84 lines
2.5 KiB
C#
84 lines
2.5 KiB
C#
//
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// System.Windows.Forms.Design.ScrollableControlDesigner
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//
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// Authors:
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// Ivan N. Zlatev (contact i-nZ.net)
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//
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// (C) 2006-2007 Ivan N. Zlatev
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel;
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using System.ComponentModel.Design;
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using System.Windows.Forms;
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using System.Drawing;
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using System.Drawing.Design;
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using System.Collections;
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namespace System.Windows.Forms.Design
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{
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public class ScrollableControlDesigner : ParentControlDesigner
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{
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public ScrollableControlDesigner ()
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{
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}
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private const int HTHSCROLL = 6;
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private const int HTVSCROLL = 7;
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protected override bool GetHitTest (Point pt)
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{
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if (base.GetHitTest (pt)) {
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return true;
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}
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// Check if the user has clicked on the scroll bars and forward the message to
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// the ScrollableControl. (Don't filter out the scrolling.). Keep in mind that scrollbars
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// will be shown only if ScrollableControl.AutoScroll = true
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//
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if (this.Control is ScrollableControl && ((ScrollableControl)Control).AutoScroll) {
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int hitTestResult = (int) Native.SendMessage (this.Control.Handle,
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Native.Msg.WM_NCHITTEST,
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IntPtr.Zero,
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(IntPtr) Native.LParam (pt.X, pt.Y));
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if (hitTestResult == HTHSCROLL || hitTestResult == HTVSCROLL)
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return true;
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}
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return false;
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}
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protected override void WndProc (ref Message m)
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{
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base.WndProc (ref m);
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if (m.Msg == (int)Native.Msg.WM_HSCROLL || m.Msg == (int)Native.Msg.WM_VSCROLL)
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this.DefWndProc (ref m);
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}
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}
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}
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