523add43be
------ #### ryControls V2.1.2101.1201 - *.[更新]内置的ObjectListView从1.13更新到2.9.1版本,并对主要属性进行汉化。 - *.[修复]修复新版ObjectListView选中项有筛选结果时,筛选结果白色字体看不清的BUG。 - *.[改进]TextBoxEx2默认事件改为TextChanged2。
220 lines
8.2 KiB
C#
220 lines
8.2 KiB
C#
/*
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* DragSource.cs - Add drag source functionality to an ObjectListView
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*
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* Author: Phillip Piper
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* Date: 2009-03-17 5:15 PM
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*
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* Change log:
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* 2011-03-29 JPP - Separate OLVDataObject.cs
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* v2.3
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* 2009-07-06 JPP - Make sure Link is acceptable as an drop effect by default
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* (since MS didn't make it part of the 'All' value)
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* v2.2
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* 2009-04-15 JPP - Separated DragSource.cs into DropSink.cs
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* 2009-03-17 JPP - Initial version
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*
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* Copyright (C) 2009-2014 Phillip Piper
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* If you wish to use this code in a closed source application, please contact phillip.piper@gmail.com.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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namespace BrightIdeasSoftware
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{
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/// <summary>
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/// An IDragSource controls how drag out from the ObjectListView will behave
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/// </summary>
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public interface IDragSource
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{
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/// <summary>
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/// A drag operation is beginning. Return the data object that will be used
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/// for data transfer. Return null to prevent the drag from starting. The data
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/// object will normally include all the selected objects.
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/// </summary>
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/// <remarks>
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/// The returned object is later passed to the GetAllowedEffect() and EndDrag()
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/// methods.
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/// </remarks>
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/// <param name="olv">What ObjectListView is being dragged from.</param>
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/// <param name="button">Which mouse button is down?</param>
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/// <param name="item">What item was directly dragged by the user? There may be more than just this
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/// item selected.</param>
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/// <returns>The data object that will be used for data transfer. This will often be a subclass
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/// of DataObject, but does not need to be.</returns>
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Object StartDrag(ObjectListView olv, MouseButtons button, OLVListItem item);
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/// <summary>
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/// What operations are possible for this drag? This controls the icon shown during the drag
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/// </summary>
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/// <param name="dragObject">The data object returned by StartDrag()</param>
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/// <returns>A combination of DragDropEffects flags</returns>
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DragDropEffects GetAllowedEffects(Object dragObject);
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/// <summary>
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/// The drag operation is complete. Do whatever is necessary to complete the action.
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/// </summary>
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/// <param name="dragObject">The data object returned by StartDrag()</param>
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/// <param name="effect">The value returned from GetAllowedEffects()</param>
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void EndDrag(Object dragObject, DragDropEffects effect);
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}
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/// <summary>
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/// A do-nothing implementation of IDragSource that can be safely subclassed.
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/// </summary>
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public class AbstractDragSource : IDragSource
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{
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#region IDragSource Members
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/// <summary>
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/// See IDragSource documentation
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/// </summary>
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/// <param name="olv"></param>
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/// <param name="button"></param>
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/// <param name="item"></param>
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/// <returns></returns>
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public virtual Object StartDrag(ObjectListView olv, MouseButtons button, OLVListItem item) {
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return null;
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}
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/// <summary>
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/// See IDragSource documentation
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/// </summary>
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/// <param name="data"></param>
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/// <returns></returns>
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public virtual DragDropEffects GetAllowedEffects(Object data) {
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return DragDropEffects.None;
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}
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/// <summary>
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/// See IDragSource documentation
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/// </summary>
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/// <param name="dragObject"></param>
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/// <param name="effect"></param>
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public virtual void EndDrag(Object dragObject, DragDropEffects effect) {
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}
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#endregion
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}
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/// <summary>
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/// A reasonable implementation of IDragSource that provides normal
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/// drag source functionality. It creates a data object that supports
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/// inter-application dragging of text and HTML representation of
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/// the dragged rows. It can optionally force a refresh of all dragged
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/// rows when the drag is complete.
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/// </summary>
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/// <remarks>Subclasses can override GetDataObject() to add new
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/// data formats to the data transfer object.</remarks>
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public class SimpleDragSource : IDragSource
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{
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#region Constructors
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/// <summary>
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/// Construct a SimpleDragSource
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/// </summary>
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public SimpleDragSource() {
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}
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/// <summary>
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/// Construct a SimpleDragSource that refreshes the dragged rows when
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/// the drag is complete
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/// </summary>
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/// <param name="refreshAfterDrop"></param>
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public SimpleDragSource(bool refreshAfterDrop) {
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this.RefreshAfterDrop = refreshAfterDrop;
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}
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#endregion
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#region Public properties
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/// <summary>
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/// Gets or sets whether the dragged rows should be refreshed when the
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/// drag operation is complete.
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/// </summary>
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public bool RefreshAfterDrop {
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get { return refreshAfterDrop; }
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set { refreshAfterDrop = value; }
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}
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private bool refreshAfterDrop;
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#endregion
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#region IDragSource Members
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/// <summary>
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/// Create a DataObject when the user does a left mouse drag operation.
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/// See IDragSource for further information.
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/// </summary>
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/// <param name="olv"></param>
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/// <param name="button"></param>
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/// <param name="item"></param>
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/// <returns></returns>
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public virtual Object StartDrag(ObjectListView olv, MouseButtons button, OLVListItem item) {
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// We only drag on left mouse
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if (button != MouseButtons.Left)
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return null;
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return this.CreateDataObject(olv);
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}
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/// <summary>
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/// Which operations are allowed in the operation? By default, all operations are supported.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>All opertions are supported</returns>
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public virtual DragDropEffects GetAllowedEffects(Object data) {
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return DragDropEffects.All | DragDropEffects.Link; // why didn't MS include 'Link' in 'All'??
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}
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/// <summary>
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/// The drag operation is finished. Refreshe the dragged rows if so configured.
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/// </summary>
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/// <param name="dragObject"></param>
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/// <param name="effect"></param>
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public virtual void EndDrag(Object dragObject, DragDropEffects effect) {
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OLVDataObject data = dragObject as OLVDataObject;
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if (data == null)
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return;
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if (this.RefreshAfterDrop)
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data.ListView.RefreshObjects(data.ModelObjects);
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}
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/// <summary>
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/// Create a data object that will be used to as the data object
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/// for the drag operation.
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/// </summary>
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/// <remarks>
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/// Subclasses can override this method add new formats to the data object.
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/// </remarks>
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/// <param name="olv">The ObjectListView that is the source of the drag</param>
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/// <returns>A data object for the drag</returns>
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protected virtual object CreateDataObject(ObjectListView olv) {
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return new OLVDataObject(olv);
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}
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#endregion
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}
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}
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