTabColorize.getSelectedTabColor(position);
final int nextColorDefault = mTabColorize.getDefaultTabColor(position + 1);
final int nextColorSelected = mTabColorize.getSelectedTabColor(position + 1);
int color = colorDefault;
int nextColor = nextColorSelected;
if (mTabColorBlendMode == TabColorBlendMode.DEFAULT_SELECTED) {
if (colorDefault != colorSelected) {
color = ColorUtils.blendColors(colorDefault, colorSelected, positionOffset);
}
if (nextColorDefault != nextColorSelected) {
nextColor = ColorUtils.blendColors(nextColorSelected, nextColorDefault, positionOffset);
}
} else if (mTabColorBlendMode == TabColorBlendMode.NEXT_SELECTED) {
if (!left) {
if (colorDefault != colorSelected) {
color = ColorUtils.blendColors(colorDefault, colorSelected, positionOffset);
}
if (nextColorSelected != colorSelected) {
nextColor = ColorUtils.blendColors(nextColorSelected, colorSelected, positionOffset);
}
} else {
if (colorSelected != nextColorSelected) {
color = ColorUtils.blendColors(colorSelected, nextColorSelected, 1 - positionOffset);
}
if (nextColorDefault != nextColorSelected) {
nextColor =
ColorUtils.blendColors(nextColorDefault, nextColorSelected, 1 - positionOffset);
}
}
}
setTabColor(getNeededView(position), color);
setTabColor(getNeededView(position + 1), nextColor);
}
/**
* Draw indicator
*
* @param canvas The canvas
*/
private void drawIndicator(Canvas canvas) {
if (mShowIndicator) {
final int height = getHeight();
final int childCount = getChildCount();
if (childCount > 0) {
View tabView = getChildAt(mSelectedPosition);
int left = tabView.getLeft();
int right = tabView.getRight();
int color = mTabStripColorize.getIndicatorColor(mSelectedPosition);
if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
int nextColor = mTabStripColorize.getIndicatorColor(mSelectedPosition + 1);
if (color != nextColor) {
color = ColorUtils.blendColors(nextColor, color, mSelectionOffset);
}
// Draw the selection partway between the tabs
View nextTabView = getChildAt(mSelectedPosition + 1);
left =
(int) (mSelectionOffset * nextTabView.getLeft() + (1.0f - mSelectionOffset) * left);
right =
(int) (mSelectionOffset * nextTabView.getRight() + (1.0f - mSelectionOffset) * right);
}
mIndicatorPaint.setColor(color);
RectF rectF =
new RectF(
left,
height - mIndicatorHeight - mIndicatorPaddingBottom,
right,
height - mIndicatorPaddingBottom);
switch (mIndicatorGravity) {
case TOP:
{
rectF.set(left, mIndicatorPaddingTop, right, mIndicatorHeight + mIndicatorPaddingTop);
break;
}
case CENTER:
{
rectF.set(
left, (height - mIndicatorHeight) / 2, right, (height + mIndicatorHeight) / 2);
break;
}
}
if (mIndicatorCornerRadius > 0f) {
mIndicatorPaint.setAntiAlias(true);
canvas.drawRoundRect(
rectF, mIndicatorCornerRadius, mIndicatorCornerRadius, mIndicatorPaint);
} else {
mIndicatorPaint.setAntiAlias(false);
canvas.drawRect(rectF, mIndicatorPaint);
}
if (mOnIndicatorColorChangedListener != null) {
mOnIndicatorColorChangedListener.onIndicatorColorChanged(
(NiceTabLayout) this.getParent(), color);
}
}
}
}