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Diffstat (limited to 'android/support/car/widget/PagedScrollBarView.java')
| -rw-r--r-- | android/support/car/widget/PagedScrollBarView.java | 264 |
1 files changed, 0 insertions, 264 deletions
diff --git a/android/support/car/widget/PagedScrollBarView.java b/android/support/car/widget/PagedScrollBarView.java deleted file mode 100644 index 1c46b5d4..00000000 --- a/android/support/car/widget/PagedScrollBarView.java +++ /dev/null @@ -1,264 +0,0 @@ -/* - * Copyright (C) 2017 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 android.support.car.widget; - -import android.content.Context; -import android.graphics.PorterDuff; -import android.graphics.drawable.Drawable; -import android.support.car.R; -import android.support.v4.content.ContextCompat; -import android.util.AttributeSet; -import android.view.LayoutInflater; -import android.view.View; -import android.view.ViewGroup; -import android.view.animation.AccelerateDecelerateInterpolator; -import android.view.animation.Interpolator; -import android.widget.FrameLayout; -import android.widget.ImageView; - -/** A custom view to provide list scroll behaviour -- up/down buttons and scroll indicator. */ -public class PagedScrollBarView extends FrameLayout - implements View.OnClickListener, View.OnLongClickListener { - private static final float BUTTON_DISABLED_ALPHA = 0.2f; - - @DayNightStyle private int mDayNightStyle; - - /** Listener for when the list should paginate. */ - public interface PaginationListener { - int PAGE_UP = 0; - int PAGE_DOWN = 1; - - /** Called when the linked view should be paged in the given direction */ - void onPaginate(int direction); - } - - private final ImageView mUpButton; - private final ImageView mDownButton; - private final ImageView mScrollThumb; - /** The "filler" view between the up and down buttons */ - private final View mFiller; - - private final Interpolator mPaginationInterpolator = new AccelerateDecelerateInterpolator(); - private final int mMinThumbLength; - private final int mMaxThumbLength; - private PaginationListener mPaginationListener; - - public PagedScrollBarView(Context context, AttributeSet attrs) { - this(context, attrs, 0 /*defStyleAttrs*/, 0 /*defStyleRes*/); - } - - public PagedScrollBarView(Context context, AttributeSet attrs, int defStyleAttrs) { - this(context, attrs, defStyleAttrs, 0 /*defStyleRes*/); - } - - public PagedScrollBarView( - Context context, AttributeSet attrs, int defStyleAttrs, int defStyleRes) { - super(context, attrs, defStyleAttrs, defStyleRes); - - LayoutInflater inflater = - (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); - inflater.inflate(R.layout.car_paged_scrollbar_buttons, this /* root */, - true /* attachToRoot */); - - mUpButton = (ImageView) findViewById(R.id.page_up); - mUpButton.setOnClickListener(this); - mUpButton.setOnLongClickListener(this); - mDownButton = (ImageView) findViewById(R.id.page_down); - mDownButton.setOnClickListener(this); - mDownButton.setOnLongClickListener(this); - - mScrollThumb = (ImageView) findViewById(R.id.scrollbar_thumb); - mFiller = findViewById(R.id.filler); - - mMinThumbLength = getResources().getDimensionPixelSize(R.dimen.min_thumb_height); - mMaxThumbLength = getResources().getDimensionPixelSize(R.dimen.max_thumb_height); - } - - @Override - public void onClick(View v) { - dispatchPageClick(v); - } - - @Override - public boolean onLongClick(View v) { - dispatchPageClick(v); - return true; - } - - /** Sets the icon to be used for the up button. */ - public void setUpButtonIcon(Drawable icon) { - mUpButton.setImageDrawable(icon); - } - - /** Sets the icon to be used for the down button. */ - public void setDownButtonIcon(Drawable icon) { - mDownButton.setImageDrawable(icon); - } - - /** - * Sets the listener that will be notified when the up and down buttons have been pressed. - * - * @param listener The listener to set. - */ - public void setPaginationListener(PaginationListener listener) { - mPaginationListener = listener; - } - - /** Returns {@code true} if the "up" button is pressed */ - public boolean isUpPressed() { - return mUpButton.isPressed(); - } - - /** Returns {@code true} if the "down" button is pressed */ - public boolean isDownPressed() { - return mDownButton.isPressed(); - } - - /** Sets the range, offset and extent of the scroll bar. See {@link View}. */ - public void setParameters(int range, int offset, int extent, boolean animate) { - // This method is where we take the computed parameters from the PagedLayoutManager and - // render it within the specified constraints ({@link #mMaxThumbLength} and - // {@link #mMinThumbLength}). - final int size = mFiller.getHeight() - mFiller.getPaddingTop() - mFiller.getPaddingBottom(); - - int thumbLength = extent * size / range; - thumbLength = Math.max(Math.min(thumbLength, mMaxThumbLength), mMinThumbLength); - - int thumbOffset = size - thumbLength; - if (isDownEnabled()) { - // We need to adjust the offset so that it fits into the possible space inside the - // filler with regarding to the constraints set by mMaxThumbLength and mMinThumbLength. - thumbOffset = (size - thumbLength) * offset / range; - } - - // Sets the size of the thumb and request a redraw if needed. - final ViewGroup.LayoutParams lp = mScrollThumb.getLayoutParams(); - if (lp.height != thumbLength) { - lp.height = thumbLength; - mScrollThumb.requestLayout(); - } - - moveY(mScrollThumb, thumbOffset, animate); - } - - /** - * Sets how this {@link PagedScrollBarView} responds to day/night configuration changes. By - * default, the PagedScrollBarView is darker in the day and lighter at night. - * - * @param dayNightStyle A value from {@link DayNightStyle}. - * @see DayNightStyle - */ - public void setDayNightStyle(@DayNightStyle int dayNightStyle) { - mDayNightStyle = dayNightStyle; - reloadColors(); - } - - /** - * Sets whether or not the up button on the scroll bar is clickable. - * - * @param enabled {@code true} if the up button is enabled. - */ - public void setUpEnabled(boolean enabled) { - mUpButton.setEnabled(enabled); - mUpButton.setAlpha(enabled ? 1f : BUTTON_DISABLED_ALPHA); - } - - /** - * Sets whether or not the down button on the scroll bar is clickable. - * - * @param enabled {@code true} if the down button is enabled. - */ - public void setDownEnabled(boolean enabled) { - mDownButton.setEnabled(enabled); - mDownButton.setAlpha(enabled ? 1f : BUTTON_DISABLED_ALPHA); - } - - /** - * Returns whether or not the down button on the scroll bar is clickable. - * - * @return {@code true} if the down button is enabled. {@code false} otherwise. - */ - public boolean isDownEnabled() { - return mDownButton.isEnabled(); - } - - /** Reload the colors for the current {@link DayNightStyle}. */ - private void reloadColors() { - int tint; - int thumbBackground; - int upDownBackgroundResId; - - switch (mDayNightStyle) { - case DayNightStyle.AUTO: - tint = ContextCompat.getColor(getContext(), R.color.car_tint); - thumbBackground = ContextCompat.getColor(getContext(), - R.color.car_scrollbar_thumb); - upDownBackgroundResId = R.drawable.car_pagination_background; - break; - case DayNightStyle.AUTO_INVERSE: - tint = ContextCompat.getColor(getContext(), R.color.car_tint_inverse); - thumbBackground = ContextCompat.getColor(getContext(), - R.color.car_scrollbar_thumb_inverse); - upDownBackgroundResId = R.drawable.car_pagination_background_inverse; - break; - case DayNightStyle.FORCE_NIGHT: - tint = ContextCompat.getColor(getContext(), R.color.car_tint_light); - thumbBackground = ContextCompat.getColor(getContext(), - R.color.car_scrollbar_thumb_light); - upDownBackgroundResId = R.drawable.car_pagination_background_night; - break; - case DayNightStyle.FORCE_DAY: - tint = ContextCompat.getColor(getContext(), R.color.car_tint_dark); - thumbBackground = ContextCompat.getColor(getContext(), - R.color.car_scrollbar_thumb_dark); - upDownBackgroundResId = R.drawable.car_pagination_background_day; - break; - default: - throw new IllegalArgumentException("Unknown DayNightStyle: " + mDayNightStyle); - } - - mScrollThumb.setBackgroundColor(thumbBackground); - - mUpButton.setColorFilter(tint, PorterDuff.Mode.SRC_IN); - mUpButton.setBackgroundResource(upDownBackgroundResId); - - mDownButton.setColorFilter(tint, PorterDuff.Mode.SRC_IN); - mDownButton.setBackgroundResource(upDownBackgroundResId); - } - - private void dispatchPageClick(View v) { - final PaginationListener listener = mPaginationListener; - if (listener == null) { - return; - } - - int direction = v.getId() == R.id.page_up - ? PaginationListener.PAGE_UP - : PaginationListener.PAGE_DOWN; - listener.onPaginate(direction); - } - - /** Moves the given view to the specified 'y' position. */ - private void moveY(final View view, float newPosition, boolean animate) { - final int duration = animate ? 200 : 0; - view.animate() - .y(newPosition) - .setDuration(duration) - .setInterpolator(mPaginationInterpolator) - .start(); - } -} |