/*
* Copyright 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media.widget;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.AttrRes;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.annotation.StyleRes;
import java.util.ArrayList;
class BaseLayout extends ViewGroup {
private final ArrayList<View> mMatchParentChildren = new ArrayList<>(1);
BaseLayout(@NonNull Context context) {
super(context);
}
BaseLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
BaseLayout(@NonNull Context context, @Nullable AttributeSet attrs,
@AttrRes int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@RequiresApi(21)
BaseLayout(@NonNull Context context, @Nullable AttributeSet attrs,
@AttrRes int defStyleAttr, @StyleRes int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public boolean checkLayoutParams(LayoutParams p) {
return p instanceof MarginLayoutParams;
}
@Override
public LayoutParams generateDefaultLayoutParams() {
return new MarginLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
@Override
public LayoutParams generateLayoutParams(LayoutParams lp) {
if (lp instanceof MarginLayoutParams) {
return lp;
}
return new MarginLayoutParams(lp);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int count = getChildCount();
final boolean measureMatchParentChildren =
MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.EXACTLY
|| MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY;
mMatchParentChildren.clear();
int maxHeight = 0;
int maxWidth = 0;
int childState = 0;
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != View.GONE) {
measureChildWithMargins(
child, widthMeasureSpec, 0, heightMeasureSpec, 0);
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
maxWidth = Math.max(maxWidth,
child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin);
maxHeight = Math.max(maxHeight,
child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin);
childState = childState | child.getMeasuredState();
if (measureMatchParentChildren) {
if (lp.width == LayoutParams.MATCH_PARENT
|| lp.height == LayoutParams.MATCH_PARENT) {
mMatchParentChildren.add(child);
}
}
}
}
// Account for padding too
maxWidth += getPaddingLeftWithForeground() + getPaddingRightWithForeground();
maxHeight += getPaddingTopWithForeground() + getPaddingBottomWithForeground();
// Check against our minimum height and width
maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
if (Build.VERSION.SDK_INT >= 23) {
// Check against our foreground's minimum height and width
final Drawable drawable = getForeground();
if (drawable != null) {
maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
}
}
setMeasuredDimension(
resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
resolveSizeAndState(maxHeight, heightMeasureSpec,
childState << View.MEASURED_HEIGHT_STATE_SHIFT));
count = mMatchParentChildren.size();
if (count > 1) {
for (int i = 0; i < count; i++) {
final View child = mMatchParentChildren.get(i);
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
final int childWidthMeasureSpec;
if (lp.width == LayoutParams.MATCH_PARENT) {
final int width = Math.max(0, getMeasuredWidth()
- getPaddingLeftWithForeground() - getPaddingRightWithForeground()
- lp.leftMargin - lp.rightMargin);
childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
width, MeasureSpec.EXACTLY);
} else {
childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
getPaddingLeftWithForeground() + getPaddingRightWithForeground()
+ lp.leftMargin + lp.rightMargin, lp.width);
}
final int childHeightMeasureSpec;
if (lp.height == LayoutParams.MATCH_PARENT) {
final int height = Math.max(0, getMeasuredHeight()
- getPaddingTopWithForeground() - getPaddingBottomWithForeground()
- lp.topMargin - lp.bottomMargin);
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
height, MeasureSpec.EXACTLY);
} else {
childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec,
getPaddingTopWithForeground() + getPaddingBottomWithForeground()
+ lp.topMargin + lp.bottomMargin, lp.height);
}
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
final int count = getChildCount();
final int parentLeft = getPaddingLeftWithForeground();
final int parentRight = right - left - getPaddingRightWithForeground();
final int parentTop = getPaddingTopWithForeground();
final int parentBottom = bottom - top - getPaddingBottomWithForeground();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != View.GONE) {
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
final int width = child.getMeasuredWidth();
final int height = child.getMeasuredHeight();
int childLeft;
int childTop;
childLeft = parentLeft + (parentRight - parentLeft - width) / 2
+ lp.leftMargin - lp.rightMargin;
childTop = parentTop + (parentBottom - parentTop - height) / 2
+ lp.topMargin - lp.bottomMargin;
child.layout(childLeft, childTop, childLeft + width, childTop + height);
}
}
}
@Override
public boolean shouldDelayChildPressedState() {
return false;
}
private int getPaddingLeftWithForeground() {
return isForegroundInsidePadding() ? Math.max(getPaddingLeft(), 0) :
getPaddingLeft() + 0;
}
private int getPaddingRightWithForeground() {
return isForegroundInsidePadding() ? Math.max(getPaddingRight(), 0) :
getPaddingRight() + 0;
}
private int getPaddingTopWithForeground() {
return isForegroundInsidePadding() ? Math.max(getPaddingTop(), 0) :
getPaddingTop() + 0;
}
private int getPaddingBottomWithForeground() {
return isForegroundInsidePadding() ? Math.max(getPaddingBottom(), 0) :
getPaddingBottom() + 0;
}
// A stub method for View's isForegroundInsidePadding() which is hidden.
// Always returns true for now, since the default value is true.
// See View's isForegroundInsidePadding method.
private boolean isForegroundInsidePadding() {
return true;
}
}