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Android: impl text color with gradient

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王劲鹏 2021-07-19 16:30:22 +08:00 committed by osborn
parent 4a0c8bd171
commit a1240cfa2e
1 changed files with 123 additions and 4 deletions
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127
doric-android/doric/src/main/java/pub/doric/shader/TextNode.java
View File

@ -15,9 +15,15 @@
*/
package pub.doric.shader;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.text.Html;
import android.text.Layout;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.Gravity;
@ -71,7 +77,7 @@ public class TextNode extends ViewNode<TextView> {
}
@Override
protected void blend(TextView view, String name, JSValue prop) {
protected void blend(final TextView view, String name, final JSValue prop) {
switch (name) {
case "text":
if (!prop.isString()) {
@ -86,10 +92,83 @@ public class TextNode extends ViewNode<TextView> {
view.setTextSize(TypedValue.COMPLEX_UNIT_DIP, prop.asNumber().toFloat());
break;
case "textColor":
if (!prop.isNumber()) {
return;
}
if (prop.isNumber()) {
view.setTextColor(prop.asNumber().toInt());
} else if (prop.isObject()) {
view.post(new Runnable() {
@Override
public void run() {
final JSObject dict = prop.asObject();
LinearGradient linearGradient = null;
int[] colors = null;
float[] locations = null;
if (dict.propertySet().contains("colors")) {
JSValue colorsValue = dict.getProperty("colors");
if (colorsValue.isArray()) {
colors = colorsValue.asArray().toIntArray();
}
if (dict.propertySet().contains("locations")) {
JSValue locationsValue = dict.getProperty("locations");
if (locationsValue.isArray()) {
locations = locationsValue.asArray().toFloatArray();
}
}
} else {
if (dict.propertySet().contains("start") && dict.propertySet().contains("end")) {
JSValue start = dict.getProperty("start");
JSValue end = dict.getProperty("end");
if (start.isNumber() && end.isNumber()) {
colors = new int[]{start.asNumber().toInt(), end.asNumber().toInt()};
}
}
}
if (colors == null) {
colors = new int[]{Color.TRANSPARENT, Color.TRANSPARENT};
}
JSValue orientation = dict.getProperty("orientation");
float width = view.getMeasuredWidth();
float height = view.getMeasuredHeight();
float angle = 0;
if (orientation.isNumber()) {
switch (orientation.asNumber().toInt()) {
case 0:
angle = 270;
break;
case 1:
angle = (float) Math.toDegrees(Math.atan2(-width, -height));
break;
case 2:
angle = 180;
break;
case 3:
angle = (float) Math.toDegrees(Math.atan2(width, -height));
break;
case 4:
angle = 90;
break;
case 5:
angle = (float) Math.toDegrees(Math.atan2(width, height));
break;
case 6:
angle = 0;
break;
case 7:
angle = (float) Math.toDegrees(Math.atan2(-width, height));
break;
}
}
setGradientTextColor(view, angle, colors, locations);
}
});
}
break;
case "textAlignment":
if (!prop.isNumber()) {
@ -239,4 +318,44 @@ public class TextNode extends ViewNode<TextView> {
break;
}
}
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);
final Layout layout = textView.getLayout();
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);
}
double angleInRadians = Math.toRadians(angle);
double r = Math.sqrt(Math.pow(textBound.bottom - textBound.top, 2) +
Math.pow(textBound.right - textBound.left, 2)) / 2;
float centerX = textBound.left + (textBound.right - textBound.left) / 2.f;
float centerY = textBound.top + (textBound.bottom - textBound.top) / 2.f;
float startX = (float) (centerX - r * Math.cos(angleInRadians));
float startY = (float) (centerY + r * Math.sin(angleInRadians));
float endX = (float) (centerX + r * Math.cos(angleInRadians));
float endY = (float) (centerY - r * Math.sin(angleInRadians));
Shader textShader = new LinearGradient(startX, startY, endX, endY, colors, positions,
Shader.TileMode.CLAMP);
textView.setTextColor(Color.WHITE);
textView.getPaint().setShader(textShader);
textView.invalidate();
}
}