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app/src/main/java/com/hippo/drawable/DrawerArrowDrawable.java

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+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * 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 com.hippo.drawable;
+
+import android.animation.ObjectAnimator;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+
+import com.hippo.ehviewer.R;
+import com.hippo.yorozuya.MathUtils;
+
+/**
+ * A drawable that can draw a "Drawer hamburger" menu or an Arrow and animate between them.
+ */
+public class DrawerArrowDrawable extends Drawable {
+
+    private final Paint mPaint = new Paint();
+
+    // The angle in degress that the arrow head is inclined at.
+    private static final float ARROW_HEAD_ANGLE = (float) Math.toRadians(45);
+    private final float mBarThickness;
+    // The length of top and bottom bars when they merge into an arrow
+    private final float mTopBottomArrowSize;
+    // The length of middle bar
+    private final float mBarSize;
+    // The length of the middle bar when arrow is shaped
+    private final float mMiddleArrowSize;
+    // The space between bars when they are parallel
+    private final float mBarGap;
+    // Whether bars should spin or not during progress
+    private final boolean mSpin;
+    // Use Path instead of canvas operations so that if color has transparency, overlapping sections
+    // wont look different
+    private final Path mPath = new Path();
+    // The reported intrinsic size of the drawable.
+    private final int mSize;
+    // Whether we should mirror animation when animation is reversed.
+    private boolean mVerticalMirror = false;
+    // The interpolated version of the original progress
+    private float mProgress;
+    // the amount that overlaps w/ bar size when rotation is max
+    private float mMaxCutForBarSize;
+
+    /**
+     * @param context used to get the configuration for the drawable from
+     */
+    public DrawerArrowDrawable(Context context) {
+        Resources resources = context.getResources();
+
+        mPaint.setAntiAlias(true);
+        mPaint.setColor(resources.getColor(R.color.primary_drawable_light));
+        mSize = resources.getDimensionPixelSize(R.dimen.dad_drawable_size);
+        // round this because having this floating may cause bad measurements
+        mBarSize = Math.round(resources.getDimension(R.dimen.dad_bar_size));
+        // round this because having this floating may cause bad measurements
+        mTopBottomArrowSize = Math.round(resources.getDimension(R.dimen.dad_top_bottom_bar_arrow_size));
+        mBarThickness = resources.getDimension(R.dimen.dad_thickness);
+        // round this because having this floating may cause bad measurements
+        mBarGap = Math.round(resources.getDimension(R.dimen.dad_gap_between_bars));
+        mSpin = resources.getBoolean(R.bool.dad_spin_bars);
+        mMiddleArrowSize = resources.getDimension(R.dimen.dad_middle_bar_arrow_size);
+
+        mPaint.setStyle(Paint.Style.STROKE);
+        mPaint.setStrokeJoin(Paint.Join.MITER);
+        mPaint.setStrokeCap(Paint.Cap.BUTT);
+        mPaint.setStrokeWidth(mBarThickness);
+
+        mMaxCutForBarSize = (float) (mBarThickness / 2 * Math.cos(ARROW_HEAD_ANGLE));
+    }
+
+    /**
+     * If set, canvas is flipped when progress reached to end and going back to start.
+     */
+    protected void setVerticalMirror(boolean verticalMirror) {
+        mVerticalMirror = verticalMirror;
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        Rect bounds = getBounds();
+        // Interpolated widths of arrow bars
+        final float arrowSize = MathUtils.lerp(mBarSize, mTopBottomArrowSize, mProgress);
+        final float middleBarSize = MathUtils.lerp(mBarSize, mMiddleArrowSize, mProgress);
+        // Interpolated size of middle bar
+        final float middleBarCut = Math.round(MathUtils.lerp(0, mMaxCutForBarSize, mProgress));
+        // The rotation of the top and bottom bars (that make the arrow head)
+        final float rotation = MathUtils.lerp(0, ARROW_HEAD_ANGLE, mProgress);
+
+        // The whole canvas rotates as the transition happens
+        final float canvasRotate = MathUtils.lerp(-180, 0, mProgress);
+        final float arrowWidth = Math.round(arrowSize * Math.cos(rotation));
+        final float arrowHeight = Math.round(arrowSize * Math.sin(rotation));
+
+        mPath.rewind();
+        final float topBottomBarOffset = MathUtils.lerp(mBarGap + mBarThickness, -mMaxCutForBarSize,
+                mProgress);
+
+        final float arrowEdge = -middleBarSize / 2;
+        // draw middle bar
+        mPath.moveTo(arrowEdge + middleBarCut, 0);
+        mPath.rLineTo(middleBarSize - middleBarCut * 2, 0);
+
+        // bottom bar
+        mPath.moveTo(arrowEdge, topBottomBarOffset);
+        mPath.rLineTo(arrowWidth, arrowHeight);
+
+        // top bar
+        mPath.moveTo(arrowEdge, -topBottomBarOffset);
+        mPath.rLineTo(arrowWidth, -arrowHeight);
+
+        mPath.close();
+
+        canvas.save();
+        // Rotate the whole canvas if spinning, if not, rotate it 180 to get
+        // the arrow pointing the other way for RTL.
+        canvas.translate(bounds.centerX(), bounds.centerY());
+        if (mSpin) {
+            canvas.rotate(canvasRotate * (mVerticalMirror ? -1 : 1));
+        }
+        canvas.drawPath(mPath, mPaint);
+
+        canvas.restore();
+    }
+
+    @Override
+    public void setAlpha(int i) {
+        mPaint.setAlpha(i);
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        mPaint.setColorFilter(colorFilter);
+    }
+
+    @Override
+    public int getIntrinsicHeight() {
+        return mSize;
+    }
+
+    @Override
+    public int getIntrinsicWidth() {
+        return mSize;
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+
+    @SuppressWarnings("unused")
+    public float getProgress() {
+        return mProgress;
+    }
+
+    @SuppressWarnings("unused")
+    public void setProgress(float progress) {
+        if (progress == 1f) {
+            setVerticalMirror(true);
+        } else if (progress == 0f) {
+            setVerticalMirror(false);
+        }
+        mProgress = progress;
+        invalidateSelf();
+    }
+
+    public void setMenu(long duration) {
+        setShape(false, duration);
+    }
+
+    public void setArrow(long duration) {
+        setShape(true, duration);
+    }
+
+    public void setShape(boolean arrow, long duration) {
+        if (!((!arrow && mProgress == 0f) || (arrow && mProgress == 1f))) {
+            float endProgress = arrow ? 1f : 0f;
+            if (duration <= 0) {
+                setProgress(endProgress);
+            } else {
+                ObjectAnimator oa = ObjectAnimator.ofFloat(this, "progress", endProgress);
+                oa.setDuration(duration);
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+                    oa.setAutoCancel(true);
+                }
+                oa.start();
+            }
+        }
+    }
+}