[英]Mouse double click fires on right clicks only
我想覆蓋面板控件上的雙擊,所以我基本上做到了
HeaderPanel.MouseDoubleClick += (sender, args) =>
{
MaximizeOnClick(sender, args);
};
但是(奇怪的是)只有在我雙擊鼠標右鍵時才會觸發,而在沒有普通鼠標左鍵單擊的情況下永遠不會觸發。 ? 有什么問題?
更新#1:我認為發生這種情況是因為我還重寫了MouseDown
事件,因為當我刪除它時,單擊鼠標左鍵起作用了,所以這兩個事件之間是否存在某種交互作用?
更新#2:
const int WM_NCLBUTTONDOWN = 0xA1;
const int HTCAPTION = 0x2;
const UInt32 WM_NCHITTEST = 0x0084;
const UInt32 WM_MOUSEMOVE = 0x0200;
const UInt32 HTLEFT = 10;
const UInt32 HTRIGHT = 11;
const UInt32 HTBOTTOMRIGHT = 17;
const UInt32 HTBOTTOM = 15;
const UInt32 HTBOTTOMLEFT = 16;
const UInt32 HTTOP = 12;
const UInt32 HTTOPLEFT = 13;
const UInt32 HTTOPRIGHT = 14;
const int RESIZE_HANDLE_SIZE = 10;
[DllImport("User32.dll")]
public static extern bool ReleaseCapture();
[DllImport("User32.dll")]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
protected override void WndProc(ref Message m)
{
bool handled = false;
if (m.Msg == WM_NCHITTEST || m.Msg == WM_MOUSEMOVE)
{
Size formSize = Size;
Point screenPoint = new Point(m.LParam.ToInt32());
Point clientPoint = PointToClient(screenPoint);
Dictionary<UInt32, Rectangle> boxes = new Dictionary<UInt32, Rectangle>
{
{HTBOTTOMLEFT, new Rectangle(0, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTBOTTOM, new Rectangle(RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTBOTTOMRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE)},
{HTTOPRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTTOP, new Rectangle(RESIZE_HANDLE_SIZE, 0, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTTOPLEFT, new Rectangle(0, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
{HTLEFT, new Rectangle(0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE)}
};
foreach (KeyValuePair<UInt32, Rectangle> hitBox in boxes)
{
if (hitBox.Value.Contains(clientPoint))
{
m.Result = (IntPtr)hitBox.Key;
handled = true;
break;
}
}
}
if (!handled)
base.WndProc(ref m);
}
private void HeaderPanelOnMouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
}
}
private void MaximizeOnClick(object sender, EventArgs eventArgs)
{
if (FormWindowState.Normal == WindowState)
{
MaximumSize = Screen.PrimaryScreen.WorkingArea.Size;
WindowState = FormWindowState.Maximized;
}
else
{
MaximumSize = new Size(0, 0);
WindowState = FormWindowState.Normal;
}
Panel.Select();
}
好的,我已經通過在鼠標按下之前處理雙擊事件來解決了該問題……基本上可以更改此問題
private void HeaderPanelOnMouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left) {
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
}
}
對此
private void HeaderPanelOnMouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && e.Clicks >= 2) {
MaximizeOnClick(sender, e);
return;
}
if (e.Button != MouseButtons.Left) {
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
}
}
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