delphi拖放编程（2）.htm

在天极网上发布的各类delphi原码及技巧文档

<p>　　…</p>
<p>　　则移动、拷贝操作将限制在本子窗口范围内。</p>
<p>　　当解决了上述问我们的工作就只是遵循拖放的一般开发步骤，按步就班来完成了。</p>
<p>　　1.FileList开始拖动操作</p>
<blockquote>
 <p>procedure TFMForm.FileListMouseDown(Sender: TObject; Button: TMouseButton; 
 </p>
 <p>Shift: TShiftState; X, Y: Integer); </p>
 <p>begin </p>
 <p>if Button = mbLeft then </p>
 <p>with Sender as TFileListBox do </p>
 <p>begin </p>
 <p>if ItemAtPos(Point(X, Y), True) &#62;= 0 then </p>
 <p>BeginDrag(False); </p>
 <p>end; </p>
 <p>end; </p>
</blockquote>
<p>　　ItemAtPos用来检查当前是否有文件存在。而BeginDrag方法传递参数False,允许FileList单独处理鼠标事件而并不开始拖动。事实上这种情况是大量存在的。</p>
<p>　　</p>
<p>　　2.DirectoryOutline、DriveTabSet决定是否能接受拖动的就地放下。</p>
<blockquote>
 <p><br>
 procedure TFMForm.DirectoryOutlineDragOver(Sender, Source: TObject; X, </p>
 <p>Y: Integer; State: TDragState; var Accept: Boolean); </p>
 <p>begin </p>
 <p>if Source is TFileListBox then </p>
 <p>Accept := True; </p>
 <p>end; </p>
 <p> </p>
 <p>procedure TFMForm.DriveTabSetDragOver(Sender, Source: TObject; X, </p>
 <p>Y: Integer; State: TDragState; var Accept: Boolean); </p>
 <p>var </p>
 <p>PropPos: Integer; </p>
 <p>begin </p>
 <p>if Source is TFileListBox then </p>
 <p>with DriveTabSet do </p>
 <p>begin </p>
 <p>PropPos := ItemAtPos(Point(X,Y)); </p>
 <p>Accept := (PropPos &#62; -1) and (PropPos &#60; Tabs.Count); </p>
 <p>end; </p>
 <p>end; </p>
</blockquote>
<p></p>
<p>　　DirectoryOutline是无条件的接受，而DriveTabSet需检查是否是合法的标签。</p>
<p>　　</p>
<p>　　3.拖动放下的响应</p>
<p>　　DirectoryOutline的拖动放下用于实现文件移动功能。程序中调用ConfirmChange 事件处理过程，目标路径由DirctoryOutline.Items[GetItem(X,Y)].FullPath来得到。</p>
<blockquote>
 <p><br>
 procedure TFMForm.DirectoryOutlineDragDrop(Sender, Source: TObject; X, </p>
 <p>Y: Integer); </p>
 <p>begin </p>
 <p>if Source is TFileListBox then </p>
 <p>with DirectoryOutline do </p>
 <p>begin </p>
 <p>ConfirmChange('Move',FileList.FileName, Items[GetItem(X, Y)].FullPath); </p>
 <p>end; </p>
 <p>end; </p>
 <p>　　DriveTabSet的拖动放下用于实现文件拷贝功能。程序中把当前位置转化为相应的驱动器号，目标路径由CurrentDirList[DriveTabSet.TabIndex]获得。</p>
 <p>procedure TFMForm.DriveTabSetDragDrop(Sender, Source: TObject; X,Y: Integer); 
 </p>
 <p>var </p>
 <p>APoint: TPoint; </p>
 <p>begin </p>
 <p>APoint.X := X; APoint.Y := Y; </p>
 <p>DriveTabSet.TabIndex := DriveTabSet.ItemAtPos(APoint); </p>
 <p>if Source is TFileListBox then </p>
 <p>with DriveTabSet do </p>
 <p>begin </p>
 <p>if CurrentDirList[TabIndex] &#60;&#62; '' then </p>
 <p>ConfirmChange('Copy',TheFilename,CurrentDirList[TabIndex]); </p>
 <p>end; </p>
 <p>end; </p>
</blockquote>
<p></p>
<p>　　4.FileList响应拖动结束，更新文件列表</p>
<blockquote>
 <p>procedure TFMForm.FileListEndDrag(Sender, Target: TObject; X, Y: Integer); 
 </p>
 <p>begin </p>
 <p>if Target &#60;&#62; nil then FileList.Update; </p>
 <p>end; </p>
</blockquote>
<p></p>
<p></p>
<p>　　到目前为止，我们的文件管理器功能已足够强大。不过还有许多问题值得读者去进一步探讨，如：</p>
<p>　　1.文件与应用程序关联的建立；</p>
<p>　　2.在文件列表框中显示更多的文件信息；</p>
<p>　　3.文件列表框中的文件按后缀各排序等。</p>
<p>　　文件管理器是一个真正的综合例程，对它的钻研会使您更进一步模到Delphi编程的精髓。</p>

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