1 files changed, 140 insertions, 0 deletions
diff --git a/src/com/android/calculator2/PanelSwitcher.java b/src/com/android/calculator2/PanelSwitcher.java
new file mode 100644
index 0000000..c64022c
--- /dev/null
+++ b/src/com/android/calculator2/PanelSwitcher.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2008 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.calculator2;
+
+import android.view.animation.TranslateAnimation;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.GestureDetector;
+import android.widget.FrameLayout;
+import android.content.Context;
+import android.util.AttributeSet;
+import android.os.Handler;
+
+import java.util.Map;
+
+class PanelSwitcher extends FrameLayout {
+    private static final int MAJOR_MOVE = 60;
+    private static final int ANIM_DURATION = 400;
+
+    private GestureDetector mGestureDetector;
+    private int mCurrentView;
+    private View mChild, mHistoryView;
+    private View children[];
+
+    private int mWidth;
+    private TranslateAnimation inLeft;
+    private TranslateAnimation outLeft;
+
+    private TranslateAnimation inRight;
+    private TranslateAnimation outRight;
+
+    private static final int NONE  = 1;
+    private static final int LEFT  = 2;
+    private static final int RIGHT = 3;
+    private int mPreviousMove;
+
+    public PanelSwitcher(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mCurrentView = 0;
+        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
+                public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
+                                       float velocityY) {
+                    int dx = (int) (e2.getX() - e1.getX());
+
+                    // don't accept the fling if it's too short
+                    // as it may conflict with a button push
+                    if (Math.abs(dx) > MAJOR_MOVE && Math.abs(velocityX) > Math.abs(velocityY)) {
+                        if (velocityX > 0) {
+                            moveRight();
+                        } else {
+                            moveLeft();
+                        }
+                        return true;
+                    } else {
+                        return false;
+                    }
+                }
+            });
+    }
+
+    @Override 
+    public void onSizeChanged(int w, int h, int oldW, int oldH) {
+        mWidth = w;
+        inLeft   = new TranslateAnimation(mWidth, 0, 0, 0);
+        outLeft  = new TranslateAnimation(0, -mWidth, 0, 0);        
+        inRight  = new TranslateAnimation(-mWidth, 0, 0, 0);
+        outRight = new TranslateAnimation(0, mWidth, 0, 0);
+
+        inLeft.setDuration(ANIM_DURATION);
+        outLeft.setDuration(ANIM_DURATION);
+        inRight.setDuration(ANIM_DURATION);
+        outRight.setDuration(ANIM_DURATION);
+    }
+
+    protected void onFinishInflate() {
+        int count = getChildCount();
+        children = new View[count];
+        for (int i = 0; i < count; ++i) {
+            children[i] = getChildAt(i);
+            if (i != mCurrentView) {
+                children[i].setVisibility(View.GONE);
+            }
+        }
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        mGestureDetector.onTouchEvent(event);
+        return true;
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent event) {
+        return mGestureDetector.onTouchEvent(event);
+    }
+
+    void moveLeft() {
+        //  <--
+        if (mCurrentView < children.length - 1 && mPreviousMove != LEFT) {
+            children[mCurrentView+1].setVisibility(View.VISIBLE);
+            children[mCurrentView+1].startAnimation(inLeft);
+            children[mCurrentView].startAnimation(outLeft);
+            children[mCurrentView].setVisibility(View.GONE);
+
+            mCurrentView++;
+            mPreviousMove = LEFT;
+        }
+    }
+
+    void moveRight() {
+        //  -->
+        if (mCurrentView > 0 && mPreviousMove != RIGHT) {
+            children[mCurrentView-1].setVisibility(View.VISIBLE);
+            children[mCurrentView-1].startAnimation(inRight);
+            children[mCurrentView].startAnimation(outRight);
+            children[mCurrentView].setVisibility(View.GONE);
+
+            mCurrentView--;
+            mPreviousMove = RIGHT;
+        }
+    }
+
+    int getCurrentIndex() {
+        return mCurrentView;
+    }
+}