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fix text node shadow & gradient conflict
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doric-android/doric/src/main/java/pub/doric/shader/DoricTextView.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| package pub.doric.shader; | ||
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| import android.annotation.SuppressLint; | ||
| import android.content.Context; | ||
| import android.graphics.Canvas; | ||
| import android.graphics.Color; | ||
| import android.graphics.LinearGradient; | ||
| import android.graphics.Paint; | ||
| import android.graphics.Rect; | ||
| import android.graphics.Shader; | ||
| import android.text.Layout; | ||
| import android.util.AttributeSet; | ||
| import android.widget.TextView; | ||
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| import androidx.annotation.Nullable; | ||
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| @SuppressLint("AppCompatCustomView") | ||
| public class DoricTextView extends TextView { | ||
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| private boolean strikethrough = false; | ||
| private boolean underline = false; | ||
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| private float shadowAlpha = 0; | ||
| private float shadowRadius = 0; | ||
| private float shadowDx = 0; | ||
| private float shadowDy = 0; | ||
| private int shadowColor = Color.TRANSPARENT; | ||
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| private float gradientAngle = 0; | ||
| private int[] gradientColors = null; | ||
| private float[] gradientPositions = null; | ||
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| public DoricTextView(Context context) { | ||
| super(context); | ||
| } | ||
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| public DoricTextView(Context context, @Nullable AttributeSet attrs) { | ||
| super(context, attrs); | ||
| } | ||
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| public DoricTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { | ||
| super(context, attrs, defStyleAttr); | ||
| } | ||
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| public void setShadow(float alpha, float radius, float dx, float dy, int color) { | ||
| this.shadowAlpha = alpha; | ||
| this.shadowRadius = radius; | ||
| this.shadowDx = dx; | ||
| this.shadowDy = dy; | ||
| this.shadowColor = color; | ||
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| getPaint().setAlpha((int) (255 * alpha)); | ||
| getPaint().setShadowLayer(radius, dx, dy, color); | ||
| } | ||
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| public boolean hasShadow() { | ||
| return this.shadowAlpha > 0; | ||
| } | ||
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| public void setGradient(float angle, int[] colors, float[] positions) { | ||
| this.gradientAngle = angle; | ||
| this.gradientColors = colors; | ||
| this.gradientPositions = positions; | ||
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| invalidate(); | ||
| } | ||
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| public boolean hasGradient() { | ||
| return this.gradientColors != null; | ||
| } | ||
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| public void setUnderline(boolean underline) { | ||
| this.underline = underline; | ||
| getPaint().setUnderlineText(underline); | ||
| } | ||
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| public void setStrikethrough(boolean strikethrough) { | ||
| this.strikethrough = strikethrough; | ||
| getPaint().setStrikeThruText(strikethrough); | ||
| } | ||
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| @Override | ||
| protected void onDraw(Canvas canvas) { | ||
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| if (hasGradient()) { | ||
| if (hasShadow() || strikethrough || underline) { | ||
| getPaint().setShader(null); | ||
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| // draw the shadow | ||
| if (hasShadow()) { | ||
| // shadowColor must be opaque. | ||
| setTextColor(0x00ffffff); | ||
| getPaint().setAlpha((int) (255 * shadowAlpha)); | ||
| getPaint().setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor); | ||
| } | ||
| getPaint().setStrikeThruText(strikethrough); | ||
| getPaint().setUnderlineText(underline); | ||
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| super.onDraw(canvas); | ||
| } | ||
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| // draw the gradient filled text | ||
| if (hasShadow()) { | ||
| getPaint().clearShadowLayer(); | ||
| } | ||
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| // gradient colors must be opaque, too. | ||
| setGradientTextColor(this, this.gradientAngle, this.gradientColors, this.gradientPositions); | ||
| super.onDraw(canvas); | ||
| } else { | ||
| super.onDraw(canvas); | ||
| } | ||
| } | ||
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| public static void setGradientTextColor(final TextView textView, final float angle, final int[] colors, final float[] positions) { | ||
| final Rect textBound = new Rect(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE); | ||
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| final Layout layout = textView.getLayout(); | ||
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| if (layout == null) { | ||
| return; | ||
| } | ||
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| for (int i = 0; i < textView.getLineCount(); i++) { | ||
| float left = layout.getLineLeft(i); | ||
| float right = layout.getLineRight(i); | ||
| if (left < textBound.left) textBound.left = (int) left; | ||
| if (right > textBound.right) textBound.right = (int) right; | ||
| } | ||
| textBound.top = layout.getLineTop(0); | ||
| textBound.bottom = layout.getLineBottom(textView.getLineCount() - 1); | ||
| if (textView.getIncludeFontPadding()) { | ||
| Paint.FontMetrics fontMetrics = textView.getPaint().getFontMetrics(); | ||
| textBound.top += (fontMetrics.ascent - fontMetrics.top); | ||
| textBound.bottom -= (fontMetrics.bottom - fontMetrics.descent); | ||
| } | ||
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| double angleInRadians = Math.toRadians(angle); | ||
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| double r = Math.sqrt(Math.pow(textBound.bottom - textBound.top, 2) + | ||
| Math.pow(textBound.right - textBound.left, 2)) / 2; | ||
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| float centerX = textBound.left + (textBound.right - textBound.left) / 2.f; | ||
| float centerY = textBound.top + (textBound.bottom - textBound.top) / 2.f; | ||
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| float startX = (float) (centerX - r * Math.cos(angleInRadians)); | ||
| float startY = (float) (centerY + r * Math.sin(angleInRadians)); | ||
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| float endX = (float) (centerX + r * Math.cos(angleInRadians)); | ||
| float endY = (float) (centerY - r * Math.sin(angleInRadians)); | ||
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| Shader textShader = new LinearGradient(startX, startY, endX, endY, colors, positions, | ||
| Shader.TileMode.CLAMP); | ||
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| textView.setTextColor(0xffffffff); | ||
| textView.getPaint().setShader(textShader); | ||
| } | ||
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| public void reset() { | ||
| strikethrough = false; | ||
| underline = false; | ||
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| shadowAlpha = 0; | ||
| shadowRadius = 0; | ||
| shadowDx = 0; | ||
| shadowDy = 0; | ||
| shadowColor = Color.TRANSPARENT; | ||
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| gradientAngle = 0; | ||
| gradientColors = null; | ||
| gradientPositions = null; | ||
| invalidate(); | ||
| } | ||
| } |
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