1 files changed, 153 insertions, 0 deletions
diff --git a/src/com/android/camera/ZoomPicker.java b/src/com/android/camera/ZoomPicker.java
new file mode 100644
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+++ b/src/com/android/camera/ZoomPicker.java
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+/*
+ * Copyright (C) 2010 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;
+
+import android.content.Context;
+import android.os.Handler;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.view.MotionEvent;
+import android.view.ViewConfiguration;
+import android.view.View.OnTouchListener;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import java.util.Formatter;
+
+/**
+ * A view for increasing or decresing zoom
+ */
+public class ZoomPicker extends LinearLayout {
+    private final String TAG = "ZoomPicker";
+    private TextView mText;
+    private int mZoomMax, mZoomIndex;
+    private float[] mZoomRatios;
+    private OnZoomChangedListener mListener;
+    private boolean mIncrement, mDecrement;
+    private final StringBuilder mBuilder = new StringBuilder();
+    private final Formatter mFormatter = new Formatter(mBuilder);
+    private final Object[] mFormatterArgs = new Object[1];
+
+    private Handler mHandler;
+    private final Runnable mRunnable = new Runnable() {
+        public void run() {
+            if (mIncrement) {
+                if (changeZoomIndex(mZoomIndex + 1)) {
+                    mHandler.postDelayed(this, 65);
+                }
+            } else if (mDecrement) {
+                if (changeZoomIndex(mZoomIndex - 1)) {
+                    mHandler.postDelayed(this, 65);
+                }
+            }
+        }
+    };
+
+    public ZoomPicker(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mHandler = new Handler();
+
+        OnTouchListener incrementTouchListener = new OnTouchListener() {
+            public boolean onTouch(View v, MotionEvent event) {
+                if (event.getAction() == MotionEvent.ACTION_DOWN) {
+                    if (!mIncrement && changeZoomIndex(mZoomIndex + 1)) {
+                        mIncrement = true;
+                        // Give bigger delay so users can tap to change only one
+                        // zoom step.
+                        mHandler.postDelayed(mRunnable, 200);
+                    }
+                } else if (event.getAction() == MotionEvent.ACTION_UP) {
+                    mIncrement = false;
+                }
+                return false;
+            }
+        };
+
+        OnTouchListener decrementTouchListener = new OnTouchListener() {
+            public boolean onTouch(View v, MotionEvent event) {
+                if (event.getAction() == MotionEvent.ACTION_DOWN) {
+                    if (!mDecrement && changeZoomIndex(mZoomIndex - 1)) {
+                        mDecrement = true;
+                        // Give bigger delay so users can tap to change only one
+                        // zoom step.
+                        mHandler.postDelayed(mRunnable, 200);
+                    }
+                } else if (event.getAction() == MotionEvent.ACTION_UP) {
+                    mDecrement = false;
+                }
+                return false;
+            }
+        };
+
+        Button incrementButton = (Button) findViewById(R.id.increment);
+        incrementButton.setOnTouchListener(incrementTouchListener);
+        Button decrementButton = (Button) findViewById(R.id.decrement);
+        decrementButton.setOnTouchListener(decrementTouchListener);
+        mText = (TextView) findViewById(R.id.zoom_ratio);
+        mText.setText(formatZoomRatio(1.0f));
+    }
+
+    public void setOnZoomChangeListener(OnZoomChangedListener listener) {
+        mListener = listener;
+    }
+
+    public interface OnZoomChangedListener {
+        void onZoomChanged(int index);
+    }
+
+    public void setZoomRatios(float[] zoomRatios) {
+        mZoomMax = zoomRatios.length - 1;
+        mZoomRatios = zoomRatios;
+        updateView();
+    }
+
+    public void setZoomIndex(int index) {
+        if (index < 0 || index > mZoomMax) {
+            throw new IllegalArgumentException("Invalid zoom value:" + index);
+        }
+        mZoomIndex = index;
+        updateView();
+    }
+
+    private boolean changeZoomIndex(int index) {
+        if (index > mZoomMax || index < 0) return false;
+        mZoomIndex = index;
+        if (mListener != null) {
+            mListener.onZoomChanged(mZoomIndex);
+        }
+        updateView();
+        return true;
+    }
+
+    private void updateView() {
+        mText.setText(formatZoomRatio(mZoomRatios[mZoomIndex]));
+    }
+
+    private String formatZoomRatio(float value) {
+        mFormatterArgs[0] = value;
+        mBuilder.delete(0, mBuilder.length());
+        mFormatter.format("%2.1fx", mFormatterArgs);
+        return mFormatter.toString();
+    }
+}