Resize the preview frame as large as possible.

Now, we will calculate the layout by ourselves in PreviewFrameLayout.

Change-Id: I90f91f9df6d2f75fbd31fc930af624a84820bc95

1 files changed, 123 insertions, 0 deletions

diff --git a/src/com/android/camera/PreviewFrameLayout.java b/src/com/android/camera/PreviewFrameLayout.java
new file mode 100644
index 0000000..c8af838
--- /dev/null
+++ b/src/com/android/camera/PreviewFrameLayout.java
@@ -0,0 +1,123 @@
+/*
+ * 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.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.FrameLayout;
+
+public class PreviewFrameLayout extends ViewGroup {
+    private double mAspectRatio = 4.0 / 3.0;
+    private ImageView mGripper;
+    private FrameLayout mFrame;
+
+    public PreviewFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        mGripper = (ImageView) findViewById(R.id.btn_gripper);
+        mFrame = (FrameLayout) findViewById(R.id.frame);
+        if (mFrame == null) {
+            throw new IllegalStateException(
+                    "must provide child with id as \"frame\"");
+        }
+    }
+
+    public void setAspectRatio(double ratio) {
+        if (ratio <= 0.0) throw new IllegalArgumentException();
+
+        if (mAspectRatio != ratio) {
+            mAspectRatio = ratio;
+            requestLayout();
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+        int gripperWidth = 0;
+        int gripperHeight = 0;
+
+        if (mGripper != null) {
+            measureChild(mGripper, widthMeasureSpec, heightMeasureSpec);
+            gripperWidth = mGripper.getMeasuredWidth();
+            gripperHeight = mGripper.getMeasuredHeight();
+        }
+
+        int frameWidth = getMeasuredWidth() - gripperWidth;
+        int frameHeight = getMeasuredHeight();
+
+        FrameLayout f = mFrame;
+
+        int horizontalPadding = f.getPaddingLeft() + f.getPaddingRight();
+        int verticalPadding = f.getPaddingBottom() + f.getPaddingTop();
+
+        int previewWidth = frameWidth - horizontalPadding;
+        int previewHeight = frameHeight - verticalPadding;
+
+        // resize frame and preview for aspect ratio
+        if (previewWidth > previewHeight * mAspectRatio) {
+            previewWidth = (int) (previewHeight * mAspectRatio + .5);
+        } else {
+            previewHeight = (int) (previewWidth / mAspectRatio + .5);
+        }
+        frameWidth = previewWidth + horizontalPadding;
+        frameHeight = previewHeight + verticalPadding;
+
+        measureChild(mFrame,
+                MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameWidth),
+                MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameHeight));
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        // Try to layout the "frame" in the center of the area, and put
+        // "gripper" just to the left of it. If there is no enough space for
+        // the gripper, the "frame" will be moved a little right so that
+        // they won't overlap with each other.
+
+        int frameWidth = mFrame.getMeasuredWidth();
+        int frameHeight = mFrame.getMeasuredHeight();
+
+        int leftSpace = ((r - l) - frameWidth) / 2;
+        int topSpace = ((b - t) - frameHeight) / 2;
+
+        int gripperWidth = 0;
+        int gripperHeight = 0;
+        if (mGripper != null) {
+            gripperWidth = mGripper.getMeasuredWidth();
+            gripperHeight = mGripper.getMeasuredHeight();
+            myLayoutChild(mGripper,
+                    Math.max(l, l + (leftSpace - gripperWidth)),
+                    t + ((b - t) - gripperHeight) / 2,
+                    gripperWidth, gripperHeight);
+        }
+        myLayoutChild(mFrame, Math.max(l + leftSpace, l + gripperWidth),
+                t + topSpace, frameWidth, frameHeight);
+    }
+
+    private static void myLayoutChild(View child, int l, int t, int w, int h) {
+        child.layout(l, t, l + w, t + h);
+    }
+}
+