40 lines
2.4 KiB
Java
40 lines
2.4 KiB
Java
package androidx.recyclerview.widget;
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import android.view.View;
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import androidx.recyclerview.widget.RecyclerView;
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public class ScrollbarHelper {
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private ScrollbarHelper() {
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}
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public static int computeScrollExtent(RecyclerView.State state, OrientationHelper orientationHelper, View view, View view2, RecyclerView.LayoutManager layoutManager, boolean z2) {
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if (layoutManager.getChildCount() == 0 || state.getItemCount() == 0 || view == null || view2 == null) {
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return 0;
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}
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if (!z2) {
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return Math.abs(layoutManager.getPosition(view) - layoutManager.getPosition(view2)) + 1;
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}
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return Math.min(orientationHelper.getTotalSpace(), orientationHelper.getDecoratedEnd(view2) - orientationHelper.getDecoratedStart(view));
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}
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public static int computeScrollOffset(RecyclerView.State state, OrientationHelper orientationHelper, View view, View view2, RecyclerView.LayoutManager layoutManager, boolean z2, boolean z3) {
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if (layoutManager.getChildCount() == 0 || state.getItemCount() == 0 || view == null || view2 == null) {
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return 0;
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}
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int max = z3 ? Math.max(0, (state.getItemCount() - Math.max(layoutManager.getPosition(view), layoutManager.getPosition(view2))) - 1) : Math.max(0, Math.min(layoutManager.getPosition(view), layoutManager.getPosition(view2)));
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if (!z2) {
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return max;
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}
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return Math.round((((float) max) * (((float) Math.abs(orientationHelper.getDecoratedEnd(view2) - orientationHelper.getDecoratedStart(view))) / ((float) (Math.abs(layoutManager.getPosition(view) - layoutManager.getPosition(view2)) + 1)))) + ((float) (orientationHelper.getStartAfterPadding() - orientationHelper.getDecoratedStart(view))));
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}
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public static int computeScrollRange(RecyclerView.State state, OrientationHelper orientationHelper, View view, View view2, RecyclerView.LayoutManager layoutManager, boolean z2) {
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if (layoutManager.getChildCount() == 0 || state.getItemCount() == 0 || view == null || view2 == null) {
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return 0;
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}
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if (!z2) {
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return state.getItemCount();
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}
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return (int) ((((float) (orientationHelper.getDecoratedEnd(view2) - orientationHelper.getDecoratedStart(view))) / ((float) (Math.abs(layoutManager.getPosition(view) - layoutManager.getPosition(view2)) + 1))) * ((float) state.getItemCount()));
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}
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}
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