appcompat/appcompat/src/main/java/androidx/appcompat/widget/AppCompatSeekBarHelper.java

/*
 * Copyright (C) 2015 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.appcompat.widget;

import android.content.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.SeekBar;

import androidx.annotation.Nullable;
import androidx.appcompat.R;
import androidx.core.graphics.drawable.DrawableCompat;
import androidx.core.view.ViewCompat;

class AppCompatSeekBarHelper extends AppCompatProgressBarHelper {

    private final SeekBar mView;

    private Drawable mTickMark;
    private ColorStateList mTickMarkTintList = null;
    private PorterDuff.Mode mTickMarkTintMode = null;
    private boolean mHasTickMarkTint = false;
    private boolean mHasTickMarkTintMode = false;

    AppCompatSeekBarHelper(SeekBar view) {
        super(view);
        mView = view;
    }

    @Override
    void loadFromAttributes(AttributeSet attrs, int defStyleAttr) {
        super.loadFromAttributes(attrs, defStyleAttr);

        TintTypedArray a = TintTypedArray.obtainStyledAttributes(mView.getContext(), attrs,
                R.styleable.AppCompatSeekBar, defStyleAttr, 0);
        ViewCompat.saveAttributeDataForStyleable(mView, mView.getContext(),
                R.styleable.AppCompatSeekBar, attrs, a.getWrappedTypeArray(),
                defStyleAttr, 0);
        final Drawable drawable = a.getDrawableIfKnown(R.styleable.AppCompatSeekBar_android_thumb);
        if (drawable != null) {
            mView.setThumb(drawable);
        }

        final Drawable tickMark = a.getDrawable(R.styleable.AppCompatSeekBar_tickMark);
        setTickMark(tickMark);

        if (a.hasValue(R.styleable.AppCompatSeekBar_tickMarkTintMode)) {
            mTickMarkTintMode = DrawableUtils.parseTintMode(a.getInt(
                    R.styleable.AppCompatSeekBar_tickMarkTintMode, -1), mTickMarkTintMode);
            mHasTickMarkTintMode = true;
        }

        if (a.hasValue(R.styleable.AppCompatSeekBar_tickMarkTint)) {
            mTickMarkTintList = a.getColorStateList(R.styleable.AppCompatSeekBar_tickMarkTint);
            mHasTickMarkTint = true;
        }

        a.recycle();

        applyTickMarkTint();
    }

    void setTickMark(@Nullable Drawable tickMark) {
        if (mTickMark != null) {
            mTickMark.setCallback(null);
        }

        mTickMark = tickMark;

        if (tickMark != null) {
            tickMark.setCallback(mView);
            DrawableCompat.setLayoutDirection(tickMark, ViewCompat.getLayoutDirection(mView));
            if (tickMark.isStateful()) {
                tickMark.setState(mView.getDrawableState());
            }
            applyTickMarkTint();
        }

        mView.invalidate();
    }

    @Nullable
    Drawable getTickMark() {
        return mTickMark;
    }

    void setTickMarkTintList(@Nullable ColorStateList tint) {
        mTickMarkTintList = tint;
        mHasTickMarkTint = true;

        applyTickMarkTint();
    }

    @Nullable
    ColorStateList getTickMarkTintList() {
        return mTickMarkTintList;
    }

    void setTickMarkTintMode(@Nullable PorterDuff.Mode tintMode) {
        mTickMarkTintMode = tintMode;
        mHasTickMarkTintMode = true;

        applyTickMarkTint();
    }

    @Nullable
    PorterDuff.Mode getTickMarkTintMode() {
        return mTickMarkTintMode;
    }

    private void applyTickMarkTint() {
        if (mTickMark != null && (mHasTickMarkTint || mHasTickMarkTintMode)) {
            mTickMark = DrawableCompat.wrap(mTickMark.mutate());

            if (mHasTickMarkTint) {
                DrawableCompat.setTintList(mTickMark, mTickMarkTintList);
            }

            if (mHasTickMarkTintMode) {
                DrawableCompat.setTintMode(mTickMark, mTickMarkTintMode);
            }

            // The drawable (or one of its children) may not have been
            // stateful before applying the tint, so let's try again.
            if (mTickMark.isStateful()) {
                mTickMark.setState(mView.getDrawableState());
            }
        }
    }

    void jumpDrawablesToCurrentState() {
        if (mTickMark != null) {
            mTickMark.jumpToCurrentState();
        }
    }

    void drawableStateChanged() {
        final Drawable tickMark = mTickMark;
        if (tickMark != null && tickMark.isStateful()
                && tickMark.setState(mView.getDrawableState())) {
            mView.invalidateDrawable(tickMark);
        }
    }

    /**
     * Draw the tick marks.
     */
    void drawTickMarks(Canvas canvas) {
        if (mTickMark != null) {
            final int count = mView.getMax();
            if (count > 1) {
                final int w = mTickMark.getIntrinsicWidth();
                final int h = mTickMark.getIntrinsicHeight();
                final int halfW = w >= 0 ? w / 2 : 1;
                final int halfH = h >= 0 ? h / 2 : 1;
                mTickMark.setBounds(-halfW, -halfH, halfW, halfH);

                final float spacing = (mView.getWidth() - mView.getPaddingLeft()
                        - mView.getPaddingRight()) / (float) count;
                final int saveCount = canvas.save();
                canvas.translate(mView.getPaddingLeft(), mView.getHeight() / 2);
                for (int i = 0; i <= count; i++) {
                    mTickMark.draw(canvas);
                    canvas.translate(spacing, 0);
                }
                canvas.restoreToCount(saveCount);
            }
        }
    }

}