如何借鉴一个Te​​xtBox的顶部 [英] How to draw on top of a TextBox

问题描述

我有一个文本框的winform，我想画在它上面的一些GDI图形。文本框不具有涂料（）事件挂钩，所以我认为这一切已窗体的Paint事件中happeen。作为一个测试，我绘制一条从原点的矩形的位置在文本框中有：

I have winform with a TextBox and I want to draw some GDI graphics on top of it. The text box does not have a Paint() event to hook to, so I assume it all has to happeen within the form's Paint event. As a test I am drawing a rectangle from the origin to a location within the text box with:

    private void FindForm_Paint(object sender, PaintEventArgs e)
    {
        using (Pen pen = new Pen(Color.Blue))
        {
            e.Graphics.DrawRectangle(pen, 0, 0, point.X, point.Y);
        }
    }

问题是，当我运行，绘画是首先进行，然后在文本框中呈现出来，对我行之上。我想文本框被渲染后，绘制线条。

The problem is that when I run, the drawing is done first, and then the text box is rendered, on top of my lines. I want to draw the lines after the text box is rendered.

PS。我没有为与 Form.SetStyle（）函数形式所做的任何设置。

PS. I have not made any settings for the form with the Form.SetStyle() function.

推荐答案

它可以比较棘手的业主画出文本框控件，因为它只是周围的本地Win32 文本框的包装控制。

It can be relatively tricky to owner-draw the TextBox control because it's simply a wrapper around the native Win32 TextBox control.

要捕获您需要处理您的自定义的 WM_PAINT 消息的最简单方法绘画例程的工作是从 的NativeWindow 类。

The easiest way to capture the WM_PAINT messages that you need to handle for your custom painting routines to work is by inheriting from the NativeWindow class.

下面是一个很好的一步一步的文章，说明如何在上下文中做到这一点显示的红色波浪下划线：所有者绘制一个Windows者，恕不文本框

Here is an excellent step-by-step article that shows how to do this in the context of displaying the red wavy underlines: Owner-drawing a Windows.Forms TextBox

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