1 files changed, 195 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/ControlPoint.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/ControlPoint.java
new file mode 100644
index 000000000..55930f6cd
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/ControlPoint.java
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
+ *
+ * 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.ide.eclipse.adt.internal.editors.layout.gle2;
+
+import org.eclipse.swt.dnd.DragSourceEvent;
+import org.eclipse.swt.dnd.DragSourceListener;
+import org.eclipse.swt.dnd.DropTargetEvent;
+import org.eclipse.swt.events.MenuDetectEvent;
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.graphics.Point;
+
+/**
+ * A {@link ControlPoint} is a coordinate in the canvas control which corresponds
+ * exactly to (0,0) at the top left of the canvas. It is unaffected by canvas
+ * zooming.
+ */
+public final class ControlPoint {
+    /** Containing canvas which the point is relative to. */
+    private final LayoutCanvas mCanvas;
+
+    /** The X coordinate of the mouse coordinate. */
+    public final int x;
+
+    /** The Y coordinate of the mouse coordinate. */
+    public final int y;
+
+    /**
+     * Constructs a new {@link ControlPoint} from the given event. The event
+     * must be from a {@link MouseListener} associated with the
+     * {@link LayoutCanvas} such that the {@link MouseEvent#x} and
+     * {@link MouseEvent#y} fields are relative to the canvas.
+     *
+     * @param canvas The {@link LayoutCanvas} this point is within.
+     * @param event The mouse event to construct the {@link ControlPoint}
+     *            from.
+     * @return A {@link ControlPoint} which corresponds to the given
+     *         {@link MouseEvent}.
+     */
+    public static ControlPoint create(LayoutCanvas canvas, MouseEvent event) {
+        // The mouse event coordinates should already be relative to the canvas
+        // widget.
+        assert event.widget == canvas : event.widget;
+        return new ControlPoint(canvas, event.x, event.y);
+    }
+
+    /**
+     * Constructs a new {@link ControlPoint} from the given menu detect event.
+     *
+     * @param canvas The {@link LayoutCanvas} this point is within.
+     * @param event The menu detect event to construct the {@link ControlPoint} from.
+     * @return A {@link ControlPoint} which corresponds to the given
+     *         {@link MenuDetectEvent}.
+     */
+    public static ControlPoint create(LayoutCanvas canvas, MenuDetectEvent event) {
+        // The menu detect events are always display-relative.
+        org.eclipse.swt.graphics.Point p = canvas.toControl(event.x, event.y);
+        return new ControlPoint(canvas, p.x, p.y);
+    }
+
+    /**
+     * Constructs a new {@link ControlPoint} from the given event. The event
+     * must be from a {@link DragSourceListener} associated with the
+     * {@link LayoutCanvas} such that the {@link DragSourceEvent#x} and
+     * {@link DragSourceEvent#y} fields are relative to the canvas.
+     *
+     * @param canvas The {@link LayoutCanvas} this point is within.
+     * @param event The mouse event to construct the {@link ControlPoint}
+     *            from.
+     * @return A {@link ControlPoint} which corresponds to the given
+     *         {@link DragSourceEvent}.
+     */
+    public static ControlPoint create(LayoutCanvas canvas, DragSourceEvent event) {
+        // The drag source event coordinates should already be relative to the
+        // canvas widget.
+        return new ControlPoint(canvas, event.x, event.y);
+    }
+
+    /**
+     * Constructs a new {@link ControlPoint} from the given event.
+     *
+     * @param canvas The {@link LayoutCanvas} this point is within.
+     * @param event The mouse event to construct the {@link ControlPoint}
+     *            from.
+     * @return A {@link ControlPoint} which corresponds to the given
+     *         {@link DropTargetEvent}.
+     */
+    public static ControlPoint create(LayoutCanvas canvas, DropTargetEvent event) {
+        // The drop target events are always relative to the display, so we must
+        // first convert them to be canvas relative.
+        org.eclipse.swt.graphics.Point p = canvas.toControl(event.x, event.y);
+        return new ControlPoint(canvas, p.x, p.y);
+    }
+
+    /**
+     * Constructs a new {@link ControlPoint} from the given x,y coordinates,
+     * which must be relative to the given {@link LayoutCanvas}.
+     *
+     * @param canvas The {@link LayoutCanvas} this point is within.
+     * @param x The mouse event x coordinate relative to the canvas
+     * @param y The mouse event x coordinate relative to the canvas
+     * @return A {@link ControlPoint} which corresponds to the given
+     *         coordinates.
+     */
+    public static ControlPoint create(LayoutCanvas canvas, int x, int y) {
+        return new ControlPoint(canvas, x, y);
+    }
+
+    /**
+     * Constructs a new canvas control coordinate with the given X and Y
+     * coordinates. This is private; use one of the factory methods
+     * {@link #create(LayoutCanvas, MouseEvent)},
+     * {@link #create(LayoutCanvas, DragSourceEvent)} or
+     * {@link #create(LayoutCanvas, DropTargetEvent)} instead.
+     *
+     * @param canvas The canvas which contains this coordinate
+     * @param x The mouse x coordinate
+     * @param y The mouse y coordinate
+     */
+    private ControlPoint(LayoutCanvas canvas, int x, int y) {
+        mCanvas = canvas;
+        this.x = x;
+        this.y = y;
+    }
+
+    /**
+     * Returns the equivalent {@link LayoutPoint} to this
+     * {@link ControlPoint}.
+     *
+     * @return The equivalent {@link LayoutPoint} to this
+     *         {@link ControlPoint}.
+     */
+    public LayoutPoint toLayout() {
+        int lx = mCanvas.getHorizontalTransform().inverseTranslate(x);
+        int ly = mCanvas.getVerticalTransform().inverseTranslate(y);
+
+        return LayoutPoint.create(mCanvas, lx, ly);
+    }
+
+    @Override
+    public String toString() {
+        return "ControlPoint [x=" + x + ", y=" + y + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + x;
+        result = prime * result + y;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        ControlPoint other = (ControlPoint) obj;
+        if (x != other.x)
+            return false;
+        if (y != other.y)
+            return false;
+        if (mCanvas != other.mCanvas) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Returns this point as an SWT point in the display coordinate system
+     *
+     * @return this point as an SWT point in the display coordinate system
+     */
+    public Point toDisplayPoint() {
+        return mCanvas.toDisplay(x, y);
+    }
+}