/**
* Places a single view on the current row, and updates the view's layout parameters to remember
* its position. mStart, mEnd, and mBottom are updated to reflect the space taken by the view.
*/
private void placeChild(View child, int gravity) {
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int availableWidth = Math.max(0, mEnd - mStart - lp.startMargin - lp.endMargin);
if (child.getMeasuredWidth() > availableWidth || gravity == Gravity.FILL_HORIZONTAL) {
measureChildWithFixedWidth(child, availableWidth);
}
if (gravity == Gravity.START || gravity == Gravity.FILL_HORIZONTAL) {
lp.start = mStart + lp.startMargin;
mStart = lp.start + child.getMeasuredWidth() + lp.endMargin;
} else { // gravity == Gravity.END
lp.start = mEnd - lp.endMargin - child.getMeasuredWidth();
mEnd = lp.start - lp.startMargin;
}
lp.top = mTop + lp.topMargin;
mBottom = Math.max(mBottom, lp.top + child.getMeasuredHeight() + lp.bottomMargin);
}
/**
* Assigns positions to all of the views in the infobar. The icon, text, and close button are
* placed on the main row. The custom content and finally the buttons are placed on the main row
* if they fit. Otherwise, they go on their own rows.
*/
private void placeGroups() {
startRow();
placeChild(mCloseButton, Gravity.END);
placeGroup(mMainGroup);
int customGroupWidth = 0;
if (mCustomGroup != null) {
updateCustomGroupForRow(ROW_MAIN);
customGroupWidth = getWidthWithMargins(mCustomGroup);
}
int buttonGroupWidth = 0;
if (mButtonGroup != null) {
updateButtonGroupForRow(ROW_MAIN);
buttonGroupWidth = getWidthWithMargins(mButtonGroup);
}
boolean customGroupOnMainRow = customGroupWidth <= availableWidth();
boolean buttonGroupOnMainRow = customGroupWidth + buttonGroupWidth <= availableWidth();
if (mCustomGroup != null) {
if (customGroupOnMainRow) {
mCustomGroup.gravity =
(mButtonGroup != null && buttonGroupOnMainRow) ? Gravity.START : Gravity.END;
} else {
startRow();
updateCustomGroupForRow(ROW_OTHER);
}
placeGroup(mCustomGroup);
}
if (mButtonGroup != null) {
if (!buttonGroupOnMainRow) {
startRow();
updateButtonGroupForRow(ROW_OTHER);
// If the infobar consists of just a main row and a buttons row, the buttons must be
// at least 32dp below the bottom of the message text.
if (mCustomGroup == null && mMessageTextView != null) {
LayoutParams lp = (LayoutParams) mMessageTextView.getLayoutParams();
int messageBottom = lp.top + mMessageTextView.getMeasuredHeight();
mTop = Math.max(mTop, messageBottom + 2 * mMargin);
}
}
placeGroup(mButtonGroup);
if (mCustomButton != null && !buttonGroupOnMainRow) {
// The custom button is start-aligned with the message view (unless that causes it
// to overlap the primary button).
LayoutParams primaryButtonLP = (LayoutParams) mPrimaryButton.getLayoutParams();
LayoutParams customButtonLP = (LayoutParams) mCustomButton.getLayoutParams();
LayoutParams messageLP = (LayoutParams) mMessageView.getLayoutParams();
if (customButtonLP.start >= messageLP.start) {
customButtonLP.start = messageLP.start;
} else {
customButtonLP.start = mMargin;
}
if (!mButtonGroup.isStacked) {
// Center the custom button vertically relative to the primary button.
customButtonLP.top =
primaryButtonLP.top
+ (mPrimaryButton.getMeasuredHeight() - mCustomButton.getMeasuredHeight()) / 2;
}
}
}
startRow();
// If everything fits on a single row, center everything vertically.
if (buttonGroupOnMainRow) {
int layoutHeight = mBottom;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
int extraSpace = layoutHeight - child.getMeasuredHeight();
LayoutParams lp = (LayoutParams) child.getLayoutParams();
lp.top = extraSpace / 2;
}
}
}
