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react-native-linear-gradient
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optimize render performance for rounded corners on Android

This commit is contained in:
Dmitry Gladkov 2016-01-20 14:11:24 +02:00
parent 8bc029dc14
commit 48728d6d19
1 changed files with 22 additions and 9 deletions
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31
android/src/main/java/com/BV/LinearGradient/LinearGradientView.java
View File

@ -6,7 +6,7 @@ import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;
import android.view.View;
@ -14,6 +14,8 @@ import android.view.View;
public class LinearGradientView extends View {
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Path mPathForBorderRadius;
private RectF mTempRectForBorderRadius;
private LinearGradient mShader;
private float[] mLocations;
@ -60,12 +62,14 @@ public class LinearGradientView extends View {
public void setBorderRadius(float borderRadius) {
mBorderRadius = borderRadius;
updatePath();
drawGradient();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mSize = new int[]{w, h};
updatePath();
drawGradient();
}
@ -82,18 +86,27 @@ public class LinearGradientView extends View {
invalidate();
}
private void updatePath() {
if (mPathForBorderRadius == null) {
mPathForBorderRadius = new Path();
mTempRectForBorderRadius = new RectF();
}
mPathForBorderRadius.reset();
mTempRectForBorderRadius.set(0f, 0f, (float) mSize[0], (float) mSize[1]);
mPathForBorderRadius.addRoundRect(
mTempRectForBorderRadius,
mBorderRadius,
mBorderRadius,
Path.Direction.CW);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBorderRadius != 0f) {
RectF clipBounds = new RectF(canvas.getClipBounds());
canvas.drawRoundRect(
clipBounds,
mBorderRadius,
mBorderRadius,
mPaint);
} else {
if (mPathForBorderRadius == null) {
canvas.drawPaint(mPaint);
} else {
canvas.drawPath(mPathForBorderRadius, mPaint);
}
}
}