/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private RectF calcBounds(int index, Paint paint) {
// Calculate the text bounds
RectF bounds = new RectF();
bounds.right = paint.measureText(mTitleProvider.getTitle(index));
bounds.bottom = paint.descent() - paint.ascent();
return bounds;
}
@Override
public void onPageSelected(int position) {
setCurrentItem(position);
mAdapter.onPageSelected(position);
if (mListener != null) {
mListener.onPageSelected(position);
}
}
/**
* Returns the title
*
* @param pos
* @return
*/
private String getTitle(int pos) {
// Set the default title
String title = "title " + pos;
// If the TitleProvider exist
if (titleProvider != null) {
title = titleProvider.getTitle(pos);
}
return title;
}
@Override
public void onClick(View view) {
if (!mPagingEnabled) return;
final TabView tabView = (TabView) view;
if (mCurrentItem == tabView.getIndex()) {
mAdapter.onPageReselected(mCurrentItem);
}
mCurrentItem = tabView.getIndex();
mViewPager.setCurrentItem(mCurrentItem);
}
public void notifyDataSetChanged() {
if (mTabLayout == null || mViewPager == null) return;
mTabLayout.removeAllViews();
mAdapter = (TitleProvider) mViewPager.getAdapter();
if (mAdapter == null) return;
final int count = ((PagerAdapter) mAdapter).getCount();
for (int i = 0; i < count; i++) {
final String title = mAdapter.getTitle(i);
final Drawable icon = mAdapter.getIcon(i);
if (title != null && icon != null) {
addTab(title, icon, i);
} else if (title == null && icon != null) {
addTab(icon, i);
} else if (title != null && icon == null) {
addTab(title, i);
}
}
if (mSelectedTabIndex > count) {
mSelectedTabIndex = count - 1;
}
setCurrentItem(mSelectedTabIndex);
requestLayout();
}
/*
* (non-Javadoc)
*
* @see android.view.View#onDraw(android.graphics.Canvas)
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Calculate views bounds
ArrayList<RectF> bounds = calculateAllBounds(mPaintText);
final int count = mViewPager.getAdapter().getCount();
final int countMinusOne = count - 1;
final float halfWidth = getWidth() / 2f;
final int left = getLeft();
final float leftClip = left + mClipPadding;
final int width = getWidth();
final int height = getHeight();
final int right = left + width;
final float rightClip = right - mClipPadding;
int page = mCurrentPage;
float offsetPercent;
if (mCurrentOffset <= halfWidth) {
offsetPercent = 1.0f * mCurrentOffset / width;
} else {
page += 1;
offsetPercent = 1.0f * (width - mCurrentOffset) / width;
}
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
RectF 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--) {
RectF bound = bounds.get(i);
// Is left side is outside the screen
if (bound.left < leftClip) {
float 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
RectF rightBound = bounds.get(i + 1);
// Intersection
if (bound.right + mTitlePadding > rightBound.left) {
bound.left = 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++) {
RectF bound = bounds.get(i);
// If right side is outside the screen
if (bound.right > rightClip) {
float 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
RectF leftBound = bounds.get(i - 1);
// Intersection
if (bound.left - mTitlePadding < leftBound.right) {
bound.left = leftBound.right + mTitlePadding;
bound.right = bound.left + w;
}
}
}
}
// Now draw views
for (int i = 0; i < count; i++) {
// Get the title
RectF 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);
// Only set bold if we are within bounds
mPaintText.setFakeBoldText(currentPage && currentBold && mBoldText);
// Draw text as unselected
mPaintText.setColor(mColorText);
canvas.drawText(
mTitleProvider.getTitle(i), 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(
mTitleProvider.getTitle(i), bound.left, bound.bottom + mTopPadding, mPaintText);
}
}
}
// Draw the footer line
mPath = new Path();
mPath.moveTo(0, height - mFooterLineHeight / 2f);
mPath.lineTo(width, height - mFooterLineHeight / 2f);
mPath.close();
canvas.drawPath(mPath, mPaintFooterLine);
switch (mFooterIndicatorStyle) {
case Triangle:
mPath = new Path();
mPath.moveTo(halfWidth, height - mFooterLineHeight - mFooterIndicatorHeight);
mPath.lineTo(halfWidth + mFooterIndicatorHeight, height - mFooterLineHeight);
mPath.lineTo(halfWidth - mFooterIndicatorHeight, height - mFooterLineHeight);
mPath.close();
canvas.drawPath(mPath, mPaintFooterIndicator);
break;
case Underline:
if (!currentSelected) {
break;
}
RectF underlineBounds = bounds.get(page);
mPath = new Path();
mPath.moveTo(
underlineBounds.left - mFooterIndicatorUnderlinePadding, height - mFooterLineHeight);
mPath.lineTo(
underlineBounds.right + mFooterIndicatorUnderlinePadding, height - mFooterLineHeight);
mPath.lineTo(
underlineBounds.right + mFooterIndicatorUnderlinePadding,
height - mFooterLineHeight - mFooterIndicatorHeight);
mPath.lineTo(
underlineBounds.left - mFooterIndicatorUnderlinePadding,
height - mFooterLineHeight - mFooterIndicatorHeight);
mPath.close();
mPaintFooterIndicator.setAlpha((int) (0xFF * selectedPercent));
canvas.drawPath(mPath, mPaintFooterIndicator);
mPaintFooterIndicator.setAlpha(0xFF);
break;
}
}