mirror of
https://github.com/material-components/material-components-android.git
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79b2c3d7c5
Use canvas.clipRect() to avoid drawing strokes in cutout areas instead of painting-it-white approach we are using right now. PiperOrigin-RevId: 413246249
101 lines
3.1 KiB
Java
101 lines
3.1 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.material.textfield;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Paint.Style;
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import android.graphics.PorterDuff.Mode;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.RectF;
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import android.graphics.Region.Op;
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import android.os.Build.VERSION;
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import android.os.Build.VERSION_CODES;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import com.google.android.material.shape.MaterialShapeDrawable;
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import com.google.android.material.shape.ShapeAppearanceModel;
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/**
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* A {@link MaterialShapeDrawable} that can draw a cutout for the label in {@link TextInputLayout}'s
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* outline mode.
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*/
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class CutoutDrawable extends MaterialShapeDrawable {
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@NonNull private final Paint cutoutPaint;
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@NonNull private final RectF cutoutBounds;
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CutoutDrawable() {
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this(null);
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}
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CutoutDrawable(@Nullable ShapeAppearanceModel shapeAppearanceModel) {
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super(shapeAppearanceModel != null ? shapeAppearanceModel : new ShapeAppearanceModel());
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cutoutPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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setPaintStyles();
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cutoutBounds = new RectF();
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}
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private void setPaintStyles() {
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cutoutPaint.setStyle(Style.FILL_AND_STROKE);
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cutoutPaint.setColor(Color.WHITE);
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cutoutPaint.setXfermode(new PorterDuffXfermode(Mode.DST_OUT));
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}
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boolean hasCutout() {
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return !cutoutBounds.isEmpty();
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}
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void setCutout(float left, float top, float right, float bottom) {
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// Avoid expensive redraws by only calling invalidateSelf if one of the cutout's dimensions has
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// changed.
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if (left != cutoutBounds.left
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|| top != cutoutBounds.top
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|| right != cutoutBounds.right
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|| bottom != cutoutBounds.bottom) {
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cutoutBounds.set(left, top, right, bottom);
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invalidateSelf();
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}
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}
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void setCutout(@NonNull RectF bounds) {
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setCutout(bounds.left, bounds.top, bounds.right, bounds.bottom);
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}
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void removeCutout() {
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// Call setCutout with empty bounds to remove the cutout.
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setCutout(0, 0, 0, 0);
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}
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@Override
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protected void drawStrokeShape(@NonNull Canvas canvas) {
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if (cutoutBounds.isEmpty()) {
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super.drawStrokeShape(canvas);
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} else {
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// Saves the canvas so we can restore the clip after drawing the stroke.
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canvas.save();
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if (VERSION.SDK_INT >= VERSION_CODES.O) {
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canvas.clipOutRect(cutoutBounds);
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} else {
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canvas.clipRect(cutoutBounds, Op.DIFFERENCE);
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}
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super.drawStrokeShape(canvas);
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canvas.restore();
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}
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}
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}
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