100 lines
2.9 KiB
C#
100 lines
2.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace Mesen.GUI.Controls
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{
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//Code adapted from:
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//http://blogs.msdn.com/b/hippietim/archive/2006/03/27/562256.aspx
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class MyListView : ListView
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{
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private bool m_doubleClickDoesCheck = true; // maintain the default behavior
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private bool m_inDoubleClickCheckHack = false;
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//****************************************************************************************
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// This function helps us overcome the problem with the managed listview wrapper wanting
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// to turn double-clicks on checklist items into checkbox clicks. We count on the fact
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// that the base handler for NM_DBLCLK will send a hit test request back at us right away.
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// So we set a special flag to return a bogus hit test result in that case.
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//****************************************************************************************
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private void OnWmReflectNotify(ref Message m)
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{
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if(!DoubleClickDoesCheck && CheckBoxes) {
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NativeMethods.NMHDR nmhdr = (NativeMethods.NMHDR)Marshal.PtrToStructure(m.LParam, typeof(NativeMethods.NMHDR));
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if(nmhdr.code == NativeMethods.NM_DBLCLK) {
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m_inDoubleClickCheckHack = true;
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}
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}
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}
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protected override void WndProc(ref Message m)
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{
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switch(m.Msg) {
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// This code is to hack around the fact that the managed listview
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// wrapper translates double clicks into checks without giving the
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// host to participate.
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// See OnWmReflectNotify() for more details.
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case NativeMethods.WM_REFLECT + NativeMethods.WM_NOTIFY:
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OnWmReflectNotify(ref m);
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break;
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// This code checks to see if we have entered our hack check for
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// double clicking items in check lists. During the NM_DBLCLK
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// processing, the managed handler will send a hit test message
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// to see which item to check. Returning -1 will convince that
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// code not to proceed.
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case NativeMethods.LVM_HITTEST:
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if(m_inDoubleClickCheckHack) {
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m_inDoubleClickCheckHack = false;
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m.Result = (System.IntPtr)(-1);
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return;
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}
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break;
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}
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base.WndProc(ref m);
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}
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[Browsable(true),
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Description("When CheckBoxes is true, this controls whether or not double clicking will toggle the check."),
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Category("My Controls"),
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DefaultValue(true)]
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public bool DoubleClickDoesCheck
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{
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get
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{
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return m_doubleClickDoesCheck;
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}
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set
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{
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m_doubleClickDoesCheck = value;
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}
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}
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}
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public class NativeMethods
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{
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public const int WM_USER = 0x0400;
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public const int WM_REFLECT = WM_USER + 0x1C00;
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public const int WM_NOTIFY = 0x004E;
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public const int LVM_HITTEST = (0x1000 + 18);
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public const int NM_DBLCLK = (-3);
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[StructLayout(LayoutKind.Sequential)]
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public struct NMHDR
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{
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public IntPtr hwndFrom;
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public UIntPtr idFrom;
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public int code;
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}
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}
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}
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