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Commit 42069e4

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arthufimtcevarthufimtcev
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Add LinearGradientDrawable convenience Builder
1 parent a09586b commit 42069e4

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3 files changed

+126
-20
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3 files changed

+126
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‎android-ui-toolkit/src/main/java/io/supernova/uitoolkit/drawable/LinearGradientDrawable.java‎

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package io.supernova.uitoolkit.drawable;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorFilter;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.support.annotation.ColorInt;
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import android.support.annotation.ColorRes;
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import android.support.annotation.DimenRes;
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import android.support.annotation.Dimension;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.support.annotation.RequiresApi;
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import android.support.v4.content.ContextCompat;
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import android.util.TypedValue;
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import java.util.ArrayList;
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import java.util.Arrays;
@@ -209,4 +215,103 @@ private RectF getFloatReusableBounds() {
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private boolean hasStroke() {
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return this.strokePaint.getStrokeWidth() != 0;
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}
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public static class Builder {
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@NonNull
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private Context context;
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private final PointF start;
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private final PointF end;
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private final List<GradientStop> stops = new ArrayList<>();
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private float cornerRadius = 0f;
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private float strokeWidth = 0f;
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@ColorInt
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private int strokeColor = Color.TRANSPARENT;
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public Builder(@NonNull Context context, @NonNull PointF start, @NonNull PointF end) {
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this.context = context;
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this.start = start;
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this.end = end;
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}
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/* STOPS */
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public Builder addStop(GradientStop stop) {
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this.stops.add(stop);
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return this;
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}
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public Builder addStop(float position, @ColorInt int color) {
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return this.addStop(new GradientStop(position, color));
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}
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public Builder addStopWithResource(float position, @ColorRes int color) {
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return this.addStop(new GradientStop(position, ContextCompat.getColor(context, color)));
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}
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/* RAW VALUES */
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public Builder cornerRadiusPx(@Dimension float cornerRadius) {
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this.cornerRadius = cornerRadius;
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return this;
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}
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public Builder strokeWidthPx(@Dimension float width) {
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this.strokeWidth = width;
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return this;
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}
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public Builder cornerRadiusDp(@Dimension float radius) {
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this.cornerRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, radius, this.context.getResources().getDisplayMetrics());
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return this;
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}
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public Builder strokeWidthDp(@Dimension float width) {
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this.strokeWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, width, this.context.getResources().getDisplayMetrics());
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return this;
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}
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public Builder strokeColor(@ColorInt int color) {
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this.strokeColor = color;
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return this;
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}
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/* RESOURCE VALUES */
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public Builder cornerRadius(@DimenRes int cornerRadiusRes) {
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this.cornerRadius = this.context.getResources().getDimension(cornerRadiusRes);
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return this;
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}
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public Builder strokeWidth(@DimenRes int strokeWidthRes) {
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this.strokeWidth = this.context.getResources().getDimension(strokeWidthRes);
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return this;
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}
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public Builder strokeColorRes(@ColorRes int strokeColorRes) {
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this.strokeColor = ContextCompat.getColor(this.context, strokeColorRes);
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return this;
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}
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/* BUILD */
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public LinearGradientDrawable build() {
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LinearGradientDrawable gradient = new LinearGradientDrawable(this.start, this.end, this.stops);
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gradient.setStrokeColor(this.strokeColor);
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gradient.setStrokeWidth(this.strokeWidth);
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gradient.setCornerRadius(this.cornerRadius);
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return gradient;
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}
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}
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}

‎app/src/main/java/io/supernova/toolkit/example/MainActivity.java‎

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import android.graphics.Color;
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import android.graphics.PointF;
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import android.graphics.drawable.GradientDrawable;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.text.SpannableString;
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import android.text.Spanned;
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import android.util.TypedValue;
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import android.view.View;
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import android.widget.TextView;
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import io.supernova.supernovauitoolkit.R;
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import io.supernova.uitoolkit.drawable.GradientStop;
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import io.supernova.uitoolkit.drawable.LinearGradientDrawable;
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import io.supernova.uitoolkit.text.LetterSpacingSpan;
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import io.supernova.uitoolkit.text.LineHeightSpan;
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private void setupGradient() {
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// Create GradientStop array defining colors their position
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// GradientStop position must be between 0 and 1
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GradientStop[] stops = {
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new GradientStop(0, Color.BLUE),
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new GradientStop(0.3f, Color.BLACK),
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new GradientStop(0.6f, Color.WHITE),
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new GradientStop(1, Color.RED)
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};
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// Create gradient and pass it as the background to the view
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//
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// LinearGradientDrawable.Builder requires context to convert resource references and DP dimensions to pixels and
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// start and end points that define the gradient orientation.
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this.gradientView.setBackground(new LinearGradientDrawable.Builder(this, new PointF(0, 0), new PointF(1, 1))
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// Stops
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.addStop(0, Color.BLUE)
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.addStop(0.3f, Color.BLACK)
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.addStop(0.6f, Color.WHITE)
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.addStopWithResource(1, R.color.colorPrimaryDark)
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// Create LinearGradientDrawable with the stops, define gradient angle with 2 points
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LinearGradientDrawable linearGradientDrawable = new LinearGradientDrawable(new PointF(0, 0), new PointF(1, 1), stops);
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// Corner radius resource
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.cornerRadius(R.dimen.test_gradient_corner_radius)
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// Set gradient corner radius in DPs
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linearGradientDrawable.setCornerRadius(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 12, this.getResources().getDisplayMetrics()));
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// Stroke width converted from DPs
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.strokeWidthDp(2)
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// Set gradient stroke
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linearGradientDrawable.setStrokeWidth(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, this.getResources().getDisplayMetrics()));
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linearGradientDrawable.setStrokeColor(Color.BLACK);
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// Stroke color resource
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.strokeColorRes(R.color.colorPrimary)
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// Pass gradient to the view
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this.gradientView.setBackground(linearGradientDrawable);
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.build());
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}
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}

‎app/src/main/res/values/dimens.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<dimen name="test_gradient_corner_radius">8dp</dimen>
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</resources>

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