Added Android code

[wl-app.git] / Android / webViewMarker / src / main / java / com / blahti / drag / DragView.java

diff --git a/Android/webViewMarker/src/main/java/com/blahti/drag/DragView.java b/Android/webViewMarker/src/main/java/com/blahti/drag/DragView.java
new file mode 100755 (executable)
index 0000000..ad1de4c
--- /dev/null
+++ b/Android/webViewMarker/src/main/java/com/blahti/drag/DragView.java
@@ -0,0 +1,123 @@
+/*
+ * This is a modified version of a class from the Android Open Source Project. 
+ * The original copyright and license information follows.
+ * 
+ * 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.blahti.drag;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.os.IBinder;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+
+/**
+ * A DragView is a special view used by a DragController. During a drag operation, what is actually moving
+ * on the screen is a DragView. A DragView is constructed using a bitmap of the view the user really
+ * wants to move.
+ *
+ */
+
+public class DragView extends View {
+    private static final boolean DEBUG = false;
+    private static final int PADDING_TO_SCALE = 0;
+    private final int mRegistrationX;
+    private final int mRegistrationY;
+    private Bitmap mBitmap;
+    private Paint mDebugPaint = new Paint();
+    private WindowManager.LayoutParams mLayoutParams;
+    private WindowManager mWindowManager;
+
+    public DragView(Context context) throws Exception {
+        super(context);
+        mRegistrationX = 0;
+        mRegistrationY = 0;
+        throw new Exception("DragView constructor permits only programatical calling");
+    }
+
+    /**
+     * 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, int left, int top, int width, int height) {
+        super(context);
+        mWindowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);        
+        mRegistrationX = registrationX + (PADDING_TO_SCALE / 2);
+        mRegistrationY = registrationY + (PADDING_TO_SCALE / 2);
+        final float scaleFactor = ((float)width + PADDING_TO_SCALE) / (float)width;
+        final Matrix scale = new Matrix();
+        scale.setScale(scaleFactor, scaleFactor);
+        mBitmap = Bitmap.createBitmap(bitmap, left, top, width, height, scale, true);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        setMeasuredDimension(mBitmap.getWidth(), mBitmap.getHeight());
+    }
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (DEBUG) {
+            mDebugPaint.setStyle(Paint.Style.FILL);
+            mDebugPaint.setColor(0x88dd0011);
+            canvas.drawRect(0, 0, getWidth(), getHeight(), mDebugPaint);
+        }
+        canvas.drawBitmap(mBitmap, 0.0f, 0.0f, null);
+    }
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mBitmap.recycle();
+    }
+
+    void show(IBinder windowToken, int touchX, int touchY) {
+        final WindowManager.LayoutParams 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,
+            PixelFormat.TRANSLUCENT
+        );
+        lp.gravity = Gravity.LEFT | Gravity.TOP;
+        lp.token = windowToken;
+        lp.setTitle("DragView");
+        mLayoutParams = lp;
+        mWindowManager.addView(this, lp);
+    }
+    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);
+    }
+}