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329 lines
11 KiB
329 lines
11 KiB
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*/
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package java.awt.dnd;
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import java.awt.event.InputEvent;
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/**
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* The <code>DragSourceDragEvent</code> is
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* delivered from the <code>DragSourceContextPeer</code>,
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* via the <code>DragSourceContext</code>, to the <code>DragSourceListener</code>
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* registered with that <code>DragSourceContext</code> and with its associated
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* <code>DragSource</code>.
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* <p>
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* The <code>DragSourceDragEvent</code> reports the <i>target drop action</i>
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* and the <i>user drop action</i> that reflect the current state of
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* the drag operation.
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* <p>
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* <i>Target drop action</i> is one of <code>DnDConstants</code> that represents
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* the drop action selected by the current drop target if this drop action is
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* supported by the drag source or <code>DnDConstants.ACTION_NONE</code> if this
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* drop action is not supported by the drag source.
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* <p>
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* <i>User drop action</i> depends on the drop actions supported by the drag
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* source and the drop action selected by the user. The user can select a drop
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* action by pressing modifier keys during the drag operation:
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* <pre>
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* Ctrl + Shift -> ACTION_LINK
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* Ctrl -> ACTION_COPY
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* Shift -> ACTION_MOVE
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* </pre>
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* If the user selects a drop action, the <i>user drop action</i> is one of
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* <code>DnDConstants</code> that represents the selected drop action if this
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* drop action is supported by the drag source or
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* <code>DnDConstants.ACTION_NONE</code> if this drop action is not supported
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* by the drag source.
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* <p>
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* If the user doesn't select a drop action, the set of
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* <code>DnDConstants</code> that represents the set of drop actions supported
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* by the drag source is searched for <code>DnDConstants.ACTION_MOVE</code>,
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* then for <code>DnDConstants.ACTION_COPY</code>, then for
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* <code>DnDConstants.ACTION_LINK</code> and the <i>user drop action</i> is the
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* first constant found. If no constant is found the <i>user drop action</i>
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* is <code>DnDConstants.ACTION_NONE</code>.
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*
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* @since 1.2
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*
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*/
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public class DragSourceDragEvent extends DragSourceEvent {
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private static final long serialVersionUID = 481346297933902471L;
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/**
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* Constructs a <code>DragSourceDragEvent</code>.
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* This class is typically
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* instantiated by the <code>DragSourceContextPeer</code>
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* rather than directly
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* by client code.
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* The coordinates for this <code>DragSourceDragEvent</code>
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* are not specified, so <code>getLocation</code> will return
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* <code>null</code> for this event.
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* <p>
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* The arguments <code>dropAction</code> and <code>action</code> should
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* be one of <code>DnDConstants</code> that represents a single action.
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* The argument <code>modifiers</code> should be either a bitwise mask
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* of old <code>java.awt.event.InputEvent.*_MASK</code> constants or a
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* bitwise mask of extended <code>java.awt.event.InputEvent.*_DOWN_MASK</code>
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* constants.
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* This constructor does not throw any exception for invalid <code>dropAction</code>,
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* <code>action</code> and <code>modifiers</code>.
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*
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* @param dsc the <code>DragSourceContext</code> that is to manage
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* notifications for this event.
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* @param dropAction the user drop action.
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* @param action the target drop action.
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* @param modifiers the modifier keys down during event (shift, ctrl,
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* alt, meta)
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* Either extended _DOWN_MASK or old _MASK modifiers
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* should be used, but both models should not be mixed
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* in one event. Use of the extended modifiers is
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* preferred.
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*
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* @throws IllegalArgumentException if <code>dsc</code> is <code>null</code>.
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*
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* @see java.awt.event.InputEvent
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* @see DragSourceEvent#getLocation
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*/
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public DragSourceDragEvent(DragSourceContext dsc, int dropAction,
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int action, int modifiers) {
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super(dsc);
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targetActions = action;
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gestureModifiers = modifiers;
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this.dropAction = dropAction;
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if ((modifiers & ~(JDK_1_3_MODIFIERS | JDK_1_4_MODIFIERS)) != 0) {
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invalidModifiers = true;
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} else if ((getGestureModifiers() != 0) && (getGestureModifiersEx() == 0)) {
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setNewModifiers();
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} else if ((getGestureModifiers() == 0) && (getGestureModifiersEx() != 0)) {
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setOldModifiers();
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} else {
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invalidModifiers = true;
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}
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}
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/**
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* Constructs a <code>DragSourceDragEvent</code> given the specified
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* <code>DragSourceContext</code>, user drop action, target drop action,
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* modifiers and coordinates.
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* <p>
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* The arguments <code>dropAction</code> and <code>action</code> should
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* be one of <code>DnDConstants</code> that represents a single action.
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* The argument <code>modifiers</code> should be either a bitwise mask
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* of old <code>java.awt.event.InputEvent.*_MASK</code> constants or a
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* bitwise mask of extended <code>java.awt.event.InputEvent.*_DOWN_MASK</code>
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* constants.
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* This constructor does not throw any exception for invalid <code>dropAction</code>,
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* <code>action</code> and <code>modifiers</code>.
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*
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* @param dsc the <code>DragSourceContext</code> associated with this
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* event.
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* @param dropAction the user drop action.
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* @param action the target drop action.
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* @param modifiers the modifier keys down during event (shift, ctrl,
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* alt, meta)
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* Either extended _DOWN_MASK or old _MASK modifiers
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* should be used, but both models should not be mixed
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* in one event. Use of the extended modifiers is
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* preferred.
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* @param x the horizontal coordinate for the cursor location
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* @param y the vertical coordinate for the cursor location
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*
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* @throws IllegalArgumentException if <code>dsc</code> is <code>null</code>.
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*
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* @see java.awt.event.InputEvent
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* @since 1.4
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*/
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public DragSourceDragEvent(DragSourceContext dsc, int dropAction,
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int action, int modifiers, int x, int y) {
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super(dsc, x, y);
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targetActions = action;
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gestureModifiers = modifiers;
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this.dropAction = dropAction;
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if ((modifiers & ~(JDK_1_3_MODIFIERS | JDK_1_4_MODIFIERS)) != 0) {
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invalidModifiers = true;
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} else if ((getGestureModifiers() != 0) && (getGestureModifiersEx() == 0)) {
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setNewModifiers();
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} else if ((getGestureModifiers() == 0) && (getGestureModifiersEx() != 0)) {
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setOldModifiers();
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} else {
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invalidModifiers = true;
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}
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}
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/**
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* This method returns the target drop action.
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*
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* @return the target drop action.
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*/
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public int getTargetActions() {
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return targetActions;
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}
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private static final int JDK_1_3_MODIFIERS = InputEvent.SHIFT_DOWN_MASK - 1;
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private static final int JDK_1_4_MODIFIERS =
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((InputEvent.ALT_GRAPH_DOWN_MASK << 1) - 1) & ~JDK_1_3_MODIFIERS;
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/**
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* This method returns an <code>int</code> representing
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* the current state of the input device modifiers
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* associated with the user's gesture. Typically these
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* would be mouse buttons or keyboard modifiers.
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* <P>
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* If the <code>modifiers</code> passed to the constructor
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* are invalid, this method returns them unchanged.
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*
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* @return the current state of the input device modifiers
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*/
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public int getGestureModifiers() {
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return invalidModifiers ? gestureModifiers : gestureModifiers & JDK_1_3_MODIFIERS;
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}
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/**
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* This method returns an <code>int</code> representing
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* the current state of the input device extended modifiers
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* associated with the user's gesture.
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* See {@link InputEvent#getModifiersEx}
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* <P>
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* If the <code>modifiers</code> passed to the constructor
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* are invalid, this method returns them unchanged.
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*
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* @return the current state of the input device extended modifiers
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* @since 1.4
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*/
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public int getGestureModifiersEx() {
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return invalidModifiers ? gestureModifiers : gestureModifiers & JDK_1_4_MODIFIERS;
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}
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/**
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* This method returns the user drop action.
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*
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* @return the user drop action.
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*/
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public int getUserAction() { return dropAction; }
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/**
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* This method returns the logical intersection of
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* the target drop action and the set of drop actions supported by
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* the drag source.
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*
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* @return the logical intersection of the target drop action and
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* the set of drop actions supported by the drag source.
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*/
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public int getDropAction() {
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return targetActions & getDragSourceContext().getSourceActions();
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}
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/*
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* fields
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*/
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/**
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* The target drop action.
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*
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* @serial
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*/
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private int targetActions = DnDConstants.ACTION_NONE;
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/**
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* The user drop action.
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*
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* @serial
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*/
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private int dropAction = DnDConstants.ACTION_NONE;
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/**
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* The state of the input device modifiers associated with the user
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* gesture.
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*
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* @serial
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*/
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private int gestureModifiers = 0;
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/**
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* Indicates whether the <code>gestureModifiers</code> are invalid.
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*
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* @serial
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*/
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private boolean invalidModifiers;
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/**
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* Sets new modifiers by the old ones.
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* The mouse modifiers have higher priority than overlaying key
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* modifiers.
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*/
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private void setNewModifiers() {
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if ((gestureModifiers & InputEvent.BUTTON1_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON1_DOWN_MASK;
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}
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if ((gestureModifiers & InputEvent.BUTTON2_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON2_DOWN_MASK;
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}
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if ((gestureModifiers & InputEvent.BUTTON3_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON3_DOWN_MASK;
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}
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if ((gestureModifiers & InputEvent.SHIFT_MASK) != 0) {
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gestureModifiers |= InputEvent.SHIFT_DOWN_MASK;
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}
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if ((gestureModifiers & InputEvent.CTRL_MASK) != 0) {
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gestureModifiers |= InputEvent.CTRL_DOWN_MASK;
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}
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if ((gestureModifiers & InputEvent.ALT_GRAPH_MASK) != 0) {
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gestureModifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
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}
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}
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/**
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* Sets old modifiers by the new ones.
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*/
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private void setOldModifiers() {
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if ((gestureModifiers & InputEvent.BUTTON1_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON1_MASK;
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}
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if ((gestureModifiers & InputEvent.BUTTON2_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON2_MASK;
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}
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if ((gestureModifiers & InputEvent.BUTTON3_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.BUTTON3_MASK;
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}
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if ((gestureModifiers & InputEvent.SHIFT_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.SHIFT_MASK;
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}
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if ((gestureModifiers & InputEvent.CTRL_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.CTRL_MASK;
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}
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if ((gestureModifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) {
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gestureModifiers |= InputEvent.ALT_GRAPH_MASK;
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}
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}
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}
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