当试图在RichTextBox中调整图像大小时游标闪烁

/// <summary>
/// The Lower property CreateParams is being used to reduce flicker
/// </summary>
protected override CreateParams CreateParams
        const int WS_EX_COMPOSITED = 0x02000000;
        var cp = base.CreateParams;
        cp.ExStyle |= WS_EX_COMPOSITED;
        return cp;
}

class RichTextBoxEx : RichTextBox
    private const int WM_SETCURSOR = 0x20;
    [System.Runtime.InteropServices.DllImport("user32.dll")]
    private static extern IntPtr SetCursor(IntPtr hCursor);
    protected override void WndProc(ref Message m) {
        if (m.Msg == WM_SETCURSOR) 
            if (SelectionType == RichTextBoxSelectionTypes.Object) 
                // Necessary to avoid recursive calls
                if (Cursor != Cursors.Cross) 
                    Cursor = Cursors.Cross;
                // Necessary to avoid recursive calls
                if (Cursor != Cursors.IBeam) 
                    Cursor = Cursors.IBeam;
            SetCursor(Cursor.Handle);
            return;
        base.WndProc(ref m);
}

public class RichTextBoxEx : RichTextBox
    private const int WM_SETCURSOR = 0x20;
    protected override void WndProc(ref Message m) 
        if (m.Msg == WM_SETCURSOR) 
            if (SelectionType == RichTextBoxSelectionTypes.Object) 
                DefWndProc(ref m);
                return;

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当试图在RichTextBox中调整图像大小时游标闪烁

3 个回答