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Diffstat (limited to 'src/com/android/camera/ui/focus/ManualFocusRing.java')
-rw-r--r--src/com/android/camera/ui/focus/ManualFocusRing.java93
1 files changed, 93 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/focus/ManualFocusRing.java b/src/com/android/camera/ui/focus/ManualFocusRing.java
new file mode 100644
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+++ b/src/com/android/camera/ui/focus/ManualFocusRing.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.camera.ui.focus;
+
+import android.graphics.Canvas;
+import android.graphics.Paint;
+
+import com.android.camera.ui.motion.InterpolateUtils;
+import com.android.camera.ui.motion.Invalidator;
+
+/**
+ * Manual focus ring animation renderer.
+ */
+class ManualFocusRing extends FocusRingRenderer {
+ /**
+ * The manual focus ring encapsulates the animation logic for visualizing
+ * a focus event when triggered by a physical screen touch.
+ *
+ * @param invalidator the object to invalidate while running.
+ * @param ringPaint the paint to draw the ring with.
+ * @param exitDurationMillis the fade out time in milliseconds.
+ */
+ public ManualFocusRing(Invalidator invalidator, Paint ringPaint,
+ float exitDurationMillis) {
+ super(invalidator, ringPaint, 0.0f, exitDurationMillis);
+ }
+
+ @Override
+ public void draw(long t, long dt, Canvas canvas) {
+ float ringRadius = mRingRadius.update(dt);
+ processStates(t);
+
+ if (!isActive()) {
+ return;
+ }
+
+ mInvalidator.invalidate();
+ int ringAlpha = 255;
+
+ if (mFocusState == FocusState.STATE_FADE_OUT) {
+ float rFade = InterpolateUtils.unitRatio(t, mExitStartMillis, mExitDurationMillis);
+ ringAlpha = (int) InterpolateUtils.lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
+ } else if (mFocusState == FocusState.STATE_HARD_STOP) {
+ float rFade = InterpolateUtils.unitRatio(t, mHardExitStartMillis,
+ mHardExitDurationMillis);
+ ringAlpha = (int) InterpolateUtils.lerp(255, 0, mExitOpacityCurve.valueAt(rFade));
+ } else if (mFocusState == FocusState.STATE_INACTIVE) {
+ ringAlpha = 0;
+ }
+
+ mRingPaint.setAlpha(ringAlpha);
+ canvas.drawCircle(getCenterX(), getCenterY(), ringRadius, mRingPaint);
+ }
+
+ private void processStates(long t) {
+ if (mFocusState == FocusState.STATE_INACTIVE) {
+ return;
+ }
+
+ if (mFocusState == FocusState.STATE_ENTER
+ && (t > mEnterStartMillis + mEnterDurationMillis)) {
+ mFocusState = FocusState.STATE_ACTIVE;
+ }
+
+ if (mFocusState == FocusState.STATE_ACTIVE && !mRingRadius.isActive()) {
+ mFocusState = FocusState.STATE_FADE_OUT;
+ mExitStartMillis = t;
+ }
+
+ if (mFocusState == FocusState.STATE_FADE_OUT && t > mExitStartMillis + mExitDurationMillis) {
+ mFocusState = FocusState.STATE_INACTIVE;
+ }
+
+ if (mFocusState == FocusState.STATE_HARD_STOP
+ && t > mHardExitStartMillis + mHardExitDurationMillis) {
+ mFocusState = FocusState.STATE_INACTIVE;
+ }
+ }
+}