Move the drag thing into its own window that goes around on top of everything else.

1 files changed, 186 insertions, 0 deletions

diff --git a/src/com/android/launcher2/DragView.java b/src/com/android/launcher2/DragView.java
new file mode 100644
index 000000000..911a6ce9f
--- /dev/null
+++ b/src/com/android/launcher2/DragView.java
@@ -0,0 +1,186 @@
+/*
+ * 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.launcher2;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.Point;
+import android.os.IBinder;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.KeyEvent;
+import android.view.WindowManager;
+import android.view.WindowManagerImpl;
+
+public class DragView extends View implements TweenCallback {
+    // Number of pixels to add to the dragged item for scaling.  Should be even for pixel alignment.
+    private static final int DRAG_SCALE = 24;
+
+    private Bitmap mBitmap;
+    private Paint mPaint;
+    private int mRegistrationX;
+    private int mRegistrationY;
+
+    SymmetricalLinearTween mTween;
+    private float mScale;
+    private float mAnimationScale = 1.0f;
+
+    private WindowManager.LayoutParams mLayoutParams;
+    private WindowManager mWindowManager;
+
+    /**
+     * Construct the drag view.
+     * <p>
+     * The registration point is the point inside our view that the touch events should
+     * be centered upon.
+     *
+     * @param context A context
+     * @param bitmap The view that we're dragging around.  We scale it up when we draw it.
+     * @param registrationX The x coordinate of the registration point.
+     * @param registrationY The y coordinate of the registration point.
+     */
+    public DragView(Context context, Bitmap bitmap, int registrationX, int registrationY) {
+        super(context);
+
+        mWindowManager = WindowManagerImpl.getDefault();
+        
+        mTween = new SymmetricalLinearTween(false, 110 /*ms duration*/, this);
+
+        int width = bitmap.getWidth();
+        int height = bitmap.getHeight();
+
+        Matrix scale = new Matrix();
+        float scaleFactor = width;
+        scaleFactor = mScale = (scaleFactor + DRAG_SCALE) / scaleFactor;
+        scale.setScale(scaleFactor, scaleFactor);
+
+        mBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, scale, true);
+
+        // The point in our scaled bitmap that the touch events are located
+        mRegistrationX = registrationX + (DRAG_SCALE / 2);
+        mRegistrationY = registrationY + (DRAG_SCALE / 2);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int widthSize = resolveSize(mBitmap.getWidth(), widthMeasureSpec);
+        int heightSize = resolveSize(mBitmap.getHeight(), heightMeasureSpec);
+        setMeasuredDimension(widthSize, heightSize);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (false) {
+            // for debugging
+            Paint p = new Paint();
+            p.setStyle(Paint.Style.FILL);
+            p.setColor(0xaaffffff);
+            canvas.drawRect(0, 0, getWidth(), getHeight(), p);
+        }
+        float scale = mAnimationScale;
+        if (scale < 0.999f) { // allow for some float error
+            float width = mBitmap.getWidth();
+            float offset = (width-(width*scale))/2;
+            canvas.translate(offset, offset);
+            canvas.scale(scale, scale);
+        }
+        canvas.drawBitmap(mBitmap, 0.0f, 0.0f, mPaint);
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mBitmap.recycle();
+    }
+
+    public void onTweenValueChanged(float value, float oldValue) {
+        mAnimationScale = (1.0f+((mScale-1.0f)*value))/mScale;
+        invalidate();
+    }
+
+    public void onTweenStarted() {
+    }
+
+    public void onTweenFinished() {
+    }
+
+    public void setPaint(Paint paint) {
+        mPaint = paint;
+        invalidate();
+    }
+
+    /**
+     * Create a window containing this view and show it.
+     *
+     * @param windowToken obtained from v.getWindowToken() from one of your views
+     * @param touchX the x coordinate the user touched in screen coordinates
+     * @param touchY the y coordinate the user touched in screen coordinates
+     */
+    public void show(IBinder windowToken, int touchX, int touchY) {
+        WindowManager.LayoutParams lp;
+        int pixelFormat;
+
+        pixelFormat = PixelFormat.TRANSLUCENT;
+
+        lp = new WindowManager.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                touchX-mRegistrationX, touchY-mRegistrationY,
+                WindowManager.LayoutParams.TYPE_APPLICATION_SUB_PANEL,
+                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
+                    /*| WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM*/,
+                pixelFormat);
+//        lp.token = mStatusBarView.getWindowToken();
+        lp.gravity = Gravity.LEFT | Gravity.TOP;
+        lp.token = windowToken;
+        lp.setTitle("DragView");
+        mLayoutParams = lp;
+
+        mWindowManager.addView(this, lp);
+
+        mAnimationScale = 1.0f/mScale;
+        mTween.start(true);
+    }
+    
+    /**
+     * Move the window containing this view.
+     *
+     * @param touchX the x coordinate the user touched in screen coordinates
+     * @param touchY the y coordinate the user touched in screen coordinates
+     */
+    void move(int touchX, int touchY) {
+        WindowManager.LayoutParams lp = mLayoutParams;
+        lp.x = touchX - mRegistrationX;
+        lp.y = touchY - mRegistrationY;
+        mWindowManager.updateViewLayout(this, lp);
+    }
+
+    void remove() {
+        mWindowManager.removeView(this);
+    }
+}
+