1 files changed, 136 insertions, 0 deletions
diff --git a/src/com/android/camera/PreviewFrameLayout.java b/src/com/android/camera/PreviewFrameLayout.java
new file mode 100644
index 000000000..03ef91c60
--- /dev/null
+++ b/src/com/android/camera/PreviewFrameLayout.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2009 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.content.res.Configuration;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewStub;
+import android.widget.RelativeLayout;
+
+import com.android.camera.ui.LayoutChangeHelper;
+import com.android.camera.ui.LayoutChangeNotifier;
+import com.android.gallery3d.R;
+import com.android.gallery3d.common.ApiHelper;
+
+/**
+ * A layout which handles the preview aspect ratio.
+ */
+public class PreviewFrameLayout extends RelativeLayout implements LayoutChangeNotifier {
+
+    private static final String TAG = "CAM_preview";
+
+    /** A callback to be invoked when the preview frame's size changes. */
+    public interface OnSizeChangedListener {
+        public void onSizeChanged(int width, int height);
+    }
+
+    private double mAspectRatio;
+    private View mBorder;
+    private OnSizeChangedListener mListener;
+    private LayoutChangeHelper mLayoutChangeHelper;
+
+    public PreviewFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setAspectRatio(4.0 / 3.0);
+        mLayoutChangeHelper = new LayoutChangeHelper(this);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        mBorder = findViewById(R.id.preview_border);
+    }
+
+    public void setAspectRatio(double ratio) {
+        if (ratio <= 0.0) throw new IllegalArgumentException();
+
+        if (mAspectRatio != ratio) {
+            mAspectRatio = ratio;
+            requestLayout();
+        }
+    }
+
+    public void showBorder(boolean enabled) {
+        mBorder.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
+    }
+
+    public void fadeOutBorder() {
+        Util.fadeOut(mBorder);
+    }
+
+    @Override
+    protected void onMeasure(int widthSpec, int heightSpec) {
+        int previewWidth = MeasureSpec.getSize(widthSpec);
+        int previewHeight = MeasureSpec.getSize(heightSpec);
+
+        if (!ApiHelper.HAS_SURFACE_TEXTURE) {
+            // Get the padding of the border background.
+            int hPadding = getPaddingLeft() + getPaddingRight();
+            int vPadding = getPaddingTop() + getPaddingBottom();
+
+            // Resize the preview frame with correct aspect ratio.
+            previewWidth -= hPadding;
+            previewHeight -= vPadding;
+
+            boolean widthLonger = previewWidth > previewHeight;
+            int longSide = (widthLonger ? previewWidth : previewHeight);
+            int shortSide = (widthLonger ? previewHeight : previewWidth);
+            if (longSide > shortSide * mAspectRatio) {
+                longSide = (int) ((double) shortSide * mAspectRatio);
+            } else {
+                shortSide = (int) ((double) longSide / mAspectRatio);
+            }
+            if (widthLonger) {
+                previewWidth = longSide;
+                previewHeight = shortSide;
+            } else {
+                previewWidth = shortSide;
+                previewHeight = longSide;
+            }
+
+            // Add the padding of the border.
+            previewWidth += hPadding;
+            previewHeight += vPadding;
+        }
+
+        // Ask children to follow the new preview dimension.
+        super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
+                MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
+    }
+
+    public void setOnSizeChangedListener(OnSizeChangedListener listener) {
+        mListener = listener;
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        if (mListener != null) mListener.onSizeChanged(w, h);
+    }
+
+    @Override
+    public void setOnLayoutChangeListener(
+            LayoutChangeNotifier.Listener listener) {
+        mLayoutChangeHelper.setOnLayoutChangeListener(listener);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        super.onLayout(changed, l, t, r, b);
+        mLayoutChangeHelper.onLayout(changed, l, t, r, b);
+    }
+}