1 files changed, 110 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/filtershow/state/DragListener.java b/src/com/android/gallery3d/filtershow/state/DragListener.java
new file mode 100644
index 000000000..1aa81ed69
--- /dev/null
+++ b/src/com/android/gallery3d/filtershow/state/DragListener.java
@@ -0,0 +1,110 @@
+/*
+ * 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.gallery3d.filtershow.state;
+
+import android.view.DragEvent;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.LinearLayout;
+
+class DragListener implements View.OnDragListener {
+
+    private static final String LOGTAG = "DragListener";
+    private PanelTrack mStatePanelTrack;
+    private static float sSlope = 0.2f;
+
+    public DragListener(PanelTrack statePanelTrack) {
+        mStatePanelTrack = statePanelTrack;
+    }
+
+    private void setState(DragEvent event) {
+        float translation = event.getY() - mStatePanelTrack.getTouchPoint().y;
+        float alpha = 1.0f - (Math.abs(translation)
+                / mStatePanelTrack.getCurrentView().getHeight());
+        if (mStatePanelTrack.getOrientation() == LinearLayout.VERTICAL) {
+            translation = event.getX() - mStatePanelTrack.getTouchPoint().x;
+            alpha = 1.0f - (Math.abs(translation)
+                    / mStatePanelTrack.getCurrentView().getWidth());
+            mStatePanelTrack.getCurrentView().setTranslationX(translation);
+        } else {
+            mStatePanelTrack.getCurrentView().setTranslationY(translation);
+        }
+        mStatePanelTrack.getCurrentView().setBackgroundAlpha(alpha);
+    }
+
+    @Override
+    public boolean onDrag(View v, DragEvent event) {
+        switch (event.getAction()) {
+            case DragEvent.ACTION_DRAG_STARTED: {
+                break;
+            }
+            case DragEvent.ACTION_DRAG_LOCATION: {
+                if (mStatePanelTrack.getCurrentView() != null) {
+                    setState(event);
+                    View over = mStatePanelTrack.findChildAt((int) event.getX(),
+                                                             (int) event.getY());
+                    if (over != null && over != mStatePanelTrack.getCurrentView()) {
+                        StateView stateView = (StateView) over;
+                        if (stateView != mStatePanelTrack.getCurrentView()) {
+                            int pos = mStatePanelTrack.findChild(over);
+                            int origin = mStatePanelTrack.findChild(
+                                    mStatePanelTrack.getCurrentView());
+                            ArrayAdapter array = (ArrayAdapter) mStatePanelTrack.getAdapter();
+                            if (origin != -1 && pos != -1) {
+                                State current = (State) array.getItem(origin);
+                                array.remove(current);
+                                array.insert(current, pos);
+                                mStatePanelTrack.fillContent(false);
+                                mStatePanelTrack.setCurrentView(mStatePanelTrack.getChildAt(pos));
+                            }
+                        }
+                    }
+                }
+                break;
+            }
+            case DragEvent.ACTION_DRAG_ENTERED: {
+                mStatePanelTrack.setExited(false);
+                if (mStatePanelTrack.getCurrentView() != null) {
+                    mStatePanelTrack.getCurrentView().setVisibility(View.VISIBLE);
+                }
+                return true;
+            }
+            case DragEvent.ACTION_DRAG_EXITED: {
+                if (mStatePanelTrack.getCurrentView() != null) {
+                    setState(event);
+                    mStatePanelTrack.getCurrentView().setVisibility(View.INVISIBLE);
+                }
+                mStatePanelTrack.setExited(true);
+                break;
+            }
+            case DragEvent.ACTION_DROP: {
+                break;
+            }
+            case DragEvent.ACTION_DRAG_ENDED: {
+                if (mStatePanelTrack.getCurrentView() != null
+                        && mStatePanelTrack.getCurrentView().getAlpha() > sSlope) {
+                    setState(event);
+                }
+                mStatePanelTrack.checkEndState();
+                break;
+            }
+            default:
+                break;
+        }
+        return true;
+    }
+}