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Add pulsing spin animation #148

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Add pulsing spin animation #148

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15 changes: 15 additions & 0 deletions android-iconify/src/main/java/com/joanzapata/iconify/internal/Animation.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
package com.joanzapata.iconify.internal;

public enum Animation {
SPIN("spin"), PULSE("pulse"), NONE(null);

private final String token;

Animation(String token) {
this.token = token;
}

String getToken() {
return token;
}
}
38 changes: 29 additions & 9 deletions android-iconify/src/main/java/com/joanzapata/iconify/internal/CustomTypefaceSpan.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,19 @@
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.os.SystemClock;
import android.text.style.ReplacementSpan;
import com.joanzapata.iconify.Icon;

public class CustomTypefaceSpan extends ReplacementSpan {
private static final int ROTATION_DURATION = 2000;
// Font Awesome uses 8-step rotation for pulse, and
// it seems to have the only pulsing spinner. If
// spinners with different pulses are introduced at
// some point, then a pulse property can be
// implemented for the icons.
static final int ROTATION_PULSES = 8;
private static final int ROTATION_PULSE_DURATION = ROTATION_DURATION / ROTATION_PULSES;
private static final Rect TEXT_BOUNDS = new Rect();
private static final Paint LOCAL_PAINT = new Paint();
private static final float BASELINE_RATIO = 1 / 7f;
Expand All @@ -18,21 +26,21 @@ public class CustomTypefaceSpan extends ReplacementSpan {
private final float iconSizePx;
private final float iconSizeRatio;
private final int iconColor;
private final boolean rotate;
private final Animation animation;
private final boolean baselineAligned;
private final long rotationStartTime;

public CustomTypefaceSpan(Icon icon, Typeface type,
float iconSizePx, float iconSizeRatio, int iconColor,
boolean rotate, boolean baselineAligned) {
this.rotate = rotate;
Animation animation, boolean baselineAligned) {
this.animation = animation != null ? animation : Animation.NONE;
this.baselineAligned = baselineAligned;
this.icon = String.valueOf(icon.character());
this.type = type;
this.iconSizePx = iconSizePx;
this.iconSizeRatio = iconSizeRatio;
this.iconColor = iconColor;
this.rotationStartTime = System.currentTimeMillis();
this.rotationStartTime = SystemClock.uptimeMillis();
}

@Override
Expand All @@ -59,8 +67,20 @@ public void draw(Canvas canvas, CharSequence text,
paint.getTextBounds(icon, 0, 1, TEXT_BOUNDS);
canvas.save();
float baselineRatio = baselineAligned ? 0f : BASELINE_RATIO;
if (rotate) {
float rotation = (System.currentTimeMillis() - rotationStartTime) / (float) ROTATION_DURATION * 360f;
if (animation != Animation.NONE) {
long timeElapsed = SystemClock.uptimeMillis() - rotationStartTime;
float rotation;
switch (animation) {
case PULSE:
rotation = ((int) Math.floor(timeElapsed / (float) ROTATION_PULSE_DURATION))
* 360f / ROTATION_PULSES;
break;
case SPIN:
rotation = timeElapsed / (float) ROTATION_DURATION * 360f;
break;
default:
throw new IllegalStateException();
}
float centerX = x + TEXT_BOUNDS.width() / 2f;
float centerY = y - TEXT_BOUNDS.height() / 2f + TEXT_BOUNDS.height() * baselineRatio;
canvas.rotate(rotation, centerX, centerY);
Expand All @@ -72,15 +92,15 @@ public void draw(Canvas canvas, CharSequence text,
canvas.restore();
}

public boolean isAnimated() {
return rotate;
public Animation getAnimation() {
return animation;
}

private void applyCustomTypeFace(Paint paint, Typeface tf) {
paint.setFakeBoldText(false);
paint.setTextSkewX(0f);
paint.setTypeface(tf);
if (rotate) paint.clearShadowLayer();
if (animation != Animation.NONE) paint.clearShadowLayer();
if (iconSizeRatio > 0) paint.setTextSize(paint.getTextSize() * iconSizeRatio);
else if (iconSizePx > 0) paint.setTextSize(iconSizePx);
if (iconColor < Integer.MAX_VALUE) paint.setColor(iconColor);
Expand Down
42 changes: 31 additions & 11 deletions android-iconify/src/main/java/com/joanzapata/iconify/internal/ParsingUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,13 +33,14 @@ public static CharSequence parse(
recursivePrepareSpannableIndexes(context,
text.toString(), spannableBuilder,
iconFontDescriptors, 0);
boolean isAnimated = hasAnimatedSpans(spannableBuilder);
final Animation animation = getSpansAnimation(spannableBuilder);

// If animated, periodically invalidate the TextView so that the
// CustomTypefaceSpan can redraw itself
if (isAnimated) {
if (animation != Animation.NONE) {
if (target == null)
throw new IllegalArgumentException("You can't use \"spin\" without providing the target TextView.");
throw new IllegalArgumentException("You can't use \"" + animation.getToken() +
"\" without providing the target TextView.");
if (!(target instanceof HasOnViewAttachListener))
throw new IllegalArgumentException(target.getClass().getSimpleName() + " does not implement " +
"HasOnViewAttachListener. Please use IconTextView, IconButton or IconToggleButton.");
Expand All @@ -55,7 +56,14 @@ public void onAttach() {
public void run() {
if (isAttached) {
target.invalidate();
ViewCompat.postOnAnimation(target, this);
switch (animation) {
case SPIN:
ViewCompat.postOnAnimation(target, this);
break;
case PULSE:
ViewCompat.postOnAnimationDelayed(target, this, CustomTypefaceSpan.ROTATION_PULSES);
break;
}
}
}
});
Expand All @@ -74,13 +82,20 @@ public void onDetach() {
return spannableBuilder;
}

private static boolean hasAnimatedSpans(SpannableStringBuilder spannableBuilder) {
private static Animation getSpansAnimation(SpannableStringBuilder spannableBuilder) {
Animation animation = Animation.NONE;
CustomTypefaceSpan[] spans = spannableBuilder.getSpans(0, spannableBuilder.length(), CustomTypefaceSpan.class);
for (CustomTypefaceSpan span : spans) {
if (span.isAnimated())
return true;
Animation spanAnimation = span.getAnimation();
// Return the animation with the highest refresh rate
if (spanAnimation != Animation.NONE) {
animation = spanAnimation;
if (animation == Animation.SPIN) {
break;
}
}
}
return false;
return animation;
}

private static void recursivePrepareSpannableIndexes(
Expand Down Expand Up @@ -120,14 +135,19 @@ private static void recursivePrepareSpannableIndexes(
float iconSizePx = -1;
int iconColor = Integer.MAX_VALUE;
float iconSizeRatio = -1;
boolean spin = false;
Animation animation = Animation.NONE;
boolean baselineAligned = false;
for (int i = 1; i < strokes.length; i++) {
String stroke = strokes[i];

// Look for "spin"
if (stroke.equalsIgnoreCase("spin")) {
spin = true;
animation = Animation.SPIN;
}

// Look for "pulse"
else if (stroke.equalsIgnoreCase("pulse")) {
animation = Animation.PULSE;
}

// Look for "baseline"
Expand Down Expand Up @@ -174,7 +194,7 @@ else if (stroke.matches("#([0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})")) {
text = text.replace(startIndex, endIndex, "" + icon.character());
text.setSpan(new CustomTypefaceSpan(icon,
iconFontDescriptor.getTypeface(context),
iconSizePx, iconSizeRatio, iconColor, spin, baselineAligned),
iconSizePx, iconSizeRatio, iconColor, animation, baselineAligned),
startIndex, startIndex + 1,
Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
recursivePrepareSpannableIndexes(context, fullText, text, iconFontDescriptors, startIndex);
Expand Down