@Override
public void setViewPager(ViewPager view, int initialPosition) {
setViewPager(view);
setCurrentItem(initialPosition);
}
/*
* (non-Javadoc)
*
* @see android.view.View#onDraw(android.graphics.Canvas)
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mViewPager == null) return;
final int count = mViewPager.getAdapter().getCount();
if (count == 0) return;
// mCurrentPage is -1 on first start and after orientation changed. If so, retrieve the correct
// index from viewpager.
if (mCurrentPage == -1 && mViewPager != null) {
mCurrentPage = mViewPager.getCurrentItem();
}
// Calculate views bounds
ArrayList<Rect> bounds = calculateAllBounds(mPaintText);
final int boundsSize = bounds.size();
// Make sure we're on a page that still exists
if (mCurrentPage >= boundsSize) {
setCurrentItem(boundsSize - 1);
return;
}
final int countMinusOne = count - 1;
final float halfWidth = getWidth() / 2f;
final int left = getLeft();
final float leftClip = left + mClipPadding;
final int width = getWidth();
int height = getHeight();
final int right = left + width;
final float rightClip = right - mClipPadding;
int page = mCurrentPage;
float offsetPercent;
if (mPageOffset <= 0.5) {
offsetPercent = mPageOffset;
} else {
page += 1;
offsetPercent = 1 - mPageOffset;
}
final boolean currentSelected = (offsetPercent <= SELECTION_FADE_PERCENTAGE);
final boolean currentBold = (offsetPercent <= BOLD_FADE_PERCENTAGE);
final float selectedPercent =
(SELECTION_FADE_PERCENTAGE - offsetPercent) / SELECTION_FADE_PERCENTAGE;
// Verify if the current view must be clipped to the screen
Rect curPageBound = bounds.get(mCurrentPage);
float curPageWidth = curPageBound.right - curPageBound.left;
if (curPageBound.left < leftClip) {
// Try to clip to the screen (left side)
clipViewOnTheLeft(curPageBound, curPageWidth, left);
}
if (curPageBound.right > rightClip) {
// Try to clip to the screen (right side)
clipViewOnTheRight(curPageBound, curPageWidth, right);
}
// Left views starting from the current position
if (mCurrentPage > 0) {
for (int i = mCurrentPage - 1; i >= 0; i--) {
Rect bound = bounds.get(i);
// Is left side is outside the screen
if (bound.left < leftClip) {
int w = bound.right - bound.left;
// Try to clip to the screen (left side)
clipViewOnTheLeft(bound, w, left);
// Except if there's an intersection with the right view
Rect rightBound = bounds.get(i + 1);
// Intersection
if (bound.right + mTitlePadding > rightBound.left) {
bound.left = (int) (rightBound.left - w - mTitlePadding);
bound.right = bound.left + w;
}
}
}
}
// Right views starting from the current position
if (mCurrentPage < countMinusOne) {
for (int i = mCurrentPage + 1; i < count; i++) {
Rect bound = bounds.get(i);
// If right side is outside the screen
if (bound.right > rightClip) {
int w = bound.right - bound.left;
// Try to clip to the screen (right side)
clipViewOnTheRight(bound, w, right);
// Except if there's an intersection with the left view
Rect leftBound = bounds.get(i - 1);
// Intersection
if (bound.left - mTitlePadding < leftBound.right) {
bound.left = (int) (leftBound.right + mTitlePadding);
bound.right = bound.left + w;
}
}
}
}
// Now draw views
int colorTextAlpha = mColorText >>> 24;
for (int i = 0; i < count; i++) {
// Get the title
Rect bound = bounds.get(i);
// Only if one side is visible
if ((bound.left > left && bound.left < right)
|| (bound.right > left && bound.right < right)) {
final boolean currentPage = (i == page);
final CharSequence pageTitle = getTitle(i);
// Only set bold if we are within bounds
mPaintText.setFakeBoldText(currentPage && currentBold && mBoldText);
// Draw text as unselected
mPaintText.setColor(mColorText);
if (currentPage && currentSelected) {
// Fade out/in unselected text as the selected text fades in/out
mPaintText.setAlpha(colorTextAlpha - (int) (colorTextAlpha * selectedPercent));
}
// Except if there's an intersection with the right view
if (i < boundsSize - 1) {
Rect rightBound = bounds.get(i + 1);
// Intersection
if (bound.right + mTitlePadding > rightBound.left) {
int w = bound.right - bound.left;
bound.left = (int) (rightBound.left - w - mTitlePadding);
bound.right = bound.left + w;
}
}
canvas.drawText(
pageTitle, 0, pageTitle.length(), bound.left, bound.bottom + mTopPadding, mPaintText);
// If we are within the selected bounds draw the selected text
if (currentPage && currentSelected) {
mPaintText.setColor(mColorSelected);
mPaintText.setAlpha((int) ((mColorSelected >>> 24) * selectedPercent));
canvas.drawText(
pageTitle, 0, pageTitle.length(), bound.left, bound.bottom + mTopPadding, mPaintText);
}
}
}
// If we want the line on the top change height to zero and invert the line height to trick the
// drawing code
float footerLineHeight = mFooterLineHeight;
float footerIndicatorLineHeight = mFooterIndicatorHeight;
if (mLinePosition == LinePosition.Top) {
height = 0;
footerLineHeight = -footerLineHeight;
footerIndicatorLineHeight = -footerIndicatorLineHeight;
}
// Draw the footer line
mPath.reset();
mPath.moveTo(0, height - footerLineHeight / 2f);
mPath.lineTo(width, height - footerLineHeight / 2f);
mPath.close();
canvas.drawPath(mPath, mPaintFooterLine);
float heightMinusLine = height - footerLineHeight;
switch (mFooterIndicatorStyle) {
case Triangle:
mPath.reset();
mPath.moveTo(halfWidth, heightMinusLine - footerIndicatorLineHeight);
mPath.lineTo(halfWidth + footerIndicatorLineHeight, heightMinusLine);
mPath.lineTo(halfWidth - footerIndicatorLineHeight, heightMinusLine);
mPath.close();
canvas.drawPath(mPath, mPaintFooterIndicator);
break;
case Underline:
if (!currentSelected || page >= boundsSize) {
break;
}
Rect underlineBounds = bounds.get(page);
final float rightPlusPadding = underlineBounds.right + mFooterIndicatorUnderlinePadding;
final float leftMinusPadding = underlineBounds.left - mFooterIndicatorUnderlinePadding;
final float heightMinusLineMinusIndicator = heightMinusLine - footerIndicatorLineHeight;
mPath.reset();
mPath.moveTo(leftMinusPadding, heightMinusLine);
mPath.lineTo(rightPlusPadding, heightMinusLine);
mPath.lineTo(rightPlusPadding, heightMinusLineMinusIndicator);
mPath.lineTo(leftMinusPadding, heightMinusLineMinusIndicator);
mPath.close();
mPaintFooterIndicator.setAlpha((int) (0xFF * selectedPercent));
canvas.drawPath(mPath, mPaintFooterIndicator);
mPaintFooterIndicator.setAlpha(0xFF);
break;
case None:
default:
break;
}
}