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Use white or black text for category chip, depending on brighness of background

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This commit is contained in:
Peter Serwylo 2017-06-16 11:01:37 +10:00
parent 444ba43ac0
commit 963996b412
1 changed files with 10 additions and 2 deletions
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12
app/src/main/java/org/fdroid/fdroid/views/apps/CategorySpan.java
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@ -97,6 +97,8 @@ public class CategorySpan extends ReplacementSpan {
RectF backgroundRect = new RectF(0, 0, iconBackgroundSize + textLeadingPadding
+ textWidth + textTrailingPadding, height);
int backgroundColour = CategoryController.getBackgroundColour(context, categoryName.toString());
// The shadow below the entire category chip.
canvas.save();
canvas.translate(0, DROP_SHADOW_HEIGHT * density);
@ -108,7 +110,7 @@ public class CategorySpan extends ReplacementSpan {
// The background which goes behind the text.
Paint backgroundPaint = new Paint();
backgroundPaint.setColor(CategoryController.getBackgroundColour(context, categoryName.toString()));
backgroundPaint.setColor(backgroundColour);
backgroundPaint.setAntiAlias(true);
canvas.drawRoundRect(backgroundRect, cornerRadius, cornerRadius, backgroundPaint);
@ -124,9 +126,15 @@ public class CategorySpan extends ReplacementSpan {
icon.setBounds(iconPadding, iconPadding, iconPadding + iconSize, iconPadding + iconSize);
icon.draw(canvas);
// Choose white or black text based on the perceived brightness.
// Uses some arbitrary magic from https://stackoverflow.com/a/946734/2391921
double grey = Color.red(backgroundColour) * 0.299 +
Color.green(backgroundColour) * 0.587 +
Color.blue(backgroundColour) * 0.114;
// The category name drawn to the right of the category name.
Paint textPaint = new Paint(paint);
textPaint.setColor(Color.WHITE);
textPaint.setColor(grey < 186 ? Color.WHITE : Color.BLACK);
canvas.drawText(categoryName.toString(), iconBackgroundSize + textLeadingPadding, bottom, textPaint);
canvas.restore();