1 files changed, 132 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/EdgeView.java b/src/com/android/gallery3d/ui/EdgeView.java
new file mode 100644
index 000000000..051de18fa
--- /dev/null
+++ b/src/com/android/gallery3d/ui/EdgeView.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2011 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 android.content.Context;
+import android.opengl.Matrix;
+
+import com.android.gallery3d.glrenderer.GLCanvas;
+
+// EdgeView draws EdgeEffect (blue glow) at four sides of the view.
+public class EdgeView extends GLView {
+    @SuppressWarnings("unused")
+    private static final String TAG = "EdgeView";
+
+    public static final int INVALID_DIRECTION = -1;
+    public static final int TOP = 0;
+    public static final int LEFT = 1;
+    public static final int BOTTOM = 2;
+    public static final int RIGHT = 3;
+
+    // Each edge effect has a transform matrix, and each matrix has 16 elements.
+    // We put all the elements in one array. These constants specify the
+    // starting index of each matrix.
+    private static final int TOP_M = TOP * 16;
+    private static final int LEFT_M = LEFT * 16;
+    private static final int BOTTOM_M = BOTTOM * 16;
+    private static final int RIGHT_M = RIGHT * 16;
+
+    private EdgeEffect[] mEffect = new EdgeEffect[4];
+    private float[] mMatrix = new float[4 * 16];
+
+    public EdgeView(Context context) {
+        for (int i = 0; i < 4; i++) {
+            mEffect[i] = new EdgeEffect(context);
+        }
+    }
+
+    @Override
+    protected void onLayout(
+            boolean changeSize, int left, int top, int right, int bottom) {
+        if (!changeSize) return;
+
+        int w = right - left;
+        int h = bottom - top;
+        for (int i = 0; i < 4; i++) {
+            if ((i & 1) == 0) {  // top or bottom
+                mEffect[i].setSize(w, h);
+            } else {  // left or right
+                mEffect[i].setSize(h, w);
+            }
+        }
+
+        // Set up transforms for the four edges. Without transforms an
+        // EdgeEffect draws the TOP edge from (0, 0) to (w, Y * h) where Y
+        // is some factor < 1. For other edges we need to move, rotate, and
+        // flip the effects into proper places.
+        Matrix.setIdentityM(mMatrix, TOP_M);
+        Matrix.setIdentityM(mMatrix, LEFT_M);
+        Matrix.setIdentityM(mMatrix, BOTTOM_M);
+        Matrix.setIdentityM(mMatrix, RIGHT_M);
+
+        Matrix.rotateM(mMatrix, LEFT_M, 90, 0, 0, 1);
+        Matrix.scaleM(mMatrix, LEFT_M, 1, -1, 1);
+
+        Matrix.translateM(mMatrix, BOTTOM_M, 0, h, 0);
+        Matrix.scaleM(mMatrix, BOTTOM_M, 1, -1, 1);
+
+        Matrix.translateM(mMatrix, RIGHT_M, w, 0, 0);
+        Matrix.rotateM(mMatrix, RIGHT_M, 90, 0, 0, 1);
+    }
+
+    @Override
+    protected void render(GLCanvas canvas) {
+        super.render(canvas);
+        boolean more = false;
+        for (int i = 0; i < 4; i++) {
+            canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
+            canvas.multiplyMatrix(mMatrix, i * 16);
+            more |= mEffect[i].draw(canvas);
+            canvas.restore();
+        }
+        if (more) {
+            invalidate();
+        }
+    }
+
+    // Called when the content is pulled away from the edge.
+    // offset is in pixels. direction is one of {TOP, LEFT, BOTTOM, RIGHT}.
+    public void onPull(int offset, int direction) {
+        int fullLength = ((direction & 1) == 0) ? getWidth() : getHeight();
+        mEffect[direction].onPull((float)offset / fullLength);
+        if (!mEffect[direction].isFinished()) {
+            invalidate();
+        }
+    }
+
+    // Call when the object is released after being pulled.
+    public void onRelease() {
+        boolean more = false;
+        for (int i = 0; i < 4; i++) {
+            mEffect[i].onRelease();
+            more |= !mEffect[i].isFinished();
+        }
+        if (more) {
+            invalidate();
+        }
+    }
+
+    // Call when the effect absorbs an impact at the given velocity.
+    // Used when a fling reaches the scroll boundary. velocity is in pixels
+    // per second. direction is one of {TOP, LEFT, BOTTOM, RIGHT}.
+    public void onAbsorb(int velocity, int direction) {
+        mEffect[direction].onAbsorb(velocity);
+        if (!mEffect[direction].isFinished()) {
+            invalidate();
+        }
+    }
+}