1 files changed, 127 insertions, 0 deletions
diff --git a/src/com/android/camera/ui/ProgressRenderer.java b/src/com/android/camera/ui/ProgressRenderer.java
new file mode 100644
index 000000000..500293133
--- /dev/null
+++ b/src/com/android/camera/ui/ProgressRenderer.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2013 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;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+
+import com.android.camera2.R;
+
+/**
+ * Renders a circular progress bar on the screen.
+ */
+public class ProgressRenderer {
+
+    public static interface VisibilityListener {
+        public void onHidden();
+    }
+
+    private final int mProgressRadius;
+    private final Paint mProgressBasePaint;
+    private final Paint mProgressPaint;
+
+    private RectF mArcBounds = new RectF(0, 0, 1, 1);
+    private int mProgressAngleDegrees = 270;
+    private boolean mVisible = false;
+    private VisibilityListener mVisibilityListener;
+
+    /**
+     * After we reach 100%, keep on painting the progress for another x milliseconds
+     * before hiding it.
+     */
+    private static final int SHOW_PROGRESS_X_ADDITIONAL_MS = 100;
+
+    /** When to hide the progress indicator. */
+    private long mTimeToHide = 0;
+
+    public ProgressRenderer(Context context) {
+        mProgressRadius = context.getResources().getDimensionPixelSize(R.dimen.pie_progress_radius);
+        int pieProgressWidth = context.getResources().getDimensionPixelSize(
+                R.dimen.pie_progress_width);
+        mProgressBasePaint = createProgressPaint(pieProgressWidth, 0.2f);
+        mProgressPaint = createProgressPaint(pieProgressWidth, 1.0f);
+    }
+
+    /**
+     * Sets or replaces a visiblity listener.
+     */
+    public void setVisibilityListener(VisibilityListener listener) {
+        mVisibilityListener = listener;
+    }
+
+    /**
+     * Shows a progress indicator. If the progress is '100', the progress
+     * indicator will be hidden.
+     *
+     * @param percent the progress in percent (0-100).
+     */
+    public void setProgress(int percent) {
+        // Clamp the value.
+        percent = Math.min(100, Math.max(percent, 0));
+        mProgressAngleDegrees = (int) ((360f / 100) * percent);
+
+        // We hide the progress once we drew the 100% state once.
+        if (percent < 100) {
+            mVisible = true;
+            mTimeToHide = System.currentTimeMillis() + SHOW_PROGRESS_X_ADDITIONAL_MS;
+        }
+    }
+
+    /**
+     * Draw the current progress (if < 100%) centered at the given location.
+     */
+    public void onDraw(Canvas canvas, int centerX, int centerY) {
+        if (!mVisible) {
+            return;
+        }
+        mArcBounds = new RectF(centerX - mProgressRadius, centerY - mProgressRadius, centerX
+                + mProgressRadius,
+                centerY + mProgressRadius);
+
+        canvas.drawCircle(centerX, centerY, mProgressRadius, mProgressBasePaint);
+        canvas.drawArc(mArcBounds, -90, mProgressAngleDegrees, false, mProgressPaint);
+
+        // After we reached 100%, we paint the progress renderer for another x
+        // milliseconds until we hide it.
+        if (mProgressAngleDegrees == 360 && System.currentTimeMillis() > mTimeToHide) {
+            mVisible = false;
+            if (mVisibilityListener != null) {
+                mVisibilityListener.onHidden();
+            }
+        }
+    }
+
+    /**
+     * @return Whether the progress renderer is visible.
+     */
+    public boolean isVisible() {
+        return mVisible;
+    }
+
+    private static Paint createProgressPaint(int width, float alpha) {
+        Paint paint = new Paint();
+        paint.setAntiAlias(true);
+        // 20% alpha.
+        paint.setColor(Color.argb((int) (alpha * 255), 255, 255, 255));
+        paint.setStrokeWidth(width);
+        paint.setStyle(Paint.Style.STROKE);
+        return paint;
+    }
+}