1 files changed, 197 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/AlbumView.java b/src/com/android/gallery3d/ui/AlbumView.java
new file mode 100644
index 000000000..417611a69
--- /dev/null
+++ b/src/com/android/gallery3d/ui/AlbumView.java
@@ -0,0 +1,197 @@
+/*
+ * 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.gallery3d.ui;
+
+import com.android.gallery3d.app.GalleryActivity;
+import com.android.gallery3d.data.MediaItem;
+import com.android.gallery3d.ui.PositionRepository.Position;
+
+import android.graphics.Rect;
+
+public class AlbumView extends SlotView {
+    @SuppressWarnings("unused")
+    private static final String TAG = "AlbumView";
+    private static final int CACHE_SIZE = 64;
+
+    private int mVisibleStart = 0;
+    private int mVisibleEnd = 0;
+
+    private AlbumSlidingWindow mDataWindow;
+    private final GalleryActivity mActivity;
+    private SelectionDrawer mSelectionDrawer;
+    private int mSlotWidth, mSlotHeight;
+    private int mDisplayItemSize;
+
+    private boolean mIsActive = false;
+
+    public static interface Model {
+        public int size();
+        public MediaItem get(int index);
+        public void setActiveWindow(int start, int end);
+        public void setModelListener(ModelListener listener);
+    }
+
+    public static interface ModelListener {
+        public void onWindowContentChanged(int index);
+        public void onSizeChanged(int size);
+    }
+
+    public AlbumView(GalleryActivity activity,
+            int slotWidth, int slotHeight, int displayItemSize) {
+        super(activity.getAndroidContext());
+        mSlotWidth = slotWidth;
+        mSlotHeight = slotHeight;
+        mDisplayItemSize = displayItemSize;
+        setSlotSize(slotWidth, slotHeight);
+        mActivity = activity;
+    }
+
+    public void setSelectionDrawer(SelectionDrawer drawer) {
+        mSelectionDrawer = drawer;
+        if (mDataWindow != null) mDataWindow.setSelectionDrawer(drawer);
+    }
+
+    public void setModel(Model model) {
+        if (mDataWindow != null) {
+            mDataWindow.setListener(null);
+            setSlotCount(0);
+            mDataWindow = null;
+        }
+        if (model != null) {
+            mDataWindow = new AlbumSlidingWindow(
+                    mActivity, model, CACHE_SIZE,
+                    mSlotWidth, mSlotHeight, mDisplayItemSize);
+            mDataWindow.setSelectionDrawer(mSelectionDrawer);
+            mDataWindow.setListener(new MyDataModelListener());
+            setSlotCount(model.size());
+            updateVisibleRange(getVisibleStart(), getVisibleEnd());
+        }
+    }
+
+    public void setFocusIndex(int slotIndex) {
+        if (mDataWindow != null) {
+            mDataWindow.setFocusIndex(slotIndex);
+        }
+    }
+
+    private void putSlotContent(int slotIndex, DisplayItem item) {
+        Rect rect = getSlotRect(slotIndex);
+        Position position = new Position(
+                (rect.left + rect.right) / 2, (rect.top + rect.bottom) / 2, 0);
+        putDisplayItem(position, position, item);
+    }
+
+    private void updateVisibleRange(int start, int end) {
+        if (start == mVisibleStart && end == mVisibleEnd) {
+            // we need to set the mDataWindow active range in any case.
+            mDataWindow.setActiveWindow(start, end);
+            return;
+        }
+
+        if (!mIsActive) {
+            mVisibleStart = start;
+            mVisibleEnd = end;
+            mDataWindow.setActiveWindow(start, end);
+            return;
+        }
+
+        if (start >= mVisibleEnd || mVisibleStart >= end) {
+            for (int i = mVisibleStart, n = mVisibleEnd; i < n; ++i) {
+                DisplayItem item = mDataWindow.get(i);
+                if (item != null) removeDisplayItem(item);
+            }
+            mDataWindow.setActiveWindow(start, end);
+            for (int i = start; i < end; ++i) {
+                putSlotContent(i, mDataWindow.get(i));
+            }
+        } else {
+            for (int i = mVisibleStart; i < start; ++i) {
+                DisplayItem item = mDataWindow.get(i);
+                if (item != null) removeDisplayItem(item);
+            }
+            for (int i = end, n = mVisibleEnd; i < n; ++i) {
+                DisplayItem item = mDataWindow.get(i);
+                if (item != null) removeDisplayItem(item);
+            }
+            mDataWindow.setActiveWindow(start, end);
+            for (int i = start, n = mVisibleStart; i < n; ++i) {
+                putSlotContent(i, mDataWindow.get(i));
+            }
+            for (int i = mVisibleEnd; i < end; ++i) {
+                putSlotContent(i, mDataWindow.get(i));
+            }
+        }
+
+        mVisibleStart = start;
+        mVisibleEnd = end;
+    }
+
+    @Override
+    protected void onLayoutChanged(int width, int height) {
+        // Reput all the items
+        updateVisibleRange(0, 0);
+        updateVisibleRange(getVisibleStart(), getVisibleEnd());
+    }
+
+    @Override
+    protected void onScrollPositionChanged(int position) {
+        super.onScrollPositionChanged(position);
+        updateVisibleRange(getVisibleStart(), getVisibleEnd());
+    }
+
+    @Override
+    protected void render(GLCanvas canvas) {
+        mSelectionDrawer.prepareDrawing();
+        super.render(canvas);
+    }
+
+    private class MyDataModelListener implements AlbumSlidingWindow.Listener {
+
+        public void onContentInvalidated() {
+            invalidate();
+        }
+
+        public void onSizeChanged(int size) {
+            // If the layout parameters are changed, we need reput all items.
+            if (setSlotCount(size)) updateVisibleRange(0, 0);
+            updateVisibleRange(getVisibleStart(), getVisibleEnd());
+            invalidate();
+        }
+
+        public void onWindowContentChanged(
+                int slotIndex, DisplayItem old, DisplayItem update) {
+            removeDisplayItem(old);
+            putSlotContent(slotIndex, update);
+        }
+    }
+
+    public void resume() {
+        mIsActive = true;
+        mDataWindow.resume();
+        for (int i = mVisibleStart, n = mVisibleEnd; i < n; ++i) {
+            putSlotContent(i, mDataWindow.get(i));
+        }
+    }
+
+    public void pause() {
+        mIsActive = false;
+        for (int i = mVisibleStart, n = mVisibleEnd; i < n; ++i) {
+            removeDisplayItem(mDataWindow.get(i));
+        }
+        mDataWindow.pause();
+    }
+}